JP6411075B2 - Sheet conveying apparatus, image reading apparatus, and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet conveying apparatus that conveys a sheet, an image reading apparatus that reads a document conveyed by the sheet conveying apparatus, and an image forming apparatus that forms an image read by the image reading apparatus on a sheet.

  An image forming apparatus such as a copying machine, a printer, or a facsimile that forms an image on a sheet reads a document conveyed by an automatic document feeder with an image reading device, and copies an image of the document onto the sheet with an image forming unit. There is something that has become. In this case, the image forming apparatus conveys a document or a sheet by a sheet conveying device. The sheet conveying device conveys a sheet by rotating a roller.

  And it is preferable that the sheet conveying apparatus can replace | exchange the roller used for a long period of time, and there exists a thing of patent document 1 as such a sheet conveying apparatus.

  FIG. 19 is a partial perspective view of a conventional sheet conveying apparatus 901. FIG. 20 is a perspective view of a transport roller unit 903 that is detachably provided on the paper feed cover unit 910 of the sheet transport apparatus of FIG. In the conveyance roller unit 903, a sheet feeding roller 914 and a sheet feeding roller shaft 919 as rotating bodies are detachably connected to a drive transmission shaft (not shown) via a shaft coupling 936.

JP 2011-201656 A

  However, in order to replace the conveyance roller unit 903, the conventional sheet conveyance device 901 requires two steps of turning the removal lever 930 and releasing the fitting between the conveyance roller unit 903 and the paper feed cover unit 910. there were. For this reason, the conventional sheet conveying apparatus 901 requires time and labor for replacing the conveying roller unit 903. In addition, when the transport roller unit 903 cannot be accurately mounted on the paper feed cover unit 910, the sheet may not be transported.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet conveying apparatus that can easily replace a rotating body.

The sheet conveying apparatus of the present invention includes a first supporting unit that rotatably supports a rotating body that conveys a sheet, a second supporting unit that removably supports the first supporting unit , The rotary shaft is movable in the extending direction, and the first support means is biased in a direction toward the rotating body in a state where the first support means is mounted on the second support means, and the first support means is Transmission means for engaging with the rotary shaft so as to be able to transmit drive to the rotary shaft of the rotating body in a state of being mounted on the second support means, provided on the first support means, support means, when being mounted to said second support means in a direction intersecting a direction in which the rotary shaft extends, before said transmission means is engaged with said rotary shaft, said transmission means the transmission means It provided so as to press in a direction against the biasing A swash unit, equipped with, it is characterized in that.

  The sheet conveying apparatus of the present invention can easily replace the rotating body.

1 is a schematic cross-sectional view along a sheet conveying direction of a copying machine as an image forming apparatus according to an embodiment of the present invention. FIG. 5 is a diagram illustrating that the apparatus main body of an automatic document feeder 1C as a sheet conveying apparatus according to an embodiment of the present invention can be opened and closed by a sheet feed cover unit. In FIG. 2, the paper feed cover unit is opened at the position of the broken line, and is a view seen from the direction of the arrow Q. In FIG. 2, it is the figure which looked at the paper feed cover unit from the arrow Q direction, and is a perspective view of the paper feed cover unit when the transport roller unit is attached to and detached from the paper feed cover. FIG. 3 is a perspective view of the paper feed cover unit when the transport roller unit is farther from the paper feed cover than in the case of FIG. 2. FIG. 4 is a perspective view of the paper feed cover unit with the transport roller unit removed in FIG. 3. FIG. 4 is an enlarged view of a conveyance roller unit in FIG. 3. FIG. 6 is a perspective view of the transport roller unit when the paper feed roller shaft of the transport roller unit is mounted on the coupling. FIG. 6 is a partially enlarged perspective view of a shaft gripping portion that supports one end of a paper feed roller shaft of a transport roller unit. It is a VV arrow line view of FIG. FIG. 7 is a cross-sectional view taken along the line U-U in FIG. 6. It is the figure which looked at the conveyance roller unit of FIG. 7 from the arrow X direction. FIG. 13 is a diagram in which a separation arm of the conveyance roller unit in FIG. 12 is bent in the direction of arrow L. It is a YY arrow sectional drawing of FIG. FIG. 4 is an enlarged view of the transport roller unit in FIG. 3. FIG. 6 is a diagram illustrating a state in the middle of mounting the transport roller unit to the paper feed cover unit using the guide surface of the transport roller unit. FIG. 6 is a diagram illustrating a state in the middle of mounting the transport roller unit to the paper feed cover unit using the guide surface of the transport roller unit. FIG. 6 is a diagram when the transport roller unit is mounted on the paper feed cover unit using the guide surface of the transport roller unit. It is a fragmentary perspective view of the conventional sheet conveying apparatus. FIG. 20 is a perspective view of a transport roller unit that is detachably provided on a paper feed cover unit of the sheet transport apparatus of FIG. 19.

