JP2013039997A - Paper processing apparatus and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable prestacking using a compact apparatus.SOLUTION: The paper processing apparatus includes: an alignment tray 32 including a jogger fence 33, a reference fence 35 and a stapler 31 for performing alignment and binding processing on sheets; a second conveying roller which conveys a sheet carried in along a shift processing path 2 to the alignment tray 32; and a second sheet housing portion 5 which is branched on the upstream side of the second conveying roller in the shift processing path 2 and to which a sheet is retreated by reversing the second conveying roller. When the sheet is retreated to the second sheet housing portion 5, the second conveying roller 23 guides the front end side of the sheet from the upper surface side of a conveyance guide plate 38 to the outside of the apparatus, and reverses the conveyance direction before the rear end of the sheet passes through the second conveying roller 23 to convey the sheet to the second sheet housing portion 5.

Description

  The present invention relates to a sheet processing apparatus and an image forming system, and in particular, a process set in advance for a sheet-like recording medium (hereinafter, simply referred to as “sheet”) such as a sheet, a recording sheet, a printing sheet, and a transfer sheet. The present invention relates to an image forming system including a sheet processing apparatus that performs image processing, an image forming apparatus that forms an image on a sheet, and a sheet processing apparatus connected to the image forming apparatus.

  A sheet processing apparatus that performs stapling on an image-formed sheet discharged from the image forming apparatus is referred to as a sheet post-processing apparatus because it performs processing on an image-formed sheet. Then, during the stapling process, since the tray to be accommodated is closed even if the next sheet to be conveyed is conveyed, it is necessary to wait for the next sheet until the tray is opened. In this way, when the next sheet waits, the productivity decreases accordingly. As a known technique for solving this problem, one or more sheets are temporarily retracted so that the next sheet does not enter the stapling tray while the sheet is being stapled. There is known a technique for providing the path (for example, Patent Document 1).

  The technique described in Patent Document 1 includes a pre-stack unit that stacks a sheet-like medium that is disposed on a first conveyance path and is conveyed along the first conveyance path, and a sheet that has passed through the first conveyance path. A staple unit for stapling the sheet-like medium, a control unit for controlling the conveyance of the sheet-like medium, and a folded sheet-like medium folded into a predetermined form joined to the first conveyance path downstream of the pre-stacking unit. The control means stacks the succeeding sheet-like medium following the folded sheet-like medium on the pre-stacking means, and conveys both the folded sheet-like medium and the succeeding sheet-like medium. The stack is released at a timing to enable it and both sheet-like media are conveyed to the stapling means.

  In this technique, the retreat path constituting the prestacking means is provided adjacent to and substantially parallel to the first transport path for guiding the sheet to the sheet alignment tray. With this configuration, while the stapling process is performed on the paper, the next transported paper waits on the retraction path and receives subsequent paper until the stapling process is completed on the retraction path. There is no need to wait for image formation. As a result, it is possible to prevent a decrease in productivity caused by standby for image formation. However, such a retracting path requires a length for storing the sheet in order to retract the sheet, and the size of the machine cannot be reduced accordingly. It is generally referred to as pre-stacking that the conveyed sheet is made to wait on the retract path and the subsequent sheet is received until the staple process is completed on the retract path.

  Therefore, a problem to be solved by the present invention is to enable prestacking with a small device.

  In order to solve the above-mentioned problem, the first means includes a paper stacking means provided with a processing means for performing a preset process on the paper, and a paper that has been carried in along the transport path. And a retreat path that branches off upstream of the conveying means in the conveying path and reverses the conveying means to retract the paper before conveying the paper to the stacking means. In the sheet processing apparatus, when the sheet is retracted to the retract path, the transport unit guides the leading end side of the sheet to the outside of the apparatus, reverses the transport direction before the rear end of the sheet passes the transport unit, and The sheet is conveyed to a retreat path.

