JP2012030965A - Sheet processing device, image forming system, and sheet processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet processing device, along with an image forming system and a sheet processing method, for moving a fold-enhancing roller to a position suitable for releasing a jam as described in this detailed statement, which can smoothly release the jam, for example, even when a home position is close to a sheet end subjected to the fold-enhancing.SOLUTION: The sheet processing device according to one embodiment includes: a fold-enhancing roller 409 for further fold-enhancing the folded sheet using a folding roller; a movement support unit 407 for moving the fold-enhancing roller 409 in the direction perpendicular to a sheet conveying direction; a motor 401 for driving the movement support unit 407; sensors 412, 413 for detecting the position of the movement support unit; and a control unit for controlling the support unit to move from a first position being the home position to a second position different from the first position after detecting the jam using the sensors 412, 413.

Description

  The present invention relates to a sheet processing apparatus, an image forming system, and a sheet processing method having processing functions such as sorting, stapling, and folding.

  In a saddle unit having a folding unit, there is known a paper processing apparatus that moves a folding roller to a home position when a cause abnormality is detected during a folding operation, and displays a message for prompting jam processing on a display means. Yes. However, when the home position position is close to the edge of the sheet to be folded, there is a problem that it is not sufficient for the jam release.

JP 2004-59306 A

  One of the problems that can be solved by the sheet processing apparatus, the image forming system, and the sheet processing method for moving the folding roller to a position suitable for releasing jam described in this specification is, for example, that the home position position is folded. Even when it is close to the edge of the paper, the jam is smoothly released.

  In order to achieve the above object, a sheet processing apparatus includes a folding roller that further folds a folded sheet by a folding roller, and a moving support that moves the folding roller in a direction orthogonal to the sheet conveying direction. A motor that drives the movement support unit, a sensor that detects a position of the movement support unit, and a first position that is a home position position after detecting a jam in the support unit from the first position. The gist is to include a control unit that controls to move to a second position different from the first position.

It is a block diagram of the paper post-processing apparatus in 1st embodiment. It is a perspective view which shows the shift mechanism in 1st embodiment. It is a perspective view which shows the shift tray raising / lowering mechanism in 1st embodiment. It is a perspective view which shows the paper discharge part to the shift tray in 1st embodiment. FIG. 5 is a plan view of the staple processing tray in the first embodiment when viewed from a direction perpendicular to the sheet conveyance surface. It is a perspective view which shows the staple processing tray in 1st embodiment, and its drive mechanism. It is a perspective view which shows the discharge | release mechanism of the sheet | seat bundle in 1st embodiment. It is a perspective view which shows the end surface binding stapler and moving mechanism in 1st embodiment. It is a perspective view which shows the diagonal rotation mechanism of the stapler in 1st embodiment. It is operation | movement explanatory drawing of the movement mechanism of the folding plate in 1st embodiment, and shows the state before entering into middle folding operation | movement. It is operation | movement explanatory drawing of the moving mechanism of the folding plate in 1st embodiment, and shows the state when returning to an initial position after middle folding. It is a figure which shows the staple processing tray and middle folding processing tray in 1st embodiment. It is a front view of the folding roller unit in the first embodiment. It is a side view of the fold-in roller unit in the first embodiment. It is a block diagram which shows control of the paper processing apparatus in 1st embodiment. It is a timing chart of the position movement of a folding roller showing a normal folding operation in the first embodiment. It is a timing chart of the position movement of the additional roller at the time of jam in the first embodiment. It is a timing chart of initial operation in case a sensor in a first embodiment is on. It is a timing chart of initial operation in case a sensor in a 1st embodiment is OFF. It is a timing chart of the position movement of the additional roller at the time of jam in the second embodiment.

Embodiments of a sheet processing apparatus will be described below with reference to the accompanying drawings.
(First embodiment)

  In the first embodiment, when a jam occurs, the folding roller moves from the normal home position position to a position farther from the end of the paper to be folded.

  FIG. 1 shows a configuration of an image forming system including a sheet post-processing apparatus PD and an image forming apparatus PR as a sheet processing apparatus according to the first embodiment. FIG. 1 shows the entire sheet post-processing apparatus PD and a part of the image forming apparatus PR.

