AU2024200580B2

AU2024200580B2 - Electrophotographic image forming apparatus, developing apparatus, and coupling member

Info

Publication number: AU2024200580B2
Application number: AU2024200580A
Authority: AU
Inventors: Shigeo Miyabe; Masanari Morioka; Takahito Ueno
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2007-03-23
Filing date: 2024-01-31
Publication date: 2025-12-04
Anticipated expiration: 2028-03-24
Also published as: AU2022200676A1; AU2022200676B2; AU2024200580A1

Abstract

ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS, DEVELOPING APPARATUS, AND COUPLING MEMBER An image forming apparatus cartridge comprises: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller configured to remove developer from a surface of the developer roller and to supply developer to the surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable. The coupling member includes (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least two projections that are at least partly outside of the casing, each of the at least two projections being open to the axis L2. The coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position in a direction opposite to the direction the coupling member is inclined when in the second position. ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS, DEVELOPING APPARATUS, AND COUPLING MEMBER

Description

ELECTROPHOTOGRAPHICIMAGE ELECTROPHOTOGRAPHIC IMAGEFORMING FORMINGAPPARATUS, APPARATUS, DEVELOPING APPARATUS, DEVELOPING APPARATUS, AND AND COUPLING COUPLING MEMBER MEMBER [REFERENCETO [REFERENCE TO RELATED RELATEDAPPLICATIONS] APPLICATIONS]

[0001] The

[0001] The present present application application is a is a divisional divisional application application of Australian of Australian Patent Application Patent Application No. No. 2022200676, 2022200676, ininturn turna adivisional divisional application application of of Australian Australian Patent Patent Application No. 2020205222, Application No. 2020205222, a divisional application of Australian Patent Application No. 2018205167, in turn a divisional a divisional application of Australian Patent Application No. 2018205167, in turn a divisional 2024200580

application of Australian application Australian Patent Patent Application Application No. 2017221846 No. 2017221846 filed1 1September filed September 2017. 2017.

Australian Patent Australian Patent Application No.2017221846 Application No. 2017221846is is a divisionalapplication a divisional applicationofofAustralian AustralianPatent Patent Application No. Application No.2016225943 2016225943 filed filed 12 12 September September 2016. 2016. Australian Australian Patent Patent Application Application No. No. 2016225943 2016225943 is is a adivisional divisionalapplication application of of Australian Australian Patent Patent Application Application No. No.2015203402 2015203402 filed filed

19 19 June 2015. Australian June 2015. Australian Patent Patent Application ApplicationNo. No.2015203402 2015203402is ais divisional a divisionalapplication applicationofof Australian Patent Australian Patent Application No.2012200941 Application No. 2012200941 filed filed 1717 February February 2012. 2012. Application Application No. No.

2012200941 2012200941 is is a adivisional divisionalapplication application of of Australian Australian Patent Patent Application Application No. No.2008230339 2008230339 filed filed

24 March 24 March2008. 2008.The The content content of of each each ofof AustralianPatent Australian PatentApplication Application No. No. 2022200676, 2022200676,

Australian Patent Australian Patent Application No.2017221846, Application No. 2017221846, Australian Australian Patent Patent Application Application No.No.

2020205222,Australian 2020205222, AustralianPatent PatentApplication Application No.No. 2016225943, 2016225943, Australian Australian Patent Patent Application Application

No. 2015203402, No. 2015203402, Australian Australian Patent Patent Application Application No.No. 2012200941 2012200941 and Australian and Australian PatentPatent

Application No. Application No.2008230339 2008230339andand Australian Australian Patent Patent Application Application No. No. 2018205167 2018205167 is hereby is hereby

incorporated by reference in its entirety as if fully set forth herein. incorporated by reference in its entirety as if fully set forth herein.

[TECHNICAL FIELD] [TECHNICAL FIELD]

[0002] Thepresent

[0002] The presentinvention inventionrelates relates to to an an electrophotographic imageforming electrophotographic image formingapparatus, apparatus,a a developingapparatus developing apparatusused usedininthe the electrophotographic electrophotographicimage imageforming forming apparatus, apparatus, andand a a coupling member coupling member used used in in theelectrophotographic the electrophotographic image image forming forming apparatus. apparatus.

[0003] Examplesofofthe

[0003] Examples theelectrophotographic electrophotographicimage image forming forming apparatus apparatus include include an an

electrophotographiccopying electrophotographic copyingmachine, machine,an an electrophotographic electrophotographic printer printer (a(a laserbeam laser beamprinter, printer,anan LED printer, etc.), and the like. LED printer, etc.), and the like.

[0004] Thedeveloping

[0004] The developingapparatus apparatus(developing (developing device) device) is is mounted mounted to to a main a main assembly assembly of the of the

electrophotographicimage electrophotographic imageforming forming apparatus apparatus andand develops develops an electrostaticlatent an electrostatic latentimage image formedononananelectrophotographic formed electrophotographicphotosensitive photosensitivemember. member.

[0005] The developing device includes a developing device of a fixed type used in a state in

whichitit is which is mounted and mounted and

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fixed to aa main fixed to mainassembly assembly of of thethe electrophotographic electrophotographic imageimage forming apparatusand forming apparatus anda a developing developing device device of aof a developing developing cartridge typeininwhich cartridge type which a user a user cancan mount mount it the it to to main the main assembly assembly and can demount and can demountititfrom from thethe main main assembly. assembly.

[0006]

[0006] With respect With respect to to the the developing developing device device ofof the the fixed fixed type, type, maintenance maintenance isis performed performed by by a a service service person. Onthe the 2024200580

person. On other hand, other hand,with withrespect respect to to thethe developing developing device device of the of the developing cartridge developing cartridgetype, type, maintenance maintenance is performed is performed by user by the the user by replacing by replacinga adeveloping developing cartridge cartridge withwith another another one. one.

[BACKGROUND ART] [BACKGROUND ART]

[0007]

[0007] In In aa conventional conventionalelectrophotographic electrophotographic imageimage forming forming apparatus, thefollowing apparatus, the following constitution constitution is known is known when when an an electrostatic latent electrostatic latent image image formed formed on on a a drum-shaped drum-shaped electrophotographic photosensitive electrophotographic photosensitive member member (hereinafter (hereinafter referred referred to as to as aa "photosensitive "photosensitive drum") drum") is is developed. developed.

[0008]

[0008] In In aa Japanese JapaneseLaid-Open Laid-Open Patent Patent Application Application (JP-A) (JP-A) 2003-202727, 2003-202727, a agear gear(gear (gear 42Y) 42Y) is is provided provided to ato a developing developing device and is device and isengaged engagedwith with a gear a gear provided provided to ato a main main assembly assembly of of the the image image forming forming apparatus. Then,aarotating apparatus. Then, rotatingforce forceof ofaamotor motor provided to provided to the the main main assembly assembly is is transmitted transmitted to to aa developing developing roller throughthe roller through thegear gear provided provided to to the the mainmain assembly assembly and the and the gear gear provided provided to to the the main main assembly. assembly. In In this this way, way, aa method method of of rotating thedeveloping rotating the developing roller roller is is known. known.

[0009] Further, aa color

[0009] Further, color electrophotographic electrophotographic image image forming forming apparatus inwhich apparatus in whicha adeveloping developing rotary rotary rotatable rotatable in state in state in in which aa plurality which pluralityofofdeveloping developing devices devices is mounted is mounted to the to the developing rotaryisisprovided developing rotary provided to to a main a main assembly assembly of the of the apparatus (JP-AHei apparatus (JP-A Hei11-015265) 11-015265). . In In thisthis apparatus, apparatus, the the following cartridgefor following cartridge for transmitting transmitting a rotating a rotating forceforce from from the the apparatus main apparatus mainassembly assemblyto to thethe developing developing devices devices is known. is known.

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Specifically, Specifically, a amain mainassembly-side assembly-side coupling coupling (coupling (coupling 71) 71) provided to provided tothe theapparatus apparatus main main assembly assembly and and a developing a developing device-sidecoupling device-side coupling(coupling (coupling gear gear 65) 65) of developing of developing devices devices (developing devices6Y, (developing devices 6Y,6M, 6M, 6C)6C) mounted mounted to atodeveloping a developing rotary rotary (multi-color developingdevice (multi-color developing device6) 6) areare connected, connected, whereby whereby a a rotating forceisistransmitted rotating force transmitted from from the the apparatus apparatus main main assembly assembly 2024200580

to to the the developing developing devices. Whenthe devices. When themain mainassembly-side assembly-sidecoupling coupling and the developing and the developingdevice-side device-side coupling coupling are are connected, connected, the main the main assembly-side coupling assembly-side coupling is is once once retracted retracted intointo the apparatus the apparatus (by (by spring 74) SO spring 74) soasasnot nottoto hinder hinder movement movement of the of the developing developing rotary. Then, the rotary. Then, the developing developing rotary rotary is is moved, moved, SO so that that aa predetermineddeveloping predetermined developing device device is is moved moved in ain a direction direction in which in which the the main main assembly-side assembly-side coupling coupling is is provided. Thereafter,the provided. Thereafter, the retracted mainassembly-side retracted main assembly-side coupling coupling is moved is moved toward toward the the developing device-side developing device-side coupling coupling by by using using a moving a moving mechanism mechanism such such as as a a solenoid solenoid and and the the like like (solenoid (solenoid 75, 75, arm arm 76). 76) InIn this this manner, both manner, bothofofthe thecouplings couplings areare connected connected to each to each other. other. Then, aa rotating Then, rotatingforce force of of a motor a motor provided provided to main to the the main assembly assembly is transmittedtotoa adeveloping is transmitted developing roller roller through through the main the main assembly-side coupling assembly-side coupling and and thethe developing developing device-side device-side coupling. coupling. As a As a result, result, the the developing developing roller roller is is rotated. rotated. Such Sucha amethod methodis is known. known.

[0010]

[0010] However, in However, inthe theconventional conventional cartridge cartridge described described in JP-A 2003-202727, in JP-A 2003-202727,a a driving driving connection connection portion portion between between the the main assembly main assembly and and the the developing developing device device constitutes constitutes an an engaging engaging portion for portion for a a gear gear (gear (gear 35) 35) and and a a gear gear (gear (gear 42Y) 42Y).ForFor this this reason, it is reason, it isdifficult difficult to to prevent prevent rotation rotation non-uniformity non-uniformity of of the developingroller. the developing roller.

[0011]

[0011] In the conventional In the conventionalcartridge cartridge described described in JP-A in JP-A Hei Hei 11-015265, asdescribed 11-015265, as described above, above, thethe main main assembly-side assembly-side coupling coupling (coupling 71) is (coupling 71) isonce onceretracted retracted into into thethe apparatus apparatus SO assonot as to not to hinder the hinder the movement movement ofof the the developing developing device. device. Further, Further,during during

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the transmission of the rotating force, it is necessary to move the retracted main assembly-side the transmission of the rotating force, it is necessary to move the retracted main assembly-side

coupling toward coupling towardthe thedeveloping developingdevice-side device-sidecoupling. coupling.Thus, Thus,ititis is necessary necessary to to provide provide aa

mechanism mechanism formoving for moving thethe main main assembly-side assembly-side coupling coupling toward toward the developing the developing device-side device-side to to the apparatus the apparatus main assembly.Further, main assembly. Further,for for image imageformation, formation,a atime timerequired requiredfor for movement movement of of the main the assembly-sidecoupling main assembly-side couplingmust must be be considered. considered.

[SUMMARY

[SUMMARY OFOFTHE THEINVENTION] INVENTION] 2024200580

[0011a]

[0011a] ItItis isananobject objectofofthethepresent present invention invention to substantially to substantially overcome, overcome, or at least or at least

ameliorate, one ameliorate, or more one or disadvantagesofofexisting more disadvantages existing arrangements. arrangements.

[0011b] Oneaspect

[0011b] One aspectofofthe thepresent present disclosure disclosure provides provides an an image imageforming formingapparatus apparatus cartridge cartridge

comprising: a casing; developer contained within the casing; a developer roller having an axis comprising: a casing; developer contained within the casing; a developer roller having an axis

L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis

L1; aa developer L1; supplyingroller developer supplying roller configured to remove configured to developerfrom remove developer from a surfaceofofthe a surface the developer roller and to supply developer to the surface of the developer roller; and a coupling developer roller and to supply developer to the surface of the developer roller; and a coupling

memberhaving member having an an axis axis L2L2 about about which which the the coupling coupling member member is rotatable, is rotatable, the the coupling coupling member member

including (i) a first end portion operatively connected to the developer roller and the developer including (i) a first end portion operatively connected to the developer roller and the developer

supplying roller and (ii) a second end portion for receiving a rotational force, the second end supplying roller and (ii) a second end portion for receiving a rotational force, the second end

portion including at least two projections that are at least partly outside of the casing, each of portion including at least two projections that are at least partly outside of the casing, each of

the at the at least leasttwo twoprojections projectionsbeing beingopen open to tothe theaxis axisL2, L2,wherein whereinthe thecoupling couplingmember is movable member is movable

between (i) a first position in which the axis L2 of the coupling member is substantially parallel between (i) a first position in which the axis L2 of the coupling member is substantially parallel

to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis

L2 of L2 of the the coupling member coupling member is isinclined inclinedwith withrespect respecttoto the the position position of of the the axis axisL2 L2 when the when the

coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is in the first position, and (iii) a third position in which the axis L2 of the

coupling member coupling member is is inclinedwith inclined withrespect respecttoto the the position position of the the axis axisL2 L2 when the coupling when the coupling member is in the first position in a direction opposite to the direction the coupling member is member is in the first position in a direction opposite to the direction the coupling member is

inclined when inclined in the when in the second secondposition. position.

[0011c] Anotheraspect

[0011c] Another aspectofofthe the present present disclosure disclosure provides provides an an image imageforming formingapparatus apparatuscartridge cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis comprising: a casing; developer contained within the casing; a developer roller having an axis

L1; aa developer L1; supplyingroller developer supplying roller configured to remove configured to developerfrom remove developer from thesurface the surfaceofofthe the developer roller and to supplying developer to a surface of the developer roller; and a coupling developer roller and to supplying developer to a surface of the developer roller; and a coupling

member member having having an an axis axis L2L2 about about which which the the coupling coupling member member is rotatable, is rotatable, the the coupling coupling member member

supplying rollerandand supplying roller (ii)a asecond (ii) second end end portion portion for receiving for receiving a rotational a rotational force, force, the theend second second end portion including at least two projections that are at least partly outside of the casing, each of portion including at least two projections that are at least partly outside of the casing, each of

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to and offset from the axis L1 of the developer roller and (ii) a second position in which the to and offset from the axis L1 of the developer roller and (ii) a second position in which the

axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the

coupling member is in the first position. coupling member is in the first position.

[0011d] Another

[0011d] Anotheraspect aspectofofthe thepresent present disclosure disclosure provides provides an an image imageforming formingapparatus apparatus 2024200580

cartridge comprising: a casing; developer contained within the casing; a developer roller having cartridge comprising: a casing; developer contained within the casing; a developer roller having

an axis L1, the developer roller being rotatably supported in the casing to permit rotation about an axis L1, the developer roller being rotatably supported in the casing to permit rotation about

the axis the axis L1; L1; aa developer developer supplying roller configured supplying roller configured to to remove developerfrom remove developer froma asurface surfaceofofthe the developer roller and to supply developer to the surface of the developer roller; and a coupling developer roller and to supply developer to the surface of the developer roller; and a coupling

supplying rollerandand supplying roller (ii)a asecond (ii) second end end portion portion for receiving for receiving a rotational a rotational force, force, the theend second second end portion including at least one projection that is at least partly outside of the casing, the at least portion including at least one projection that is at least partly outside of the casing, the at least

one projection one projection being being open opentoto the the axis axis L2, L2, wherein the coupling wherein the coupling member member is is movable movable between between (i) (i) a first position in which the axis L2 of the coupling member is substantially parallel to and a first position in which the axis L2 of the coupling member is substantially parallel to and

offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the

coupling member coupling member is is inclinedwith inclined withrespect respecttotothe the position position of the the axis axisL2 L2 when the coupling when the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling

member member isisinclined inclinedwith withrespect respectto to the the position position of of the theaxis axisL2 L2when the coupling when the member coupling member isisinin

the first position in a direction opposite to the direction the coupling member is inclined when the first position in a direction opposite to the direction the coupling member is inclined when

in the second position. in the second position.

[0011e] Anotheraspect

[0011e] Another aspectofofthe the present present disclosure disclosure provides provides an an image imageforming formingapparatus apparatus cartridge cartridge

portion including at least one projection that is at least partly outside of the casing, the at least portion including at least one projection that is at least partly outside of the casing, the at least

one projection one projection being being open opento to the the axis axis L2, L2, wherein the coupling wherein the member coupling member is ismovable movable between between (i) (i) a first position in which the axis L2 of the coupling member is substantially parallel to and a first position in which the axis L2 of the coupling member is substantially parallel to and

offset from the axis L1 of the developer roller and (ii) a second position in which the axis L2 of offset from the axis L1 of the developer roller and (ii) a second position in which the axis L2 of

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the coupling the member coupling member isisinclined inclinedwith withrespect respectto to the the position position of of the the axis axisL2 L2 when the coupling when the coupling

member is in the first position. member is in the first position.

[0011f] Oneaspect

[0011f] One aspectofof the the present present disclosure disclosure provides provides an an image formingapparatus image forming apparatuscartridge cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis comprising: a casing; developer contained within the casing; a developer roller having an axis

L1; a developer supplying roller contacting the developer roller and configured to supply L1; a developer supplying roller contacting the developer roller and configured to supply 2024200580

developer to developer to aa surface of of the thedeveloper developer roller; roller;and anda acoupling couplingmember havingananaxis member having axis L2 L2about about whichthe which the coupling couplingmember memberis is rotatable,the rotatable, thecoupling couplingmember member including including (i)(i) a a first end first end portion portion operatively connected to the developer roller and the developer supplying roller and (ii) a operatively connected to the developer roller and the developer supplying roller and (ii) a

second end portion for receiving a rotational force, the second end portion including at least second end portion for receiving a rotational force, the second end portion including at least

two projections that are at least partly outside of the casing, each of the at least two projections two projections that are at least partly outside of the casing, each of the at least two projections

being open being opento to the the axis axis L2, L2, wherein the coupling wherein the coupling member member is is movable movable between between (i) (i) a firstposition a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis in which the axis L2 of the coupling member is substantially parallel to and offset from the axis

L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first inclined with respect to the position of the axis L2 when the coupling member is in the first

position, and (iii) a third position in which the axis L2 of the coupling member is inclined with position, and (iii) a third position in which the axis L2 of the coupling member is inclined with

respect to the position of the axis L2 when the coupling member is in the first position in a respect to the position of the axis L2 when the coupling member is in the first position in a

direction opposite to the direction the coupling member is inclined when in the second position. direction opposite to the direction the coupling member is inclined when in the second position.

[0011g] Another

[0011g] Anotheraspect aspectofofthe thepresent present disclosure disclosure provides provides an an image imageforming formingapparatus apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having cartridge comprising: a casing; developer contained within the casing; a developer roller having

the axis L1; a developer supplying roller contacting the developer roller and configured to the axis L1; a developer supplying roller contacting the developer roller and configured to

supply developer supply developertoto aa surface surface of the the developer developer roller; roller;and anda acoupling couplingmember havingananaxis member having axisL2L2 about which about whichthe thecoupling couplingmember memberis is rotatable,the rotatable, thecoupling couplingmember member including including (i) (i) a first end a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) portion operatively connected to the developer roller and the developer supplying roller and (ii)

a second end portion for receiving a rotational force, the second end portion including at least a second end portion for receiving a rotational force, the second end portion including at least

being open being opento to the the axis L2, L2, wherein the coupling wherein the coupling member member is is movable movable between between (i) (i) a firstposition a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis in which the axis L2 of the coupling member is substantially parallel to and offset from the axis

L1 of the developer roller and (ii) a second position in which the axis L2 of the coupling L1 of the developer roller and (ii) a second position in which the axis L2 of the coupling

member member isisinclined inclinedwith withrespect respectto to the the position of of the theaxis axisL2 L2when the coupling when the member coupling member isisinin

the first position. the first position.

[0011h] Another

[0011h] Anotheraspect aspectofofthe thepresent present disclosure disclosure provides provides an an image imageforming formingapparatus apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having cartridge comprising: a casing; developer contained within the casing; a developer roller having

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supply developer supply developertoto aa surface surface of of the the developer developer roller; roller;and anda acoupling couplingmember havingananaxis member having axisL2L2 about which about whichthe thecoupling couplingmember memberis is rotatable,the rotatable, thecoupling couplingmember member including including (i)(i) a first end a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) portion operatively connected to the developer roller and the developer supplying roller and (ii)

a second end portion for receiving a rotational force, the second end portion including at least a second end portion for receiving a rotational force, the second end portion including at least 2024200580

one projection that is at least partly outside of the casing, the at least one projection being open one projection that is at least partly outside of the casing, the at least one projection being open

to the to the axis axisL2, L2,wherein wherein the the coupling coupling member member isismovable movable between between (i)(i) a first position a first position in in which which

the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of

the developer roller, (ii) a second position in which the axis L2 of the coupling member is the developer roller, (ii) a second position in which the axis L2 of the coupling member is

inclined with respect to the position of the axis L2 when the coupling member is in the first inclined with respect to the position of the axis L2 when the coupling member is in the first

[0011i]

[0011i] Another aspectof Another aspect of the the present present disclosure disclosure provides provides an an image formingapparatus image forming apparatuscartridge cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis comprising: a casing; developer contained within the casing; a developer roller having an axis

L1; a developer supplying roller contacting a surface of the developer roller and configured to L1; a developer supplying roller contacting a surface of the developer roller and configured to

supply developer supply developertoto the the surface surface of of the the developer developer roller; roller;and anda acoupling couplingmember havingananaxis member having axis L2 about L2 aboutwhich whichthe thecoupling couplingmember member is rotatable,the is rotatable, thecoupling couplingmember member including including (i) (i) a firstend a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) portion operatively connected to the developer roller and the developer supplying roller and (ii)

to the to the axis axisL2, L2,and and wherein wherein the the coupling coupling member member isismovable movable between between (i) (i) a firstposition a first position in in which the axis L2 of the coupling member is substantially parallel to and offset from the axis which the axis L2 of the coupling member is substantially parallel to and offset from the axis

memberisisinclined member inclinedwith withrespect respectto to the the position position of of the theaxis axisL2 L2when the coupling when the member coupling member isisinin

the first position. the first position.

[0012] Disclosedis

[0012] Disclosed is aa developing apparatus(developing developing apparatus (developingcartridge) cartridge)which whichseeks seekstotoaddress, address,or or at at least ameliorate, the above-described problems of the conventional cartridges, an least ameliorate, the above-described problems of the conventional cartridges, an

electrophotographicimage electrophotographic imageforming forming apparatus apparatus using using thethe developing developing apparatus, apparatus, andand a coupling a coupling

member member used used in in thedeveloping the developing apparatus. apparatus.

[0013] Alsodisclosed

[0013] Also disclosed is is aa developing apparatus (developing developing apparatus (developingcartridge) cartridge) capable capableof of engaging engaginga a coupling member coupling member provided provided to to thethe developing developing apparatus apparatus (developing (developing cartridge) cartridge) with with a driving a driving

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shaft by moving the developing apparatus in a direction substantially perpendicular to an axial shaft by moving the developing apparatus in a direction substantially perpendicular to an axial

direction of the driving shaft even in the case where a main assembly is not provided with a direction of the driving shaft even in the case where a main assembly is not provided with a

mechanism mechanism formoving for moving a main a main assembly-side assembly-side coupling coupling member member in the in the axial axial direction direction by a by a solenoid. Also solenoid. disclosed is Also disclosed is an an electrophotographic imageforming electrophotographic image formingapparatus apparatususing usingthe the developingapparatus developing apparatusand andthe thecoupling couplingmember member used used in the in the developing developing apparatus. apparatus.

[0014] Also

[0014] Alsodisclosed disclosedis is a developing apparatus (developing developing apparatus (developingcartridge) cartridge) capable capableof of 2024200580

engagingaadriving engaging driving shaft shaft

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provided to provided toa amain mainassembly assembly of of an an electrophotographic electrophotographic imageimage forming apparatusfrom forming apparatus from a direction a direction substantially substantially perpendicular perpendicular to to an an axial axial direction direction of of the the driving driving shaft. Alsodisclosed shaft. Also disclosedis is an electrophotographic an electrophotographic image image forming forming apparatus apparatus usingusing the the developing apparatusand developing apparatus and a coupling a coupling member member usedused in the in the developing apparatus. developing apparatus. 2024200580

[0015]

[0015] Also disclosed Also disclosedisisa adeveloping developing apparatus apparatus (developing cartridge)capable (developing cartridge) capable of of smoothly smoothly rotating rotating a developing a developing roller comparedwith roller compared withthe the case case where where driving driving connection connection of a of maina main assembly and assembly andthe thedeveloping developing apparatus apparatus is performed is performed through through gears. Also gears. Alsodisclosed disclosedisisan anelectrophotographic electrophotographicimage imageforming forming apparatus usingthe apparatus using thedeveloping developing apparatus apparatus and and a coupling a coupling member member used in used in the thedeveloping developing apparatus. apparatus.

[0016]

[0016] Also disclosed Also disclosedisisa adeveloping developing apparatus apparatus (developing cartridge)capable (developing cartridge) capable of of engaging engaging withwith a driving a driving shaftshaft provided to provided toa amain mainassembly assembly of of an an electrophotographic electrophotographic imageimage forming apparatusfrom forming apparatus froma a direction direction substantially substantially perpendicular perpendicular to an axial to an axialdirection directionofof thethe driving driving shaft shaft and and capable capable of of smoothly smoothly rotating rotating aa developing developing roller. Also disclosed roller. Also disclosed is is an an electrophotographic image electrophotographic image forming forming apparatus apparatus using using the developing the developing apparatus and apparatus anda acoupling coupling member member used used in the in the developing developing apparatus. apparatus.

[0017]

[0017] Also disclosed Also disclosedisisa adeveloping developing apparatus apparatus capable capable of mountingwith of mounting withand anddemounting demounting from from a driving a driving shaftshaft provided provided to to a main assembly a main assemblyofofananelectrophotographic electrophotographic image image forming forming apparatus froma adirection apparatus from direction substantially substantially perpendicular perpendicular to anto an axial directionofofthe axial direction the driving driving shaft shaft by movement by movement of a of a moving moving member in member in one one direction. direction. Also Alsodisclosed disclosedisisan an electrophotographic image electrophotographic image forming forming apparatus apparatus using using the developing the developing apparatus and apparatus anda acoupling coupling member member usedused in the in the developing developing apparatus. apparatus.

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[0018]

[0018] Also disclosed Also disclosedisisa adeveloping developing apparatus apparatus capable capable of mountingwith of mounting withand anddemounting demounting from from a driving a driving shaftshaft provided to provided to a main assembly a main assemblyofofananelectrophotographic electrophotographic image image forming forming apparatus from apparatus froma adirection direction substantially substantially perpendicular perpendicular to anto an axial directionofofthe axial direction the driving driving shaft shaft by movement by movement of a of a moving moving member in member in one one direction direction and and capable capable of of smoothly smoothly rotating rotating a a 2024200580

developing developing roller. Alsodisclosed roller. Also disclosedisisan anelectrophotographic electrophotographic image formingapparatus image forming apparatus using using thethe developing developing apparatus apparatus and aand a coupling memberused coupling member usedinin the the developing developing apparatus. apparatus.

[0019]

[0019] Also disclosed Also disclosedisisa adeveloping developing apparatus apparatus including including a coupling member a coupling membercapable capable of of taking taking a rotating a rotating forceforce transmitting angularposition transmitting angular positionforfor transmitting transmitting a rotating a rotating force force from from aa main main assembly assemblyofof an an electrophotographic electrophotographic imageimage forming forming apparatus to apparatus toa adeveloping developing roller, roller, a pre-engagement a pre-engagement angular angular position at position atwhich whichthe the coupling coupling member member is inclined is inclined from from the the rotating forcetransmitting rotating force transmitting angular angular position position andinisa in and is a state state before being before being engaged engaged with with a a rotating rotating force force applying applying portion, portion, and and a disengagementangular a disengagement angular position position at at which which the the coupling coupling member member is is inclined fromthe inclined from therotating rotating force force transmitting transmitting angular angular position position in in aa direction directionopposite opposite from from thethe pre-engagement pre-engagement angular angular position position to to be be disengaged disengaged from from the the driving driving shaft. Alsodisclosed shaft. Also disclosedisisan an electrophotographic image electrophotographic image forming forming apparatus apparatus using using the developing the developing apparatus and apparatus andthe thecoupling coupling member member used used in the in the developing developing apparatus. apparatus.

[0020]

[0020] According to According toone oneaspect aspect of of thethe present present disclosure, disclosure, there is provided there is provideda adeveloping developing apparatus apparatus capable capable of engaging of engaging a a coupling memberprovided coupling member providedto to thethe developing developing apparatus apparatus (developing (developing cartridge) witha adriving cartridge) with driving shaft shaft by by moving moving the the developing developing apparatus (developing apparatus (developing cartridge) cartridge) indirection in a a direction substantially substantially perpendiculartotoananaxial perpendicular axial direction direction of the of the driving driving shaftshaft even in even in the the case case where where a a main main assembly assembly is is not not provided provided with with aa mechanism mechanism for for moving aamain moving mainassembly-side assembly-side coupling coupling member member in axial in the the axial

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7 31 Jan 2024

direction by direction by a a solenoid. solenoid. According Accordingtotoanother anotheraspect aspectofofthe the present disclosure, present disclosure,there there is is provided provided an electrophotographic an electrophotographic image formingapparatus image forming apparatus using using thethe developing developing apparatus apparatus and the and the coupling memberused coupling member usedinin the the developing developing apparatus. apparatus.

[0021]

[0021] According to According toanother another aspect aspect of of thethe present present disclosure,there thereisisprovided provided a developing apparatus capable of 2024200580

disclosure, a developing apparatus capable of engaging engaging aa driving drivingshaft shaft provided provided tomain to a a main assembly assembly of anof an electrophotographic image electrophotographic image forming forming apparatus apparatus fromfrom a direction a direction substantially perpendicular substantially perpendicular to to an an axial axial direction direction of driving of the the driving shaft. Accordingto shaft. According toanother anotheraspect, aspect,there thereisisprovided providedthe the electrophotographic image electrophotographic image forming forming apparatus apparatus using using the developing the developing apparatus and apparatus anda acoupling coupling member member used used in the in the developing developing apparatus. apparatus.

[0022]

[0022] According to According toanother another aspect aspect of of thethe present present disclosure, itisispossible disclosure, it possible to to smoothly smoothly rotate rotate a developing a developing roller comparedwith roller compared withthe the case case where where driving driving connection connection of anof an apparatus mainassembly apparatus main assemblyandand thethe developing developing apparatus apparatus is is performed through performed throughgears. gears.

[0023]

[0023] According to According toanother anotheraspect aspect of of thethe present present disclosure,there disclosure, thereisisprovided provided a developing a developing apparatus apparatus capable capable of of engaging with engaging witha adriving driving shaft shaft provided provided to atomain a main assembly assembly of an of an electrophotographic image electrophotographic image forming forming apparatus apparatus fromfrom a direction a direction substantially perpendicular substantially perpendicular to to an an axial axial direction direction of driving of the the driving shaft and capable shaft and capableofofsmoothly smoothly rotating rotating a developing a developing roller. roller. According to According toanother anotheraspect aspect of of thethe present present disclosure, disclosure, there there is is provided an provided anelectrophotographic electrophotographic image image forming forming apparatus apparatus using using the developingapparatus the developing apparatusandand a coupling a coupling member member used used in the in the developing apparatus. developing apparatus.

[0024]

[0024] According to According toanother another aspect aspect of of thethe present present disclosure, thereisisprovided disclosure, there provided a developing a developing apparatus apparatus capable capable of of mounting with mounting withand anddemounting demounting from from a driving a driving shaft shaft provided provided to to

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8 31 Jan 2024

the apparatusmain the apparatus mainassembly assembly from from a direction a direction substantially substantially perpendiculartotoananaxial perpendicular axial direction direction of the of the driving driving shaftshaft by by movement of movement of a a moving moving member member in in one one direction. direction. According Accordingto to another aspect,ititisisalso another aspect, also possible possible to provide to provide an an electrophotographicimage electrophotographic image forming forming apparatus apparatus using using the developing the developing apparatus anda acoupling apparatus and coupling member member used used in the in the developing developing 2024200580

apparatus. apparatus.

[0025]

[0025] According to According toanother anotheraspect aspect of of thethe present present disclosure, thereisisprovided disclosure, there provided a developing a developing apparatus apparatus capable capable of of mounting with mounting withand anddemounting demounting from from a driving a driving shaft shaft provided provided to to the apparatusmain the apparatus mainassembly assembly from from a direction a direction substantially substantially perpendiculartotoananaxial perpendicular axial direction direction of the of the driving driving shaftshaft by by movement of movement ofa amoving moving member member in in oneone direction direction and capable and capable of of smoothly smoothly rotating rotating a a developing developing roller. According to roller. According to another another aspect of aspect of the thepresent present disclosure, disclosure, there there is provided is provided an an electrophotographic image electrophotographic image forming forming apparatus apparatus using using the developing the developing apparatus and apparatus anda acoupling coupling member member used used in the in the developing developing apparatus. apparatus.

[0026]

[0026] According to According toanother another aspect aspect of of thethe present present disclosure,there disclosure, thereisisprovided provided a developing a developing apparatus apparatus including including a a coupling membercapable coupling member capableof of taking taking a rotating a rotating force force transmitting transmitting angular positionfor angular position fortransmitting transmitting a rotating a rotating force force from from the the apparatus mainassembly apparatus main assemblyto to a developing a developing roller, roller, a pre-engagement a pre-engagement angular positionatatwhich angular position which thethe coupling coupling member member is inclined is inclined from from the rotatingforce the rotating forcetransmitting transmitting angular angular position position andinis and is a in a state beforebeing state before beingengaged engaged with with a rotating a rotating force force applying applying portion, and portion, anda adisengagement disengagement angular angular position position at which at which the the coupling memberisisinclined coupling member inclined from from thethe rotating rotating force force transmitting transmitting angular positioninina adirection angular position direction opposite opposite fromfrom the pre-engagement the pre-engagement angular positiontotobebe angular position disengaged disengaged from from the the driving driving shaft. shaft.

[0027]

[0027] According to According toanother anotheraspect aspect of of thethe present present disclosure, itisispossible disclosure, it possible to to engage engage and and disengage disengage a coupling a coupling

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member provided member provided to to aa developing developing apparatus apparatus with with respect respect to to a a driving shaft driving shaftprovided providedto to an an apparatus apparatus mainmain assembly assembly from from a a direction substantially direction substantially perpendicular perpendicular to axial to an an axial direction direction of of the drivingshaft the driving shaftbybymovement movement of of a moving a moving member member in one in one direction. direction.

[0028] According to toanother another aspect of of thethe present 2024200580

[0028] According aspect present disclosure,ititisispossible disclosure, possible to to engage engage and and disengage disengage a coupling a coupling member provided member provided to to aa developing developing apparatus apparatus with with respect respect to to a a driving shaft driving shaftprovided providedto to an an apparatus apparatus mainmain assembly assembly from from a a direction substantially direction substantially perpendicular perpendicular to axial to an an axial direction direction of of the drivingshaft the driving shaftbybymovement movement of of a moving a moving member member in one in one direction and direction andalso alsopossible possibleto to smoothly smoothly rotate rotate a developing a developing roller. roller.

[0029]

[0029] According to According to another another aspect aspect of of the the present present disclosure,even disclosure, evenwhen when a main a main assembly assembly is not is not provided provided with with a a mechanism for mechanism for moving moving aa main main assembly-side assembly-side coupling coupling member member for for transmitting transmitting a arotational rotational force force to to a developing a developing roller roller in anin an axial directionofofthe axial direction the coupling coupling member member by abysolenoid, a solenoid, it isit is possible to possible toengage engagea acoupling coupling member member provided provided to a to a developing developing apparatus witha adriving apparatus with driving shaft shaft by by movement movement of aof a moving moving member. member. According to According toanother another aspect aspect of of thethe present present disclosure, disclosure, it is it is possible to possible torealize realizeanan improvement improvement in image in image forming forming speed. speed.

[0029a] Accordingtotoanother

[0029a] According anotheraspect aspectofofthe thepresent presentdisclosure, disclosure, there is provided there is providedananimage image forming forming apparatus apparatus comprising: comprising: a a driving shaft; driving shaft;a asupporting supporting member member capable capable of linearly of linearly moving moving in in a directionsubstantially a direction substantially perpendicular perpendicular to axis to an an axis of said of said driving shaft; driving shaft;a acartridge cartridge dismountably dismountably mounted mounted on said on said supporting member;a arotatable supporting member; rotatable member member provided provided in said in said cartridge, cartridge, aacoupling couplingwhich which is is provided provided in said in said cartridge cartridge and and which is which is engaged engagedwith with said said driving driving shaft shaft and and transmits transmits a driving a driving force receivedfrom force received fromsaid said driving driving shaft shaft to said to said rotatable rotatable member; member; and whereinlinear and wherein linearmovement movement of of thethe supporting supporting member member causes causes said said

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coupling to move coupling to movebetween between a first a first position position in which in which an axis an axis of of the couplingisissubstantially the coupling substantially parallel parallel to the to the axis axis of the of the driving shaft driving shaft and and aa second second position position inin which which the the axis axis of of said said coupling is inclined coupling is inclinedrelative relativeto to thethe axisaxis of said of said driving driving shaft.shaft.

[0029b] Accordingtotoanother

[0029b] According anotheraspect aspectofofthe thepresent presentdisclosure, disclosure, there is provided there is provideda acartridge cartridge dismountably dismountably mount mount double double to an to an 2024200580

image formingapparatus image forming apparatus including including a driving a driving shaft, shaft, and aand a supporting membercapable supporting member capable of of linearly linearly moving moving in ain a direction direction substantially perpendicular substantially perpendicular to to an an axis axis of said of said driving driving shaft, shaft, said cartridgecomprising: said cartridge comprising: a cartridge a cartridge dismountably dismountably mounted mounted on on the supportingmember; the supporting member; a rotatable a rotatable member member provided provided in said in said cartridge, cartridge, aacoupling couplingwhich which is is provided provided in said in said cartridge cartridge and and which is which is engaged engaged with with the the driving driving shaft shaft and and transmits transmits aa driving driving force receivedfrom force received fromthe the driving driving shaft shaft to said to said rotatable rotatable member; member; and whereinlinear and wherein linearmovement movementof of thethe supporting supporting member member causes causes said said coupling to move coupling to movebetween between a first a first position position in which in which an axis an axis of of the couplingisissubstantially the coupling substantially parallel parallel to the to the axis axis of the of the driving shaftand driving shaft anda asecond second position position in which in which the axis the axis of the of the coupling is inclined coupling is inclinedrelative relative to to thethe axisaxis of driving of the the driving shaft. shaft.

[0030] According

[0030] According to to another another aspect aspect of of thethe present present disclosure, disclosure, there is provided there is providedananimage image forming forming apparatus apparatus comprising: comprising: a a driving shaft,a asupporting driving shaft, supporting member member capable capable of linearly of linearly moving moving in in a directionsubstantially a direction substantially perpendicular perpendicular to the to the axis axis of the of the driving shaft, driving shaft,wherein wherein said said supporting supporting member member supports supports (i) a(i) a plurality of plurality ofrotatable rotatable members members andand (ii)(ii) a plurality a plurality of couplings of couplings engaged with engaged withsaid saiddriving driving shaft shaft to to transmit transmit a driving a driving forceforce received fromsaid received from saiddriving driving shaft shaft to to saidsaid rotatable rotatable members, members, respectively, whereineach respectively, wherein each of of said said couplings couplings is movable is movable by by linear movementofofsaid linear movement said supporting supporting member member between between a first a first position in position inwhich whichaxes axes of of said said couplings couplings are are substantially substantially parallel to parallel toananaxis axisofof said said driving driving shaft shaft a second a second position position in in which the which the axes axesofofsaid said couplings couplings are are inclined inclined relative relative to the to the axis of said axis of saiddriving drivingshaft. shaft.

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[0031] These and

[0031] These andother otherobjects, objects, features features and and advantages advantages of the of the present invention present invention will will become become more more apparent apparent upon upon a a consideration consideration of the of the following followingdescription description of of thethe preferred preferred embodiments embodiments of theof the present invention present invention taken taken in in conjunction conjunction with with the the accompanying accompanying drawings. drawings.

[BRIEF DESCRIPTIONOFOFTHE

[BRIEF DESCRIPTION THE DRAWINGS] DRAWINGS] 2024200580

[0032] Figure 11isisa aside

[0032] Figure side sectional sectional view view of aofdeveloping a developing cartridge accordingtoto cartridge according an an embodiment embodiment of the of the present present invention. invention.

[0033] Figure 22isisa aperspective

[0033] Figure perspective view view of the of the developing developing cartridge accordingtoto cartridge according the the embodiment embodiment of the of the present present invention. invention.

[0034] Figure 33isisa aperspective

[0034] Figure perspective view view of the of the developing developing cartridge accordingtoto cartridge according the the embodiment embodiment of the of the present present invention. invention.

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[0035]

[0035] Figure 44 is Figure isa aside sidesectional sectional view view ofmain of a a main assembly ofan assembly of anelectrophotographic electrophotographic image image forming forming apparatus apparatus according toananembodiment according to embodimentof of thethe present present invention. invention.

[0036]

[0036] Figure 55 is Figure isa aperspective perspective view view of of a developing a developing rolleraccording 5 roller 5 accordingtotoananembodiment embodimentofofthe thepresent presentinvention. invention. 2024200580

[0037]

[0037] Figure Figure 66 is isa aperspective perspective view view andand a a longitudinal sectional longitudinal sectional view view of of a coupling a coupling according according to anto an embodiment of embodiment ofthe thepresent present invention. invention.

[0038]

[0038] Figure Figure 77 is isa aperspective perspective view view of of a development a development 10 10 supporting memberaccording supporting member according to to an an embodiment embodiment of present of the the present invention. invention.

[0039]

[0039] Figure 88 is Figure isa aperspective perspective view view of of a coupling a coupling according toananembodiment according to embodimentof of thethe present present invention. invention.

[0040]

[0040] Figure Figure 99 is isa asectional sectional view view of of a side a side of the of the 15 15 developing cartridge developing cartridgeaccording according to to an embodiment an embodiment of present of the the present invention. invention.

[0041]

[0041] Figure 10 Figure 10 is isananexploded exploded view view of of a coupling a coupling member according member accordingtotoanan embodiment embodiment of the of the present present invention. invention.

[0042]

[0042] Figure 11 is Figure 11 isa alongitudinal longitudinal sectional sectional viewview of of 20 20 the developingcartridge the developing cartridge according according to embodiment to an an embodiment of the of the present invention. present invention.

[0043]

[0043] Figure 12 Figure 12 is isa alongitudinal longitudinal sectional sectional viewview of of the developingcartridge the developing cartridge according according to the to the embodiment embodiment of the of the present invention. present invention.

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[0044]

[0044] Figure 13 Figure 13 is isa alongitudinal longitudinal sectional sectional viewview of of the developingcartridge the developing cartridge according according to the to the embodiment embodiment of the of the present invention. present invention.

[0045]

[0045] Figure 14 Figure 14 is isa aperspective perspective view view of of a coupling a coupling 5 5 according to according tothe theembodiment embodiment of of thethe present present invention. invention. 2024200580

[0046]

[0046] Figure 15 is Figure 15 isa aperspective perspective view view of of a rotary a rotary member (hereinafter member (hereinafter called called "rotary") "rotary") according according to to the the embodiment ofthe embodiment of thepresent present invention. invention.

[0047]

[0047] Figure 16 Figure 16 is isa aperspective perspective view view of of the the rotary rotary 10 10 according tothe according to theembodiment embodiment of of thethe present present invention. invention.

[0048]

[0048] Figure 17 Figure 17 is isa aperspective perspective view view of of the the rotary rotary according tothe according to theembodiment embodiment of of thethe present present invention. invention.

[0049]

[0049] Figure 18 Figure 18 shows showsa aview, view, as as seen seen from from a side, a side, of of an apparatus an apparatusmain mainassembly assembly according according to embodiment to an an embodiment of the of the 15 15 present invention. present invention.

[0050]

[0050] Figure 19 shows Figure 19 showsa aview view of of thethe apparatus apparatus mainmain assembly accordingtotothe assembly according the embodiment embodiment of the of the present present invention, invention, as seen as seen from froma aside. side.

[0051]

[0051] Figure 20 shows Figure 20 showsa aview view of of thethe apparatus apparatus mainmain 20 20 assembly accordingtotothe assembly according the embodiment embodiment of the of the present present invention, invention, as seen as seen from fromthe theside. side.

[0052]

[0052] Figure 21 Figure 21 is isthe theFigure Figure of of thethe apparatus apparatus mainmain assembly accordingtotothe assembly according the embodiment embodiment of the of the present present invention, invention, as seen as seen from fromthe theside. side.

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[0053]

[0053] Figure 22 Figure 22 is isa alongitudinal longitudinal sectional sectional viewview showing the process showing the processofof engagement engagement between between the the drive drive shaftshaft and and the couplingaccording the coupling accordingto to an an embodiment embodiment of the of the present present invention. invention.

5 5 [0054]

[0054] Figure 23 Figure 23 is isananexploded exploded perspective perspective viewview of the of the 2024200580

drive shaft drive shaftand andthe thecoupling coupling according according to the to the embodiment embodiment of of the presentinvention. the present invention.

[0055]

[0055] Figure 24 Figure 24 is isananexploded exploded perspective perspective viewview of the of the drive shaft drive shaftand andthe thecoupling coupling according according to the to the embodiment embodiment of of 10 10 the presentinvention. the present invention.

[0056]

[0056] Figure 25 is Figure 25 isa aperspective perspective view view showing showing the the process of process ofdisengagement disengagementof of thethe coupling coupling fromfrom drivedrive shaftshaft according tothe according to theembodiment embodimentof of thethe present present invention. invention.

[0057]

[0057] Figure 26 is Figure 26 isthe thetiming timing chart chart of of thethe operations operations 15 15 ofan of anembodiment embodimentof ofthe thepresent presentinvention. invention.

[0058]

[0058] Figure 27 Figure 27 is isa aperspective perspective view view of of a coupling a coupling according toananembodiment according to embodimentof of thethe present present invention. invention.

[0059]

[0059] Figure 28 Figure 28 is isa aperspective perspective view view of of the the coupling coupling according tothe according to theembodiment embodimentof of thethe present present invention. invention.

20 20 [0060]

[0060] Figure 29 Figure 29 is isa aperspective perspective view view of of a drive a drive shaft shaft according toananembodiment according to embodimentof of thethe present present invention. invention.

[0061]

[0061] Figure 30 is Figure 30 isa aperspective perspective view view of of a coupling a coupling according tothe according to theembodiment embodimentof of thethe present present invention. invention.

[0062]

[0062] Figure 31 is Figure 31 isa aperspective perspective view view of of the the coupling coupling 25 25 according tothe according to theembodiment embodimentof of thethe present present invention. invention.

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[0063]

[0063] Figure 32 Figure 32 is isa aperspective perspective view view of of a side a side of aof a developingcartridge developing cartridgeaccording according to to an embodiment an embodiment of present of the the present invention. invention.

[0064]

[0064] Figure 33 Figure 33 is isa apartly partly sectional sectional view view of the of the 5 5 developingcartridge developing cartridgeand and a development a development shaft shaft according according to the to the 2024200580

embodiment of embodiment ofthe thepresent present invention. invention.

[0065]

[0065] Figure 34 Figure 34 is isa alongitudinal longitudinal sectional sectional viewview illustrating thetake-out illustrating the take-out process process of the of the developing developing cartridge cartridge according tothe according to theembodiment embodiment of of thethe present present invention. invention.

10 [0066] 10 [0066] Figure 35 Figure 35 is isa alongitudinal longitudinal sectional sectional viewview illustrating theprocess illustrating the process of of engagement engagement between between the drive the drive shaft shaft and the and the coupling couplingaccording according to to thethe embodiment embodiment of present of the the present invention. invention.

[0067]

[0067] Figure 36 Figure 36 is isa aperspective perspective view view of of a development a development 15 15 supporting member supporting memberaccording according to to an an embodiment embodiment of present of the the present invention. invention.

[0068]

[0068] Figure 37 Figure 37 is isa aperspective perspective view view of of a side a side of aof a developing cartridge developing cartridgeaccording according to to an embodiment an embodiment of present of the the present invention. invention.

20 20 [0069]

[0069] Figure 38 Figure 38 is isa aperspective perspective view view illustrating illustrating the the state of the state of theengagement engagement between between thethe drive drive shaft shaft and the and the coupling accordingtotothe coupling according the embodiment embodiment of the of the present present invention, invention, and aa longitudinal and longitudinalsectional sectional view. view.

[0070]

[0070] Figure 39 Figure 39 is isa aperspective perspective view view of of a development a development supportingmember 25 supporting 25 memberaccording accordingtotothe theembodiment embodimentofofthe thepresent present invention. invention.

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[0071]

[0071] Figure 40 is Figure 40 isa aperspective perspective view view of of a coupling a coupling according toananembodiment according to embodimentof of thethe present present invention. invention.

[0072]

[0072] Figure 41 is Figure 41 isa aperspective perspective view view of of a side a side of aof a developing cartridge developing cartridgeaccording according to to an embodiment an embodiment of present of the the present 5 5 invention. invention. 2024200580

[0073]

[0073] Figure 42 is Figure 42 isa aperspective perspective view view andand a a longitudinal sectional longitudinal sectional view view illustrating illustrating a state a state of the of the engagement between engagement betweenthe the drive drive shaft shaft and and the the coupling coupling in the in the embodiment of embodiment ofthe thepresent present invention. invention.

10 10 [0074]

[0074] Figure 43 is Figure 43 isananexploded exploded perspective perspective viewview illustrating illustrating a astate stateofof mounting mounting thethe coupling coupling to the to the developmentsupporting development supporting member, member, in in the the embodiment embodiment of the of the present invention. present invention.

[0075]

[0075] Figure 44 is Figure 44 isa aperspective perspective view view of of a coupling a coupling 15 15 accordingto according toan anembodiment embodimentof ofthe thepresent presentinvention. invention.

[0076]

[0076] Figure 45 is Figure 45 isa alongitudinal longitudinal sectional sectional viewview illustrating anengaged illustrating an engaged state state between between the the development development shaftshaft and the coupling and the couplingaccording according to to thethe embodiment embodiment of present of the the present invention. invention.

20 20 [0077]

[0077] Figure 46 Figure 46 is is a a longitudinal longitudinal sectional sectional view view showing an engaged showing an engagedstate state between between thethe drive drive shaft shaft and the and the coupling accordingtotothe coupling according the embodiment embodiment of the of the present present invention. invention.

[0078]

[0078] Figure 47 is Figure 47 isa aside sideview view of of a rotary a rotary flange flange according toananembodiment according to embodimentof of thethe present present invention. invention.

25 25 [0079]

[0079] Figure 48 is Figure 48 isa aside sideview view of of thethe rotary rotary flange flange according tothe according to theembodiment embodiment of of thethe present present invention. invention.

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[0080]

[0080] Figure 49 illustrates Figure 49 illustratesa a locus locus of of thethe coupling coupling shown in Figure shown in Figure4747according according to to an an embodiment embodiment of present of the the present invention. invention.

[0081]

[0081] Figure 50 is Figure 50 isa asectional sectional view view of of thethe drive drive shaft shaft 5 5 and the coupling and the couplingofofFigure Figure 38 38 according according to embodiment to an an embodiment of of 2024200580

the presentinvention. the present invention.

[0082]

[0082] Figure 51 is Figure 51 isananillustration illustration of of a coupling a coupling according toananembodiment according to embodiment of of thethe present present invention. invention.

[0083]

[0083] Figure 52 is Figure 52 isa alongitudinal longitudinal sectional sectional viewview 10 10 illustrating illustrating a astate statebefore before thethe engagement engagement between between the drive the drive shaft and the shaft and thecoupling coupling concerning concerning an embodiment an embodiment of present of the the present invention. invention.

[0084]

[0084] Figure 53 is Figure 53 isa aperspective perspective view view andand a a longitudinal sectional longitudinal sectional view view of of a coupling a coupling according according to anto an 15 15 embodiment of embodiment ofthe thepresent present invention. invention.

[0085]

[0085] Figure 54 is Figure 54 isa aperspective perspective view view of of a coupling a coupling according toananembodiment according to embodimentof of thethe present present invention. invention.

[0086]

[0086] Figure 55 is Figure 55 isa alongitudinal longitudinal sectional sectional viewview showing an engaged showing an engagedstate state between between thethe drive drive shaft shaft and the and the 20 20 coupling accordingtotothe coupling according the embodiment embodiment of the of the present present invention. invention.

[0087]

[0087] Figure 56 is Figure 56 isa aperspective perspective view view showing showing the the process of process ofengagement engagement between between thethe drive drive shaft shaft and coupling and the the coupling according tothe according to theembodiment embodimentof of thethe present present invention. invention.

[0088]

[0088] Figure 57 is Figure 57 isa aperspective perspective view view of of a developing a developing 25 25 cartridge accordingtoto cartridge according anan embodiment embodiment of the of the present present invention. invention.

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[0089]

[0089] Figure 58 Figure 58 is isa aperspective perspective view view of of the the developing cartridgeaccording developing cartridge according to to the the embodiment embodiment of the of the present invention. present invention.

