JP5858332B2 - Paper processing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet processing apparatus that performs predetermined processing on a sheet, and an image forming apparatus including the sheet processing apparatus.

  2. Description of the Related Art Conventionally, an image forming apparatus that includes a sheet processing apparatus that performs a binding process or the like on a sheet on which an image is formed by an image forming unit is known. In this sheet processing apparatus, a plurality of sheets are stacked on a sheet stacking surface of a staple tray to form a sheet bundle, and a rear end of the sheet bundle in the sheet conveyance direction (hereinafter referred to as a sheet rear end) is a rear end aligning member. The sheet bundle is aligned with the trailing edge reference fence so as to be aligned. Also, a pair of jogger fences as width direction aligning means are provided on both sides of the sheet width direction above the staple tray. Then, the jogger fence is moved so as to approach each other in the paper width direction from the standby position where it waits with a gap larger than the paper width, and the paper bundles stacked on the staple tray are aligned in the paper width direction. . In this way, the stapler, which is a binding processing unit, drives the needle into a predetermined position of the sheet bundle in which the sheet conveyance direction and the sheet width direction are aligned, so that the sheet bundle is bound.

  However, if the sheets in the sheet bundle stacked on the sheet stacking surface of the staple tray stick to each other and stick to each other, even if the sheet bundle is aligned, each sheet in the sheet bundle is affected by the friction between the sheets. It becomes difficult to move. Therefore, even if the paper bundle loaded on the paper stacking surface of the staple tray is simply abutted against the rear end reference fence to align the paper bundle in the paper conveyance direction, high alignment accuracy of the paper bundle in the paper conveyance direction is achieved. The problem that cannot be obtained occurs.

  In the paper post-processing apparatus described in Patent Document 1, the jogger fence is moved inward in the paper width direction to the extent that the paper bundle on the paper tray is bent, and the paper bundle is aligned in the paper width direction. By deflecting the sheet bundle in this way and aligning the sheet bundle in the sheet width direction, a gap is formed between the sheets and the sheets are prevented from sticking to each other, thereby reducing the influence of friction between the sheets. Thus, each sheet can be easily moved, and high alignment accuracy of the sheet bundle in the sheet width direction is obtained.

  However, in the paper processing apparatus described in Patent Document 1, after the paper bundle is bent and the paper bundle is aligned in the paper width direction, the paper bundle is stopped from being bent, and then the rear end of the paper bundle is moved to the rear end. The sheet bundle is aligned against the reference fence in the sheet conveyance direction. Therefore, when aligning the sheet bundle in the sheet conveyance direction, the sheets are in close contact with each other, and therefore, the sheets are hardly moved in the sheet bundle due to the influence of friction between the sheets. For this reason, even if the trailing edge of the sheet bundle is abutted against the trailing edge reference fence to align the sheet bundle in the sheet conveying direction, there is a sheet in the sheet bundle that does not strike the trailing edge reference fence. Therefore, it is not possible to obtain high alignment accuracy in the sheet conveyance direction of the sheet bundle.

  The present invention has been made in view of the above problems, and an object thereof is to provide a sheet processing apparatus capable of obtaining high alignment accuracy in a sheet transport direction of a sheet bundle and an image forming apparatus including the sheet processing apparatus. It is to be.

In order to achieve the above object, a first aspect of the present invention is a paper transporting means for transporting paper, and a paper tray for stacking a plurality of paper transported by the paper transporting means on a paper stacking surface and stacking them as a paper bundle. A trailing edge aligning member that abuts the trailing edge of the sheet loaded in the sheet tray in the sheet conveying direction and aligns the trailing edge of the sheet in the sheet conveying direction, and the sheet width direction of the sheet loaded in the sheet tray A sheet processing apparatus having a width direction aligning unit that sandwiches both ends and aligns both ends of the sheet in the sheet width direction, and the sheet stacking surface of the sheet tray has a trailing end of the sheet stacked on the sheet stacking surface below The width direction aligning means is movable in the paper transport direction, and the width direction aligning means deflects the sheet bundle loaded on the paper tray. Paper bundle Sandwiched therebetween is held, after lifting upward along the the paper stack on the paper loading surface in the width direction aligning means, the paper stacking the paper bundle to release the holding of the paper bundle by the width direction aligning means is dropped along the surface, it is characterized in that it has a control means for controlling abutting the rear end of the paper bundle in the rear-end aligning member.

  In the present invention, the rear end and the rear end alignment member of the sheet bundle can be brought into contact with each other in a state where the sheet bundle is bent to form a gap between the sheets and prevent the sheets from sticking to each other. This reduces the effect of friction between the paper sheets than when the paper sheets in the paper bundle are in close contact with each other, and makes it easier for each paper sheet to move in the paper bundle. Thus, it is possible to align the sheet conveyance direction of the sheet bundle with higher alignment accuracy than when aligning the sheet bundle in the sheet conveyance direction.

  As described above, according to the present invention, there is an excellent effect that it is possible to obtain a high alignment accuracy of the sheet bundle in the sheet conveyance direction.

6 is a flowchart of sheet bundle alignment control. 1 is a schematic configuration diagram of an image forming apparatus including a post-processing device and an image forming unit. The schematic block diagram of the binding process tray part seen from the loading surface side. The perspective explanatory drawing of a binding process tray part and its attachment mechanism. FIG. 9 is an explanatory perspective view illustrating a paper bundle discharging operation by the discharge belt. FIG. 6 is an explanatory perspective view of a stapler moving mechanism. The figure explaining the structure of the binding process tray part which concerns on the example of a structure. (A) The figure which shows the state before pinching a paper bundle with a jogger fence, (b) The figure which shows the state after pinching a paper bundle with a jogger fence. The figure which shows the state which lifted the paper bundle with the jogger fence. The figure which shows the state which dropped the paper bundle. The figure explaining the structure of the binding process tray part which concerns on the example 2 of a structure. The figure which shows the state which lifted the paper bundle with the jogger fence. The figure which shows the state which dropped the paper bundle.

Hereinafter, an embodiment of a paper processing apparatus to which the present invention is applied will be described.
FIG. 2 illustrates a post-processing device 200 that is a paper processing device according to the present embodiment, and an image forming unit 300 such as a copier or a printer that supplies the post-processing device 200 with paper P that is a sheet material after image formation. 1 is a schematic configuration diagram of an image forming apparatus 600 comprising: In addition, the image forming apparatus 600 including the image forming unit 300 and the post-processing apparatus 200 is not limited to an image forming unit that forms an image on a sheet and a sheet processing unit that performs a folding process on the sheet. The present invention can be applied to the sheet processing means of the forming system.