  In FIG. 1, the paper post-processing device PD is attached to the image forming apparatus PR, and the recording medium discharged from the paper discharge port of the image forming device PR is guided to the introduction port 18 of the paper post-processing device PD. The paper passes through a conveyance path A having post-processing means for performing post-processing, a conveyance path B leading to the upper tray 201, a conveyance path C leading to the shift tray 202, a processing tray F for performing alignment and stapling (hereinafter, stapling processing). The paper is distributed by the branch claws 15 and 16 to the conveyance path D leading to the tray).

  The paper that is guided to the staple processing tray F through the transport paths A and D, and aligned and stapled by the staple processing tray is guided to the shift tray 202 by the branch guide plate 54 and the movable guide 55 that are deflecting means. C, configured to be distributed to a processing tray G for folding (hereinafter also referred to as a middle folding processing tray). The sheet that is folded in the middle folding processing tray G is strengthened by the folding roller unit 400 and is guided to the lower tray 203 through the conveyance path H. Further, a branch claw 17 is disposed in the conveyance path D and is held in the state shown in FIG. 1 by a low load spring. After the trailing edge of the sheet passes through the branching claw 17, at least the conveying roller 9 and the refeeding roller 8 among the conveying rollers 9 and 10 and the staple discharge roller 11 are reversed to guide the trailing edge to the sheet storage unit E. It stays and transports with the next paper. By repeating this operation, it is possible to carry two or more sheets in a superimposed manner.

  In the conveyance path A common to each of the upstream of the conveyance paths B, C, and D, an inlet sensor 301 that detects a sheet received from the image forming apparatus PR, an inlet roller 1, a punch unit 100, and a punch hopper 101 downstream thereof. The conveying roller 2 and the branching claws 15 and 16 are sequentially arranged. The branch claws 15 and 16 are held in the state shown in FIG. 1 by springs. When the solenoid is turned on, the branch claws 16 are rotated upward and the branch claws 16 are rotated downward, respectively. , C, and D.

  In the paper post-processing apparatus PD, punching (punch unit 100), paper alignment + edge binding (jogger fence 53, end surface binding stapler S1), paper alignment + saddle binding (jogger fence 53, saddle stitching stapler) is performed on the paper. S2), processing of paper sorting (shift tray 202), center folding (folding plate 74, folding roller 81, folding additional roller unit 400) and the like are performed.

  The shift tray paper discharge unit I located at the most downstream portion of the paper post-processing device PD includes a shift paper discharge roller 6, a return roller 13, a paper surface detection sensor 330, a shift tray 202, and a shift mechanism J shown in FIG. 3 has a shift tray lifting mechanism K shown in FIG. 2 is an enlarged perspective view of the main part showing the shift mechanism J, and FIG. 3 is an enlarged perspective view of the main part of the shift tray lifting mechanism K.

  The return roller 13 in FIGS. 1 and 3 contacts the paper discharged from the shift paper discharge roller 6 and abuts the rear end of the paper against the end fence 32 shown in FIG. The return roller 13 is rotated by the rotational force of the shift paper discharge roller 6. A tray rise limit switch 333 is provided in the vicinity of the return roller 13, and when the shift tray 202 is raised to push up the return roller 13, the tray rise limit switch 333 is turned on and the tray lifting / lowering motor 168 is stopped. This prevents overrun of the shift tray 202. Also, in the vicinity of the return roller 13, as shown in FIG. 1, a paper surface detection sensor 330 is provided as a paper surface position detecting means for detecting the paper surface position of the paper discharged from the shift tray 202 or the sheet bundle.

  The paper surface detection sensor 330 includes the paper surface detection lever 30 shown in FIG. 3, a paper surface detection sensor (for stapling) 330a, and a paper surface detection sensor (for non-staple) 330b. The paper surface detection lever 30 includes a contact portion 30a that rotates around the shaft portion of the lever and contacts the upper surface of the rear end of the paper loaded on the shift tray 202, and a fan-shaped blocking portion 30b.

  When the paper surface detection sensor (for stapling) 330a and the paper surface detection sensor (for non-stapling) 330b detect that the sheet stacking amount has reached a predetermined height, the shift tray 202 is lowered by a predetermined amount by driving the tray lifting / lowering motor 168. To do. Thereby, the paper surface position of the shift tray 202 is kept substantially constant.