[0090]

[0090] Figure 59 is Figure 59 isa aperspective perspective view view illustrating illustrating a a 5 5 driving input driving inputgear gearaccording according to to an an embodiment embodiment of present of the the present 2024200580

invention. invention.

[0091]

[0091] Figure 60 is Figure 60 isa aperspective perspective view view of of a developing a developing cartridge accordingtoto cartridge according an an embodiment embodiment of the of the present present invention. invention.

[0092]

[0092] Figure 61 Figure 61 is isa aperspective perspective view view andand a a 10 10 longitudinal sectional longitudinal sectional view view of of a coupling a coupling according according to anto an embodiment of embodiment ofthe thepresent present invention. invention.

[0093]

[0093] Figure 62 Figure 62 is isananexploded exploded longitudinal longitudinal section section of of a coupling and a coupling anda adriving driving input input gear gear according according to antoembodiment an embodiment of the present of the presentinvention. invention.

15 15 [0094]

[0094] Figure 63 Figure 63 is isananexploded exploded perspective perspective viewview of the of the coupling andthe coupling and thebearing bearing member member according according to embodiment to the the embodiment of of the presentinvention. the present invention.

[0095]

[0095] Figure 64 Figure 64 is isa alongitudinal longitudinal sectional sectional viewview of aof a developing cartridge developing cartridgeaccording according to to an embodiment an embodiment of present of the the present 20 20 invention. invention.

[0096]

[0096] Figure 65 is Figure 65 isa alongitudinal longitudinal sectional sectional viewview of aof a developing cartridge developing cartridgeaccording according to to an embodiment an embodiment of present of the the present invention. invention.

[0097]

[0097] Figure 66 is Figure 66 isa aperspective perspective view view showing showing an an 25 25 engaged state engaged stateofofthe thedeveloping developing roller roller geargear and coupling and the the coupling according tothe according to theembodiment embodimentof of thethe present present invention. invention.

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[0098]

[0098] Figure 67 Figure 67 is isa alongitudinal longitudinal sectional sectional viewview illustrating processofof illustrating process engagement engagement between between the the coupling coupling and and the drive shaft the drive shaftaccording accordingto to thethe embodiment embodiment of present of the the present invention. invention.

5 5 [0099]

[0099] Figure 68 is Figure 68 isa aperspective perspective view view of of the the drive drive 2024200580

shaft and the shaft and thecoupling coupling according according to to an embodiment an embodiment of the of the present invention. present invention.

[0100]

[0100] Figure 69 is Figure 69 isa alongitudinal longitudinal sectional sectional viewview illustrating theprocess illustrating the processof of thethe disengagement disengagement of coupling of the the coupling 10 10 fromthe from thedrive driveshaft shaftaccording accordingto tothe theembodiment embodimentof ofthe the present invention. present invention.

[0101]

[0101] Figure 70 is Figure 70 isa aperspective perspective view view of of a developing a developing cartridge accordingtoto cartridge according an an embodiment embodiment of the of the present present invention. invention.

[0102]

[0102] Figure 71 is Figure 71 isa aperspective perspective view view of of a side a side of aof a 15 15 developingcartridge developing cartridgeaccording accordingtotothe theembodiment embodimentofofthe the present invention present invention(the (the side side plate plate of the of the cartridge cartridge is is omitted). omitted) .

[0103]

[0103] Figure 72 is Figure 72 isa aperspective perspective view view illustrating illustrating a a driving input driving inputgear gearaccording according to to an an embodiment embodiment of present of the the present 20 20 invention. invention.

[0104]

[0104] Figure 73 is Figure 73 isa aside sideview view of of thethe apparatus apparatus mainmain assembly accordingtotothe assembly according the embodiment embodiment of the of the present present invention. invention.

[0105]

[0105] Figure 74 is Figure 74 isa aside sideview view of of an an apparatus apparatus mainmain assembly accordingtoto assembly according anan embodiment embodiment of the of the present present invention. invention.

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- 20 31 Jan 2024

[0106]

[0106] Figure 75 Figure 75 is isa asectional sectional view view of of thethe apparatus apparatus main assembly main assemblyaccording accordingto to thethe embodiment embodiment of present of the the present invention. invention.

[0107]

[0107] Figure 76 Figure 76 is isa aperspective perspective view view andand a a 5 5 longitudinal sectional longitudinal sectional view view illustrating illustrating the the coupling coupling 2024200580

according toananembodiment according to embodimentof of thethe present present invention. invention.

[0108]

[0108] Figure 77 is Figure 77 isa aside sideview view andand a perspective a perspective viewview of aa coupling of couplingaccording accordingto to an an embodiment embodiment of present of the the present invention. invention.

10 10 [0109]

[0109] Figure 78 Figure 78 is isa alongitudinal longitudinal sectional sectional viewview illustrating theprocess illustrating the processof of engagement engagement and and process process of of disengagementbetween disengagement between the the drive drive shaft shaft and and the the coupling coupling according tothe according to theembodiment embodiment of of thethe present present invention. invention.

[BEST MODES FOR [BEST MODES FORCARRYING CARRYINGOUT OUT THETHE INVENTION] INVENTION]

15 [0110] 15 [0110] Hereinbelow,a adeveloping Hereinbelow, developing cartridge, cartridge, an an electrophotographicimage electrophotographic image forming forming apparatus, apparatus, and and a a coupling coupling member according member according toto the the present present invention invention will will be be described described with reference with referencetotothe the drawings. drawings.

[0111]

[0111] In the following In the followingembodiments, embodiments, a developing a developing cartridgeofofthe 20 cartridge 20 thetype typeininwhich whicha auser usercan canmount mountand anddemount demount the developingcartridge the developing cartridge with with respect respect to apparatus to an an apparatus main main assembly. However,the assembly. However, thepresent presentinvention inventionis isalso alsoapplicable applicable to to aa developing developingdevice device which which is is used used in ainstate a state in which in which it it is is mounted and mounted andfixed fixedtoto the the main main assembly. assembly.

25 25 [0112]

[0112] Further, thepresent Further, the presentinvention invention is is specifically specifically applicable toa asingle applicable to single coupling coupling member member (e.g., (e.g., those those shownshown in in Figures Figures 6 6(a), (a), 1414(a3), (a3), 28 28(c), (c), 30 30 and and 77(b)), 77 (b) ), , a a developing developing

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device (developing device (developingcartridge) cartridge) (e.g., (e.g., those those shown shown in Figures in Figures 2, 2, 57 and 60), 57 and 60), and andananelectrophotographic electrophotographic image image forming forming apparatus apparatus (e.g., those shown (e.g., those shownininFigures Figures 5 and 5 and 75). 75).

[Embodiment 1]

[Embodiment 1] 2024200580

(1)Brief 5 (1) 5 Brief description description of of developing developing cartridge cartridge (developing (developing device) device)

[0113]

[0113] First, with First, withreference referencetoto Figures Figures 1 4, 1 to to a4, a developingcartridge developing cartridgeB B as as a developing a developing device device to which to which an an embodiment of embodiment ofthe thepresent present invention invention is applied is applied (hereinafter (hereinafter 10 10 simply referredtotoasasa a simply referred "cartridge") "cartridge") willwill be described. be described. Figure 1 Figure 1 is is a a sectional sectional view view of of the the cartridge cartridge B. B. Figures Figures22 and 3 and 3 are are perspective perspective views views of of the the cartridge cartridge B. B. Figure Figure44is isaa sectional viewofofa acolor sectional view color electrophotographic electrophotographic image image forming forming apparatus mainassembly apparatus main assembly A (hereinafter A (hereinafter referred referred to astoanas an 15 15 "apparatus mainassembly") "apparatus main assembly"). .

[0114]

[0114] This cartridge This cartridgeB Bcan canbebe mounted mounted to to and and demounted demounted from from aa rotary rotaryC Cprovided providedto to thethe apparatus apparatus mainmain assembly assembly A by a A by a user. user.

[0115]

[0115] Referring to Referring to Figures Figures 1 1 to to 3, 3, the the cartridge cartridge B B 20 20 includes includes aa developing developing roller roller 110. The developing 110. The developing roller roller is is rotated by receiving rotated by receivinga a rotating rotating force force fromfrom the the apparatus apparatus main main assembly assembly AA through througha acoupling coupling mechanism mechanism described described laterlater during during a a developing developing function. function. In Inaadeveloper developeraccommodating accommodatingframe frame 114, 114, aa developer developert tofofa a predetermined predetermined color color is accommodated. is accommodated. 25 25 This developer This developerisisfed fed to to a developer a developer chamber chamber 113a 113a in a in a predeterminedamount predetermined amountbyby rotation rotation ofstirring of a a stirring member member 116. 116. The fed The fed developer developerisissupplied supplied to to a surface a surface of developing of the the developing roller by rotation roller by rotationofofa a sponge-like sponge-like developer developer supplying supplying roller roller 115 115 in in the the developer developer chamber chamber 113a. Thisdeveloper 113a. This developeris isformed formed

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in in aa thin thin layer layerbybybeing being supplied supplied with with electric electric charges charges by by triboelectric chargebetween triboelectric charge between a thin a thin plate-like plate-like developing developing blade 112 blade 112 and and the the developing developing roller roller 110. 110. The Thedeveloper developerformed formed in the thin in the thin layer layerononthe the developing developing roller roller 110 110 is to is fed feda to a 5 5 developing developing position position byby rotation. rotation. ByByapplying applyingaapredetermined predetermined developing biastotothe developing bias the developing developing roller roller 110,110, an electrostatic an electrostatic 2024200580

latent imageformed latent image formedonon anan electrophotographic electrophotographic photosensitive photosensitive member (hereinafter member (hereinafterreferred referred to to as"photosensitive as a a "photosensitive drum") drum") 107 107 is is developed. That is, developed. That is, the the electrostatic electrostatic latent latent image image is is 10 10 developed bythe developed by thedeveloping developing roller roller 110. 110.

[0116]

[0116] Further, developerwhich Further, developer which does does notnot contribute contribute to to the developmentofofthe the development the electrostatic electrostatic latent latent image, image, i.e.,i.e., residual developerremoving residual developer removing on on thethe surface surface of developing of the the developing roller 110 is roller 110 isremoved removedbyby thethe developer developer supplying supplying roller roller 115. 115. 15 15 At the At the same sametime, time,a afresh fresh developer developer is supplied is supplied to surface to the the surface of the developing of the developingroller roller110110 by by thethe developer developer supplying supplying roller roller 115. 115. InIn this this manner, manner, aa developing developing operation operation is is successively successively performed. performed.

[0117]

[0117] The cartridgeB Bincludes The cartridge includes a developing a developing unitunit 119.119. 20 20 The developing The developingunit unit119 119 includes includes a developing a developing device device frameframe 113 113 and and the the developer developer accommodating accommodating frame frame 114. Thedeveloping 114. The developing unit 119 further unit 119 furtherincludes includes thethe developing developing roller roller 110, 110, the the developing blade developing blade112, 112, the the developer developer supplying supplying roller roller 115, 115, the the developer chamber113a, developer chamber 113a, the the developer developer accommodating accommodating frameframe 14, 14, 25 25 and the stirring and the stirringmember member 116. 116.

[0118]

[0118] The developingroller The developing roller110 110 is is rotatable rotatable about about an an axial line L1. axial line L1.

[0119]

[0119] Here, the developing Here, the developingcartridge cartridge B is B is mounted mounted by by the user to the user toaadeveloping developing cartridge cartridge accommodating accommodating portion portion 130A 130A 30 30 providedto provided toa arotation rotationselecting selectingmechanism mechanism(developing (developingrotary) rotary)

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C of C of the the apparatus apparatus main main assembly assembly A. At A. Atthis thistime, time,asas described later, described later,a adriving driving shaft shaft of of the the apparatus apparatus main main assembly assembly AA and anda acoupling coupling member member as as a rotating a rotating driving driving forceforce transmitting partofofthe transmitting part the cartridge cartridge B are B are connected connected to each to each 5 5 other in interrelation other in interrelation with with such such an an operation operation that that the the cartridge cartridge BB is ispositioned positioned at at a predetermined a predetermined position position 2024200580

(opposing portiontotothe (opposing portion thephotosensitive photosensitive drum) drum) by the by the developing developing rotary rotary (rotation (rotation selecting selecting mechanism) mechanism) C. Thus,the C. Thus, the developing roller developing roller110 110 and and thethe like like are are rotated rotated by receiving by receiving a a 10 10 driving force driving forcefrom fromthe the apparatus apparatus main main assembly assembly A. A.

(2) Description of (2) Description of electrophotographic electrophotographic image image forming forming apparatus apparatus

[0120]

[0120] With respect With respecttotoFigure Figure 4, 4, a color a color electrophotographic image electrophotographic image forming forming apparatus apparatus using using the the 15 15 developing developing cartridge cartridge BB described described will will be be described. described. InInthe the following, description following, description will will be be made made by taking by taking a color a color laserlaser beam printer beam printerasasananexample example of of thethe color color electrophotographic electrophotographic image formingapparatus. image forming apparatus.

[0121]

[0121] As shown As shown in inFigure Figure4,4, a plurality a plurality of cartridges of cartridges 20 20 B (B1, B (B1, B2, B2, B3, B3,B4) B4)accommodating accommodating developers developers (toners) (toners) different different in in color color is is mounted mounted to to the the rotary rotary C. The mounting C. The mounting and and demounting ofthe demounting of thecartridge cartridge B with B with respect respect to rotary to the the rotary C are C are performed by performed by the the user. user. By Byrotating rotatingthe therotary rotaryC,C,aacartridge cartridge B accommodatinga adeveloper B accommodating developer of of a predetermined a predetermined colorcolor is is 25 25 disposed opposite disposed opposite to to the the photosensitive photosensitive drum drum 107. 107. Then, Then,an an electrostatic latentimage electrostatic latent image formed formed on the on the photosensitive photosensitive drum drum 107 107 is is developed. The developed developed. The developed image image is is transferred transferred onto onto aa recording recording material material S. This developing S. This developing and and transferring transferring operation operation is is performed performed for for each each of of the the colors. Asaaresult, colors. As result,aa 30 30 color color image image is is obtained. Hereinbelow,specific obtained. Hereinbelow, specificdescription description will be will be made. made. The Therecording recordingmaterial materialSSis isaamaterial materialon onwhich which

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an image can an image canbebeformed formed and and include, include, e.g., e. g. . , paper, an OHP paper, an OHPsheet, sheet, and the like. and the like.

[0122]

[0122] Referring to Referring to Figure Figure 4,4, the the photosensitive photosensitive drum drum 107 is irradiated 107 is irradiatedwith with light light based based on image on image information information from from 5 5 an an optical optical means means 101. Bythis 101. By thisirradiation, irradiation,ananelectrostatic electrostatic 2024200580

latent latent image image is is formed formed on on the the photosensitive photosensitive drum drum 107. The 107. The electrostatic latentimage electrostatic latent image is is developed developed withwith a developer a developer by by the the developing developing roller roller 110. 110. TheThedeveloper developerimage imageformed formedononthe the photosensitivedrum photosensitive drum107 107 is is transferred transferred ontoonto an intermediary an intermediary 10 10 transfer member. transfer member.

[0123]

[0123] Next, the Next, the developer developerimage image transferred transferred ontoonto an an intermediary transferbelt intermediary transfer belt 104a 104a as as the the intermediary intermediary transfer transfer member member is transferred is transferred onto onto the the recording recording material material SS by by a a second second transfer transfer means. Then, the means. Then, the recording recording material material SS onto onto 15 15 which the which the developer developerimage image is is transferred transferred is conveyed is conveyed to a to a fixing means105 fixing means 105including including a pressing a pressing roller roller 105a105a and aand a heating roller heating roller 105b. 105b. The Thedeveloper developerimage imagetransferred transferredonto ontothe the recording materialS Sisis recording material fixed fixed on on thethe recording recording material material S. S. After the After the fixation, fixation, the the recording recording material material S S is is discharged discharged on on 20 20 a tray 106. a tray 106.

[0124]

[0124] An image An image forming formingstep step will will be be described described moremore specifically. specifically.

[0125]

[0125] In synchronismwith In synchronism withrotation rotation of of thethe intermediary intermediary transfer belt104a, transfer belt 104a,the the photosensitive photosensitive drumdrum 107 107 is rotated is rotated 25 25 counterclockwisely counterclockwisely (Figure (Figure 4). Then, 4) Then, a a surface surface ofof the the photosensitivedrum photosensitive drum107 107 is is electrically electrically charged charged uniformly uniformly by a by a charging charging roller roller 108. Thesurface 108. The surfaceofofthe thephotosensitive photosensitivedrum drum 107 is irradiated 107 is irradiatedwith with light light depending depending on image on image information, information, e.g., abouta ayellow e.g., about yellowimage image by by thethe optical optical (exposure) (exposure) meansmeans

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101. Thus, aa yellow 101. Thus, yellow electrostatic electrostatic latent latent image image is is formed formed on on the photosensitivedrum the photosensitive drum 107. 107.

[0126]

[0126] The exposuremeans The exposure means101 101 is is constituted constituted as as follows. The exposure follows. The exposure means means 101 101 irradiates irradiates thethe photosensitive photosensitive 5 5 drum 107 drum 107 with withhigh highonon the the basis basis of of the the image image information information read read 2024200580

from an external from an externaldevice device (not (not shown). shown) . As aAsresult, a result, the the electrostatic latentimage electrostatic latent imageis is formed formed on the on the photosensitive photosensitive drum 107. drum 107. The Theexposure exposuremeans means101 101includes includesaalaser laserdiode, diode,aa polygon mirror, polygon mirror,a ascanner scanner motor, motor, an imaging an imaging lens, lens, and aand a 10 10 reflection mirror. reflection mirror.

[0127]

[0127] From the unshown From the unshownexternal external device, device, an image an image signal signal is is sent. sent. ByBy this this operation, operation, the the laser laser diode diode emits emits light dependingononthe light depending the image image signal signal and and the the polygon polygon mirror mirror is is irradiated irradiated with with the the light light (as (as image image light). light) TheThe polygon polygon 15 15 mirror is mirror is rotated rotatedatat a high a high speed speed by the by the scanner scanner motormotor to to reflect the image reflect the imagelight, light, SO so that that thethe surface surface of the of the photosensitivedrum photosensitive drum107 107 is is selectively selectively exposed exposed to image to the the image light light through through the the imaging imaging lens lens and and the the reflection reflection mirror. As mirror. As a result, the a result, theelectrostatic electrostatic latent latent image image depending depending on the on the 20 20 image informationisisformed image information formed on on thethe photosensitive photosensitive drum drum 107. 107.

[0128]

[0128] Simultaneously withthis Simultaneously with this electrostatic electrostatic latent latent image formation,the image formation, therotary rotary C is C is rotated, rotated, whereby whereby a yellow a yellow cartridge cartridge B1 B1 is is moved moved to to aa developing developing position. Then,aa position. Then, predetermineddeveloping predetermined developing bias bias is is applied applied to developing to the the developing 25 25 roller roller 110. As aa result, 110. As result, aa yellow yellow developer developer is is deposited deposited on on the electrostaticlatent the electrostatic latent image, image, SO so thatthat the the electrostatic electrostatic latent imageisisdeveloped latent image developed with with thethe yellow yellow developer. developer. Thereafter, Thereafter, aabias biasvoltage voltage of of an an opposite opposite polarity polarity to that to that of of the developerisisapplied the developer appliedto to a pressing a pressing roller roller (a primary (a primary 30 30 transfer roller)104j transfer roller) 104jfor for thethe intermediary intermediary transfer transfer belt belt 104a, 104a, so that the SO that the yellow yellowdeveloper developer image image on the on the photosensitive photosensitive drum drum

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107 is primary-transferred 107 is primary-transferred onto onto thethe intermediary intermediary transfer transfer belt belt 104a. 104a.

[0129]

[0129] As described As describedabove, above,after after thethe primary primary transfer transfer of the yellow of the yellowdeveloper developer image image is is completed, completed, the the rotary rotary C is C is 5 5 rotated. rotated. AsAs aa result, result, aa subsequent subsequent cartridge cartridge B2 B2 is is moved moved to to 2024200580

be located be located at at a a position position opposite opposite to to the the photosensitive photosensitive drum drum 107. The 107. Theabove-described above-describedprocess processis isperformed performedwith withrespect respecttoto a magenta cartridge a magenta cartridgeB2, B2, a cyan a cyan cartridge cartridge B3, B3, and and a a black black cartridge cartridge B4. Inthis B4. In thisway, way,by byrepeating repeatingthe theprocess processfor foreach each 10 10 of magenta,cyan, of magenta, cyan,and andblack, black, four four color color developer developer images images are are superposed onthe superposed on theintermediary intermediary transfer transfer beltbelt 104a.104a.

[0130]

[0130] Incidentally, theyellow Incidentally, the yellow cartridge cartridge B1 B1 accommodates theyellow accommodates the yellow developer developer and and forms forms the the yellow yellow developer image. developer image. The Themagenta magentacartridge cartridgeB2B2accommodates accommodatesaa 15 magentadeveloper 15 magenta developerand andforms formsa amagenta magentadeveloper developerimage. image.The The cyan cartridgeB3B3accommodates cyan cartridge accommodates a cyan a cyan developer developer and forms and forms a a cyan cyan developer developer image. image. The Theblack blackcartridge cartridgeB4B4accommodates accommodatesaa black developer black developerand andforms forms a black a black developer developer image. image.

[0131]

[0131] During the image During the imageformation formation described described above, above, a a 20 20 secondary transferroller secondary transfer roller 104b 104b is is innoncontact in a a noncontact statestate with with the the intermediary intermediary transfer transfer belt belt 104a. 104a. AAcleaning cleaningcharging charging roller 104fis roller 104f isalso alsoinin a noncontact a noncontact state state withwith the the intermediary transferbelt intermediary transfer belt 104a. 104a.

[0132]

[0132] After the After the four four color color developer developer images images are are formed formed onthe 25 on 25 theintermediary intermediarytransfer transferbelt belt104a, 104a,the thesecondary secondarytransfer transfer roller 104bis roller 104b ispressed pressed against against thethe intermediary intermediary transfer transfer belt belt 104a 104a (Figure (Figure 4). 4) InIn synchronism synchronism with with the the press press contact contact ofof the the secondary transferroller secondary transfer roller 104b, 104b, thethe recording recording material material S S waiting at waiting ata aposition positionin in thethe neighborhood neighborhood of aof a registration registration 30 30 roller pair 103e roller pair 103eisissent sent to to a nip a nip between between the the transfer transfer belt belt

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104a 104a and and the the transfer transfer roller roller 104b. At the 104b. At the same same time, time, aa recording materialS Sisis recording material fed fed from from a cassette a cassette 103a103a by a by a feeding feeding roller 103b and roller 103b anda aconveying conveying roller roller pair pair 103c103c as aas a feeding feeding (conveying) means103. (conveying) means 103.

5 5 [0133]

[0133] Immediately beforethe Immediately before theregistration registration roller roller pairpair 2024200580

103e, 103e, aa sensor sensor 99 99 is is disposed. The sensor disposed. The sensor 99 99 detects detects aa leading end of leading end ofthe therecording recording material material S and S and stopsstops the rotation the rotation of the registration of the registrationroller roller pair pair 103e, 103e, thusthus placing placing the the recording materialS Sinin recording material a standby a standby state state at aatpredetermined a predetermined 10 10 position. position.

[0134]

[0134] To the transfer To the transferroller roller 104b, 104b, a bias a bias voltage voltage of of an oppositepolarity an opposite polaritytoto that that of of thethe developer developer is applied, is applied, SO so that the developer that the developerimages images on on thethe transfer transfer beltbelt 104a 104a are are simultaneously secondary-transferred simultaneously secondary-transferred ontoonto the the conveyed conveyed 15 15 recording materialS.S. recording material

[0135]

[0135] The recordingmaterial The recording material S onto S onto which which the the developer imagesare developer images aretransferred transferred andand conveyed conveyed to fixing to the the fixing means means 105 through 105 through a a conveying belt conveying belt unit unit 103f. 103f. By Bythe thefixing fixing means means 105, fixation 105, fixation of the of the developer developer images images is is performed. performed. The The 20 20 recording materialS Ssubjected recording material subjected to to thethe fixation fixation is discharged is discharged on on aa discharging dischargingtray tray106 106 disposed disposed at upper at an an upper portion portion of the of the apparatus apparatus main main assembly assembly by by a a discharging discharging roller roller pair pair 103g. In 103g. In this way, formation this way, formationofof anan image image o the o the recording recording material material S is S is completed. completed.

25 25 [0136]

[0136] After completion After completionofofthe the secondary secondary transfer, transfer, the the charging roller104f charging roller 104fisis pressed pressed against against the the transfer transfer belt belt 104a, so that 104a, SO thatthe thesurface surfaceof of thethe beltbelt 104a104a and and the developer the developer remaining onthe remaining on thesurface surface of of thethe beltbelt 104a104a are are supplied supplied with with the the predetermined predetermined bias bias voltage. Asaaresult, voltage. As result,aaresidual residual 30 30 electric chargeisisremoved. electric charge removed.

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[0137]

[0137] The residualdeveloper The residual developer subjected subjected to to the the charge charge removal is electrostatically removal is electrostatically re-transferred re-transferred fromfrom the belt the belt 104a 104a onto the photosensitive onto the photosensitive drum drum 107107 through through a primary a primary transfer transfer nip. As nip. Asaaresult, result,the thesurface surfaceofofthe thebelt belt104a 104ais iscleaned. cleaned. 5 5 The residual The residualdeveloper developer re-transferred re-transferred ontoonto the the photosensitive photosensitive drum 107 after drum 107 afterthe thesecondary secondary transfer transfer is removed is removed by a by a cleaning cleaning 2024200580

blade 117a blade 117a contacting contacting the the photosensitive photosensitive drum drum 107. 107. The The removed developerisiscollected removed developer collected dindin a residual a residual developer developer box box 107d 107d through through a a conveying conveying passage passage (not (not shown). shown)

10 10 [0138]

[0138] Incidentally, Incidentally, ananaccommodating accommodating portion portion 130a130a is ais a chamber in which chamber in whichthe theabove-descried above-descried cartridge cartridge B is B is accommodated andisisprovided accommodated and provided to to thethe rotary rotary C atCa at a plurality plurality of of positions. The positions. Therotary rotaryC Cisisrotated rotatedin inone onedirection directionin ina a state in state in which which the the cartridge cartridge B B is is mounted mounted in in the the chamber. chamber. AsAs 15 15 a result, aacoupling a result, couplingmember member (described (described later) later) of cartridge of the the cartridge B is B is connected connectedtotoa adriving driving shaft shaft 180 180 provided provided to the to the apparatus mainassembly apparatus main assembly A and A and disconnected disconnected fromfrom the driving the driving shaft shaft 180. Thecartridge 180. The cartridgeBB(developing (developingroller roller110) 110)isismoved moved in in aa direction directionsubstantially substantially perpendicular perpendicular toaxial to an an axial line line L3 L3 20 20 direction of direction ofthe thedriving driving shaft shaft 180180 depending depending on movement on the the movement of the rotary of the rotaryC Cininone one direction. direction.

(3) Constitution of (3) Constitution of developing developing roller roller

[0139]

[0139] Next, with Next, withreference referencetoto Figures Figures 5(a) 5 (a) andand 5(b), 5 (b), a a constitution ofthe constitution of thedeveloping developing roller roller 110 110 willwill be described. be described. Figure5 5(a) 25 Figure 25 is aa perspective (a) is perspective view view of of the the developing developing roller roller 110 110 as seen from as seen froma areceiving receiving side side of of a driving a driving force force from from the main the main assembly assembly AA to tothe thedeveloping developing roller roller 110 110 (hereinafter (hereinafter simply simply referred to as referred to asa a"driving "driving side"). side" Figure . Figure 5 (b)5(b) is a is a perspective view perspective view of of the the developing developing roller roller 110 110 as as seen seen from from a a 30 30 side oppositefrom side opposite fromthe the driving driving side side withwith respect respect to axial to the the axial

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direction ofthe direction of thedeveloping developing roller roller 110 110 (hereinafter (hereinafter referred referred to as aa "non-driving to as "non-drivingside") side"). .

[0140]

[0140] The developing The developingroller roller 110 110 includes includes a developing a developing shaft shaft 153 153 and and aa rubber rubber portion portion 110a. Thedeveloping 110a. The developingshaft shaft153 153 5 5 is formed of is formed ofananelectroconductive electroconductive material material suchsuch as iron as iron or the or the 2024200580

like in an like in an elongated elongatedshaft shaft shape shape andand is covered is covered with with the the rubber portion110a rubber portion 110aatat a portion a portion except except for for bothboth end portions end portions with respect with respect to to the the axial axial direction. direction. The Thedeveloping developingshaft shaft153 153 is rotatablysupported is rotatably supportedbyby thethe developing developing device device frameframe 113 113 10 10 through bearings(not through bearings (notshown) shown) at at both both end end engaging engaging portions portions 153d1 153d1 and and 153d2. Further, aa cartridge 153d2. Further, cartridge 150 150 described described later later is is positioned at positioned at an an end end portion portion 153b 153b on on the the driving driving side. side. The The cartridge 150isisengaged cartridge 150 engaged with with a rotating a rotating force force transmitting transmitting pin 155 pin 155 described described later later to to transmit transmit a a driving driving force. force. The The 15 15 rubber portion110 rubber portion 110coaxially coaxially covers covers the the developing developing shaftshaft 153. 153. The rubber The rubber portion portion110 110 carries carries thethe developer developer and develops and develops the the electrostaticlatent electrostatic latentimage image by by application application of aof a bias bias to the to the developing shaft developing shaft153. 153.

[0141]

[0141] Nip width Nip width regulating regulatingmembers members 136136 andand 137 137 are are 20 20 members for members forregulating regulating a nip a nip width width of the of the developing developing roller roller 110 with respect 110 with respecttotothe the photosensitive photosensitive drumdrum 107 107 at a at a constant constant value. value.

[0142]

[0142] The unshown The unshownbearings bearingsare are disposed disposed at the at the bothboth end portions end portions153d1 153d1and and 153d2 153d2 of of thethe developing developing roller roller 110 so 110 SO astotosupport 25 as 25 supportrotatably rotatablythethedeveloping developingroller roller110 110ononthe the developing device developing deviceframe frame 113113 (Figure (Figure 1) 1).

[0143]

[0143] A developing A developinggear gear(not (not shown) shown) is is disposed disposed at the at the driving-sideend driving-side endportion portion 153d1 153d1 of of the the developing developing roller roller 110 110 and and fixed fixed to to the the developing developing shaft shaft 153. Theunshown 153. The unshowndeveloping developing 30 30 gear transmitsthe gear transmits therotating rotating force force received received fromfrom the apparatus the apparatus

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main assembly main assembly AA to to the developing the developing roller roller 110 110 to to other other rotating rotating members (e.g., members (e.g., the the developer supplying developer supplying roller roller 115, 115, the the stirring member,and stirring member, andthe the like) like) of of thethe developing developing cartridge cartridge B. B.

[0144]

[0144] Next, the Next, the driving-side driving-side end end portion portion of the of the 5 5 developing shaft developing shaft153 153atat which which thethe cartridge cartridge 150movably 150 is is movably 2024200580

(pivotably, swingably)mounted (pivotably, swingably) mounted will will be be described described moremore specifically. The end specifically. The end portion portion 153b 153b has has aa spherical spherical shape shape SO so that the axial that the axialline lineL2L2ofof thethe cartridge cartridge 150 150 (described (described later) later) can can be be inclined inclined smoothly. smoothly. In Inthe theneighborhood neighborhoodofofananend endof of 10 10 the developingshaft the developing shaft153, 153, thethe driving driving force force transmitting transmitting pin pin 155 for receiving 155 for receivingthetherotating rotating force force fromfrom the the cartridge cartridge 150 is 150 is disposed in disposed ina adirection direction crossing crossing thethe axial axial lineline L1 ofL1the of the developing shaft153. developing shaft 153.

[0145]

[0145] The pin 155 The pin 155asasthe therotating rotating force force transmitting transmitting 15 15 portion is portion isformed formedofofmetal metal andand fixed fixed to the to the developing developing shaft shaft 153 by aa method 153 by methodsuch suchasas press press fitting, fitting, bonding, bonding, or like. or the the like. The fixing The fixing position positionmay may be be anyany position position at which at which a driving a driving force (rotatingforce) force (rotating force)can can be be transmitted, transmitted, i.e., i.e., a direction a direction crossing theaxial crossing the axialline line L1 L1 of of thethe developing developing shaft shaft (developing (developing 20 20 roller). roller) ItItisis desirable desirable that that the the pin pin 155 155 passes passes through through a a spherical centerP2P2(Figure spherical center (Figure 10b) 10b) of of the the end end portion portion 153b 153b of of the the developing developing shaft shaft 153. Thisis 153. This isbecause becauseaatransmission transmission diameter ofthe diameter of therotating rotating force force is is always always keptkept at a at a constant constant level even in level even inthe thecase case where where thethe axial axial lineline L1 ofL1the of the 25 25 developing shaft153 developing shaft 153and and thethe axial axial line line L2 the L2 of of cartridge the cartridge 150 150 are are somewhat somewhat deviated deviated from from each each other. For this other. For this reason, reason, it is possible it is possibletotorealize realize stable stable rotating rotating force force transmission. transmission. The rotating The rotatingforce forcetransmitting transmitting point point may may be provided be provided at any at any positions. However, positions. However,in inorder orderto totransmit transmitaadriving drivingtorque torque 30 30 (rotating force)with (rotating force) withreliability reliability andand improve improve an assembly an assembly property, aasingle property, singlepin pin 155 155 is is employed employed in this in this embodiment. embodiment. The pin The pin 155 155isispassed passed through through thethe center center P2 the P2 of of end the end

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spherical spherical surface surface 153b. 153b. As As aa result, result, the the pin pin 155 155 (155a1 (155a1 and and 155a2) is disposed 155a2) is disposedSOsoasas to to be be projected projected at positions at positions 180-degree oppositefrom 180-degree opposite from each each other other atperipheral at a a peripheral surface surface of of the the driving driving shaft. Thatis, shaft. That is,the therotating rotatingforce forceisistransmitted transmitted 5 5 a two a two points. points. In Inthis thisembodiment, embodiment,the thepin pin155 155is isfixed fixedat atthe the end portion end portionside sidewithin within 5 mm 5 mm from from the the end end of drum of the the drum shaftshaft 2024200580

153. However, the 153. However, the present present invention invention is is not not limited limited thereto. thereto.

[0146]

[0146] Incidentally, Incidentally, a amain mainassembly-side assembly-side developing developing electric contact(not electric contact (notshown) shown)is is disposed disposed in apparatus in the the apparatus main main 10 10 assembly assembly AA SO soasastotocontact contact a non-driving-side a non-driving-side end portion end portion 153c 153c of of the the electroconductive electroconductive developing developing shaft shaft 153. 153. AnAn electric contact electric contact(not (not shown) shown) of of thethe developing developing cartridge cartridge and and the main assembly-side the main assembly-side developing developing electric electric contact contact are brought are brought into into contact contact with with each each other. other. InIn this this way, way, aa high-voltage high-voltage 15 15 bias is bias is supplied suppliedfrom from the the apparatus apparatus mainmain assembly assembly A to Athe to the developingroller developing roller110. 110.

(4) Description of (4) Description of rotating rotating driving driving force force transmitting transmitting part part (coupling, couplingmember) (coupling, coupling member)

[0147]

[0147] An embodiment An embodimentofofthe thecoupling coupling (coupling (coupling member) member) whichisisa arotating 20 which 20 rotatingdriving drivingforce forcetransmitting transmittingpart partasasa a principal constituent-element principal constituent-element of of the the present present invention invention will be will be described with described withreference referenceto to Figures Figures 6(a) 6 (a) to to 6(f). 6 (f) Figure . Figure 6(a) 6 (a) is is aa perspective perspectiveview viewofof thethe coupling coupling as seen as seen from from the the apparatus mainassembly apparatus main assembly side side andand Figure Figure 6(b) 6 (b) isperspective is a a perspective 25 25 view of view of the the coupling coupling asas seen seen from the from the photosensitive photosensitive drum drum side. Figure side. Figure 6(c)isisa a 6 (c) view view of of thethe coupling coupling as seen as seen from from a a direction perpendicular direction perpendicularto to a direction a direction of aofcoupling a coupling rotating rotating axis L2. axis L2. Figure Figure 6(d) 6 (d) isis a side a side view view of the of the coupling coupling as seen as seen from the apparatus from the apparatusmain main assembly assembly side side and and Figure Figure 6 (e)6(e) is ais a 30 viewof 30 view ofthe thecoupling couplingasasseen seenfrom fromthe thephotosensitive photosensitivedrumdrum

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side. Figure (f) side. Figure 6(f)isis a a sectional sectional view view ofof the the coupling coupling taken taken along S3 -- S3 along S3 S3line lineshown shownin in Figure Figure 6(d). 6 (d) .

[0148]

[0148] The developingcartridge The developing cartridge B is B is detachably detachably mounted mounted to the cartridge to the cartridgeaccommodating accommodating portion portion 130a130a in rotary in the the rotary C C 5 5 provided in provided in the the apparatus apparatus main main assembly assembly A. A. This Thismounting mountingisis 2024200580

performed by performed by the the user. user. The Therotary rotaryCCis isrotationally rotationallydriven driven and stoppedat and stopped ata aposition positionat at which which the the cartridge cartridge B reaches B reaches a a predeterminedposition predetermined position (developing (developing position position at which at which the the cartridge cartridge BB is islocated located opposite opposite to to the the photosensitive photosensitive drum drum 10 10 107). By this 107) . By thisoperation, operation, thethe coupling coupling (coupling (coupling member) member) 150 150 is engaged with is engaged witha adriving driving shaft shaft 180180 provided provided to apparatus to the the apparatus main assembly main assembly A. A. Further, Further,the therotary rotaryC Cisisrotated rotatedininone one direction to direction tomove movethe the cartridge cartridge B from B from the the predetermined predetermined position (developing position (developing position). position). That Thatis, is,the thecartridge cartridgeBBisis 15 retractedfrom 15 retracted fromthe thepredetermined predeterminedposition. position.As As a result, a result, the the coupling coupling 150 150 is is moved moved apart apart from from the the driving driving shaft shaft 180. The 180. The coupling 150receives coupling 150 receivesthe the rotating rotating force force fromfrom a motor a motor 64 64 (Figure 17) provided (Figure 17) providedtotothe the apparatus apparatus main main assembly assembly A in Aa in a state state of of engagement engagement with with the the driving driving shaft shaft 180. Thecoupling 180. The coupling 20 20 150 transmitsthe 150 transmits therotating rotating force force to to the the developing developing roller roller 110. 110. As aa result, As result,the thedeveloping developing roller roller 110 110 is rotated is rotated by the by the rotating forcereceived rotating force received from from thethe apparatus apparatus mainmain assembly assembly A. A.

[0149]

[0149] As described As describedabove, above,the the driving driving shaft shaft 180 180 has has a a pin 182 pin 182 (rotating (rotating force force applying applying portion) portion) and and is is rotated rotated by by themotor 25 the 25 motor64. 64.

[0150]

[0150] A material A materialfor forthe thecoupling coupling 150150 is is a resin a resin material such material such as as polyacetal, polyacetal, polycarbonate, polycarbonate, or or the the like. like. In In order to order to enhance enhancerigidity rigidity of of thethe coupling coupling 150,150, it isitalso is also possible to possible toenhance enhancethe the rigidity rigidity by incorporating by incorporating glassglass fiber fiber 30 30 or the like or the likeinto intothe theresin resin material material depending depending on a on a load load torque. Further, it torque. Further, it is is also also possible possible to to employ employ aa metal metal

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material. Thus, material. Thus,the thematerial materialfor forthe thecoupling coupling150 150may maybe be appropriately selectable. appropriately selectable. However, However,the theresin-made resin-madecoupling coupling can be easily can be easilyprocessed, processed,SO so that that thethe respective respective cartridges cartridges in in this embodimentare this embodiment areformed formed of of thethe resin resin material. material.

5 5 [0151]

[0151] The coupling150 The coupling 150mainly mainly comprises comprises three three 2024200580

portions. portions.

[0152]

[0152] The first The first portion portionisisengageable engageable with with the the drive drive shaft 180 (which shaft 180 (whichwill willbebe described described hereinafter) hereinafter) as shown as shown in in Figure 66(c), Figure and it (c), and it is isa adriven drivenportion portion 150a 150a for for receiving receiving the the 10 10 rotational forcefrom rotational force fromthe the rotational rotational force force transmitting transmitting pin pin 182 which is 182 which isa arotational rotational force force applying applying portion portion (main(main assembly siderotational assembly side rotational force force transmitting transmitting portion) portion) provided provided on on the the drive drive shaft shaft 180. 180. InInaddition, addition,the thesecond secondportion portionisis engageable withthe engageable with thepin pin 155155 provided provided to the to the developing developing device device 15 15 shaft 153, and shaft 153, andititisisa a driving driving portion portion 150b150b for for transmitting transmitting the the rotational rotational force force toto the the developing developing roller roller 110. 110. InIn addition, thethird addition, the thirdportion portion is is an an intermediate intermediate portion portion 150c 150c for connectingthe for connecting thedriven driven portion portion 150a 150a and and the the driving driving portion portion 150b with each 150b with eachother other(Figure (Figure 8 (c) 8 (c) and and (f) (f)). ) .

20 20 [0153]

[0153] As shown As shown in in Figure Figure (f) 6(f)the thedriven drivenportion portion150a 150a is provided with is provided witha adrive drive shaft shaft insertion insertion opening opening portion portion 150m 150m which expands which expands toward toward the the rotation rotation axis axis L2. L2. The The driving driving portion 150b portion 150bhas hasa adeveloping developing device device shaft shaft insertion insertion opening opening portion 1501. portion 150l.

25 25 [0154]

[0154] The opening The opening150m 150misisdefined defined by by a conical a conical driving driving shaft receivingsurface shaft receiving surface 150f 150f which which expands expands toward toward the drive the drive shaft shaft 180 180 (Figures (Figures 9 9 to to 13) 13) side. Thereceiving side. The receivingsurface surface150f 150f constitutes constitutes a a recess recess 150z 150z as as shown shown in in Figure Figure 66 (f). (f) TheThe recess 150z includes recess 150z includesthe the opening opening 150m 150m at aatposition a position opposite opposite

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from the developing from the developingroller roller 110110 with with respect respect to direction to the the direction of the axis of the axisL2. L2.

[0155]

[0155] By this, By this, regardless regardlessofof rotation rotation phase phase of the of the developing roller110 developing roller 110inin thethe cartridge cartridge B, the B, the coupling coupling 150 can 150 can 5 5 move (pivot) move (pivot)among amonga a pre-engagement pre-engagement angular angular position position (Figure (Figure 2024200580

22(a)), 22 (a) aarotational rotationalforce forcetransmitting transmittingangular angularposition position (Figure 22(d)), (Figure 22 (d) ),and and aa disengaging angularposition disengaging angular position (Figures (Figures 25(a) 25 (a) (d)) (d) )relative relative to the axis to the axis L3 L3ofofthe thedrive drive shaft shaft 180180 without being without beingprevented preventedby by thethe free free end end portion portion 182a 182a of the of the 10 10 drive shaft drive shaft 180. 180. The Thedetails detailsthereof thereofwill willbe bedescribed described hereinafter. hereinafter.

[0156]

[0156] A plurality A pluralityofofprojections projections (the (the engaging engaging portions) 150d portions) 150d(150d1 (150d1 - 150d4) - 150d4) areare provided provided at equal at equal intervals intervals on on aa circumference circumferenceabout aboutthethe axis axis L2 an L2 on on end an end surface surface of the of the 15 recess150z. 15 recess 150z.Between Between the the adjacent adjacent projections projections 150d, 150d, entrance entrance portions 150k portions 150k (150k1, (150k1, 150k2, 150k2, 150k3, 150k3, 150k4) 150k4) are are provided. provided. AnAn interval betweenthe interval between theadjacent adjacent projections projections 150d1 150d1 - 150d4 - 150d4 is is larger than the larger than theouter outerdiameter diameter of of thethe pin pin 182,182, so that SO that the the rotational forcetransmitting rotational force transmitting pins pins provided provided to drive to the the drive shaft shaft 20 20 180 (rotationalforce 180 (rotational forceapplying applying portions) portions) 182 182 are received. are received. The The pins are pins are the therotational rotational force force applying applying portions. portions. The recesses The recesses between the between theadjacent adjacentprojections projections areare the the entrance entrance portions portions 150k1-150k4. Whenthe 150k1-150k4. When therotational rotationalforce forceisistransmitted transmittedto tothe the coupling 150from coupling 150 fromthe thedrive drive shaft shaft 180, 180, the the pinspins 182 are 182 are 25 25 received received by by any any of of the the entrance entrance portions portions 150k1-150k4. 150k1-150k4. In In addition, addition, in in Figure Figure 66 (d), the rotational (d) the rotational force force reception reception surfaces (rotational surfaces (rotationalforce force receiving receiving portions) portions) 150e 150e (150e1- (150e1- 150e4) are provided 150e4) are providedinin the the upstream upstream withwith respect respect to the to the clockwise direction(X1) clockwise direction (X1) of of each each projection projection 150d. 150d. The The 30 30 receiving surface150e1-150e4 receiving surface 150e1-150e4 is is extended extended in direction in the the direction crossing withthe crossing with therotational rotational direction direction of the of the coupling coupling 150. 150. More particularly, More particularly,the the projection projection 150d1 150d1 has has a receiving a receiving

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surface 150e1,the surface 150e1, theprojection projection 150d2 150d2 has has a receiving a receiving surface surface 150e2, the projection 150e2, the projection150d3 150d3 hashas a receiving a receiving surface surface 150e3, 150e3, and, and, a a projection projection 150d4 150d4 has has aa receiving receiving surface surface 150e4. 150e4. InInthe the state where the state where thedrive driveshaft shaft 180180 rotates, rotates, the the pin 182a1, pin 182a1, 182a2182a2 5 5 contacts contacts to to any any of of the the receiving receiving surfaces surfaces 150e. By doing 150e. By doing so, so, the receivingsurface the receiving surface150e 150e contacted contacted by the by the pin pin 182a1, 182a1, 182a2182a2 2024200580

is is pushed pushed by by the the pin pin 182. By this, 182. By this, the the coupling coupling 150 150 rotates rotates about the axis about the axisL2. L2.

[0157]

[0157] In order to In order to stabilize stabilizethethe transmission transmission torque torque 10 10 transmitted tothe transmitted to thecoupling coupling 150150 as as much much as possible, as possible, it isit is desirable to desirable todispose disposethe the rotational rotational force force receiving receiving surfaces surfaces 150e on aa phantom 150e on phantomcircle circle(the same (the same circumference) circumference) thatthat has has a a center center OO on on the theaxis axisL2L2(Figure (Figure 6 6(d)). By this, (d) ) . By this,the therotational rotational force transmissionradius force transmission radius is is constant constant and and the the torque torque 15 15 transmitted transmitted toto the the coupling coupling 150 150 is is stabilized. stabilized. In Inaddition, addition, as for the as for the projections projections 150d, 150d, it it is is preferable preferable that that the the position of position ofthe thecoupling coupling150150 is is stabilized stabilized by balance by the the balance of of the the forces forces which which the the coupling coupling 150 150 receives. Forthat receives. For thatreason, reason, in this embodiment, in this embodiment,the the receiving receiving surfaces surfaces 150e150e are disposed are disposed 20 20 at at the the diametrically diametrically opposed opposed positions positions (180 (180 degrees). More degrees) More particularly,ininthis particularly, this embodiment, embodiment, the the receiving receiving surface surface 150e1 150e1 and the receiving and the receivingsurface surface 150e3 150e3 areare diametrically diametrically opposed opposed relative to each relative to eachother, other, and and thethe receiving receiving surface surface 150e2150e2 and and the surface150e4 the surface 150e4are arediametrically diametrically opposed opposed relative relative to each to each other.By By 25 other. 25 this this arrangement, arrangement, thethe forces forces which which thethe coupling coupling 150150 receives receives constitute constitute aa force force couple. Therefore, the couple. Therefore, the coupling coupling 150 can continue 150 can continuerotary rotary motion motion only only by receiving by receiving the force the force couple. Forthis couple. For thisreason, reason,the thecoupling coupling150 150can canrotate rotatewithout without the necessityofofbeing the necessity being specified specified in in the the position position of the of the 30 30 rotation rotation axis axis L2 L2 thereof. thereof. InIn addition, addition, asas for for the the number number thereof, aslong thereof, as longasasthe the pins pins 182182 of of the the drive drive shaft shaft 180 (the 180 (the rotational forceapplying rotational force applying portion) portion) can can enter enter the entrance the entrance portions 150k portions 150k(150k1-150k2), (150k1-150k2), ititisis possible possible to to select select suitably. suitably.

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In this embodiment, In this embodiment,asas shown shown in in Figure Figure 6, the 6, the four four receiving receiving surfaces surfaces are are provided. This embodiment provided. This embodiment is is not not limited limited to to this this example. Forexample, example. For example,the thereceiving receivingsurfaces surfaces150e 150e (projections 150d1-150d4)dodo (projections 150d1-150d4) notnot need need to disposed to be be disposed on the on the 5 5 same circumference(the same circumference (the phantom phantom circle circle C1 and C1 and Figure Figure 6 (d)6(d)). ) Or, it Or, it is is not notnecessary necessaryto to dispose dispose at the at the diametrically diametrically 2024200580

opposed opposed positions. However,the positions. However, theeffects effectsdescribed describedabove abovecan can be provided be providedbybydisposing disposingthethe receiving receiving surfaces surfaces 150e 150e as as described above. described above.

10 10 [0158]

[0158] Here, in Here, in this thisembodiment, embodiment,thethe diameter diameter of the of the pin is pin is approximately approximately2 2 mm, mm, andand a circumferential a circumferential length length of the of the entrance entrance portion portion 150k 150k is is approximately approximately 88 mm. The mm. The circumferential length circumferential length ofof thethe entrance entrance portion portion 150k 150k is anis an interval betweenadjacent interval between adjacent projections projections 150d150d (on (on the phantom the phantom 15 15 circle). Thedimensions circle). The dimensionsare arenot notlimiting limitingto tothe thepresent present invention. invention.

[0159]

[0159] Similarly tothe Similarly to theopening opening 150m, 150m, a developing a developing device shaft device shaftinsertion insertion opening opening portion portion 1501150l has has a a conical conical rotational forcereceiving rotational force receiving surface surface 150i 150i of as of an ananasexpanded an expanded 20 20 part which part whichexpands expandstoward toward thethe developing developing device device shaftshaft 153. 153. The receiving The receivingsurface surface 150i 150i constitutes constitutes a recess a recess 150q,150q, as shown as shown in Figure 66 (f) in Figure (f). .

[0160]

[0160] By this, By this, irrespective irrespectiveofof thethe rotation rotation phase phase of of the developingroller the developing roller110 110 in in thethe cartridge cartridge B, coupling B, the the coupling 150 150 25 25 can move(pivot, can move swing)among (pivot, swing) amonga arotational rotational force force transmitting transmitting angular position,a apre-engagement angular position, pre-engagement angular angular position, position, and aand a disengaging angularposition disengaging angular position to to thethe axisaxis L1 without L1 without beingbeing prevented by prevented bythe thefree free end end portion portion of the of the developing developing device device shaft shaft 153. Therecess 153. The recess150q 150qisisconstituted constitutedin inthe theillustrated illustrated 30 30 example by aaconical example by conicalreceiving receiving surface surface 150i150i whichwhich it has it has centering centering on on the the axis axis L2. Thestandby L2. The standbyopenings openings150g 150g11or or

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150g2 ("opening")are 150g2 ("opening") areprovided provided in in thethe receiving receiving surface surface 150i 150i (Figure (Figure 66(b)). (b) ) .As As for for the coupling 150, the coupling 150,the thepins pins 155 155 cancan be be inserted intothe inserted into theinside insideof of this this opening opening 150g150g 1 or 1150g2 or 150g2 SO so that it may that it may be bemounted mounted toto thethe developing developing device device shaftshaft 153. 153. 5 5 And, the And, the size sizeofofthe theopenings openings 150g150g 1 or1 150g2 or 150g2 is larger is larger than than the the outer outer diameter diameter of of the the pin pin 155. 155. ByBy doing doing so, so, irrespective irrespective 2024200580

of the rotation of the rotationphase phaseofof thethe developing developing roller roller 110the 110 in in the cartridge B,the cartridge B, thecoupling coupling150150 is is movable(pivotable, movable swingable) (pivotable, swingable) among the rotational among the rotationalforce force transmitting transmitting angular angular position position and and 10 thepre-engagement 10 the pre-engagementangular angularposition position(or(ordisengaging disengagingangular angular position) as position) aswill willbebedescribed described hereinafter hereinafter without without beingbeing prevented by prevented bythe thepin pin155. 155.

[0161]

[0161] More particularly, More particularly, thethe projection projection 150d 150d is is provided provided adjacent tothe adjacent to thefree freeend end of of thethe recess recess 150z. 150z. And, And, the the 15 15 projections(projection projections (projection portions) portions) 150d 150d project project in the in the intersection directioncrossing intersection direction crossing with with the the rotational rotational direction direction in which the in which thecoupling coupling150 150 rotates, rotates, and and are are provided provided with with the the intervals alongthe intervals along therotational rotational direction. direction. And,And, in state in the the state where the where the cartridge cartridgeB B is is mounted mounted to the to the rotary rotary C, the C, the 20 20 receiving surfaces150e receiving surfaces 150e engage engage to to or or abutted abutted to pin to the the 182, pin 182, and are pushed and are pushedbybythe thepin pin 182182 receiving receiving the the force force from from the the rotating driveshaft. rotating drive shaft.

