JP4487641B2 - Paper feeding device and image forming apparatus - Google Patents

Description

  The present invention relates to a paper feeding device used in an image forming apparatus such as a copying machine, a printer, and a facsimile machine, and the image forming apparatus.

Conventionally, the drive transmission structure to the roll of the paper feeding device in the image forming apparatus employs a configuration in which it is transmitted to the pickup roll via a feed roll or a drive means (gear, etc.) on the feed roll shaft. The following patent documents are well-known as those in which this type of prior art is described.
Patent Document 1: Japanese Patent Application Laid-Open No. 10-212044 Patent Document 2: Japanese Patent Application Laid-Open No. 6-115732 The conventional techniques described in Patent Documents 1, 2 and the like cannot be said to have good workability when replacing a roll. The improvement required a structural review.

As an example of roll exchange without using a tool in the prior art, there is roll exchange means having a structure in which a pin supporting the roll is pushed in and removed by a finger. The following patent documents are conventionally known as this type of technology.
Patent Document 3: Japanese Patent Laid-Open No. 2000-229736 Patent Document 4: Japanese Patent Laid-Open No. 2000-229737 In the techniques described in these Patent Documents 3 and 4, a structure of a retard roll, a feed roll, a pick-up roll, and an interposition It is exchanged with a structure including a gear and a bracket.

: JP-A-10-212044 : JP-A-6-115732 : JP 2000-229736 A : JP 2000-229737 A

The prior art described in Patent Documents 3 and 4 is a technique for exchanging the feed roll and the pickup roll at the same time as described above. In this technique, even a pickup roll with relatively little wear deterioration due to a difference in the transport load applied to the roll. In some cases, it is necessary to replace the feed roll in accordance with the wear deterioration life of the feed roll. Furthermore, gears and brackets that have a longer life than the roll life will be replaced in the same manner, and the cost of replacement parts is necessary.
In addition, tools are required for disassembling work for reuse and recycling of used parts, and the cost of these work is high.
Further, it is difficult to change the feed roll to support by pins in the conventional drive mechanism, and it is necessary to change the drive transmission method and the rotation fulcrum of the pickup roll support bracket.

In view of the above-described circumstances, the present invention has the following contents (O01) to (O04) as technical problems in a sheet feeding device.
(O01) Improve inefficient replacement by simultaneous replacement of a feed roll and pickup roll in the prior art and a structure including an intervening gear and bracket, and each of the feed roll and pickup roll has no tools at an appropriate timing. in to be able to easily exchange.
(O02) The structure to be replaced should be able to be easily reused and disassembled for recycling without tools.
(O03) By rotating the pick-up roll rotation drive without passing through the feed roll and the drive transmission means on the feed roll shaft, the drive shaft serving as the rotation fulcrum of the support bracket of the pick-up roll can be placed at an arbitrary position. To be able to do it.
(O04) To enable efficient drive arrangement corresponding to a reduction in space.

(Invention)
Next, the present invention that has solved the above problems will be described. In order to facilitate the correspondence between the elements of the present invention and elements of specific examples (examples) of the embodiments described later, Add the code enclosed in parentheses. The reason why the present invention is described in correspondence with the reference numerals of the embodiments described later is to facilitate understanding of the present invention, and not to limit the scope of the present invention to the embodiments.

(First invention)
The sheet feeding device according to the first aspect of the present invention includes the following structural requirements (A01) to (A05).
(A01) It is rotatably supported between an operation position where a paper feeding operation is performed and a roll attaching / detaching position which is rotated upward about a horizontal axis, and is disposed above the paper feed side end of the paper feed tray. A rotation member for paper feed, which has a roll mounting surface that faces downward when rotated to the operating position and faces upward at the roll attaching / detaching position rotated upward; a feed roll on the roll mounting surface side; The paper feed rotation member on which the pickup roll mounting member is rotatably mounted;
(A02) in a state where the rotating member for the sheet feeding is rotated to the operating position, rotatable and pick-up roll is mounted between the upper position rotated downward position and upwardly pivoted downward The pickup roll mounting member,
(A03) an elastic member for applying a rotational force to the pickup roll mounting member so as to always rotate the pickup roll mounting member downward;
(A04) A solenoid having a telescopic rod fixedly supported, and the pickup roll mounting member that receives a force rotating downward by the elastic member when the solenoid is not energized against the force of the elastic member. and a upward movement elastic member acts to move the upper position, the state of being energized to the solenoid, the solenoid regulates the upward movement elastic member, the pickup roll mounting the elastic member pickup roll causes moving member downward mounting member position adjusting device,
(A05) A rotation transmission shaft rotatably supported by the paper feed rotation member, and a rotation introducing gear mounted to one end of the rotation transmission shaft, wherein the paper feed rotation member is in the operating position. The rotation introducing gear to which the rotational force is transmitted from the fixedly arranged gear in a state where the rotation is rotated, the rotation output gear attached to the other end of the rotation transmission shaft, and the rotation of the rotation output gear to the feed roll A roll rotation transmission gear having a feed roll rotation transmission gear for transmission and a pickup roll rotation transmission gear for transmitting the rotation of the rotation output gear to the pickup roll, and having the pickup roll rotation transmission gear different from the feed roll rotation transmission gear Element.

(Operation of the first invention)
In the sheet feeding device according to the first aspect of the present invention having the above-described configuration requirements (A01) to (A05), the sheet feeding device can be rotated between an operation position where the sheet feeding operation is performed and a roll attaching / detaching position rotated upward about a horizontal axis. The paper feed rotating member supported by the paper feed tray and disposed above the paper feed side end of the paper feed tray is downward in the state of being rotated to the operation position and upward in the roll attaching / detaching position of the upward rotation. And a feed roll and a pickup roll mounting member are rotatably mounted on the roll mounting surface side.
The pickup roll mounting member includes a lower position (paper removal position) rotated downward and an upper position (standby position) rotated upward in a state where the paper feeding rotation member is rotated to the operating position. And a pick-up roll is mounted.
The elastic member applies a rotational force to the pickup roll mounting member so as to always rotate the pickup roll mounting member downward.
A solenoid having a telescopic rod fixedly supported and the pickup roll mounting member that receives a force of rotating downward by the elastic member when the solenoid is not energized is placed in the upper position against the force of the elastic member. pickup roller mounting member position adjusting apparatus having an upward movement elastic member acts to move the, in the state of being energized to the solenoid, the solenoid regulates the upward movement elastic member, the elastic member make move the pickup roller mounting member downwardly.
The rotation transmission shaft of the roll rotation force transmission member is rotatably supported by the sheet feeding rotation member. The rotation introducing gear attached to one end of the rotation transmission shaft receives the rotational force from the fixed arrangement gear in a state where the sheet feeding rotation member is rotated to the operation position. The rotation of the rotation output gear mounted on the other end of the rotation transmission shaft is transmitted to the feed roll by a feed roll rotation transmission gear. The pickup roll rotation transmission gear different from the feed roll rotation transmission gear transmits the rotation of the rotation output gear to the pickup roll.