  FIG. 4 is a perspective view illustrating a structure of a paper discharge unit to the shift tray 202.

  1 and 4, the shift paper discharge roller 6 has a drive roller 6a and a driven roller 6b. The driven roller 6b is instructed on the upstream side in the paper discharge direction, and is swingable in the vertical direction. It is supported rotatably at the free end of the. The driven roller 6b abuts on the driving roller 6a by its own weight or urging force, and the paper is nipped between the rollers 6a and 6b and discharged.

  When the bound sheet bundle is discharged, the open / close guide plate 33 is pulled upward and returned at a predetermined timing. This timing is determined based on the detection signal of the shift paper discharge sensor 303. . The stop position is determined based on the detection signal of the paper discharge guide plate opening / closing sensor 331 and is driven by the paper discharge guide plate opening / closing motor 167. The discharge guide plate opening / closing motor 167 is driven and controlled by turning on / off a discharge guide plate opening / closing limit switch 332.

  The configuration of the staple processing tray F that performs the staple processing will be described.

  FIG. 5 is a plan view of the staple processing tray F viewed from a direction perpendicular to the sheet conveyance surface, FIG. 6 is a perspective view showing the staple processing tray F and its driving mechanism, and FIG. 7 shows a sheet bundle discharging mechanism. It is a perspective view. First, as illustrated in FIG. 6, the sheets guided to the staple processing tray F by the staple discharge roller 11 are sequentially stacked on the staple processing tray F. In this case, vertical alignment (paper conveyance direction) is performed by the tapping roller 12 for each sheet, and alignment in the horizontal direction (direction perpendicular to the sheet conveyance direction-paper width direction) is performed by the jogger fence 53. The end face binding stapler S1 is driven by a stapling signal from the control unit between the end of the job, that is, from the last sheet of the sheet bundle to the first sheet of the next sheet bundle, and the binding process is performed. The sheet bundle subjected to the binding process is immediately sent to the shift discharge roller 6 by the discharge belt 52 provided with the discharge claw 52a, and is discharged to the shift tray 202 set at the receiving position.

  As shown in FIG. 7, the release claw 52a detects the home position by the release belt HP sensor 311, and the release belt HP sensor 311 is turned on / off by the release claw 52a. Two discharge claws 52a are arranged at opposing positions on the outer periphery of the discharge belt 52, and the sheet bundle stored in the staple processing tray F is moved and conveyed alternately. Further, if necessary, the discharge belt 52 is rotated in the reverse direction, and the discharge claw 52a waiting to move the paper bundle and the back side of the discharge claw 52a on the opposite side of the paper bundle stored in the staple processing tray F It is also possible to align the tips in the transport direction. The discharge claw 52a also functions as a means for aligning the sheet bundle in the sheet conveyance direction.

  As shown in FIG. 5, a discharge roller 56 is arranged and fixed on the drive shaft of the discharge belt 52 driven by the discharge motor 157 symmetrically with respect to the discharge belt 52 and its drive pulley 62 at the alignment center in the paper width direction. Has been. Further, the peripheral speed of these discharge rollers 56 is set to be higher than the peripheral speed of the discharge belt 52.

  As shown in FIG. 6, the tapping roller 12 is given a pendulum motion by the tapping solenoid 170 about the fulcrum 12 a and intermittently acts on the sheet fed to the staple processing tray F to push the sheet against the rear end fence 51. Hit it. The hitting roller 12 rotates counterclockwise. The jogger fence 53 is driven via a timing belt by a jogger motor 158 capable of forward and reverse rotation, and reciprocates in the paper width direction.