[0162]

[0162] By this, By this, the thereceiving receiving surfaces surfaces 150e 150e receive receive the the rotational forcefrom rotational force fromthe the drive drive shaft shaft 180.180. In addition, In addition, the the 25 25 receiving surfaces150e receiving surfaces 150e are are disposed disposed in equidistant in equidistant from from the the axis L2, and axis L2, andconstitute constitute a pair a pair interposing interposing the the axis axis L2 they L2 they are constitutedbybythe are constituted the surface surface in in the the intersection intersection direction direction in the projections in the projections150d. 150d.In In addition, addition, the the entrance entrance portions portions (recesses) 150k are (recesses) 150k areprovided provided along along thethe rotational rotational direction, direction, 30 30 and they and they are aredepressed depressedin in thethe direction direction of the of the axis axis L2. L2.

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[0163]

[0163] The entranceportion The entrance portion150k 150k is is formed formed as aasspace a space between the between the adjacent adjacent projections projections 150d. 150d. In Inthe thestate statewhere wherethe the cartridge cartridge BBis ismounted mountedto to thethe rotary rotary C inC the in the case case wherewhere the the drive axis drive axis stops stopsits itsrotation, rotation, thethe pin pin 182 182 enters enters the entrance the entrance 5 5 portion 150k portion 150kwhen whenthe the coupling coupling engages engages withwith the drive the drive shaftshaft 180. And, the 180. And, thepin pin182 182ofof thethe rotating rotating drive drive shaft shaft 180 pushes 180 pushes 2024200580

the receivingsurface the receiving surface150e. 150e.Or,Or, in in the the casecase where where the drive the drive shaft 180 has shaft 180 hasalready alreadyrotated rotated when when the the coupling coupling engages engages with with the drive shaft the drive shaft180, 180,the the pinpin 182182 enters enters the the entrance entrance portion portion 10 10 150k and pushes 150k and pushesthe thereceiving receiving portion portion 150e. 150e.

[0164]

[0164] By this, By this, the thecoupling coupling 150 150 rotates. rotates.

[0165]

[0165] The rotationalforce The rotational forcereceiving receiving surface surface (rotational forcereceiving (rotational force receiving member member (portion)) (portion) 150e ) 150e may may be be disposed inside disposed insideofofthe the driving driving shaft shaft receiving receiving surface surface 150f.150f. 15 15 Or, the Or, the receiving receiving surface surface 150e 150e may may be be provided provided inin the the portion portion outwardly projected outwardly projectedfrom from thethe receiving receiving surface surface 150f 150f with with respect respect to to the the direction direction of of the the axis axis L2. When the L2. When the receiving receiving surface 150eisisdisposed surface 150e disposed inside inside of of the the receiving receiving surface surface 150f, 150f, the entranceportion the entrance portion150k 150k is is disposed disposed inside inside of receiving of the the receiving 20 20 surface 150f surface 150f

[0166]

[0166] More particularly, More particularly,the the entrance entrance portion portion 150k150k is is the recess provided the recess providedbetween between thethe projections projections 150d150d in inside in the the inside of the arc of the arc part partofofthe the receiving receiving surface surface 150f. 150f. In addition, In addition, when the when the receiving receivingsurface surface 150e 150e is is disposed disposed at position at the the position 25 25 which outwardly which outwardlyprojects, projects, thethe entrance entrance portion portion 150k 150k is the is the recess recess positioned positioned between between the the projections projections 150d. Here, the 150d. Here, the recess may be recess may bea athrough through hole hole extended extended in the in the direction direction of the of the axis axis L2, L2, or or it it may may be be closed closed atat one one end end thereof. More thereof. More particularly,the particularly, therecess recessis is provided provided by the by the space space region region 30 30 provided between provided between the the projection projection 150d. 150d. And, And,what whatis isnecessary necessary

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is just to is just to be beable abletotoenter enter thethe pinpin 182 182 intointo the region the region in the in the state where the state where thecartridge cartridge B is B is mounted mounted to the to the rotary rotary C. C.

[0167]

[0167] These structuresofofthe These structures the standing-by standing-by portion portion apply similarlytotothe apply similarly the embodiments embodiments as will as will be described be described 5 5 hereinafter. hereinafter. 2024200580

[0168]

[0168] In In Figure Figure 66 (e), the rotational (e) the rotational force force transmission surfaces(the transmission surfaces (the rotational rotational force force transmitting transmitting portions) 150h portions) 150hand and(150h (150h 1 or 1 or 150h2) 150h2) are are provided provided in the in the upstream, withrespect upstream, with respectto to thethe counterclockwise counterclockwise direction direction (X2), (X2), 10 10 of of the the opening opening 150g 150g 11 or or 150g2. And,the 150g2. And, therotational rotationalforce forceis is transmitted tothe transmitted to thedeveloping developing roller roller 110 110 fromfrom the coupling the coupling 150 150 by the by the convection convectionsections sections 150h 150h 1 150h2 1 or or 150h2 contacting contacting to the to the pins 155a1, pins 155a1, 155a2. 155a2. MoreMoreparticularly, particularly,the thetransmitting transmitting surfaces 150h1 1oror150h2 surfaces 150h 150h2 push push thethe side side surface surface of pin of the the 155. pin 155. 15 15 By this, By this, the thecoupling coupling 150 150 rotates rotates with with the the center center thereof thereof aligned aligned with with the the axis axis L2. Thetransmitting L2. The transmittingsurface surface150h1 150h1or or 150h2 is extended 150h2 is extendedininthe the direction direction crossing crossing withwith the the rotational directionofof rotational direction the the coupling coupling 150.150.

[0169]

[0169] Similarly Similarly totothe theprojection projection 150d, 150d, it is it is 20 20 desirable todispose desirable to disposethe the transmitting transmitting surfaces surfaces 150h1150h1 or 150h2 or 150h2 diametricallyopposed diametrically opposed relative relative to to each each other other on same on the the same circumference. circumference.

[0170]

[0170] At the At the time timeofofmanufacturing manufacturingthethe drum drum coupling coupling member 150 member 150 with with an injection an injection molding, molding, the the intermediate intermediate portion portion 25 25 150c 150c may may become become thin. This is thin. This is because because the the coupling coupling is is manufacturedSOsothat manufactured thatthe the driving driving force force receiving receiving portion portion 150a, 150a, the drivingportion the driving portion150b 150b andand thethe intermediate intermediate portion portion 150c 150c have a have a substantially substantially uniform uniform thickness. thickness. When Whenthe therigidity rigidityof of the intermediateportion the intermediate portion 150c 150c is is insufficient, insufficient, therefore, therefore, it it 30 30 is possible to is possible tomake makethe the intermediate intermediate portion portion 150c150c thickthick SO so

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that driven portion that driven portion150a, 150a, thethe driving driving portion portion 150b, 150b, and the and the intermediate portion150c intermediate portion 150c have have thethe substantially substantially equivalent equivalent thickness. thickness.

(6) (6) shape of supporting shape of supportingmember member 2024200580

5 5 [0171]

[0171] The description The descriptionwill willbebe made, made, referring referring to Figure to Figure 7, 7, about about a a supporting supporting member member (mounting (mounting member) member) 157. Figure77 157. Figure (a) (a) is is aa perspectiveview, perspective view, asas seen seen from from a drive a drive shaftshaft side,side, and Figure and Figure 77(b) (b)isisa a perspective perspective view, view, as seen as seen from from the the developing developing roller side. roller side.

10 [0172] 10 [0172] The supporting The supportingmember member 157 157 hashas functions functions of of holding the holding thecoupling coupling150 150 andand positioning positioning the the cartridge cartridge B in B in the the rotary rotary C. Further,it C. Further, ithas hasthe thefunction functionofofsupporting supportingthe the coupling 150SOsothat coupling 150 thatthe the rotational rotational force force can can be transmitted be transmitted to the developing to the developingroller roller 110. 110.

15 [0173] 15 [0173] More particularly, More particularly,the the supporting supporting member member 157 157 mounts the mounts thecartridge cartridge 150 150 to to thethe cartridge cartridge 150.150.

[0174]

[0174] As shown As shown in inFigure Figure7 7the the supporting supporting member member includes includes a guide 140L2 a guide 140L2during duringmounting mounting andand demounting demounting of cartridge of the the cartridge B with B with respect respecttotoananaccommodating accommodating portion portion 130a130a provided provided to to 20 20 the rotary CCand the rotary anda acylinder cylinder 140L1 140L1 for for positioning positioning the the cartridge cartridge BB in in the the accommodating accommodating portion portion 130a. And,the 130a. And, the coupling 150described coupling 150 described above above is is disposed disposed in inner in an an inner spacespace 157b of aa cylinder 157b of cylinderportion portion 157c 157c provided provided coaxially coaxially with with the the developing roller developing roller (not (not shown) shown).AtAtanan inner inner peripheral peripheral surface surface 25 25 157i constitutingthe 157i constituting thespace space 157b, 157b, ribs ribs 157e1 157e1 and 157e2 and 157e2 for for retaining thecoupling retaining the coupling150 150 in in thethe cartridge cartridge B provided. B are are provided. The ribs The ribs 157e1 157e1and and157e2 157e2 areare provided provided opposite opposite to each to each otherother with respect with respect to to a a movement movement direction direction X4 X4 of of the the cartridge cartridge BB (rotational directionofofthe (rotational direction the rotary rotary C) C). . TheThe supporting supporting member member

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157 is provided 157 is providedwith withpositioning positioning portions portions 157d1 157d1 and 157d2 and 157d2 for for fixing it to fixing it tothe thedeveloping developing device device frame frame 113 113 and and provided provided with with holes 157g1 holes 157g1oror157g2 157g2which which penetrate penetrate the the fixing fixing screw. screw.

(6) (6) Supporting constitution Supporting constitution of of coupling coupling withwith respect respect to to 5 5 cartridge frame cartridge frame 2024200580

[0175]

[0175] Referring to Referring toFigure Figure8 8 - Figure - Figure 13,13, the the description description will be will be made madeasastotothe the supporting supporting constitution(mounting constitution (mounting constitution) constitution) ofofthe thedeveloping developing roller roller 110 110 and and the coupling the coupling 150 with respect 150 with respecttotothethe developing developing device device frame(cartridge frame (cartridge 10 10 frame)113. Figure8 8isis frame) 113. Figure anan enlarged enlarged view, view, as seen as seen from from the the driving side,ofofthe driving side, themajor major part part around around the the developing developing rollerroller of of the the cartridge. Figure99is cartridge. Figure isaasectional sectionalview viewtaken takenalong along S4-S4 S4-S4 of of Figure Figure 8. Figure10 8. Figure 10is isaasectional sectionalview, view,taken takenalong along a developingaxis a developing axisL1, L1,which which illustrate illustrate the the state state before before 15 15 mounting of mounting of the the coupling coupling andand supporting supporting member. member. Figure Figure11 11is is a sectionalview a sectional viewwhich which illustrates illustrates a state a state after after the mounting. the mounting. Figure 12 is Figure 12 isa asectional sectional view view when when the the axisaxis L2the L2 of of coupling the coupling is substantiallycoaxially is substantially coaxially aligned aligned with with the the axisaxis L1 ofL1the of the developing developing roller. Figure13 roller. Figure 13isisaasectional sectionalview viewwhich which 20 20 illustrates illustrates aastate stateafter after rotating rotating the the coupling coupling through through 90 90 degrees from degrees from the the state state of of Figure Figure 12. 12. Figure Figure14 14isisaa perspectiveview perspective viewwhich which illustrates illustrates the the combined combined statestate of the of the developing rollershaft developing roller shaft andand thethe coupling. coupling. Figure Figure 14(b1)-(b5) 14 (b1) - (b5) are perspectiveviews, are perspective views, and and Figure Figure 15(a1)-(a5) 15 (a1) areviews - (a5) are views as as 25 25 seen from the seen from theaxis axisL1L1direction. direction.

[0176]

[0176] As shown As shown in inFigure Figure1414 the the coupling coupling 150 150 is is mounted SO mounted so that that the the axis axis L2 L2 thereof thereof can can incline incline in in any any direction relative direction relativetoto the the axis axis L1 L1 of the of the developing developing roller roller shaft 153 (developing shaft 153 (developingroller) roller). .

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[0177]

[0177] In Figure 14 In Figure 14(al) (a1)and andFigure Figure14 14 (b1), (b1), the the axisaxis L2 of the L2 of the coupling coupling150 150 is is co-axial co-axial withwith the the axisaxis L1 ofL1the of the developing developing roller roller 153. Thestate 153. The statewhen whenthethecoupling coupling150150isis inclined upwardfrom inclined upward fromthis this state state is is illustrated illustrated in Figure in Figure 14 14 5 5 (a2) and Figure (a2) and Figure 14 14(b2) (b2). , AsAs shown shown in in these these figures, figures, when when the the axis L2 is axis L2 is inclined inclinedtoward toward thethe opening opening 150g150g side,side, the pin the pin 2024200580

moves within moves withinthe theopening opening 150g 150g when when these these members members are are relatively relatively viewed viewed on on the the basis basis of of the the coupling. coupling. AsAs aa result, result, the coupling150 the coupling 150isisinclined inclined about about an axis an axis AX (Figure AX (Figure 12 )(a2)) 12 (a2) 10 10 perpendiculartotothe perpendicular the opening opening 150a. 150a.

[0178]

[0178] In Figure 14 In Figure 14(b3), (b3),the the state state where where the the coupling coupling 150 150 is is inclined inclined rightward rightward isis shown. shown. AsAs shown shown in in this this Figure, Figure, when the when the axis axisL2L2inclines inclinesin in thethe orthogonality orthogonality direction direction of of the opening150g, the opening 150g,the thepin pin rotates rotates within within the the opening opening 150g 150g when when 15 15 these membersare these members arerelatively relatively viewed viewed on the on the basis basis of the of the coupling. The coupling. The axis axis of of rotation rotation is axis is the the axis AY (Figure AY (Figure 14(a3)) 14 (a3) ) of the transmission of the transmissionpinpin 155. 155.

[0179]

[0179] The states where The states wherethe thecoupling coupling 150150 is inclined is inclined downward and downward andleftward leftward are are shown shown in in Figures Figures 14(a4) 14 (a4) and and (b4)(b4) and and Figures 20 Figures 20 14 14 (a5) (a5) andand (b5)(b5), respectively. , , respectively. The The coupling coupling 150 150 inclined abouteach inclined about eachofofthe the axes axes AX AX and and AY. AY.

[0180]

[0180] In the directions In the directionsdifferent different from from thethe inclining inclining direction described direction describedinin the the foregoing, foregoing, for for example, example, at anat an intermediate positioninin intermediate position thethe inclination inclination direction direction in Figures in Figures 25 25 14 (a2) and 14 (a2) and 14 14(a3) (a3), andatateach , and eachofof intermediate intermediate positions positions in in the inclinationdirections the inclination directionsin in Figures Figures 14 (a3) 14 (a3) and(a4) and 14 14 (a4) and and Figure Figure 14 14 (a5) (a5) and and 14 14 (a2), (a2) thetheinclination inclinationisismade madebyby combining therotations combining the rotations in in thethe directions directions of rotational of the the rotational axes axes AX AX and and AY. Thus,the AY. Thus, theaxis axisL2 L2can canbe bepivoted pivotedin inany any 30 30 direction relative direction relative to to the the axis axis L1. L1. At Atthis thistime, time,the thepin pin155 155 is provided to is provided tothe thedeveloping developing roller roller shaft shaft 153.153.

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[0181]

[0181] More particularly, More particularly,the the pinpin 155155 projects projects fromfrom a a peripheralsurface peripheral surfaceofof the the developing developing roller roller shaft shaft 153. 153. The The coupling 150disposed coupling 150 disposedopposite opposite to to thethe pin pin 155 155 is provided is provided with with the opening150g. the opening 150g.A Asize size of of thethe opening opening 150g150g is SO is set setthat so that 5 5 the pin does the pin doesnot notinterfere interferewithwith thethe pin pin whenwhen the axis the axis L2 L2 inclined relativetotothe inclined relative the axis axis L1.L1. 2024200580

[0182]

[0182] More particularly, More particularly,the the transmitting transmitting surface surface (rotational forcetransmitting (rotational force transmitting portion) portion) 150h150h is movable is movable relative to the relative to thepin pin(rotational (rotational force force receiving receiving portion) portion) 10 10 155(figure 155 (figure 14). The pin 14) . The pin155 155has hasthe the transmitting transmitting surface surface 150 150 in in the the movable movable condition. And, the condition. And, the transmitting transmitting surface surface 150h 150h and the pin and the pin155 155are areengaged engaged to to each each other other in rotational in the the rotational direction direction of of the the coupling coupling 150. Further,the 150. Further, thegap gapis isprovided provided between the between the transmitting transmitting surface surface 150h 150h and and the the pin pin 155. 155. By By 15 15 this, the coupling this, the coupling150 150 is is movable movable (pivotable, (pivotable, swingable) swingable) in in all directionssubstantially all directions substantially relative relative to the to the axis axis L1. L1.

[0183]

[0183] It has been It has been mentioned mentionedthat that thethe axisaxis L2 is L2 is slantable orinclinable slantable or inclinablein in anyany direction direction relative relative to axis to the the axis L1. However, L1. However,the theaxis axisL2 L2does doesnot notnecessarily necessarilyneed needtotobe be 20 20 linearly slantabletotothe linearly slantable the predetermined predetermined angle angle in full in the the full range range of of 360-degree 360-degree direction direction in in the the coupling coupling 150. For 150. For example, theopening example, the opening150g 150g cancan be be selected selected toslightly to be be slightly wider wider in in the the circumferential circumferential direction. direction. By By doing doing so, so, the the time time of of the axis L2 the axis L2inclining incliningrelative relative to to the the axisaxis L1, L1, even even if itif isit is 25 25 the case where the case whereititcannot cannot incline incline to to the the predetermined predetermined angleangle linearly, thecoupling linearly, the coupling150150 cancan rotate rotate to atoslight a slight degree degree around around the the axis axis L2. Therefore,it L2. Therefore, itcan canbe beinclined inclinedto tothe the predetermined angle. predetermined angle. In Inother otherwords, words,the theamount amountof ofthe theplay play in the rotational in the rotationaldirection direction of of thethe opening opening 150g150g is selected is selected 30 properlyif 30 properly ifnecessary. necessary.

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[0184]

[0184] In this manner, In this manner,the thecoupling coupling 150150 is is revolvable revolvable or swingableover or swingable overthe thefull-circumference full-circumference substantially substantially relative relative to to the the axis axis L1 L1 of of the the developing developing roller roller 110. More 110. More particularly,the particularly, thecoupling coupling150150 is is pivotable pivotable over over the full- the full- 5 5 circumference thereofsubstantially circumference thereof substantially relative relative to drum to the the drum shaft shaft 153. 153. 2024200580

[0185]

[0185] Furthermore, Furthermore, asaswill willbebe understood understood fromfrom the the foregoing explanation,the foregoing explanation, the coupling coupling 150 150 is capable is capable of whirling of whirling in and substantially in and substantiallyover overthethe circumferential circumferential direction direction of theof the 10 drumshaft 10 drum shaft153. 153.Here, Here, thethe whirling whirling motion motion is is notnot a motion a motion with which with whichthe thecoupling coupling itself itself rotates rotates about about the axis the axis L2, but L2, but the inclinedaxis the inclined axisL2L2rotates rotates about about the the axisaxis L1the L1 of of the developing rolleralthough developing roller although thethe whirling whirling herehere does does not preclude not preclude the rotationofofthe the rotation thecoupling coupling perper se se about about the the axis axis L2 ofL2the of the 15 15 coupling 150. coupling 150.

[0186]

[0186] It has been It has been mentioned mentionedthat that thethe axis axis L2 is L2 is slantable orinclinable slantable or inclinablein in anyany direction direction relative relative to axis to the the axis L1. However, L1. However,the theaxis axisL2L2does doesnot notnecessarily necessarilyneed needtotobe be linearly slantabletotothe linearly slantable the predetermined predetermined angle angle in full in the the full 20 20 range range of of 360-degree 360-degree direction direction in in the the coupling coupling 150. For 150. For example andthe example and theopening opening 150g 150g cancan be be selected selected toslightly to be be slightly wider in wider in the the circumferential circumferential direction. direction. ByBydoing doingso, so,the thetime time of the axis of the axisL2L2inclining inclining relative relative to the to the axisaxis L1, even L1, even if itif it is is the the case case where where it it cannot cannot incline incline to to the<> predetermined the predetermined 25 25 angle angle linearly linearly and and the the coupling coupling 150 canrotate 150 can rotateto toaaslight slight degree degree around around the the axis axis L2. Therefore,it L2. Therefore, itcan canbe beinclined inclinedto to the the predetermined predetermined angle. Inother angle. In other words, words, the the amount amount ofof the the play in play in the therotational rotational direction direction of the of the opening opening 150g 150g is is selected selected properly properly ifif necessary, necessary, in this manner in this manner and and the the 30 30 coupling 150isisrevolvable coupling 150 revolvableor or swingable swingable overover the full- the full- circumference substantially circumference substantially relative relative to drum to drum shaft shaft (rotational (rotational force force receiving receiving member) member) 153. More particularly 153. More particularly and and the the

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coupling coupling 150 ispivotable 150 is pivotableover overthe thefull-circumference full-circumferencethereof thereof substantially relative substantially relative toto thethe drum drum shaft shaft 153,153, furthermore furthermore and and as will be as will be understood understoodfrom fromthethe foregoing foregoing explanation, explanation, the the coupling coupling 150 150 is is capable capable ofof whirling whirling in andsubstantially in and substantiallyover over 5 5 the the circumferential circumferential direction direction of of the the drum drum shaft shaft 153. Hereand 153. Here and the whirlingmotion the whirling motionisis not not a motion a motion withwith which which the coupling the coupling 2024200580

itself rotatesabout itself rotates aboutthe the axis axis 12 l2 andand but but the the inclined inclined axis axis L2 L2 rotates aboutthe rotates about theaxis axis L1L1 of of thethe photosensitive photosensitive drum drum and and although thewhirling although the whirlinghere here does does notnot preclude preclude the rotation the rotation of of 10 10 the couplingper the coupling perseseabout about thethe axis axis L2 the L2 of of the coupling coupling 150. 150.

[0187]

[0187] In addition,the In addition, therange range movable movable in in allall directions directions substantially substantially isisthe therange range in in which which whenwhen the the useruser mounts mounts the the cartridge cartridge BB to tothe theapparatus apparatus main main assembly assembly A, coupling A, the the coupling can can move to move to the the rotational rotational force force transmitting transmitting angular angular position position 15 15 irrespective ofthe irrespective of thephase phaseof of thethe drive drive shaft shaft having having the the rotational rotational force force applying applying portion. portion. InInaddition, addition,ititisisthe the range in which, range in which,inindisengaging disengaging thethe coupling coupling fromfrom the drive the drive shaft, the coupling shaft, the couplingcan can move move to to thethe disengaging disengaging angular angular position irrespective position irrespectiveofof thethe stop stop angle angle phase phase of drive of the the drive 20 shaft. 20 shaft.

[0188]

[0188] In addition,the In addition, thecoupling couplingis is provided provided withwith a gap a gap between the between therotational rotational force force transmitting transmitting portion portion (rotational (rotational force transmittingsurface force transmitting surface 150h, 150h, forfor example), example), and the and the rotational forcetransmitting rotational force transmitting portion portion and and the the rotational rotational force force receivingportion 25 receiving 25 portion(pin (pin155, 155,for forexample) example)totoengage, engage,SOsothat that it is pivotable it is pivotableininall all directions directions substantially substantially relative relative to to the the axis axis L1. Inthis L1. In thismanner, manner,the thecoupling couplingis ismounted mountedto tothe the end end of the of the cartridge cartridge B. B. For Forthis thisreason, reason,the thecoupling couplingis isthe the movable substantially movable substantiallyin in allall directions directions relative relative to axis to the the axis 30 L1. 30 L1.

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[0189]

[0189] This structure This structureisissimilar similar in in thethe embodiments embodiments of of the couplingasaswill the coupling willbebe described described hereinafter. hereinafter.

[0190]

[0190] The assemblyingprocesses The assemblying processes will will be be described. described.

[0191]

[0191] After mounting After mountingthe thedeveloping developing roller roller 110 110 2024200580

5 5 rotatably tothe rotatably to thedeveloping developing device device frame frame 113,113, the 155 the pin pin is 155 is mounted to mounted to the the development development shaft shaft 153. 153. Thereafter, Thereafter,thethe development gear145 development gear 145isis assembled assembled to the to the development development shaftshaft 153. 153.

[0192]

[0192] Thereafter, asshown Thereafter, as showninin Figure Figure 10,10, the the coupling coupling 10 10 150 and the 150 and the supporting supporting member member 157157 areare inserted inserted in the in the direction X3. direction X3. First, First,the thedriving drivingportion portion150b 150bis isinserted inserted toward the direction toward the directionX3X3 downstream, downstream, while while maintaining maintaining the axis the axis L2 L2 of of the the coupling coupling 150 150 inin parallel parallel with with X3. X3. AtAtthis thistime, time,the the phase of phase of the thepin pin155 155ofof thethe development development shaft shaft 153 the 153 and and the 15 15 phase of phase of the theopening opening150g 150g of of thethe coupling coupling 150 150 are matched are matched with with each other, each other,and andthe thepin pin 155155 is is made made inserted inserted into into the openings the openings 150g1 150g1 or or 150g2. And, the 150g2. And, the free free end end portion portion 153b 153b of of the the development shaft153 development shaft 153isis abutted abutted to to the the receiving receiving surface surface 150i 150i the the coupling coupling 150. Thefree 150. The freeendendportion portion153b 153bof ofthe the 20 20 developmentshaft development shaft153 153 isis thethe spherical spherical surface surface and the and the receiving surface150i receiving surface 150i the the coupling coupling 150 150 is aisconic a conic surface. surface. Therefore, thedriving Therefore, the driving portion portion 150b 150b sideside of the of the coupling coupling 150 150 is positionedtotothe is positioned thecenter center (the (the center center of the of the spherical spherical surface) of the surface) of thefree freeend end portion portion 153b 153b of the of the development development shaft shaft 25 25 153. As 153. Aswill willbebedescribed describedhereinafter, hereinafter,when whenthe thecoupling coupling150 150 rotates by the rotates by thetransmission transmissionof of thethe driving driving force force (rotational (rotational force) from the force) from theapparatus apparatus main main assembly assembly A, the A, the pin 155 pin 155 positionedin positioned inthetheopening opening 150g 150g will will be contacted be contacted to the to the rotational rotational force force transmission transmission surfaces 150h 11 or surfaces 150h or 150h2 150h2 and and 30 30 (Figure (Figure 6b). 6b) ByBythis, this,the therotational rotationalforce forcecan canbebe transmitted. Thereafter,one transmitted. Thereafter, one157w 157wof ofthe theend endof ofsurfaces surfacesof of

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the supportingmember the supporting member157 157 is is inserted inserted downstream downstream with with respect respect to to the the direction direction X3. By this, X3. By this, aa part part of of coupling coupling 150 150is is received in the received in thespace spaceportion portion 157b 157b of the of the supporting supporting member member 157. And, the 157. And, the supporting supporting member member 157 157 is is fixed fixed in in the the 5 5 developing frame113, developing frame 113,thus, thus, an an integral integral developing developing cartridge cartridge B B is established. is established. 2024200580

[0193]

[0193] The dimensions The dimensionsofofthe the various various portions portions of the of the coupling coupling 150 150 will will be be described. described. As As shown shown in in Figure Figure 10 10 (c), (c), aa maximum outer maximum outerdiameter diameterof of thethe driven driven portion portion 150a 150a of the of the 10 10 coupling coupling 150 150 is is ΦD2, D2, aamaximum maximumouter outerdiameter diameterof ofthe thedriving driving portion 150b portion 150b is is ΦD1,and D1, andaasmall smalldiameter diameterof ofthe theopening opening150g 150g is is ΦD3. D3. InIn addition, addition, a a maximum maximum outer outer diameter diameter ofof the the pin pin 155 155 is is ΦD5, and $D5, and an aninner innerdiameter diameter of of thethe retention retention rib 157e rib 157e of the of the supporting supporting member member 157 157 is is ΦD4. Here, the DD4. Here, the maximum maximum outer outer 15 15 diameter isthe diameter is theouter outerdiameter diameter of of a maximum a maximum rotation rotation locuslocus about the rotational about the rotationalaxis axis L1 L1 of of thethe developing developing roller roller 110. 110. The maximum The maximumouter outerdiameters diameters DD1,ΦD1, andand DD3 ΦD3 relating relating to the to the coupling 150are coupling 150 arethe theouter outer diameter diameter of maximum of maximum rotation rotation locus locus about about the the axis axis L2. L2. AtAtthis thistime, time,since sinceD5 ΦD5< < D3ΦD3 is is 20 20 satisfied, thecoupling satisfied, the coupling150150 cancan be be assembled assembled to the to the predeterminedposition predetermined positionby by thethe straight straight mounting mounting operation operation in in the directionX3X3therefore, the direction therefore, thethe assembling assembling property property is high. is high. The diameter The diameter of of the the inner surface inner surface ΦD4of D4 ofthe theretention retentionrib rib 157e 157e of of the the bearing bearing member member 157 157 is is larger larger than than ΦD2 of the D2 of the 25 25 coupling coupling 150, 150, and and smaller smaller than than ΦD1 (ΦD2 D1 (D2 < <D4ΦD4 < ΦD1). < $D1) . By By this, just the this, just thestep stepattached attachedto to thethe direction direction X3 straight X3 straight is is sufficient toassemble sufficient to assemble the the supporting supporting member member 157the 157 to to the predetermined position. predetermined position. For Forthis thisreason, reason,the theassembling assembling property can property canbebeimproved improved (the (the state state after after the the assembly assembly is is 30 30 shown shown in in Figure Figure 11). 11)

[0194]

[0194] As shown As shown in inFigure Figure11, 11, the the retention retention rib rib 157e157e of of the supportingmember the supporting member157 157 is is disposed disposed closely closely to a to a flange flange

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portion 150j portion 150jofofthe thecoupling coupling 150150 in the in the direction direction of axis of the the axis L1. More L1. Morespecifically, specifically,in inthe thedirection directionofofthe theaxis axisL1, L1,the the distance from distance fromananend endsurface surface 150j1 150j1 of the of the flange flange portion portion 150j 150j to to the the axis axis of of the the pin pin 155 155 is is n1. Inaddition, n1. In addition,the thedistance distance 5 5 from an end from an end surface surface157e1 157e1of of thethe ribrib 157e157e to other to the the other end end surface surface 157j2 157j2 of of the the flange flange portion portion 150j 150j is is n2. The distance n2. The distance 2024200580

n2 n2 << distance distancen1n1isissatisfied. satisfied.

[0195]

[0195] In addition,with In addition, withrespect respect to to thethe direction direction perpendiculartotothe perpendicular theaxis axis L1,L1, thethe flange flange portion portion 150j 150j and the and the 10 10 ribs157e1, ribs 157e1,157e2 157e2are aredisposed disposedSOsothat thatthey theyare areoverlapped overlapped relative relative to to each each other. More specifically, other. More specifically, the the distance distance n4 n4 (amount of the (amount of the overlapping) overlapping) from from thethe inner inner surface surface 157e3157e3 of of the rib 157e the rib 157etotothe theouter outer surface surface 150j3 150j3 of the of the flange flange portion portion 150j is the 150j is the overlap overlapamount amountn4 n4 with with respect respect to the to the 15 15 orthogonalitydirection orthogonality directionof of thethe axis axis L1. L1.

[0196]

[0196] By By such settings, such settings, the the pin pin 155 155 is is prevented prevented from from disengaging from disengaging from the opening the opening 150g. 150g. That Thatis, is,the themovement movementof of the the coupling coupling 150 150 is is limited limited by by the the bearing bearing member member 157. Thus, 157. Thus, the the coupling coupling 150 150 does does not not disengage disengage from from the the cartridge. The cartridge. The 20 20 preventionof prevention ofdisengagement disengagementcancan be be accomplished accomplished without without additional additional parts. Thedimensions parts. The dimensionsdescribed describedabove aboveare are desirable from desirable fromthe thestandpoint standpoint of of reduction reduction of manufacturing of manufacturing and and assemblying assemblying costs. However,the costs. However, thepresent presentinvention inventionis isnot not limited to these limited to thesedimensions. dimensions.

25 25 [0197]

[0197] As described As describedabove aboveFigure Figure 9, 9, 11 11 andand 12, 12, the the receiving surface150i receiving surface 150i which which is is thethe recess recess 150q150q of the of the coupling 150isisinincontact coupling 150 contact with with thethe freefree end end surface surface 153b 153b of of the the development development shaft shaft 153 153 which which is is the the projection. Therefore, projection. Therefore, the coupling150 the coupling 150isisswung swung along along thethe freefree end end portion portion (the (the 30 30 spherical surface)153b spherical surface) 153b about about thethe center center P2 the P2 of of free the free end end portion (the portion (thespherical spherical surface) surface) 153b 153b in other in other words,words, the axis the axis

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L2 is movable L2 is movablesubstantially substantiallyin in allall directions directions irrespective irrespective of of the the phase phase of of the the drum drum shaft shaft 153. Theaxis 153. The axisL2 L2of ofthe thecoupling coupling 150 is movable 150 is movable(pivotable, (pivotable, revolvable, revolvable, movable) movable) in all in all directions directions substantially. substantially. AsAswill willbebedescribed describedhereinafter, hereinafter, 5 5 in order that in order thatthe thecoupling coupling150150 maymay engage engage withwith the drive the drive shaft shaft 180, the axis 180, the axisL2L2isisinclined inclined toward toward the the downstream downstream with with 2024200580

respect to the respect to therotating rotating direction direction of of the the rotary rotary C relative C relative to to the the axis axis L1, L1, just just before before the the engagement. engagement. In Inother otherwords, words,as as shown shown in in Figure 17, the Figure 17, the axis axis L2 L2 inclines inclines SO so that that the thedriven driven 10 10 portion 150a portion 150a of ofthe thecoupling coupling150 150positions positions atat the the downstream downstream side side with with respect respect to to the the rotational rotational direction direction X4X4ofof the the rotary. rotary.

[0198]

[0198] The still more The still moredetailed detailed description description willwill be be made. made.

15 15 [0199]

[0199] As shown As shown in inFigure Figure12, 12, a distance a distance n3 between n3 between a a maximum outer maximum outerdiameter diameter part part andand supporting supporting member member 157 157 of of the the driving portion150b driving portion 150bthe the coupling coupling 150 150 is selected is selected so that SO that a a slight slight gap gap is is provided provided between between them. By this, them. By this,the thecoupling coupling 150 is pivotable. 150 is pivotable.

20 20 [0200]

[0200] As shown As shown in inFigure Figure7,7, the the ribs ribs 157e1 157e1 and and 157e2 157e2 are semi-circularribs are semi-circular ribs extending extending in in parallel parallel with with the axis the axis L1. L1. The ribs The ribs 157e1 157e1and and157e2 157e2 areare perpendicular perpendicular to rotational to the the rotational direction X4. direction X4.

[0201]

[0201] In addition,a adistance In addition, distancen2 n2 (Figure (Figure 11) 11) in the in the 25 25 direction of direction ofthe theaxis axis L1L1 from from thethe rib rib 157e157e to flange to the the flange portion 150j portion 150jisisshorter shorter than than a distance a distance n1 from n1 from the center the center of of the the pin pin 155 155 to to the the driving driving portion portion 150b 150b side side edge. edge. ByBythis, this, the the pin 155 pin 155does doesnot notdisengage disengage from from the the openings openings 150g1150g1 and and 150g1. 150g1.

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[0202]

[0202] Therefore, Therefore, asas shown shown in in Figure Figure 9,9, the the driven driven portion 150a portion 150aisisgreatly greatly pivotable pivotable in the in the direction direction X4 relative X4 relative to to the the axis axis L2 L2 the the coupling coupling 150. Inother 150. In otherwords, words,the thedriving driving portion 150b portion 150b is is greatly greatly pivotable pivotable toward toward the the side side not not provided provided 5 5 with the with the rib rib150e 150e(perpendicular (perpendicular to the to the sheet sheet of drawing) of the the drawing). Figure Figure 99 illustrates illustratesthe the state state after after the the axisaxis L2inclined. L2 is is inclined. 2024200580

In addition,the In addition, thecoupling coupling150150 cancan also also be movable be movable to state to the the state substantially paralleltoto substantially parallel thethe axis axis L1 shown L1 as as shown In Figure In Figure 12 12 from the state from the stateofofthe theinclined inclined axis axis L2 shown L2 as as shown in Figure in Figure 9. 9. 10 10 In In this this manner, manner, the the ribs ribs 157e1 157e1 and and 157e2 157e2 are are disposed. By disposed. By doing so, doing so, the theaxis axisL2L2 ofof thethe coupling coupling 150 150 can can be made be made pivotable relative pivotable relativetoto the the axis axis L1,L1, and and in addition, in addition, the the developing frameand developing frame and1313 cancan be be prevented prevented fromfrom disengaging disengaging from from the the coupling coupling 150. Bothof 150. Both ofthe theeffects effectscan canbe beprovided. provided.

15 15 [0203]

[0203] The coupling150 The coupling 150has hasa a play play (the (the distance distance n2) n2) in in the directionofofthe the direction theaxis axis L1 L1 relative relative to the to the development development shaft shaft 153. Therefore,the 153. Therefore, thereceiving receivingsurface surface150i 150i(the (theconic conic surface) maynot surface) may notalways always contact contact snuggly snuggly the the drumdrum shaftshaft free free end portion end portion 153b 153b (the (the spherical spherical surface). surface). In Inother otherwords, words,the the 20 20 center of the center of thepivoting pivoting may may deviate deviate from from the the center center of of curvature curvature P2 P2 of of the the spherical spherical surface. However,even surface. However, evenininsuch such a case, the a case, theaxis axisL2L2isis rotatable rotatable or or pivotable pivotable relative relative to the to the axis axis L1. Forthis L1. For thisreason, reason,the thepurpose purposeof ofthis thisembodiment embodimentcan can be accomplished. be accomplished.

25 25 [0204]

[0204] In addition,maximum In addition, maximumpossible possible inclination inclination angle angle α (Figure a (Figure 9) 9)between betweenthethe axis axis L1 L1 andand the the axisaxis L2 isL2limited is limited to to one half of one half ofthe thetaper taperangle angle (α1, (a1, Figure Figure 6 (f)6(f)) between ) between thethe axisaxis L2 L2 and and the the receiving receiving surface surface 150i. Theapex 150i. The apexangle angleofofthe the conical shapeofofthe conical shape thereceiving receiving surface surface 150i150i the the coupling coupling 150 150 30 30 can can be be properly properly selected. selected. ByBydoing doingso, so,the theinclination inclinationangle angle α4 of x4 of the the coupling coupling150 150 are are setset to to the the optimal optimal value. value. The The shape of the shape of thecolumnar columnarportion portion 153a 153a of the of the development development shaftshaft

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153 153 may may be be simply simply cylindrical. By this, cylindrical. By this, the the manufacturing manufacturing cost can be cost can besaved. saved.

[0205]

[0205] The width of The width ofthe theopening opening 150g150g in in thethe standby standby state is selected state is selectedSOsothat that thethe pinpin 155155 may may not not interfere interfere when when 5 5 the axis L2 the axis L2inclines, inclines,asas described described hereinbefore. hereinbefore. 2024200580

[0206]

[0206] The locus of The locus ofthe theflange flange portion portion 150j150j whenwhen the the driven portion driven portion150a 150aside side inclines inclines in the in the direction direction X5 isX5 is illustrated illustrated by by the the region region T1 T1 in in Figure Figure 13. As shown 13. As shown in in the the Figure, even Figure, evenififthe thecoupling coupling 150150 inclines, inclines, the the interference interference 10 10 withthe with thepin pin155 155does doesnot notoccur, occur,and andtherefore, therefore,the theflange flange portion 150j portion 150jcan canbebeprovided provided over over the the full-circumference full-circumference of of the coupling150 the coupling 150(Figure (Figure 6(b)). 6 (b) Inother ) . In otherwords, words,thethe shaft shaft receiving surface150i receiving surface 150i has has conical conical shape, shape, and and therefore, therefore, when when the coupling150 the coupling 150inclines, inclines,thethe pinpin 155 155 doesdoes not not enterenter in the in the 15 15 region region T1. For this T1. For this reason, reason, the the cutting cuttingaway awayrange rangeof ofthe the coupling coupling 150 150 is is minimized. Therefore,the minimized. Therefore, therigidity rigidityof ofthe the coupling 150can coupling 150 canbebeassured. assured.

(7) Description of (7) Description of constitution constitution of of rotary rotary (moving (moving member, member, rotation selectingmechanism) rotation selecting mechanism)of of apparatus apparatus mainmain assembly assembly

20 20 [0207]

[0207] Next, with Next, withreference referencetoto Figures Figures 15 15 to 21, to 21, a a constitution ofthe constitution of therotary rotary C as C as thethe moving moving member member will will be be described. Figures described. Figures1515and and16 16are areperspective perspectiveviews viewsofofthe the rotary rotary CC in in aastate stateinin which which thethe developing developing cartridge cartridge B is B is not not mounted. Figure mounted. Figure17A 17Ais isa aperspective perspectiveview viewshowing showinga astate statein in whicha asingle 25 which 25 singledeveloping developingcartridge cartridgeB Bisismounted mountedtotothe therotary rotary C. Figures C. Figures18 18to to21 21are areside sideviews viewsshowing showingthe therotary rotaryC,C,the the photosensitivedrum photosensitive drum107, 107, a driving a driving train, train, and and the developing the developing cartridge B. cartridge B.

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[0208]

[0208] In the axial In the axialline lineL1L1direction, direction, rotary rotary flanges flanges 50L 50L and and 50R 50R are are provided provided atat both both end end portions. Outside the portions. Outside the rotary flanges50L rotary flanges 50Land and50R 50R in in thethe axial axial lineline L1 direction, L1 direction, rotary side plates rotary side plates54L 54L and and 54R54R areare provided, provided, respectively. respectively. 5 5 The rotary The rotary flanges flanges50L 50L and and 50R50R andand a central a central shaft shaft 51 thereof 51 thereof are rotatablysupported are rotatably supportedby by thethe side side plates plates 54L 54L and located and 54R 54R located 2024200580

outermostly outermostly ininthe theaxial axial line line L1 L1 direction. direction.

[0209]

[0209] At opposing At opposingsurfaces surfaces50Lb 50Lb andand 50Rb 50Rb of the of the pairpair of flanges 50L of flanges 50Land and50R, 50R, groove-like groove-like mainmain assembly assembly guides guides 10 10 130L1, 130L2,130L3, 130L1, 130L2, 130L3,130L4, 130L4, 130R1, 130R1, 130R2, 130R2, 130R3, 130R3, and 130R4 and 130R4 used duringmounting used during mountingand and demounting demounting of the of the cartridge cartridge B with B with respect to the respect to therotary rotaryC C (accommodating (accommodating portion portion 130A) 130A) are are provided. Along provided. Alongthese thesemain mainassembly assemblyguides guidesprovided providedtotothe the apparatus mainassembly apparatus main assemblyA, A, cartridge-side cartridge-side guides guides 140R1, 140R1, 140R2, 140R2, 15 15 140L1, and 140L2 140L1, and 140L2(Figures (Figures 2 and 2 and 3) 3) of the of the cartridge cartridge B areB are inserted. That is, inserted. That is, the the cartridge cartridge BB is is mountable mountable to to and and demountable demountable from from the the rotary rotary C. Thecartridge C. The cartridgeBBis isdetachably detachably mounted to mounted tothe therotary rotary C by C by thethe user. user.

[0210]

[0210] More specifically, More specifically, at at one one end end of of the the cartridge cartridge BB 20 20 (B1) with respect (B1) with respecttotoa alongitudinal longitudinal direction direction of cartridge of the the cartridge B (B1), B (B1), the the guides guides 140R1 140R1 and and 140R2 140R2 are are provided. provided. Further, Further,at at the other longitudinal the other longitudinal end end of of thethe cartridge cartridge B (B1), B (B1), the guides the guides 140L1 140L1 and and 140L2 140L2 are are provided. provided. TheThe user user holds holds the the cartridge cartridge BB and insertsthe and inserts theguides guides 140R1 140R1 andand 140R2 140R2 intointo the the guideguide 130R1130R1 providedtotothe 25 provided 25 therotary rotaryC.C.Similarly, Similarly,thethe user user inserts inserts thethe guides 140L1 guides 140L1and and140L2 140L2 into into thethe guide guide 130L1 130L1 provided provided to the to the rotary rotary C. In this C. In this way, way, the the cartridge cartridge BB is is detachably detachably mounted mounted to the accommodating to the accommodatingportion portion 130A 130A provided provided to rotary to the the rotary C by C by the the user. Thatis, user. That is,the thecartridge cartridgeBBisisguided guidedbybythe the 30 above-describedguides 30 above-described guidesand andis ismounted mountedto toand anddemounted demountedfrom from the accommodatingportion the accommodating portion 130A 130A with with respect respect to ato a direction direction crossing thelongitudinal crossing the longitudinal direction direction of the of the cartridge cartridge B B

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(developing (developing roller roller 110). The cartridge 110), The cartridge BB is is mounted mounted in in aa direction in direction inwhich whichthe the longitudinal longitudinal direction direction intersects intersects a a rotational rotational direction direction X4 X4 of of the the rotary rotary C. Therefore,the C. Therefore, the cartridge cartridge BB (coupling) (coupling) provided provided at at one one longitudinal longitudinal end end of theof the 5 5 cartridge cartridge BB is ismoved movedinin a direction a direction substantially substantially perpendiculartotothe perpendicular the driving driving shaft shaft 180 180 by rotation by rotation of the of the 2024200580

rotary rotary C. The cartridge C. The cartridge BB mounted mounted to to the the rotary rotary CC is is liable liable to rotate about to rotate aboutarcuate arcuate guides guides 140R1 140R1 and and 140L1 140L1 when when a rotating a rotating force is transmitted force is transmittedfrom from thethe apparatus apparatus mainmain assembly assembly A to A to the the 10 10 cartridge cartridge B. However, elongated B. However, elongated guides guides 140R2 140R2 and and 140L2 140L2 contact innersurfaces contact inner surfacesofof grooves grooves of the of the guides guides 130R1130R1 and 130 and 130 L1, so that L1, SO thatthe thecartridge cartridge B is B is positional positional withwith respect respect to the to the rotary rotary C. That is, C. That is, the the cartridge cartridge BB is is detachably detachably accommodated accommodated in the accommodating in the accommodatingportion portion 130A. 130A.

15 15 [0211]

[0211] Similarly, thecartridge Similarly, the cartridge B (B2) B (B2) is is guided guided by the by the guides 130R2 guides 130R2and and130L2 130L2 provided provided to to the the rotary rotary C andC detachably and detachably mounted mounted to the to the accommodating accommodating portion portion 130A. 130A. The Thecartridge cartridgeB B (B3) is (B3) is guided by guided bythe theguides guides 130R3 130R3 andand 130L3 130L3 provided provided to the to the rotary rotary CC and anddetachably detachably mounted mounted to to the the accommodating accommodating portion portion 20 20 130A. The cartridge 130A. The cartridge BB (B4) (B4) is is guided guided byby the the guides guides 130R4 130R4 and and 130L4 providedtotothe 130L4 provided therotary rotary C and C and detachably detachably mounted mounted to the to the accommodating portion130A. accommodating portion 130A.

[0212]

[0212] That is, the That is, thecartridge cartridge B is B is detachably detachably accommodated bythe accommodated by theuser userin in thethe accommodating accommodating portion portion 130A 130A providedtotothe 25 provided 25 therotary rotaryC.C.

[0213]

[0213] Figure 17 shows Figure 17 showsa astate state in in which which thethe developing developing cartridge cartridge BB is ismounted mountedinin thethe apparatus apparatus mainmain assembly assembly 4 4 (rotary C). (rotary C)

[0214]

[0214] Each of Each of the thedeveloping developing cartridges cartridges B is B is 30 30 positioned with positioned with respect respect to to the the rotary rotary C C and and is is rotated rotated by by

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rotation rotation of of the the rotary rotary C.C. AtAt this this time, time, the the developing developing cartridge cartridge BB is isfixed fixedtoto thethe rotary rotary C byC an by urging an urging spring, spring, a a lock, or the lock, or thelike like(not (not shown) shown) SO so that that a position a position of the of the developing cartridgeB B developing cartridge is is notnot deviated deviated by the by the rotation rotation of the of the 5 5 rotary C. rotary C. 2024200580

[0215]

[0215] To the To the other otherrotary rotaryside side plate plate 54L, 54L, a driving a driving mechanism for mechanism forrotating rotatingthethe developing developing roller roller (not (not shown) shown) is is provided. That provided. Thatis, is,aadeveloping developingdevice devicedriving drivinggear gear181 181 engages witha apinion engages with pinion6565 fixed fixed to to a motor a motor shaft shaft of motor of the the motor 10 10 64. When the 64. When the motor motor starts starts rotation, rotation, aa rotating rotating force force is is transmitted transmitted to to the the gear gear 181. The driving 181. The driving shaft shaft 180 180 coaxially coaxially disposed with disposed with the the gear gear 181 181 starts starts rotation. rotation. As Asaaresult, result,the the rotating forceofofthe rotating force thedriving driving shaft shaft 180 180 is transmitted is transmitted to the to the developing roller110 developing roller 110and and thethe like like through through the the coupling coupling 150. 150. 15 15 Incidentally, Incidentally, ininthis thisembodiment, embodiment, the the driving driving shaftshaft 180 has 180 has started rotationbefore started rotation before the the engagement engagement of the of the coupling coupling 150. 150. However, timing However, timingofofthe the start start of of rotation rotation of driving of the the driving shaft shaft 180 can be 180 can be appropriately appropriately selectable. selectable.

[0216]

[0216] The cartridgeB Brotates The cartridge rotates together together with with the the pairpair 20 20 of of rotary rotary flanges flanges 50L 50L and and 50R. Thatis, 50R. That is,the therotary rotaryCCstops stops its its rotation rotation when when it it is is rotated rotated a a predetermined predetermined angle. angle. AsAs aa result, the cartridge result, the cartridgeB B is is positioned positioned at aatposition a position (developing position)opposite (developing position) opposite to to thethe photosensitive photosensitive drum drum 107 107 provided to provided to the the apparatus apparatus main main assembly assembly A. A. The Thecoupling coupling150 150 25 25 engages withthe engages with thedriving driving shaft shaft 180180 substantially substantially simultaneously withthe simultaneously with the positioning positioning and and stopstop of cartridge of the the cartridge B. That B. Thatis, is,aarecess recess1502 1502covers coversan anend endof ofan anend endportion portion 180b of the 180b of the driving drivingshaft shaft 180. 180.

[0217]

[0217] The drivingshaft The driving shaft180 180has has thethe substantially substantially samesame 30 30 constitution constitution as as the the above-described above-described developing developing shaft. That shaft. That is, the driving is, the drivingshaft shaft180 180 includes includes a spherical a spherical end portion end portion

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180b and aa pin 180b and pin182 182penetrating penetrating an an almost almost center center of a of a principal principal portion 180a portion 180a ofof its its cylindrical cylindrical shape. shape. ByBythis thispin pin182, 182,aa rotating force(driving rotating force (driving force) force) is is transmitted transmitted to cartridge to the the cartridge B through B through the thecoupling coupling 150. 150.

5 5 [0218]

[0218] To the To the rotary rotaryC,C,the thefour four color color cartridges cartridges B are B are 2024200580

mounted. Here, mounted. Here,pressure pressureapplication applicationof ofthe thecartridges cartridgesB Bto to the photosensitivedrum the photosensitive drum 107 107 is is performed performed in the in the following following manner. manner.

[0219]

[0219] As described As describedabove, above,the the flanges flanges 50L50L and and 50R 50R are are 10 10 rotatably supportedbyby rotatably supported the the rotary rotary sideside plates plates 54L 54R. 54L and and 54R. The rotary The rotary side sideplates plates 54L 54L andand 54R54R at both at both endsends are positioned are positioned and fixed to and fixed toside sideplates plates (not (not shown shown of the of the apparatus apparatus main main assembly assembly AA through througha aswingable swingable shaft shaft 60 rotatably 60 rotatably disposed disposed above above the the rotary rotary side side plates plates 54L 54L and and 54R. 54R. InInother otherwords, words,the the 15 15 cartridge B,the cartridge B, therotary rotary flanges flanges 50,50, and and the the rotary rotary side side plates plates 54 54 are are integrally integrally swung swung about about the the swingable swingable shaft shaft 60. That 60. That is, integralswinging is, integral swingingmovement movement of of thethe cartridge cartridge B andB and the the rotary rotary CC is is performed. performed. As As aa result, result, the the cartridge cartridge BB is is pressed against pressed againstororseparated separated from from the the photosensitive photosensitive drum drum 107. 107.

20 20 [0220]

[0220] This pressing This pressingand andseparating separating operation operation performed performed by pressing by pressingupupa arotary rotary stay stay 66 66 disposed disposed between between the rotary the rotary side side plates plates 54L 54L and and 54R 54R by by rotation rotation of of a a cam cam (not (not shown). shown) .