  The second means is characterized by an image forming system including the sheet processing apparatus according to the first means.

  According to the present invention, it is possible to enable prestacking with a small apparatus.

1 is a system configuration diagram illustrating a schematic configuration of an image forming system including an image forming apparatus and a sheet post-processing apparatus according to an embodiment of the present invention. It is operation | movement explanatory drawing which shows the prestack operation | movement in embodiment of this invention. It is a figure which shows the structure of the paper accommodating part in embodiment of this invention. It is operation | movement explanatory drawing which shows operation | movement of a 2nd branch nail | claw and a paper discharge guide plate. It is a figure which shows the example which provided the space which retracts | saves at the time of discharge guide open | release in the lower surface of a proof tray. FIG. 10 is a diagram illustrating an example in which a length of a sheet storage unit in a conveyance direction is set to be shorter than a maximum sheet length. FIG. 6 is a diagram illustrating an example in which a sheet conveyance direction in a sheet storage unit is set to be a predetermined angle upward with respect to an inclination angle of a sheet alignment tray. FIG. 6 is a diagram illustrating an example in which a sheet storage portion is bent in a substantially U shape when viewed from a conveyance direction. 1 is a block diagram illustrating a control configuration of an image forming system including a sheet post-processing apparatus and an image forming apparatus according to an embodiment of the present invention.

  In the present invention, when the sheet is retracted to the retracting path and prestacked, the leading end side of the sheet is guided out of the apparatus by the transporting unit, the transporting direction is reversed before the trailing end of the sheet passes through the transporting unit, and the retracting is performed. It is characterized in that a sheet is conveyed to the path and prestacked, and a conveyance path for reversing is unnecessary.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a system configuration diagram showing a schematic configuration of an image forming system including an image forming apparatus and a sheet post-processing apparatus according to an embodiment of the present invention. In the present embodiment, the sheet processing apparatus performs post-processing on a sheet on which an image has been formed by the image forming apparatus.
As can be seen from FIG. 1, the image forming system according to the present embodiment includes an image forming apparatus PR and a sheet post-processing apparatus Fin connected to the subsequent stage of the image forming apparatus PR.

  The image forming apparatus PR includes an image forming engine that forms an image on a sheet, and a control unit that converts input image data into output image data and controls the image forming engine to output an image. Yes. There are various image forming methods, in other words, image forming engine methods, but most of the image engine methods used in personal use are, for example, the electrophotographic method and the ink jet method.

  The paper post-processing device Fin executes various post-processing such as punching, binding, alignment, and bookbinding on the image-formed paper. The sheet post-processing device Fin includes an introduction path 1 that receives an image-formed sheet carried from the image forming apparatus PR, a shift processing path 2 that performs shift processing, a staple processing path 3 that performs alignment, stapling, and the like. Have

  An inlet sensor 11 and an inlet roller 12 are arranged in the introduction path 1 from the upstream side in the paper conveyance direction. The entrance sensor 11 detects that the sheet is carried into the sheet post-processing apparatus Fin, and the entrance roller 12 conveys the sheet carried from the image forming apparatus PR side to the downstream side of the sheet post-processing apparatus Fin. The shift processing path 2 is provided with first and second transport rollers 21 and 23 on the upstream side and the downstream side, respectively, between the transport rollers 21 and 23, and on the downstream side of the second transport roller 23. A conveyance sensor 24 is disposed immediately before the upstream side. The sheet is detected by the conveyance sensor 24 and then conveyed to the staple processing path 3. A first branching claw 22 for guiding the sheet to the second sheet storage unit 5 is provided on the upstream side of the second conveyance roller 23 in the shift processing path 2, and is downstream of the second conveyance roller 23. Is provided with a second branch claw 41 for guiding the sheet to the first sheet storage unit 4.

  In the sort mode in which the paper is sorted by set, the first transport roller 21 having a shift mechanism is moved by a fixed amount in the direction perpendicular to the transport direction during transport of the paper by a driving unit (not shown). Along with this movement, the sheet is shifted by a certain amount moved.