  In FIG. 8, the end-face binding stapler S1 is driven via a timing belt by a stapler moving motor 159 capable of forward and reverse rotation, and moves in the paper width direction in order to bind a predetermined position of the paper edge. At one end of the moving range, there is a stapler movement HP sensor 312 that detects the home position of the end surface binding stapler S1, and the binding position in the paper width direction is controlled by the amount of movement of the end surface binding stapler S1 from the home position. The Further, as shown in the perspective view of FIG. 9, the end-face binding stapler S1 is configured so that the needle driving angle can be changed parallel to or obliquely with respect to the end of the sheet, and further, only the binding mechanism portion of the stapler S1 is set at a predetermined angle at the home position. It is configured so that the needle can be easily exchanged by rotating it diagonally. The stapler S1 is rotated obliquely by the oblique motor 160, and when the staple replacement position sensor 313 detects that the stapler S1 has reached a predetermined oblique angle or reached the needle replacement position, the oblique motor 160 stops. When the diagonal strike is finished or the needle exchange is finished, the original position is rotated to prepare for the next staple.

  In the saddle stitching stapler S2, as shown in FIGS. 1 and 5, the distance from the rear end fence 51 to the needle striking position of the saddle stitching stapler S2 corresponds to a half of the conveyance direction length of the maximum sheet size that can be saddle stitched. Arranged as described above, and two symmetrically arranged with respect to the alignment center in the paper width direction, are fixed to the stay 63. When performing saddle stitching, the direction perpendicular to the sheet conveyance direction is aligned by the jogger fence 53, and the sheet conveyance direction is aligned by the trailing edge fence 51 and the hitting roller 12, and then the discharge belt 52 is driven to release the nail. At 52a, the rear end of the sheet bundle is lifted so that the central portion in the sheet bundle conveyance direction is positioned at the binding position of the saddle stitching stapler S2, and stopped at this position to execute the binding operation. The bound sheet bundle is conveyed to the middle folding processing tray G side and folded in half.

  In the figure, reference numeral 64a denotes a front side plate, 64b denotes a rear side plate, and reference numeral 310 denotes a paper presence / absence sensor that detects the presence / absence of paper on the staple processing tray F.

  10 and 11 are explanatory views of the operation of the moving mechanism of the folding plate 74 for performing the middle folding.

  The folding plate 74 is supported by loosely fitting the long hole portions 74a to the two shafts 64c erected on the front and rear side plates 64a and 64b. Further, the shaft portion 74b erected from the folding plate 74 is loosely fitted into the long hole portion 76b of the link arm 76, and the link arm 76 swings about the fulcrum 76a, whereby the folding plate 74 is shown in FIGS. 11 reciprocates left and right. That is, the shaft portion 75b of the folding plate driving cam 75 is loosely fitted in the long hole portion 76c of the link arm 76, and the link arm 76 swings due to the rotational movement of the folding plate driving cam 75. 12, the folding plate 74 reciprocates in a direction perpendicular to the lower bundle conveyance guide plate 91 and the upper bundle conveyance guide plate 92.

  The folding plate drive cam 75 is rotated in the direction of the arrow in FIG. 10 by the folding plate drive motor 166. The stop position is determined by detecting both end portions of the half-moon shaped blocking portion 75a by the folding plate HP sensor 325.

  FIG. 10 shows the home position position completely retracted from the sheet bundle accommodation area of the processing tray G. When the folding plate drive cam 75 is rotated in the direction of the arrow, the folding plate 74 moves in the direction of the arrow and protrudes into the sheet bundle accommodation area of the processing tray G. FIG. 11 shows a position where the center of the sheet bundle of the processing tray G is pushed into the nip of the folding roller 81. When the folding plate drive cam 75 is rotated in the direction of the arrow, the folding plate 74 moves in the direction of the arrow and retracts from the sheet bundle accommodation area of the processing tray G.

  In the first embodiment, it is assumed that the sheet folding is performed by folding the sheet bundle. However, the present invention can be applied to the case of folding one sheet. In this case, since only one sheet does not require saddle stitching, when one sheet is discharged, the sheet is fed to the middle folding processing tray G side, folded by the folding plate 74 and the folding roller, and discharged to the lower tray 203. To do.

  Next, the folding roller unit will be described. As shown in FIG. 1, a folding roller unit 400 is provided on the conveyance path H between the folding roller 81 and the paper discharge roller 83. The sheet bundle folded by the folding plate 74 is pushed into the nip of the folding roller 83 to make a crease, and then the crease is strengthened by the folding roller unit 400.