(First Embodiment 1)
A sheet feeding device according to a first aspect of the present invention is characterized in that in the first aspect of the present invention, the following structural requirement (A06) is provided.
(A06) wherein a pick-up roll mounting member supporting shaft for pickup roll mounting member integrally rotated, the pickup roller mounting member supporting shaft arranged at a position different from the rotation axis of the feed roll.

(Operation of Form 1 of the First Invention)
In the sheet feeding apparatus according to the first first invention having the above configuration requirements (A06) is pick-up roll mounting member support shaft to the pickup roller mounting member and integrally rotated is different from the rotation axis of the feed roll Placed in position.

(First Embodiment 2)
A sheet feeding device according to a second aspect of the first invention is characterized in that, in the first invention or the first aspect of the first invention, the following structural requirements (A07) and (A08) are provided.
(A07) It has a projecting member that rotates integrally with the pick-up roll mounting member on which the pick-up roll is mounted and projects in the radial direction at the end in the axial direction, and is rotatably supported by the paper-feeding rotating member. A pickup roll mounting member supporting shaft, wherein the pickup roll mounting member is rotated downward and an upper position is rotated upward in a state where the paper feeding rotation member is moved to the operating position. The pick-up roll mounting member support shaft rotatable between
(A08) a solenoid having a telescopic rod fixedly supported, an abutting member connected to a distal end portion of the telescopic rod and contacting a protruding member of the pickup roll mounting member support shaft, and the pickup roll mounting member An elastic member for upward movement that causes the abutting member to abut against the protruding member so as to move to the upper position against the force of the elastic member, and when the solenoid is energized, the elastic member is the pickup roller mounting member the abutment member pick-up roll to move the mounting member position adjusting device in a position for allowing a move downwardly,

(Operation of the second aspect of the first invention)
In the sheet feeding device according to the second aspect of the present invention having the structural requirements (A07) and (A08), the sheet feeding device rotates integrally with the pickup roll mounting member on which the pickup roll is mounted and is radially at the axial end. A pick-up roll mounting member support shaft having a protruding member protruding in the direction is rotatably supported by the sheet feeding rotation member. The pickup roll mounting member support shaft is located between a lower position where the pickup roll mounting member is rotated downward and an upper position where the pickup roll mounting member is rotated upward in a state in which the paper feeding rotation member is moved to the operating position. Rotate.
A solenoid having a telescopic rod fixedly supported; an abutting member connected to a distal end of the telescopic rod and abutting against a protruding member of the pickup roll mounting member support shaft; and the pickup roll mounting member connected to the elastic member. The pick-up roll mounting member position adjusting device having an upward moving elastic member that makes the contact member contact the protruding member so as to move to the upper position against a force is in a state where the solenoid is energized. The contact member is moved to a position that allows the elastic member to move the pickup roll mounting member downward.

(Embodiment 3 of the first invention)
A sheet feeding device according to a third aspect of the present invention is characterized in that, in the second aspect of the first aspect of the present invention, the following structural requirements (A09) and (A010) are provided.
(A09) The pickup roll mounting member support shaft configured by a cylindrical shaft,
(A010) The rotation transmission shaft that penetrates the inside of a cylindrical shaft constituting the pickup roll mounting member support shaft.

(Operation of the third aspect of the first invention)
In the paper feeding device according to the third aspect of the first invention having the structural requirements (A09) and (A010), the rotation transmission shaft is an interior of a cylindrical shaft that constitutes the pickup roll mounting member support shaft formed of a cylindrical shaft. To penetrate.

(Second invention)
The image forming apparatus of the second invention, you comprising the constituent features described below (A011).
(A011) The sheet feeding device according to any one of the first invention or the first to third aspects of the first invention.

(Operation of the second invention)
The image forming apparatus according to the second aspect of the present invention having the configuration requirement (A011) includes the sheet feeding device according to any one of the first aspect or the first aspect of the first aspect of the invention, and is used in the second aspect of the invention. The sheet feeding device that performs the same function as the sheet feeding device according to any one of the first invention or the first to fourth embodiments of the first invention.

The above-described present invention has the following effects (E01) to (E04).
(E01) Improve inefficient replacement by simultaneous replacement of the structure including the feed roll and the pickup roll and the intervening gears and brackets in the prior art, and each of the feed roll and the pickup roll has no tools at an appropriate timing. Can be replaced easily. (E02) The structure to be replaced should be easily disassembled for subsequent reuse and recycling without tools.
(E03) By rotating the pick-up roll rotation drive without passing through the feed roll and the drive transmission means on the feed roll shaft, the drive shaft serving as the rotation fulcrum of the support bracket of the pick-up roll can be placed at an arbitrary position. To be able to do it.
(E04) To enable efficient drive arrangement corresponding to a reduction in space.

Next, specific examples (examples) of the embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, the up-down direction is the Z-axis direction, and arrows X, -X, Y, -Y, The direction indicated by Z and -Z or the indicated side is defined as the front side, the rear side, the right side, the left side, the upper side, the lower side, or the front side, the rear side, the right side, the left side, the upper side, and the lower side, respectively.
In the figure, “•” in “○” means an arrow heading from the back of the page to the front, and “×” in “○” is the front of the page. It means an arrow pointing from the back to the back.

Example 1
FIG. 1 is an overall explanatory view of an image forming apparatus (tandem digital color copying machine) according to a first embodiment of the present invention.
In FIG. 1, the image forming apparatus U includes a UI (user interface), an image input apparatus U1, a paper feeding apparatus U2, an image forming apparatus main body U3, and a paper processing apparatus U4.

(User interface UI)
The UI has a copy start key (not shown), a copy number setting key, an input key such as a numeric keypad, and a display UI1.
(Image input device U1)
The image input device U1 includes an automatic document feeder and an image scanner.
In FIG. 1, in the image input device U1, reflected light from an illuminated original (not shown) is reflected by an exposure optical system (not shown) and a CCD (solid-state imaging device) belt-shaped pile fabric image processing circuit (not shown). (Red), G (green), and B (blue) image data are converted and input to the image forming apparatus body U3 at a predetermined timing.

(Paper Feeder U2)
The sheet feeding device U2 includes a plurality of sheet feeding trays TR1 to TR4, a sheet feeding path SH1 for taking out the recording sheets S for image recording accommodated in the sheet feeding trays TR1 to TR4, and conveying them to the image forming apparatus body U3. Have.

(Image forming apparatus body U3)
In FIG. 1, an image forming apparatus body U3 includes an image recording unit (details will be described later) for recording an image on a recording sheet S conveyed from the sheet feeding device U2, a toner dispenser device U3a, a sheet conveying path SH2, and a sheet discharge. A path SH3, a sheet reversing path SH4, a sheet circulation path SH6, and the like are included.
Further, the image forming apparatus main body U3 includes a control C, a laser driving circuit D and a power supply circuit E controlled by the control C, and the like. The laser drive circuit D, the operation of which is controlled by the control C, is laser driven in accordance with Y (yellow), M (magenta), C (cyan), and K (black) image data input from the image input device U1. Signals are output to the toner image forming apparatuses UY, UM, UC, and UK of latent images forming apparatuses ROSy, ROSm, ROSc, and ROSk of the respective colors at a predetermined timing. The toner image forming apparatuses UY, UM, UC, UK of the respective colors are movable between a drawing position pulled out in front of the image forming apparatus main body U3 and a mounting position mounted inside the image forming apparatus main body U3. It is supported by.