  A stapler 31 that moves parallel to the trailing edge of the sheet (in a direction orthogonal to the sheet conveying direction) to the end position of the staple processing path 3 and performs the binding process at a predetermined staple position at the trailing edge of the sheet, and the sheet conveying direction. And the alignment tray 32 which aligns the direction orthogonal to a conveyance direction is arrange | positioned. The alignment tray 32 includes a jogger fence 33 that aligns the direction orthogonal to the sheet conveyance direction, a reference fence 35 that aligns the sheet conveyance direction (rear end), and a return roller 34.

  The jogger fence 33 is composed of a pair of plate-like members that are close to and away from each other in the direction perpendicular to the transport direction on the alignment tray 32, and is orthogonal to the paper transport direction with respect to the paper P discharged on the alignment tray 32. The both sides of the paper are sandwiched at predetermined positions and are aligned in a direction (width direction) perpendicular to the paper transport direction. There is also a jogger fence of a type in which one fence is fixed and the other fence is moved close to and away from the one fence to align the direction orthogonal to the paper transport direction.

  The reference fence 35 is provided at the rear end of the alignment tray 32 (on the side where the stapler 31 is disposed), and aligns the paper transport direction when the paper rear end abuts. Gravity alone does not necessarily cause the paper to hit the reference fence, and even if the paper hits the reference fence 35, the trailing edge does not always align due to the effect of friction. A return roller 34 is provided above the alignment tray 32 to move the paper to the reference fence 35 side and abut the rear end of the paper against the reference fence.

  FIG. 2 is an operation explanatory diagram showing a so-called prestack operation in the present embodiment. Hereinafter, when related to this operation, the configuration and operation of the sheet post-processing apparatus Fin in the present embodiment will be described with reference to a diagram showing the operation.

  When the staple mode for binding a bundle of sheets composed of a plurality of sheets is selected, the sheets are sent to the alignment tray 32. Therefore, the second branch claw 41 is switched so as to feed the sheet to the staple processing path 3 side. In the first job (first copy), since no sheets are collected on the alignment tray 32, the branching claw 41 opens the staple processing path 3 side, and both the first copy sheet P11 and the second copy sheet P12 are used. Guide to the staple processing path 3 side. Similarly, the subsequent sheets are similarly transported from the staple processing path 3 to the alignment tray 32, stacked on the alignment tray 32, and after the alignment operation is completed, are stapled by the stapler 31.

  The discharge port portion to the discharge tray 61 has a pair structure in which the discharge drive roller 36 and the discharge driven roller 37 sandwich and discharge a sheet or sheet bundle. This is a contact / separation operation of a paper discharge guide plate 38 having a paper discharge driven roller 37 with respect to the paper discharge drive roller 36, and a closed state where paper or a paper bundle can be held and discharged can be selectively selected. After the stapling process is completed, the paper is nipped and discharged.

  Meanwhile, the image forming apparatus PR executes the image forming operation of the second job (second copy), and the sheet of the second job is conveyed from the image forming apparatus PR. At that time, since the processing of the sheet bundle for the first job is not completed, the first sheet P21 of the second job is sent to the first sheet storage unit 4. That is, when the final paper P12 of the first job passes through the shift processing path 2, the second branching claw 41 is switched to close the staple processing path 3 side and open the first paper storage unit 4 side ( FIG. 2 (a)). As a result, the first sheet P 21 of the second job is guided to the first sheet storage unit 4 side and is sent to the first sheet storage unit 4 by the second transport roller 23.