  The image forming unit 300 of the present embodiment is an electrophotographic image forming apparatus including an image processing circuit, a photoconductor, an optical writing device, a developing device, a transfer device, and a fixing device, although not particularly illustrated. The image processing circuit converts image data read by a scanner unit when the image forming unit 300 is a copying machine or image data input from an external device such as a personal computer into printable image data, and the converted image data Is output to the optical writing device. The optical writing device performs optical writing on the photoconductor based on the image signal output from the image processing circuit to form an electrostatic latent image on the surface of the photoconductor. The developing device develops toner on the electrostatic latent image formed on the surface of the photoreceptor by optical writing. The transfer device transfers the toner image on the surface of the photoreceptor visualized by the developing device onto the paper P. The fixing device fixes the toner image transferred onto the paper P onto the paper P.

  The paper P on which the toner image is fixed by the image forming unit 300 is sent to the post-processing device 200, and the post-processing device 200 performs desired post-processing. As described above, the image forming unit 300 of the present embodiment is of an electrophotographic system, but all known image forming apparatuses such as an ink jet system and a thermal transfer system can be combined with the post-processing apparatus 200 as the image forming unit 300. it can.

  As shown in FIG. 2, the post-processing device 200 is attached to a side portion of the image forming unit 300, and the paper P discharged from the image forming unit 300 is guided to the post-processing device 200.

  In the post-processing apparatus 200 of the present embodiment, punching processing (punch unit 100), paper alignment + edge binding processing (jogger fence 53 and edge binding stapler S1), paper alignment + saddle binding processing for the paper P. (Saddle Stitch Upper Jogger Fence 250a, Saddle Stitch Lower Jogger Fence 250b and Saddle Stapling S2), Sorting of Paper P (Shift Tray 202), Saddle Folding (Folding Plate 74 and Folding Roller Pair 81) It can be performed. Each of these processes is performed by controlling the operation of each device or member in the post-processing apparatus 200 by a control unit (not shown) provided in the post-processing apparatus 200 and having a CPU, a memory, and the like.

  The entrance A of the post-processing apparatus 200 is a portion where the paper P discharged from the image forming unit 300 is first carried in, and a single-sheet post-processing unit that performs post-processing for each sheet of paper P that passes through. (In this embodiment, it has a punch unit 100 as a punching means). A first discharge conveyance path B that guides the paper P to the upper tray 201 is formed above the entrance A, and the paper P is transferred to the shift tray 202 at the side of the entrance A (left side in FIG. 2). A second discharge conveyance path C that leads is formed. A binding processing conveyance path D that guides the paper P to the binding processing tray portion F that performs alignment, stapling, and the like is formed below the entrance A of the post-processing device 200.

  The entrance A is a transport path on the upstream side in the transport direction with respect to the first discharge transport path B, the second discharge transport path C, and the binding processing transport path D, and is transferred from the image forming unit 300 to the post-processing device 200. A common conveyance path for all the sheets P that have been processed is formed. An inlet sensor 301 that detects the passage of the paper P received from the image forming unit 300 is disposed at the inlet A, and the inlet roller pair 1, the punch unit 100, the punch scum hopper 101, and the pre-branch conveyance are arranged downstream of the inlet sensor 301. The roller pair 2 is sequentially arranged. In addition, two branch claws of a first branch claw 15 and a second branch claw 16 are arranged on the downstream side of the pre-branch conveyance roller pair 2 at the entrance A.

  The first branch claw 15 and the second branch claw 16 are each held in the state of FIG. 2 by a biasing member (not shown) such as a spring. That is, the first branch claw 15 is urged so that the tip thereof is directed downward, and the second branch claw 16 is urged so that the tip thereof is directed upward. A solenoid (not shown) is connected to each of the first branch claw 15 and the second branch claw 16. By turning each solenoid on, the tips of the first branch claw 15 and the second branch claw 16 are in the state shown in FIG. The transport path of the paper P passing through the position where each branch claw is disposed can be switched.

  In the post-processing apparatus 200, the conveyance path of the paper P that has passed through the inlet A is changed to the first discharge conveyance path B by changing the ON / OFF combination of the solenoids of the first branch claw 15 and the second branch claw 16. , And distribute to the second discharge conveyance path C or the binding processing conveyance path D.

  When the sheet P that has passed through the entrance A is guided to the first discharge conveyance path B, the solenoids of the first branch claw 15 and the second branch claw 16 are both turned OFF to the state shown in FIG. By turning off a solenoid (not shown) connected to the first branching claw 15, the leading end of the first branching claw 15 faces downward, and the sheet P that has passed the pair of pre-branching conveyance rollers 2 enters the first discharge conveyance path B. Can lead. The sheet P guided to the first discharge conveyance path B is discharged to the upper tray 201 through the first discharge conveyance path conveyance roller pair 3 and the first discharge roller pair 4. As shown in FIG. 2, a first discharge paper detection sensor 302 is disposed in the vicinity of the upstream side of the first discharge roller pair 4 in the first discharge conveyance path B, and the passage of the paper P at the position where it is disposed. The presence or absence of is detected.

  When the paper P that has passed through the entrance A is guided to the binding processing conveyance path D, the solenoid of the first branch claw 15 is turned on and the solenoid of the second branch claw 16 is turned off. As a result, the front end of the first branch claw 15 changes from the downward state shown in FIG. 2 to the upward state, and the second branch claw 16 remains in the upward state shown in FIG. The sheet P that has passed 2 can be guided to the binding processing conveyance path D. The paper P guided to the binding processing transport path D is transported to the binding processing tray unit F.

  When the paper P that has passed through the entrance A is guided to the second discharge conveyance path C, the solenoids of the first branch claw 15 and the second branch claw 16 are both turned ON. Thus, in the initial state shown in FIG. 2, the tip of the downward first branch claw 15 is directed upward, and in the initial state, the tip of the upward second branch claw 16 is directed downward and passed through the pre-branch conveyance roller pair 2. The paper P can be guided to the second discharge conveyance path C. The paper P guided to the second discharge conveyance path C is conveyed to the shift tray 202 via the second discharge conveyance path conveyance roller pair 5 and the second discharge roller pair 6.

  As shown in FIG. 2, a second discharged paper detection sensor 303 is arranged in the vicinity of the upstream side of the second paper discharge roller pair 6 in the second discharge conveyance path C, and the passage of the paper P at the arranged position. The presence or absence of is detected.

  There is a shift tray discharge section constituted by the shift tray 202 and the like at the most downstream portion of the transport path of the paper P passing through the inlet section A and the second discharge transport path C in the post-processing apparatus 200. In addition to the shift tray 202, the shift tray paper discharge unit includes a second paper discharge roller pair 6, a return roller 13, and a shift tray paper surface detection sensor 330. Further, the shift tray discharge unit includes a shift mechanism (not shown) that reciprocates the shift tray 202 in a direction orthogonal to the conveyance direction of the paper P (paper width direction) and a non-illustrated shift mechanism that moves the shift tray 202 up and down. And a shift tray lifting mechanism shown in the figure.