  As shown in the front view of FIG. 13 and the side view of FIG. 14, the folding roller unit 400 includes a folding roller 409, a folding roller support mechanism, and a folding roller driving mechanism. The driving mechanism of the folding roller includes a driven pulley 402, a driving pulley 404, an endless timing belt 403 stretched between the pulleys 402 and 404, and a pulse motor 401 that rotationally drives the timing belt 403. (FIG. 14).

  The support mechanism for the folding roller 409 is coupled to the timing belt 403, and the moving support unit 407 that moves integrally, the guide unit 405 that the moving support unit 407 slides to regulate the moving direction, and the moving support unit 407. The upper guide plate 415 that extends to the anti-folding roller side, restricts the inclination of the folding roller 409 and prevents the guide portion 405 from bending, the folding roller support portion 408, and the folding roller 409 in the sheet bundle folding direction. It is composed of an elastic material (coil spring in FIG. 13) 411 as elastic urging means that urges elastically (downward in FIGS. 13 and 14). The support mechanism is disposed in a direction perpendicular to the paper transport direction, and the drive mechanism folds the roller 409 in the support mechanism in the installation direction of the support mechanism.

  The rotational drive of the pulse motor 401 is transmitted to the moving support portion 407 coupled to the timing belt 403 by the timing belt 403 stretched between the driven pulley 402 and the driving pulley 404, and the moving support portion 403 is a guide portion. It is guided by 405 and moves while sliding in the thrust direction of the guide portion 405. Between the movement support portion 407 and the upper guide plate 415, there is a bending prevention portion, which is supported by the movement support portion 407 in a rotatable state and is in a roller shape. Therefore, the guide portion is integrated with the movement support portion 407. 405 can be moved in the axial direction. The folding roller 409 is disposed between the movement support portion 407 and the lower guide plate 416, and has a friction portion 410 on the outer periphery of the folding roller 409. The folding roller 409 moves reciprocally.

  The rotation shaft of the folding roller 409 is supported by a folding roller support unit 408, and the folding roller support unit 408 is supported in a state where it can move in the vertical direction while sliding with the moving support unit 407. . Further, the folding roller support portion 408 is pressed toward the lower guide plate 416 from the moving support portion 407 by the elastic material 411. As a result, the folding roller 409 can move in the thrust direction of the guide unit 405 integrally with the movement support unit 407, and the folding roller 409 is always pressed toward the lower guide plate 416 by the elastic member 411. And move up and down. Further, in the thrust direction of the guide portion 405, there are a front position detection sensor 412 and a rear position detection sensor 413 as detection means for detecting the position of the movement support portion 407. When the detection plate 417 of the movement support unit 407 is positioned at the position before the position detection sensor 412 and the position after the position detection sensor 413, the position detection sensor front and rear 412 and 413 detect the movement support unit 407. The sheet bundle detection sensor 414 detects the sheet bundle conveyed to the folding roller unit 400.

  The position of the home position of the folding roller 409 is detected by the position detection sensor 413. After the sheet bundle is conveyed to a predetermined position and the folding operation is stopped, the folding roller 409 is moved from the position sensor after 413 to the position before the position sensor 412. At this time, pulses are counted, and if the folding roller 409 is not detected by the position detection sensor front 412 even after the predetermined pulse counting, there is an abnormality during the movement of the folding roller 409 (mechanism lock, stop due to insufficient driving torque, motor Step out, paper jam).

  When it is determined that there is an abnormality, the pulse motor 401 is reversely rotated and returned to the direction 413 after the position detection sensor. At this time, a paper jam display is displayed on the display unit.

  FIG. 15 is a block diagram illustrating control of the sheet processing apparatus. The control unit 1500 includes a CPU 1501 and an I / O interface 1502. Signals from the switches and the like of the control panel of the image forming apparatus PR and the sensor 1503 are input to the CPU 1501 via the I / O interface 1502. The CPU 1501 controls driving of the solenoid 1504 and the motor 1505 based on the input signal.

  For example, an inlet sensor 301, a shift paper discharge sensor 303, a paper surface detection sensor 330, a paper discharge guide plate opening / closing sensor 331, a paper presence sensor 310, a discharge belt HP sensor 311, a stapler movement HP sensor 312, a needle replacement position sensor 313, a folding plate Signals from the HP sensor 325, the position detection sensor front 412, the position detection sensor back 413, and the sheet bundle detection sensor 414 are input to the CPU 1501.