  When the first sheet P21 of the second job is transported to the first sheet storage unit 4 and the rear end of the sheet P21 passes through the first branching claw 22 (FIG. 2B), the second transport is performed. The roller 23 is reversely rotated, and at the same time, the first branch claw 22 is switched so that the second paper storage unit 5 side is opened. As a result, the rear end of the sheet is guided to the second sheet storage unit 5 side (FIG. 2C), and the sheet P21 is retained in the second sheet storage unit 5 (FIG. 2D). Thus, when the next paper P22 is transported, the second transport roller 23 superimposes the leading edges so that the paper stays in the second paper storage unit 5 together with the transport rollers 5a, 5b, and 5c. P21 can be sent out and conveyed to the staple conveyance path 3 (FIG. 2E). The paper bundles P21 and P22 of the second job conveyed to the staple conveyance path 3 are bound by the stapler 31 in the same manner as the paper bundles P11 and P12 of the first job (FIG. 2 (f)), and the paper of the first job The sheets are discharged onto the bundles P11 and P12.

  By repeating this operation, it is possible to convey two or more sheets in a superimposed manner and discharge them to the staple processing path 3. At that time, the re-conveyance start timing of the sheet retracted to the sheet storage unit 5 is determined based on the detection timing of the leading edge sensor 11 output from the image forming apparatus PR.

As shown in FIG. 3, the first paper storage unit 4 includes an upper surface 38 b of the paper discharge guide plate 38 and a lower surface 25 a of the proof tray 25. The proof tray 25 is a tray on which the sheets conveyed through the upper conveyance path 25c branched from the shift conveyance path 2 are discharged and accumulated. The paper on which the image is formed by the image forming apparatus PR is discharged to the proof tray 25 without any post-processing. When the sheet is transported to the upper transport path 25c, it is introduced from the introduction path 1 when the upper transport path 25c side is opened by the selection operation of the third branch claw 25b located on the most upstream side of the shift transport path 2. FIG. 4 is an operation explanatory diagram showing the operation of the second branching claw 41 and the paper discharge guide plate 38. The second branch claw 41 and the paper discharge guide plate 38 are supported so as to be swingable around the fulcrums 41a and 38a. The fulcrum 41a of the second branch claw 41 is provided at the end on the downstream side in the paper transport direction, and the fulcrum 38a of the paper discharge guide plate 38 is provided at the end on the upstream side in the paper transport direction. Both are driven by a drive mechanism (not shown). As the drive mechanism, a motor and a speed reduction mechanism, a solenoid, or the like is used.

  FIG. 4A shows an example in which the second branch claw 41 and the paper discharge guide plate 38 are configured to operate in conjunction with each other. When the sheets are conveyed and stacked on the alignment tray 32, the sheet discharge driving roller 36 and the sheet discharge driven roller 37 are separated until a predetermined post-processing is performed on the sheet bundle stacked on the alignment tray 32. The second branch claw 51 is tilted to the side that opens the path on the sheet alignment tray side. When a sheet is received from the image forming apparatus PR in this state, the received sheet is conveyed to the alignment tray 32. When the paper for the next job is discharged to the alignment tray 32 when post-processing is performed on the paper bundle in this way, the paper bundle collides with the unprocessed paper bundle and disturbs the alignment of the paper bundle. It is necessary to interrupt acceptance from the image forming apparatus PR. When the second branching claw 41 and the paper discharge guide plate 38 operate in this manner, it is necessary to wait for the paper for the next job to be loaded, and this standby is performed by the image forming apparatus PR. Since the image forming operation is interrupted, the production efficiency is lowered by the amount of the interruption.

  On the other hand, FIG. 4B shows an example in which the second branch claw 41 and the paper discharge guide plate 38 are configured to operate independently. When the drive mechanism for the second branch claw 41 and the discharge guide plate 38 can be operated independently as described above, the discharge guide plate 38 is positioned at a position where the discharge driven roller 37 is separated from the drive roller 36. Even if it does, the 2nd branch claw 41 can be brought down to the side which closes the alignment tray 32 side. With this configuration, when the sheet bundle of the previous job is accumulated on the alignment tray 32 and post-processing is being performed, the first sheet of the next job can be guided to the first sheet storage unit 4. .