  In the binding processing transport path D, from the upstream side in the transport direction, the binding processing transport path first roller pair 7, the paper guide claw 17, the prestack sensor 304, the binding processing transport path second roller pair 9, and the binding processing transport path third. A roller pair 10 and the like are arranged. Further, as shown in FIG. 2, the binding processing conveyance path D downstream of the binding processing conveyance path third roller pair 10 has a curve, and a curve entrance sheet detection sensor 305 is disposed at the entrance of this curve. Therefore, the presence or absence of passage of the paper P at the arranged position is detected. Further, at the exit of the curve, a binding process transfer roller pair 11 is provided that transfers the paper P that has passed through the binding process conveyance path D to the binding process tray unit F.

  The paper guide claw 17 in the binding processing conveyance path D is urged so as to be in the state of FIG. 2 by a low load spring (not shown). In the state shown in FIG. 2, an area in the binding processing conveyance path D where the binding processing conveyance path first roller pair 7 is arranged, a binding processing conveyance path second roller pair 9, and a binding processing conveyance path third roller pair 10 are arranged. The paper guide claw 17 is in a state of being closed between the two areas. The sheet guide claw 17 rotates counterclockwise in FIG. 2 against the urging force of the low load spring when the sheet P conveyed by the binding processing conveyance path first roller pair 7 and the like comes into contact. As a result, the sheet P is guided to an area in the binding processing transport path D where the binding processing transport path second roller pair 9 and the binding processing transport path third roller pair 10 are arranged. When the rear end of the paper P passes the position where the paper guide claw 17 is disposed, the paper guide claw 17 returns to the state shown in FIG. 2 by the urging force of the low load spring.

  In the post-processing device 200, while the binding process is being performed in the binding processing tray unit F, the next sheet P cannot be received in the binding processing tray unit F. Here, the delivery of the paper P from the image forming unit 300 to the post-processing device 200 is performed so that the new paper P is not supplied to the binding processing tray unit F while the binding processing in the binding processing tray unit F is being performed. When the operation is stopped, the productivity of the entire image forming apparatus 600 decreases. In the post-processing apparatus 200, in order to increase the time required for the binding process while maintaining the productivity of the entire image forming apparatus 600, the paper P is temporarily retained, and thereafter, a plurality of sheets P are simultaneously bound to the binding processing tray. A so-called pre-stack process is performed in which a substantial amount of time is transferred to the part F.

  The post-processing device 200 is arranged on the downstream side in the transport direction with respect to the sheet guide claw 17 in the binding processing transport path D when performing the pre-stack processing, and the binding processing transport path second roller pair 9 and the binding processing transport path first. Of the three roller pair 10 and the binding processing delivery roller pair 11, at least the rotation direction of the binding processing conveyance path second roller pair 9 can be reversed. When the pre-stacking process for temporarily staying the paper P before being transported to the binding processing tray portion F is performed, at least the binding processing transport is performed after the rear end of the paper P has passed the position where the paper guide claw 17 is disposed. The path second roller pair 9 is reversed. At this time, since the conveyance path toward the region where the binding processing conveyance path first roller pair 7 is disposed is blocked by the sheet guide claw 17, the sheet P conveyed by the reverse rotation of the conveyance roller pair is prestacked. E can be guided. Therefore, the paper P can be transported along the turn guide 8 by reversing the transport roller pair after the rear end of the paper P has passed the position where the paper guide claw 17 is disposed. With such a configuration, the paper P is guided from the rear end side in the transport direction to the pre-stack unit E to stay (pre-stack), and is superposed on the next paper P to be transported toward the binding processing tray unit F. It becomes possible to do.

  In this way, by repeating the operation of reversing the conveying roller pair after the rear end of the paper P has passed the position where the paper guide claw 17 is disposed, two or more sheets P are stacked on the binding processing tray portion F. It can also be transported. The timing to reverse the conveying roller pair is set after the timing when the prestack sensor 304 detects the rear end of the paper P that has passed the position where the paper guide claw 17 is disposed.

  The sheet P guided to the binding processing tray section F through the entrance section A and the binding processing conveyance path D and subjected to post-processing such as alignment and stapling in the binding processing tray section F is shifted by the sheet bundle branching guide member 44. The sheet is distributed to a conveyance path toward the tray 202 or a conveyance path toward the lower tray 203.

  When the paper is distributed to the conveyance path toward the shift tray 202, the second discharge conveyance path C is guided to the vicinity of the upstream side of the second discharge sheet detection sensor 303, and similarly to the sheet P passing through the second discharge conveyance path C. The paper is discharged to the shift tray 202 by the two paper discharge roller pairs 6.

  On the other hand, when the paper is sorted to the conveyance path toward the lower tray 203, it is transferred to the saddle stitching / folding processing unit G that performs the folding process on the paper P, and the folding plate 74 is fed by the saddle stitching / folding processing unit G. A post-process such as a half-fold process is performed. The paper P that has been subjected to post-processing such as the middle folding process passes through a post-folding conveyance path H and is conveyed to the lower tray 203 by the lower discharge roller pair 83. As shown in FIG. 2, a lower discharge paper detection sensor 323 is disposed in the vicinity of the upstream side of the lower discharge roller pair 83 in the post-folding conveyance path H, and the passage of the paper P at the position where it is disposed. Detect the presence or absence.

Next, the binding processing tray unit F will be described.
FIG. 3 is a schematic configuration diagram of the binding processing tray portion F viewed from the stacking surface side of the staple tray 50 (in the direction of arrow J in FIG. 2). FIG. 4 is a perspective view showing a schematic configuration of each member constituting the binding processing tray portion F and its attached mechanism. Further, α in FIG. 4 is an enlarged side view in the vicinity of the hitting roller 12. As shown in FIG. 3, a front side plate 64a and a rear side plate 64b are disposed at both ends of the binding processing tray portion F in the paper width direction.

  The sheets P guided to the binding processing tray unit F by the binding processing delivery roller pair 11 are sequentially stacked on the binding processing tray unit F as shown in FIG. At this time, every time the paper P reaches the binding processing tray portion F, the tapping roller 12 performs alignment in the vertical direction (conveyance direction), and the jogger fence 53 (front side jogger fence 53a, back side jogger fence 53b) performs lateral alignment. Alignment in the direction (paper width direction which is a direction orthogonal to the transport direction) is performed.

  2, 3, and 4, the binding processing tray unit F is provided with a tray unit paper detection sensor 310 that detects whether or not the paper P is stacked at the arranged position.

  The hitting roller 12 is given a pendulum motion around the hitting fulcrum 12a as shown by arrows m1 and m2 in FIG. Further, the hitting roller 12 itself rotates counterclockwise as indicated by an arrow n in FIG. As a result, the conveying force due to the rotation of the hitting roller 12 acts intermittently on the paper P sent to the binding processing tray portion F, and the paper P is abutted against the rear end reference fence 51.