In FIG. 1, a charging device CCk, a developing device Gk, a cleaner CLk, and the like are disposed around a photosensitive drum (toner image carrier) Pk of a K (black) toner image forming apparatus UK.
Further, around the photosensitive drums Py, Pm, and Pc of other toner image forming apparatuses UY, UM, and UC, chargers CCy, CCm, CCc, and developing units Gy, similar to those around the photosensitive drum Pk, respectively. Gm, Gc, cleaners CLy, CLm, CLc, etc. are arranged.

  In FIG. 1, photosensitive drums Py, Pm, Pc, Pk are uniformly charged by chargers CCy, CCm, CCc, CCk, respectively, and then output from the latent image forming devices ROSy, ROSm, ROSc, ROSk. An electrostatic latent image is formed on the surface by the laser beams Ly, Lm, Lc, and Lk. The electrostatic latent images on the surfaces of the photosensitive drums Py, Pm, Pc, and Pk are Y (yellow), M (magenta), C (cyan), and K (black) colors by developing units Gy, Gm, Gc, and Gk. The toner image is developed.

The toner images on the surfaces of the photosensitive drums Py, Pm, Pc, and Pk are sequentially transferred onto the intermediate transfer belt B by the primary transfer rolls T1y, T1m, T1c, and T1k, and a color image is transferred onto the intermediate transfer belt B. It is formed. The color toner image formed on the intermediate transfer belt B is conveyed to the secondary transfer area Q4.
In the case of only black image data, only the K (black) photosensitive drum Pk and the developing device Gk are used, and only a black toner image is formed.
After the primary transfer, residual toner on the surface of the photosensitive drums Py, Pm, Pc, and Pk is cleaned by the photosensitive drum cleaners CLy, CLm, CLc, and CLk.

  The belt module BM includes a belt support roll (Rd, Rt, Rw, belt) including the intermediate transfer belt B, a belt drive roll Rd, a tension roll Rt, a walking roll Rw, a plurality of idler rolls (free rolls) Rf, and a backup roll T2a. Rf, T2a) and the primary transfer rolls T1y, T1m, T1c, T1k. The intermediate transfer belt B is supported by the belt support rolls (Rd, Rt, Rw, Rf, T2a) so as to be rotatable in the direction of the arrow Ya.

A secondary transfer unit Ut is disposed below the backup roll T2a. The secondary transfer roll T2b of the secondary transfer unit Ut is disposed so as to be separated and press-contactable (separable) to the backup roll T2a with the intermediate transfer belt B interposed therebetween, and the secondary transfer roll T2b is arranged as an intermediate transfer belt. A secondary transfer region Q4 is formed by a region (nip) in pressure contact with B. A contact roll T2c is in contact with the backup roll T2a, and a secondary transfer device (transfer device) T2 is constituted by the rolls T2a to T2c.
A secondary transfer voltage having the same polarity as the toner charging polarity is applied to the contact roll T2c from the power supply circuit controlled by the control C at a predetermined timing.

A sheet conveyance path SH2 is disposed below the belt module BM. The recording sheet S fed from the sheet feeding path SH1 of the sheet feeding device U2 is conveyed to the registration roll Rr of the sheet conveying path SH2, and the timing at which the color toner image is conveyed to the secondary transfer region Q4. In addition, the sheet is conveyed to the secondary transfer region Q4 through the registration-side sheet guide SGr and the pre-transfer sheet guide SG2.
The registration-side sheet guide SGr is fixed to the image forming apparatus main body U3 together with the registration roll Rr.
The color toner image on the intermediate transfer belt B is transferred to the recording paper S by the secondary transfer device T2 when passing through the secondary transfer region Q4. In the case of a full-color image, the toner images primarily transferred onto the surface of the intermediate transfer belt B are secondarily transferred onto the recording paper S all at once.

  The intermediate transfer belt B after the secondary transfer is cleaned by a belt cleaner CLB. The secondary transfer roll T2b and the belt cleaner CLB are disposed so as to be able to be separated from and contacted (separated and freely contacted) with the intermediate transfer belt B.

The recording sheet S on which the toner image is secondarily transferred is an area where the pair of fixing rolls Fh and the pressure rolls Fp of the fixing device F are in pressure contact with each other through the post-transfer sheet guide SG3 and the sheet conveying belt BH (fixing area). Transported to Q5. The toner image on the recording paper S is heated and fixed by the fixing device F when passing through the fixing region Q5. A switching gate GT1 is provided on the downstream side of the fixing device F. The switching gate GT1 selectively switches the recording sheet S, which has been conveyed through the sheet conveyance path SH2 and heated and fixed in the fixing region Q5, to either the sheet discharge path SH3 or the sheet reversing path SH4. The sheet S conveyed to the sheet discharge path SH3 is conveyed to the sheet conveyance path SH5 of the sheet processing apparatus U4.
After the curl is corrected by the curl correction member U4a arranged in the paper transport path SH5, the paper is discharged face up (the image fixing surface of the paper faces upward) from the discharge roll Rh to the discharge tray TH1 of the paper processing device U4.

  The sheet conveyed to the sheet reversing path SH4 side of the image forming apparatus main body U3 by the switching gate GT1 is conveyed to the sheet reversing path SH4 of the image forming apparatus main body U3 through the mylar gate GT2 constituted by a sheet member. . After reversing the sheet conveyed to the sheet reversing path SH4, the sheet is conveyed to the sheet conveying paths SH3 and SH5 and face-down from the sheet discharge tray TH1 of the sheet processing apparatus U4 (the image fixing surface of the sheet faces downward). Can be discharged. In that case, the sheet is switched back immediately after the rear end of the sheet passes through the Mylar gate GT2. The Mylar gate GT2 once passes the recording sheet S conveyed to the sheet reversing path SH4, and once the recording sheet S passed through is switched back and conveyed, it is conveyed to the sheet processing device U4 side.

A sheet circulation path SH6 is connected in the middle of the sheet reversing path SH4 of the image forming apparatus main body, and a mylar gate GT3 is disposed at the connection portion. The downstream end of the sheet reversing path SH4 of the image forming apparatus main body is connected to the sheet reversing path SH7 of the sheet processing apparatus U4.
The sheet transported to the sheet transport path SH4 through the switching gate GT1 is transported to the sheet reversing path SH7 side of the sheet processing apparatus U4 by the mylar gate GT3. The Mylar gate GT3 once passes the recording sheet S conveyed through the sheet reversing path SH4 as it is, and when the recorded recording sheet S is switched back, the switched-back sheet is conveyed to the sheet circulation path SH6 side.
The recording sheet S conveyed to the sheet circulation path SH6 is retransmitted to the secondary transfer area Q4 through the sheet feeding path SH1.