[0221]

[0221] Further, asdescribed Further, as describedwith with reference reference to Figure to Figure 15, the driving 15, the drivingshaft shaft180 180 is is positioned positioned and and mounted mounted at a at a predeterminedposition 25 predetermined 25 positionofofthe theapparatus apparatusmain mainassembly assemblyA Awith with respect to aaradial respect to radialdirection directionandand an an axial axial substantially. substantially. Further, thecartridge Further, the cartridge B is B is also also positioned positioned at aat a predetermined predetermined position of position ofthe theapparatus apparatus main main assembly assembly A byA stop by stop of the of the rotation rotation of of the the rotary rotary C. These positioned C. These positioned driving driving shaft shaft 180 180 30 30 and cartridge and cartridge B B are connected are connected by by the the coupling coupling 150. 150. The The

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coupling 150isisswingable coupling 150 swingable (pivotable, (pivotable, movable) movable) with with respect respect to to the cartridgeB B(frame) the cartridge (frame). Accordingly, . Accordingly, eveneven between between the the driving shaft driving shaft180 180positioned positioned at at thethe predetermined predetermined position position and and the cartridgeB Bpositioned the cartridge positioned at at thethe predetermined predetermined position, position, the the 5 5 coupling 150isiscapable coupling 150 capableof of transmitting transmitting the the rotating rotating forceforce smoothly. That is, smoothly. That is, even even when when there there is is some some shaft shaft (axis) (axis) 2024200580

deviation betweenthe deviation between thedriving driving shaft shaft 180 180 and and the the cartridge cartridge 150, 150, the coupling150 the coupling 150can cansmoothly smoothly transmit transmit the the rotating rotating force. force.

[0222]

[0222] This is This is one oneofofremarkable remarkable effects effects of the of the 10 10 embodiment ofthe embodiment of thecoupling coupling to to which which the the present present invention invention is is applied. applied.

(8) Switching constitution (8) Switching constitution of of developing developing cartridge cartridge (developing device) (developing device)

[0223]

[0223] At each At each of ofthe theouter outerperipheral peripheral surfaces surfaces of the of the 15 15 flanges50L flanges 50Land and50R, 50R,a agear gear50a 50aisisintegrally integrallyprovided providedas as shown shown in in Figures Figures 15 15 to to 17. 17. AApair pairof ofidler idlergears gears59L 59Land and59R 59R engaged with engaged withthese thesegears gears 50a50a is is disposed disposed at both at both longitudinal longitudinal end end portions. These portions. Theseidler idlergears gears59L 59Land and59R 59Rare areconnected connectedbyby the the swingable swingable shaft shaft 60. Whenthe 60. When theflange flange50L50Ldisposed disposedat atone one 20 20 of the longitudinal of the longitudinalends ends is is rotated, rotated, the the other other flange flange 50R is 50R is rotated rotated inin phase phase through through the the gears gears 59L 59L and and 59R. By employing 59R. By employing such such aa driving drivingconstitution, constitution, during during the the rotation rotation of rotary of the the rotary C or C or the the rotation rotationofofthe the developing developing roller roller 110,110, torsion torsion of of either one either one of ofthe theflanges flanges 50L50L andand 50R 50R is prevented. is prevented.

25 25 [0224]

[0224] With the With the gears gears59L 59Land and 59R59R connected connected to the to the swinging centerofofthe swinging center therotary rotary side side plates plates 54L 54L and 54R, and 54R, i.e.,i.e., the swingableshaft the swingable shaft60, 60, a rotary a rotary driving driving geargear 65 engages. 65 engages. This gear This gear 65 65 is connected is connected to the to the motor motor 61. 61. To Toaarotating rotating shaft shaft of of the the motor motor 61, 61, an an encoder encoder 62 62 is is mounted. Theencoder mounted. The encoder 30 30 62 detects an 62 detects anamount amountofof rotation rotation of of the the motor motor 61 controls 61 and and controls

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the the number number ofof rotation. Further,at rotation. Further, atan anouter outerperipheral peripheral surface of one surface of oneflange flange50L, 50L, a flag a flag 57 projected 57 projected from from the flange the flange 50L in aa radial 50L in radialdirection direction is is provided provided (Figure (Figure 16). 16) . The flange The flange 50L and the 50L and the flag flag5757are are rotated rotated SO so as pass as to to pass through through a photo- a photo- 5 5 interruptor interruptor 58 58 fixed fixed to to the the side side plate plate 58. By detecting 58. By detecting blocking of blocking of the photo-interruptor the photo-interruptor with with the flag the flag 57, 57, the the rotary rotary 2024200580

C is C is controlled controlledSOsoasas toto rotate rotate every every predetermined predetermined angle. angle. That is, after That is, afterthe therotary rotary C rotates C rotates a predetermined a predetermined angleangle from from the time when the time whenthe theflag flag 57 57 blocks blocks thethe photo-interruptor, photo-interruptor, the the 10 firstdeveloping 10 first developingcartridge cartridgestops stopsatata aposition positionopposite oppositetotothe the photosensitive drum photosensitive drum 107. 107. The Therotary rotaryCCisisfurther furtherrotated rotatedaa predetermined angle predetermined angle in in one one direction direction and and thereafter thereafter the the second second developing cartridgestops developing cartridge stops at at a position a position opposite opposite to the to the photosensitive drum photosensitive drum 107. 107. ByByrepeating repeatingthis thisoperation operationfour four 15 15 times in total times in total(stops (stopsofof thethe four four color color developing developing cartridges), cartridges) aa color color image image is is formed. formed.

[0225]

[0225] That is, That is, the thecartridge cartridge B is B is moved moved indirection in a a direction perpendicular to perpendicular to the the axial axial line line L3 L3 of of the the driving driving shaft shaft 180 180 by by the rotate of the rotate ofthe therotary rotary C in C in oneone direction direction in ain a state state in in 20 20 which the which the cartridge cartridgeB B is is mounted mounted to the to the rotary rotary C. C.

[0226]

[0226] At an At an upper uppersurface surfaceofof the the apparatus apparatus mainmain assembly A,an assembly A, anopening opening for for mounting mounting and and demounting demounting the the developing cartridge developing cartridgeB B by by thethe user user and and an openable/closable an openable/closable cover 40 (Figure cover 40 (Figure4)4)for for covering covering thethe opening opening are provided. are provided. 25 25 Further, Further, aa door doorswitch switch (not (not shown) shown) for for detecting detecting the the open/close open/close of of the the cover cover 40 40 is is provided. provided. AA rotation rotation operation operation of the rotary of the rotaryC Cisisstarted started during during electric electric power power on when on and and when the cover 40 the cover 40isisclosed closed (when (when thethe door door switch switch is turned is turned on) on).

[0227]

[0227] (9) Positioning constitution (9) Positioning constitution ofof developing developing 30 30 cartridge (developingdevice) cartridge (developing device) during during switching switching operation operation

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[0228]

[0228] Operations ofthe Operations of therotary rotary C and C and thethe cartridge cartridge B B will be will be described describedstep step by by step step with with reference reference to Figures to Figures 18 to 18 to 21. Forease 21. For easeof ofdescription, description,only onlyone onecartridge cartridgein inthe therotary rotary is shown. is shown.

5 5 [0229]

[0229] First, in aastate First, in stateshown shown in in Figure Figure 18,18, the the 2024200580

cartridge cartridge BB does doesnot notreach reach a predetermined a predetermined position position (the (the coupling member150 coupling member 150isis located located at at a pre-rotation a pre-rotation angular angular position).When position) When thethe rotary rotary C (is C (is revolved revolved inin a direction a direction ofof X4, the flag X4, the flag5757partially partially projected projected fromfrom the the outerouter peripheral peripheral 10 10 surface of the surface of therotary rotaryflange flange50 50 described described above above reaches reaches the the photo-interruptor 58,SOso photo-interruptor 58, that that thethe rotary rotary C stops C stops at a at a predeterminedposition predetermined position(a (a state state shown shown in Figure in Figure 19) .19). At this At this time, the driving time, the drivingshaft shaft 180 180 andand thethe coupling coupling 150the 150 of of the cartridge cartridge BBare areconnected connected to to each each other other (the(the coupling coupling member member 15 15 150 is located 150 is locatedatata arotating rotating force force transmitting transmitting angular angular position). position) Thedeveloping . The developing roller roller 110 110 is placed is placed in a in a rotatable rotatable state. state. InIn this this embodiment, embodiment, thethe driving driving shaft shaft 180 180 has has already already been rotated been rotatedinina astate state in in which which the the coupling coupling 150 starts 150 starts engagement engagement with with the the driving driving shaft shaft 180. Forthis 180. For thisreason, reason,the the 20 20 developing developing roller roller 110 110 is is rotated. However,in rotated. However, inthe thecase casewhere where the drivingshaft the driving shaft180 180isis stopped stopped in in a state a state in which in which the the coupling 150isisengaged coupling 150 engaged with with thethe driving driving shaft shaft 180, 180, the the coupling coupling 150 150 waits waits in in the the rotatable rotatable state. The engagement state. The engagement (connection) of the (connection) of thecoupling coupling150150 with with thethe driving driving shaftshaft 180 180 willbebedescribed 25 will 25 describedlater laterinindetail. detail.

[0230]

[0230] Then, as described Then, as describedabove, above,thethe camcam (not (not shown) shown) is is actuated tocontact actuated to contactthe the rotary rotary stay stay 66, 66, so that SO that the rotary the rotary C C is moved counterclockwisely is moved counterclockwisely about about thethe swingable swingable shaftshaft 60. 60. That is the That is thedeveloping developing roller roller 110110 contacts contacts the the photosensitive photosensitive 30 30 drum 107 drum 107 by bybeing beingmoved moved in in an an X1 X1 direction direction (a state (a state of Figure of Figure 20). Then, 20) Then, a a predetermined predetermined image image forming forming operation operation isis performed. performed.

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[0231]

[0231] When the When the image imageforming forming operation operation is completed, is completed, the rotary CCisisrotated the rotary rotated in in a clockwise a clockwise direction direction aboutabout the the swingable shaft6060bybya a swingable shaft force force of of a spring a spring (not(not shown). shown) . Thus,Thus, the rotary CCisisrestored the rotary restoredto to thethe state state shown shown in Figure in Figure 19. 19. 5 5 That is, That is, the thedeveloping developing roller roller 110110 is moved is moved apart apart from from the the photosensitivedrum photosensitive drum107 107 (the (the coupling coupling member member 150located 150 is is located at at 2024200580

a disengagementangular a disengagement angular position). position) .

[0232]

[0232] Then, the rotary Then, the rotaryC Cisisrotated rotated about about the the central central shaft 51 in shaft 51 in the theX4X4direction directionSO so thatthat a subsequent a subsequent cartridge cartridge B B 10 10 can reach the can reach thedeveloping developing position position (a state (a state of Figure of Figure 21) .21). At At this time, the this time, theconnection connection between between thethe driving driving shaft shaft 180 and 180 and the the coupling coupling 150 150 is is released. Thatis, released. That is,the thecoupling coupling150 150is is disconnected disconnected from from the the driving driving shaft shaft 180. Theoperation 180. The operationat at this time will this time willbebespecifically specifically described described later. later.

15 15 [0233]

[0233] The above-describedoperations The above-described operations from from the the operation describedwith operation described with reference reference to Figure to Figure 18the 18 to to the operation describedwith operation described with reference reference to Figure to Figure 21 repeated 21 are are repeated four times in four times intotal totalfor for four four colors, colors, so that SO that color color imageimage formation iseffected. formation is effected.

20 20 (10) Engaging operation (10) Engaging operation/ /Rotational Rotational force force transmission transmission / / Disengaging operation, Disengaging operation, ofof thethe coupling. coupling.

[0234]

[0234] As has As has been been described described in in the the foregoing, foregoing, immediately immediately before the before thecartridge cartridgeB B stops stops at at thethe predetermined predetermined position position of of the apparatusmain the apparatus mainassembly assembly A, A, or or substantially substantially simultaneously simultaneously 25 25 therewith, thecoupling therewith, the coupling 150 150 is is engaged engaged withwith the the drivedrive shaftshaft 180. (From Figure 180. (From Figure 18 18 to to Figure Figure 19) 19). And, when . And, when the the cartridge cartridge B moves B moves from fromthe thepredetermined predetermined position position of the of the apparatus apparatus main main assembly afterthe assembly after therotation rotation during during the the predetermined predetermined period, period, the coupling150 the coupling 150isisdisengaged disengaged from from the the drive drive shaft shaft 180 180 30 30 (from Figure 20 (from Figure 20 to toFigure Figure21) 21). .

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[0235]

[0235] Referring to Referring toFigure Figure22-Figure 22-Figure 25,25, the the description willbebemade description will made with with respect respect to the to the engaging engaging operation, therotational operation, the rotational force force transmitting transmitting operation operation and the and the disengaging operation disengaging operation of of the the coupling. coupling. Figure Figure22 22isisaa 5 5 longitudinal sectional longitudinal sectional view view illustrating illustrating the the drive drive shaft, shaft, the the coupling, coupling, and and the the development development shaft. Figure23 shaft. Figure 23is isaa 2024200580

longitudinal sectional longitudinal sectional view view illustrating illustrating the the phase phase difference difference among the drive among the driveshaft, shaft, thethe coupling, coupling, and and the the development development shaft. Figure 25 shaft. Figure 25 is is aa longitudinal longitudinal sectional sectional view view 10 10 illustrating thedrive illustrating the drive shaft, shaft, thethe coupling, coupling, and and the the developmentshaft. development shaft.

[0236]

[0236] In the process In the processininwhich which the the cartridge cartridge B moves B moves to to the developingposition the developing positionby by thethe rotation rotation of the of the rotary rotary C, the C, the coupling 150isispositioned coupling 150 positionedat at thethe pre-engagement pre-engagement angular angular 15 15 position.More position. More particularly, particularly, thethe axis axis L2 L2 of of thethe coupling coupling is is beforehandinclined beforehand inclinedrelative relative to to thethe axisaxis L1 ofL1the of development the development shaft 153 SO shaft 153 sothat thatthe thedriven driven portion portion 150a150a positions positions downstream downstream of of the the rotary rotary rotational rotational direction direction X4. X4. By Bythis thisinclination inclinationofof the coupling150, the coupling 150,a adownstream downstream free free end end position position 150A1150A1 of the of the rotaryC Cwith 20 rotary 20 withrespect respecttotothe therotational rotationaldirection directionX4X4thereof thereof is positionedatatthe is positioned thedevelopment development shaft shaft 153 153 sideside beyond beyond a drive a drive shaft free-end180b3 shaft free-end 180b3with with respect respect to the to the direction direction of axis of the the axis L1. In L1. Inaddition, addition,ananupstream upstreamfree freeend endposition position150A2 150A2with with respect to the respect to thedirection directionX4 X4 is is positioned positioned at the at the pin side pin 182 182 side 25 25 beyond the beyond thedrive driveshaft shaft free-end free-end 180b3 180b3 in the in the direction direction of the of the axis L1 (Figure axis L1 (Figure2222(a) (a), (b)). , (b) Here,the ) . Here, thefree free end end position position is is the positionnearest the position nearesttoto the the drive drive shaft shaft withwith respect respect to the to the direction of direction ofthe theaxis axis L2L2 of of thethe driven driven portion portion 150a 150a of the of the coupling coupling 150 150 shown shown in in Figure Figure 6 6 (a) (a) and and (c), andit (c) and itis isthe the 30 30 remotest remotest position position from from the the axis axis L2. In other L2. In other words, words, it it is is an an edge line of edge line ofthe thedriven driven portion portion 150a 150a of the of the coupling coupling 150, 150, or or an edge line an edge lineofofthe thedriven driven projection projection 150d150d depending depending on the on the rotation phaseofofthe rotation phase thecoupling coupling (150A (150A in Figure in Figure 6 (a)6 and (a) (c) and) (c)). .

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[0237]

[0237] First, the downstream First, the downstreamfree free endend position position 150A1 150A1 with respect with respect to to the the rotary rotary rotational rotational direction direction (X4) (X4) passes passes by by the the shaft shaft free-end free-end 180b3. And,after 180b3. And, afterthe thecoupling coupling150 150passes passes the drive shaft the drive shaft180, 180,the the receiving receiving surface surface 150f150f or the or the 5 5 projection 150d projection 150dofofconical conical shape shape of the of the coupling coupling 150 contacts 150 contacts to the free to the free end endportion portion 180b 180b or or thethe pin pin 182 182 of drive of the the drive shaft shaft 2024200580

180. And,it 180. And, itinclines inclinesininresponse responseto tothe therotation rotationofofthe the rotary rotary CC SO so that thatthe theaxis axisL2 L2 becomes becomes parallel parallel to axis to the the axis L1 L1 (Figure 22 (c) (Figure 22 (c)). And, finally, ) . And, finally,thetheposition position of of thethe cartridge cartridge 10 10 B is B determinedrelative is determined relativetoto thethe apparatus apparatus mainmain assembly assembly A. A. More particularly, More particularly, the the rotary rotary CC stops. stops. Under Underthe thepresent present circumstances, thedrive circumstances, the drive shaft shaft 180180 and and the the development development shaftshaft 153 153 are are substantially substantially co-axial co-axial with with each each other. More other. More particularly,the particularly, thecoupling coupling 150150 is is moved moved fromfrom the pre- the pre- 15 15 engagement angularposition engagement angular position to to thethe rotational rotational force force transmitting angularposition transmitting angular positionSO so as as to permit to permit the free the free end end position 150A1 position 150A1thereof thereofto to circumvent circumvent the the drive drive shaftshaft 180 180 (pivoting and swinging) (pivoting and swinging). And, . And, thethe coupling coupling 150 150 is inclined is inclined from the pre-engagement from the pre-engagement angular angular position position toward toward the rotational the rotational 20 20 force transmittingangular force transmitting angular position position where where the the axis axis L2 isL2 is substantially substantially co-axial co-axial with with the the axis axis L1. And, the L1. And, the coupling coupling 150 and the 150 and the drive driveshaft shaft 180180 areare engaged engaged withwith eacheach otherother (Figure 22 (d) (Figure 22 (d)). More particularly, ) . More particularly,the the recess recess 150z 150z covers covers the the free free end end portion portion 180b. Bythis, 180b. By this,the therotational rotationalforce forceis is 25 25 enabled to be enabled to bestably stablytransmitted transmitted from from the the drive drive shaftshaft 180 to 180 to the the coupling coupling 150. 150. InInaddition, addition,atatthis thistime, time,the thepin pin152152isis in the opening in the opening150g 150g(Figure (Figure 6 (b)), 6 (b) andthe ) , and thepin pin 182182 is is in in the the entrance portion entrance portion150k. 150k.

[0238]

[0238] In this embodiment, In this embodiment,when when the the coupling coupling 150 150 starts starts 30 30 the engagementwith the engagement withthe the drive drive shaft shaft 180,180, the the drive drive shaftshaft 180 180 is is already already rotating. For this rotating. For this reason, reason, the the coupling coupling 150 150 begins begins the the rotation rotation immediately. However,when immediately. However, whenthe thedrive driveshaft shaft180180 is at rest is at rest at atthe thetime time ofof thethe engagement engagement withwith the drive the drive shaftshaft

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180 of the 180 of the coupling coupling150, 150, thethe coupling coupling member member 150 stands 150 stands by by with the with the rotatable rotatablestate, state, when when thethe pin pin 182 182 is present is present in the in the entrance portion150k. entrance portion 150k.

[0239]

[0239] As has As has been beendescribed described hereinbefore, hereinbefore, according according to to 5 5 this embodiment,the this embodiment, thecoupling coupling 150150 is pivotable is pivotable relative relative to the to the 2024200580

axis axis L1. Therefore,the L1. Therefore, thecoupling coupling150 150can canbebeengaged engagedrelative relative to the drive to the driveshaft shaft180 180 correspondingly correspondingly to the to the rotation rotation of the of the rotary rotary CC by by the thecoupling coupling150150 perper se se inclining, inclining, without without interfering interfering with with the the drive drive shaft shaft 180 180 (coupling). (coupling)

10 10 [0240]

[0240] Furthermore, theengaging Furthermore, the engaging operation operation of the of the coupling 150described coupling 150 described above above is is possible possible regardless regardless of the of the phase difference phase difference between between the the drive drive shaft shaft 180 180 and and the the coupling coupling 150. Referring to 150. Referring to Figure Figure 14 14 and and Figure Figure 23, 23, the the description description will be will be made madeasastotothe the phase phase difference difference between between the coupling the coupling 15 15 and and the the drive drive shaft. Figure23 shaft. Figure 23illustrates illustratesthethephases phasesofofthe the coupling andthe coupling and thedrive drive shaft. shaft. In Figure In Figure 23 ,(a), 23 (a) the 182 the pin pin 182 and the driving and the drivingshaft shaftreceiving receiving surface surface 150f150f of coupling of the the coupling 150 oppose relative 150 oppose relativetoto each each other other in the in the upstream upstream with with respect respect to to the the rotational rotational direction direction X4 X4 of of the the rotary. rotary. InInFigure Figure23 23 20 20 (b), the pin (b), the pin 182 182and andthe theprojection projection 150d 150d of the of the coupling coupling 150 150 oppose oppose relative relative toto each each other. other. InInFigure Figure23 23(c), (c),the thefree freeend end portion 180b portion 180bofofthe thedrive drive shaft shaft andand the the projection projection 150d 150d of the of the coupling coupling 150 150 oppose oppose relative relative toto each each other. other. InIn Figure Figure 23 23 (d), (d), the free end the free endportion portion180b 180b andand thethe receiving receiving surface surface 150f 150f of of thecoupling 25 the 25 couplingoppose opposerelative relativetotoeach eachother. other.As As shown shown in in Figure 14, Figure 14,the thecoupling coupling 150150 is is mounted mounted pivotably pivotably in the in all all the directions directions relative relative toto the the development development shaft shaft 153. Forthis 153. For this reason, as shown reason, as shownininFigure Figure 23,23, thethe coupling coupling 150 150 is pivotable is pivotable in the mounting in the mountingdirection direction X4 X4 irrespective irrespective of the of the phasephase of the of the 30 30 development shaft153 development shaft 153with with respect respect to the to the rotational rotational direction direction X4. In X4. Inaddition, addition,the thedownstream downstreamfree freeend endposition position150A1 150A1is is positioned in positioned inthe thedeveloping developing roller roller 110 110 sideside from from the drive the drive

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shaft free-end180b3 shaft free-end 180b3inin the the rotational rotational direction direction not related not related irrespective ofthe irrespective of thephase phase difference difference between between the the drivedrive shaftshaft 180 180 and and the the coupling coupling 150. 150. InIn addition, addition, the the inclination inclination angle angle of the coupling of the coupling150 150isis set set SO so that that the the upstream upstream free free end end 5 5 position 150A2 position 150A2positions positionsin in thethe pinpin 182 182 sideside beyond beyond the drive the drive shaft shaft free-end free-end 180b3 180b3 in in the the rotational rotational direction direction X4. With X4. With 2024200580

such such aa setting, setting,the thedownstream downstream free free end end position position 150A1150A1 in the in the rotational rotational direction direction X4X4 passes passes by by the the drive drive shaft shaft free-end free-end 180b3 in response 180b3 in responsetotothe the rotating rotating operation operation of rotary of the the rotary C. C. 10 10 And, in And, in the thecase caseofofFigure Figure 23 23 (a), (a), the the driving driving shaftshaft receiving receiving surface surface 150f 150f contacts contacts to to the the pin pin 182. 182. InIn the the case case of of Figure Figure 23 23 (b), (b), the the projection projection 150d 150d contacts contacts to to the the pin pin 182. 182. In Inthe the case case of of Figure Figure 23 23 (c), theprojection (c) the projection150d 150dcontacts contactsto tothe the free free end end portion portion 180b. In the 180b. In the case case of of Figure Figure 23 23 (d), (d), the the 15 15 receiving surface150f receiving surface 150fcontacts contacts to to the the freefree end end portion portion 180b.180b. In addition,the In addition, theaxis axisL2L2 approaches approaches to the to the position position in in parallel with parallel withthe theaxis axisL1 L1 by by thethe contact contact force force (urging (urging force) force) produced when produced whenthe therotary rotary C rotates, C rotates, and and theythey engage engage with with each each other other (coupling). (coupling) ForFor this this reason, reason, irrespective irrespective ofof the the phase phase 20 20 difference betweenthe difference between the drive drive shaft shaft 180 180 and and the the coupling coupling 150 or 150 or between the between the coupling coupling 150 150 and and the the development development shaft shaft 153, 153, they they can engage with can engage witheach eachother. other.

[0241]

[0241] Referring to Referring toFigure Figure24, 24, thethe rotational rotational force force transmitting operation transmitting operation inin thethe case case of the of the rotation rotation of the of the developingroller 25 developing 25 roller110 110will willbebedescribed. described.TheThe drive drive shaft shaft 180180 rotates togetherwith rotates together withthe the gear gear (helical (helical gear) gear) 181the 181 in in the direction ofX8X8ininthe direction of the Figure Figure by by thethe rotational rotational forceforce received received from from the the motor motor 64. And, the 64. And, the pins pins 182 182 integral integral with with the the drive drive shaft 180 contact shaft 180 contacttotoany any of of thethe rotational rotational force force receiving receiving 30 30 surfaces surfaces 150e1-150e4 150e1-150e4 of of the the coupling coupling 150. By this, 150. By this, the the coupling coupling 150 150 rotates. Thecoupling rotates. The coupling150 150further furtherrotates. rotates.ByBy this, the rotational this, the rotationalforce force transmitting transmitting surface surface 150h 150h 1 or 1 or 150h2 of the 150h2 of thecoupling coupling150 150 contacts contacts to the to the pin pin 155 integral 155 integral

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with the with the development development shaft shaft 153. 153. Then, Then,the therotational rotationalforce forceof of the drive shaft the drive shaft180 180rotates rotates thethe developing developing roller roller 110 through 110 through the coupling150 the coupling 150and andthe the development development shaft shaft 153.153.

[0242]

[0242] In addition,the In addition, thefree freeend end portion portion 153b 153b of the of the 5 5 developmentshaft development shaft153 153 isis contacted contacted to the to the receiving receiving surface surface 2024200580

150i. The free 150i. The free end end portion portion 180b 180b of of the the drive drive shaft shaft 180 180 is is contacted contacted to to the the receiving receiving surface surface 150f. 150f. By Bythis, this,the the coupling coupling 150 150 is is positioned positioned correctly correctly (Figure (Figure 22d). More 22d). More particularly,the particularly, thecoupling coupling 150150 is is positioned positioned to drive to the the drive 10 10 shaft180 shaft 180bybythe therecess recess150z 150zcovering coveringthethefree freeend endportion portion 180. At this 180. At this time, time, even even if if the the axis axis L3 L3 and and the the axis axis L1 L1 are are somewhat non-coaxialwith somewhat non-coaxial with each each other, other, the the coupling coupling 150 can 150 can rotate withoutapplying rotate without applying the the large large load load to the to the development development shaft 153 and shaft 153 andthe thedrive drive shaft shaft 180180 by the by the small small inclination inclination of of 15 15 the the coupling coupling 150. Forthis 150. For thisreason, reason,even evenififthe thedrive driveshaft shaft 180 180 and the and the development development shaft shaft 153153 deviate deviate fromfrom each each otherother by by slight positiondeviation slight position deviationof of thethe cartridge cartridge B due B due to the to the rotation of the rotation of therotary rotaryC,C, thethe coupling coupling 150 150 can can transmit transmit the the rotational forcesmoothly. rotational force smoothly.

20 20 [0243]

[0243] This is This is one oneofofthe theremarkable remarkable effects effects according according to an embodiment to an embodimentofofthe the coupling coupling of of the the present present invention. invention.

[0244]

[0244] Referring to Referring toFigure Figure25, 25, thethe description description willwill be be made about made about the the disengaging disengaging operation operation ofof the the coupling coupling 150 150 from from the drive shaft the drive shaft180 180inin response response to to the the movement movement of the of the 25 25 cartridge cartridge BBfrom fromthe thepredetermined predetermined position position (developing (developing position) by position) bythe therotary rotary C rotating C rotating in the in the one one direction. direction.

[0245]

[0245] First, the position First, the positionofof each each of of thethe pin pin 182 182 at at the time of the time ofthe thecartridge cartridge (B)(B) moving moving fromfrom the the predetermined predetermined position will position will be be described. described. After Afterthe theimage imageformation formation 30 30 finishes,as finishes, aswill willbe beapparent apparentfrom fromthe theforegoing foregoingdescription, description,

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the pin 182 the pin 182 is ispositioned positionedat at anyany twotwo of the of the entering entering or or entrance portions entrance portions150k1-150k4 150k1-150k4 (Figure (Figure 6) .6). And,And, the 155 the pin pinis155 is positionedin positioned inthe theopening opening 150g1 150g1 or or 150g2. 150g2.

[0246]

[0246] The description The descriptionwill willbebe made made with with respect respect to the to the 5 5 operation ofdisengaging operation of disengagingthethe coupling coupling 150 150 fromfrom the drive the drive shaft shaft 2024200580

180 in interrelation 180 in interrelationwith with thethe operation operation of switching of switching to the to the next developing next developingcartridge cartridge B after B after the the image image forming forming operation operation using the using the cartridge cartridgeisis completed. completed.

[0247]

[0247] In the state In the statewhere wherethe the rotation rotation forfor the the 10 10 developmentshaft development shaft153 153 hashas stopped, stopped, the the axisaxis L2 isL2 is substantially co-axial substantially co-axial relative relative to to the the axisaxis L1the L1 in in coupling the coupling 150 150 (rotational (rotational force force transmitting transmitting angular angular position). And, position) And, the the developmentshaft development shaft153 153 moves moves in in the the dismounting dismounting direction direction X6 with X6 with the thecartridge cartridge (B), (B), andand thethe receiving receiving surface surface 150f 150f or or 15 15 the projection150d the projection 150dinin thethe upstream upstream withwith respect respect to the to the rotational directionofof rotational direction the the rotary rotary is brought is brought into into contact contact to to the free end the free endportion portion180b 180b of of thethe drive drive shaft shaft 180the 180 or or pin the pin 182 182 (Figure (Figure 25a). And, 25a) And, the the axis axis L2L2 begins begins toto incline incline toward toward the upstreamwith the upstream withrespect respect to to thethe rotational rotational direction direction X4 X4 20 20 (Figure 25 (b) (Figure 25 (b)). This direction ) . This directionofofinclination inclination is is the the opposite fromthat opposite from thatofofthe the inclination inclination of the of the coupling coupling 150 at 150 at the time of the time ofthe theengagement engagement of of thethe coupling coupling 150 150 with with the drive the drive shaft shaft 180, 180, with with respect respect toto the the development developmentaxis axis 153. It 153. It moves, while moves, whilethe theupstream upstream free free endend portion portion 150A2 150A2 with with respect respect 25 25 to the rotational to the rotationaldirection direction X4 X4 is is kept kept in contact in contact with with the the free end portion free end portion180b 180bbyby thethe rotational rotational operation operation of the of the rotary rotary C. And, C. And, inin the the axis axis L2, L2, the the upstream upstream free free endend portion portion 150 A3 inclines 150 A3 inclinestotothe the free free endend 180b3 180b3 of the of the drivedrive shaftshaft (Figure 25 (c) (Figure 25 (c)). And, in ) . And, in this thisstate, state, the the coupling coupling 150 150 is is 30 30 passed by passed by the the drive drive shaft shaft 180, 180, contacting contacting to to the the free free end end 180b3 (Figure 180b3 (Figure 25 25 (d) (d)). ) .

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[0248]

[0248] Thus, the coupling Thus, the coupling150 150 moves moves from from the the rotation rotation of of for transmittingangular for transmitting angular position position to to the the disengagement disengagement of of angular position,SOsothat angular position, that a part a part (upstream (upstream free-end free-end portion portion 150A2) of the 150A2) of thecoupling coupling150 150 positioned positioned upstream upstream of drive of the the drive 5 5 shaft 180 with shaft 180 withrespect respecttoto thethe rotational rotational direction direction X4 isX4 is permitted to permitted to circumvent circumvent the the drive drive shaft shaft 180. 180. Therefore, Therefore,the the 2024200580

cartridge cartridge BB moves movesininaccordance accordance with with the the rotation rotation of the of the rotary rotary C C to to the the position position of of shown shown in in Figure Figure 21. 21. InIn addition, addition, before before the completion the completion of of the one-full the one-full rotation rotation of of the the rotary rotary 10 10 C,the C, thecoupling coupling150150(the (theaxis axisL1) L1)inclines inclinestoward towarddownstream downstream with respect with respecttotoa arotational rotational direction direction X4 an X4 by byunshown an unshown means. means. In other words, In other words,the thecoupling coupling 150150 moves moves fromfrom the the disengagement disengagement angular angular position position to to the the pre-engagement pre-engagement angular angular position. By position. By this, afterthe this, after therotary rotary C completes C completes its its one-full one-full rotation, rotation, the the 15 15 coupling 150isisininthe coupling 150 the state state engageable engageable withwith the drive the drive shaftshaft 180. 180.

[0249]

[0249] As will As will be beapparent apparentfrom from thethe foregoing foregoing description,the description, theangle angle of of thethe pre-engagement pre-engagement angular angular position position the coupling150 the coupling 150relative relativeto to thethe axis axis L1 larger L1 is is larger than than the the 20 angleof 20 angle ofthe thedisengaging disengagingangular angularposition. position.This Thisis is because because it it is preferablethat is preferable thatthe thepre-engagement pre-engagement angular angular position position is set is set beforehand such beforehand suchthat thatduring during thethe engagement engagement operation operation of the of the coupling, thedistance coupling, the distance between between thethe upstream upstream free-end free-end the the position 150A1 position 150A1with withrespect respect to to thethe rotational rotational direction direction X4 and X4 and 25 25 the free-end180b3 the free-end 180b3ofofthe the drive drive shaft shaft is relatively is relatively longer longer (Figure 22b).. This (Figure 22b) Thisisisdone done in in consideration consideration of the of the dimensional dimensional tolerance tolerance ofof the the parts. parts. OnOnthe thecontrary, contrary,at atthe the time of the time of thecoupling couplingdisengagement, disengagement,the the axisaxis L2 inclines L2 inclines in in interrelation withthe interrelation with therotation rotation of of the the rotary rotary C position. C position. 30 30 Therefore, thedownstream Therefore, the downstream pre-end pre-end portion portion 150A2 150A2 of the of the coupling 150A3A3moves coupling 150 movesalong along thethe free free end end portion portion 180b3180b3 the the drive drive shaft. In shaft. Inother otherwords, words,the thedownstream downstreamfree-end free-endposition position 180A2 180A2 with respect with respecttotothe the rotational rotational direction direction X4 the X4 and and free the free

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end portion end portion180b3 180b3are are substantially substantially aligned aligned withwith each each otherother in in a directionof a direction ofthe theaxis axis L1 L1(Figure (Figure 25 25 (c)(c)). ) . InIn addition, addition, whenwhen the coupling150 the coupling 150disengages disengages from from thethe drivedrive shaft shaft 180, 180, the the disengagement disengagement isispossible possible irrespective irrespective of the of the phase phase difference difference 5 5 between the between thecoupling coupling150150 andand thethe pin pin 182.182. 2024200580

[0250]

[0250] As shown As shown in inFigure Figure22, 22, in in thethe rotational rotational force force transmitting angularposition transmitting angular position of of thethe coupling coupling 150, 150, the angle the angle relative to the relative to theaxis axisL1L1 of of thethe coupling coupling 150 150 is such is such that that in in the state where the state wherethe thecartridge cartridge (B)(B) is mounted is mounted to the to the 10 10 predeterminedposition predetermined positionof of thethe apparatus apparatus mainmain assembly assembly (A) (the (A) (the position opposed position opposedtotothe the photosensitive photosensitive drum), drum), , thethe coupling coupling 150 150 receives thetransmission receives the transmissionof of thethe rotational rotational force force from from the the drive shaft drive shaft180, 180,and anditit rotates. rotates.

[0251]

[0251] In addition,the In addition, thepre-engagement pre-engagement angular angular position position of of 15 thecoupling 15 the coupling150 150isisthe theangular angularposition positionimmediately immediatelybefore before the coupling150 the coupling 150isisbrought brought into into engagement engagement withwith the drive the drive shaft 180 in shaft 180 inthe theprocess process of of mounting mounting operation operation to the to the predeterminedposition predetermined positionin in accordance accordance withwith the the rotation rotation of the of the rotary C. rotary C.

20 20 [0252]

[0252] In addition,the In addition, thedisengaging disengaging angular angular position position of the of the coupling 150isisthe coupling 150 theangular angular position position relative relative to axis to the the axis L1 L1 of the coupling of the coupling150 150atat the the time time of of the the disengagement disengagement of the of the cartridge (B)from cartridge (B) fromthe the drive drive shaft shaft 180,180, in the in the process process of the of the cartridge cartridge BBmoving movingfrom from the the predetermined predetermined position position in in accordancewith 25 accordance 25 withthe therotation rotationofofthe therotary rotaryC.C.

[0253]

[0253] In the pre-engagement In the pre-engagementangular angular position position or the or the disengaging angularposition, disengaging angular position, thethe angles angles beta2 beta2 and beta3 and beta3 which which the axis L2 the axis L2makes makeswith withthethe axis axis L1 L1 are are larger larger than than the angle the angle beta1 which betal whichthe theaxis axisL2L2 makes makes with with the the axisaxis L1the L1 in in the 30 30 rotational rotational force force transmitting transmitting angular angular position. As for position. As for the the

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angle angle theta theta 1, 1, 0 0 degree degree is is preferable. However,in preferable. However, inthis this embodiment, ifthe embodiment, if theangle angle beta1 betal is is less less thanthan about about 15 degrees, 15 degrees, the smooth transmission the smooth transmissionof of thethe rotational rotational force force is is accomplished. This accomplished. Thisisisalso alsooneoneof ofthe theeffects effectsof ofthis this 5 5 embodiment. As embodiment. Asfor forthe theangles anglesbeta2 beta2and andbeta3, beta3,the therange rangeof of about 20 -- 60 about 20 60degrees degreesisis preferable. preferable. 2024200580

[0254]

[0254] As has As has been beendescribed described hereinbefore, hereinbefore, the the coupling coupling is is pivotably pivotably mounted mounted to to the the axis axis L1. And, the L1. And, the coupling coupling 150 150 inclines in accordance inclines in accordancewith with thethe rotation rotation of the of the rotary rotary C C 10 10 without interfering without interferingwith with thethe drive drive shaft. shaft.

[0255]

[0255] Here, accordingtotothe Here, according the above-described above-described embodiment of embodiment ofthe thepresent present invention, invention, eveneven if cartridge if the the cartridge B B (developing roller110) (developing roller 110)moves moves in in response response to the to the movement movement of of the rotary CCininone the rotary onedirection direction which which is substantially is substantially 15 15 perpendicularto perpendicular tothe thedirection directionofofthe theaxis axisL3 L3of ofthe thedrive drive shaft 180, the shaft 180, thedrum drumcoupling coupling member member 150 150 can can accomplish accomplish the the coupling (engagement)and coupling (engagement) and thethe disengagement disengagement relative relative to the to the drive shaft drive shaft 180. 180. This Thisis isbecause becausethethedrum drumcoupling couplingmember member150 150 according toananembodiment according to embodimentof of thethe present present invention invention can take can take 20 20 the rotationalforce the rotational forcetransmitting transmitting angular angular position, position, the pre- the pre- engagement angularposition, engagement angular position, andand thethe disengaging disengaging angular angular position. position.

[0256]

[0256] Here, as has Here, as hasbeen beendescribed described hereinbefore, hereinbefore, the the rotational forcetransmitting rotational force transmitting angular angular position position is angular is the the angular positionofofthe 25 position 25 thedrum drumcoupling couplingmember member150 150for fortransmitting transmittingthe the rotational force rotational forcefor forrotating rotating thethe developing developing roller roller 110 110 to to the the developing roller110. developing roller 110.

[0257]

[0257] The pre-engagementangular The pre-engagement angular position position is the is the position inclined position inclinedfrom from the the rotational rotational force force transmitting transmitting 30 30 angular position,and angular position, andwhich which is is thethe angular angular position position of the of the

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drum couplingmember drum coupling member150 150 before before thethe drumdrum coupling coupling member member 150 150 engages with engages withthe therotational rotational force force applying applying portion. portion.

[0258]

[0258] The disengagingangular The disengaging angular position position is is the the position position which is which is inclined inclinedaway away from from thethe pre-engagement pre-engagement angular angular 5 5 position from position fromthe therotational rotational force force transmitting transmitting angular angular 2024200580

position and position and which which is is the the angular angular position position of of the the drum drum coupling member150 coupling member 150for for the the drum drum coupling coupling member member 150 to 150 to disengage from disengage fromthe thedrive drive shaft shaft 180. 180.

[0259]

[0259] In the above In the abovedescribed described description, description, at the at the timetime 10 10 of the disengagement, of the disengagement,thethe upstream upstream receiving receiving surface surface 150f 150f or or the upstreamprojection the upstream projection 150d 150d contacts contacts withwith the the free free end end portion 180b portion 180bofofthe thedrive drive shaft shaft 180180 in interrelation in interrelation with with the the rotation rotation of of the the rotary rotary C. C. ByBy this, this, it it has has been been described described that that the axis L2 the axis L2inclines inclinestoward toward thethe upstream upstream in the in the rotational rotational 15 15 direction direction X4. However,in X4. However, inthis thisembodiment, embodiment,this thisis isnot not inevitable. Forexample, inevitable. For example,aatoggle togglespring spring(elastic (elasticmaterial) material) is provided adjacent is provided adjacenttoto thethe rotary rotary fulcrum fulcrum of coupling. of the the coupling. And, the And, the structure structureisis such such that that at at the the timetime of coupling of the the coupling engagement, theurging engagement, the urging force force produces produces toward toward the downstream the downstream in in 20 20 the the rotational rotational direction direction X4 X4 relative relative to to the the coupling. coupling. AtAtthe the time of the time of thedisengagement disengagementof of thethe coupling, coupling, corresponding corresponding to to the rotationofofthe the rotation therotary rotary C, C, thethe urging urging force force is produced is produced toward the upstream toward the upstreaminin the the rotational rotational direction direction X4 toX4the to the coupling contrarilytoto coupling contrarily the the case case of of the the engagement engagement by the by the 25 25 function function of of this this toggle toggle spring. Therefore, at spring. Therefore, at the the time time of of the the coupling disengagement, coupling disengagement, the the upstream upstream receiving receiving surface surface 150f 150f or or the projection150d the projection 150dinin the the rotational rotational direction direction X4, the X4, and and the free end portion free end portion180b 180bofof the the drive drive shaft shaft 180 180 are are not contacted not contacted to each other, to each other,and andthe the coupling coupling disengages disengages fromfrom the drive the drive 30 30 shaft. shaft. InInother otherwords, words,as aslong longasasthe theaxis axisL2 L2of ofthe thecoupling coupling 150 inclinesininresponse 150 inclines responseto to thethe rotation rotation of the of the rotary rotary C, any C, any means is means is usable. usable. In Inaddition, addition,by bythe thetime timeimmediately immediatelybefore before

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the coupling150 the coupling 150engages engages with with thethe drive drive shaft shaft 180, 180, the the coupling is inclined coupling is inclinedSOso that that thethe driven driven portion portion 150a 150a of the of the coupling facestoward coupling faces towardthe the downstream downstream in the in the rotational rotational direction direction X4. Inother X4. In otherwords, words,the thecoupling couplingisisbeforehand beforehand 5 5 placedininthe placed thestate stateofofthe thepre-engagement pre-engagementangular angularposition. position. For this purpose, For this purpose,any anymeans means in in Embodiment Embodiment 2 et2 seqq et seqq is usable. is usable. 2024200580

[0260]

[0260] Here, referring Here, referringtotoFigure Figure 26,26, thethe description description will be will be made madeabout aboutreduction reduction of of thethe timetime which which the image the image formation (development) formation (development) requires requires in in the the present present embodiment. embodiment. 10 10 Figure 26 Figure 26 is isa atiming timing chart chart showing showing the the rotation rotation of the of the developing roller developing rollerand and SOso on.on.

[0261]

[0261] Here, with Here, with reference referencetoto Figure Figure 26,26, reduction reduction in in time requiredfor time required forimage image formation formation (development) (development) in this in this embodiment will embodiment will be be described. described. Figure Figure26 26isisaatiming timingchart chartfor for 15 15 illustrating rotationofof illustrating rotation thethe developing developing roller roller and like. and the the like.

[0262]

[0262] In Figure 26, In Figure 26,timings timingsofof rotation rotation andand stopstop of of the developingroller the developing rollerfrom from a state a state in which in which the the developing developing apparatus (cartridge)isis apparatus (cartridge) in in a home a home position position until until the the developing rollerreceives developing roller receives an an image image formation formation start start signal signal to to 20 20 effect development effect developmentfor for first first color color (yellow (yellow image image formation) formation) and developmentfor and development fora asecond second color color (magenta (magenta image image formation). formation) . With respect With respecttotosubsequent subsequent developments developments for for third third and fourth and fourth colors (cyanimage colors (cyan imageformation formation andand black black image image formation), formation), illustration isomitted illustration is omitted due due to to redundant redundant explanation. explanation.

25 25 [0263]

[0263] In this embodiment, In this embodiment,asas described described above, above, the the engaging operationbetween engaging operation betweenthethe driving driving shaft shaft 180 the 180 and and the coupling 150isiscompleted coupling 150 completed during during thethe rotation rotation of rotary of the the rotary C C or immediatelyafter or immediately afterthe the stop stop of of thethe rotation rotation of rotary of the the rotary C. C. During or immediately During or immediatelyafter after thethe stop stop of the of the rotation rotation of the of the 30 30 rotary C, the rotary C, theengaging engaging operation operation of of the the coupling coupling 150 with 150 with the the

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driving shaft driving shaft 180 180 isis completed. completed. Then, Then,the thedeveloping developingroller roller 110 is placed 110 is placedinina arotatable rotatable state state or rotated. or is is rotated.

[0264]

[0264] That is, That is, in inthe thecase casewhere where thethe driving driving shaft shaft 180 180 has already has alreadybeen beenrotated rotated before before thethe coupling coupling 150 goes 150 goes into into an an engagingoperation 5 engaging 5 operationwith withthe thedriving drivingshaft shaft180, 180,the thecoupling coupling 2024200580

150 starts rotation 150 starts rotationsimultaneously simultaneously with with the the engagement engagement with with the the driving driving shaft shaft 180. Then,the 180. Then, thedeveloping developingroller roller110 110starts starts rotation. Further,in rotation. Further, inthe thecase casewhere wherethe thedriving drivingshaft shaft180 180is is stopped, thecoupling stopped, the coupling150 150 is is stopped stopped without without being being rotated rotated 10 10 even when even when the theengagement engagementof of thethe coupling coupling 150 150 with with the driving the driving shaft shaft 180 180 is is completed. Whenthe completed. When thedriving drivingshaft shaft180 180starts starts rotation, rotation, the the coupling coupling 150 150 starts starts rotation. Then, the rotation. Then, the developing roller110 developing roller 110starts starts rotation. rotation.

[0265]

[0265] In either case, In either case,according accordingto to this this embodiment, embodiment, a a 15 mainassembly-side 15 main assembly-siderotating rotatingforce forcetransmitting transmittingmember member(e.g., (e.g., the main assembly-side the main assembly-side coupling) coupling) is is not not required required to betomoved be moved forward and back forward and backininthe the axial axial line line direction. direction.

[0266]

[0266] In this embodiment, In this embodiment,the the driving driving shaft shaft 180 180 has has already been already beenrotated rotatedbefore beforethethe coupling coupling 150 150 goes goes into into the the 20 20 engaging engaging operation operation with with the the driving driving shaft shaft 180. Accordingly, 180. Accordingly, image image formation formation can can be be started started quickly. Therefore, compared quickly. Therefore, compared with the with the case casewhere wherethe the driving driving shaft shaft 180 180 is stopped, is stopped, the time the time required forimage required for imageformation formation cancan be be further further reduced. reduced.

[0267]

[0267] Further, in Further, inthis thisembodiment, embodiment, in in thethe rotating rotating 25 25 state of the state of thedriving drivingshaft shaft 180, 180, thethe coupling coupling 150 be 150 can can be disconnectedfrom disconnected fromthe the driving driving shaft shaft 180.180.

[0268]

[0268] Accordingly,ininthis Accordingly, thisembodiment, embodiment, thethe driving driving shaft 180 may shaft 180 mayalso alsonot not bebe rotated rotated or stopped or stopped in order in order that that the the

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coupling 150isisengaged coupling 150 engaged with with or or disengaged disengaged fromfrom the driving the driving shaft. shaft.

[0269]

[0269] That is, That is, according accordingtoto the the coupling coupling 150 150 in this in this embodiment, thecoupling embodiment, the coupling150150 cancan be be engaged engaged withwith and and 5 5 disengaged from disengaged fromthe thedriving driving shaft shaft 180, 180, irrespective irrespective of the of the 2024200580

rotation rotation or or stop stop of of the the driving driving shaft shaft 180. This is 180. This isalso alsoone one of the remarkable of the remarkableeffects effects of of this this embodiment. embodiment.

[0270]

[0270] Thereafter, stepsofofrotary Thereafter, steps rotary (developing (developing roller) roller) contact, yellowimage contact, yellow imageformation, formation, rotary rotary (developing (developing roller) roller) 10 10 separation, anddeveloping separation, and developing roller roller rotation rotation stopstop are performed are performed in in this this order. Simultaneously with order. Simultaneously with the the start start of of rotation rotation of of the rotary,aadisengaging the rotary, disengaging operation operation of the of the coupling coupling of the of the cartridge fromthe cartridge from thedriving driving shaft shaft of of the the apparatus apparatus main main assembly isperformed assembly is performedtoto prepare prepare forfor a developing a developing operation operation 15 15 for the second for the secondcolor. color.

[0271]

[0271] That is, That is, in inthis thisembodiment, embodiment, thethe engaging engaging and and disengagingoperation disengaging operationofof thethe coupling coupling can can be performed be performed in in interrelation interrelation with with the the rotation rotation of of the the rotary. Accordingly, rotary. Accordingly, it is possible it is possibletotoshorten shorten a necessary a necessary timetime interval interval between between 20 20 the first color the first colordevelopment developmentandand thethe second second color color development. development. Similarly, timeintervals Similarly, time intervals between between thethe second second color color development development and the third and the thirdcolor colordevelopment, development, between between the the third third colorcolor development andthe development and thefourth fourth color color development, development, between between the home the home position and position andthe thefirst first color color development, development, and and between between the the 25 25 fourth colordevelopment fourth color developmentandand thethe home home position position can also can also be be reduced. Accordingly, aa time reduced. Accordingly, time required required for for obtaining obtaining aa color color image image on on a a sheet sheet can can be be reduced. This is reduced. This is also also one one of of the the remarkable effectsofofthis remarkable effects this embodiment. embodiment.

[0272]

[0272] Referring to Referring to Figure Figure 27 27 and and Figure Figure 28, 28, a a modified modified 30 exampleof 30 example ofthe thedevelopment developmentshaft shaftwill willbe bedescribed. described.Figure Figure 27 27

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is is aa perspective perspectiveviewviewofof members members around around the the development development shaft. shaft. Figure Figure 2828 illustrates illustratesa a characteristic characteristic portion portion in Figure in Figure 27. 27.

[0273]

[0273] In the foregoing In the foregoingdescription, description,thethe free free end end of of the developmentshaft the development shaftisis a spherical a spherical surface, surface, and coupling and the the coupling 5 5 is is contacted contacted to to the the spherical spherical surface surface thereof. However, as thereof. However, as 2024200580

shown in Figure shown in Figure2727(a) (a) and and 28 28 (a)(a), the , the free free endend 1153b 1153b of the of the development development shaft shaft 1153 1153 may may be be planate. planate. AnAn edge edge portion portion 1153c 1153c of of aa peripheral peripheralsurface surface thereof thereof contacts contacts to the to the coupling coupling 150 150 to to rotate rotate the the coupling coupling 150. Even with 150. Even with such such aa structure, structure, the the 10 10 axis axis L2 L2 is is assuredly assuredly pivotable pivotable relative relative toto the the axis axis L1. L1. InIn addition, theprocessing addition, the processingto to thethe spherical spherical surface surface is is unnecessary. Forthis unnecessary. For thisreason, reason,the thecost costcan canbe bereduced. reduced.