  As shown in FIGS. 3 and 4, the jogger fence 53 is provided in a pair (53a, 53b) in the paper width direction, and is driven by a jogger motor 158 capable of forward / reverse rotation via the timing belt 160 to reciprocate in the paper width direction. Moving.

Here, the reciprocation of the jogger fence 53 in the paper width direction will be described.
When the length of the paper P to be aligned in the paper width direction is the paper width W, in the standby state until the paper P is transported, the paper width direction between the front jogger fence 53a and the back jogger fence 53b This distance is slightly wider than the paper width W. When the paper P is fed into the binding processing tray F and reaches between the two jogger fences 53, the front jogger fence 53a is in the k1 direction in FIG. 4, and the back jogger fence 53b is l1 in FIG. Move in the direction. When the distance between the two jogger fences 53 in the sheet width direction becomes the sheet width W, the jogger motor 158 (the front jogger motor 158a and the rear jogger motor 158b) is reversed, and the distance between the two jogger fences 53 in the sheet width direction is reduced. The near-side jogger fence 53a is moved in the k2 direction in FIG. 4 and the back-side jogger fence 53b is moved in the l2 direction in FIG. 4 until the distance in the standby state is reached. By such control, after the two jogger fences 53 move inward at the same time, the jogger fence 53 reciprocally moves outward simultaneously. Each time the paper P is sent to the binding processing tray unit F, the above-described reciprocating movement is performed once or a plurality of times, whereby a bundle of papers P stacked on the binding processing tray unit F (hereinafter also referred to as a paper bundle P1). Align in the paper width direction.

  In the present embodiment, the two jogger fences 53 reciprocate to align the sheet bundle P1 in the sheet width direction, but the operation of the jogger fence 53 when aligning the sheet bundle P1 in the sheet width direction is performed. However, it is not limited to this. While one of the two jogger fences 53 is stopped, only the other jogger fence 53 may be reciprocated in the paper width direction.

  The post-processing device 200 includes an end surface binding stapler S1 as a binding unit that performs a binding process on the rear end portion of the sheet bundle P1 stacked on the binding processing tray unit F. The end surface binding stapler S1 is configured to be movable in the sheet width direction of the aligned sheet bundle P1. In the post-processing device 200, the end-face binding stapler S1 that is a binding unit is driven based on a staple signal from a control device (not shown) at a job break, and a binding process is performed on the sheet bundle P1 for which the alignment operation has been completed. Here, the job break is from the arrival of the sheet P, which is the last sheet of the stacked sheet bundle P1, to the binding processing tray section F until the arrival of the sheet P, which is the first sheet of the next sheet bundle P1. Between.

FIG. 6 is an explanatory perspective view showing a moving mechanism of the end face binding stapler S1.
As shown in FIG. 6, the end-bound stapler S1 is driven via a stapler timing belt by a stapler moving motor 159 capable of forward and reverse rotation, and binds a predetermined position at the end of the sheet bundle P1 on the rear end side in the conveyance direction. Move in the paper width direction. A stapler movement HP sensor 312 that detects the home position of the end-face binding stapler S1 is provided at one end of the movement range, and the binding position in the paper width direction is the amount of movement of the end-face binding stapler S1 from the home position. Controlled by

  A rear end pressing lever 110 is disposed on the upper right side of the end surface binding stapler S1 in FIG. The rear end pressing lever 110 is disposed at a position facing the lower end portion of the rear end reference fence 51 so that the rear end of the sheet bundle P1 accommodated in the rear end reference fence 51 can be pressed. As shown by the arrow Q, the structure can be reciprocated in a direction substantially perpendicular to the placement surface of the binding processing tray portion F.

  In the binding processing tray part F, every time the paper P arrives, the tapping roller 12 performs alignment in the vertical direction (paper transport direction), but the trailing edge of the paper P stacked on the binding processing tray part F is curled. If the waist is weak, the trailing edge tends to buckle and swell due to its own weight. Furthermore, as the number of stacked sheets increases, the gap for entering the next sheet P in the rear end reference fence 51 is reduced, and the vertical alignment tends to deteriorate. Therefore, the swelling of the trailing edge of the paper P accommodated in the binding processing tray portion F is reduced, and the paper P newly reaching the binding processing tray portion F is made easier to enter the trailing edge reference fence 51. Is the rear end pressing mechanism, and the rear end pressing lever 110 directly presses the paper P.

  The sheet bundle P1 subjected to the binding process is discharged to the shift tray 202 by the discharge belt 52. Here, the discharge operation of the sheet bundle P1 by the discharge belt 52 will be described.

  FIG. 5 is a perspective view for explaining the discharge operation of the discharge belt 52. Further, β in FIG. 5 is an enlarged perspective view in the vicinity of the discharge belt HP sensor 311.

  As shown in FIG. 3, the discharge belt 52 is positioned at the alignment center in the paper width direction, and the discharge belt 52 is stretched between a plurality of pulleys 65 as shown in FIG. By driving the discharge motor 157, the pulley 65 that supports the upper end of the discharge belt 52 is rotationally driven, the drive is transmitted to the discharge belt 52, and the discharge belt 52 moves endlessly.

  The discharge belt 52 is provided with a discharge claw 52a protruding on the outer periphery thereof, and the discharge motor 157 is driven to rotate the discharge belt 52 counterclockwise in FIG. The discharge claw 52a hits the rear end (lower end) of the broken sheet bundle P1. Thereafter, the discharge belt 52 further moves endlessly, whereby the sheet bundle P1 is lifted by the discharge claw 52a and discharged from the binding processing tray portion F.

  As shown in FIGS. 2 and 3, the plurality of discharge rollers 56 are arranged symmetrically in the paper width direction on the same axis as the pulley 65 that transmits driving to the discharge belt 52 with the discharge belt 52 interposed therebetween. The plurality of discharge rollers 56 are rotatably provided with respect to a drive shaft that transmits drive from the discharge motor 157 to the pulley 65, and function as driven rollers when discharging the sheet bundle P1.

  The discharge operation of the sheet bundle P1 from the binding processing tray portion F by the discharge belt 52 described above can be performed similarly for an unbound sheet bundle that is not subjected to the binding process after the alignment process. Further, the transport destination of the sheet bundle P1 discharged from the binding processing tray unit F is not limited to the shift tray 202, and the lower tray 203 can be set as the transport destination as described later.

  As shown in the enlarged view of β in FIG. 5, the release claw 52 a is configured such that the home position is detected by the release belt HP sensor 311, and this release belt HP sensor 311 is provided on the release belt 52. It is turned on / off by the discharge claw 52a. On the outer periphery of the discharge belt 52, two discharge claws 52a are arranged at positions that equally divide the circumference, and the sheet bundle P1 accommodated in the binding processing tray portion F is moved and conveyed alternately by the two discharge claws 52a. .