The sheet conveyed from the sheet conveying path SH3 or the sheet reversing path SH4 to the sheet processing apparatus U4 is conveyed from the sheet conveying path SH5 of the sheet processing apparatus U4 to the gate GT4. The curl correction device U4a is disposed on the downstream side of the gate GT4 in the sheet conveyance direction. The curl correction device U4a includes a first curl correction member L1 and a second curl correction member L2. The gate GT4 conveys the sheet conveyed from the sheet conveying path SH5 to either the first curl correction member L1 or the second curl correction member L2 according to the curl direction of the sheet. The first and second curl correction members L1 and L2 have a curl correction rotating belt and a curl correction rotating roll pressed against the curl correction rotating belt. The paper passing through the nip, which is the pressure contact area between the curl correction rotating belt and the curl correction rotating roll pressed against it, is corrected for curl.

  A sheet transport path SH is constituted by the elements indicated by the symbols SH1 to SH7. Further, the sheet conveying device SU is constituted by the elements indicated by the symbols SH, Ra, Rr, Rh, SGr, SG1 to SG3, BH, and GT1 to GT3.

FIG. 2 is an enlarged explanatory view of a main part of FIG. 1, and is an explanatory view of a paper take-out portion at the right end portion of the paper feed tray TR4.
1 and 2, wherein each of the left and right of each paper feed tray TR1~TR 4 (Y-axis direction), longitudinal (X-axis direction, that is, the direction perpendicular to the paper surface in FIG. 1 to FIG. 2) rails 1 extending , 1 are arranged. A roller 3 (see FIG. 2) is rotatably supported on the lower side of the lower surface of the rail 1 disposed on the left and right of each of the paper feed trays TR1 to TR4. The upper part of the roller 3 protrudes above the rail 1 from a hole formed in the lower surface of the rail 1.

  In FIG. 2, guided rails 4 bulging outwardly are provided at the lower portions on the left and right sides of each of the paper feed trays TR <b> 1 to TR <b> 4, and the guided rail 4 is the rail 1. The lower surface of the roller 3 is supported. Accordingly, each of the paper feed trays TR1 to TR4 is configured to be able to enter and exit in the front-rear direction (X-axis direction) along the left and right rails 1 and 1.

As can be seen from FIG. 2, a paper placement plate 7 on which paper is placed is accommodated on the upper surface of the bottom plate 6 of each of the paper feed trays TR1 to TR4. The paper placing plate 7 is configured to be raised and lowered by an elevating mechanism using a wire (not shown). The structure for raising and lowering the paper placement plate is conventionally known, and various conventionally known structures can be employed.
When the paper placement plate 7 is raised and the paper placed on the paper placement plate 7 is sent out and transported, both side edges along the paper transport direction are the paper side edges shown in FIG. It is configured to be guided by the positioning member 8.
In FIG. 2, the front end (right end in the figure) of each of the paper feed trays TR <b> 1 to TR <b> 4 is supported by a paper front end support wall 9, and the rear end of the paper transport direction is a paper rear end support wall (not shown). ).

FIG. 3 is an explanatory view of the paper feeding device. FIG. 3A is a view of the paper feeding device excluding the retard roll, feed roll, pickup roll mounting member, and pickup roll of the paper feeding device as viewed obliquely from the upstream side in the sheet conveying direction. 3B is a perspective view of the retard roll unit, FIG. 3C is a perspective view of the feed roll unit, FIG. 3D is a perspective view of the pickup roll mounting member, and FIG. 3E is a perspective view of the pickup roll.
2 and 3, a paper feeding device V (see FIG. 2) is arranged at the upper right of each of the paper feeding trays TR1 to TR4. The sheet feeding device V includes a sheet feeding fixing member V1 and a sheet feeding rotation unit V2 that is rotatable with respect to the sheet feeding fixing member V1. The sheet feeding fixing member V1 includes a rear fixing member V1a arranged at the rear part (-X part), a front fixing member V1b arranged at the front part (X part), the rear fixing member V1a and the front fixing member V1b. It has the intermediate fixing member V1c (refer FIG. 2) to connect.
In FIG. 3, the rear fixing member V1a of the paper feed fixing member V1 has a drive member housing case 11, and inside the drive member housing case 11, a paper feed drive motor M1 and the paper feed A gear train (not shown) rotated by the drive motor M1 is accommodated.

FIG. 4 is a perspective view of the main part of the sheet feeding device shown in FIG. 3 as viewed obliquely from the downstream side in the sheet conveying direction.
Figure 5 is an explanatory view of a pick-up roll mounting member position adjusting device, FIG. 5A is a perspective view, FIG. 5B is a view seen from an arrow VB of FIG 5A, the pickup roller mounting member is non-removal position of the upper (paper takeout FIG. 5C is a view as seen from the arrow VB in FIG. 5A, and is a view corresponding to a state in which the pickup roll mounting member is rotated to the lower sheet take-out position. It is.
6 is an explanatory view of a portion viewed from the arrow VI A- VI A line of FIG. 3, and FIG. 6A is a cross-sectional view of the arrow VI A- VI A line of FIG. 3 with the detachable retard roll removed. 6B is an enlarged sectional view taken along line XI B- XI B in FIG. 6A.
FIG. 7 is an explanatory view of a portion viewed from the arrow V II A-V II A line of FIG. 3. FIG. 7A is a drawing roll unit rotated to a roll attaching / detaching position and a retard roll, a feed roll and a pickup. shows a state before mounting the roll, Figure 7B V II B-V II B line cross-sectional enlarged view of FIG. 7A, FIG. 7C is a V II C-V II C line cross-sectional enlarged view of FIG. 7A .
FIG. 8 is an explanatory view of a portion viewed from the arrow V III A-V III A line of FIG. 3, and FIG. 8A is a diagram illustrating a case where the sheet feeding rotation unit is rotated to the roll attaching / detaching position and the retard roll, feed roll, and pickup. shows a state in which the roll is mounted, FIG. 8B V III B-V III B line cross-sectional enlarged view of FIG. 8A, FIG. 8C is a V III C-V III C line cross-sectional enlarged view of FIG 8A.

The intermediate fixing member V1c disposed between the rear fixing member V1a and the front fixing member V1b has a sheet metal frame 13 (see FIGS. 2, 4, and 6 to 8). A bent portion 13a bent leftward (−Y direction) and downward is formed at the upper end portion of the sheet metal frame 13, and the upper surface of the bent portion 13a is formed as a paper guide surface.
2, 4, and 6 to 8, a pair of brackets 14 and 14 are fixed to the lower portion of the central portion of the sheet metal frame 13 in the front-rear direction (X-axis direction). A pair of front and rear side walls 15 a, 15 a of the retard roll support member 15 are supported by the pair of brackets 14, 14 so as to be rotatable around the retard roll rotation transmission shaft 16. A retard roll mounting portion 15b is formed at the left end (-Y end) of the pair of side walls 15a.

  In FIG. 6 and FIGS. 9C and 9D to be described later, the retard roll mounting portions 15b and 15b include a small-diameter portion insertion groove 15b1 having a narrow width on the outer end side in the axial direction and a small-diameter portion on the axially central side of the small-diameter portion insertion groove 15b1. An insertion groove 15b2 and a large-diameter portion holding hole 15b3 are provided. The small-diameter partial insertion grooves 15b1 and 15b2 have the same width, and the large-diameter partial holding hole 15b3 is a circular hole having a larger diameter than the small-diameter partial insertion grooves 15b1 and 15b2.