  Hereinafter, an automatic document feeder as a sheet conveying apparatus according to an embodiment of the present invention, an image reading apparatus including the automatic document feeder, and a copying machine as an image forming apparatus including the image reading apparatus in an apparatus main body are provided. explain. FIG. 1 is a schematic cross-sectional view along the sheet conveying direction of a copying machine 1 as an image forming apparatus according to an embodiment of the present invention.

  The copier 1 includes an apparatus main body 1A, an image reading apparatus 1B provided on the upper part of the apparatus main body 1A, and an automatic document feeder (ADF) 1C provided on the upper part of the image reading apparatus 1B. It is designed to be copied on a sheet. In addition to the copying machine, the image forming apparatus includes a printer (electrophotographic laser beam printer), a facsimile machine, a complex machine thereof, and the like, and is not limited to the copying machine.

  The automatic document feeder 1C conveys the document D placed on the document placing tray 46 one by one to the image reading unit 15 of the image reading device 1B and discharges it to the document discharge tray 47. The image reading apparatus 1B is configured to read a document conveyed to the image reading unit 15 by the automatic document feeder 1C by the image reading unit 15 and transmit image reading information of the read document to the apparatus main body 1A. In the apparatus main body 1A, a toner image is formed on the sheet S by the image forming unit 11 based on the image information from the image reading apparatus 1B, and the toner image is fixed by the fixing device 14.

  The image forming unit 11 is disposed below the image reading apparatus 1B. The image forming unit 11 is formed by the following components and the like. A photosensitive drum 18 on which a toner image is formed. A laser scanner unit 19 that forms an electrostatic latent image by irradiating the photosensitive drum 18 with laser light. A developing unit 20 that visualizes the electrostatic latent image formed on the photosensitive drum 18 as a toner image. A transfer roller 13 for transferring the visualized toner image to the sheet S; A fixing unit 14 for fixing the transferred toner image; The fixing device 14 includes a fixing roller 22 that incorporates a heater and heats the sheet, and a pressure roller 23 that presses the sheet against the fixing roller 22.

  The sheet feeding unit 12 is disposed at the lower part of the apparatus main body 1A, and separates and feeds a feeding cassette 3 that stacks and stores sheets S, and a sheet that is stored in the feeding cassette 3. Unit 21.

  When the image forming job is started, the control unit 4 causes the automatic document feeder 1C to convey the document, causes the image reading device 1B to read the document, and causes the laser scanner unit 19 to transmit an image data signal. The laser scanner unit 19 irradiates the surface of the photosensitive drum 18 with laser light according to the image data signal. The surface of the photosensitive drum 18 that is uniformly charged to a predetermined polarity potential is exposed by laser light, and an electrostatic latent image is formed on the surface of the photosensitive drum 18. The electrostatic latent image is developed with toner by the developing device 20 to become a toner image and visualized.