  Further, if necessary, the discharge belt 52 is reversely rotated, and the paper stored in the binding processing tray portion F on the back surface of the discharge claw 52a opposite to the discharge claw 52a waiting to move the sheet bundle P1. It is also possible to align the front ends of the bundle P1 in the conveyance direction.

  On the downstream side of the binding processing tray unit F in the sheet conveyance direction, a sheet bundle conveyance path switching unit I is provided. The sheet bundle conveyance path switching unit I conveys the conveyance path of the sheet bundle P1 discharged from the binding processing tray unit F to the saddle stitching / folding processing unit G or the conveyance path to convey to the shift tray 202. It is the structure which distributes to. The sheet bundle conveying path switching unit I turns the sheet bundle conveying mechanism 35 for applying a conveying force to the sheet bundle P1 lifted by the discharge claw 52a, the discharge roller 56 for turning the sheet bundle P1, and the sheet bundle P1. The sheet bundle branch guide member 44 and the like for performing the above-described guide are configured.

  Here, the configuration of each member of the sheet bundle conveyance path switching unit I will be described. The driving force of the sheet bundle conveying drive shaft 37 is transmitted to the sheet bundle conveying roller 36 of the sheet bundle conveying mechanism 35 by the sheet bundle conveying timing belt. The sheet bundle conveying roller 36 and the sheet bundle conveying drive shaft 37 are connected and supported by an arm, and can be rotated using the sheet bundle conveying drive shaft 37 as a rotation fulcrum. The sheet bundle conveying roller 36 of the sheet bundle conveying mechanism 35 is driven to swing by a sheet bundle conveying member rocking cam 40. The sheet bundle conveying member rocking cam 40 drives a motor (not shown) to rotate the rocking shaft. Swings to the center.

  In the sheet bundle conveying mechanism 35, a sheet bundle conveying driven roller 42 is disposed at a position facing the sheet bundle conveying roller 36. The sheet bundle conveying driven roller 42 is pressed against the sheet bundle conveying roller 36 by an elastic member, and the sheet bundle conveying roller 36 sandwiches the sheet bundle P1 between the sheet bundle conveying driven roller 42 and the sheet bundle conveying roller 36. A conveying force is applied to the sheet bundle P1 by being driven to rotate clockwise in FIG.

  The sheet bundle branch guide member 44 is supported so as to be rotatable about a branch guide shaft 44a, and the drive is transmitted from the sheet bundle branch guide drive motor 161 shown in FIG. To turn. Of the surfaces of the sheet bundle branching guide member 44, the upper surface is the upper guide surface 44b, and the lower surface facing the discharge roller 56 is the lower guide surface 44c.

  When transporting the sheet bundle P1 from the binding processing tray section F to the saddle stitching / folding processing section G, the sheet bundle P1 lifted by the discharge claw 52a is turned at the upper end of the discharge belt 52 and directed downward. Transport. The conveyance path for turning the sheet bundle P1 downward in this way is formed between the upper surface of the discharge roller 56 and the lower guide surface 44c of the sheet bundle branching guide member 44.

  When the sheet bundle P1 is conveyed from the binding processing tray portion F to the shift tray 202, the sheet bundle branch guide member 44 rotates about the branch guide shaft 44a in the clockwise direction in FIG. A space between the upper guide surface 44b of the member 44 and the guide plate facing the upper guide surface 44b functions as a conveyance path.

  When the sheet bundle P1 is sent from the binding processing tray portion F to the saddle stitching / folding processing portion G, the rear end of the sheet bundle P1 aligned in the binding processing tray portion F is pushed up by the discharge claw 52a, and the sheet bundle conveying mechanism 35 The sheet bundle P1 is sandwiched between the sheet bundle conveying roller 36 and the sheet bundle conveying driven roller 42, and a conveying force is applied. At this time, at the timing when the leading end of the sheet bundle P1 pushed up by the discharge claw 52a passes the position where the sheet bundle conveyance roller 36 and the sheet bundle conveyance driven roller 42 sandwich the sheet bundle P1, the sheet bundle conveyance roller 36 is Waiting at a position where it does not hit the tip of P1.

  When the leading end of the sheet bundle P1 passes through the position where the sheet bundle conveyance roller 36 and the sheet bundle conveyance driven roller 42 sandwich the sheet bundle P1, the sheet bundle conveyance roller 36 is brought into contact with the surface of the sheet bundle P1, and the sheet bundle conveyance roller 36 is brought into contact. Is applied to the sheet bundle P1. The sheet bundle P1 to which the conveying force is applied by the sheet bundle conveying roller 36 passes through a turn conveying path formed between the upper surface of the discharge roller 56 and the lower guide surface 44c of the sheet bundle branching guide member 44, It is conveyed to the saddle stitching / folding processing section G.

  As shown in FIG. 2, the saddle stitching and center folding processing unit G is provided on the downstream side in the paper transport direction of the paper bundle transport path switching unit I. The saddle stitching / folding processing unit G is formed so that the conveyance path of the sheet bundle P1 conveyed from the sheet bundle conveyance path switching unit I is substantially vertical, and is formed at the center of the vertical conveyance path. A center folding mechanism including a folding plate 74 and the like is disposed. A saddle stitching unit upper sheet bundle conveyance guide plate 92 is disposed above the middle folding mechanism, and a saddle stitching unit lower sheet bundle conveyance guide plate 91 is disposed below the middle folding mechanism.

  A pair of upper saddle-stitched paper bundle transport rollers 71 is disposed above the saddle-stitched section upper paper bundle transport guide plate 92. A conveyance roller pair 72 is disposed. The saddle stitching section upper sheet bundle conveyance roller pair 71 and the saddle stitching section lower sheet bundle conveyance roller pair 72 are straddled along both side surfaces of the saddle stitching section upper sheet bundle conveyance guide plate 92 in the sheet width direction. A saddle stitching section upper jogger fence 250a is disposed. Similarly, the saddle stitching portion lower jogger fence 250b is disposed along both side surfaces of the saddle stitching portion lower sheet bundle conveyance guide plate 91 in the sheet width direction.

  The saddle stitching stapler S2 is disposed at a place where the saddle stitching portion lower jogger fence 250b is installed.

  The saddle stitching portion upper jogger fence 250a and the saddle stitching portion lower jogger fence 250b are driven by a driving mechanism (not shown) and perform an alignment operation in the sheet width direction with respect to the sheet bundle P1 in the saddle stitching and center folding processing unit G. The saddle stitching stapler S2 is disposed so that the clincher part and the driver part are paired across the conveyance path formed by the sheet bundle conveyance guide plate 91 below the saddle stitching part. Are provided in two pairs at a predetermined interval in the paper width direction.