[0274]

[0274] In the foregoing In the foregoingdescription, description, another another drive drive transmission transmission pin pin is is fixed fixed to to the the development development shaft. However, shaft. However, 15 asshown 15 as shownininFigure Figure2727(b) (b)and and2828(b) (b), it may , it may be be separate separate member from member from the the elongated elongated development development shaft. shaft. A Afirst first development shaft1253A development shaft 1253A is is a member a member for for supporting supporting a rubber a rubber portion of portion of the thedeveloping developing roller roller (unshown). (unshown) In addition, . In addition, a a second developmentshaft second development shaft 1253B 1253B is is provided provided co-axially co-axially with with the the 20 20 first developmentshaft first development shaft 1253A, 1253A, andand has has integrally integrally a riba for rib for the drive transmissions the drive transmissions forfor engaging engaging withwith the the coupling coupling 150 150 1253Bc. 1253Bc. InIn this this case, case, geometrical geometrical latitude latitude isis enhanced enhanced by by an an integral integral moldings moldings using using injection injection molding molding and and so SO on. For this on. For this reason, reason, the the rib rib part part 1253Bc 1253BC can can be be enlarged. Therefore, the enlarged. Therefore, the areaofofthe 25 area 25 thedrive drivetransmitting transmittingportion portion1253Bd 1253Bdcancanbebe increased. Even if increased. Even if it it is is aa development development shaft shaft made made of ofresin resin material, it material, it can can transmit transmit the the torque torque assuredly. assuredly. In Inthe the Figure, whenthe Figure, when thecoupling coupling 150150 rotates rotates in the in the direction direction of X8,of X8, the drive transmission the drive transmission surface surface 150h 150h of the of the coupling coupling contacts contacts 30 30 to the drive to the drivetransmitting transmitting portion portion 1253Bd 1253Bd of the of the second second drivedrive shaft. When the shaft. When the contact contact area area is is wide wide at at this this time, time, aa stress stress applied applied on on the the rib rib 1253Bc 1253Bc is is small. Therefore,the small. Therefore, theliability liability

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of of the the damage damage of of the the coupling coupling and and so SO on on isis mitigable. mitigable. InIn addition, thefirst addition, the firstdevelopment development shaft shaft may may be simple be the the simple metal metal shaft, and the shaft, and thesecond seconddevelopment development shaft shaft may may beintegrally be an an integrally molded product molded product of of the the resin resin material. material. In Inthis thiscase, case,the thecost cost 5 5 reduction isaccomplished. reduction is accomplished. 2024200580

[0275]

[0275] As shown As shown in in Figure Figure 27 27 (c) (c) and and 28 28 (c) (c),the the opposite ends1355a1, opposite ends 1355a1,1355a2 1355a2of of thethe rotational rotational forceforce transmitting pin(rotational transmitting pin (rotational force force receiving receiving portion) portion) 1355 1355 are are fixed by press-fitting fixed by press-fittingand and SO so on on beforehand beforehand intointo the drive the drive 10 10 transmission holes1350g transmission holes 1350g 1 or 1 or 1350g2 1350g2 of the of the coupling coupling 1350.1350. Thereafter, thedevelopment Thereafter, the development shaft shaft 1353 1353 which which has free has the the free end end portion 1353c1, portion 1353c1,1353c2 1353c2 formed formed into into the the shape shape of a of a slot slot may be may be inserted. inserted. AtAt this this time, time, it it is is preferable preferable that, that, the the engaging engaging portion 1355b portion 1355bofofthe thepin pin 1355 1355 relative relative to the to the free free end portion end portion 15 15 (unshown) of the (unshown) of thedevelopment development shaft shaft 1353 1353 is formed is formed into into a a spherical spherical shape shape so SO that thecoupling that the coupling1350 1350is ispivotable. pivotable.ByBy fixing the pin fixing the pin1355 1355ininthis this manner manner beforehand, beforehand, it isitnot is not necessary to necessary toincrease increasethethe size size of of the the standby standby hole hole 1350g1350g of of the the coupling coupling 1350 1350 more more than than needed. Therefore,the needed. Therefore, therigidity rigidity 20 20 of the coupling of the couplingisisenhanced. enhanced.

[0276]

[0276] In addition,in In addition, inthe theforegoing foregoing description, description, the the inclination ofthe inclination of theaxis axis of of thethe coupling coupling follows follows the the development development shaft shaft free-end. However,as free-end. However, asshown shownininFigures Figures2727 (d), 27 (e) (d), 27 (e),, and 28 (d) and 28 (d),itit may may follow follow the the contact contact surface surface 25 25 1457a of the 1457a of thebearing bearingmember member 1457 1457 co-axially co-axially withwith the the development development shaft shaft 1453. 1453. InInthis thiscase, case,the thefree freeend endsurface surface 1453b of the 1453b of thedevelopment development shaft shaft 1453 1453 is the is at at the levellevel comparable comparable as as the the end end surface surface of of the the bearing bearing member. And,the member. And, therotational rotational force transmittingpin force transmitting pin (rotational (rotational force force receiving receiving portion) portion) 30 30 1453c projectedfrom 1453c projected fromthe the free free endend surface surface 1453b 1453b is inserted is inserted into the inside into the insideofofthe theopening opening 1450g 1450g of the of the coupling coupling 1450.1450. The rotational The rotationalforce forceisis transmitted transmitted by this by this pin 1453c pin 1453c

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contacting tothe contacting to therotational rotational force force transmitting transmitting surface surface (rotational forcetransmitting (rotational force transmitting portion) portion) 1450h 1450h of coupling. of the the coupling. In this manner, In this manner,the thecontact contact surface surface 1457a 1457a at time at the the time of the of the inclination ofthe inclination of thecoupling coupling 1450 1450 is is provided provided on supporting on the the supporting 5 5 member 1457. member 1457. By Bythis, this,there thereisisno nonecessity necessityofofprocessing processingthe the developmentshaft development shaftdirectly, directly, andand thethe machining machining cost cost can be can be 2024200580

reduced. reduced.

[0277]

[0277] In addition,similarly, In addition, similarly, the the spherical spherical surface surface at at the free end the free endmay maybebea amolded molded resin resin part part which which is a is a separate separate 10 member.In In 10 member. this this case, case, the the machining machining cost cost of of thethe shaft shaft can can be be reduced. This is reduced. This is because because the the configuration configuration ofof the the shaft shaft processed by processed by cutting cutting and and SO so on on can can be be simplified. simplified. In In addition, addition, aarange rangeofofthe the spherical spherical surface surface of shaft of the the shaft free- free- end may end may be be narrowed, narrowed,and and thethe machining machining costcost mayreduced may be be reduced by by 15 15 limiting therange limiting the rangewhich which requires requires highly highly precise precise processing. processing.

[0278]

[0278] Referring to Referring toFigure Figure29, 29, thethe description description willwill be be made made about a about a modified modified example example of of the the drive drive shaft. shaft. Figure Figure29 29 is a is a perspectiveview perspective viewofof drive drive shaft shaft and and development development driving driving gear. gear.

20 20 [0279]

[0279] Similarly Similarly totothe thedevelopment development shaft, shaft, it is it is possible to possible toform formthe thefree free endend of of the the drive drive shaft shaft 1180 1180 into into a a flat flat surface surface 1180b 1180b as as shown shown inin Figure Figure 2929 (a) (a). . ByBy this, this, the the configuration configuration ofofthe theshaft shaftis is simple, simple, and and the the machining machining cost cost can can be be reduced. reduced. AApin pin(rotational (rotationalforce forceapplying applyingportion) portion)is is 25 25 designated bythe designated by thereference reference numeral numeral 1182. 1182.

[0280]

[0280] In addition,similarly In addition, similarlytoto thethe development development shaft, shaft, the drive transmitting the drive transmitting portion portion 1280c1, 1280c1, 1280c2 1280c2 may be may be integrally moldedwith integrally molded withthe the drive drive shaft shaft 12801280 as shown as shown in Figure in Figure 29 (b).. When 29 (b) Whenthe thedrive drive shaft shaft is is a molded a molded resin resin part,part, the the

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drive transmitting drive transmittingportion portion cancan be be molded molded as integral as an an integral part. part. Therefore, thecost Therefore, the costreduction reduction cancan be accomplished. be accomplished.

[0281]

[0281] As shown As shown inin Figure Figure 29 29 (c) (c),ininorder ordertotonarrow narrow the range of the range ofthe thefree freeend end portion portion 1380b 1380b of the of the drivedrive shaftshaft 5 5 1380, an outer 1380, an outerdiameter diameterof of thethe shaft shaft freefree end end 1380c 1380c may be may be 2024200580

decreased decreased than than the the outer outer diameter diameter of of aa main main part part 1380a. The 1380a. The free end portion free end portion1380b 1380brequires requires degree degree of accuracy, of accuracy, in order in order to determinethe to determine theposition positionof of thethe coupling coupling (unshown) (unshown) as as described above. described above. For Forthis thisreason, reason,the thesurface surfacewhich whichrequires requires 10 10 high degree high degreeofofaccuracy accuracycancan be be reduced reduced by limiting by limiting the the spherical rangeonly spherical range onlytoto thethe contact contact portion portion of coupling. of the the coupling. By this, By this, the the machining machining cost cost can can be be lowered. lowered. InInaddition, addition,the the unnecessary freeend unnecessary free endofof the the spherical spherical surface surface maycut may be be cut similarly. similarly.

15 15 [0282]

[0282] In addition,in In addition, inthe theforegoing foregoing embodiments, embodiments, in in the directionofofthe the direction theaxis axis L1,L1, there there is play is no no play between between the the developing developing roller roller and and the the apparatus apparatus main main assembly. Here,the assembly. Here, the positioning method positioning method of of the the developing roller developing roller will will be be described described with respect with respect to to the the direction direction of of the the axis axis L1 L1 as as to, to, when when play play 20 20 exists. Inother exists. In otherwords, words,the thecoupling coupling1550 1550is isprovided providedwith withaa tapered tapered surface surface 1550e, 1550e, 1550h. Asfor 1550h. As forthe thedrive driveshaft, shaft,aaforce force is is produced produced in in aa thrust thrust direction direction by by the the rotation. By this, rotation. By this, the couplingand the coupling andthe thedeveloping developing roller roller are are positioned positioned with with respect respect to to the the direction direction of of the the axis axis L1. Referring to L1. Referring to Figure Figure 25 25 30 30 and and Figure Figure 31, 31, this this will will be be described described inin detail. Figure 30 detail. Figure 30 is a perspective is a perspectiveview viewand and a top a top plan plan viewview of the of the coupling coupling alone. Figure alone. Figure3131is isananexploded explodedperspective perspectiveview viewof ofthe thedrive drive shaft, the development shaft, the development shaft, shaft, andand thethe coupling. coupling.

[0283]

[0283] As shown As shown in inFigure Figure3030 (b), (b) therotational , the rotational force force 30 30 receiving surface1550e receiving surface 1550e forms forms an an angle angle alpha alpha 5 relative 5 relative to the to the axis axis L2. Whenthe L2. When thedrive driveshaft shaft180 180rotates rotatesin inthe theT1 T1

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direction, the direction, thepin pin182 182 and and thethe receiving receiving surface surface 1550e1550e contact contact to to each each other. Then,aacomponent other. Then, componentforce forceis isapplied appliedininthe theT2 T2 direction to direction tothe thecoupling coupling 1550, 1550, andand the the coupling coupling is moved is moved in in the the T2 T2 direction. direction. In Inmore moredetail, detail,the thecoupling coupling1550 1550moves moves 5 5 until the until the driving drivingshaft shaft receiving receiving surface surface 1550f 1550f (Figure (Figure 31a) 31a) of the coupling of the coupling1550 1550contacts contactsto to thethe freefree end end 180b 180b of the of the 2024200580

drive shaft drive shaft 180. 180. ByBythis, this,the theposition positionwith withrespect respecttotothe the direction ofthe direction of theaxis axisL2L2 of of thethe coupling coupling 15501550 is determined. is determined. In addition,the In addition, thefree freeend end 180b 180b is is a spherical a spherical surface, surface, and the and the 10 10 driving shaft driving shaftreceiving receiving surface surface 1550f 1550f of the of the coupling coupling 1550 1550 is is a a conic conic surface. Forthis surface. For thisreason, reason,in inthe thedirection direction perpendiculartotothe perpendicular theaxis axis L2,L2, thethe position position of driven of the the driven portion 1550a portion 1550aofofthe thecoupling coupling 1550 1550 relative relative to drive to the the drive shaft shaft 180 is determined. 180 is determined.

15 15 [0284]

[0284] In In addition, addition, as as shown shown in in Figure Figure 30 30 (c), the (c) the rotational forcetransmitting rotational force transmitting surface surface (rotational (rotational forceforce transmitting portion)1550h transmitting portion) 1550h forms forms the the angle angle alpha alpha 6 relative 6 relative to to the the axis axis L2. Whenthe L2. When thecoupling coupling1550 1550rotates rotatesin inthe theT1 T1 direction, the direction, thetransmitting transmitting surface surface 1550h 1550h and and the 155 the pin pin 155 20 20 contact contact to to each each other. Then, aa component other. Then, component force force is is applied applied in in the T2 direction the T2 directiontotothe the pin pin 155, 155, andand the the pin pin is moved is moved in the in the T2 T2 direction. And,the direction. And, thedevelopment developmentshaft shaft153153moves movesuntil untilthe the free end 153b free end 153bofofthe thedevelopment development shaft shaft 153 153 contacts contacts to the to the development bearingsurface development bearing surface 1550i 1550i (Figure (Figure 31b)31b) of coupling of the the coupling 25 25 1550. By this, 1550. By this, the the position position of of the the development development shaft shaft 153 153 (developing roller)with (developing roller) withrespect respect to to thethe direction direction of axis of the the axis L2 is determined. L2 is determined.

[0285]

[0285] In addition,the In addition, thedevelopment development bearing bearing surface surface 1550i of the 1550i of thecoupling coupling1550 1550is is a conic a conic surface, surface, and free and the the free 30 30 end 153b end 153b ofofthe thedevelopment development shaft shaft 153 153 is the is the spherical spherical surface. For this surface. For this reason, reason, with with respect respect to to the the direction direction perpendiculartotothe perpendicular theaxis axis L2,L2, thethe position position of driving of the the driving

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portion 1550b portion 1550bofofthe thecoupling coupling 1550 1550 relative relative to development to development shaft 153 is shaft 153 isdetermined. determined.

[0286]

[0286] The taper angles The taper anglesalpha alpha 5 and 5 and alpha alpha 6 are 6 are selected so as selected SO astotobebesufficient sufficient forfor producing producing the force the force for for 5 5 moving the moving thecoupling couplingand and thethe developing developing roller roller in thrust in the the thrust 2024200580

direction. And, direction. And,the theangles anglesdiffer differdepending dependingononthe theload. load. However, if However, ifother othermeans means forfor determining determining the the position position of the of the thrust directionisisprovided, thrust direction provided, thethe taper taper angles angles alphaalpha 5 and5 and alpha alpha 66 may maybe besmall. small.

10 10 [0287]

[0287] For this reason, For this reason,asashas has been been described described hereinbefore,the hereinbefore, thecoupling couplingis is provided provided withwith the taper the taper for for producing the producing theretracting retracting force force in in the the direction direction of axis of the the axis L2, and L2, and with withthe theconic conic surface surface forfor determining determining the position the position in in the the direction direction perpendicular perpendicular toto the the axis axis L2. Bythis, L2. By this,the the 15 15 position in position in the the direction direction of of the the axis axis L2 L2 of of the the coupling coupling and and the positionininthe the position thedirection direction perpendicular perpendicular to axis to the the axis can be can be determined determined simultaneously. simultaneously. In Inaddition, addition,further furtherassured assured transmission ofthe transmission of therotational rotational force force can can be accomplished. be accomplished. This will This will be be described. described. When Whenthe therotational rotationalforce forcereceiving receiving 20 20 surface or the surface or therotational rotational force force transmitting transmitting surface surface of the of the coupling isnot coupling is notgiven giventhe the taper taper angle angle which which has has been been described described above, the above, the rotational rotational force force transmitting transmitting surface surface or the or the rotational forcereceiving rotational force receiving surface surface of the of the coupling coupling inclines inclines due to due to influence influenceand andSOso on on of of dimensional dimensional tolerance, tolerance, and the and the 25 25 component forceisisproduced component force produced in in thethe direction direction (opposite (opposite direction to direction to T2 T2 of of Figure Figure 30) 30) of of the the axis axis L2. L2. By Bythis, this,the the contact betweenthe contact between therotational rotational force force receiving receiving surface surface and the and the rotational forcetransmitting rotational force transmitting surface surface of the of the drive drive transmission transmission pin pin and and the the coupling coupling isis disturbed. However,with disturbed. However, with 30 30 the above described the above describedstructure, structure, such such the the problem problem is avoidable. is avoidable.

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[0288]

[0288] However, it However, itisisnot notinevitable inevitable that that the the coupling coupling is provided with is provided withboth bothsuch such thethe retracting retracting taper taper and the and the positioning conic positioning conic surface. surface. For Forexample, example,ininplace placeofofthe thetaper taper for pulling in for pulling inthe thedirection direction of of thethe axisaxis L2, L2, a part a part for urging for urging 5 5 in in the the direction direction ofof the the axis axis L2 L2 may may be be added. From now added. From now on, on, as as long as there long as thereisisnonoparticular particular description, description, the the case case wherewhere 2024200580

both the both the tapered taperedsurface surfaceandand thethe conic conic surface surface are formed are formed will will be described. be described.

[0289]

[0289] Referring to Referring toFigure Figure32, 32, thethe description description willwill be be 10 10 madeabout made aboutthe themeans meansfor forregulating regulatingthe thedirection directionof ofthe the inclination ofthe inclination of thecoupling coupling relative relative to the to the cartridge cartridge for the for the engagement betweenthe engagement between the coupling, coupling, andand the the drive drive shaftshaft of the of the apparatus apparatus main main assembly. Figure32 assembly. Figure 32is isaaside sideview view illustrating illustrating aamajor majorpart part of of thethe driving driving sideside of the of the 15 15 cartridge, andFigure cartridge, and Figure3333 is is a sectional a sectional viewview taken taken alongalong S7-S7 S7-S7 of Figure 32. of Figure 32.

[0290]

[0290] Here, in Here, in order ordertotoregulate regulate thethe inclining inclining direction of direction ofthe thecoupling coupling 150150 relative relative to the to the cartridge cartridge B, the B, the supporting member(mounting supporting member (mounting member) member) 15571557 is provided is provided with with a a 20 20 regulating regulating portion portion 1557h 1557h 11 or or 1557h2. This regulating 1557h2. This regulating portion portion 1557h 1557h 11 or or 1557h2 1557h2isisprovided provided SO so that that it becomes it becomes substantially substantially parallel to parallel tothe therotational rotational direction direction X4 immediately X4 immediately before before the the coupling coupling engages engages with with the the drive drive shaft shaft 180. 180. In Inaddition, addition,thethe intervals D7thereof intervals D7 thereofisis slightly slightly larger larger thanthan outerouter diameter diameter of of 25 25 the driving the driving portion portion 150b 150b of of the the coupling coupling 150 150 phi phi D6. D6. By Bythis, this, the coupling150 the coupling 150isispivotable pivotable in in thethe rotational rotational direction direction X4. X4. In addition,the In addition, thecoupling couplingis is pivotable pivotable in all in all the directions the directions relative relative to to the the development development shaft. For this shaft. For this reason, reason, irrespective ofthe irrespective of thephase phase of of thethe development development shaft, shaft, the the 30 30 coupling canbebeinclined coupling can inclinedin in thethe regulated regulated direction. direction. Therefore, itbecomes Therefore, it becomeseasy easy to to insert insert the the drive drive shaftshaft (unshown) (unshown) into the insertion into the insertionopening opening 150m 150m forfor the the drive drive shaft shaft of the of the

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coupling coupling 150 150 much much more more assuredly. Therefore,they assuredly. Therefore, theyare aremore more assuredly engageable. assuredly engageable.

[0291]

[0291] In addition,ininthe In addition, theforegoing foregoing description, description, the the angle in the angle in thepre-engagement pre-engagement angular angular position position of coupling of the the coupling 5 5 150 relativetotothe 150 relative theaxis axis L1 L1 is is larger larger thanthan the the angleangle of the of the 2024200580

disengagingangular disengaging angularposition position (Figure (Figure 22, 22, Figure Figure 25) .25). However, However, this this is is not not inevitable. Referringto inevitable. Referring toFigure Figure34, 34,the the descriptionwill description willbebemade. made.

[0292]

[0292] Figure 34 is Figure 34 isa alongitudinal longitudinal sectional sectional viewview 10 10 for for illustrating illustrating the the mounting mounting process process of of the the coupling. coupling. AsAs shown in Figure shown in Figure35, 35,inin the the state state of of (a) (a) the the mounting mounting process process of of the the coupling coupling ininthe thedirection directionofofthe theaxis axisL1, L1,the the downstream free downstream freeend endposition position 1850A1 1850A1 withwith respect respect to the to the rotational directionX4X4 rotational direction is is closer closer to the to the direction direction of the of the 15 15 driving shaft182 driving shaft 182(the (the rotational rotational force force applying applying portion) portion) than than the the drive drive shaft shaft free free end end 180b3. 180b3. InInthe thestate stateof of(b), (b),the thefree free end position1850A1 end position 1850A1isis contacted contacted to to the the freefree end portion end portion 180b. 180b. At this At this time, time,the thefree free end end position position 1850A1 1850A1 moves moves toward toward the the developmentshaft development shaft153 153 along along thethe downstream downstream freefree end portion end portion 20 20 180b of the 180b of the drive driveshaft shaft 180 180 with with respect respect to the to the rotational rotational direction X4 direction X4 of of the the rotary. rotary. And, And,the thefree freeend endposition position1850A1 1850A1 passes by passes by the thefree freeend end portion portion 180b3 180b3 of the of the drive drive shaftshaft 180 at 180 at this position,the this position, thecoupling coupling 150150 takes takes the the pre-engagement pre-engagement angular position(Figure angular position (Figure 34 34 (c)(c)). And, ) . And, finally finally the the engagement engagement 25 25 between the between thecoupling coupling1850 1850 andand thethe drive drive shaft shaft 180 is 180 is established established (((rotational forcetransmitting (rotational force transmitting angular angular position) position) Figure 34 (d) Figure 34 (d)). When the ) . When thefree freeend end portion portion 1850A1 1850A1 passes passes by by the free end the free end180b3, 180b3,the the free free endend position position 1850A1 1850A1 is contacted is contacted to the free to the freeend end180b3, 180b3,oror is is positioned positioned in the in the development development 30 30 shaft (153) or shaft (153) ordeveloping developing roller roller side. side.

[0293]

[0293] An example An exampleofofthis thisembodiment embodiment will will be described. be described.

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[0294]

[0294] First, as shown First, as shownininFigure Figure 5, 5, thethe shaft shaft diameter diameter of the development of the developmentshaft shaft 153153 is is ΦZ1, $Z1, the the shaft shaft diameter diameter of the of the pin 155 pin 155 is is 22, ΦZ2,and andthe thelength lengthis isZ3. Z3.As As shown shown in in Figure Figure 6 6 (d), (e) and (d), (e) and (f) (f), the maximum , the maximumouter outerdiameter diameterof of thethe driven driven portion150a 5 portion 5 150aofofthe thecoupling coupling150150isisZ4ΦZ4 thethe diameter diameter of of a a phantom circle phantom circleC1C1(Figure (Figure 6(d)) 6 (d) whichforms ) which formsthethe inner inner ends ends of of 2024200580

the projections150d the projections 150d1 1 oror 150d 150d 2 or 2 or 150d3, 150d3, 150d4 150d4 is ΦZ5, is $25, and and the the maximum maximum outer outer diameter diameter of of the the driving driving portion portion 150b 150b is is ΦZ6. Z6. Referring to Referring toFigures Figures2222 andand 25,25, thethe angle angle formed formed between between the the 10 10 coupling 150and coupling 150 andthe theconic conic drive drive shaft shaft receiving receiving surface surface 150f 150f is α2, and is x2, and the theangle angleformed formed between between the the coupling coupling 150 the 150 and and the shaft shaft receiving receiving surface surface 150i 150i is is α1. al. AAshaft shaftdiameter diameterofofthe the drive shaft drive shaft 180 180 is is Z7, ΦZ7,the theshaft shaftdiameter diameterof ofthe thepin pin182 182is is ΦZ8, and $28, and the the length length is is Z9). Z9). In Inaddition, addition,the theangle anglerelative relative 15 15 to the axis to the axisL1 L1ininthe therotational rotational force force transmitting transmitting angular angular position is position is31, β1,the theangle anglein in thethe pre-engagement pre-engagement angular angular position is position is32, β2,and andthe the angle angle in in the the disengaging disengaging angular angular position is position is 33. β3. In Inthis thisexample, example,

[0295]

[0295] Z1= Z1= 8mm; Z2=2mm; 8mm; Z2= 2mm;Z3= Z3=12mm; 12mm;Z4= Z4=15mm; 15mm;Z5= Z5=10mm; 10mm;Z6= Z6= 20 20 19mm; Z7= 8mm; 19mm; Z7= 8mm;Z8= Z8=2mm; 2mm; Z9= Z9= 14mm 14mm ; α1= ; al= 70 degrees; 70 degrees; α2= 120 a2= 120 degrees; β1=0 0degree; degrees; 31= degree; β2= 32= 35 35 degrees; degrees; 33= β3= 30 degrees. 30 degrees.

[0296]

[0296] It has been It has been confirmed confirmedwith with these these settings, settings, the the devices of devices of this this embodiment embodiment works works satisfactorily. satisfactorily. However, However, these settingsdodonot these settings notlimit limitthethe present present invention. invention.

25 25 [Embodiment 2]

[Embodiment 2]

[0297]

[0297] Referring to Referring toFigure Figure3636 - Figure - Figure 38,38, the the second second embodimentto embodiment towhich whichapplied applied thethe present present invention invention will will be be described. described.

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[0298]

[0298] In this embodiment, In this embodiment,a ameans means forfor inclining inclining the the axis of the axis of thecoupling couplingrelative relativeto to thethe axisaxis of developing of the the developing roller. roller.

[0299]

[0299] In the description In the descriptionofofthis this embodiment, embodiment, the the samesame 5 5 reference numeralsasasinin reference numerals Embodiment Embodiment 1 are 1 are assigned assigned to the to the 2024200580

elements havingthe elements having thecorresponding corresponding functions functions in this in this embodiment, andthe embodiment, and thedetailed detailed description description thereof thereof is omitted is omitted for for simplicity. This applies simplicity. This applies also also about about the the other other embodiment embodiment described inthe described in thebelow. below.

10 10 [0300]

[0300] Figure 36 is Figure 36 isa aperspective perspective view view which which illustrates illustrates aacoupling couplinglocking locking member member (this (this is peculiar is peculiar to the to the present embodiment) present embodiment) pasted pasted on on the the supporting supporting member. member. Figure Figure 37 is an 37 is an enlarged enlargedperspective perspective view view of aofmajor a major part part of the of the driving driving side side of of the the cartridge. Figure38 cartridge. Figure 38is isaaperspective perspective 15 15 view and view and aa longitudinal longitudinal sectional sectional view view which which illustrate illustrate an an engaged statebetween engaged state betweenthe the drive drive shaft shaft and and the the coupling. coupling.

[0301]

[0301] As shown As shown in inFigure Figure36, 36, the the supporting supporting member member 3157 3157 has has aa space space 3157b 3157b which which surrounds surrounds aa part part of of coupling. coupling. AA coupling lockingmember coupling locking member 3159 3159 as as a maintaining a maintaining member member for for 20 20 maintaining the maintaining the inclination inclination ofof the the coupling coupling 3150 3150 is is pasted pasted on on a cylinder surface a cylinder surface3157i 3157i which which constitutes constitutes the the spacespace thereof. thereof. As will As will be bedescribed describedhereinafter, hereinafter, this this locking locking member member 3159 3159 is is a member for a member formaintaining maintaining temporarily temporarily the the state state wherewhere the axis the axis L2 L2 inclines inclines relative relative to to the the axis axis L1. L1. InInother otherwords, words,asasshown shown 25 25 in Figure 36, in Figure 36,the theflange flange portion portion 3150j 3150j of the of the coupling coupling 3150 3150 contacts contacts to to this this locking locking member member 3159. By this, 3159. By this, the theaxis axisL2 L2 maintains the maintains the state state of of inclining inclining toward toward the the downstream with downstream with respect to the respect to therotational rotational direction direction (X4)(X4) of of the the cartridge cartridge relative relative to to the the axis axis L1. Therefore, as L1. Therefore, as shown shown in in Figure Figure 46, 46, 30 30 the lockingmember the locking member3159 3159 is is disposed disposed on the on the upstream upstream cylinder cylinder surface 3157iofofthe surface 3157i thebearing bearing member member 31573157 withwith respect respect to the to the

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rotational rotational direction direction X4. As the X4. As the material material of of the the locking locking member 3159, member 3159,the thematerial material which which hashas a relatively a relatively high high coefficient offriction, coefficient of friction, such such as as thethe rubber rubber and and the elastomer, the elastomer, or the elastic or the elasticmaterials, materials, such such as as the the sponge sponge and flat and the the flat 5 5 spring, spring, are are suitable. This is suitable. This is because, because, the the inclination inclination of of the the axis L2 can axis L2 canbe bemaintained maintained by by thethe frictional frictional force, force, the elastic the elastic 2024200580

force, and SO force, and soon. on.

[0302]

[0302] Referring to Referring toFigure Figure38, 38, thethe engaging engaging operation operation (a (a part of mounting part of mountingand anddismounting dismounting operation operation of the of the 10 10 cartridge) forengaging cartridge) for engaging thethe coupling coupling 31503150 withwith the drive the drive shaft shaft 180 180 will will be be described. Figures 38 described. Figures 38 (a1) (a1) and and (b1) (b1) illustrate illustrate the the state immediately state immediatelybefore before thethe engagement, engagement, and Figure and Figure 38 38 (a2) and (b2) (a2) and (b2) illustrate illustratethe the state state of of thethe completion completion of the of the engagement. engagement.

15 15 [0303]

[0303] As shown As shown in inFigure Figure3838 (a1) (al) andand Figure Figure 38 (b1), 38 (b1), ,

the axis L2 the axis L2 of ofthe thecoupling coupling 3150 3150 inclines inclines toward toward the the downstream (retractedposition) downstream (retracted position) with with respect respect to rotational to the the rotational direction X4 direction X4relative relativetoto thethe axis axis L1 beforehand L1 beforehand by force by the the force of the locking of the lockingmember member3159 3159 (pre-engagement (pre-engagement angular angular position). position). 20 20 By this By this inclination inclinationofof the the coupling coupling 3150, 3150, by, by, in direction in the the direction of the axis of the axisL1, L1,the thedownstream downstream (with (with respect respect to to the the mounting mounting direction) freeend direction) free endportion portion 3150A1 3150A1 is closer is closer to to the the cartridge cartridge (developing roller)side (developing roller) sidethan than thethe drive drive shaft shaft freefree end 180b3. end 180b3. And, the And, the upstream upstream(with (with respect respect to to the the mounting mounting direction) direction) 25 25 free end portion free end portion3150A2 3150A2isis closer closer to to the the pin pin 182 182 than than the free the free end end 180b3 180b3 of of the the drive drive shaft shaft 180. Inaddition, 180. In addition,at atthis thistime, time, as has been as has beendescribed describedininthethe foregoing, foregoing, the the flange flange portion portion 3150j of the 3150j of thecoupling coupling150 150 is is contacted contacted to the to the locking locking member member 3159. And, the 3159. And, the inclined inclined state state of of the the axis axis L2 L2 is is maintained maintained byby 30 30 the frictionalforce the frictional forcethereof. thereof.

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[0304]

[0304] Thereafter, thecartridge Thereafter, the cartridge B moves B moves to the to the rotational rotational direction direction X4. X4. ByBythis, this,the thefree freeend endsurface surface180b 180b or the free or the freeend endofofthe the pin pin 182182 contacts contacts to the to the driving driving shaftshaft receiving receiving surface surface 3150f 3150f of of the the coupling coupling 3150. And, the 3150. And, the axis axis 5 5 L2 approachestotothe L2 approaches thedirection direction in in parallel parallel withwith the axis the axis L1 by L1 by the the contact contact force force (force (force revolving revolving the the rotary) rotary) thereof. At thereof. At 2024200580

this time, the this time, theflange flangeportion portion 3150j 3150j is departed is departed from from the the locking member3159, locking member 3159,and and becomes becomes into into the the non-contact non-contact state. state.

[0305]

[0305] And, finally, And, finally,the theaxis axis L1 L1 andand thethe axis axis L2 are L2 are 10 10 substantially co-axial substantially co-axial with with each each other. other.

[0306]

[0306] And, the And, the coupling coupling3150 3150 is is in in thethe waiting waiting (stand- (stand- by) state by) state for fortransmitting transmittingthethe rotational rotational force force (Figure (Figure 38 38 (a2), (a2), (b2)) (b2) ) (rotational forcetransmitting (rotational force transmitting angular angular position). position) .

[0307]

[0307] Similarly toembodiment Similarly to embodiment1, 1, thethe rotary rotary C swings C swings 15 15 about about aa swing swingcenter centeraxis axis andand contacts contacts the the developing developing roller roller 110 110 to to the the photosensitive photosensitive drum drum 107. And, the 107. And, the rotational rotational force force of the motor of the motor6464isistransmitted transmitted to to the the coupling coupling 3150,3150, the pin the pin 155, the development 155, the developmentshaft shaft 153, 153, andand the the developing developing rollerroller 110 110 through through the the drive drive shaft shaft 180. Theaxis 180. The axisL2 L2is issubstantially substantiallyCO co- 20 20 axial axial with with the the axis axis L1 L1 during during the the rotation. Forthis rotation. For thisreason, reason, the lockingmember the locking member3159 3159 is is notnot contacted contacted withwith the coupling the coupling 3150 and does 3150 and doesnot notinfluence influenceon on thethe drive drive of the of the coupling coupling 3150. 3150.

[0308]

[0308] After the After the image imageformation formation finishes, finishes, the the rotary rotary C C swings in the swings in theopposite opposite direction direction andand the the developing developing roller roller 110 110 25 25 spaces spaces from from the the photosensitive photosensitive drum drum 107. And then, 107. And then, in in order order to carry out to carry outthe theimage image formation formation forfor the the nextnext color, color, the the rotary rotary C C begins begins the the revolution. In that revolution. In that case, case, the the coupling coupling 3150 3150 disengages disengages from from the the drive drive shaft shaft 180. 180. InIn other other words, words, the the coupling 3150isismoved coupling 3150 movedtoto thethe disengaging disengaging angular angular position position 30 30 from the rotational from the rotationalforce force transmitting transmitting angular angular position. position.

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Since the operation Since the operationinin that that case case is is the the samesame as that as that of of Embodiment1 1(Figure Embodiment (Figure25), 25),thethe description description is omitted is omitted for for simplicity. simplicity.

[0309]

[0309] In addition,bybythe In addition, thetime time thethe rotary rotary C carries C carries 5 5 out one full out one fullrevolution, revolution,thethe axis axis L2 the L2 of of the coupling coupling 3150 3150 2024200580

inclines towardthe inclines toward thedownstream downstreamin in thethe rotational rotational direction direction X4 X4 by unshown by unshown means. means. InInother otherwords, words,the thecoupling coupling3150 3150isismoved moved from the disengaging from the disengagingangular angular position position to the to the pre-engagement pre-engagement angular position angular positionbybyway way of of thethe rotational rotational force force transmitting transmitting 10 10 angular angular position. position. ByBydoing doingso, so,the theflange flangeportion portion3150j 3150j contacts tothe contacts to thelocking locking member member 3159, 3159, and and the the inclined inclined statestate of of the couplingisismaintained the coupling maintained again. again.

[0310]

[0310] As has As has been been described described hereinbefore, hereinbefore, the the inclined inclined state of the state of theaxis axisL2L2isis maintained maintained by the by the locking locking member member 3159 3159 15 15 pasted on pasted on the the supporting supporting member member 3157. 3157. ByBythis, this,the theengagement engagement between the between thecoupling couplingand and thethe drive drive shaft shaft is established is established much much more assuredly. more assuredly.

[0311]

[0311] In the present In the presentembodiment, embodiment, thethe locking locking member member 3159 is pasted 3159 is pastedatatthe theupstreammost upstreammost side side of the of the innerinner surface surface 20 20 3157i of the 3157i of thesupporting supporting member member with with respect respect to rotational to the the rotational direction X4. direction X4. However, However,this thisisisnot notinevitable. inevitable.ForFor example, example, what is what is necessary necessaryisisthe the position position where where the the inclined inclined statestate thereof can be thereof can bemaintained maintained when when thethe axis axis L2 inclined. L2 is is inclined.

[0312]

[0312] The lockingmember The locking member3159 3159 hashas been been described described as as 25 25 contacting withthe contacting with theflange flange portion portion (Figure (Figure 38b1)38b1) 3150j3150j (Figure (Figure 38b1). However,the 38b1) . However, thecontact contact position position may may be driven be the the driven portion 3150a portion 3150a(Figure (Figure 38b1). 38b1).

[0313]

[0313] In this embodiment, In this embodiment,although although it it hashas beenbeen described that described thatthe thelocking locking member member isseparate is a a separate member, member, this this

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is is not not inevitable. For example, inevitable. For example, it it may may be be molded molded integrally integrally with the with the supporting supporting member member 3157 3157 (2 (2 color color molding, molding, for for example), and example), andthe thesupporting supporting member member 31573157 may may be directly be directly contacted tothe contacted to thecoupling coupling 3150 3150 in in place place of the of the locking locking member member 5 5 3159. Or, the 3159. Or, the surface surface of of the the coupling coupling may may be be roughened roughened for for the increaseofofthe the increase thecoefficient coefficientof of friction. friction. 2024200580

[0314]

[0314] In addition,although In addition, althoughitit hashas been been described described thatthat the lockingmember the locking member3159 3159 is is pasted pasted on the on the development development supporting member3157, supporting member 3157, it it maymay be be anything anything ifisita is if it a member member 10 10 fixed on the fixed on thecartridge cartridgeB.B.

Embodiment3: Embodiment 3:

[0315]

[0315] Referring to Referring to Figure Figure 39-Figure 39-Figure 42, 42, a a third third embodiment of embodiment ofthe thepresent present invention invention willwill be described. be described.

[0316]

[0316] The description The description will will be be made made as as to to means meansfor for 15 incliningthe 15 inclining theaxis axisL2 L2relative relativeto tothe theaxis axisL1. L1.

[0317]

[0317] As shown As shown in inFigure Figure3939 (perspective (perspective view), view), a a coupling pressingmember coupling pressing member peculiar peculiar to the to the present present embodiment embodiment is is mounted to mounted to the the supporting supporting member. member. Figure Figure4040is isa aperspective perspective view illustrating view illustrating the the coupling coupling pressing pressing member. member. Figure Figure4141is is 20 20 an enlargedperspective an enlarged perspective view view of of thethe major major partpart of driving of the the driving side side of of the the cartridge. Figure 42 cartridge. Figure 42 is is aa perspective perspective view view illustrating theengaging illustrating the engaging operation operation and and a longitudinal a longitudinal sectional viewofofthe sectional view thecoupling. coupling.

[0318]

[0318] As shown As shown in inFigure Figure39, 39, spring spring supporting supporting 25 25 portions 4157e1, portions 4157e1,4157e2 4157e2 areare provided provided on the on the inner inner surface surface 4157i 4157i of of the the supporting supporting member member (mounting (mounting member) member) 4157. 4157. InIn addition, the addition, the coil coil parts parts 4159b, 4159b, 4159c 4159c of of torsion torsioncoil coilsprings springs (coupling urgingmembers) (coupling urging members)4159 4159 areare mounted mounted to the to the supporting supporting

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portions 4157e1, portions 4157e1, 4157e2. 4157e2. And, And,asasshown shownininFigure Figure40, 40,a a contact portion4159a contact portion 4159aofof thethe urging urging member member 41594159 contacts contacts to to the driven portion the driven portion4150a 4150a side side of of a flange a flange portion portion 4150j4150j of theof the coupling coupling 4150. Thespring 4150. The spring4159 4159isistwisted twistedtotoproduce produceanan 5 5 elastic force. elastic force. ByBythis, this,the theaxis axisL2 L2ofofthe thecoupling coupling4150 4150is is inclined relativetotothe inclined relative the axis axis L1 L1 (Figure (Figure 41, 41, pre-engagement pre-engagement 2024200580

angular position) angular position).The The contact contact position position ofof the the urging urging member member 4159 to the 4159 to the flange flangeportion portion 4150j 4150j is is set set downstream downstream of the of the center of the center of thedevelopment development shaft shaft 153153 withwith respect respect to the to the 10 10 rotational rotational direction direction X4. Forthis X4. For thisreason, reason,the theaxis axis(L2) (L2)is is inclined relativetotothe inclined relative the axis axis (L1) (L1) so that SO that the the driven driven portion portion 4150a side is 4150a side isdirected directedtoto thethe downstream downstream withwith respect respect to the to the rotational direction(X4) rotational direction (X4). .

[0319]

[0319] In the present In the presentembodiment, embodiment, although although the the torsion torsion 15 15 coil springis coil spring isused usedasas the the urging urging member member (elastic (elastic material), material), this this is is not not inevitable. inevitable. TheThe any any means means which which can can produce producethe the elastic forces,such elastic forces, suchasas forfor example, example, leafleaf springs, springs, rubber, rubber, and and sponge, sponge, is is usable. However, in usable. However, in order order to to incline incline the the axis axis L2, L2, a a certain certain amount amount of of stroke stroke is is required. Therefore,aamember required. Therefore, member 20 20 which can which can provide providethe the stroke stroke is is desirable. desirable.

[0320]

[0320] In addition,the In addition, thespring spring supporting supporting portions portions 4157e1, 4157e2ofofthe 4157e1, 4157e2 thesupporting supporting member member 41574157 and coil and the the coil parts 4159b, parts 4159b,4159c 4159cfunction function as as thethe retention retention rib the rib for for the coupling describedwith coupling described with respect respect to to Embodiment Embodiment 1 (Figure 1 (Figure 9, 9, 25 25 Figure 12) Figure 12).

[0321]

[0321] Referring to Referring toFigure Figure42, 42, thethe engaging engaging operation operation (a (a part of rotating part of rotatingoperation operationof of thethe rotary) rotary) between between the the coupling coupling 4150 4150 and and the the drive drive shaft shaft 180 180 will will be be described. (a1) described. (al) and (b1) in and (b1) inFigure Figure4242are are views views immediately immediately before before the the 30 30 engagement, and(a2) engagement, and (a2)and and (b2) (b2) in in Figure Figure 42 illustrate 42 illustrate the the state state where where the the engagement engagement has has completed. (a3)and completed. (a3) and(b3) (b3)in in

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Figure 42 Figure 42 are areviews viewsinin the the state state where where the the engagement engagement has been has been released, and(a4) released, and (a4)and and (b4) (b4) in in Figure Figure 42 are 42 are views views in the in the state wherethe state where theaxis axisL2L2 inclines inclines toward toward the the downstream downstream with with respect to the respect to therotational rotational direction direction X4 again. X4 again.

5 5 [0322]

[0322] In the state In the state(retreating (retreating position position of the of the 2024200580

coupling 4150)ofofFigs. coupling 4150) Figs.42 42 (a1) (al) andand 42 (b1), 42 (b1), the axis the axis L2 L2 thereof is beforehand thereof is beforehandinclined inclined toward toward the the downstream downstream with with respect to the respect to therotational rotational direction direction X4 relative X4 relative to axis to the the axis L1 L1 (pre-engagement angularposition) (pre-engagement angular position). Thus, . Thus, the the coupling coupling 4150 4150 is is 10 10 inclined. inclined. ByBythis, this,ininthe thedirection directionof ofthe theaxis axisL1, L1,the the downstream freeend downstream free endposition position 4150A1 4150A1 withwith respect respect to the to the rotational directionX4X4 rotational direction is is positioned positioned in the in the cartridge cartridge (developing roller)side (developing roller) sidebeyond beyond thethe drive drive shaft shaft free-end free-end 180b3. Inaddition, 180b3. In addition,the theupstream upstreamfree freeend endposition position4150A2 4150A2 15 15 with respect with respect to to the the rotational rotational direction direction X4 X4 is is positioned positioned beyond the beyond thepin pin182 182side side from from thethe drive drive shaft shaft free-end free-end 180b3. 180b3. In other words, In other words,asashas has been been described described hereinbefore, hereinbefore, the flange the flange portion 4150j portion 4150j is is pressed pressed byby the the urging urging member member 4159. 4159. For Forthis this reason, the axis reason, the axisL2L2isisinclined inclined relative relative to the to the axis axis L1 byL1 by the the 20 20 urging force. urging force.

[0323]

[0323] Thereafter, thecartridge Thereafter, the cartridge B moves B moves in the in the rotational rotational direction direction X4. X4. ByBy this, this, the the free free end end surface surface 180b 180b or the free or the freeend endofofthe the pin pin 182182 contacts contacts to the to the driving driving shaftshaft receiving receiving surface surface 4150f 4150f ofof the the coupling coupling 4150. And, the 4150. And, the axis axis 25 25 L2 approaches L2 approachestotothe theangle anglein in parallel parallel withwith the axis the axis L1 byL1 theby the contact force(force contact force (forceofof rotating rotating thethe rotary). rotary) .

[0324]

[0324] Simultaneously, theflange Simultaneously, the flange portion portion 4150j 4150j and and the the urging urging spring spring 4159 4159 contact contact with with each each other. Bythis, other. By this,the the spring spring 4159 4159 is is twisted twisted to to increase increase the the moment. Finally, moment. Finally, the the 30 30 axis L1 and axis L1 andthe theaxis axisL2L2 become become substantially substantially co-axial co-axial with with each other,and each other, andthe thecoupling coupling 4150 4150 is the is in in the rotation rotation latency latency

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state (Figure4242(a2) state (Figure (a2), (b2)). , (b2) (rotational ) (rotational force force transmitting transmitting angular position). angular position) .

[0325]

[0325] Similarly toembodiment Similarly to embodiment1, 1, thethe rotational rotational force force is transmittedtotothe is transmitted thecoupling coupling 4150, 4150, the the pin pin 155,155, the the 5 5 developmentshaft development shaft153, 153, and and thethe developing developing roller roller 110 through 110 through 2024200580

the the drive drive shaft shaft 180 180 from from the the motor motor 64. Theurging 64. The urgingforce forceof of the the urging member urging member4159 4159 applies applies to to thethe coupling coupling 4150 4150 at the at the time time of of the the rotation. However,if rotation. However, ifthe thedriving drivingtorque torqueofofthe the motor 64 motor 64 has hasa asufficient sufficient margin, margin, the the coupling coupling 4150 4150 will will 10 10 rotate with high rotate with highprecision. precision.

[0326]

[0326] When the When the rotary rotaryfurther further revolves, revolves, the the coupling coupling 4150 4150 will will separate separate from from the the drive drive shaft shaft 180 180 asas shown shown in in Figure Figure 42 42 (a3) (a3) and and (b3). (b3) InIn other other words, words, the the free free end end spherical surface180b spherical surface 180b ofof thethe drive drive shaft shaft 180 180 pushes pushes the the 15 15 driving driving shaft shaft receiving receiving surface surface 4150f 4150f of of the the coupling. coupling. ByBy this, the axis this, the axisL2L2inclines inclines toward toward thethe opposite opposite direction direction (opposite directionfrom (opposite direction fromthe the rotational rotational direction direction X4) with X4) with respect respect to to the the axis axis L1 L1 (disengaging (disengaging angular angular position). position) ByBy doing so, the doing so, theurging urgingmember member 4159 4159 is is further further twisted twisted so that SO that 20 20 the the urging urging force force (elastic (elastic force) force) further further increases. Forthis increases. For this reason, afterthe reason, after thecoupling coupling 4150 4150 disengages disengages fromfrom the drive the drive shaft 180, the shaft 180, theaxis axisL2L2 isis again again inclined inclined in the in the rotational rotational direction X4 direction X4relative relativetoto thethe axis axis L1 the L1 by by the urging urging forceforce of of the urging member the urging member4159 4159 (pre-engagement (pre-engagement angular angular position, position, 25 25 Figure42 (a4), Figure42 (a4) (b4)). , (b4) By this, ) . By this, even evenififthe themeans meansforfor inclining theaxis inclining the axisL2L2toward toward thethe pre-engagement pre-engagement angular angular position by position bythe thetime timethe the drive drive shaft shaft 180 180 and and the coupling the coupling 4150 4150 are again coupled are again coupledbybythe the revolution revolution of the of the rotary rotary C withC with each each other is not other is notprovided providedparticularly, particularly, the the drive drive shaftshaft 180 and 180 and 30 30 the coupling4150 the coupling 4150are areconnectable connectable (engageable) (engageable) with with each each other. other.

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[0327]

[0327] As has As has been been described described hereinbefore, hereinbefore, the the urging urging is effected by is effected bythe theurging urging member member 4159 4159 provided provided on the on the supporting supporting member member 4157. By this, 4157. By this, the the axis axis L2 L2 is is inclined inclined relative relative to to the the axis axis L1. Therefore, the L1. Therefore, the inclined inclined state state of of the the 5 5 coupling 4150isismaintained coupling 4150 maintained assuredly assuredly and and the the engagement engagement (coupling) betweenthe (coupling) between thecoupling coupling 4150 4150 andand the the drive drive shaftshaft 180 180 2024200580

is ensured. is ensured.

[0328]

[0328] The position The positionofofthe theurging urging member member in the in the present present embodiment embodiment is is not not restrictive. Forexample, restrictive. For example,ititmay maybebeanother another 10 10 position on position onthe thesupporting supporting member member 4157, 4157, or may or may be a be a member member other than other than such sucha amember. member.

[0329]

[0329] In addition,the In addition, theurging urging direction direction of the of the urging urging member 4159 member 4159isisthe thesame same as as thethe direction direction of axis of the the axis L1, but L1, but if the axis if the axis L2 L2inclines inclinesin in thethe predetermined predetermined direction, direction, it may it may 15 15 be any be any direction. direction.

[0330]

[0330] In addition,the In addition, theenergizing energizing position position of the of the urging member urging member4159 4159isis the the position position of the of the flange flange portion portion 4150j, but if 4150j, but ifthe theaxis axis L2L2 inclines inclines toward toward the the predetermined predetermined direction, itmay direction, it maybebeany any position position of the of the coupling. coupling.

20 20 Embodiment Embodiment 4 :4:

[0331]

[0331] Referring to Referring toFigure Figure43-Figure 43-Figure 46,46, , the , the fourth fourth embodiment ofthe embodiment of thepresent present invention invention willwill be described. be described.

[0332]

[0332] The means The means for forinclining incliningthethe axis axis L2 with L2 with respect respect to the axis to the axisL1 L1will willbebe described. described.

25 25 [0333]

[0333] Figure 43 is Figure 43 isananexploded exploded perspective perspective viewview illustrating thestate illustrating the state before before thethe assembly assembly of major of the the major members of members of the the developing developing cartridge. cartridge. Figure Figure44 44is isan anenlarged enlarged

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side side view view of of the the driving driving side side of of the the cartridge. Figure45 cartridge. Figure 45is is a longitudinalsectional a longitudinal sectional view view which which schematically schematically illustrates illustrates the the structure structure for for the the axis axis L2 L2 to to incline. Figure 46 incline. Figure 46 is is the the drive shaftand drive shaft anda alongitudinal longitudinal sectional sectional viewview illustrating illustrating the the 5 5 engaging operationbetween engaging operation between thethe coupling. coupling. 2024200580

[0334]

[0334] As shown As shown inin Figure Figure 43 and 43 and Figure Figure 45, 45, aa coupling coupling locking member5157k locking member 5157kisis provided provided on on the the supporting supporting member member (mounting (mounting member) member) 5157. When the 5157. When the supporting supporting member member 5157 5157 is is assembled inthe assembled in thedirection directionof of thethe axisaxis L1, L1, while while a part a part of a of a 10 10 locking surface5157k1 locking surface 5157k1ofof an an of of thethe locking locking member member 5157k5157k contacts withthe contacts with theinclined inclined surface surface 5150m 5150m of the of the coupling coupling 5150, 5150, the part engages the part engageswith withthe the upper upper surface surface 5150j1 5150j1 of a of a flange flange portion 5150j. portion 5150j. At Atthis thistime, time,the theflange flangeportion portion5150j 5150jis is mounted with mounted withplay play(angle (angle alpha alpha 49)49) between between locking locking surface surface 15 15 5157k1 5157k1 and and circular circular column column portion ofthe portion of thedevelopment developmentshaft shaft 153 153a. Even 153 153a. Even when when the the dimensional dimensional tolerances tolerances ofof the the coupling 5150,the coupling 5150, thebearing bearing member member 5157, 5157, and and the the development development shaft 153 vary, shaft 153 vary,the theflange flange portion portion 5150j1 5150j1 can can lock lock assuredly assuredly to the locking to the lockingportion portion 5157k1 5157k1 of of thethe bearing bearing member member 5157 5157 by by 20 20 providing this providing thisplay play(angle (angle alpha alpha 49). 49).

[0335]

[0335] And, as And, as shown shownininFigure Figure 45 45 (a)(a), the , the axis axis L2 L2 is is inclined so that inclined SO thatthe thedriven driven portion portion 5150a 5150a sideside facesfaces the the downstream with downstream withrespect respectto to thethe rotational rotational direction direction X4 X4 relative relative to to the the axis axis L1. L1. InIn addition, addition, since since the the flange flange 25 25 portion 5150j portion 5150jextends extends over over thethe full-circumference, full-circumference, it be it can can be mounted regardless mounted regardlessofof the the phase phase of the of the coupling coupling 5150.5150. Furthermore, ashas Furthermore, as hasbeen been described described with with respect respect to Embodiment to Embodiment 1, the coupling 1, the couplingisispivotable pivotable in in thethe rotational rotational direction direction X4 by X4 by the the regulating regulating portion portion 5157h 5157h 1 1 or or 5157h2. 5157h2. InInaddition, addition,inin 30 30 this embodiment, this embodiment, the the locking locking member member 5157k 5157k is is provided provided at at the the downstreammost position downstreammost position in in thethe rotational rotational direction direction X4. X4.