  For control of the sheet post-processing device PD, abnormality detection control, and display control for the display unit 1507, the CPU 1501 executes a program written in the storage unit 1506. Further, display control of the operation display unit in the image forming apparatus PR is controlled by a CPU included in the image forming apparatus PR in accordance with a control output from the CPU 1501.

  FIG. 16 is a timing chart of the position movement of the folding roller 409 showing a normal folding operation. The home position position of the folding roller 409 is at a position where A-STEP is inserted outside the position of the sensor 413 (left side in FIG. 16). At the time of folding, the folding roller 409 moves to B-STEP after detection by the sensor 413, then turns back and returns to the left, stops again when detected by the sensor 413, and enters A-STEP. Turns on when the sensor 413 detects the detection plate 417 (FIGS. 13 and 14), and turns off when the detection plate 417 is not detected.

  Hereinafter, a series of flow from the occurrence of an abnormality will be described. Even if the pulse motor 402 is driven and the folding roller 409 is moved in the direction 413 after the position detection sensor, if the position detection sensor 413 is not turned on within a predetermined time, a paper jam occurs and an abnormality occurs. Will be. At this time, the image is displayed on the operation unit of the display image forming apparatus PR indicating that a paper jam has occurred. In addition, the sheet post-processing apparatus PD may include a display unit and display on the display unit 1507.

  In order to shorten the folding time, the amount of movement of the folding roller 409 should be as small as possible. For this reason, when the jam is released, the folding roller 409 may not be moved to a position sufficiently away. At the time of return in the case of jamming, the position of the folding roller 409, the state of the paper, etc. are not known, so the return is made to the retracted position at a low speed with large torque.

  FIG. 17 is a timing chart of the position movement of the folding roller 409 at the time of jam according to the first embodiment. At the time of jamming, the sensor 413 detects the detection plate 417 provided in the movement support unit 407, confirms the position, and stops at C-STEP, which has a larger number of steps than the normal home position position. Since both the home position position and the retracted position are positions detected by the sensor 413, a highly reliable position can be taken.

  During normal operation, the folding operation time is prioritized and the folding roller 409 is returned to the normal home position. On the other hand, when the jam occurs, priority is given to the cancellation of the jam, and control is performed to move the folding roller 409 to the retracted position that has escaped sufficiently outside the home position position. After the jam is released, the folding roller 409 is moved to the normal home position by an initial operation. The initial operation here means returning to the home position once via the sensor 413 because it is not known at which position the folding roller 409 is stopped at the time of jam or the like.

  FIG. 18 is a timing chart of the initial operation when the sensor 413 is on. When the detection plate 417 is detected and the sensor 413 is on, the sensor 413 is turned off once, and then the sensor 413 performs an operation of returning the folding roller 409 to the home position after detecting the on. First, when the sensor 413 is on, the folding roller 409 is moved to the right, and when the sensor 413 is detected to be off, the A-STEP is moved to the right. Thereafter, the folding roller 409 is moved to the left, and when the sensor 413 is detected to be on, the C-STEP is entered to the left and the home position is returned.

  FIG. 19 is a timing chart of the initial operation when the sensor 413 is off. When the detection plate 417 is not detected and the sensor 413 is OFF, the folding roller 409 is moved to the left. When the sensor 413 is detected ON, C-STEP is entered and the home position is returned.

With the above configuration, when a jam occurs, it can be moved to a suitable position according to the state. In other words, if the home position position is close to the edge of the sheet to be folded, and that position is not sufficient for jam release, it can be moved to a position suitable for jam release. When the home position position is close to the end of the sheet to be folded in order to prioritize the processing time, it is possible to fold the roller 409 to a position where there is a sufficient margin during jamming and move the roller 409 to the retracted position. Also, when the fold is started with a low-speed drive with a large torque from the beginning and can be stopped with a small number of slowdown steps when returning, the home position position is as close as possible to the edge of the paper to be folded. Is particularly effective.
(Second embodiment)

  In the second embodiment, when a jam occurs, the folding increase roller moves to a position farther from the folding position. The same components as those in the first embodiment are denoted by the same reference numerals.