  Further, a saddle stitching portion movable front end fence 73 is disposed so as to cross the saddle stitching portion lower sheet bundle conveyance guide plate 91. The saddle stitching portion movable front end fence 73 is movable in the paper transport direction (vertical direction in FIG. 2) by a drive mechanism including a front end fence timing belt 73a driven by a drive source (not shown).

  As shown in FIG. 2, the drive mechanism of the saddle stitching portion movable front end fence 73 includes a drive pulley and a driven pulley over which a front end fence timing belt 73a is stretched, and a stepping motor which is a drive source (not shown) that drives the drive pulley. It is configured. Further, a front end fence HP sensor 322 for detecting the home position of the saddle stitching portion movable front end fence 73 is disposed at the lower end of the front end fence timing belt 73a.

  A rear end tapping claw 251 and its drive mechanism are provided on the upper end side of the saddle stitching section upper paper bundle conveyance guide plate 92. The rear end tapping claw 251 abuts against the rear end of the sheet bundle P1 stacked on the saddle stitching and middle folding processing unit G by a driving mechanism including a rear end tapping claw timing belt 252 driven by a driving source (not shown). And reciprocating in the direction away from the rear end of the sheet bundle P1.

  Although only a part of the upper end side of the rear end tapping claw timing belt 252 is shown in FIG. 2, the rear end tapping claw timing belt 252 is a loop-like endless belt like other timing belts. As shown in FIG. 2, a rear end tapping claw HP sensor 326 is disposed inside the upper end portion of the rear end tapping claw timing belt 252 and detects the home position of the rear end tapping claw 251. 2, the position indicated by the two-dot chain line in FIG. 2 is the home position, and at the timing when the sheet bundle P1 is conveyed from the binding processing tray portion F to the saddle stitching / folding processing portion G, The position of the end hitting claw 251 is the home position. Thereafter, after the front end of the sheet bundle P1 conveyed into the saddle stitching / folding processing section G hits the saddle stitching section movable front end fence 73, the rear end tapping claw timing belt 252 is driven and the rear end tapping claw 251 is driven. Is abutted against the rear end of the sheet bundle P1 to align the sheet bundle P1 in the sheet conveyance direction.

  The half-folding mechanism is provided at substantially the center of the saddle stitching / folding processing section G, and includes a folding plate 74 and a pair of folding rollers 81, and a post-folding conveyance path H for conveying the folded sheet bundle P1. ing. In the post-folding conveyance path H, a lower discharge sheet detection sensor 323 for detecting passage of the folded sheet bundle P1 is disposed. Above the folding plate 74, the sheet bundle P1 is folded in the middle. A folding part arrival sensor 321 for detecting that the position has been reached is arranged.

  The post-processing apparatus 200 includes a height detection lever 501 for detecting the stacking height of the sheet bundle P1 that passes through the post-folding conveyance path H and is discharged to the lower tray 203. The height detection lever 501 is swingably disposed with the lever fulcrum 501a as a swing center, and a change in the angle of the height detection lever 501 is detected by the lower tray paper surface sensor 505. Based on the detection result, the lower tray Control of the up-and-down operation 203 and detection of overflow are performed.

  Next, the characteristic part of the post-processing apparatus 200 according to the present embodiment will be described.

[Configuration example 1]
FIG. 7 is a diagram illustrating the configuration of the binding processing tray unit F according to the configuration example 1.
The jogger fence 53 of this configuration example has a protrusion 141 having one end fixed to the back surface of the bottom plate of the jogger fence 53 and a shaft bar 142 provided on the outer side surface in the paper width direction on the other end side. In addition, a guide plate 143 having a long hole 144 formed in the paper conveyance direction in which the shaft rod 142 of the protrusion 141 is fitted is provided, and the shaft bar 142 is moved in the paper conveyance direction by the inner wall surface of the long hole 144. Guided. Further, a cam 62 having a convex portion 62a and a circular portion 62b is provided for moving the shaft rod 142 fitted in the long hole 144 of the guide plate 143 to the upstream side or the downstream side in the paper transport direction. Then, the cam 62 is rotated by a motor 66 as drive means, so that the shaft rod 142 moves in the paper transport direction along the shape of the convex portion 62a and the circular portion 62b of the cam 62, and the jogger fence 53 is moved accordingly. It can be moved in the paper transport direction.

  The guide plate 143, the cam 62, and the motor 66 are movable in the paper width direction by a mechanism (not shown) in conjunction with the movement of the jogger fence 53 in the paper width direction.

FIG. 1 is a flowchart of sheet bundle alignment control.
When aligning a bundle of sheets, sheets are stacked on the staple tray 50 of the binding processing tray portion F (S1). Then, as shown in FIG. 8A, when the number of sheets stacked on the staple tray 50 reaches a desired number, the jogger fence 153 is driven by the jogger motor 158 via the timing belt 160, and the jogger fence 53 is driven. Is moved further inward than the paper width toward the inner side in the paper width direction. As a result, as shown in FIG. 8B, the sheet bundle P1 held between the jogger fences 53 on both sides in the sheet width direction is bent, and a gap is formed between the sheets to reduce the contact points between the sheets. Thus, friction between sheets can be reduced (S2).

  Then, in a state where the sheet bundle P1 is bent and a gap is formed between the sheets, the cam 66 is rotated by the motor 66 so that the shaft rod 142 fitted in the long hole 144 of the guide plate 143 is moved downstream in the sheet conveying direction. The jogger fence 53 is moved downstream in the paper transport direction. As a result, as shown in FIG. 9, the sheet bundle P1 sandwiched and held on both sides in the sheet width direction by the jogger fence 53 is lifted to the downstream side in the sheet conveying direction, and the sheet trailing edge moves away from the trailing edge reference fence 51 ( S3).

  Further, the surface of the jogger fence 53 that comes into contact with the sheet width direction end surface of the sheet bundle P1 is a high friction portion having a high coefficient of friction with respect to the sheet, and the sheet bundle P1 can be reliably lifted by the jogger fence 53.

  After the paper bundle P1 is lifted to the downstream side in the paper conveyance direction by the jogger fence 53, the jogger fence 153 is driven by the jogger motor 158 via the timing belt 160, and the surface of the jogger fence 53 in contact with the end face in the paper width direction of the paper bundle P1. The jogger fence 53 is moved toward the outside in the paper width direction so that is positioned outside the paper width. As a result, as shown in FIG. 10, the sheet bundle P1 that is no longer held by the jogger fence 53 falls to the upstream side in the sheet conveyance direction due to its own weight, and the rear end of the sheet bundle P1 hits the rear end reference fence 51 ( S4).