  In parallel with the toner image forming operation, the sheets S stored in the feeding cassette 3 are separated one by one by the separation feeding unit 21 and conveyed from the feeding cassette 3 to the conveying roller pair 26. The conveyance roller pair 26 conveys the sheet to the registration roller pair 27. The registration roller pair 27 conveys the sheet between the photosensitive drum 18 and the transfer roller 13 at a predetermined timing. The transfer roller 13 transfers the toner image formed on the photosensitive drum 18 to the sheet S by the transfer bias applied to the transfer roller 13.

  The photosensitive drum 18 and the transfer roller 13 convey the sheet S on which the toner image is transferred to the fixing device 14. The fixing roller 22 and the pressure roller 23 heat and press the sheet to fix the toner image on the sheet. Thereafter, the sheet S on which the image has been fixed is discharged to a discharge tray 25 by a discharge roller pair 24 provided downstream of the fixing device 14. This completes the image forming job.

  When forming images on both sides of the sheet S, the control unit 4 sets the discharge roller pair 24 before discharging the sheet, on which the toner image has been fixed by the fixing device 14, to the discharge tray 25 by the discharge roller pair 24. The sheet S is rotated in the reverse direction and is conveyed to the duplex conveying path 28. The double-sided conveyance path 28 reversely guides the sheet S. Thereafter, a plurality of conveyance roller pairs 29 provided in the double-sided conveyance path 28 re-conveys the sheet to the image forming unit 11. The image forming unit 11 transfers the toner image to the other surface, and the fixing device 14 fixes the toner image on the sheet. Finally, the discharge roller pair 24 discharges the sheet on which the toner image is formed on both sides to the discharge tray 25.

  Next, an automatic document feeder 1C as a sheet conveying apparatus according to an embodiment of the present invention will be described.

  FIG. 2 is a diagram illustrating that the apparatus main body 41 of the automatic document feeder 1C as the sheet conveying apparatus according to the embodiment of the present invention can be opened and closed by the sheet feed cover unit 42. The paper feed cover unit 42 is provided on the apparatus main body 41 of the document feeder 1C so as to be opened and closed in the directions of arrows F and E. The paper feed cover unit 42 can open and close the upstream end portion 42b with the downstream end portion 42a in the document conveyance direction C as a rotation center. The paper feed cover unit 42 includes a paper feed cover 52, a transport roller unit 48 provided on the lower surface of the paper feed cover 52, and an upper roller of the registration roller pair 61.

  FIG. 3 is a view of the sheet feeding cover unit 42 shown in FIG. 4 is a view of the paper feed cover unit 42 as viewed from the direction of the arrow Q in FIG. 2, and is a perspective view of the paper feed cover unit 42 when the transport roller unit 48 is attached to and detached from the paper feed cover 52. FIG. 5 is a perspective view of the paper feed cover unit 42 when the transport roller unit 48 is farther from the paper feed cover 52 than in the case of FIG. 4. FIG. 6 is a perspective view of the paper feed cover unit 42 from which the transport roller unit 48 is removed in FIG. FIG. 7 is an enlarged view of the transport roller unit 48 in FIG. FIG. 8 is a perspective view of the transport roller unit 48 when the paper feed roller shaft 56 of the transport roller unit 48 is attached to the coupling 54.

The transport roller unit 48 is rotatably supported by a paper feed cover 52 as second support means. In FIG. 6, the paper feed cover 52 is provided with a shaft gripping portion 53 as a first bearing, a bearing retaining piece 58, and a coupling 54 as a second bearing and transmission means . The transport roller unit 48 has one of the paper feed roller shafts 56 of the paper feed roller 44 attached to the shaft gripping portion 53 and the bearing retaining piece 58 via the bearing member 77, and the other attached to the coupling 54. Is supported by rotation.