In FIG. 4, the retard roll support member 15 is rotatably supported by a retard roll rotation transmission shaft 16 parallel to a straight line connecting the pair of retard roll mounting portions 15 b, 15 b. The rotation transmission gear 16a is attached to an intermediate portion between the pair of retard roll attachment portions 15b and 15b. The retard roll rotation transmission shaft 16 extends rearward (in the −X axis direction) and is connected to the output shaft of the one-way clutch 17. The input shaft 18 of the one-way clutch 17 extends rearward, is attached to the rear end of the input shaft 18, and a gear (not shown) meshes with a gear train inside the drive member housing case 11.
Therefore, when the sheet feeding drive motor M1 in the drive member housing case 11 rotates, the rotation is caused by the retard roll rotation transmission gear 16a via the input shaft 18, the one-way clutch 17, and the retard roll rotation transmission shaft 16. Is transmitted to.

A torsion spring 19 (see FIGS. 4 and 6) is wound around the outer end portion of the retard roll rotation transmission shaft 16, and one outer end portion of the torsion spring 19 is locked to the bracket 14 and the other outer end portion. The portion is locked to the side wall 15 a of the retard roll support member 15. Then, due to the action of the torsion spring 19, the retard roll support member 15 always receives turning force (upward turning force) for moving the retard roll mounting portion 15 b upward. The retard roll support member 15 that receives upward turning force by the action of the torsion spring 19 has a position in which the upper end surfaces of the pair of side walls 15a are in contact with the distal end portions of the bent portions 13a of the sheet metal frame 13 (see FIG. upper limit position is restricted by 6 reference).

9 is an explanatory view of a retard roll mounting portion of the retard roll support member and a retard roll unit that is detachably mounted on the retard roll mounting portion. FIG. 9A is a front view of the retard roll unit, and FIG. 9B is a retard roll unit. FIG. 9C is a diagram showing a state before the retard roll unit is mounted on the retard roll mounting unit, and FIG. 9D is a view from the arrow IX ID in FIG. 9C. FIG. 9E is a diagram showing a state in which the retard roll unit is mounted on the retard roll mounting portion.
In FIG. 9A and FIG. 9B, the axis of the retard roll unit V3 is constituted by an expansion / contraction shaft 20 whose length in the axial direction expands and contracts. The telescopic shaft 20 includes a cylindrical outer shaft 21 having an inner shaft insertion hole 21a, an inner shaft 22 having a pair of inner shaft members 22a and 22a inserted into the inner shaft insertion hole 21a from both ends, and the inner shaft. The coil spring 23 is disposed between the members 22a and 22a.
The inner shaft member 22a has a small-diameter portion 22a1 that forms an outer end in the axial direction, and a large-diameter portion 22a2 that has a cylindrical outer surface at the axially central portion that connects to the small-diameter portion 22a1. The coil spring 23 is disposed between the inner shaft members 22a and 22a in a state where the large diameter portions 22a2 of the pair of inner shaft members 22a are respectively inserted from both ends of the inner shaft insertion hole 21a.

In FIG. 9B, protrusions connected to the coil spring 23 in a fitted state are formed on the inner end portion of the large-diameter portion 22a2 of the inner shaft member 22a, and both ends of the coil spring 23 are connected to the pair of inner members. The shaft member 22a is fitted and connected to the protrusion. Further, a ring-shaped projecting portion having a small inner diameter is formed at the central portion of the inner shaft insertion hole 21a. A pair of inner shaft members 22a connected by the coil springs 23 by the ring-shaped protruding portions 21b are configured not to fall out of the inner shaft insertion holes 21a.
The telescopic shaft 20 is constituted by the elements indicated by the reference numerals 21 to 23. On the surface of the outer shaft 21 of the telescopic shaft 20, a gear (retard roll integrated rotating gear) 24 and a retard roll Rs that rotate integrally with the retard roll Rs are provided. The gear 24 is a gear that meshes with a rotation transmission gear 16a (see FIG. 4) mounted on the retard roll rotation transmission shaft 16.

  As shown in FIG. 9, the length of the telescopic shaft 20 contracts when the telescopic shaft 20 is pressed from both ends. When the telescopic shaft 20 is contracted as shown in FIG. 9C and inserted into the retard roll mounting portions 15b and 15b and then the telescopic shaft 20 is extended, the telescopic shaft 20 is moved as shown in FIGS. 9B and 9E. It can be easily mounted on the retard roll mounting portions 15b, 15b. The telescopic shaft 20 can be easily detached from the retard roll mounting portions 15b, 15b by the reverse operation.

In FIG. 5 , a solenoid 26 is disposed below the rear end (-X end) of the paper feed rotation unit V2. In FIG. 5, the lower end of the case of the solenoid 26 is fixedly supported by a fixing member, and the telescopic shaft 26a of the solenoid 26 extends upward. A plate 27 is connected to the upper end of the telescopic shaft 26a . A compression coil spring 28 is disposed around the telescopic shaft 26 a, and the compression coil spring 28 is compressed between the upper end of the case of the solenoid 26 and the plate 27. The telescopic shaft 26 a receives a force that is always extended by the compression coil spring 28.

3, 7, and 8, the sheet feeding rotation unit V <b> 2 has a sheet metal rotation plate (sheet feeding roll support member) 30. Left ends of both ends in the front-rear direction (X-axis direction) of the rotating plate 30 are supported by the axes V2 a and V2 a so as to be rotatable with respect to the rear fixing member V1a and the front fixing member V1b. The rotating plate 30 is rotatable between a roll attaching / detaching position indicated by a solid line position in FIGS. 7 and 8 and an operation position indicated by a two-dot line (a position where a paper feeding operation is performed). In the operation position indicated by the two-dot chain line of the rotating plate 30, the downward surface (lower surface) is formed as a roll mounting surface on which the feed roll Rk and the pickup roll Rp are mounted. The roll mounting surface is configured to face upward in a state where the roll mounting surface is rotated to the roll attaching / detaching position indicated by the solid line so that the roll attaching / detaching operation can be easily performed.

Figure 10 is a main portion explanatory view of the rotation unit for a paper feed, Fig. 10A is a view seen from an arrow X in FIG. 7, FIG. 10B is a view seen from an arrow X B of FIG 10A, FIG. 10C is a view 10A is arrow X C -X C line cross-sectional view of.
FIG. 11 is an explanatory view of a main part of the paper feeding rotation unit, as viewed from the arrow XI in FIG.
3, 10, and 11, the rotation plate 30 has openings 30 a, 30 b, and 30 c (see FIGS. 3 and 10).
Figure 10, side walls 31 and 32 by bending a portion of the rotating Plate 30 made of sheet metal are formed on both ends in the longitudinal direction (X axis direction) of the opening 30a in FIG. 11. Wherein the rear end of the opening 30b (-X end) is formed with side walls 33, 34 by bending a portion of the rotating Plate 30, side wall 33 is disposed adjacent in parallel to the side walls 31 ing. Wherein the front end of the opening 30c (X end), and the side wall 35 by bending a portion of the rotating Plate 30 is formed, the side walls 35 are disposed adjacent in parallel to the side wall 32.