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[0336]

[0336] As will As will be bedescribed describedhereinafter, hereinafter, as shown as shown in in Figure Figure 45 45 (b), (b) ininthe thestate stateofofbeing beingin inengagement engagementwith withthe the drive shaft180, drive shaft 180,the theflange flange portion portion 5150j 5150j is released is released from from the the locking locking member member 5157k. In addition, 5157k. In addition, the the coupling coupling 5150 5150 is is free free 5 5 from from the the locking locking portion portion 5157k. In assembling 5157k. In assembling the the supporting supporting member 5157, member 5157, when when the the coupling coupling 5150 5150 is is not not able able to to be be retained retained 2024200580

in the inclined in the inclinedstate, state, the the driving driving portion portion 5150b 5150b of the of the coupling ispushed coupling is pushedbybytool tool andand SO so on (the on (the direction direction of anof an arrow X14 of arrow X14 ofFigure Figure4545 (b)). (b) ) . ByBy this, this, thethe coupling coupling 51505150 will will 10 10 mount easily mount easily(Figure (Figure4545 (a)(a)). ) .

[0337]

[0337] Referring to Referring toFigure Figure46, 46, , the , the engaging engaging operation operation (a (a part of rotary part of rotaryrotating rotating operation) operation) between between the the coupling coupling 5150 5150 and and the the drive drive shaft shaft 180 180 will will be be described. Figure 46 described. Figure 46 (a) (a) shows shows aa view viewimmediately immediately before before thethe engagement, engagement, and is and (b) (b) a is a 15 15 view after view after aapart partofofcoupling coupling 5150 5150 passes passes the the drivedrive shaftshaft 180. 180. In addition,(c) In addition, (c)illustrates illustratesthethe state state where where the inclination the inclination of the coupling of the coupling5150 5150isis released released by by the the drive drive shaft shaft 180, 180, and and (d) (d) illustrates theengaged illustrates the engaged state. state.

[0338]

[0338] In the state In the stateof ofFigure Figure4646 (a)(a) andand (b),(b), the the 20 20 coupling 5150takes coupling 5150 takesa aretreating retreating position, position, wherewhere the axis the axis L2 L2 thereof is inclined thereof is inclinedbeforehand beforehand to to thethe rotational rotational direction direction X4 X4 relative to the relative to theaxis axisL1L1 (pre-engagement (pre-engagement angular angular position). position) . The downstream The downstreamfree freeend end position position 5150A1 5150A1 withwith respect respect to the to the rotational directionX4X4 rotational direction takes takes a position a position closer closer to the to the 25 25 cartridge cartridge BB (developing (developing roller) roller) than than the thedrive drive shaft shaft free-end free-end 180b3 180b3 by by the the inclination inclination of of the the coupling coupling5150. In addition, 5150. In addition, the upstreamfree the upstream freeend endposition position 5150A2 5150A2 withwith respect respect to the to the rotational directionX4X4 rotational direction is is positioned positioned in the in the pin side pin 182 182 side from from the the drive drive shaft shaft free-end free-end 180b3. 180b3. AtAtthis thistime, time,as ashas hasbeen been 30 30 described hereinbefore, described hereinbefore,thethe flange flange portion portion 5150j 5150j is contacted is contacted to the locking to the lockingsurface surface 5157k1 5157k1 of of thethe locking locking portion portion 5157k, 5157k, and, as for and, as forthe thecoupling, coupling, thethe inclined inclined state state is maintained. is maintained.

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[0339]

[0339] Thereafter, asshown Thereafter, as showninin (c), (c) thecartridge , the cartridge B B moves in moves in the the rotational rotational direction direction X4. X4. ByBythis, this,tapered tapered driving shaftreceiving driving shaft receiving surface surface 5150f 5150f of the of the coupling coupling 5150 5150 or or driven projection driven projection5150d 5150d contacts contacts to the to the freefree end portion end portion 180b 180b 5 5 of of the the drive drive shaft shaft 180, 180, or or the the pin pin 182. Theflange 182. The flangeportion portion 5150j separatesfrom 5150j separates fromthe the locking locking surface surface 5157k1 5157k1 by force by the the force 2024200580

by the by the contact. By contact. Bythis, this,the thelock lockrelative relativeto tothe thesupporting supporting member member 5157 of 5157 of the the coupling coupling 5150 5150 is is released. released. And, And,in in response to the response to therotation rotationof of thethe rotary rotary C, the C, the coupling coupling is is 10 10 inclined so that inclined SO thatthe theaxis axis L2 L2 becomes becomes parallel parallel to axis to the the axis L1. L1. After the After the passage passageofof the the flange flange portion portion 5150j, 5150j, the locking the locking member 5157k member 5157k returns returns toto the the previous previous position position byby the the restoring restoring force. Then, the force. Then, the coupling coupling 5150 5150 becomes becomes free free from from the the locking locking portion 5157k. portion 5157k. And, And,finally, finally,asasshown shownin in(d), (d),the theaxis axisL1L1and and 15 15 theaxis the axisL2L2become becomesubstantially substantiallyco-axial, co-axial,and andthe therotation rotation latency stateisisestablished latency state established (rotational (rotational force force transmitting transmitting angular angular position). position)

[0340]

[0340] And, after And, afterthe theimage imageforming forming operation operation finishes, finishes, the the next next cartridge cartridge BB reaches reaches the the developing developing position. For position. For 20 thispurpose, 20 this purpose,the therotary rotaryC Crotates rotatesagain. again.In In that that case, case, the the coupling coupling 5150 5150 disengages disengages from from the the drive drive shaft shaft 180. Inother 180. In other words, the words, thecoupling coupling5150 5150 is is moved moved to the to the disengaging disengaging angular angular position from position fromthe therotational rotational force force transmitting transmitting angular angular position. Since position. Sincethe thedetail detailofofthe theoperation operationininthat thatcase caseis is 25 25 the same as the same asEmbodiment Embodiment 1 (Figure 1 (Figure 25)25), the description , , the descriptionisis omitted forsimplicity. omitted for simplicity.

[0341]

[0341] In addition,bybythe In addition, thetime time thethe rotary rotary C carries C carries out one-fullrevolution, out one-full revolution,thethe axis axis L2 the L2 of of the coupling coupling 5150 5150 inclines tothe inclines to thedownstream downstream with with respect respect to the to the rotational rotational 30 30 directionX4 direction X4by byananunshown unshownmeans. means.In In other other words, words, thethe coupling 5150isismoved coupling 5150 moved from from thethe disengaging disengaging angular angular position position to the pre-engagement to the pre-engagementangular angular position position by way by way of the of the

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rotational rotational force force transmitting transmitting angular angular position. By doing position. By doing so, so, the flange portion the flange portion5150j 5150j contacts contacts to the to the locking locking member member 3157k, 3157k, and the inclined and the inclinedstate state of of thethe coupling coupling is maintained is maintained again. again.

[0342]

[0342] As has As has been beendescribed described hereinbefore, hereinbefore, the the 5 5 inclining directionofofthe inclining direction the coupling coupling 5150 5150 is regulated is regulated by the by the 2024200580

locking locking portion portion 5157k 5157k ofof the the supporting supporting member member 5157. 5157. ByBy this, this, the inclinedstate the inclined stateofofthe the coupling coupling 5150 5150 is maintained is maintained even even more assuredly. more assuredly. And, And,the theengagement engagementbetween betweenthethecoupling coupling5150 5150 and the drive and the driveshaft shaft180 180 is is established established assuredly. assuredly. 10 10 Furthermore,at Furthermore, atthe thetime timeofofthe therotation, rotation,the thestructure structurethat that the lockingportion the locking portion5157k 5157k does does notnot contact contact to coupling to the the coupling 5150 also contributes 5150 also contributestoto thethe stabilized stabilized transmission transmission of the of the rotational force. rotational force.

[0343]

[0343] In this embodiment, In this embodiment,thethe locking locking portion portion 5157k 5157k 15 15 has an has an elastic elastic portion. portion. However, However,thethelocking lockingportion portion5157k 5157k may not may not have havethe theelastic elastic portion portion and and it may it may be formed be formed in the in the shape of aa rib shape of ribbybywhich which the the flange flange portion portion of coupling of the the coupling is is made to made to deform. deform. By Bythis, this,the thesimilar similareffects effectsare areprovided. provided.

[0344]

[0344] In addition,the In addition, thelocking locking portion portion 5157k 5157k is is providedatatthe 20 provided 20 thedownstreammost downstreammostside sidewith withrespect respecttotothe the rotational rotational direction direction X4. However, the X4. However, the locking locking portion portion 5157k 5157k may be may be any anyposition positionifif thethe axis axis L2 can L2 can maintain maintain the state the state of of inclining tothe inclining to thepredetermined predetermined direction. direction.

[0345]

[0345] In this embodiment, In this embodiment,thethe locking locking portion portion 5157k 5157k is is 25 25 constituted constituted by by aa part part of of supporting supporting members. However,the members. However, the locking portion5157k locking portion 5157kmay may be be provided provided in another in another position position of of the supportingmember, the supporting member,or or it it maymay be be a member a member other other than than the the supporting supporting member. In addition, member. In addition, the the locking locking portion portion may may be be aa separate member. separate member.

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[0346]

[0346] In addition,the In addition, thepresent present embodiment, embodiment, and and Embodiment 2 Embodiment 2 or or Embodiment Embodiment 33 may may be be implemented implemented simultaneously, andthe simultaneously, and the engagement engagement and and the the disengaging disengaging operations ofthe operations of thecoupling coupling relative relative to the to the drive drive shaftshaft are are 5 5 carried out even carried out evenmore moreassuredly assuredly in in this this case. case. 2024200580

Embodiment 5: Embodiment 5:

[0347]

[0347] Referring to Referring to Figure Figure 47-Figure 47-Figure 51, 51,,the thefifth fifth embodiment ofthe embodiment of thepresent present invention invention willwill be described. be described.

[0348]

[0348] The means for The means forinclining inclining thethe axis axis L2 L2 relative relative to to 10 10 the axis L1 the axis L1will willbebedescribed. described.

[0349]

[0349] Figure 47 shows Figure 47 showsa aview view of of supporting supporting member member and and rotary flangeofofthe rotary flange thedriving driving side, side, as seen as seen in direction in the the direction of of the the axis axis L1. Figure48 L1. Figure 48shows showsaaview viewofofthe themembers membersofofthe the apparatus mainassembly, apparatus main assembly,as as seen seen in in the the direction direction of axis of the the axis 15 15 L1. Figure L1. Figure49 49isisthe thesame sameas asFigure Figure48, 48,however howeverthe thelocus locusofof the the coupling coupling isis added. Figure50 added. Figure 50is isaasectional sectionalview viewtaken taken along linesS10-S10, along lines S10-S10,S11-S11, S11-S11, S12-S12, S12-S12, S13-S13, S13-S13, S14-S14 S14-S14 in in Figure 49. Figure 49.

[0350]

[0350] First, referringtotoFigure First, referring Figure 47,47, thethe structure structure for for 20 20 regulating theinclining regulating the inclining direction direction of the of the coupling coupling 150 will 150 will be be described. The described. Thesupporting supportingmember member7157 7157rotates rotatesintegrally integrallywith with the the rotary rotary C. Themember C. The member7157 7157isisprovided providedwith withregulating regulating portions 7157h portions 7157h1 1oror7157h2 7157h2 forfor permitting permitting the the inclination, inclination, only only in in said said one one direction, direction, of of the the coupling coupling 7150. 7150. AAdistance distance 25 25 D6 between these D6 between theseregulating regulating portions portions is slightly is slightly larger larger than than the outer diameter the outer diameter(unshown) (unshown)of of thethe driving driving portion portion 7150b7150b of of the coupling7150 the coupling 7150totopermit permit thethe rotation rotation of the of the coupling coupling 7150. 7150. The regulating The regulatingportions portions 7157h1 7157h1 andand 7157h2 7157h2 are are inclined inclined by by angle angle of of alpha alpha 7 7 relative relative to to the the rotational rotational direction direction X4. By X4. By

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this, the coupling this, the coupling7150 7150 is is pivotable pivotable to the to the alpha7 alpha7 X5 X5 direction with direction withrespect respectto to thethe rotational rotational direction direction X4. X4.

[0351]

[0351] Referring to Referring to Figure Figure 48, 48,,the themethod methodfor for inclining inclining the the coupling coupling 7150 7150 will will be be described. described. In In the the present present 5 5 embodiment, embodiment, a aregulation regulationribrib 1630R 1630R fixed fixed to the to the driving driving side side 2024200580

180 180 is is provided. The radius provided. The radius of of the the surface surface inside inside the the radial radial direction of direction ofthe therib rib1630R 1630R is is gradually gradually reduced reduced toward toward the the downstream portion1630Rb downstream portion 1630Rb from from thethe upstream upstream partpart 1630Ra, 1630Ra, R-2 R-2 with respect with respect to to the the rotational rotational direction direction X4. X4. And, And,the theradius radius 10 10 R-1 of R-1 of this thissurface surfaceisis selected selected SO so thatthat it contacts it contacts and is and is interfered bythe interfered by theouter outer periphery periphery 7150c1 7150c1 of the of the intermediate intermediate part 7150c part 7150cof ofthe thecoupling coupling Figure Figure 45. 45.

[0352]

[0352] When the When the coupling coupling7150 7150 contacts contacts with with the the regulation rib1630R, regulation rib 1630R,the the coupling coupling 7150 7150 is pushed is pushed toward toward the the 15 rotationaxis 15 rotation axisof ofthe therotary rotaryC.C.At At this this time, time, thethe coupling coupling 7150 is regulated 7150 is regulatedbybythe the regulating regulating portions portions 1557h1557h 1 or 11557h2 or 1557h2 in in the the movement movement direction. direction. ForFor this this reason, reason, the the coupling coupling 7150 7150 is is inclined to inclined tothe theX5X5direction. direction.

[0353]

[0353] An increase An increaseofofthe thedegree degree of of thethe interference interference willalso 20 will 20 alsoincrease increasethetheinclination inclinationofofthe thecoupling coupling7150. 7150.TheThe configuration configuration ofofthe theregulation regulation ribrib 1630R 1630R is such is such that that before before the coupling7150 the coupling 7150engages engages with with thethe drive drive shaft shaft 180, 180, the amount the amount of interferencesisisincreased of interferences increased until until the the inclination inclination angleangle of of the the coupling coupling 7150 7150 becomes becomes the the engageable engageable angle. Inthe angle. In the 25 25 present embodiment, present embodiment,the the section section from from the the position position 1630Rb 1630Rb to to the position1630RC the position 1630Rcisis located located on on thethe samesame radius radius positions positions from from the the rotation rotation axis axis of of the the rotary rotary C. The radius C. The radius is is indicated byR-1. indicated by R-1.

[0354]

[0354] Figure 49 illustrates Figure 49 illustratesthe the locus locus until until the the 30 30 coupling 7150engages coupling 7150 engageswith with thethe drive drive shaft shaft 180 180 alongalong the guide the guide

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1630R 1630R with with the the rotation rotation of of the the rotary rotary C. C. AA section section taken taken along linesS10-S10-S14-S14 along lines S10-S10-S14-S14in in Figure Figure 49 49 shown is is shown in Figure in Figure 50(a)-(e). 50 (a) (e) .

[0355]

[0355] The coupling7150 The coupling 7150enters enters thethe region region of the of the 5 5 regulation regulation rib rib 1630R 1630R in in the the direction direction of of X4. X4. At At this this time, time, 2024200580

the couplingisisfaced the coupling facedinin thethe direction direction of which of X6 X6 which is the is the substantially advancing substantially advancing direction, direction, is faced is faced in reverse in the the reverse direction of direction ofX7, X7,ororisis faced faced in in thethe inbetween inbetween direction direction thereof. Here, the thereof. Here, the case case where where the the coupling coupling 7150 7150 faces faces the the 10 10 direction of direction ofX7X7will willbebe described. described.

[0356]

[0356] The incliningdirection The inclining directionX5 X5 (Figure (Figure 47) 47) of the of the coupling coupling 7150 7150 is angle alpha is angle alpha 77 relative relative to to the the rotational rotational direction X4. direction X4. InInview viewof ofthis, this,when whenthe thecoupling coupling7150 7150 inclines towardthe inclines toward theX7X7direction, direction,thethe driven driven portion portion 7150a7150a of of 15 15 the couplingoutwardly the coupling outwardly inclines inclines with with respect respect to radial to the the radial direction of direction of the the rotary rotary CC (Figure (Figure 47) 47).TheThe gapgap G1G1 isis provided provided between the between the coupling coupling 7150 7150 and and the the regulation regulation rib rib 1630R 1630R in in the the place where place whereititenters enters the the range range of of the the regulation regulation member member 1630R. 1630R.

20 20 [0357]

[0357] When the When the rotation rotationofofthe the rotary rotary C advances C advances to to the S11-S11section, the S11-S11 section,the the coupling coupling 7150 7150 and and the the regulation regulation rib rib 1630R contacttotoeach 1630R contact eachother other (Figure (Figure 50b)50b). . The The radius radius of the of the regulation regulation rib rib 1630R 1630R is is reduced reduced gradually. Therefore, aa gradually. Therefore, degree of degree of the theinterference interference increases increases withwith the the advancement advancement of of 25 25 thecoupling the coupling7150. 7150.

[0358]

[0358] In the position In the positionofofthe the section section S12-S12, S12-S12, the the regulation rib1630R regulation rib 1630Rpushes pushes up up thethe coupling coupling 7150, 7150, andisit is and it co-axial with co-axial withthe thedevelopment development shaft shaft (Figure (Figure 50c)50c). At this . At this time, the motion time, the motionofofthe the coupling coupling 7150 7150 is regulated is regulated by the by the 30 30 regulation regulation rib rib 1630R. 1630R. In In view view of of this, this, the the coupling coupling 7150 7150 is is

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pivotable only pivotable onlyininthe the X8 X8 direction direction (only (only indirection in X6 X6 direction in in the cross-sectionalposition the cross-sectional position of of S10-S10), S10-S10), and , and cannot cannot be be inclined towardthe inclined toward theopposite opposite direction direction X8 thereto. X8 thereto.

[0359]

[0359] In the cross-sectional In the cross-sectional S13-S13 S13-S13 position, position, the the 5 5 degree of the degree of theinterference interference of of thethe coupling coupling relative relative to the to the 2024200580

regulation regulation rib rib 1630R 1630R increases. increases. In Inview viewofofthis, this,the thecoupling coupling 7150 is pushed 7150 is pushedupupbybythe the ribrib 1630R, 1630R, and and is forcedly is forcedly inclined inclined in the direction in the directionofofX9X9 (X8 (X8 direction direction in the in the section section S12-S12) S12-S12) (Figure 50 (d) (Figure 50 (d)). ) . (pre-engagement angularposition) (pre-engagement angular position).

10 10 [0360]

[0360] In this state, In this state,the therotary rotary C is C is rotated rotated until until the the coupling becomesco-axial coupling becomes co-axial with with thethe drive drive shaft shaft 180 (S14-S14 180 (S14-S14 section position). section position) . ByBy this, this, thethe coupling coupling 71507150 canengaged can be be engaged with the with the drive driveshaft shaft180 180 through through the the operation operation similar similar to to Embodiment11(rotational Embodiment (rotational force force transmitting transmitting angular angular position). position)

15 [0361] 15 [0361] Thereafter, afterthe Thereafter, after theimage image formation formation finishes, finishes, the coupling7150 the coupling 7150isisdisengaged disengaged from from the the drive drive shaftshaft 180, 180, SO so that, it is that, it isaaseries seriesofof operations operations are are finished finished (since (since the the disengaging operationisis disengaging operation thethe same same as those as those of foregoing of the the foregoing embodiments,the embodiments, thedescription description is is omitted omitted for for simplicity). simplicity). . This This 20 20 operation isrepeated operation is repeatedfor for every every image image formation. formation.

[0362]

[0362] In order for In order forthe thecoupling coupling to to interfere interfere withwith the the regulation rib,the regulation rib, thecoupling coupling is is contacted contacted to from to it it from the the outside withrespect outside with respecttoto thethe radial radial direction, direction, and inclines and inclines the the coupling coupling thereby. However, it thereby. However, it is is regulated regulated such such that that the the anglealpha 25 angle 25 alpha7 7(in (inFigure Figure4747the theX5X5direction) direction)ofofthethe regulating portions1557h regulating portions 1557h 1 or 1 or 1557h2 1557h2 are are line-symmetrical line-symmetrical with respect with respect the the tangential tangential direction direction (the (the X4 X4 direction). direction). ByBy this, the same this, the sameoperation operation is is carried carried out out whenwhen the regulation the regulation rib 1630R is rib 1630R iscontacted contacted from from thethe radial radial inside. inside.

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[0363]

[0363] The cartridge The cartridgedoes doesnot not need need to to be be provided provided withwith the mechanismfor the mechanism forinclining inclining thethe coupling coupling by the by the orientation orientation of of the coupling7150 the coupling 7150being being regulated regulated by the by the regulation regulation rib 1630R. rib 1630R. By this, By this, the thecost costreduction reduction of of thethe cartridge cartridge can be can be accomplished. 5 accomplished. 5 2024200580

[0364]

[0364] In this embodiment, In this embodiment,thethe coupling coupling maymay be be assuredly slid assuredly slidalong alongthe theribrib by by applying applying the the forceforce to the to the coupling withthe coupling with thespring spring andand SO so on.on.

[0365]

[0365] In addition,ititisismoved In addition, moved on on thethe guide guide rib rib 10 10 throughan through anintermediate intermediatepart part7150c 7150cof ofthe thecoupling. coupling.However, However, if the inclination if the inclinationofofthe the coupling coupling is possible, is possible, it move it may may move on on the guide rib the guide ribthrough throughthe the position position other other thanthan the intermediate the intermediate part. part.

[0366]

[0366] In addition,the In addition, thepresent present embodiment, embodiment, Embodiment Embodiment 15 15 2 or 2 or Embodiment Embodiment3,3,oror Embodiment Embodiment 4 may 4 may be implemented be implemented simultaneously, simultaneously, and in such and in such aa case, case, Engagement Engagement and and disengagementoperations disengagement operationsof of thethe coupling coupling can can be ensured. be ensured.

Embodiment6:6: Embodiment

[0367]

[0367] Referring to Referring to Figure Figure 51-Figure 51-Figure 52, 52,,the thesixth sixth embodimentofofthe 20 embodiment 20 thepresent presentinvention inventionwill willbebedescribed. described.

[0368]

[0368] In this embodiment, In this embodiment,the the configuration configuration of another of another coupling isemployed. coupling is employed.

[0369]

[0369] Figure 51 Figure 51 is isananillustration illustrationof of thethe coupling coupling which is which is the themain mainconstituent-elements constituent-elements of the of the present present embodiment.Figure 25 embodiment. 25 Figure 52 52 is is a longitudinal a longitudinal sectional sectional view view illustrating engagedstate illustrating engaged stateandand state state before before the the engagement engagement

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between drive between driveshaft shaftofof thethe apparatus apparatus mainmain assembly assembly and the and the coupling. coupling.

[0370]

[0370] First, referringtotoFigure First, referring Figure 51,51,, the , the configuration configuration ofofthe thecoupling coupling perper se will se will be described. be described. 5 5 Figure 51 Figure 51 (a) (a)shows showsa a view view of of thethe coupling, coupling, as seen as seen from from the the 2024200580

apparatus mainassembly apparatus main assembly side, side, Figure Figure 51 (b) 51 (b) shows shows a view a view of of the coupling,asasseen the coupling, seenfrom fromthethe developing developing roller roller side,side, and and Figure 51 (c) Figure 51 (c)isisa asectional sectional view view taken taken along along S4-S4S4-S4 in Figure in Figure 51 51 (a). (a)

10 10 [0371]

[0371] The coupling The coupling 8150 8150 is is generally generally cylindrical. cylindrical. AsAs shown in Figure shown in Figure5151(c) (c) the the coupling coupling 81508150 has has a drive a drive shaftshaft insertion openingportion insertion opening portion 8150m 8150m andand a development a development shaftshaft insertion openingportion insertion opening portion 8150p 8150p forfor receiving receiving the rotational the rotational force from the force from thedrive driveshaft shaft of of thethe apparatus apparatus mainmain assembly. assembly. 15 15 The opening The opening 8150m 8150m is is provided provided with with a a tapered tapered driving drivingshaft shaft receiving receiving surface surface 8150f. On the 8150f. On the cylindrical cylindrical inner inner surface, surface, aa plurality of plurality ofdriven drivenprojections projections 8150d 8150d (8150d (8150d 1 or 18150d or 8150d 2 or 2 or 8150d3, 8150d3, 8150d4) 8150d4) in in the the form form of of ribs ribs are are disposed. In disposed. In addition, in addition, in Figure Figure 51 51 (a),aarotational (a) rotationalforce forcetransmitting transmitting surface(rotational 20 surface 20 (rotationalforce forcereceiving receivingportion) portion)8150e1-e4 8150e1-e4isis provided downstream provided downstreamofof the the projection projection 8150d 8150d with with respect respect to to the the clockwise clockwise direction. And,the direction. And, therotational rotationalforce force(driving (driving force) is transmitted force) is transmittedbyby thethe contact contact of the of the pin pin 182the 182 of of the drive shaft drive shaft180 180totothe the transmitting transmitting surface surface 8150e1-e4 8150e1-e4 to the to the 25 25 coupling 8150. coupling 8150.

[0372]

[0372] The opening8150p The opening 8150pisisprovided provided with with a tapered a tapered development development bearing bearing surface surface 8150i 8150i similarly. similarly. In Inaddition, addition,the the cylindrical innersurface cylindrical inner surface is is provided provided withwith the the rib-like rib-like projections 8150g projections 8150g 1 1 or or 8150g2. 8150g2. InInaddition, addition,ininFigure Figure5050(b) (b) 30 30 a transmittingsurface a transmitting surface (rotational (rotational force force transmitting transmitting portion) portion) 8150h 8150h 11 or or 8150h2 8150h2isisprovided provided in in an an upstream upstream position position of the of the

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developmentdrive development drivestandby standby opening opening 8150g 8150g 1 or1 8150g2 or 8150g2 with with respect to clockwise respect to clockwisedirection. direction.

[0373]

[0373] Referring to Referring toFigure Figure52, 52, thethe description description willwill be be made about made aboutthe theengaging engaging operation operation of the of the coupling. coupling. 2024200580

5 5 [0374]

[0374] Figure 52 (a) Figure 52 (a)isisa asectional sectional view view illustrating illustrating a a state beforeengaging state before engagingwith with thethe drive drive shaft shaft 180 180 afterafter the the movements of movements ofthe thedevelopment development shaft shaft 180 180 and and the coupling the coupling 8150 8150 in in the the rotational rotational direction direction X4. The axis X4. The axis L2 L2 inclines inclines to to the the angle alpha7 7SOsothat angle alpha thata a downstream downstream freefree end end position position 8150A1 8150A1 10 10 withrespect with respectto tothe therotational rotationaldirection directionX4 X4can canpass passthe thefree free end portion end portion 180b. 180b. At Atthis thistime, time,The Theupstream upstream182a 182aand andthe the downstream 182bofofthe downstream 182b the pin pin 182182 maintain maintain the the engaged engaged statestate with with the transmittingsurface the transmitting surface (rotational (rotational force force receiving receiving portion) portion) 8150h 8150h 11 or or 8150h2 8150h2(Figure (Figure 51c) 51c) of of thethe coupling coupling 8150.8150.

15 15 [0375]

[0375] Figure 52 (b) Figure 52 (b)illustrates illustratesthethe coupling coupling 150 150 having been having beendescribed described with with respect respect to Embodiment to Embodiment 1, in1,the in the orientation orientation the the same same as as Figure Figure 52 52 (a). (a) AsAs will will bebe understood understood from from Figure Figure 52 52 (b), the axis (b) the axis L2 L2 of of the the coupling coupling 150 150 is is inclined inclined by by the the angle angle alpha alpha 7 7 similarly similarly to to Figure Figure 52 52 (a). (a) ByBy 20 20 this, this, the the engagement engagement between between upstream upstream pin pin 155 155 and and the the upstream upstream drive transmission drive transmissionsurface surface 8150h1 8150h1 is not is not established established with with respect respect to to rotational rotational direction direction X4. X4. InIn other other words, words, there there is is a gap of a gap of G7 G7between betweenthe the pinpin 155155 andand the the transmitting transmitting surface surface 150h1. 150h1. OnOnthe theother otherhand, hand,in inthe thepresent presentembodiment, embodiment,thethe coupling8150 25 coupling 25 8150has hasthe thecontact contactportions portionsfor forthe therotational rotational force force transmission transmission at at the the two two places as shown places as shown in in Figure Figure 52(a). For this 52 (a) For this reason, reason, the the orientation orientation of of the the coupling coupling is is further stabilized. further stabilized.

[0376]

[0376] As has As has been beendescribed described hereinbefore, hereinbefore, the the coupling coupling 30 30 has a has a cylindrical cylindrical shape. shape. By Bythis, this,even evenif ifit itis isnecessary necessaryto to

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increase theinclination increase the inclination angle angle (pre-engagement (pre-engagement angular angular position) of position) ofthe thecoupling, coupling, thethe contact contact portions portions for the for the rotational forcetransmission rotational force transmission in in thethe two two places places are assured. are assured. Therefore, theinclination Therefore, the inclination operation operation of the of the stabilized stabilized 5 5 coupling canbebeaccomplished. coupling can accomplished. 2024200580

[0377]

[0377] Since the co-axial Since the co-axialrotational rotational force force transmission transmission between the between the drive drive shaft shaft 180 180 and and the the development development shaft shaft 153 153 and and the engagementreleasing the engagement releasing operation operation between between themthem are same are the the same as that of as that of Embodiment Embodiment1,1, those those descriptions descriptions are are omitted omitted for for 10 10 simplicity. simplicity.

[Embodiment 7]

[0378]

[0378] Referring to Referring toFigure Figure53, 53, thethe seventh seventh embodiment embodiment of of the presentinvention the present inventionwill will be be described. described.

[0379]

[0379] The present The present embodiment embodiment isis different different from from 15 15 Embodiment 1 Embodiment 1 in in the the configuration configuration of of the the coupling. coupling. Figure Figure 53(a) 53 (a) is is a a perspective viewofofa acoupling perspective view coupling which which has has a a generally cylindrical generally cylindrical shape, shape, andand Figure Figure 53 (b) 53 (b) is a is a sectional sectional view when view when the thecoupling coupling mounted mounted to to the the cartridge cartridge engages engages with a with a drive shaft. drive shaft.

20 20 [0380]

[0380] In Figures 53 In Figures 53(a) and 53 (a) and 53(b), the rotational (b), the rotationalforce force is inputted from is inputted fromthe themain main assembly assembly at the at the righthand righthand side,side, and and the developingroller the developing rolleratat thethe lefthand lefthand is driven. is driven.

[0381]

[0381] An input An input side sideedge edgeofof the the coupling coupling 91509150 is is provided with provided witha aplurality pluralityof of driven driven projections projections (rotational (rotational 25 25 force force receiving receiving portions) portions) 9150d. In this 9150d. In this embodiment, embodiment, they they are are provided at provided at two two positions. Entering positions. Enteringportions portionsororentrances entrances 9150k is provided 9150k is providedbetween between thethe drive drive receiving receiving projections projections 9150d. The projection 9150d. The projection 9150d 9150d isis provided provided with with aa rotational rotational

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force receivingsurface force receiving surface (rotational (rotational force force receiving receiving portion) portion) 9150e. 9150e. AA rotational rotational force force transmitting transmitting pin pin (rotational (rotational force force applying portion)9182 applying portion) 9182 of of thethe drive drive shaft shaft 91809180 as will as will be be described hereinafter described hereinafter contacts contacts to to the the rotational rotational forceforce 5 5 receiving receiving surface surface 9150e. By this, 9150e. By this, aa rotational rotational force force is is transmitted tothe transmitted to thecoupling coupling 9150. 9150. 2024200580

[0382]

[0382] In order to In order to stabilize stabilizethethe torque torque transmitted transmitted to to the coupling,a aplurality the coupling, plurality of of rotational rotational force force receiving receiving surfaces 150eare surfaces 150e aredesirably desirably disposed disposed on the on the samesame circumference circumference 10 10 (on (on aa common common circle). circle) ByBythe thedisposition dispositionininthis thismanner, manner,the the rotational forcetransmission rotational force transmission radius radius is constant is constant and the and the torque torque transmitted transmitted is is stabilized. stabilized. AAsudden suddenincrease increaseofofthe the torque torque can can be be avoided. avoided. InIn addition, addition, from from the the viewpoint viewpoint of of the the stabilization stabilization ofofthe thedrive drive transmission, transmission, the the receiving receiving 15 15 surfaces 9150eare surfaces 9150e aredesirably desirably provided provided on the on the opposed opposed positions positions (180 (180 degrees) degrees) diametrically. diametrically. In In addition, addition, the the number number of of the the receiving surfaces9150e receiving surfaces 9150emaymay be be anyany if the if the pin pin 9182 9182 of the of the drive shaft drive shaft9180 9180can canbebe received received by the by the standing-by standing-by portion portion 9150k. 9150k. InIn the the present present embodiment, embodiment, the the number number is is two. two. The The 20 20 rotational forcereceiving rotational force receiving surfaces surfaces 9150e 9150e may may notonbethe not be on the same circumference,oror same circumference, they they maymay notnot be disposed be disposed diametrically diametrically opposed positions. opposed positions.

[0383]

[0383] In addition,the In addition, thecylinder cylinder surface surface of the of the coupling coupling 9150 9150 is is provided provided with with the the standby standby opening opening 9150g. In 9150g. In addition,ananopening 25 addition, 25 opening9150g 9150gisisprovided providedwith withthe therotational rotational force transmissionsurface force transmission surface (rotational (rotational force force transmitting transmitting portion) 9150h. portion) 9150h. The Thedrive drivetransmission transmissionpin pin(rotational (rotationalforce force receiving member)9155 receiving member) 9155(Figure (Figure 53 53 (b)(b)) ) of of thethe development development shaft 9153 contacts shaft 9153 contactstoto this this rotational rotational force force transmission transmission 30 30 surface surface 9150h. By this, 9150h. By this, the the rotational rotational force force is is transmitted transmitted to the developing to the developingroller roller 110110 from from thethe mainmain assembly assembly A. A.

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[0384]

[0384] Similarly tothe Similarly to theprojection projection 9150d, 9150d, the the rotational forcetransmission rotational force transmission surface surface 9150h 9150h is desirably is desirably disposed diametrically disposed diametrically opposed opposed on on the the samesame circumference. circumference.

[0385]

[0385] The configurationsofofthe The configurations the development development shaft shaft 91539153 5 5 and the drive and the driveshaft shaft9180 9180 will will be be described described (Figure (Figure 53(b)). 53 (b) ) . In In 2024200580

Embodiment Embodiment 1, 1, the the cylindrical cylindrical end end is is a a spherical spherical surface. In surface. In this embodiment,however, this embodiment, however, a diameter a diameter of aofspherical a spherical free free end end portion 9153b portion 9153bofofthe theend end portion portion is larger is larger thanthan a diameter a diameter of of a a main main part part 9153a. Withthis 9153a. With thisconfiguration, configuration,the theleft leftend end 10 portionof 10 portion ofthe thecoupling coupling9150 9150can canincline inclinewithout withoutinterference interference with the with the major major part part 9150a. 9150a. The Theconfiguration configurationof ofthe thedrive drive shaft 9180 is shaft 9180 isthe thesame sameasas that that of of thethe development development shaftshaft 9150 9150 substantially. substantially. In In other other words, words, the the configuration configuration of of the the free free end portion end portion9180b 9180bisisthe the spherical spherical surface, surface, and diameter and the the diameter 15 15 thereof is larger thereof is largerthan than thethe diameter diameter of the of the mainmain part part 9180a9180a of of the the cylindrical cylindrical shape shape portion. portion. InIn addition, addition, the the pin pin (rotational forceapplying (rotational force applying portion) portion) 9182 9182 which which pierces pierces through through the substantialcenter the substantial centerofof thethe free free end end portion portion 9180b9180b whichwhich is is the the spherical spherical surface surface is is provided. provided. TheThepin pin9182 9182 transmits transmits 20 20 the rotationalforce the rotational forcetoto the the transmitting transmitting surface surface or rotational or rotational force receivingsurface force receiving surface 9150e 9150e of of thethe coupling coupling 9150. 9150.

[0386]

[0386] The developmentshaft The development shaft9150 9150 andand thethe spherical spherical surface of the surface of thedrive driveshaft shaft 9180 9180 areare in engagement in engagement with with the the inner inner surface surface 9150p 9150p of of the the coupling coupling 9150. 9150. ByBy this, this, the the 25 25 relative positionbetween relative position betweenthethe development development shaft shaft 9150 9150 and the and the coupling coupling 9150 9150 of of the the drive drive shaft shaft 9180 9180 is is determined. The determined. The operation withrespect operation with respectto to thethe mounting mounting and and demounting demounting of the of the coupling 9150relative coupling 9150 relativetoto thethe drive drive shaft shaft 91809180 is same is the the same as as Embodiment 1, Embodiment 1,and andtherefore, therefore,thethe description description thereof thereof is is 30 30 omitted forsimplicity. omitted for simplicity.

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[0387]

[0387] As has As has been beendescribed described hereinbefore, hereinbefore, the the coupling coupling has the has the cylindrical cylindricalshape, shape, andand therefore, therefore, the the position position with with respect to the respect to thedirection direction perpendicular perpendicular to the to the direction direction of the of the axis L2 of axis L2 of the thecoupling coupling 9150 9150 cancan be be determined determined if coupling if the the coupling 5 5 is engaged with is engaged withthe theshaft. shaft. 2024200580

[0388]

[0388] A modified A modifiedexample exampleofof the the coupling coupling willwill be be described further. described further. In Inthe theconfiguration configurationofofthe thecoupling coupling9250 9250 shown shown in in Figure Figure 53 53 (c), (c) aacylindrical cylindricalshape shapeand andaaconical conical shape shape are are put put together. Figure53 together. Figure 53(d) (d)isisaasectional sectionalview viewofof 10 10 thecoupling the couplingofofthis thismodified modifiedexample. example.A driven A driven portion portion 9250a 9250a of the coupling of the coupling9250 9250(righthand (righthand side side in the in the Figure) Figure) has ahas a cylindrical shape,and cylindrical shape, and an an inner inner surface surface 9250p 9250p thereof thereof engages engages with the with the spherical sphericalsurface surface of of thethe drive drive shaft shaft 9180.9180. Furthermore, Furthermore, itithas hasthe the abutment abutment surface surface 9250q 9250q and effect and can can effect 15 15 the positioningwith the positioning withrespect respect to to thethe axial axial direction direction between between the the coupling coupling 9250 9250 and and the the drive drive shaft shaft 180. Thedriving 180. The driving portion 9250b portion 9250bhas hasa aconical conical shape shape (lefthand (lefthand side side of the of the Figure), and,similarly Figure), and, similarlyto to Embodiment Embodiment 1, the 1, the position position relative relative to the development to the developmentshaft shaft 153153 is is determined determined by development by the the development 20 20 shaft receivingsurface shaft receiving surface 9250i. 9250i.

[0389]

[0389] The configurationofofthe The configuration the coupling coupling 9350 9350 shown shown in in Figure 53 (e) Figure 53 (e)isisa acombination combination of of a cylindrical a cylindrical shapeshape and aand a conical conical shape. Figure53 shape. Figure 53(f) (f)isisaasectional sectionalview viewof ofthis this modified example. modified example. TheThedriven drivenportion portion9350a 9350aofofthe thecoupling coupling 25 25 9350 has aa cylindrical 9350 has cylindricalshape shape (righthand (righthand side), side), , andand thethe inner inner surface 9350pthereof surface 9350p thereofengages engages with with the the spherical spherical surface surface of of the the drive drive shaft shaft 9180. 9180. TheThepositioning positioningin inthe theaxial axialdirection direction of the drive of the driveshaft shaft9180 9180 is is effected effected by abutting by abutting the spherical the spherical surface 9180cofofthe surface 9180c thedrive drive shaft shaft 9180 9180 to the to the edgeedge portion portion 30 30 9350q formedbetween 9350q formed betweenthethe cylindrical cylindrical portions portions having having different different diameters. diameters.

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[0390]

[0390] The configurationofofthe The configuration the coupling coupling 9450 9450 shown shown in in Figure 53 (g) Figure 53 (g)isisa acombination combination of of a spherical a spherical surface, surface, a a cylindrical cylindrical shape, shape, and and a a conical conical shape. Figure53 shape. Figure 53(h) (h)is isaa sectional viewofofthis sectional view this modified modified example, example, wherein wherein a driven a driven 5 5 portion 9450a portion 9450aofofthe thecoupling coupling 9450 9450 (righthand (righthand side)side) has ahas a cylindricalshape, cylindrical shape,and and the the inner inner surface surface 9450p 9450p thereof thereof engages engages 2024200580

with the with the spherical spherical surface surface 9450q 9450q of of the the drive drive shaft. shaft. A A spherical surfaceofofthe spherical surface the drive drive shaft shaft 180 180 is contacted is contacted to a to a spherical surface9450q spherical surface 9450q which which is is a part a part of the of the spherical spherical 10 surface.By By 10 surface. this, this, thethe position position cancan be be determined determined with with respect respect to to the the direction direction of of the the axis axis L2. Designatedby L2. Designated by9250d, 9250d,9350d, 9350d, 9450d 9450d are are projections. Designated by projections. Designated by 9250e, 9250e, 9350e 9350e and and 9450e 9450e are rotationalforce are rotational forcereceiving receiving surfaces surfaces (rotational (rotational forceforce receiving portion). receiving portion).

15 15 [Embodiment 8]

[Embodiment 8]

[0391]

[0391] Referring to Referring toFigure Figure5454 - Figure - Figure 56,56, the the eighth eighth embodiment ofthe embodiment of thepresent present invention invention willwill be described. be described.

[0392]

[0392] The The present present embodiment embodiment is is different different from from Embodiment Embodiment 11ininthe themounting mounting operation operation relative relative to drive to the the drive shaftofofthe 20 shaft 20 thecoupling, coupling,and andthe thestructure structurewith withrespect respecttotoit. it. Figure 54 Figure 54 is isa aperspective perspective view view which which illustrates illustrates a a configuration configuration ofofa acoupling coupling 10150 10150 of the of the present present embodiment. embodiment. The configuration The configurationofofthe the coupling coupling 10150 10150 is ais a combination combination of of the cylindricalshape the cylindrical shapeand and conical conical shape shape which which have have been been 25 25 described in described in Embodiment Embodiment 7.7. InInaddition, addition,aatapered taperedsurface surface 10150r is provided 10150r is providedononthe the free free endend side side of aofcoupling a coupling 10150. 10150. In addition,the In addition, thesurface surfaceof of an an opposite opposite sideside of drive of the the drive receiving projection10150d receiving projection 10150d with with respect respect to the to the direction direction of of the axis L1 the axis L1is isprovided provided with with an an urging urging force force receiving receiving surface surface 30 30 10150s. 10150s.

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[0393]

[0393] Referring to Referring toFigure Figure55, 55, thethe structure structure of the of the coupling willbebedescribed. coupling will described.

[0394]

[0394] An inner An inner surface surface10150p 10150p andand a spherical a spherical surface surface 10153b of aadevelopment 10153b of development shaft shaft 10153 10153 of the of the coupling coupling 1015010150 are are 5 5 in in engagement engagement with with each each other. other. AnAn urging urging member member 10634 10634 is is 2024200580

interposed betweenananurging interposed between urging force force receiving receiving surface surface 10150s 10150s described in described inthe theforegoing foregoing andand a bottom a bottom surface surface 10151b 10151b of a of a development flange development flange 10151. 10151. By Bythis, this,the thecoupling coupling10150 10150isis urged towardthe urged toward thedrive drive shaft shaft 180180 when when the the rotary rotary C is Cstopped is stopped 10 10 at at the the predetermined predetermined position. position. InInaddition, addition,similarly similarlytotothe the foregoing embodiments, foregoing embodiments, a retention a retention rib rib (unshown) (unshown) is provided is provided adjacent tothe adjacent to thedrive driveshaft shaft 180180 on on the the flange flange portion portion 10150j 10150j with respect with respect to to the the direction direction of of the the axis axis L1. L1. By Bythis, this,the the disengagement disengagement ofofthe thecoupling coupling 10150 10150 fromfrom the the cartridge cartridge is is 15 15 prevented.The prevented. The inner inner surface surface 10150p 10150p of of the the coupling coupling 10150 10150 is is cylindrical. Therefore, cylindrical. Therefore,the thecoupling couplingisismounted mountedto tothe the cartridge cartridge BBSO soasastotobebe movable movable in in the the direction direction of axis of the the axis L2. L2.

[0395]

[0395] Figure 56 is Figure 56 isfor forillustrating illustrating thethe orientation orientation of of 20 20 the couplingininthe the coupling thecase case that that thethe coupling coupling engages engages with with the the drive shaft. drive shaft. Figure Figure5656(a) (a)isisaasectional sectionalview viewofofthe the coupling 150ofofEmbodiment coupling 150 Embodiment 1, 1, andand Figure Figure 56 (c) 56 (c) is a is a sectional sectional view of view of aa coupling coupling 10150 10150 of of the the present present embodiment. embodiment. And, And, Figure 56 (b) Figure 56 (b)isisa asectional sectional view view before before reaching reaching the state the state of of 25 25 Figure 56 (c) Figure 56 (c)the therotational rotational direction direction is shown is shown by X4byand X4 the and the chain line L5 chain line L5isisa aline line drawn drawn in in parallel parallel withwith the mounting the mounting direction from direction fromthe thefree free endend of of thethe drive drive shaft shaft 180. 180.

[0396]

[0396] In order for In order forthe thecoupling couplingto to engage engage withwith the the drive shaft drive shaft180, 180,the thedownstream downstream free free end end position position 10150A1 10150A1 with with 30 30 respect to the respect to therotational rotationalX4 X4 direction direction needs needs to pass to pass the free the free end end portion portion 180b3 180b3 of of the the drive drive shaft shaft 180. Inthe 180. In thecase caseof of

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Embodiment 1, Embodiment 1,the theaxis axis L2 L2 inclines inclines by more by more thanthan angleangle x104.α104. By this, By this, the thecoupling coupling moves moves to to thethe position position where where the free the free end end position 150A1 position 150A1does doesnot not interfere interfere with with the the freefree end portion end portion 180b3 180b3 (Figure (Figure 56 56 (a), pre-engagement angular (a) pre-engagement angular position) position).

5 5 [0397]

[0397] On the On the other otherhand, hand,inin the the coupling coupling 10150 10150 of the of the 2024200580

present embodiment, present embodiment,itit in in thethe state state where where it does it does notinbe in not be engagement withthe engagement with thedrive drive shaft shaft 180, 180, the the coupling coupling 1015010150 takestakes the positionnearest the position nearesttoto the the drive drive shaft shaft 180 180 by aby a restoring restoring (elastic) forceof (elastic) force ofananurging urging member member (elastic (elastic member) member) 10634. 10634. 10 10 In this state, In this state,when whenitit moves moves in in thethe rotational rotational direction direction X4, a X4, a part of part of the thetapered taperedsurface surface 10150r 10150r of the of the coupling coupling 1015010150 contacts thedrive contacts the driveshaft shaft (Figure (Figure 56 56 (b) (b)). ) . At At this this time, time, the the force is applied force is appliedtotothe the tapered tapered surface surface 10150r 10150r in the in the direction X4, direction X4,and andtherefore, therefore,thethe coupling coupling 10150 10150 is retracted is retracted 15 15 in the longitudinal in the longitudinaldirection direction X11X11 bycomponent by a a component forceforce thereof. And, the thereof. And, the free free end end portion portion 10153b 10153b of of the the development development shaft 10153abuts shaft 10153 abutstotoanan abutting abutting portion portion 10150t 10150t of the of the coupling coupling 10150. Inaddition, 10150. In addition,the thecoupling coupling10150 10150rotates rotates clockwisely aboutthe clockwisely about thecenter center P1 P1 of of the the freefree end end portion portion 10153b 10153b 20 20 (pre-engagement angularposition) (pre-engagement angular position) of of thethe development development shaft. shaft. By this, By this, the thedownstream downstream free free endend position position 10150A1 10150A1 of the of the coupling withrespect coupling with respecttoto thethe rotational rotational direction direction X4 passes X4 passes by by the free end the free end180b 180bofofthe the drive drive shaft shaft 180 180 (Figure (Figure 56 )(c)). 56 (c) . When the When the drive driveshaft shaft180180 andand thethe development development shaftshaft 1015310153 25 25 becomes substantially becomes substantially co-axial, co-axial, a driving a driving shaft shaft receiving receiving surface 10150fofofthe surface 10150f thecoupling coupling 10150 10150 contacts contacts to free to the the free end end portion 180b portion 180bbybythe theelastic elastic force force of the of the urging urging spring spring 10634. 10634. By this, By this, the thecoupling coupling becomes becomes in in thethe rotation rotation latency latency statestate (Figure 55).. In (Figure 55) Inconsideration considerationof of an an amount amount of retraction of retraction of of 30 30 the coupling10150, the coupling 10150,the the degree degree of of inclination inclination of axis of the the axis L2 L2 can be reduced can be reducedtotox106 α106 (Figure (Figure 56 56(c)). (c) ) .

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[0398]

[0398] At the At the time timeofofthe therotary rotary resume resume the the rotation rotation in in said one direction said one directionafter after completion completion of the of the image image forming forming operation, thefree operation, the freeend end portion portion 180b 180b is forced is forced on conical on the the conical shape drivingshaft shape driving shaftreceiving receiving surface surface 10150f 10150f of coupling of the the coupling 5 5 10150 10150 by by rotation rotation force force of of the the rotary. The coupling rotary. The coupling 10150 10150 is is pivoted by pivoted bythis thisforce, force, while while retracting retracting toward toward the direction the direction 2024200580

(opposite (opposite to to X11 X11 direction) direction) of of the the axis axis L2 L2 by by this. The this. The coupling 10150isisdisengaged coupling 10150 disengaged (disconnected) (disconnected) fromfrom the drive the drive shaft 180. shaft 180.

10 10 Embodiment 9: Embodiment 9:

[0399]

[0399] Referring to Referring toFigure Figure57, 57, Figure Figure 58,58, and and Figure Figure 59, ,59,, embodiment embodiment 99will willbebedescribed. described.

[0400]

[0400] The The present present embodiment embodiment is is different different from from Embodiment 11ininposition Embodiment position (position (position of the of the coupling) coupling) for for 15 15 inputting therotational inputting the rotational force, force, andand structure structure for transmitting for transmitting the rotationalforce the rotational forcetoto developing developing roller roller and and developer developer supply supply roller from coupling. roller from coupling.

[0401]

[0401] Figure 57 is Figure 57 isa aperspective perspective view view of of the the cartridge cartridge B. In B. Inaddition, addition,Figure Figure5858is isaaperspective perspectiveview viewillustrating illustrating

20 a adriving 20 drivingportion portionof ofthe thecartridge cartridgeB Bwithout withoutthe theside sideplate. plate. Figure 59 (a) Figure 59 (a)isisa aperspective perspective view view of aofdriving a driving inputinput gear,gear, as as seen seen from from the the driving driving side. Figure59 side. Figure 59(b) (b)is isaaperspective perspective view of view of aa driving drivinginput input gear, gear, as as seenseen fromfrom the the non-driving non-driving side. side.

25 25 [0402]

[0402] A development A developmentgear gear145 145 is is provided provided to the to the one one longitudinal longitudinal end end of of a a developing developing roller roller 110. Inaddition, 110. In addition,aa developer supply developer supplyroller roller gear gear 146146 is is provided provided to one to the the one longitudinal endofofthe longitudinal end the developer developer supply supply roller roller 115 (Figure 115 (Figure 1). Both the 1). Both the gears gears are are fixed fixed on on the the roller roller shafts. shafts. ByBy this, this,

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the rotationalforce the rotational forcereceived received by by thethe coupling coupling 150 from 150 from the the apparatus mainassembly apparatus main assembly A is A is transmitted transmitted to the to the pin pin (rotational (rotational force force receiving receiving portion) portion) 155 155 and and the the gear gear 147. In 147. In addition, therotational addition, the rotational force force received received by the by the gear gear 147 is 147 is 5 5 transmitted tothe transmitted to thedeveloping developing roller roller 110 110 and and the developer the developer supply supply roller roller 115 115 through through the the gear gear 145 145 and and the the gear gear 146. The 146. The 2024200580

rotational forcemay rotational force maybebe transmitted transmitted to the to the developer developer stirring stirring member and member and SO so on. on. InInaddition, addition,the themember memberfor fortransmitting transmitting the rotationalforce the rotational forcemay may notnot be be a gear, a gear, but but may may be a be a toothed toothed 10 10 belt belt and and so SO on. Thedriving on. The drivingforce forcetransmitting transmittingmembers, members,such such as the gear as the gearor orthe thetoothed toothed belt, belt, areare usable usable properly. properly.

[0403]

[0403] Referring Referring to to Figure Figure 59,, thedriving 59, the drivinginput inputgear gear 147 which mounts 147 which mountsthe thecoupling coupling150150 swingably swingably willwill be described. be described. A gear A gear shaft shaft11153 11153isis fixed fixed by by thethe press-fitting, press-fitting, the bonding, the bonding, 15 15 and and so SO on on to to the the inside inside of of the the gear. Theend gear. The end11153b 11153bthereof thereof has has aa spherical sphericalconfiguration, configuration, SO so that that it can it can incline incline smoothly smoothly when when the axis the axis L2 L2 inclines. inclines. In In this this embodiment, embodiment, although although the the gear gear shaft 11153 shaft 11153isismade made of of metal, metal, it may it may be made be made of resin of resin material integral material integral with with the the gear gear 147. 147. In Inaddition, addition,The The 20 20 rotational forcetransmitting rotational force transmitting pinpin (rotational (rotational force force receiving receiving portion) 155for portion) 155 forreceiving receiving thethe rotational rotational force force from from the the coupling 150isisprovided coupling 150 providedat at thethe free free end end sideside of gear of the the gear shaft 11153,and shaft 11153, andititisis extended extended in in the the direction direction crossing crossing with with the axis of the axis ofthe thegear gearshaft shaft 11153. 11153.