  The transport roller unit 48 (FIG. 7) is formed by a holder member 71 as first support means, a paper feed roller 44 and a pickup roller 43 that are rotatably provided on the holder member 71, and the like. The paper feed roller 44 is provided on the paper feed roller shaft 56. The paper feed roller 44 and the paper feed roller shaft 56 form a rotating body. The sheet feeding roller shaft 56 is rotatably supported by a bearing 71b which is provided in a C shape on the holder member 71 (FIG. 8) and has elasticity. Since the bearing 71b is formed in a C shape and has elasticity, the paper feed roller shaft 56 can be attached to and detached from the bearing 71b, and the paper feed roller 44 can be replaced together with the transport roller unit 48. It has become.

  The paper feed roller 44 is provided on the paper feed roller shaft 56 via a first one-way rotation clutch (not shown). When the paper feed roller shaft 56 rotates in the direction of arrow E, the paper feed roller 44 rotates in the direction of arrow E via a first one-way rotation clutch (not shown). Further, when the paper feed roller shaft 56 stops rotating, the paper feed roller 44 is independently rotated in the arrow E direction by the first one-way rotation clutch, but is not rotated in the arrow F direction. It has become.

  The feed roller shaft 56 is provided with a driving rotator 76 via a second one-way rotation clutch (not shown). When the paper feed roller shaft 56 rotates in the direction of arrow E, the drive rotator 76 rotates in the direction of arrow E via a second one-way rotation clutch (not shown). Further, the drive rotator 76 is rotated in the arrow E direction by the second one-way rotation clutch when the paper feed roller shaft 56 is not rotating, but is not rotated in the arrow F direction. It has become.

  Further, a pickup arm F74 and a pickup arm R75 are rotatably provided on the paper feed roller shaft 56. The pickup arm F74 and the pickup arm R75 and the paper feed roller shaft 56 are connected in a rotating direction by a winding spring (not shown) loosely fitted to the paper feed roller shaft 56. The pickup arm F74 and the pickup arm R75 rotate easily in the direction of arrow E by a winding spring (not shown) with respect to the paper feed roller shaft 56 that has stopped rotating, but in the direction of arrow F, the winding spring It is difficult to rotate.

  A pickup roller shaft 80 is rotatably provided at the rotation end of the pickup arm F74 and the pickup arm R75. The pickup roller shaft 80 is integrally provided with a pickup roller 43 including two rollers 43a and 43b and a driven gear 79. The driven gear 79 is rotated by receiving a rotational force from the drive rotator 76 by a drive gear 81 provided on the pickup arm R75 and a gear train (not shown). The holder member 71 is provided with a pair of shutters 73 that are rotatable in the document transport direction C. The shutter 73 receives the leading edge of the document placed on the document placement tray 46 when the paper feed cover 52 is closed in the E direction.

  Next, an operation in which the automatic document feeder 1C feeds a document with the transport roller unit 48 mounted on the paper feed cover unit 42 will be described. When the apparatus main body 41 of the automatic document feeder is closed by the paper feed cover 52, the pickup arm F74 and the pickup arm R75 are moved from the state shown in FIG. It has fallen in the E direction. Therefore, as indicated by the solid line in FIG. 2, the pickup roller 43 is in pressure contact with the uppermost document among the documents D placed on the document placing tray 46 by its own weight. Further, the paper feed roller 44 is in pressure contact with the separation roller 45. The driven gear 84 (FIG. 3) meshes with a drive gear (not shown).

  In this state, when a drive gear (not shown) meshed with the driven gear 84 rotates, the driven gear 84 rotates in the direction of arrow E, and the paper feed roller shaft 56 also rotates in the direction of arrow E via the coupling 54. Then, the paper feed roller 44 attached to the paper feed roller shaft 56 via a first one-way rotation clutch (not shown) rotates in the direction of arrow E and is attached via a second one-way rotation clutch (not shown). The driven rotator 76 also rotates in the direction of arrow E. The rotation of the drive rotator 76 is transmitted to the driven gear 79 via a gear train (not shown), and the pickup roller 43 also rotates in the direction of arrow E.