  In this configuration example, the sheet bundle P1 lifted along the staple tray by the jogger fence 53 is dropped in a state in which the sheet bundle P1 is bent to form a gap between the sheets and prevent the sheets from sticking to each other. The rear end of the sheet bundle P1 can be abutted against the rear end reference fence. Thereby, the influence of friction acting between the sheets is reduced as compared with the state where the sheets of the sheet bundle P1 are in close contact with each other, and each sheet is easily moved in the sheet bundle. Therefore, in the middle of the stacking on the staple tray 50, the paper whose trailing edge has not fallen down to the trailing edge reference fence 51 surely falls to the trailing edge reference fence 51 when the sheet bundle is dropped. The trailing edge of each sheet can be abutted against the trailing edge alignment member. Therefore, it is possible to align the sheet conveyance direction of the sheet bundle with higher alignment accuracy than when aligning the sheet bundle in the sheet conveyance direction with the sheets of the sheet bundle in close contact with each other. Then, the binding process can be performed on the sheet bundle P1 in such a state that the sheet conveyance direction of the sheet bundle P1 is aligned with high alignment accuracy.

  Further, by repeatedly lifting and dropping the sheet bundle P1 by the jogger fence 53 as described above, the trailing edge of the sheet can be more reliably abutted against the reference fence, so the sheet width direction can be adjusted with higher alignment accuracy. Binding processing can be performed on the aligned sheet bundle P1.

[Configuration example 2]
FIG. 11 is a diagram illustrating the configuration of the binding processing tray unit F according to Configuration Example 2.
In this configuration example, a belt 61 that is an endless belt member disposed so as to be in contact with the outer surface of the jogger fence 53 in the paper width direction, and a tension roller that is two tension members that stretch the belt 61. A jogger fence transport direction moving device 185 is provided that includes 60a and 60b and a motor 180 that is a driving unit that rotationally drives the stretching roller 60a and moves the jogger fence 53 in the paper transport direction. Further, the jogger fence transport direction moving device 185 is movable in the paper width direction by a mechanism (not shown) in conjunction with the movement of the jogger fence 53 in the paper width direction.

  When a desired number of sheets are stacked on the binding processing tray portion F, the jogger fence 53 is driven by the jogger motor 158 via the timing belt 160 to move the jogger fence 53 toward the inner side in the sheet width direction. Move further inside than the width. As a result, the sheet bundle P1 sandwiched and held by the jogger fence 53 on both sides in the sheet width direction is bent, and a gap is formed between the sheets, thereby reducing friction between the sheets by reducing contact points between the sheets. it can.

  Then, in a state where the sheet bundle P1 is bent and a gap is formed between the sheets, the tension roller 60a is rotationally driven by the motor 180, and the belt 61 so that the jogger fence 53 moves toward the downstream side in the sheet conveying direction. Rotate (surface movement). As a result, as shown in FIG. 12, the jogger fence 53 moves to the downstream side in the sheet conveyance direction, and the sheet bundle P1 sandwiched and held on both sides in the sheet width direction by the jogger fence 53 is lifted to the downstream side in the conveyance direction. The rear end moves away from the rear end reference fence 51.

  In addition, the jogger fence 53 can reliably lift the sheet bundle P1 by making the surface of the jogger fence 53 in contact with the sheet width direction end surface of the sheet bundle P1 a high friction portion having a high friction coefficient with respect to the sheet.

  After the paper bundle P1 is lifted to the downstream side in the paper conveyance direction by the jogger fence 53, the jogger fence 153 is driven by the jogger motor 158 via the timing belt 160, and the surface of the jogger fence 53 in contact with the end face in the paper width direction of the paper bundle P1. The jogger fence 53 is moved toward the outside in the paper width direction so that is positioned outside the paper width. As a result, as shown in FIG. 13, the sheet bundle P <b> 1 that is no longer held by the jogger fence 53 falls to the upstream side in the sheet transport direction due to its own weight, and the rear end of the sheet bundle P <b> 1 hits the rear end reference fence 51.

  Also in this configuration example, the rear end of the sheet bundle P1 hits the rear end reference fence 51 in a state where the sheet bundle P1 is bent and the friction between the sheets is reduced. Therefore, in the middle of the stacking of the sheets on the staple tray 50 of the binding processing tray portion F, the sheet whose trailing edge has not fallen down to the trailing edge reference fence 51 surely falls to the trailing edge reference fence 51. Can be cut. Therefore, the binding process can be performed on the sheet bundle P1 in a state where the sheet conveyance direction of the sheet bundle P1 is aligned with high alignment accuracy.

  Further, by repeatedly lifting and dropping the sheet bundle P1 by the jogger fence 53 as described above, the trailing edge of the sheet can be more reliably abutted against the reference fence, so the sheet width direction can be adjusted with higher alignment accuracy. Binding processing can be performed on the aligned sheet bundle P1.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
Paper transport means for transporting paper, a paper tray such as a staple tray 50 for stacking a plurality of paper transported by the paper transport means on a paper stacking surface and stacking them as a paper bundle, and paper sheets stacked on the paper tray A paper sheet is sandwiched between a rear edge aligning member such as a rear edge reference fence 51 that abuts the rear edge of the paper in the conveyance direction and aligns the rear edge of the paper in the paper conveyance direction, and both ends of the paper loaded in the paper tray in the paper width direction. In a paper processing apparatus such as the post-processing apparatus 200 provided with a width direction aligning means such as a jogger fence 53 that aligns both ends in the width direction, the rear end of the paper stacked on the paper stacking surface is below the paper stacking surface of the paper tray. The width direction aligning means is movable in the paper transport direction, and the width direction aligning means is bent so that the sheet bundle loaded on the paper tray is bent. By holding sandwiching the sheet bundle, having a control unit such as control unit for controlling abutting a rear end and rear-end aligning member of the sheet bundle. According to this, as described in the above embodiment, it is possible to obtain a high alignment accuracy of the sheet bundle in the sheet conveyance direction.
(Aspect B)
In (Aspect A), the control unit sandwiches and holds the sheet bundle by the width direction aligning unit so that the sheet bundle stacked on the sheet tray is bent, and the sheet bundle is moved upward along the sheet stacking surface by the width direction aligning unit. After the lifting, the holding of the sheet bundle by the width direction aligning means is released, the sheet bundle is dropped along the sheet stacking surface, and the rear end of the sheet bundle is controlled to abut against the rear end aligning member. According to this, as described in the above embodiment, it is possible to obtain a high alignment accuracy of the sheet bundle in the sheet conveyance direction.
(Aspect C)
In (Aspect A) or (Aspect B), the control by the control means is repeated a plurality of times. According to this, as described in the above embodiment, the sheet width direction of the sheet bundle can be aligned with higher alignment accuracy.
(Aspect D)
In (Aspect A), (Aspect B), or (Aspect C), the surface of the width direction aligning means that contacts the paper is a high friction portion having a high coefficient of friction against the paper. According to this, as described in the above embodiment, the sheet bundle can be reliably lifted by the width direction aligning means.
(Aspect E)
In (Aspect A), (Aspect B), (Aspect C), or (Aspect D), the width direction aligning means is a pair of plate-like members that come into contact with the outer surface of the plate-like member in the paper width direction. A belt member such as a belt 61 that moves the plate-like member in the paper conveyance direction in conjunction with the movement, a plurality of stretching members such as stretching rollers 60 a and 60 b that stretch the belt member so that the surface of the belt member can be moved, and a plurality of stretching members Drive means such as a motor 180 that rotationally drives a roller member that is one of the tension members. According to this, as described in the above embodiment, the sheet bundle can be reliably lifted by the width direction aligning means.
(Aspect F)
In (Aspect A), (Aspect B), (Aspect C), (Aspect D), or (Aspect E), a binding unit that performs a binding process on the sheet bundle is provided. According to this, as described in the above embodiment, the binding process can be performed on the sheet bundle aligned with high alignment accuracy.
(Aspect G)
In an image forming apparatus including an image forming unit that forms an image on a sheet and a sheet processing unit that performs a predetermined process on the sheet formed by the image forming unit. The paper processing apparatus of A), (Aspect B), (Aspect C), (Aspect D), (Aspect E) or (Aspect F) was used. According to this, as described in the above embodiment, it is possible to obtain a high alignment accuracy in the sheet conveyance direction of the sheet bundle on which the image is formed.