25 25 [0404]

[0404] The pin 155 The pin 155is ismade madeofof the the metal metal andand is fixed is fixed by by the press-fitting,the the press-fitting, the bonding, bonding, andand so to SO on on the to gear the gear shaftshaft 11153. 11153. IfIf the the transmission transmission ofof the the rotational rotational force force is is possible, the possible, theposition positionof of thethe pinpin 155 155 is satisfactory is satisfactory anywhere. Preferably,the anywhere. Preferably, thepin pin155 155penetrates penetratesthe thespherical spherical 30 30 surface centerofofthe surface center thefree free endend portion portion 11153b 11153b of gear of the the gear shaft shaft 11153. Thisis 11153. This isbecause, because,with withsuch suchaastructure, structure,even even when the when the angle angleofofdeviation deviation exists exists between between the the gear gear shaftshaft

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11153 and the 11153 and theaxis axisL2, L2, the the rotational rotational force force transmission transmission radius radius is is always always constant. By this, constant. By this, constant constant transmission transmission of of the the rotational rotational force force is is accomplished. accomplished. TheThenumber numberof of rotational forcetransmission rotational force transmission points points may may be any, be any, and the and the 5 5 person skilled person skilled in in the the art art can can select select it it properly. properly. However, However,in in this embodiment,the this embodiment, thesingle single pinpin 155155 is employed is employed from from the the 2024200580

viewpoint of viewpoint ofassured assuredtransmission transmission of driving of driving torque, torque, and and assembling assembling property. And,the property. And, thepin pin155 155penetrates penetratesthe thecenter center of of the the free free end end spherical spherical surface surface 11153b. Bythis, 11153b. By this,the thepin pin 10 10 155projects 155 projectsininthe thediametrically diametricallyopposite-directions opposite-directionsfrom fromthe the peripheral surface peripheral surface of of the the gear gear shaft shaft 11153. 11153. In Inother otherwords, words, the the rotational rotational force force is is transmitted transmitted atat the the two two places. Here, places. Here, in this embodiment, in this embodiment,although although thethe pinpin 155 155 is metal, is metal, it be it may may a be a product made product madeofofresin resin material material integral integral withwith the gear the gear shaftshaft 15 15 11153 11153 and and the the gear gear 147. The gears 147. The gears 145, 145, 146, 146, and and 147 147 are are helical gears. helical gears.

[0405]

[0405] In addition,since In addition, sincethe the mounting mounting method method of the of the coupling 150isisthe coupling 150 thesame same as as that that of of Embodiment Embodiment 1, the 1, the description isomitted. description is omitted.

20 20 [0406]

[0406] The gear The gear 147 147isisprovided provided with with a space a space 147a147a for for receiving thecoupling receiving the coupling 150 150 partially, partially, so that SO that it does it does not not interfere withthe interfere with thegear gear 147, 147, when when thethe coupling coupling 150 swings 150 swings (the (the movement, pivoting). movement, pivoting). The Thespace space147a 147aisisprovided providedat atthe thecenter center portion of portion of the the gear gear 147. 147. By Bythis, this,ititis ispossible possibletotoshorten shorten thelength 25 the 25 lengthofofthe thecoupling coupling150. 150.Furthermore, Furthermore,as as forfor thethe mounting method mounting methodofofthe the gear gear 147, 147, a hole a hole 147b147b (Figure (Figure 59 (b)59) (b)) is rotatablysupported is rotatably supportedbyby thethe supporting supporting shaft shaft (unshown) (unshown) of of the the development development bearing bearing 11151 11151 (Figure (Figure 58). 58) InIn addition, addition, the the cylindrical portion147c cylindrical portion 147c is is rotatably rotatably supported supported by inner by the the inner 30 30 surface11157i surface 11157iof ofthe thesupporting supportingmember member11157. 11157.

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[0407]

[0407] Since the engagement, Since the engagement,drive, drive, andand disengagement disengagement of the coupling of the couplingbybythe the rotating rotating operation operation of rotary of the the rotary C are C are the same as the same as that thatofofEmbodiment Embodiment 1, 1, thethe description description is omitted. is omitted.

[0408]

[0408] The means for The means forinclining incliningthethe axis axis L2 L2 to the to the pre-pre- 5 5 engagement angularposition engagement angular position just just before before the the engagement engagement of the of the 2024200580

coupling tothe coupling to thedrive drive shaft shaft maymay employ employ a method a method of of of any any of the the embodiment 22- -embodiment embodiment embodiment 5 described 5 described heretofore. heretofore.

[0409]

[0409] As has As has been beendescribed described with with respect respect to the to the present embodiment, present embodiment,itit is is notnot necessary necessary to dispose to dispose the the 10 10 coupling150 coupling 150totothe theend endco-axial co-axialwith withthethedeveloping developingroller roller 110. More particularly, 110. More particularly, according according to to the the embodiment embodiment described described above, the coupling above, the coupling150150 is is provided provided at the at the position position remote remote from the axis from the axisL1L1ofofthe the developing developing roller roller 110 110 in direction in the the direction perpendiculartotothe perpendicular theaxis axis L1 L1 of of thethe developing developing roller roller 110. 110. 15 15 And, in And, in the thedirection directionof of thethe rotation rotation axisaxis L2, L2, the rotational the rotational force transmittingsurface force transmitting surface (rotational (rotational force force transmitting transmitting portion, and portion, andthe thecartridge cartridge side side rotational rotational force force transmitting transmitting portion) 150h portion) 150hare areprovided provided in in thethe opposite opposite sideside from from the the rotational forcereceiving rotational force receiving surface surface (rotational (rotational forceforce receiving receiving 20 20 portion) 150e. portion) 150e. And, And,the therotational rotationalforce forcereceived receivedby bythe the rotational forcetransmitting rotational force transmitting surface surface 150h150h is transmitted is transmitted to to the developingroller the developing roller110 110 through through the the transmission transmission pin 155 pin 155 (rotational forcereceiving (rotational force receiving portion) portion) andand the the gears gears 145 147 145 and and 147 (driving (driving force force transmitting transmitting member). member) ByBythis, this,the thedeveloping developing 25 25 roller 110 is roller 110 isrotated rotatedbyby thethe rotational rotational force force received received from from the main assembly the main assemblyA Abyby the the coupling coupling 150.150.

[0410]

[0410] According to According tothis thisembodiment, embodiment, thethe latitude latitude of of the design of the design ofthe theapparatus apparatus main main assembly assembly A and A and the cartridge the cartridge B is B is improved. improved. This Thisis isbecause, because,ininthe thecartridge cartridgeB,B,the the 30 30 position of position ofthe thecoupling coupling cancan be be properly properly selected selected irrespective irrespective of the position of the positionofofthe the developing developing roller roller 110.110.

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[0411]

[0411] In addition,ininthe In addition, theapparatus apparatus main main assembly assembly A, A, the positionofofthe the position thedrive drive shaft shaft 180180 can can be properly be properly selected selected irrespective ofthe irrespective of theposition position of of thethe developing developing roller roller 110 in 110 in the state of the state ofthe thecartridge cartridge B mounted B mounted to the to the rotary rotary C. C.

5 5 [0412]

[0412] This is This is effective effectiveinindevelopment development of commercial of commercial 2024200580

products. products.

Embodiment10: Embodiment 10:

[0413]

[0413] Referring to Referring to Figure Figure 60-Figure 60-Figure 69, 69, the the tenth tenth embodiment of embodiment ofthe thepresent present invention invention willwill be described. be described.

10 10 [0414]

[0414] Figure 60 is Figure 60 isa aperspective perspective view view of of the the cartridge cartridge using aa coupling using coupling12150 12150 according according to the to the present present embodiment. embodiment. An outer An outer periphery peripheryofof an an outside outside end end of aofdevelopment a development supporting member supporting member12157 12157 provided provided in the in the driving driving side side functions functions as the cartridge as the cartridgeguides guides 140L1, 140L1, 140L2. 140L2.

15 [0415] 15 [0415] The developing The developingcartridge cartridgeis is dismountably dismountably mounted mounted to the rotary to the rotaryC Cbybythese these cartridge cartridge guides guides 140L1, 140L1, 140L2140L2 and and cartridge guide(unshown) cartridge guide (unshown) provided provided in the in the non-driving non-driving side.side.

[0416]

[0416] In this embodiment, In this embodiment,the the coupling coupling cancan be be integrally handledwith integrally handled with the the development development shaft shaft end member. end member. Here,the 20 Here, 20 thedevelopment developmentshaft shaftend endmember memberisisthe themember membermounted mounted to the end to the end of ofthe thedeveloping developing roller, roller, and and it has it has the function the function of transmittingthe of transmitting therotational rotational force force to the to the other other member member in in the cartridgeB.B. the cartridge

[0417]

[0417] Figure 61 (a) Figure 61 (a)isisa aperspective perspective view view of the of the coupling,asasseen 25 coupling, 25 seenfrom fromthe thedriving drivingside. side.It It is is a perspective a perspective view, as view, as seen seenfrom fromthe the developing developing roller roller sideside of Figure of Figure 61 (b) 61 (b) coupling. Figure coupling. Figure61 61(c) (c)is isaaside sideview viewof ofthe thecoupling couplingas as

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seen in the seen in thedirection directionperpendicular perpendicular to the to the direction direction of the of the axis axis L2. L2. InInaddition, addition,Figure Figure6161(d) (d)is isaaside sideview viewofofthe the coupling, coupling, asas seen seen from from the the driving driving side. Figure 61 side. Figure 61 (e) (e) shows shows a view of a view of the thecoupling, coupling,as as seen seen from from the the developing developing rollerroller 5 5 side. side. InInaddition, addition,Figure Figure61 61(f) (f)is isaasectional sectionalview viewtaken taken along along aa line lineS21-S21 S21-S21ofof Figure Figure 61 61 (d). (d). 2024200580

[0418]

[0418] The coupling The coupling12150 12150ofof the the present present embodiment embodiment is is engaged with engaged withthe thedrive drive shaft shaft 180180 similarly similarly to coupling to the the coupling 150. 150. ToTo receive receive the the rotational rotational force force for for rotating rotating the the 10 developingroller. 10 developing roller.In In addition, addition, it it is is disengaged disengaged from from the the drive shaft drive shaft180. 180.

[0419]

[0419] The couplingside The coupling sidedriven driven portion portion 12150a 12150a of the of the present embodiment present embodimenthas has the the function function and and structure structure similar similar to to those of the those of themember member150a, 150a,andand thethe coupling coupling sideside driving driving 15 15 portion 12150b portion 12150bhas hasthe the function function andand structure structure similar similar to the to the member 150b. member 150b. In Inthis thisembodiment, embodiment,the thedriving drivingportion portion12150b 12150b has the has the spherical sphericaldriving driving shaft shaft receiving receiving surface surface 12150i 12150i SO as so as to be able to be able to tomove moveamong among said said three three angular angular positions positions irrespective irrespective ofofthe therotation rotation phase phase of the of the developing developing roller roller 20 20 110 (Figure 110 (Figure 61 61 (a)(a), , (b)(b), , (c)(c), , (f)(f)). ) .

[0420]

[0420] In addition,the In addition, theintermediate intermediate part part 12150c 12150c has has the functionand the function andstructure structure similar similar to those to those of member of the the member 150c. 150c. InIn addition, addition, the the material material and and SO so on on is is the the same same as as that that of the member. of the member.

25 25 [0421]

[0421] In addition,the In addition, theopening opening 12150m 12150m hashas the the function function and structuresimilar and structure similartoto those those of of the the member member 150m 150m (Figure (Figure 61(f)). 61 (f) ) .

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[0422]

[0422] In addition,the In addition, theprojection projection 12150d 12150d (12150d1-d4) (12150d1-d4) has the has the function functionand andstructure structure similar similar to those to those of element of the the element 150d (Figure6161(a), 150d (Figure (a),(b) (b), (c), , (c) (d)(d)). ) .

[0423]

[0423] The entranceportion The entrance portion12150k 12150k (12150k1-k4) (12150k1-k4) has has the the 5 5 function function andandstructure structuresimilar similar to to those those of the of the element element 150k 150k 2024200580

(Figure (Figure 61 61 (a) (a), , (b) (b), , (c) ,(c), , (d) (d)). ) .

[0424]

[0424] In addition,the In addition, thedriving driving portion portion 12150b 12150b has has the the spherical surfaceSOsothat, spherical surface that, it it cancan move move between between rotational rotational force transmittingangular force transmitting angular position position and and pre-engagement pre-engagement angular angular 10 10 position (or position (ordisengaging disengaging angular angular position) position) relative relative to the to the axis axis L1 L1 irrespective irrespective of the of the rotation rotation phase phase ofof the the developing developing roller roller 110 in the 110 in the cartridge cartridge B5. B5. InIn the the illustrated illustrated example, example, the drivingportion the driving portion12150b 12150b hashas a spherical a spherical retaining retaining portion portion 12150i 12150i concentric concentric with with the the axis axis L2. L2. AA fixing fixing hole hole 12150g 12150g 15 15 penetrated by penetrated by aa transmission transmission pinpin 12155 12155 at at aa position position passing passing through the center through the centerofofthe the driving driving portion portion 12150b 12150b is provided. is provided.

[0425]

[0425] In this embodiment, In this embodiment,thethe coupling coupling 12150 12150 comprises comprises a driven portion a driven portion12150a, 12150a,an an intermediate intermediate partpart 12150c, 12150c, and aand a driving driving portion portion 12150b. Theconnection 12150b. The connectionmethod methodbetween betweenthem them 20 20 will be will be described describedininthe the drum drum flange flange assembly assembly process process hereinafter. hereinafter.

[0426]

[0426] Referring to Referring toFigure Figure62, 62, , an , an example example of aof a development shaftend development shaft endmember member 12151 12151 which which supports supports the coupling the coupling 12150 12150 will will be be described. Figure 62 described. Figure 62 (a) (a) shows shows aa view view ,, as as seen seen 25 25 from the drive from the driveshaft shaftside, side, andand Figure Figure 62 (b) 62 (b) is ais a sectional sectional view taken view taken along along a a line line S22-S22 S22-S22in inFigure Figure62 62(a). (a).

[0427]

[0427] The opening12151g The opening 12151g1 1oror 12151g2 12151g2 shown shown in Figure in Figure 62 (a) forms 62 (a) formsaagroove grooveextended extendedin in a rotational a rotational axis axis direction direction of of a a development development shaft shaft end end member member 12151. 12151. AtAtthe thetime timeofof

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mounting the mounting thecoupling coupling 12150, 12150, thethe rotational rotational force force transmitting transmitting pin (rotational pin (rotationalforce force transmitting transmitting portion) portion) 12155 12155 enters enters this this opening 12151g1 1oror12151g2. opening 12151g 12151g2.

[0428]

[0428] The transmissionpin The transmission pin12155 12155 moves moves inside inside of the of the 5 5 opening opening 12151g 12151g 11 or or 12151g2. 12151g2. By Bythis, this,irrespective irrespectiveofofthe the 2024200580

rotation phaseofofthe rotation phase thedeveloping developing roller roller 110 110 in cartridge in the the cartridge B5, the B5, the coupling coupling12150 12150 is is movable movable between between saidsaid threethree angular angular positions. positions.

[0429]

[0429] In addition,ininFigure In addition, Figure6262 (a)(a), rotational , rotational force force 10 10 receiving surfaces(rotational receiving surfaces (rotational force force receiving receiving portions) portions) 12151h (12151h1 1oror12151h2) 12151h (12151h 12151h2) areare provided provided in clockwise in the the clockwise upstream of upstream of the the opening opening 12151g 12151g 1 1 or or 12151g2. 12151g2. AAside sideofofthe the transmission pin12155 transmission pin 12155ofof thethe coupling coupling 12150 12150 contacts contacts to the to the transmitting transmitting surface surface 12151h. 12151h. ByBy this, this, the the rotational rotational force force is is 15 transmittedto 15 transmitted tothe thedeveloping developingroller roller110. 110.The The transmitting transmitting surfaces 12151h1- -12151h2 surfaces 12151h1 12151h2 have have thethe surfaces surfaces intersected intersected by by the the rotational rotational direction direction of of the the end end member member 12151. 12151. ByBythis, this, the the transmittingsurface transmitting surface 12151h 12151h is is pressed pressed to side to the the side of the of the transmission pin12155, transmission pin 12155, and and rotates rotates about about the the axis axis L1 (Figure L1 (Figure 20 20 62b). 62b).

[0430]

[0430] As shown As shown in in Figure Figure 62 62 (b) (b),the theend endmember member12151 12151 is provided with is provided witha acoupling coupling containing containing section section 12151j 12151j for for accommodating thedrive accommodating the drive transmitting transmitting portion portion 12150b 12150b of the of the coupling 12150. coupling 12150.

25 [0431] 25 [0431] Figure 62 (c) Figure 62 (c)isisa asectional sectional view view illustrating illustrating the step of the step ofassembling assembling the the coupling coupling 12150. 12150.

[0432]

[0432] As for As for the thedriven drivenportion portion 12150a 12150a and and the the intermediate part12150c intermediate part 12150c of of thethe coupling, coupling, the the retaining retaining member member 12156 12156 is is inserted inserted into into the the intermediate intermediate part part 12150c. And, the 12150c. And, the

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driven portion driven portion 12150a 12150a and and the the intermediate intermediate part part 12150c 12150c are are capped in capped in the thedirection directionof of thethe arrow arrow X32 X32 by aby a positioning positioning member 12150q member 12150q (a (a driving driving portion portion 12150b) 12150b) which which has has a a retaining retaining portion 12150i. portion 12150i. The Thepin pin12155 12155penetrates penetratesthe thefixing fixinghole hole 5 5 12150g of the 12150g of thepositioning positioning member member 12150q, 12150q, and and the fixing the fixing hole hole 12150r 12150r of of the the intermediate intermediate part part 12150c. And,the 12150c. And, thepin pin12155 12155 2024200580

fixes the positioning fixes the positioningmember member 12150q 12150q to the to the intermediate intermediate part part 12150c. 12150c.

[0433]

[0433] Figure 62 (d) Figure 62 (d)isisa asectional sectional view view illustrating illustrating 10 10 thestep the stepof offixing fixingthe thecoupling coupling12150 12150to tothe theend endmember member12151. 12151.

[0434]

[0434] The coupling The coupling12150 12150isis moved moved in in thethe X33 X33 direction, andthe direction, and thetransmission transmission part part 12150b 12150b is inserted is inserted in the in the accommodating portion accommodating portion 12151j. 12151j. TheTheretaining retainingmember member12156 12156isis inserted in the inserted in thedirection direction of of an an arrow arrow X33 X33 to it to fix fixtoitthe to end the end 15 15 member member 12151. The 12151. Theretaining retainingmember member12156 12156is isfixed fixedwith withplay play to to the the positioning positioning member member 12150q. Bythis, 12150q. By this,the thecoupling coupling12150 12150 can can change change the the orientation. orientation. In Inthis thismanner, manner,aacoupling couplingunit unit which has which has the thecoupling coupling and and thethe endend member member 12151 12151 integrally integrally is is provided. provided.

20 20 [0435]

[0435] The retaining The retainingportion portion 12156i 12156i mounts mounts the the coupling coupling 12150 so that 12150 SO thatititisismovable movable (pivotable) (pivotable) between between the rotational the rotational force transmittingangular force transmitting angular position, position, the the pre-engagement pre-engagement angular position, angular position, and and the the disengaging disengaging angular angular position. position. InIn addition, the addition, theretaining retaining portion portion 12156i 12156i regulates regulates the movement the movement 25 25 of the of the coupling coupling 12150 12150 inin the the direction direction of of the the axis axis L2. L2. In In other words, other words,the theopening opening 12156j 12156j hashas diameter diameter phi smaller phi D15 D15 smaller than the diameter than the diameterofofthe the retaining retaining portion portion 12150i. 12150i.

[0436]

[0436] Similarly tothe Similarly to theprojection projection 12150d, 12150d, the the rotational forcetransmitting rotational force transmitting surfaces surfaces (rotational (rotational forceforce

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transmitting portions) transmitting portions) 12150h 12150h 1 or 1 or 12150h2 12150h2 are are preferably preferably disposed diametrically disposed diametrically opposed opposed on on the the samesame circumference. circumference.

[0437]

[0437] The coupling The couplingand andthe theend end member member cancan be be integrally integrally treated treated by by the the structure structure asas described described above. By above. By 5 5 this, the handling this, the handlingatatthe the time time of of the the assembly assembly is easy, is easy, and and 2024200580

the improvementofofthe the improvement the assembling assembling property property can can be be accomplished. accomplished.

[0438]

[0438] Referring to Referring toFigure Figure6363 and and Figure Figure 64, 64, , the , the mounting of mounting of the the cartridge cartridge B B will will be be described. described. Figure Figure6363(a) (a) 10 10 is is aa perspective perspectiveview viewofof thethe major major partpart of the of the cartridge cartridge , as , as seen from the seen from thedriving drivingside, side, andand Figure Figure 63 (b) 63 (b) is a is a perspective perspective view thereof view thereof ,, as as seen seen from from the the non-driving non-driving side. side. In In addition, Figure6464isis addition, Figure a sectional a sectional view view taken taken along along a line a line S23-S23 in Figure S23-S23 in Figure6363(a) (a). . TheThe developing developing roller roller 110 is 110 is 15 rotatablymounted 15 rotatably mountedon onthe thedeveloping developingdevice deviceframe frame119. 119.

[0439]

[0439] In the description In the descriptiondescribed described above, above, the the coupling coupling 12150 and the 12150 and theend endmember member 12151 12151 areare assembled assembled to coupling to the the coupling unit. And, unit. And,the theunit unitU10 U10isismounted mountedto tothe thedevelopment developmentshaft shaft 12153 by the 12153 by theside sideofofthe the endend of of thethe developing developing roller roller 110 so 110 SO thatthe 20 that 20 thetransmission transmissionpart part12150a 12150aisisexposed. exposed.And, And,thethe transmission part12150a transmission part 12150a is is assembled assembled through through an inner an inner spacespace 12157b 12157b of of the the supporting supporting member member 12157. 12157. ByBy this, this, the the transmission part12150a transmission part 12150a is is exposed exposed through through the the cartridge. cartridge.

[0440]

[0440] As shown As shown in inFigure Figure64, 64, a positioning a positioning portion portion for for 25 25 the developingroller the developing roller12110 12110 12157e 12157e is provided is provided on the on the supporting supporting member member 12157. 12157. ByBy this, this, the the end end member member 12151 12151 is is retained assuredly. retained assuredly.

[0441]

[0441] Here, as Here, as shown shownininFigure Figure 66,66, thethe axis axis L2 the L2 of of the coupling 12150can coupling 12150 canincline incline in in anyany directions directions relative relative to the to the

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axis axis L1. Figure6(a1) L1. Figure 66(a1) - (a5) - (a5) isis a view a view , as , as seen seen from from the the drive shaft drive shaft(180) (180)side, side, andand Figure Figure 66(b1)- 66 (b1) (b5) - (b5) is is thethe perspective view perspective view thereof. thereof. InInFigure Figure66 66(al) (a1)(b1), (b1),thetheaxis axisL2 L2 is is co-axial co-axial with with the the axis axis L1. Figure 65 L1. Figure 65 (a2) (a2) (b2) (b2) illustrates illustrates 5 5 the coupling12150 the coupling 12150ininthe the upward upward inclined inclined state state from from this this state. Whilethe state. While thecoupling couplinginclines inclinestoward towardthe theposition positionofofthe the 2024200580

opening 12151g, opening 12151g,the thetransmission transmission pinpin 12155 12155 is moved is moved alongalong the the opening 12151g opening 12151g (Figure 66 (Figure 66 (a2) (a2) (b2) (b2)). Asaaresult, ) As result,,,the the coupling coupling 12150 12150 is inclinedabout is inclined aboutthe theaxis axisAX AXperpendicular perpendicularto to 10 10 the opening12151g. the opening 12151g.

[0442]

[0442] In Figure 66 In Figure 66(a3) (a3)(b3) (b3), thecoupling , the coupling 12150 12150 is is inclined inclined rightward. Thus, when rightward. Thus, when the the coupling coupling inclines inclines inin the the orthogonal directionofof orthogonal direction thethe opening opening 12151g, 12151g, the the pin 12155 pin 12155 rotates rotates inside inside of of the the opening opening 12151g. 12151g. TheThe axis axis of of rotation rotation is is 15 15 the axis line the axis lineAYAYofofthe the transmission transmission pin pin 12155. 12155.

[0443]

[0443] The coupling The coupling12150 12150inclined inclined downward downward and and the the coupling inclinedleftward coupling inclined leftward areare shown shown in Figs. in Figs. 66 (a4) 66 (a4) (b4) (b4) and and 66 66 (a5) (a5) (b5). The (b5) The coupling coupling 12150 12150 isis inclined inclined about about the the rotation axisAX, rotation axis AX,AY. AY.

20 20 [0444]

[0444] With respect With respecttotothe thedirection direction different different fromfrom the the inclining direction,and inclining direction, and in in thethe midrange, midrange, the the rotation rotation of the of the circumference circumference ofofthe theaxis axis AX AX andand thethe rotation rotation of the of the circumference circumference ofofAYAYcan can combine combine with with eacheach other, other, so that SO that the the inclination inclination is is permitted. For example, permitted. For example, the the directions directions 25 25 different from different from the inclining the inclining direction direction are are Figures Figures 66 66 (a2) (a2), ,

(a3), (a3), (a4), (a3), (a3), (a4),(a4), (a4),(a5), (a5), (a5), (a5), andand (a2)(a2). In this . In this manner, manner, the axis L2 the axis L2can canbebeinclined inclinedin in anyany directions directions relative relative to the to the axis L1. axis L1.

[0445]

[0445] However, the However, theaxis axisL2L2does does notnot need need to be to be 30 30 necessarilypivotable necessarily pivotable relative relative to to the the axisaxis L1 linearly L1 linearly to the to the

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predetermined angle predetermined angle in in any any directions directions over over 360 360 degrees. degrees. In In that case, for that case, forexample, example, the the opening opening 12151g 12151g is slightly is set set slightly wide in wide in the the circumferential circumferential direction. direction. ByBysuch suchthe thesetting, setting, when the when the axis axisL2L2inclines inclines relative relative to the to the axisaxis L1, the L1, the 5 5 coupling 12150rotates coupling 12150 rotatestoto a slight a slight degree degree about about the axis the axis L2, L2, even if even if it it is isthe thecase case where where it it cannot cannot incline incline to the to the 2024200580

predetermined angle predetermined angle linearly. linearly. ByBythis, this,the theaxis axisL2 L2can canbe be inclined to the inclined to thepredetermined predetermined angle angle relative relative to axis to the the axis L1. L1. In other words, In other words,the theplay play in in thethe rotational rotational direction direction of the of the 10 10 opening 150gcan opening 150g canbebeselected selected properly properly by one by one skilled skilled in the in the art. art.

[0446]

[0446] As has As has been beendescribed described hereinbefore, hereinbefore, (Figure (Figure 64), 64) , the sphericalsurface the spherical surface12150i 12150i contacts contacts to the to the retaining retaining portion portion 12156i. For this 12156i. For this reason, reason, the the rotation rotation axis axis of of the the coupling coupling 15 15 12150 12150 is is on on the the center center P2 P2 of of the the spherical spherical surface surface 12150i. In 12150i. In other words,the other words, theaxis axisL2L2 is is pivotable pivotable irrespective irrespective of the of the phase of phase of the the end end member member 12151. 12151. InInaddition, addition,asaswill willbe be described hereinafter, described hereinafter, in in order order forfor the the coupling coupling 1215012150 to to engage withthe engage with thedrive driveshaft shaft 180, 180, thethe axisaxis L2inclined L2 is is inclined to to 20 20 the downstreamininthe the downstream therotational rotational direction direction X4 relative X4 relative to the to the axis axis L1 L1 just just before before the the engagement. engagement. InInother otherwords, words,asasshown shown in Figure 67, in Figure 67,the theaxis axis L2L2 inclines inclines relative relative to axis to the the axis L1, SOL1, so that the driven that the drivenportion portion 12150a 12150a is is thethe downstream downstream with with respect respect to the rotational to the rotationaldirection direction X4.X4.

25 25 [0447]

[0447] Figure 60 shows Figure 60 showsthe thestate state where where thethe axisaxis L2 is L2 is inclined inclined relative relative to to the the axis axis L1. In addition, L1. In addition, Figure Figure 65 65 is is aa sectional viewtaken sectional view takenalong along a line a line S24-S24 S24-S24 in Figure in Figure 60. 60.

[0448]

[0448] By the By the structure structuredescribed described heretofore, heretofore, the the axisaxis L2 in L2 in the the inclined inclinedstate state shown shown in in Figure Figure 65 also 65 can can also become become 30 30 substantially substantially parallel parallel with with the the axis axis L1. L1. InInaddition, addition,the the maximum possible maximum possible inclination inclination angle angle alpha alpha 4 4 (Figure (Figure 65) 65) between between

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the axis L1 the axis L1and andthe theaxis axis L2 L2 is is determined determined so that SO that the range the range to to the positionwhere the position wherethe the driven driven portion portion 12150a 12150a and the and the intermediate part12150c intermediate part 12150c contact contact to to the the end end member member 1215112151 or or the the supporting supporting member member 12157 12157 is is covered. And,the covered. And, theangle anglealpha alpha 5 5 4 is set 4 is set to to the thevalue valuerequired required forfor the the mounting mounting and demounting and demounting to the apparatus to the apparatusmain mainassembly. assembly. 2024200580

[0449]

[0449] Here, in the Here, in thecase caseofofthe the present present embodiment, embodiment, the the maximum possible maximum possibleinclination inclination angle angle alpha alpha 4 is4 20 isdegrees 20 degrees - 80 - 80 degrees. degrees.

10 10 [0450]

[0450] As has As has been beendescribed described with with respect respect to Embodiment to Embodiment 1, immediatelybefore 1, immediately beforeCartridge Cartridge B (B5) B (B5) is determined is determined to the to the predeterminedposition predetermined positionof of thethe apparatus apparatus mainmain assembly assembly A, or, A, or, substantially simultaneously substantially simultaneously with with it it being being determined determined to the to the predeterminedposition, predetermined position,thethe coupling coupling 12150 12150 and and the drive the drive shaft shaft 15 15 180 180 engage engage with with each each other. More particularly, other. More particularly, the the coupling coupling 12150 and the 12150 and thedrive driveshaft shaft 180180 areare engaged engaged withwith each each otherother immediately beforeororsubstantially immediately before substantially simultaneously simultaneously with with the the stoppage ofthe stoppage of therotary rotaryC. C.

[0451]

[0451] Referring toFigure Referring to Figure67, 67, thethe engaging engaging operation operation 20 20 of of this this coupling coupling 12150 12150 will will be be described. Figure67 described. Figure 67isisaa longitudinal sectional longitudinal sectional view view of of thethe apparatus apparatus mainmain assembly assembly A , A , as seen from as seen fromthe thelower lower part. part.

[0452]

[0452] In the moving In the movingprocess processofof thethe cartridge cartridge B7 the B7 by by the rotary C, the rotary C, theaxis axisL2L2ofof the the coupling coupling 12150 12150 inclines inclines 25 25 beforehandin beforehand inthe thepre-engagement pre-engagementangular angularposition positiontotothe the rotational directionX4X4 rotational direction relative relative to to the the axisaxis L1 (Figure L1 (Figure 67 67 (a)). (a) ) . In In the the direction of the direction of theaxis axisL1, L1, thethe downstream downstream freefree end position12150A1 end position 12150A1with with respect respect to the to the rotational rotational direction direction X4 is X4 is positioned positionedininthe the developing developing roller roller 12110 12110 direction direction side side 30 30 beyond the beyond thedrive driveshaft shaft free-end free-end 180b3 180b3 by the by the inclination inclination of of

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the the coupling coupling 12150. 12150. InInaddition, addition,the theupstream upstreamfree freeend end position 12150A2 position 12150A2with with respect respect to to thethe rotational rotational direction direction X4 X4 is positionedininthe is positioned thepin pin 182182 direction direction sideside thanthan the drive the drive shaft free-end180b3 shaft free-end 180b3(Figure (Figure 67 67 (a)(a)). .

5 [0453] 5 [0453] First, the upstream First, the upstreamfree free endend position position 12150A1 12150A1 2024200580

with respect with respecttotothe therotational rotational direction direction X4the X4 of of coupling the coupling 12150 12150 passes passes by by the the drive drive shaft shaft free-end free-end 180b3. 180b3. AA part part of of coupling (receivingsurface coupling (receiving surface 12150f 12150f and/or and/or projection projection 12150d) 12150d) which is which is the thecartridge cartridge side side contact contact portion portion contacts contacts to the to the 10 10 main assembly main assembly side side engaging engaging portion portion (the (the drive drive shaft shaft 180 180 and/or the pin and/or the pin182) 182), afterthe , after thepassage. passage. The The coupling coupling is is inclined so that inclined SO thatthe theaxis axis L2 L2 becomes becomes parallel parallel to axis to the the axis L1 L1 in response to in response tothe therotation rotation of of thethe rotary rotary C (Figure C (Figure 67 )(c)). 67 (c) . And, when And, when the thedeveloping developing cartridge cartridge B7 finally B7 finally stopsstops at the at the 15 15 predeterminedposition predetermined position (developing (developing position) position) in apparatus in the the apparatus main assembly main assembly AA (stoppage (stoppage of of the the rotation rotation of of the the rotary), rotary), the the drive shaft drive shaft180 180and andthe the developing developing roller roller 12110 12110 will will become become substantially substantially co-axial co-axial with with each each other. And, the other. And, the coupling coupling 12150 is moved 12150 is movedfrom fromthe the pre-engagement pre-engagement angular angular position position toward toward 20 20 the rotationalforce the rotational forcetransmitting transmitting angular angular position position wherewhere the the axis axis L2 L2 is is substantially substantially co-axial co-axial with with the the axis axis L1. And,the L1. And, the coupling 12150and coupling 12150 andthe the drive drive shaft shaft 180 180 are are engaged engaged with with each each other (Figure other (Figure6767(d) (d)). Therecess ) . The recess 12150z 12150z of of the the coupling coupling covers the free covers the freeend endportion portion 180b. 180b.

25 25 [0454]

[0454] As has As has been beendescribed described hereinbefore, hereinbefore, the the coupling coupling 12150 is mounted 12150 is mountedfor forinclining inclining motion motion relative relative to axis to the the axis L1. L1. More particularly, More particularly,thethe coupling coupling 12150 12150 inclines inclines without without interfering withthe interfering with thedrive drive shaft shaft 180180 in response in response to the to the rotating rotating operation operation of of the the rotary rotary C. By this, C. By this, the the coupling coupling 30 30 12150 can be 12150 can beengaged engagedwith with thethe drive drive shaft shaft 180.180.

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[0455]

[0455] Similarly toembodiment Similarly to embodiment1, 1, thethe engaging engaging operation ofthe operation of thecoupling coupling 12150 12150 described described above above cancarried can be be carried out irrespectiveofofthe out irrespective the phase phase of of thethe drive drive shaft shaft 180 the 180 and and the coupling 12150. coupling 12150.

5 5 [0456]

[0456] In this manner, In this manner,ininthis this embodiment, embodiment, the the coupling coupling 2024200580

12150 is mounted 12150 is mountedtotothe the cartridge cartridge B7 for B7 for substantial substantial revolvement relativetoto revolvement relative the the developing developing roller roller 110. 110.

[0457]

[0457] Referring to Referring toFigure Figure68, 68, thethe rotational rotational force force transmitting operation transmitting operation atat thethe time time of rotating of rotating the developing the developing 10 10 roller roller 110 110 will will be be described. Thedrive described. The driveshaft shaft180 180rotates rotates with the with the gear gear(helical (helical gear) gear) 181181 in the in the direction direction of X8ofinX8 in the the Figure by the Figure by therotational rotational force force received received fromfrom the motor the motor 64 64 (driving source). (driving source) Thetransmission . The transmissionpinpin 182 182 integral integral with with the the drive shaft180 drive shaft 180contacts contacts to to twotwo of of the the fourfour rotational rotational forceforce 15 15 receiving surfaces150e receiving surfaces 150e ofof thethe coupling coupling 12150 12150 to rotate to rotate the the coupling coupling 12150. Furthermore,as 12150. Furthermore, asstated statedininthe theforegoing, foregoing,the the coupling 12150isiscoupled coupling 12150 coupled with with thethe developing developing roller roller 110 for 110 for drive drive transmission. transmission. ForForthis thisreason, reason,the therotation rotationofofthe the coupling 12150rotates coupling 12150 rotates the the developing developing roller roller 110 through 110 through the the 20 20 end member end member 12151. 12151.

[0458]

[0458] In addition,even In addition, evenififthe the axis axis L3 L3 andand the the axisaxis L1 L1 deviate fromthe deviate from theco-axial co-axial relations relations somewhat, somewhat, the coupling the coupling can can rotate withoutapplying rotate without applyingthethe large large load load to the to the developing developing roller and the roller and thedrive driveshaft shaft because because the the coupling coupling 1215012150 inclines inclines 25 25 slightly. slightly.

[0459]

[0459] This This isis one oneof ofthe theremarkable remarkable effects effects according according to an embodiment to an embodimentofofthe the coupling coupling of of the the present present invention. invention.

[0460]

[0460] Referring to Referring toFigure Figure69, 69, thethe description description willwill be be made as made as to tooperation operationofof thethe coupling coupling 12150 12150 and and SO onsoatonthe at the

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time of the time of thecartridge cartridgeB B (B7) (B7) moving moving to another to another station station by the by the rotation rotation of of the the rotary rotary C. Figure 69 C. Figure 69 is is aa longitudinal longitudinal sectional viewofofthe sectional view theapparatus apparatus main main assembly assembly A ,seen A , as as seen from from the the lower lower part. First,similarly part. First, similarlytotoembodiment embodiment1, 1,whenever whenever 5 5 the cartridgeB Bmoves the cartridge movesfrom from thethe position position (developing (developing position) position) where opposes where opposestotothe thephotosensitive photosensitive drum, drum, the the pin is pin 182 182 is 2024200580

positionedat positioned atany anytwo two ofof thethe entrance entrance portions portions 12150k1-12150k4 12150k1-12150k4 (Figure 61). (Figure 61) .

[0461]

[0461] In the state In the statewhere wherethetherotary rotary C is C is at rest at rest at at 10 10 the developingposition, the developing position,thethe axis axis L2 the L2 of of the coupling coupling 1215012150 is is substantially co-axial substantially co-axial relative relative to to the the axisaxis L1 (rotational L1 (rotational force transmittingangular force transmitting angular position). position) . WhenWhen the the rotary rotary C C further startsthe further starts therotation rotation to to oneone direction direction after after termination termination of the development, of the development,TheThe upstream upstream receiving receiving surface surface 12150f 12150f with with 15 15 respect to the respect to therotational rotational direction direction X4 and/or X4 and/or the projection the projection 12150d of the 12150d of thecoupling coupling 12150 12150 contact contact to free to free end portion end portion 180b 180b of the drive of the driveshaft shaft180, 180, and/or and/or thethe pin pin 182 182 (Figure (Figure 69a),69a), in in response to the response to themovement movementin in thethe rotational rotational direction direction X4 ofX4 of the the cartridge cartridge BB(developing (developing roller roller 110).. 110) And, the And, the axis axisL2L2begins begins 20 20 (Figure 69b) to (Figure 69b) to incline inclinetoward toward thethe upstream upstream in the in the rotational rotational direction X4. direction X4. The Theinclining incliningdirection direction(pre-engagement (pre-engagementangular angular position) of position) of the the coupling coupling atat the the time time of of the the cartridge cartridge B B moving this moving thisdirection direction to to thethe developing developing position position is the is the substantially substantially opposite opposite relative relative to to the the axis axis L1. By the L1. By the rotatingoperation 25 rotating 25 operationofofthis thisrotary rotaryC,C,the theupstream upstreamfree freeend end portion 12150A2 portion 12150A2with withrespect respect to to thethe rotational rotational direction direction X4 X4 moves, while moves, while it it is is in in contact contact with with the the drive drive shaft shaft 180 180 (free (free end portion180b) end portion 180b). The . The axis axis L2 L2 of of the the coupling coupling 1215012150 inclines inclines to the position to the position(disengaging (disengaging angular angular position) position) wherewhere the the 30 30 upstream free upstream freeend endportion portion 150A2 150A2 reaches reaches to the to the drivedrive shaftshaft free-end 180b3(Figure free-end 180b3 (Figure69c) 69c). . And,And, in this in this state, state, the coupling the coupling 12150 is passed 12150 is passedwhile whileitit is is in in contact contact withwith the the drivedrive shaftshaft free-end free-end 180b3 180b3 (Figure (Figure 69d). Thereafter, 69d) Thereafter, the the cartridge cartridge B B isis

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completely retractedfrom completely retracted from thethe developing developing position position by the by the rotating operationofofthe rotating operation the rotary rotary C. C.

[0462]

[0462] As has As has been beendescribed described hereinbefore, hereinbefore, the the coupling 12150isismounted coupling 12150 mounted forfor inclining inclining motion motion relative relative to the to the 5 5 axis axis L1 L1 to to the the cartridge cartridge B. And,the B. And, thecoupling coupling12150 12150isis 2024200580

inclined withoutinterfering inclined without interfering with with thethe drive drive shaft shaft in response in response to to the the rotational rotational movement movement of of the the rotary rotary C. Bythis, C. By this,the the coupling 12150can coupling 12150 canbebedisengaged disengaged from from the the drive drive shaftshaft 180. 180.

[0463]

[0463] The coupling The coupling12150 12150can can be be integrally integrally handled handled 10 10 withthe with theend endmembers members(gear (gearand andSO soon) on)by bythe thestructure structureas as described above. described above. For Forthis thisreason, reason,the theassembly assemblyoperation operation property is property isimproved. improved.

[0464]

[0464] The structure The structurefor forinclining inclining thethe axis axis L2 the L2 of of the coupling tothe coupling to thepre-engagement pre-engagement angular angular position, position, immediately immediately 15 15 before the before thecoupling couplingengages engages with with the the drive drive shaft shaft may employ may employ any of the any of the embodiment embodiment2-embodiment 2-embodiment 5. 5.

Embodiment 11: Embodiment 11:

[0465]

[0465] Referring to Referring toFigure Figure70, 70, Figure Figure 71,71, and and Figure Figure 72, 72, embodiment 11will embodiment 11 willbebedescribed. described.

20 20 [0466]

[0466] The present The present embodiment embodiment is is different different from from Embodiment 10 Embodiment 10ininthe theposition position (position (position of the of the coupling) coupling) which which inputs the drive, inputs the drive,and andthe the structure structure which which transmits transmits the the rotational forcetotothe rotational force the developing developing roller roller and and the developer the developer supply rollerfrom supply roller fromthethe coupling. coupling.

25 25 [0467]

[0467] Figure 70 is Figure 70 isa aperspective perspective view view of of a cartridge a cartridge according according to to the the present present embodiment. Figure71 embodiment. Figure 71is isaa perspectiveview perspective viewillustrating illustrating a driving a driving portion portion of the of the

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cartridge. Figure72 cartridge. Figure 72(a) (a)is isaaperspective perspectiveview viewof ofaadriving driving input input gear, gear, as as seen seen from from the the driving driving side. Figure 72 side. Figure 72 (b) (b) is is aa perspectiveview perspective viewofofthe the driving driving input input gear, gear, as seen as seen from from the the non-driving side. non-driving side.

5 5 [0468]

[0468] The development The developmentgear gear145 145 andand thethe feed feed roller roller 2024200580

gear 146 gear 146 are aredisposed disposedatat thethe drive drive lateral lateral end end portions portions of the of the developing roller developing roller110 110 and and thethe feed feed roller roller 115 115 (Figure (Figure 1) , 1), respectively. Thegears respectively. The gears145 145and and146 146are arefixed fixedtotothe theshaft. shaft. The rotational The rotationalforce forcereceived received by by thethe coupling coupling 1315013150 from from the the 10 10 apparatus mainassembly apparatus main assembly A is A is transmitted transmitted through through the gear the gear to to the other rotating the other rotatingmembers members (the (the developing developing roller roller 110, 110, the the developer supply developer supplyroller roller 115, 115, thethe toner toner stirring stirring (unshown), (unshown), and and so on) of SO on) of cartridge cartridgeB B(B6) (B6). .

15 15 [0469]

[0469] A driving A driving input inputgear gear13147 13147 which which supports supports the the coupling 13150will coupling 13150 willbebe described. described.

[0470]

[0470] As shown As shown in inFigure Figure71, 71, the the gear gear 13147 13147 is is rotatably rotatably provided provided at at the the position position for engagementwith for engagement withthe the development gear development gear 145 145 and and the the feed feed roller roller gear gear 146. 146. The Thegear gear 20 20 13147 has the 13147 has thecoupling coupling containing containing section section 13147j 13147j similar similar to to the end member the end member12151 12151described described in in Embodiment Embodiment 10 (Figure 10 (Figure 72 72 (a)). (a) ) . The The coupling 13150 is coupling 13150 ispivotably pivotably retained retained by by a retaining a retaining member 13156 member 13156ononthe thegear gear 13147. 13147.

[0471]

[0471] Further, the Further, thesupporting supporting member member 13157 13157 and and the the 25 25 inclination regulationmember inclination regulation member 13157i 13157i are are mounted mounted to the to the cartridge cartridge BB(Figure (Figure70). 70).

[0472]

[0472] The supporting The supportingmember member 13157 13157 is is provided provided withwith the the hole and hole and the theinner innersurface surface 13157i 13157i thereof thereof engages engages with with the the gear 13147. gear 13147. Since Sincethe theengagement, engagement,drive, drive,and anddisengagement disengagementof of

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the couplingbybythe the coupling therotating rotating operation operation of the of the rotary rotary are the are the same as that same as thatofofEmbodiment Embodiment10,10, thethe description description is omitted is omitted for for simplicity. simplicity.

[0473]

[0473] In addition,The In addition, Thestructure structureforfor inclining inclining the the 5 5 axis L2 of axis L2 of the thecoupling couplingto to thethe pre-engagement pre-engagement angular angular 2024200580

position, immediately position, immediately before before thethe coupling coupling engages engages with with the the drive shaft drive shaftmay mayemploy employ any any of of that that of the of the embodiment embodiment 2 - 2- embodiment 5. embodiment 5.

[0474]

[0474] As has As has been beendescribed described hereinbefore, hereinbefore, it not it is is not 10 10 necessary to necessary todispose disposethe the coupling coupling at the at the end end co-axial co-axial with with the the developing developing roller. Accordingto roller. According tothis thisembodiment, embodiment,thethelatitude latitude in the design in the designofofthe theimage image forming forming device device bodybody and the and the cartridge cartridge can can be be improved. According to improved. According to this thisembodiment, embodiment,the the effects similar effects similartotoEmbodiment Embodiment 9 are 9 are provided. provided.

15 15 Embodiment 12: Embodiment 12:

[0475]

[0475] Embodiment12 Embodiment 12will willbebe described described with with reference reference to to Figures 73 Figures 73 and and74. 74.

[0476]

[0476] In the above-described In the above-described Embodiments, Embodiments, the the casecase of of using the using the rotation rotationselecting selecting mechanism mechanism (rotary) (rotary) as moving as the the moving memberfor 20 member 20 forthe thedeveloping developingdevice device(cartridge (cartridgeB)B)isisdescribed. described. In this embodiment, In this embodiment,another another moving moving member member willwill be described. be described.

[0477]

[0477] Figures 73(a) Figures 73 and 73 (a) and 73(b) are sectional (b) are sectionalviews views showing showing aa cartridge cartridgesupporting supporting member member for for supporting supporting four four cartridges cartridges BB(14B1 (14B1toto14B4) 14B4). Figures . Figures 74(a) 74 (a) to to 74(e) 74 (e) areare perspectiveviews 25 perspective 25 viewsand andside sideviews viewsshowing showingprocesses processesforfor engaging anddisengaging engaging and disengaging a coupling a coupling withwith respect respect to a to a driving driving shaft. shaft.

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[0478]

[0478] Referring toFigures Referring to Figures7373(a) and7373(b), (a) and (b) thethe respective cartridgesB B respective cartridges (14B1 (14B1 to to 14B4) 14B4) are are laterally laterally arranged arranged in cross section in cross sectioninina acartridge cartridge supporting supporting member member 1419014190 and and are detachablymounted are detachably mounted to to thethe cartridge cartridge supporting supporting member member 5 5 14190. Figure 14190. Figure 73 73(a) (a) isis a schematic a schematic viewview showing showing a state a state in in which aa first which firstcolor colorcartridge cartridge 14B1 14B1 is located is located at a at a portion portion 2024200580

opposite toa aphotosensitive opposite to photosensitive drum drum 107 107 and and is capable is capable of of performing development performing development with with respect respect to to the the photosensitive photosensitive drum drum 107. When the 107. When the cartridge cartridge 14B1 14B1 completes completes the the development, development, the the 10 10 supporting member14190 supporting member 14190 moves moves in in an an X20 X20 direction, direction, so that SO that an an adjacent (second)color adjacent (second) color cartridge cartridge 14B2 14B2 is located is located at the at the opposing portion(developing opposing portion (developing position) position) withwith respect respect to the to the photosensitive drum photosensitive drum 107. 107. Incidentally, Incidentally,aadeveloper developerimage image formed on the formed on thephotosensitive photosensitive drum drum 107107 is transferred is transferred onto onto a a 15 15 transfer transfer belt belt 104a. Theseoperations 104a. These operationsare arerepeated repeatedfor foreach eachofof the colors.Finally, the colors. Finally, as as shown shown in Figure in Figure 73(b), 73 (b), a fourth a fourth color color cartridge 14B4isismoved cartridge 14B4 moved to to thethe opposing opposing portion portion with with respect respect to the photosensitive to the photosensitivedrum drum 107, 107, SO so that that fourfour color color developer developer images images are are transferred transferred onto onto the the transfer transfer belt. Then,the belt. Then, the 20 20 developer imagesare developer images aretransferred transferred from from the the transfer transfer belt belt onto a onto a recording materialS Sand recording material and areare fixed fixed on the on the recording recording material material S. S.

[0479]

[0479] Incidentally, Incidentally, eacheachofofthe the cartridges cartridges 14 moved 14 is is moved in in aa direction directionsubstantially substantially perpendicular perpendicular to ato a direction direction of of 25 25 the axial line the axial lineL3L3ofofthe the driving driving shaft shaft 180 180 by movement by the the movement of of the supportingmember the supporting member14190 14190 in in oneone direction. direction.

[0480]

[0480] As aa result, As result,a acolor colorimage image is is formed formed on the on the recording materialS.S. recording material

[0481]

[0481] When aa series When seriesofofthe thecolor color image image formation formation is is 30 30 completed, thesupporting completed, the supporting member member 14190 14190 is moved is moved in X21 in the the X21

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direction tobebereturned direction to returnedto to an an initial initial position position (the (the statestate of of Figure Figure 7373(a)). (a) .

[0482]

[0482] Next, with Next, withreference referencetoto Figures Figures 74 74(a) (a) to to 74 74(e), (e), steps of connecting steps of connectingand and disconnecting disconnecting the the coupling coupling with with respecttotothe 5 respect 5 thedriving drivingshaft shaftbybythe themovement movementofofthe thesupporting supporting 2024200580

member will member will be be described. described. Representatively, Representatively,connection connectionand and disconnectionofofthe disconnection thecartridge cartridge 14B3 14B3 withwith respect respect to a to a coupling coupling 14150C will be 14150C will bedescribed. described. Figure Figure 74(a) 74 (a) is aisperspective a perspective view view showing showing aa state stateofofthe the coupling coupling 14150C 14150C immediately immediately before before 10 10 connection to connection tothe thedriving driving shaft shaft 180180 and and Figure Figure 74(b) 74 (b) is ais a side side view thereof. view thereof.Figure Figure 74(c) 74 (c) is is a perspective a perspective view view showing showing a a state in state in which whichthe thecoupling coupling is is connected connected to driving to the the driving shaft shaft and placed and placed in a in a driving driving force force transmittable transmittable condition. condition. Figure Figure 74(d) 74 (d) is is aa perspective viewshowing perspective view showing a disconnected a disconnected state state of of 15 thecoupling 15 the coupling from from the the driving driving shaftshaft and Figure and Figure 74 (e)74(e) is a is a side side view thereof. view thereof.

[0483]

[0483] In this embodiment, In this embodiment,asas a means a means forfor including including the the axial line L2, axial line L2,the theconstitution constitution described described in Embodiment in Embodiment 5 is 5 is used. That used. Thatis, is,aaregulation regulationribrib14191 14191provided providedto tothe the 20 20 apparatus main apparatus mainassembly assemblyis is disposed disposed along along a lower a lower side side of a of a line L20 through line L20 throughwhich which a coupling a coupling 14150C 14150C passes passes and upstream and upstream from the driving from the drivingshaft shaft 180 180 with with respect respect to atomovement a movement direction X20. direction X20. Further, Further,similarly similarlyasasin inEmbodiment Embodiment6,6,aa distance between distance betweena atop top surface surface 14191a 14191a of the of the regulation regulation rib rib 25 25 and the coupling and the coupling14150C 14150C is is setset to to be smaller be smaller when when the coupling the coupling 14150C 14150C comes comes closer closer to to the the driving driving shaft shaft 180. Further, as 180. Further, as shown in Figure shown in Figure7474(b), an inclination (b) , an inclinationdirection directionof of an an axial axial line line LL is is regulated regulatedSOso that that a driven a driven portion portion (portion (portion to beto be driven) 14150Caisisdirected driven) 14150Ca directed upwardly upwardly withwith respect respect to line to the the line 30 30 L20 (the L20 (the inclination inclination direction direction is is indicated indicated by by a a line line L30) L30). .