10 and 11, the side walls 31 and 32 are formed with feed roll mounting large-diameter grooves 31a and 32a, respectively. As shown in FIG. 10B, the feed roll mounting large-diameter grooves 31a and 32a have tapered grooves whose intervals become narrower from the outer end opening toward the inner end large-diameter hole.
The side walls 33 and 35 are formed with feed roll mounting small-diameter grooves 33a and 35a, respectively. As shown in FIG. 10C, the feed roll mounting small-diameter grooves 33a and 35a have tapered grooves whose intervals become narrower from the outer end opening toward the inner end small-diameter groove.
The feed roll mounting large diameter groove 31a and the feed roll mounting small diameter groove 33a form a feed roll mounting portion (31a + 33a) for mounting the front end of the feed roll unit V4 (see FIG. 12 described later). A feed roll mounting portion (32a + 35a) for mounting the rear end of the feed roll unit V4 (see FIG. 12 described later) is formed by the large diameter groove 32a and the feed roller mounting small diameter groove 35a. A feed roll mounting portion (31a + 33a + 32a + 35a) is formed by the elements indicated by the reference numerals 31a, 33a, 32a, and 35a.

  When the rotating plate 30 is rotated to the operation position (the two-dot chain line position in FIGS. 7 and 8) where the sheet feeding operation is performed, the rotating plate 30 faces downward and rotates to the roll attaching / detaching position (solid line position in FIGS. 7 and 8). A pick-up roll mounting member connecting shaft 37 (see FIGS. 4, 5, 10, and 11) formed of a cylindrical shaft is rotatably supported on the roll mounting surface that faces upward in a moved state. A protruding member 37 a (see FIG. 5) that protrudes in the radial direction at the axial end is provided at the rear end of the pickup roll mounting member connecting shaft 37. The front end portion of the pickup roll mounting member connecting shaft 37 constituted by the cylindrical shaft passes through the side wall 32 (see FIGS. 5 and 10) in a rotatable manner. 10 and 11, a torsion spring (elastic member) 38 is mounted on the front end portion of the pickup roll mounting member connecting shaft 37 constituted by the cylindrical shaft. One end of the torsion spring 38 is connected to the pickup roll mounting member connecting shaft 37, and the other end is locked to the roll mounting surface of the rotating plate 30. The torsion spring 38 acts so as to always rotate the protruding member 37a (see FIG. 5) of the pickup roll mounting member connecting shaft 37 downward.

A roll rotation transmission shaft 39 penetrates the pickup roll mounting member connecting shaft 37 constituted by the cylindrical shaft in a rotatable manner. A rotation introducing gear G1 (see FIGS. 3 and 5) is attached to the rear end portion of the roll rotation transmission shaft 39. In the state where the rotation plate 30 is moved to the position shown in FIG. 3 or to the position shown by the two-dot chain line in FIGS. The rotation is introduced by meshing with a gear train (not shown) arranged inside the drive member housing case 11 of V1a.
10 and 11, the front end portion of the roll rotation transmission shaft 39 passes through the pickup roll mounting member connecting shaft 37, and the front end rotates to the side wall 31 via a low friction cylindrical member 40 made of a resin material. It is installed as possible.
The roll rotation transmission shaft 39 is provided with a rotation output gear G2. The rotation output gear G2 meshes with a gear G3 rotatably supported on the side wall 32. Accordingly, the rotation of the rotation introducing gear G1 attached to the rear end of the roll rotation transmission shaft 39 is transmitted to the gear G3 via the roll rotation transmission shaft 39 and the gear G2.

As shown in FIGS. 3 and 10, the pickup roll mounting member V <b> 5 includes a connection plate 41 and a pair of front and rear side walls 42 and 42 provided at both front and rear ends of the connection plate 41. The rear side wall 42 is integrally connected to the front end of the pickup roll mounting member connecting shaft 37, and the front side wall 42 is rotatably supported on the low friction cylindrical member 40. Accordingly, the pair of side walls 42, 42 and the connecting plate 41 is integrally with the pickup roller mounting member connecting shaft 37, Ru Oh rotatable on said roll rotation transmission shaft 39.
Pickup roll mounting portions 42a and 42a are formed on the pair of side walls 42 and 42, respectively. A gear G4 is rotatably mounted on the rear side wall 42, and the gear G4 meshes with the rotation output gear G2 . A light shielding plate 43 is fixed to the front side wall 41.
The pickup roll mounting member V5 is constituted by the elements indicated by the reference numerals 41 to 43 and G4.

6, 10, and 11, a pipe-up roll position sensor SN is fixed to the side wall 34. The pipe-up roll position sensor SN has a light emitting element SN1 and a light receiving element SN2 arranged with a space therebetween. The light shielding plate 43 of the pickup roll mounting member V5 is disposed between the light emitting element SN1 and the light receiving element SN2.
When the pickup roll mounting member connecting shaft 37 formed by the cylindrical shaft rotates on the roll rotation transmission shaft 39, the pickup roll mounting member V5 rotates integrally with the pickup roll mounting member connecting shaft 37. At this time, since the light shielding plate 43 of the pick-up roll mounting member V5 rotates, the amount of light detected by the light receiving element SN2 of the pick-up roll position sensor SN changes. Therefore, the rotation angle of the pick-up roll mounting member V5 can be detected from the amount of light detected by the light receiving element SN2 of the pick-up roll position sensor SN.

FIG. 12 is an explanatory view of the feed roll mounting portion and the feed roll unit that is detachably mounted on the feed roll mounting portion, FIG. 12A is a front view of the feed roll unit, and FIG. 12B is a feed roll mounting portion. It is a longitudinal cross-sectional view of the state mounted | worn to.
In FIG. 12, a feed roll unit V4 that is detachably mounted on the feed roll mounting portion (31a + 33a + 32a + 35a) has a telescopic shaft 40 whose length in the axial direction expands and contracts.
The telescopic shaft 45 is configured in the same manner as the telescopic shaft 20, and detailed description thereof is omitted. Telescopic shaft 45 includes a cylindrical outer shaft 46 having an inner shaft insertion hole 46a, a pair of inner shaft member 47a inserted from opposite ends into said shaft insertion hole 46a, the inner shaft 47 with 47a, the inner shaft The coil spring 48 is disposed between the members 47a and 47a . The inner shaft member 47a has a small-diameter portion (outer end portion of the telescopic shaft 45 ) 47a1 that forms the outer end portion in the axial direction, and a cylindrical outer surface of the axially central side portion that is connected to the small-diameter portion 47a1. A large-diameter portion 47a2 .
A rotatable outer shaft 46 of the telescopic shaft 45 supports a gear (feed roll integrated rotating gear) G5 and a feed roll Rk that rotate integrally with the feed roll Rk. The gear G5 is a gear that meshes with the gear G3 (see FIG. 10).
The attaching / detaching work of the feed roll unit V4 to the feed roll mounting portion (31a + 33a + 32a + 35a) is performed in a state where the rotating plate 30 is rotated to the attaching / detaching work position (roll attaching / detaching position) indicated by the solid line in FIG.