  The pickup roller 43 conveys the uppermost document D in the document conveying direction (direction of arrow C in FIG. 2) while rotating in the direction of arrow E, and feeds it between the paper feed roller 44 and the separation roller 45. The document is conveyed in the document conveyance direction C by the drive rotation of the paper feed roller 44 in the E direction and the follow-up rotation of the separation roller 45 via the document, and is conveyed to the image reading unit 15 of the image reading apparatus 1B. The paper is discharged to the document discharge tray 47 by the discharge roller pair 62. When the document passes through the image reading unit 15, the image is read by the image reading unit 15. When two or more originals are fed from the pickup roller 43 (during double feeding), the separation roller 45 stops following the paper feed roller 44 so that only the uppermost document is conveyed by the paper feed roller 44. The document D that has been double fed is separated and conveyed.

(Description of the configuration relating to the attachment and detachment of the transport roller unit)
Next, it will be described that the transport roller unit 48 is detachably provided on the paper feed cover unit 42.

  FIG. 9 is a partially enlarged perspective view of the shaft gripping portion 53 that supports one end of the paper feed roller shaft 56 of the transport roller unit 48. FIG. 10 is a VV arrow view of FIG. 6, 9, and 10, the paper feed cover 52 is provided with a bearing member 77 provided at one end (the left end in FIGS. 7 and 8) of the both ends of the paper feed roller shaft 56. A shaft gripping portion 53 that is detachably supported and a bearing retaining piece 58 are projected. The shaft gripping portion 53 is formed by a pair of shaft gripping pieces 53a and 53b having elasticity. The shaft gripping pieces 53 a and 53 b are formed with arcuate surfaces 53 aa and 53 ba for gripping the bearing member 77 provided on the paper feed roller shaft 56. The bearing receiving piece 58 is formed with a receiving surface 58 a for receiving the bearing member 77. The arc surfaces 53aa, 53ba and the receiving surface 58a form an arc surface along the outer periphery of the bearing member 77 as shown in FIG.

  The paper feed cover 52 is a resin molded product, and the shaft gripping portion 53 and the bearing retaining piece 58 are integrally formed. For this reason, the pair of shaft gripping pieces 53a and 53b has elasticity. When the bearing member 77 is pushed in, the shaft gripping portion 53 grips the bearing member 77 with the arcuate surfaces 53aa and 53ba after the shaft gripping pieces 53a and 53b are elastically deformed and opened once. At this time, the bearing receiving piece 58 receives the bearing member 77 with the receiving surface 58a. Therefore, one end of the paper feed roller shaft 56 is gripped by the shaft gripping portion 53 via the bearing member 77, and the bearing stopper piece 58 is positioned. That is, the shaft gripping portion 53 and the bearing retaining piece 58 support the paper feed roller 44 and the paper feed roller shaft 56 so as to be movable in the direction of the rotation axis, and are detachable in a direction intersecting the rotation axis. It comes to support.

  The other end portion (the right end portion in FIGS. 7 and 8) of the paper feed roller shaft 56 is attached to and detached from the coupling 54, and a spring pin 78 that engages the coupling 54 in the rotational direction is a shaft. They are provided orthogonally.

  11 is a cross-sectional view taken along the line U-U in FIG. 6, and is a cross-sectional view along the axial direction of the coupling 54. The drive connecting shaft 85 is rotatably supported by the paper feed cover 52 by bearings 86 and 87 and is restricted from moving in the axial direction (thrust direction) by the E ring 83. The coupling 54 is loosely fitted to the drive connecting shaft 85 so that a thrust direction L, between a parallel pin 89 provided orthogonal to the drive connecting shaft 85 and an E ring 83 attached to the drive connecting shaft 85 is provided. M is movably provided. Further, when the paper feed roller shaft 56 (FIGS. 7 and 8) is not mounted, the coupling 54 is connected to the drive connecting shaft 85 by a compression spring 88 provided between the coupling 54 and the E ring 83. It is biased toward the end side (left end portion in FIG. 11) and is received by the parallel pin 89. The coupling 54 is partially formed in a cylindrical shape so as to accommodate a part of the compression spring 88 and the parallel pin 89. The coupling 54 is driven to rotate in the same direction even through the drive connecting shaft 85 when the driven gear 84 meshes with a drive gear (not shown), and the paper feed roller via the spring pin 78 of the paper feed roller shaft 56. A rotational force in the same direction is transmitted to the shaft 56.