  FIG. 20 is a timing chart of the position movement of the folding roller 409 at the time of jam according to the second embodiment. When jamming, the folding roller 409 is moved to the right, the sensor 412 detects the detection plate 417 provided on the movement support 407, confirms the position, and stops at C-STEP, which has more steps than the folding position. .

  With the above configuration, when a jam occurs, it can be moved to a suitable position according to the state. In other words, if the home position position is close to the edge of the sheet to be folded, and that position is not sufficient for jam release, it can be moved to a position suitable for jam release. When the home position position is close to the end of the sheet to be folded in order to prioritize the processing time, it is possible to fold the roller 409 to a position where there is a sufficient margin during jamming and move the roller 409 to the retracted position. Also, when the fold is started with a low-speed drive with a large torque from the beginning and can be stopped with a small number of slowdown steps when returning, the home position position is as close as possible to the edge of the paper to be folded. Is particularly effective. Further, when jamming, when the folding roller 409 is closer to the folding position than the home position, the jam processing time can be shortened.

  In addition, the above-mentioned embodiment may combine not only an individual aspect but 1st embodiment and 2nd embodiment.

  Although several embodiments have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. In these embodiments and modifications thereof, the scope of the invention is included in the sheet, and is also included in the invention described in the claims and the equivalents thereof.

400 Folding roller unit 401 Pulse motor 405 Guide part 407 Movement support part 408 Folding roller support part 409 Folding roller 411 Elastic material 412 Position detection sensor front 413 Position detection sensor rear 414 Paper bundle detection sensor 417 Detection plate 1500 Control part 1501 CPU
1503 Sensor G Middle-fold processing tray PD Paper post-processing device PR Image forming device

Claims (9)

A folding roller for further folding the folded paper with the folding roller;
A moving support portion for moving the folding roller in a direction orthogonal to the paper conveying direction;
A motor for driving the movement support unit;
A sensor for detecting a position of the moving support unit;
A control unit for controlling the support unit to move from a first position which is a home position position to a second position different from the first position after detecting a jam by the sensor;
A sheet processing apparatus comprising:   The sheet processing apparatus according to claim 1, wherein the second position is a position farther from an end of the sheet than the first position.   The sheet processing apparatus according to claim 1, wherein the motor is a pulse motor, and when a jam occurs, the second position is a position that moves by a number of steps different from the first position.   The sheet processing apparatus according to claim 1, further comprising: a display unit that displays a message that prompts jam processing when the sensor detects that an abnormality has occurred during operation of the folding roller. A folding roller for further folding the folded paper with the folding roller;
A moving support portion for moving the folding roller in a direction orthogonal to the paper conveying direction;
A motor for driving the movement support unit;
A sensor for detecting a position of the moving support unit;
A control unit for controlling the support unit to move to a second position different from the first position from a first position which is a folding position of the moving support unit after detecting a jam with the sensor;
A sheet processing apparatus comprising:   The sheet processing apparatus according to claim 5, wherein the second position is a position farther from an end portion of the sheet when the sheet is folded than the first position.   The sheet processing apparatus according to claim 5, wherein the motor is a pulse motor, and when the jam occurs, the second position is a position that moves by a number of steps different from the first position. A folding roller for further folding the folded paper with the folding roller;
A moving support portion for moving the folding roller in a direction orthogonal to the paper conveying direction;
A motor for driving the movement support unit;
A sensor for detecting a position of the moving support unit;
A control unit for controlling the support unit to move from a first position which is a home position position to a second position different from the first position after detecting a jam by the sensor;
A paper processing apparatus having
An image forming apparatus including an image forming unit that forms an image on a sheet based on input image information, and a sheet feeding unit that supplies the sheet to the image forming unit;
An image forming system comprising: The folding roller further folds the folded paper, and the roller further folds.
Supporting the folding roller with a moving support portion;
A motor drives the movement support part,
A sensor detects the position of the moving support part,
A paper processing method, wherein after the jam is detected by the sensor, the support unit is controlled to move from a first position which is a home position position to a second position different from the first position.

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