FIG. 13 is an explanatory view of a pickup roll unit that is detachably attached to the pickup roll attachment portion of the pickup roll attachment member, FIG. 13A is a front view of the pickup roll unit, and FIG. 13B is a pickup roll unit attached to the pickup roll attachment portion. It is a longitudinal cross-sectional view of the mounted state.
In FIG. 13, a pickup roll unit V6 that is detachably attached to the pickup roll attachment portions 42a, 42a of the pickup roll attachment member V6 has a telescopic shaft 50 whose length in the axial direction expands and contracts.
Since the telescopic shaft 50 is configured in the same manner as the telescopic shaft 20, a detailed description thereof will be omitted. The telescopic shaft 50 includes a cylindrical outer shaft 51 having an inner shaft insertion hole 51a, an inner shaft 52 having a pair of inner shaft members 52a and 52a inserted into the inner shaft insertion hole 51a from both ends, and the inner shaft member. The coil spring 53 is disposed between 52a and 52a. The inner shaft member 52a has a small-diameter portion (outer end portion of the telescopic shaft 50) 52a1 that forms the outer end portion in the axial direction, and a large cylindrical outer surface that is an axially central portion connected to the small-diameter portion 52a1. And a diameter portion 52a2.
A rotatable outer shaft 51 of the telescopic shaft 50 supports a gear (pickup roll integrated rotating gear) G6 and a pickup roll Rp that rotate integrally with the pickup roll Rp. The gear G6 is a gear that meshes with the gear G4 (see FIGS. 10 and 11). The gears G3 to G6 constitute rotation transmission gears (G3 to G6) that transmit the rotation of the rotation output gear G2 to the feed roll Rk and the pickup roll Rp.
The roll rotation transmission shaft 39 and the rotation transmission gears (G3 to G6) constitute roll rotation force transmission members (39, G1 to G6).
The pick-up roll unit V6 is attached to and detached from the pick-up roll mounting portions 42a and 42a in a state where the rotating plate 30 is rotated to the attaching / detaching position (roll attaching / detaching position) indicated by the solid line in FIG.

(Operation of Example 1)
In the paper feeder of the first embodiment having the above-described configuration, the pickup roll mounting member V5, the pickup roll mounting member connecting shaft 37, the roll rotation transmission shaft 39, and the gears G1 to G4 are disposed on the roll mounting surface of the rotating plate 30. Etc. are mounted.
The retard roll unit V3 is easily attached to the retard roll mounting portions 15b and 15b of the retard roll support member 15 in a state in which the rotating plate 30 is rotated to the roll attaching / detaching work position shown by the solid line in FIGS. Can be attached to.
The feed roll unit V4 is easily attached to and detached from the feed roll mounting portion (31a + 33a + 32a + 35a) of the rotating plate 30 in a state where the rotating plate 30 is rotated to the roll attaching / detaching work position shown by the solid line in FIGS. can do. Further, the pickup roll unit V6 has the pickup roll mounting member V5 mounted on the rotating plate 30 in a state where the rotating plate 30 is rotated to the roll attaching / detaching work position indicated by the solid line in FIGS. It can be easily attached to and detached from the pickup roll mounting portions 42a and 42a.
Accordingly, the retard roll unit V3, the feed roll unit V4, and the pickup roll unit V6 can be replaced individually, and may be replaced according to the life of each roll unit. Therefore, each roll unit can be easily replaced separately at an appropriate time.

In the state shown in FIG. 3 or in the state where the rotating plate 30 is moved to the two-dot chain line position in FIG. 7 (that is, the state where the rotating plate 30 is rotated to the operating position), the rotation introduction attached to the rear end portion of the roll rotation transmission shaft 39. The gear G1 meshes with a gear train (not shown) disposed in the drive member housing case 11 of the rear fixing member V1a. Further, the pickup roll mounting member connecting shaft 37 is constantly receiving a downward rotating force by the torsion spring 38 (see FIG. 10), but the protruding member 37a (see FIG. 5) at the rear end of the pickup roll mounting member connecting shaft 37. The plate 27 that is in contact with the lower surface of the reference 26 is lifted upward by a compression coil spring 28 that acts to constantly extend the telescopic shaft 26a of the solenoid 26. In the state in which the protruding member 37a is lifted upward (the state shown in FIG. 5B), the pickup roll mounting member V5 that rotates integrally with the pickup roll mounting member connecting shaft 37 is also held at the position rotated upward. .

FIG. 14 is a diagram illustrating a state in which the pickup roll mounting member V5 is rotated to the upper non-removing position (a position where the paper is not removed).
FIG. 15 is a view showing a state in which the pickup roll mounting member V5 is rotated to the lower sheet take-out position.
When the solenoid 26 is extended by the compression spring 28 as shown in FIG. 5B and the solenoid 26 is energized in the state where the pickup roll mounting member V5 is rotated upward as shown in FIG. 14, the telescopic rod 26a of the solenoid 26 is supplied. Contracts. When the telescopic rod 26a contracts, the pickup roll mounting member connecting shaft 37 is rotated by the action of a torsion spring 38 (see FIG. 10). At this time, the projecting member 37a and the pickup roll mounting member V5 rotate downward. At this time, the pickup roll mounting member V5 and the pickup roll Rp mounted thereon are in the state shown in FIG.
When the energization of the solenoid 26 is stopped in the state of FIG. 15, the state returns to the state of FIG.

According to the first embodiment, transport rolls (rolls for transporting paper) such as the retard roll Rs, feed roll Rk, and pick-up roll Rp used in the paper feeder can be easily replaced without using a tool. Can do.
In addition, it is possible to prevent occurrence of loss of parts, forgetting assembly, assembly errors, and the like during replacement work of a transport roll (roll for transporting paper) used in the paper feeder.
Further, the replacement work of the retard roll unit V3, the feed roll unit V4, and the pickup roll unit V6 used in the paper feeder can be performed with one hand.

(Example of change)
As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various change is performed within the range of the summary of this invention described in the claim. It is possible. A modified example (H01) of the present invention is exemplified below.
(H01) A non-rotating retard member can be used instead of the rotating retard roll. As the retard member in this case, various conventional retard members that act so as to prevent the lower surface of the sheet conveyed to the contact portion with the feed roll from moving downstream in the sheet conveying direction can be used.