  12 is a view of the transport roller unit 48 of FIG. 7 as viewed from the direction of the arrow X. FIG. 13 is a view in which the separation arm 72 of the transport roller unit 48 of FIG. 12 is bent in the arrow L direction. As shown in FIGS. 7, 8, 12, and 13, a separation arm 72 as an elastic means that can be elastically deformed is provided on the side of the holder member 71 on the bearing member 77 side of the paper feed roller shaft 56. ing. For this reason, the separation arm 72 is elastically deformed in the direction L (FIG. 13) approaching the holder member 71 and the direction M (FIG. 12) returning from the approached state with the base end portion 72b as the center. It is supposed to be. Further, the separation arm 72 is provided with a protrusion 72 a (FIG. 8) that protrudes toward the bearing member 77 of the paper feed roller shaft 56. Further, the separation arm 72 is located in the vicinity of the shaft gripping portion 53 in a state where the transport roller unit 48 is incorporated in the paper feed cover 52. Since the holder member 71 is a resin molded product, the holder member 71 and the separation arm 72 are integrally formed.

  The operation of attaching / detaching the transport roller unit 48 to / from the paper feed cover 52 in the above configuration will be described.

  First, the operation of mounting the transport roller unit 48 on the paper feed cover unit 42 will be described. Thereafter, an operation of removing the transport roller unit 48 attached to the paper feed cover unit 42 will be described.

  The mounting is performed in the order shown in FIGS. 6, 5, 4, and 3. 7, 8, and 12, when the service person grips the separation arm 72 and the sandwiched portion 71 c of the transport roller unit 48, the separation arm 72 is elastically deformed in the direction of the arrow L as shown in FIG. 13. To do. In this state, the conveyance roller unit 48 is brought close to the paper feed cover 52 to which the conveyance roller unit 48 of FIG. 6 is not attached. Then, the right end of the paper feed roller shaft 56 shown in FIGS. 5 and 8 is inserted into the coupling 54. FIG. 4 shows the inserted state. A spring pin 78 provided at the right end of the paper feed roller shaft 56 engages with the coupling 54 in the rotational direction (rotation can be transmitted). The right end of the paper feed roller shaft 56 presses the coupling 54 against the compression spring 88 shown in FIG.

  After that, the conveying roller unit 48 is moved from the state shown in FIG. Push between. As shown in FIG. 10, the bearing member 77 is sandwiched between the circular arc surfaces 53 aa and 53 ba of the shaft gripping pieces 53 a and 53 b and is received by the receiving surface 58 a of the bearing holding piece 58. As a result, the paper feed roller shaft 56 is supported by the coupling 54 and the shaft gripping portion 53, and the transport roller unit 48 is attached to the paper feed cover unit 42.

  When the transport roller unit 48 is attached to the paper feed cover 52, the protrusion 72a of the separation arm 72 faces the stepped portion 57a as the engaged portion of the paper feed transport guide 57 to be engaged and disengaged. When the person in charge of service releases the finger holding the transport roller unit 48, the separation arm 72 returns to the original direction in the direction of the arrow M and engages with the paper feed transport guide 57. That is, as shown in FIGS. 14 and 15, the protrusion 72a and the stepped portion 57a are engaged. 14 is a cross-sectional view taken along line YY in FIG. FIG. 15 is an enlarged view of the transport roller unit 48 of FIG. With the configuration described above, even if the paper feed cover 52 is opened and closed between the solid line and the broken line in FIG. 2, the transport roller unit 48 is prevented from falling off the paper feed cover 52. In particular, the protrusion 72 a and the stepped portion 57 a are engaged to prevent the transport roller unit 48 from being detached from the paper feed cover 52 due to an impact generated when the apparatus main body 41 is closed by the paper feed cover 52. be able to.