DESCRIPTION OF SYMBOLS 1 Entrance roller pair 2 Pre-branch conveyance roller pair 3 1st discharge conveyance path conveyance roller pair 4 1st discharge roller pair 5 2nd discharge conveyance path conveyance roller pair 6 2nd discharge roller pair 7 Binding process conveyance path 1st One roller pair 8 Turn guide 9 Binding process conveyance path second roller pair 10 Binding process conveyance path third roller pair 11 Binding process delivery roller pair 12 Tapping roller 12a Support point 13 Return roller 15 First branch claw 16 Second branch claw 17 Paper Guide claw 35 Sheet bundle conveyance mechanism 36 Sheet bundle conveyance roller 37 Sheet bundle conveyance drive shaft 40 Sheet bundle conveyance member swing cam 42 Sheet bundle conveyance driven roller 44 Sheet bundle branch guide member 44a Branch guide shaft 44b Upper guide surface 44c Lower guide surface 50 Staple tray 51 Rear end reference fence 52 Release belt 52a Release claw 53 Jogger fence 53a -Fence 53b Back side jogger fence 56 Discharge roller 60a Tension roller 60b Tension roller 61 Belt 62 Cam 62a Protruding part 62b Circle part 64a Front side plate 64b Rear side plate 65 Pulley 66 Motor 71 Saddle binding part Upper paper bundle conveying roller pair 72 Saddle binding Lower sheet bundle conveyance roller pair 73 Saddle binding portion movable front end fence 73a Front end fence timing belt 74 Folding plate 81 Folding roller pair 83 Lower discharge roller pair 91 Saddle binding lower sheet bundle conveyance guide plate 92 Saddle binding upper sheet bundle conveyance Guide plate 100 Punch unit 101 Hopper 110 Lever 141 Protruding portion 142 Shaft bar 143 Guide plate 144 Long hole 157 Release motor 158 Jogger motor 159 Stapler moving motor 160 Timing belt 161 Paper bundle branching guide drive motor 170 Sole Noid 180 Motor 185 Jogger fence transport direction moving device 200 Post-processing device 201 Upper tray 202 Shift tray 203 Lower tray 250a Saddle stitching section upper jogger fence 250b Saddle stitching section lower jogger fence 251 Trailing edge tapping claw 252 Nail timing belt 300 Image forming section 301 Inlet sensor 302 First discharged paper detection sensor 303 Second discharged paper detection sensor 304 Pre-stack sensor 305 Curve inlet paper detection sensor 310 Tray section paper detection sensor 311 Release belt HP sensor 312 Stapler movement HP sensor 321 Folding section arrival sensor 322 Front end Fence HP sensor 323 Lower discharge paper detection sensor 326 Rear end tapping claw HP sensor 330 Shift tray paper surface detection sensor 501 Detection lever 501a Lever fulcrum 505 Tray sheet surface sensor 600 an image forming apparatus

JP 2000-327205 A

Claims (6)

Paper transport means for transporting paper,
A paper tray on which a plurality of sheets conveyed by the sheet conveying means are stacked on a sheet stacking surface and stacked as a sheet bundle;
A rear end aligning member that abuts the rear end of the paper loaded in the paper tray in the paper transport direction and aligns the rear end of the paper in the paper transport direction;
A sheet processing apparatus comprising: a width direction aligning unit that sandwiches both ends of the sheets stacked in the sheet tray in the sheet width direction and aligns both ends of the sheets in the sheet width direction;
The paper stacking surface of the paper tray is inclined with respect to the horizontal direction so that the trailing edge of the paper stacked on the paper stacking surface is downward, and the width direction aligning means moves in the paper transport direction. Is possible,
After the sheet bundle loaded on the sheet tray is bent and held by the width direction aligning unit so that the sheet bundle is bent, the sheet bundle is lifted upward along the sheet stacking surface by the width direction aligning unit. , to release the holding of the paper bundle by the width direction aligning means the paper bundle is dropped along the paper stacking surface, it performs control to abut the trailing end of the paper bundle in the rear-end aligning member control means A sheet processing apparatus comprising: The sheet processing apparatus according to claim 1 , wherein
A sheet processing apparatus, wherein the control by the control means is repeated a plurality of times. In the sheet processing apparatus according to claim 1 or 2,
The sheet processing apparatus according to claim 1, wherein a surface of the width direction aligning unit that contacts the sheet is a high friction part having a high coefficient of friction with respect to the sheet. In the sheet processing apparatus according to claim 1, 2 or 3,
The width direction aligning means is a pair of plate-like members, and a belt member that contacts the outer surface of the plate-like width direction of the plate-like member and moves the plate-like member in the paper carrying direction in conjunction with the movement of the surface of itself. A sheet processing apparatus comprising: a plurality of stretching members that stretch the belt member so that the surface of the belt member can move; and a driving unit that rotationally drives a roller member that is one of the plurality of stretching members. . Claims 1, 3 or in the sheet processing apparatus 4,
A sheet processing apparatus comprising a binding unit that performs a binding process on the sheet bundle. Image forming means for forming an image on paper;
An image forming apparatus comprising: a paper processing unit that performs a predetermined process on the paper image-formed by the image forming unit;
Examples sheet processing unit, according to claim 1, 2, 3, the image forming apparatus, characterized in that had 4 or using the sheet processing apparatus 5.

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