FIG. 1 is an overall explanatory view of an image forming apparatus (tandem digital color copying machine) according to a first embodiment of the present invention. FIG. 2 is an enlarged explanatory view of the main part of FIG. FIG. 3 is an explanatory view of the paper feeding device. FIG. 3A is a view of the paper feeding device excluding the retard roll, feed roll, pickup roll mounting member, and pickup roll of the paper feeding device as viewed obliquely from the upstream side in the sheet conveying direction. 3B is a perspective view of the retard roll unit, FIG. 3C is a perspective view of the feed roll unit, FIG. 3D is a perspective view of the pickup roll mounting member, and FIG. 3E is a perspective view of the pickup roll. FIG. 4 is a perspective view of the main part of the sheet feeding device shown in FIG. Figure 5 is an explanatory view of a pick-up roll mounting member position adjusting device, FIG. 5A is a perspective view, FIG. 5B is a view seen from an arrow VB of FIG 5A, the pickup roller mounting member is non-removal position of the upper (paper takeout FIG. 5C is a view as seen from the arrow VB in FIG. 5A, and is a view corresponding to a state in which the pickup roll mounting member is rotated to the lower sheet take-out position. It is. 6 is an explanatory view of a portion viewed from the arrow VI A- VI A line of FIG. 3, and FIG. 6A is a cross-sectional view of the arrow VI A- VI A line of FIG. 3 with the detachable retard roll removed. 6B is an enlarged sectional view taken along line XI B- XI B in FIG. 6A. FIG. 7 is an explanatory view of a portion viewed from the arrow V II A-V II A line of FIG. 3. FIG. 7A is a drawing roll unit rotated to a roll attaching / detaching position and a retard roll, a feed roll and a pickup. shows a state before mounting the roll, Figure 7B V II B-V II B line cross-sectional enlarged view of FIG. 7A, FIG. 7C is a V II C-V II C line cross-sectional enlarged view of FIG. 7A . FIG. 8 is an explanatory view of the portion viewed from the arrow V III A-V III A line of FIG. 3, and FIG. shows a state in which the roll is mounted, FIG. 8B V III B-V III B line cross-sectional enlarged view of FIG. 8A, FIG. 8C is a V III C-V III C line cross-sectional enlarged view of FIG 8A. 9 is an explanatory view of a retard roll mounting portion of the retard roll support member and a retard roll unit that is detachably mounted on the retard roll mounting portion. FIG. 9A is a front view of the retard roll unit, and FIG. 9B is a retard roll unit. FIG. 9C is a diagram showing a state before the retard roll unit is mounted on the retard roll mounting unit, and FIG. 9D is a view from the arrow IX ID in FIG. 9C. FIG. 9E is a diagram showing a state in which the retard roll unit is mounted on the retard roll mounting portion. Figure 10 is a main portion explanatory view of the rotation unit for a paper feed, Fig. 10A is a view seen from an arrow X in FIG. 7, FIG. 10B is a view seen from an arrow X B of FIG 10A, FIG. 10C is a view 10A is arrow X C -X C line cross-sectional view of. FIG. 11 is an explanatory view of a main part of the paper feeding rotation unit, as viewed from the arrow XI in FIG. FIG. 12 is an explanatory view of the feed roll mounting portion and the feed roll unit that is detachably mounted on the feed roll mounting portion, FIG. 12A is a front view of the feed roll unit, and FIG. 12B is a feed roll mounting portion. It is a longitudinal cross-sectional view of the state mounted | worn to. FIG. 13 is an explanatory view of a pickup roll unit that is detachably attached to the pickup roll attachment portion of the pickup roll attachment member, FIG. 13A is a front view of the pickup roll unit, and FIG. 13B is a pickup roll unit attached to the pickup roll attachment portion. It is a longitudinal cross-sectional view of the mounted state. FIG. 14 is a diagram illustrating a state in which the pickup roll mounting member V5 is rotated to the upper non-removing position (a position where the paper is not removed). FIG. 15 is a view showing a state in which the pickup roll mounting member V5 is rotated to the lower sheet take-out position.

Rp ... Pickup roll,
TR1 to TR4 ... paper feed tray,
V5: Pickup roll mounting member,
30: Roll support member for paper feeding (rotating plate)
37 ... Pickup roll mounting member connecting shaft,
38 ... an elastic member,
39: Roll rotation transmission shaft,
42a ... pickup roll mounting part,
G1 ... rotation introduction gear,
G2: Rotation output gear,
G3 to G6: Rotation transmission gear,
39, G1-G6 ... Roll rotational force transmission member

Claims (5)

A paper feeder provided with the following structural requirements (A01) to (A05),
(A01) It is rotatably supported between an operation position where a paper feeding operation is performed and a roll attaching / detaching position which is rotated upward about a horizontal axis, and is disposed above the paper feed side end of the paper feed tray. A rotation member for paper feed, which has a roll mounting surface that faces downward when rotated to the operating position and faces upward at the roll attaching / detaching position rotated upward; a feed roll on the roll mounting surface side; The paper feed rotation member on which the pickup roll mounting member is rotatably mounted;
(A02) in a state where the rotating member for the sheet feeding is rotated to the operating position, rotatable and pick-up roll is mounted between the upper position rotated downward position and upwardly pivoted downward The pickup roll mounting member,
(A03) an elastic member for applying a rotational force to the pickup roll mounting member so as to always rotate the pickup roll mounting member downward;
(A04) A solenoid having a telescopic rod fixedly supported, and the pickup roll mounting member that receives a force rotating downward by the elastic member when the solenoid is not energized against the force of the elastic member. and a upward movement elastic member acts to move the upper position, the state of being energized to the solenoid, the solenoid regulates the upward movement elastic member, the pickup roll mounting the elastic member pickup roll causes moving member downward mounting member position adjusting device,
(A05) A rotation transmission shaft rotatably supported by the paper feed rotation member, and a rotation introducing gear mounted to one end of the rotation transmission shaft, wherein the paper feed rotation member is in the operating position. The rotation introducing gear to which the rotational force is transmitted from the fixedly arranged gear in a state where the rotation is rotated, the rotation output gear attached to the other end of the rotation transmission shaft, and the rotation of the rotation output gear to the feed roll A roll rotation transmission gear having a feed roll rotation transmission gear for transmission and a pickup roll rotation transmission gear for transmitting the rotation of the rotation output gear to the pickup roll, and having the pickup roll rotation transmission gear different from the feed roll rotation transmission gear Element. The sheet feeding device according to claim 1, comprising the following configuration requirements (A06):
(A06) wherein a pick-up roll mounting member supporting shaft for pickup roll mounting member integrally rotated, the pickup roller mounting member supporting shaft arranged at a position different from the rotation axis of the feed roll. The sheet feeding device according to claim 1 or 2, comprising the following constituent elements (A07) and (A08):
(A07) It has a projecting member that rotates integrally with the pick-up roll mounting member on which the pick-up roll is mounted and projects in the radial direction at the end in the axial direction, and is rotatably supported by the paper-feeding rotating member. A pickup roll mounting member supporting shaft, wherein the pickup roll mounting member is rotated downward and an upper position is rotated upward in a state where the paper feeding rotation member is moved to the operating position. The pick-up roll mounting member support shaft rotatable between
(A08) a solenoid having a telescopic rod fixedly supported, an abutting member connected to a distal end portion of the telescopic rod and contacting a protruding member of the pickup roll mounting member support shaft, and the pickup roll mounting member An elastic member for upward movement that causes the abutting member to abut against the protruding member so as to move to the upper position against the force of the elastic member, and when the solenoid is energized, the elastic member is the pickup roller mounting member the abutment member pick-up roll to move the mounting member position adjusting device in a position for allowing a move downwardly, The sheet feeding device according to claim 3, comprising the following configuration requirements (A09) and (A010):
(A09) The pickup roll mounting member support shaft configured by a cylindrical shaft,
(A010) The rotation transmission shaft that penetrates the inside of a cylindrical shaft constituting the pickup roll mounting member support shaft. An image forming apparatus having the following configuration requirements (A011),
(A011) The sheet feeding device according to any one of claims 1 to 4.

Images