  To remove the transport roller unit 48 from the paper feed cover unit 42, an operation opposite to the mounting operation may be performed. Removal is performed in the order shown in FIGS. 3, 13, 4, 5, and 6. First, the person in charge of service sandwiches the separation arm 72 and the sandwiched portion 71 c with a finger, elastically deforms the separation arm 72 in the direction of the arrow L, and moves the protrusion 72 a of the separation arm 72 to the stepped portion of the paper feed conveyance guide 57. Remove from 57a. At this time, since there is a space for inserting a finger at a position where the elastically deforming end 72c as a gripping means for the sandwiched portion 71c and the separation arm 72 is provided, the service person is in the sandwiched portion 71c and the separation arm 72. It is easy to hang your fingers. In this state, the bearing member 77 of the paper feed roller shaft 56 is separated from the paper feed cover 52, and the bearing member 77 is removed from the shaft gripping portion 53. That is, the engagement between the stepped portion 57a and the protruding portion 72a is released. Then, the transport roller unit 48 is moved away from the coupling 54, and the spring pin 78 of the paper feed roller shaft 56 is removed from the coupling 54. As a result, the transport roller unit 48 is removed from the paper feed cover 52.

  In the above description, even if the coupling 54 is provided on the paper feed roller shaft 56 and the drive connecting shaft 85 is provided with the spring pin 78, the transport roller unit 48 can be attached to and detached from the paper feed cover 52. Therefore, the shaft on which the coupling 54 is provided is not limited to the drive connecting shaft 85. Further, the shaft on which the spring pin 78 is also provided is not limited to the paper feed roller shaft 56.

As shown in FIGS. 12 and 13, an inclined guide surface 71 a (inclined portion) is formed on the opposite side of the holder member 71 where the separation arm 72 is provided. The guide surface 71a abuts on the coupling 54 when the transport roller unit 48 is attached to the paper feed cover unit 42, and moves the coupling 54 in the direction of arrow L in FIG.

  Therefore, when the person in charge of the service attaches the transport roller unit 48 to the paper feed cover 52, the separation arm 72 and the sandwiched portion 71c are sandwiched, and the transport roller unit 48 is moved in the arrow K direction with respect to the paper feed cover 52. (FIG. 16). FIG. 16 is a view in the middle of mounting the transport roller unit 48 to the paper feed cover unit 42 using the guide surface 71 a of the transport roller unit 48. In this case, in FIG. 16, it is assumed that the separating arm 72 is bent in the direction of the arrow L as shown in FIG.

  FIG. 17 is a view in the middle of mounting the transport roller unit 48 to the paper feed cover unit 42 using the guide surface 71 a of the transport roller unit 48. When the transport roller unit 48 is translated in the direction of arrow K, as shown in FIG. 17, the guide surface 71a as a pressing portion moves while pushing the coupling 54 against the compression spring 88 in the direction of arrow L. Also in FIG. 17, it is assumed that the separating arm 72 is bent in the direction of the arrow L as shown in FIG.

  Thereafter, when the end portion of the paper feed roller shaft 56 faces the coupling 54, the coupling 54 is pushed back by the compression spring 88 in the direction of arrow M as shown in FIG. 18 and attached to the paper feed roller shaft 56. . At this time, the protrusion 72 a of the separation arm 72 is located at a position where it can engage with the stepped portion 57 a of the paper feed guide 57. Finally, when the separation arm 72 held by the service person separates the held portion 71 c, the protrusion 72 a of the separation arm 72 engages with the stepped portion 57 a of the paper feed conveyance guide 57. As a result, the transport roller unit 48 is attached to the paper feed cover 52 as shown in FIG.