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[0484]

[0484] Here, when development Here, when development with with thethe cartridge cartridge 14B214B2 is completed,the is completed, thesupporting supporting member member is horizontally is horizontally movedmoved in in one one direction. Bythis direction. By thismovement, movement,the thecartridge cartridge14B3 14B3is ismoved moved toward toward a a predetermined predetermined position. Duringits position. During itsprocess, process,an an 5 5 intermediate portion14150Cc intermediate portion 14150Cc contacts contacts the the top top surface surface 14191a. 14191a. At this At this time, time, as as described described inin Embodiment Embodiment 6, 6, the the driven driven portion portion 2024200580

14150Ca is directed 14150Ca is directedtoward toward thethe driving driving shaft shaft 180 180 (the (the pre-engagementangular pre-engagement angular position) position) (the (the state state of Figure of Figure 74(a)). 74 (a) ) . Thereafter, similarlyasas Thereafter, similarly in in thethe above-mentioned above-mentioned description, description, 10 10 the coupling14150C the coupling 14150Cengages engages with with thethe driving driving shaft shaft 180 (the 180 (the rotating forcetransmitting rotating force transmitting angular angular position) position) (the (the statestate of of Figure 74(c)). Figure 74 (c) ) . Then, Then, when image formation when image formationwith with thethe cartridge cartridge 14B3 is completed, 14B3 is completed,thethe cartridge cartridge 14B3 14B3 is moved is moved in X20 in the the X20 direction. The direction. Thecoupling coupling14150C 14150Cisisdisengaged disengagedfrom fromthethedriving driving 15 15 shaft 180 (disengagement shaft 180 (disengagement angular angular position) position) (the(the statestate of of Figure 74(d)). Figure 74 (d) ) . Details are the Details are the same sameasasthose those described described above, above, thus being omitted. thus being omitted.

[0485]

[0485] As described As describedabove, above,the the developments developments withwith all all the couplingsare the couplings arecompleted, completed,thethe supporting supporting member member 1419014190 is is 20 returned 20 returned to to thethe initial initial position position (the (the statestate of Figure of Figure 74 (b) 74(b)). ) . An operation An operation during during a a process process thereof thereof will will be be described. described. The The coupling of each coupling of eachofofthe the cartridges cartridges is required is required to pass to pass through through the the driving driving shaft shaft 180. Forthis 180. For thisreason, reason,the thecoupling couplingis, is, similarly asduring similarly as duringthe the development, development, moved moved fromfrom the the 25 25 pre-engagement angular pre-engagement angular position position to to the the disengagement disengagement angular angular position through position throughthe therotating rotating force force transmitting transmitting angular angular position. For position. Forthis thispurpose, purpose,ititis isnecessary necessaryto toemploy employaa constitution constitution for for inclining inclining the the axial axial line line L2. As shown L2. As shown in in Figure 74(d), Figure 74 (d) , aa regulation rib 14192 regulation rib 14192similar similarto to that that descried descried 30 30 in Embodiment6 6isisdisposed in Embodiment disposed along along thethe upper upper sideside of line of the the line L20 L20 through through which which the the coupling coupling 14150C 14150C passes. passes. TheTherib rib14192 14192 is disposed upstream is disposed upstreamfrom from thethe driving driving shaft shaft 180 180 with with respect respect to to the the movement movement direction direction X21. Further, the X21. Further, the distance distance between between

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the regulationrib the regulation rib14192 14192 andand thethe line line L20 L20 is similarly is set set similarly as as in in the the case case of of the the regulation regulation rib rib 14192. That is, 14192. That is, the the regulation rib14191 regulation rib 14191and and thethe regulation regulation rib rib 14192 14192 are in are set set a in a point-symmetry relationship point-symmetry relationship with with respect respect to to the the center center of of the the 5 5 driving shaft180. driving shaft 180.Incidentally, Incidentally, as shown as shown in Figure in Figure 74(e), 74 (e), a a regulation directionofof regulation direction the the coupling coupling 14150C 14150C is changed. is not not changed. 2024200580

For this reason, For this reason,the thecoupling coupling 14150C 14150C is also is also moved, moved, at the at the initial stage(X21 initial stage (X21direction), direction), from from the the pre-engagement pre-engagement angular angular position to position tothe thedisengagement disengagement angular angular position position through through the the 10 10 rotatingforce rotating forcetransmitting transmittingangular angularposition positionbybythe thesame same operation asduring operation as duringthe the image image formation formation (development) (development) (during (during the the movement movement in in the the X20 X20 direction). Duringthis direction). During thisoperation, operation, the the coupling14150C coupling 14150Cpasses passes through through the the driving driving shaftshaft 180 and 180 and then is returned then is returnedtotothe the initial initial position. position.

15 15 [0486]

[0486] In this embodiment, In this embodiment,the the cartridge cartridge is detachably is detachably supported supported with with respect respect toto the the image image forming forming apparatus. During apparatus. During replacement ofthe replacement of thecartridge, cartridge,as as shown shown in Figure in Figure 74(a), 74 (a), the the supporting member14190 supporting member 14190 is is rotationally rotationally moved moved in X30 in the the X30 direction. By direction. Bythis thisrotational rotationalmovement, movement,the theuser usermoves moveseach each 20 20 of the cartridges of the cartridges14B1 14B1 to to 14B4 14B4 to to a replaceable a replaceable position. position.

[0487]

[0487] Incidentally, Incidentally, ininthis thisembodiment, embodiment, thethe movement movement direction of direction ofthe thedeveloping developing cartridge cartridge is obliquely is obliquely upward upward but but may also may also be beananopposite opposite direction direction and and the the developing developing cartridge cartridge may be may be disposed disposedSOsoasas to to be be movable movable in other in other directions. directions.

25 25 [0488]

[0488] In the foregoing In the foregoingdescription, description, thethe image image formation (development) formation (development) is is effected effected whenwhen the the cartridge cartridge is is moved in moved in one onedirection directionbutbut is is notnot effected effected whenwhen the cartridge the cartridge is is moved moved other other directions. However, the directions. However, the present present invention invention is is not limited not limited thereto. thereto. For Forexample, example,when whenthe thecartridge cartridgeisismoved moved 30 30 in other directions, in other directions,the the image image formation formation may may be effected. be effected.

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[Embodiment 13]

[0489]

[0489] Embodiment 13 Embodiment 13will willbebe described described with with reference reference to to Figure 75. Figure 75.

[0490]

[0490] In the foregoing In the foregoingdescription, description, thethe cartridge cartridge 2024200580

5 5 detachably mountable detachably mountablethethe apparatus apparatus mainmain assembly assembly A is A is described. In described. Inthis thisembodiment, embodiment,such suchan animage imageforming forming apparatus that apparatus thatthe thedeveloping developing device device as the as the developing developing apparatus is apparatus isfixed fixedtoto anan apparatus apparatus mainmain assembly assembly and image and image formation iseffected formation is effectedbyby real real time time supply supply of developer. of the the developer. 10 10 That is, That is, the thedeveloping developing device device in in this this embodiment embodiment is mounted is mounted to the apparatus to the apparatusmain mainassembly assembly A by A by the the useruser butnot but is is not demounted. The demounted. Thedeveloping developingdevice deviceininthis thisembodiment embodimentis isaa fixed-type inwhich fixed-type in whichthe the developing developing device device is fixed is fixed to the to the apparatus mainassembly apparatus main assembly A and A and is is used used in ainfixed a fixed state. state. 15 15 Maintenanceisisperformed Maintenance performed by by a service a service person. person.

[0491]

[0491] Figure 75 is Figure 75 isa asectional sectional view view of of thethe apparatus apparatus main assembly. main assembly.

[0492]

[0492] As shown As shown in inFigure Figure75, 75, a rotary a rotary C2 C2 includes includes four four color developingdevices color developing devices 15A, 15A, 15B, 15B, 15C 15C and and 15D 15D mounted mounted 20 20 therein. Therotary therein. The rotaryC2 C2further furtherincludes includesdeveloper developerbottles bottles 16A, 16B, 16C 16A, 16B, 16Cand and16D 16Deach eachforfor supplying supplying a developer a developer to anto an associated associated developing developing device. These bottles device. These bottles 16A, 16A, 16B, 16B, 16C 16C and and 16D are detachably 16D are detachablymounted mounted to to thethe apparatus apparatus mainmain assembly assembly A in A in a a direction direction perpendicular perpendicular toto the the drawing. Whenthe drawing. When thedeveloper developer 25 25 in the bottle in the bottleempties, empties,the the bottle bottle is is replaced replaced by user. by the the user.

[0493]

[0493] By the By the rotation rotationofofthe the rotary rotary C, C, each each of the of the developing devices developing devices15A, 15A, 15B, 15B, 15C15C andand 15D 15D is successively is successively moved moved to to aa portion portion(developing (developing position) position) opposite opposite to the to the photosensitivedrum photosensitive drum107 107 andand at at thethe opposing opposing portion, portion, a latent a latent

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image formedononthe image formed thephotosensitive photosensitive drum drum 107 107 is developed. is developed. Depending onthe Depending on themovement movement of of each each of the of the developing developing devices devices to to the opposingportion, the opposing portion,the the coupling coupling member member (not(not shown) shown) provided provided to the developing to the developingdevice deviceis is engaged engaged withwith the the driving driving shaftshaft 5 5 provided to provided tothe theapparatus apparatus main main assembly assembly (not(not shown). shown) Thereafter,when Thereafter, whenthe theimage image formation formation is completed, is completed, the the 2024200580

cartridge (notshown) cartridge (not shown)isis disengaged disengaged fromfrom the the driving driving shaft. shaft. This operation This operationisissimilar similar to to that that in Embodiment in Embodiment 1 and1 the and the like, so that like, SO thatdescription description thereof thereof is omitted. is omitted.

10 10 [0494]

[0494] As described As describedabove, above,even even in in thethe case case of drive of drive switching ofthe switching of thedeveloping developing device device fixed fixed to the to the apparatus apparatus main main assembly, theoperation assembly, the operation can can be be performed performed similarly similarly as inasthe in the cases of Embodiments cases of Embodimentsdescribed described above. above.

Embodiment14: Embodiment 14:

15 15 [0495]

[0495] Referring to Referring toFigure Figure76, 76, Figure Figure 77,77, and and Figure Figure 78, ,78,, embodiment 14 embodiment 14will willbebe described. described.

[0496]

[0496] These embodiments These embodimentsdiffer differ from from Embodiment Embodiment 11 in 11 in the configurationofofthe the configuration the coupling, coupling, and and provision provision of the of the elastic material elastic materialfor formaintaining maintaining thethe coupling coupling at pre- at the the pre- 20 20 engagement angularposition. engagement angular position.

[0497]

[0497] Figure 76 (a) Figure 76 (a)isisa aperspective perspective view view illustrating illustrating a a part part of of cartridge cartridge B. Figure76 B. Figure 76(b) (b)and andFigure Figure76 76(a) (a)are are sectional viewstaken sectional views takenalong along a line a line extended extended in inclining in the the inclining direction of direction ofthe theaxis axis ofof thethe coupling coupling through through the center the center of of 25 25 the drivinginput the driving inputgear gear (the (the member member which which mounts mounts the driving the driving input input gear gear is is also also illustrated). Figure 77 illustrated). Figure 77 (a) (a) is is aa side side view view of of the the coupling coupling alone. Figure77 alone. Figure 77(b) (b)is isaaperspective perspectiveview viewof of the the coupling coupling alone. Figure78 alone. Figure 78(a) (a)is isaasectional sectionalview view illustrating thestate illustrating the state where where thethe coupling coupling (cartridge) (cartridge) is is

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positioned at positioned at the the pre-engagement pre-engagement angular angular position. position. Figure Figure78 78 (b) (b) is is aa sectional sectionalview viewillustrating illustrating thethe state state where where the the coupling (cartridge)isis coupling (cartridge) positioned positioned at the at the rotational rotational forceforce transmitting transmitting angular angular position. Figure78 position. Figure 78(c) (c)is isaasectional sectional 5 5 view illustrating view illustratingthe the state state where where the the coupling coupling (cartridge) (cartridge) is is positioned at positioned at the the disengaging disengaging angular angular position. position. Figure Figure7878 2024200580

(a), (a), (b), and (c) (b) and (c) illustrate illustrate the the positional positional relations relations between between the coupling15150 the coupling 15150and and the the drive drive shaft shaft 180.180.

[0498]

[0498] As shown As shown in inFigure Figure76, 76, the the development development geargear 145 145 10 10 is is disposed disposed to to the the end end of of the the developing developing roller roller 110. And, the 110. And, the gear 145 gear 145 is isfixed fixedtotothe the shaft shaft 155155 of the of the developing developing roller roller 110. 110.

[0499]

[0499] A driving A driving input inputgear gear15147 15147 which which mounts mounts the the coupling 15150will coupling 15150 willbebe described. described.

15 15 [0500]

[0500] As shown As shown in inFigure Figure76, 76, the the gear gear 15147 15147 has has the the gear portion gear portionfor formeshing meshing engagement engagement withwith the the development development gear gear 145 15147a, and 145 15147a, andthe thegear gear portion portion 15147b 15147b for for meshing meshing engagement engagement with the with the feed feedroller rollergear gear146146 (Figure (Figure 58) 58). . And, And, the gear the gear 15147 is rotatably 15147 is rotatablymounted mounted to to thethe cartridge cartridge B byBa by a supporting supporting 20 20 member 15170 member 15170 and and aa supporting supporting member member 15157. 15157. The Thesupporting supporting member 15170 member 15170functions functions also also as as thethe bearing bearing member member for the for the developing roller developing roller110. 110.

[0501]

[0501] By this, By this, the therotational rotational force force received received by the by the coupling 15150from coupling 15150 fromthe the apparatus apparatus main main assembly assembly A is A is 25 25 transmitted tothe transmitted to thedeveloping developing roller roller 110 110 through through the 15155 the pin pin 15155 (rotational forcetransmitting (rotational force transmitting portion), portion), the the rotational rotational forceforce transmitting surface12151h transmitting surface 12151h (Figure (Figure 62 (a), 62 (a) , (b)(b), rotational , rotational force receivingportion), force receiving portion),thethe gear gear 147, 147, and and geargear 145. 145.

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[0502]

[0502] The coupling15150 The coupling 15150isispivotably pivotably mounted mounted to the to the gear 15147 by gear 15147 bya aretaining retaining portion portion 15147m 15147m (movable (movable amongamong said said three angularpositions) three angular positions).. In In addition, addition, the the coupling coupling 1515015150 is is urged by an urged by anurging urgingspring spring (elastic (elastic material) material) 15159 15159 in order in order to to 5 5 maintain the maintain the pre-engagement pre-engagement angular angular position. position. InInthis this embodiment, embodiment, the the spring spring 15159 15159 isis aa torsion torsion coil coil spring. spring. AA 2024200580

supporting portion15159a supporting portion 15159aof of thethe spring spring 15159 15159 is locked is locked by a by a mounting portion mounting portion (unshown) (unshown) provided provided on on the the cartridge cartridge B. B. And, And, an arm portion an arm portion15159b 15159bthereof thereof elastically elastically urges urges an an 10 10 intermediate intermediate part part 15150c 15150c of of the the coupling. coupling. ByBythis, this,the theaxis axis L2 of the L2 of the coupling coupling15150 15150 is is maintained maintained at the at the pre-engagement pre-engagement angular position(Figure angular position (Figure 78 78 (a)(a)). ) . In In thethe present present embodiment, embodiment, a spring force a spring force(elastic (elastic force) force) of of the the spring spring 1515915159 is 5gis- 5g - 100g. 100g. IfIf it it is is below below 5g, 5g, the the coupling coupling may may not not incline incline 15 15 correctlydue correctly duetotothe thefrictional frictionalforce forceand andSO soon. on.If If it it is is more than more than 100g, 100g,the thecontact contact portion portion of the of the spring spring may be may be shaved shaved at at the the time time of of the the rotation rotation ofof the the coupling. However, coupling. However, the spring force the spring forceother other than than this this range range may may be employed be employed depending onthe depending on theconditions, conditions, such such as the as the wirewire diameter diameter and the and the 20 materialof 20 material ofspring, spring,and andconfiguration configurationand andmaterial materialof ofthe the coupling. coupling. InIn addition, addition, it it is is not not limited limited to to the the torsion torsion coil coil spring. spring.

[0503]

[0503] More particularly, More particularly, thethe spring spring 15159 15159 (elastic (elastic material) elastically material) elastically urges urges the the coupling coupling 15150. 15150. The Theelastic elastic 25 25 force thereofisissuch force thereof suchthat that it it cancan maintain maintain the the coupling coupling 1515015150 at the pre-engagement at the pre-engagementangular angular position, position, while while it permits it permits moving the moving the coupling coupling from from the the pre-engagement pre-engagement angular angular position position to the rotational to the rotationalforce force transmitting transmitting angular angular position position (Figure (Figure 78 (b)), 78 (b) andititpermits , and permits moving moving thethe coupling coupling 15150 15150 from from the the 30 30 rotational forcetransmitting rotational force transmitting angular angular position position to the to the disengagingangular disengaging angularposition position (Figure (Figure 78 (c)). 78 (c) )

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[0504]

[0504] This appliesalso This applies alsototothe the spring spring (elastic (elastic material) 4159 material) 4159described describedby by thethe embodiment embodiment of embodiment of the the embodiment 3 3 and so on. and SO on.

[0505]

[0505] Further, thecartridge Further, the cartridge B has B has thethe inclination inclination 5 5 regulating portionfor regulating portion for regulating regulating thethe inclining inclining direction direction of of 2024200580

the the coupling. Sincethis coupling. Since thisstructure structureisisthe thesame sameas asthat thatof of Embodiment11, Embodiment 11,the thedescription description is is omitted omitted for for simplicity. simplicity.

[0506]

[0506] As shown As shown in inFigure Figure77, 77, thethe couplings couplings 15150 15150 differ from differ fromthe thecoupling coupling 12150 12150 described described in Embodiment in Embodiment 10 in10 in 10 10 the configurationofofthe the configuration the driven driven portion portion 15150a. 15150a.

[0507]

[0507] More particularly, More particularly, an an opening opening 15150m 15150m of of the the driven portion driven portion 15150a 15150a is is provided provided with with the the recess recess 15150z 15150z and and the the flat flat portion portion 15150y. Therecess 15150y. The recess15150z 15150zisiscontacted contactedtoto the free end the free endportion portion180b 180b of of thethe drive drive shaft shaft 180 (Figure 180 (Figure 78 78 15 15 (b)). (b) ) . As As shown in Figure shown in Figure 78, 78,when whenthe the coupling coupling 15150 15150 reaches reaches the rotationalforce the rotational forcetransmitting transmitting angular angular position position (Figure (Figure 78 78 (b)) through the (b) through the pre-engagement pre-engagement angular angular position position (Figure (Figure 78 78 (a)), (a) ), the the rotational force of rotational force ofthe thedrive drive shaft shaft 180180 willwill be be transmitted tothe transmitted to thecoupling coupling 15150 15150 through through the the pin 182. In pin 182. In 20 20 this embodiment,not this embodiment, notthe the recess recess 15150z 15150z but but the the drivedrive shaftshaft 180 180 side side is is the the flat flat portion portion 15150y. 15150y. ByBythis, this,the theperipheral peripheralpart part 182d 182d (Figure (Figure 78 78 (a), (b), (c) (a) (b), (c)) and and thethe flat flat portion portion 15150y 15150y ofof the couplingofofthe the coupling thepin pin 182 182 cancan be be brought brought close close to each to each other other (Figure 78(b) (Figure 78 (b)). ) .

25 25 [0508]

[0508] By this, By this, the thelengths lengthsofof thethe cartridge cartridge B and B and the the apparatus mainassembly apparatus main assemblyin in thethe direction direction of the of the axis axis L1, L3 L1, L3 can can be be shortened. Therefore,the shortened. Therefore, thecartridge cartridgeBBand andthe the apparatus mainassembly apparatus main assembly can can be be downsized. downsized.

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[0509]

[0509] Here, an Here, an inner innerdiameter diameter Z1=phi Z1=phi of of the the flatflat portion 15150y portion 15150yofofthe the coupling coupling used used by this by this implementation implementation is is about about 5mm. Inaddition, 5mm. In addition,an anouter outerdiameter diameterz2=phi Z2=phithereof thereofis is approx. approx. 11mm. Inaddition, 11mm. In addition,aadepth depthZ3= Z3=of ofthe theflat flatportion portionisis 5 5 approx. approx. 0.6mm. 0.6mm. InInaddition, addition,aadepth depthofofthe therecess recess15150z 15150zof of conical shapeisisapprox. conical shape approx. 1.5mm 1.5mm in in thethe top top partpart of conical of conical 2024200580

shape, shape, and and the the diameter diameter thereof thereof isis approx. approx. 5mm. Inaddition, 5mm. In addition, a a weight weight of of the the coupling coupling 15150 15150 isis approx. approx. 1.5g. Inthis 1.5g. In this embodiment, thematerial embodiment, the material of of thethe coupling coupling is polyacetal. is polyacetal. 10 10 However, thevalues However, the valuesofof thethe size size andand weight weight are are not inevitable, not inevitable, and the person and the personskilled skilledin in thethe artart can can select select them them properly. properly.

[0510]

[0510] In addition,ininthe In addition, thepresent present embodiment, embodiment, the the projection 15150d projection 15150d(15150d1, (15150d1, d2)d2) of of the the coupling coupling is disposed is disposed at at each each of of two two places. places. By Bythis, this,the thewidth widthmeasured measuredalong alongthethe 15 15 circumference circumference ofofthe theentrance entrance portion portion 150k150k (150k1, (150k1, k2) be k2) can can be enlarged. Therefore, enlarged. Therefore,the theentrance entranceof ofthe thepin pin182 182to tothe the entrance portion entrance portion 150k 150k can can be be smoothed. smoothed. Although Althoughthe thenumber numberof of the projectionscan the projections canbebe selected selected properly, properly, a plurality a plurality of of projections are projections are desirable. desirable. This Thisisisbecause becausethe therotational rotational 20 20 force can be force can betransmitted transmitted with with high high precision. precision.

[0511]

[0511] Since the configuration Since the configurationof of thethe coupling coupling other other than these and than these andengagement, engagement, drive, drive, andand disengagement disengagement of the of the coupling by the coupling by therotating rotating operation operation of the of the rotary rotary are same are the the same as that of as that of those thoseofofEmbodiment Embodiment 10,10, the the description description is omitted is omitted 25 25 for simplicity. for simplicity.

[0512]

[0512] In addition,the In addition, thestructure structureforfor inclining inclining the the axis of the axis of thecoupling couplingtoto the the pre-engagement pre-engagement angular angular position position may employ may employany anyofofthe the embodiment embodiment 2-embodiment 2-embodiment 5. 5.

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[0513]

[0513] In addition,ininthis In addition, thisembodiment, embodiment, thethe coupling coupling 15150 is provided 15150 is providedatatthe the position position remote remote fromfrom the axis the axis L1 inL1 in the directionperpendicular the direction perpendicular to to thethe axisaxis L1 (Figure L1 (Figure 76 )(b)). 76 (b) .

[0514]

[0514] In this embodiment, In this embodiment,thethe coupling coupling is is disposed disposed at at 5 5 such such aa position. For this position. For this reason, reason, the the latitude latitude in in the the design design 2024200580

of the apparatus of the apparatusmain mainassembly assembly andand the the cartridge cartridge can be can be improved. Whenthe improved. When thecoupling couplingis isdisposed disposedco-axially co-axiallywith withthe the axis L1, the axis L1, theposition positionofof thethe coupling coupling willwill approach approach the the photosensitive drum. photosensitive drum. ForForthis thisreason, reason,ititis isa aconstraint constraintto to 10 10 the dispositionofofthe the disposition the coupling, coupling, butbut in the in the present present embodiment, theconstraint embodiment, the constraint from from thethe photosensitive photosensitive drum drum is is mitigable. mitigable.

[0515]

[0515] As has As has been beendescribed described hereinbefore, hereinbefore, in this in this embodiment, thecoupling embodiment, the coupling 15150 15150 hashas a circular a circular flat flat portion portion 15 15 15150y 15150y in in the the free free end end side. side. AA recess recess 15150z 15150z is is provided provided in in the center OOofofthe the center theflat flat portion portion 15150y 15150y (circular). (circular) . The The recess 15150zhas recess 15150z hasa aconical conical shape shape which which expands expands toward toward the the free free end end side side thereof. In addition, thereof. In addition, projections projections (rotational (rotational force receivingportions) force receiving portions) 15150d 15150d areare disposed disposed at edge at the the edge of of 20 20 the circularflat the circular flatportion portion 15150y 15150y in in the the position position diametrically diametrically opposed opposed interposing interposing the the center center OO (two (two positions). These positions) These projectionsproject projections projectinin the the direction direction of the of the rotation rotation axis axis L2 L2 of of the the coupling. coupling. InInaddition, addition,the thepins pins(rotational (rotationalforce force applying portions)182 applying portions) 182 project project in in the the directions directions perpendicular perpendicular 25 25 to the axis to the axisL3. L3.( )(て) ) totoprovide provide thethe projections projections at two at the the two places opposed places opposed to to each each other, other, respectively. respectively. Any Anyone oneofofthe the rotational forcereceiving rotational force receiving surfaces surfaces (rotational (rotational forceforce receiving portions)15150e receiving portions) 15150e engages engages with with one one of pin of the the pin projections 182. projections 182. And, And,the theother otherone oneof ofthe therotational rotationalforce force 30 30 receiving surfaces15150e receiving surfaces 15150e engages engages with with the the other other onethe one of of the pin projections pin projections 182. 182. ByBythis, this,from fromthe thedrive driveshaft shaft180, 180,the the coupling 15150receives coupling 15150 receives the the rotational rotational force force and rotates. and rotates.

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[0516]

[0516] Here, accordingtotothe Here, according the embodiments embodiments described described above, in the above, in thestructure structureof of moving moving the the cartridge cartridge B (developing B (developing roller 110) in roller 110) inthe thedirection direction substantially substantially perpendicular perpendicular to to the directionofofthe the direction theaxis axis L3 L3 of of thethe drive drive shaft shaft 180 in 180 in 5 responsetotoininthe 5 response themovement movementtotothe theone onedirection directionofofthe therotary rotary C (supporting C (supportingmember member14190), 14190),thethe coupling coupling 150 150 (1350, (1350, 3150,3150, 2024200580

4150, 5150, 7150, 4150, 5150, 7150,8150, 8150, 9150, 9150, 10150, 10150, 12150, 12150, 13150, 13150, 1515015150 and and so on) can SO on) can accomplish accomplishthe the coupling, coupling, the the engagement, engagement, and the and the disengaging operation disengaging operation relative relative to to the the drive drive shaft shaft 180. 180. This This 10 10 is is accomplished accomplished because this coupling because this coupling can can take take the the next next positions as positions asdescribed described above: above: 1. The rotational 1. The rotational force force transmitting transmitting angular angularposition positionfor for transmitting therotational transmitting the rotational force force from from the the apparatus apparatus main main assembly assembly AA to tothe thedeveloping developing roller roller 110;110; 15 15 2. thispre-engagement 2. this pre-engagementangular angularposition positioninclined inclinedfrom from this rotationalforce this rotational forcetransmitting transmitting angular angular position position before before this couplingengages this coupling engageswith with thethe rotational rotational force force applying applying portion; and portion; and 3. The disengaging 3. The disengaging angular angular position position inclined inclined toward toward the the 20 20 opposite sidefrom opposite side fromthe the pre-engagement pre-engagement angular angular position position from from the rotationalforce the rotational forcetransmitting transmitting angular angular position position for the for the coupling to disengage coupling to disengagefrom from drive drive shaft. shaft.

[0517]

[0517] Here, the rotational Here, the rotationalforce force transmitting transmitting angular angular position is position isthe theangular angular position position of the of the coupling coupling for for 25 25 transmitting therotational transmitting the rotational force force forfor rotating rotating the developing the developing roller 110 to roller 110 tothe thedeveloping developing roller roller 110.110.

[0518]

[0518] In addition,the In addition, thepre-engagement pre-engagement angular angular position position is the angular is the angularposition position which which is is inclined inclined fromfrom the rotational the rotational force transmittingangular force transmitting angular position position and and which which is taken is taken before before 30 30 the drum coupling the drum couplingmember member engages engages with with the the rotational rotational forceforce applying portion. applying portion.

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[0519]

[0519] In addition,the In addition, thedisengaging disengaging angular angular position position is is the angularposition the angular positionwhich which is is inclined inclined toward toward the opposite the opposite side from the side from thepre-engagement pre-engagement angular angular position position from from the the rotational forcetransmitting rotational force transmitting angular angular position position and which and which 5 5 permits the permits thedisengagement disengagementof of thethe coupling coupling fromfrom the drive the drive shaft shaft 180. 180. 2024200580

[0520]

[0520] Here, the meaning Here, the meaning"perpendicular "perpendicular substantially" substantially" will be will be described. described. Here, Here,the thedescription descriptionwill willbebemade madeabout about "perpendicular "perpendicular substantially". Between the substantially". Between the cartridge cartridge bb and and 10 10 the apparatusmain the apparatus mainassembly assembly A and A and in order in order to mount to mount and and demount thecartridge demount the cartridgeB B smoothly, smoothly, small small gapsgaps are provided. are provided. More specifically More specificallyand and the the small small gaps gaps are are provided provided between between the the guide 140R1and guide 140R1 andthe theguide guide 130R1 130R1 with with respect respect to the to the longitudinal direction, longitudinal direction, between between thethe guide guide 140R2 140R2 and guide and the the guide 15 15 130R2 with respect 130R2 with respecttotothe the longitudinal longitudinal direction, direction, between between the the guide 140L1and guide 140L1 andthe theguide guide 130L1 130L1 with with respect respect to the to the longitudinal longitudinal direction between direction between , and , and thethe guide guide 140L2 140L2 andand the guide 130L2 the guide 130L2with withrespect respectto to thethe longitudinal longitudinal direction. direction. Therefore, at Therefore, atthe thetime time of of thethe mounting mounting and and demounting demounting of the of the 20 20 cartridge cartridge BB relative relativetoto the the apparatus apparatus mainmain assembly assembly A andA the and the whole cartridge whole cartridgeB Bcan can slightly slightly incline incline within within the limits the limits of of the the gaps. Forthis gaps. For thisreason reasonand andthe theperpendicularity perpendicularityisisnot not meant strictly. meant strictly. However, However,even evenin insuch sucha acase, case,the thepresent present invention isaccomplished invention is accomplished with with thethe effects effects thereof. thereof. 25 25 Therefore, the Therefore, theterm" term"perpendicular perpendicular substantially" substantially" covers covers the the case where the case where thecartridge cartridge slightly slightly inclines. inclines.

[0521]

[0521] Between Between the the cartridge cartridge b andthe b and thecartridge cartridge accommodating portion accommodating portion 130A, 130A, small small gaps gaps are are provided provided in inorder order to to mount mount and and demount demount the the cartridge cartridge BB smoothly. more smoothly. more 30 30 specifically specifically and and the the small small gaps gaps are are provided betweenthe provided between the guide 140R1or guide 140R1 or140R2 140R2and and thethe guide guide 130R1 130R1 withwith respect respect to the to the longitudinal direction, longitudinal direction, between between thethe guide guide 140L1 140L1 or 140L2 or 140L2

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and the guide and the guide130L1 130L1with with respect respect to to the the longitudinal longitudinal direction. Therefore, direction. Therefore,atatthe thetime timeofofthe themounting mountingand and demounting of demounting ofthe thecartridge cartridge b relative b relative to the to the accommodating accommodating portion 130A portion 130Aand andthe thewhole whole cartridge cartridge B can B can slightly slightly incline incline 5 5 within the within the limits limits of of the the gaps. gaps. InInaddition, addition,a aslight slight positional deviationmay positional deviation may occur occur between between the the rotary rotary member member C C 2024200580

(movable member)and (movable member) andthe thedriving driving shaft shaft (180). (180) . For For this this reason, reason, the the perpendicularity perpendicularity is is not not meant meant strictly. However, strictly. However, even in such even in sucha acase, case,the the present present invention invention is accomplished is accomplished 10 10 with the with the effects effects thereof. thereof. Therefore, Therefore,thetheterm term"perpendicular "perpendicular substantially" coversthe substantially" covers the case case where where the the cartridge cartridge slightly slightly inclines. inclines.

[0522]

[0522] It has been It has been described describedthat that thethe axisaxis L2 is L2 is slantable orinclinable slantable or inclinablein in anyany direction direction relative relative to axis to the the axis 15 15 L1. However, L1. However,the theaxis axisL2L2does doesnot notnecessarily necessarilyneed needtotobe be linearly slantabletotothe linearly slantable the predetermined predetermined angle angle in full in the the full range range of of 360-degree 360-degree direction direction in in the the coupling coupling 150. For 150. For example, theopening example, the opening150g 150g cancan be be selected selected toslightly to be be slightly wider wider in in the the circumferential circumferential direction. direction. By By doing doing so, so, the the time time of of 20 20 the axis L2 the axis L2inclining incliningrelative relative to to the the axisaxis L1, L1, even even if itif isit is the case where the case whereititcannot cannot incline incline to to the the predetermined predetermined angleangle linearly, thecoupling linearly, the coupling150150 cancan rotate rotate to atoslight a slight degree degree around around the the axis axis L2. Therefore,it L2. Therefore, itcan canbe beinclined inclinedto tothe the predetermined angle. predetermined angle. In Inother otherwords, words,the theamount amountof ofthe theplay play inthe 25 in 25 therotational rotationaldirection directionofofthe theopening opening150g 150gisisselected selected properly if properly ifnecessary. necessary.

[0523]

[0523] In this manner, In this manner,the thecoupling coupling 150150 is is revolvable revolvable or swingableover or swingable overthe thefull-circumference full-circumference substantially substantially relative relative to to the the axis axis L1 L1 of of the the developing developing roller roller 110. More 110. More 30 30 particularly,the particularly, thecoupling coupling150150 is is pivotable pivotable over over the full- the full- circumference thereofsubstantially circumference thereof substantially relative relative to drum to the the drum shaft shaft 153. 153.

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[0524]

[0524] Furthermore, aswill Furthermore, as willbebe understood understood from from the the foregoing explanation, foregoing explanation, the the coupling coupling 150 150 is capable is capable of whirling of whirling in and substantially in and substantiallyover overthethe circumferential circumferential direction direction of the of the drum shaft drum shaft 153. 153. Here, Here,thethewhirling whirlingmotion motionisisnot notaamotion motion 5 5 with which with whichthe thecoupling coupling itself itself rotates rotates about about the axis the axis L2, but L2, but the inclinedaxis the inclined axisL2L2rotates rotates about about the the axisaxis L1the L1 of of the 2024200580

developing roller developing rolleralthough althoughthethe whirling whirling herehere does does not preclude not preclude the rotationofofthe the rotation thecoupling coupling perper se se about about the the axis axis L2 ofL2the of the coupling 150. coupling 150.

10 10 [0525]

[0525] In addition,asashas In addition, hasbeen been described described hereinbefore, hereinbefore, each coupling each couplinghas hasthe the function function of of transmitting transmitting the rotational the rotational force to the force to thedeveloping developing roller roller 110. 110.

[0526]

[0526] And, each And, each coupling, coupling,itit has has thethe rotational rotational force force reception surface(rotational reception surface (rotational force force receiving receiving portion) portion) 150e 150e 15 15 (8150e, 9150e, 9250e, (8150e, 9150e, 9250e,9350e, 9350e, 9450e, 9450e, 15150e) 15150e) for for receiving receiving the the rotational forcefrom rotational force fromthe the drive drive shaft shaft 180 180 (1180, (1180, 1280,1280, 9180)9180) by engaging by engagingwith withthe thepin pin (rotational (rotational force force applying applying portion) portion) 182 (1182, 9182) 182 (1182, 9182). . InInaddition, addition, it it has has the the rotational rotational forceforce transmitting surface(rotational transmitting surface (rotational force force transmitting transmitting portion) portion) 20 20 150h (1550h,1450h, 150h (1550h, 1450h,8150h, 8150h, 9150h, 9150h, 12150h, 12150h, 12151h, 12151h, andon) and SO so on) which transmits which transmitsthe therotational rotational force force received received through through the the rotational forcereceiving rotational force receiving portion portion 150e 150e to the to the developing developing roller roller 110. The rotational 110. The rotational force force received received by by the the rotational rotational force transmittingsurface force transmitting surface 150h 150h is is transmitted transmitted to the to the developingroller 25 developing 25 roller110 110through throughthe thepin pin(rotational (rotationalforce force receiving portion)155 receiving portion) 155(1155, (1155, 1355, 1355, 12155). 12155) .

[0527]

[0527] And, this And, this coupling couplingmoves moves from from this this pre-pre- engagement angularposition engagement angular position to to this this rotational rotational forceforce transmitting angularposition transmitting angular position in in response response to movement to the the movement of of 30 30 cartridge cartridge BBat atthe thetime time of of thethe rotary rotary C (supporting C (supporting member member 141190) (movablemember) 141190) (movable member) rotating rotating in in one one direction direction (movement). (movement) .

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- 143 31 Jan 2024

By this, By this, this this coupling coupling is is opposed opposed to to this this drive drive shaft. shaft. When When the rotary CCfurther the rotary furtherrotates rotatesin in said said one one direction direction from from the the position where position wherethe thecoupling coupling opposes opposes to the to the drive drive shaftshaft (movement), the coupling (movement) the coupling moves moves from from the the rotational rotational force force 5 5 transmitting angularposition transmitting angular positionto to thethe disengaging disengaging angular angular position in position in response response to to the the cartridge cartridge BB moving. moving. By Bythis, this,the the 2024200580

coupling disengagesfrom coupling disengages from thethe drive drive shaft. shaft.

[0528]

[0528] The couplinghas The coupling hasthe therecess recess 150z 150z (1450z, (1450z, 1550z, 1550z, 4150z, 515z0,15150z, 4150z, 515z0, 15150z,15150z, 15150z,andand so on) SO on) on the on the rotation rotation axis axis 10 L2.And, 10 L2. And, the the cartridge cartridge B moves B moves in in thethe direction direction substantially substantially perpendiculartotothe perpendicular theaxis axis L1 L1 of of thethe developing developing roller roller 110 by 110 by the the rotation rotation ofof the the rotary rotary C C in in said said one one direction. direction. InIn response to this, response to this,each each coupling coupling moves moves fromfrom the the pre-engagement pre-engagement angular position angular positiontotothe the rotational rotational force force transmitting transmitting angular angular 15 15 position,SO position, sothat thata part a part of of coupling coupling (downstream (downstream free free end end position 150A1, position 150A1,1850A1, 1850A1, 4150A1, 4150A1, 5150A1, 5150A1, 8150A1, 8150A1, 12150A1 12150A1 and SOand so on) which is on) which isthe thedownstream downstream portion portion withwith respect respect to the to the rotational rotational direction direction of of the the rotary rotary C is permitted C is permitted to to circumvent circumvent the the drive drive shaft. Bythis, shaft. By this,the therecess recesscovers coversthe the 20 20 free free end end of of the the drive drive shaft. And, the shaft. And, the rotational rotational force force receiving portionengages, receiving portion engages, in in thethe rotational rotational direction direction of the of the coupling, withthe coupling, with therotational rotational force force applying applying portion portion whichwhich projects in projects inthe thedirection direction perpendicular perpendicular to the to the axis axis of the of the drive shaft drive shaft in in the the free free end end side side of of the the drive drive shaft. shaft. ByBythis, this, 25 25 from the drive from the driveshaft, shaft,the the coupling coupling receives receives the the rotational rotational force force and and rotates. And, the rotates. And, the rotary rotary CC further further moves moves to to said said one one direction. Bythis, direction. By this,the thecartridge cartridgeBBmoves movesininthe the direction substantially direction substantially perpendicular perpendicular to to the the axis axis L1. L1. It It responds to this, responds to this,the thecoupling coupling is is moved moved to the to the disengaging disengaging 30 30 angularposition, angular position,ininthe therotational rotationaldirection, direction,from fromthe the rotational rotational force force transmitting transmitting angular angular position, position, so SO that that aa part of part of upstream upstreamdrive drive shafts shafts of of this this coupling coupling member member (upstream free end (upstream free endposition position 150A2, 150A2, 1750A2, 1750A2, 4150A2, 4150A2, 5150A2, 5150A2,

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12150A2 12150A2 and and so SO on) is permitted on) is permitted circumventing circumventing the the drive drive shaft. Bythis, shaft. By this,the thecoupling couplingdisengages disengagesfrom fromthe thedrive driveshaft. shaft.

[0529]

[0529] The rotationalforce The rotational forcereceiving receiving portions portions (150e, (150e, 15150e, and SO 15150e, and soon) on)are aredisposed, disposed, respectively respectively on a on a phantom phantom 5 5 circle C1 which circle C1 whichhas hasa acenter center O on O on the the rotation rotation axis axis L1 ofL1 of this this 2024200580

each coupling, each coupling,atatthe the positions positions diametrically diametrically opposed opposed interposing interposing the the center center O. The forces O. The forces received received by by the the couplings couplings by by this this disposition disposition are are force force couples. couples. ForForthis this reason, the couplings reason, the couplingscan can continue continue rotary rotary motion motion only only with with the the 10 10 force force couple. In view couple. In view of of this, this, each each coupling coupling can can rotate rotate without determining without determiningthe the position position of the of the rotation rotation axis.axis.

[0530]

[0530] The referencenumerals The reference numeralsin in thethe drawing drawing which which do do not appear in not appear inthe thespecification specificationareare the the corresponding corresponding members members in the case in the case that thatthe thealphabets alphabets thereof thereof are are the the same.same.

15 15 The other The other embodiments: embodiments:

[0531]

[0531] In this embodiment, In this embodiment,although although thethe rotary rotary rotates rotates in the clockwise in the clockwisedirection directionon on thethe drawing drawing (Figure (Figure 17, for 17, for example), itmay example), it mayrotate rotate in in thethe opposite opposite direction. direction.

[0532]

[0532] In addition,the In addition, theimage image forming forming position position 20 20 (developing position)may (developing position) maybebe another another position. position.

[0533]

[0533] In addition,the In addition, therotary rotaryof of thethe present present embodiment carriesthe embodiment carries the four four color color developing developing cartridges. cartridges. However, thedeveloping However, the developing cartridge cartridge for for the the black black mayfixed may be be fixed and the cartridges and the cartridgesfor for the the other other three three colors colors maycarried may be be carried 25 25 on the rotary. on the rotary.

[0534]

[0534] In addition,ininthis In addition, thisembodiment, embodiment, thethe developing developing roller is aa contact roller is contactdevelopment development type type and and usesuses an elastic an elastic

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roller, but it roller, but itmay maybebea a metal metal sleeve sleeve which which contains contains a magnet a magnet roller employedbybythe roller employed thejumping jumping development. development.

[0535]

[0535] The developingcartridge The developing cartridgeandand thethe developing developing device are provided device are providedwith with thethe developing developing roller roller (or developing (or developing 5 5 meansincluding means includingthethedeveloping developingroller) roller)atatleast. least.ForFor this this 2024200580

reason, for example, reason, for example,the the developing developing cartridge cartridge (developing (developing device) device) is is the the developing developing roller. Or,it roller. Or, itmay maybebeaacartridge cartridge which includes which includesintegrally integrallythethe developing developing means means including including the the developing roller developing rollerand and the the cleaning cleaning means means and and which which is is 10 10 detachablymountable detachably mountabletotothe theapparatus apparatusmain mainassembly, assembly,inin addition tothe addition to thetype typeinin the the embodiment embodiment described described aboveabove further, it may further, it maybebea acartridge cartridge which which includes includes integrally integrally the the developing roller(or developing roller (ordeveloping developing means means including including the the developing roller)and developing roller) and the the charging charging means means and and which which is is 15 15 detachably mountabletoto detachably mountable thethe apparatus apparatus mainmain assembly. assembly.

[0536]

[0536] Further, inaddition, Further, in addition,inin this this embodiment, embodiment, although although aa laser laserbeam beamprinter printer is is taken taken as image as an an image forming forming device, thepresent device, the presentinvention invention is is notnot limited limited to this to this example. example. For example,the For example, thepresent present invention invention can can be used be used to other to the the other 20 20 image formingapparatuses, image forming apparatuses, such such as as an electrophotographic an electrophotographic copying machine,a afacsimile copying machine, facsimile device, device, or aorword a word processor. processor. according tothe according to theembodiments embodiments described described above above the engagement the engagement and disengagementofofthe and disengagement the coupling coupling are are possible possible in the in the direction substantially direction substantially perpendicular perpendicular to the to the axis axis of drive of the the drive 25 25 shaft providedininthe shaft provided themain main assembly assembly of the of the electrophotographic electrophotographic image formingapparatus image forming apparatus relative relative to to the the drive drive shaft shaft by the by the movement in movement in one onedirection directionofofthe themovable movablemember member(the (therotary, rotary, for example,the for example, thecartridge cartridge supporting supporting member, member, cash cash drawer). drawer).

[0537]

[0537] As has As has been beendescribed described hereinbefore, hereinbefore, the the axisaxis of of 30 30 the couplingcan the coupling cantake takethe the different different angular angular positions positions in thein the present invention. present invention. More Moreparticularly, particularly,the theaxis axisof ofthe the

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coupling cantake coupling can takethe thepre-engagement pre-engagement angular angular position, position, the the rotational forcetransmitting rotational force transmitting angular angular position, position, and the and the disengaging angular disengaging angular position. position. TheThecoupling couplingcan canbe beengaged engaged with the with the drive driveshaft shaftinin thethe direction direction substantially substantially 5 5 perpendiculartotothe perpendicular theaxis axis of of thethe providing-in providing-in the main the main assembly assembly drive drive shaft shaft by by this this structure. structure. InInaddition, addition,the the 2024200580

coupling canbebedisengaged coupling can disengaged from from thethe drive drive shaft shaft in the in the direction substantially direction substantially perpendicular perpendicular to the to the axis axis of drive of the the drive shaft. Thepresent shaft. The presentinvention inventioncan canbebeapplied appliedto toaadeveloping developing 10 10 device, aa drum device, drumcoupling coupling member, member, andand an electrophotographic an electrophotographic image formingdevice. image forming device.

[INDUSTRIAL APPLICABILITY] [INDUSTRIAL APPLICABILITY]

[0538]

[0538] According to According tothe thepresent present invention, invention, it possible it is is possible to provide aadeveloping to provide developing apparatus apparatus capable capable of engaging of engaging a a 15 15 coupling memberprovided coupling member providedto to thethe developing developing apparatus apparatus (developing cartridge)with (developing cartridge) with a driving a driving shaft shaft by moving by moving the the developing apparatus developing apparatus(developing (developing cartridge) cartridge) in ain a direction direction substantially perpendicular substantially perpendicular to to an an axial axial direction direction of the of the driving shafteven driving shaft evenininthe the case case where where a main a main assembly assembly is not is not 20 20 provided with provided witha amechanism mechanism forfor moving moving a main a main assembly-side assembly-side coupling memberininthe coupling member the axial axial direction direction by abysolenoid. a solenoid. According to According tothe thepresent present invention, invention, it also it is is also possible possible to to provide an provide anelectrophotographic electrophotographic image image forming forming apparatus apparatus using using the developingapparatus the developing apparatusandand thethe coupling coupling member member used used in the in the 25 25 developing apparatus. developing apparatus.

[0539]

[0539] While the While the invention invention has has been been described described with with reference tothe reference to thestructures structures disclosed disclosed herein, herein, itnot it is is not confined tothe confined to thedetails details set set forth forth and and thisthis application application is is intended to cover intended to coversuch suchmodifications modifications or changes or changes as come as may may come 30 30 within the within thepurpose purposeofofthethe improvements improvements or the or the scopescope of the of the following claims. following claims.

10156073_1 10156073 1 905731D2 905731D2

Claims

CLAIMS:

1. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller configured to remove developer from a surface of the developer roller and to supply developer to the surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, 2024200580

the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least two projections that are at least partly outside of the casing, each of the at least two projections being open to the axis L2, wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position in a direction opposite to the direction the coupling member is inclined when in the second position.

2. The image forming apparatus cartridge of Claim 1, further comprising: a developer roller gear operatively connected to the developer roller; a developer supplying roller gear operatively connected to the developer supplying roller; and an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

3. The image forming apparatus cartridge of Claim 1, wherein, when the coupling member is in the second position or the third position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

4. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller configured to remove developer from the surface of the developer roller and to supplying developer to a surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least two projections that are at least partly outside of the casing, each of the at least two projections being open to the axis L2,

46838997_1

wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller and (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position.

5. The image forming apparatus cartridge of Claim 4, further comprising: a developer roller gear operatively connected to the developer roller; a developer supplying roller gear operatively connected to the developer supplying roller; and 2024200580

an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

6. The image forming apparatus cartridge of Claim 4, wherein, when the coupling member is in the second position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

7. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller configured to remove developer from a surface of the developer roller and to supply developer to the surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least one projection that is at least partly outside of the casing, the at least one projection being open to the axis L2, wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position in a direction opposite to the direction the coupling member is inclined when in the second position.

8. The image forming apparatus cartridge of Claim 7, further comprising: a developer roller gear operatively connected to the developer roller; a developer supplying roller gear operatively connected to the developer supplying roller; and an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

46838997_1

9. The image forming apparatus cartridge of Claim 7, wherein, when the coupling member is in the second position or the third position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

10. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; 2024200580

a developer supplying roller configured to remove developer from a surface of the developer roller and to supply developer to the surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least one projection that is at least partly outside of the casing, the at least one projection being open to the axis L2, wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller and (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position.

11. The image forming apparatus cartridge of Claim 10, further comprising: a developer roller gear operatively connected to the developer roller; a developer supplying roller gear operatively connected to the developer supplying roller; and an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

12. The image forming apparatus cartridge of Claim 10, wherein, when the coupling member is in the second position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

13. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller contacting the developer roller and configured to supply developer to a surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least two projections that are at least partly outside of the casing, each of the at least two projections being open to the axis L2,

46838997_1

wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position in a direction opposite to the direction the coupling member is inclined when in the second position.

14. The image forming apparatus cartridge of Claim 13, further comprising: a developer roller gear operatively connected to the developer roller; 2024200580

a developer supplying roller gear operatively connected to the developer supplying roller; and an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

15. The image forming apparatus cartridge of Claim 13, wherein, when the coupling member is in the second position or the third position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

16. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller contacting the developer roller and configured to supply developer to a surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least two projections that are at least partly outside of the casing, each of the at least two projections being open to the axis L2, wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller and (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position.

17. The image forming apparatus cartridge of Claim 16, further comprising: a developer roller gear operatively connected to the developer roller; a developer supplying roller gear operatively connected to the developer supplying roller; and an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

46838997_1

18. The image forming apparatus cartridge of Claim 16, wherein, when the coupling member is in the second position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

19. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; 2024200580

a developer supplying roller contacting the developer roller and configured to supply developer to a surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational force, the second end portion including at least one projection that is at least partly outside of the casing, the at least one projection being open to the axis L2, wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller, (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position, and (iii) a third position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position in a direction opposite to the direction the coupling member is inclined when in the second position.

20. The image forming apparatus cartridge of Claim 19, further comprising: a developer roller gear operatively connected to the developer roller; a developer supplying roller gear operatively connected to the developer supplying roller; and an intermediate gear operatively connected to the developer roller gear and the developer supplying roller gear, wherein the coupling member is operatively connected to the developer roller via the intermediate gear and the developer roller gear and operatively connected to the developer supplying roller via the intermediate gear and the developer supplying roller gear.

21. The image forming apparatus cartridge of Claim 19, wherein, when the coupling member is in the second position or the third position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

22. An image forming apparatus cartridge comprising: a casing; developer contained within the casing; a developer roller having an axis L1, the developer roller being rotatably supported in the casing to permit rotation about the axis L1; a developer supplying roller contacting a surface of the developer roller and configured to supply developer to the surface of the developer roller; and a coupling member having an axis L2 about which the coupling member is rotatable, the coupling member including (i) a first end portion operatively connected to the developer roller and the developer supplying roller and (ii) a second end portion for receiving a rotational

46838997_1

force, the second end portion including at least one projection that is at least partly outside of the casing, the at least one projection being open to the axis L2, and wherein the coupling member is movable between (i) a first position in which the axis L2 of the coupling member is substantially parallel to and offset from the axis L1 of the developer roller and (ii) a second position in which the axis L2 of the coupling member is inclined with respect to the position of the axis L2 when the coupling member is in the first position.

23. The image forming apparatus cartridge of Claim 22, further comprising: a developer roller gear operatively connected to the developer roller; 2024200580

24. The image forming apparatus cartridge of Claim 22, wherein, when the coupling member is in the second position, the axis L2 of the coupling member is inclined between 20 degrees to 60 degrees with respect to the position of the axis L2 when the coupling member is in the first position.

Canon Kabushiki Kaisha Patent Attorneys for the Applicant SPRUSON & FERGUSON

46838997_1