  The conveyance roller unit 48 described above can be applied to other roller shafts in the automatic document feeder 1C and the roller shaft in the apparatus main body 1A of the copying machine 1, and the roller shaft can be easily attached and detached. Can do. In this case, the paper feed roller shaft 56 is not provided with the pickup arm F74 and the pickup arm R75.

  1: copier (image forming apparatus), 1A: apparatus main body of image forming apparatus, 1B: image reading apparatus, 1C: automatic document feeder (ADF, sheet conveying apparatus), 11: image forming section, 15: image reading section 41: automatic document feeder main body, 42: paper feed cover unit, 43: pickup roller, 44: paper feed roller (rotary member), 48: transport roller unit, 52: paper feed cover (second support means) ), 53: Shaft gripping portion (first bearing), 54: Coupling (second bearing), 56: Feed roller shaft (rotating body), 57a: Step portion (engaged portion), 71: Holder Member (first supporting means), 71a: guide surface (pressing part), 72: separating arm (elastic means), 72a: protrusion (engaging part), 72c: elastic deformation end part (gripping means), 74: Pickup arm F, 75: Pickup arm , 76: drive rotor, 88: compression spring (biasing member), 89: parallel pin, S: sheet, D: document.

Claims (10)

First support means for rotatably supporting a rotating body that conveys the sheet;
Second support means for detachably supporting the first support means;
The rotating body is movable in the direction in which the rotating shaft extends, and the first support means is biased in the direction toward the rotating body in a state of being mounted on the second support means, and the first support means A transmission means that engages with the rotary shaft so that the drive means can be transmitted to the rotary shaft of the rotating body in a state in which the support means is mounted on the second support means;
When the first support means is attached to the second support means in a direction crossing the direction in which the rotation shaft extends , the transmission means is engaged with the rotation shaft. Before the transmission means, the transmission means comprises an inclined portion provided to press the transmission means in a direction against the biasing ,
A sheet conveying apparatus. The inclined portion moves the first support means in an intersecting direction intersecting the direction in which the rotating shaft of the rotating body extends and is attached to the second support means when the inclined portion is attached to the transmitting means. Is converted into a force in a direction in which the transmission means resists the biasing .
The sheet conveying apparatus according to claim 1. An engaging portion provided in the first support means;
An engaged portion provided on the second support means and engaged with the engaging portion;
The first support means is provided and grasped to release the engagement between the engagement portion and the engaged portion, and the first support means is integrated with the rotating body to the second body. A gripping means for removing from the support means,
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. An elastic means that elastically deforms when the gripping means is gripped and releases the engagement between the engaging portion and the engaged portion;
The sheet conveying apparatus according to claim 3. The second support means includes a first bearing that supports one end of the rotating shaft of the rotating body, and a second bearing that supports the other end of the rotating shaft,
The first bearing detachably supports the rotating body in a direction intersecting the axis of the rotating shaft,
The second bearing is the transmission means.
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. The first bearing is elastically deformable so as to removably support one end of the rotating shaft.
The sheet conveying apparatus according to claim 5. The transmission means is driven to the rotating shaft so that when the first supporting means is attached to the second supporting means, the pressing by the inclined portion is released and the sheet can be conveyed by the rotating body. Engaging with the end of the rotating shaft so as to be able to transmit,
The sheet conveying apparatus according to claim 1, wherein the sheet conveying apparatus is a sheet conveying apparatus. A sheet conveying device according to any one of claims 1 to 7,
An image reading unit for reading a document conveyed by the sheet conveying device,
An image reading apparatus. An image reading apparatus according to claim 8,
An image forming unit that forms an image on a sheet based on image information read by the image reading device,
An image forming apparatus. A sheet conveying device according to any one of claims 1 to 7,
An image forming unit that forms an image on a sheet conveyed by the sheet conveying device;
An image forming apparatus.

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