  The switching of the second branching claw 41 is performed after a predetermined time has elapsed after the trailing edge of the last sheet of the previous job has passed through the second conveyance roller 23, and the path to the first sheet storage unit 4. Can be received from the image forming apparatus PR until the post-processing is completed.

  FIG. 5 is a view showing an example in which a space for retreating when the discharge guide is opened is provided on the lower surface of the proof tray. FIG. 5A shows a state when the discharge guide is opened, and FIG. Each state when closed.

  As described above, the paper discharge guide plate 38 is supported so as to be swingable around the fulcrum 38a. When the staple mode is selected, the paper discharge guide plate 38 does not block the conveyance of the paper received in the alignment tray 32. Is open to the fullest. In other words, the paper discharge guide plate 38 is opened by an opening / closing motor (not shown) up to a height at which the conveyed paper does not touch. When the size of the machine is reduced, when the paper discharge guide plate 38 is opened, it interferes with the lower surface of the proof tray 25, so that a large space between the paper discharge driving roller 36 and the paper discharge driven roller 37 cannot be secured. As a result, only a small number of sheets can be stacked on the alignment tray 32.

  Therefore, in the present embodiment, a space 25b is provided on the lower surface 25a of the proof tray 25 so that the paper discharge guide plate 38 lifted by the opening / closing motor can be retracted into the space 25a. As a result, while the paper for the first job is being conveyed to the alignment tray 32, the paper discharge guide plate 38 is retracted into the space 25a, and the paper discharge driving roller 36 and the paper discharge driven roller that are largely opened are retracted. It is sent between 37. When the final sheet for the first job is conveyed onto the alignment tray 32, the sheet discharge guide plate 38 is closed and separated from the proof tray 25, and a space 4a for receiving sheets in the first sheet storage unit 4 is formed. It is formed. In this state, the second branching claw 41 opens the path on the first sheet storage unit 4 side and closes the path on the sheet alignment tray 3 side, so that the next sheet conveyed is the first sheet. The paper is guided to the storage unit 4 and stored in the space 4a. Accordingly, it is possible to reliably cope with the accommodation and processing of a large number of sheet bundles and the next transport sheet retracting operation.

  FIG. 6 is a diagram illustrating an example in which the length of the paper storage unit in the transport direction is set to be shorter than the maximum paper length. The stop position of the paper stored in the first paper storage unit 4 is determined based on the detection timing of the transport sensor 24, and stops at a preset position A before the rear end of the paper passes the transport roller 23. The first paper storage unit 4 has no guide downstream from the terminal end B of the paper discharge guide plate 38, and the transport distance between AB is set to be shorter than the maximum paper length in the transport direction. The paper that has jumped out from the end portion B hangs down by its own weight. When the amount of sag is large, the discharge port composed of the pair of discharge drive rollers 36 and 37 is blocked, and the alignment of the sheet bundle on the alignment tray 32 is disturbed or the discharge failure of the sheet bundle is caused. Therefore, it is necessary to prevent sagging.

In order to prevent the paper from drooping from the terminal end B, it is desirable that the paper length l protruding from the terminal end B is shorter than the paper width D. Therefore, if the maximum sheet length is L,
l <D
l = L-AB
∴AB> LD
The following relational expression is obtained. From this equation, it can be seen that the distance between AB is preferably set longer than the value obtained by subtracting the paper width D from the maximum paper length L.

  FIG. 7 is a diagram illustrating an example in which the sheet conveyance direction in the sheet storage unit is set to be a predetermined angle upward with respect to the inclination angle of the sheet alignment tray. The upper surface 38b of the paper discharge guide plate 38 constituting the path of the first paper storage unit 4 is inclined at an angle θ with respect to the paper stacking surface of the alignment tray 32, and the alignment tray 32 and the paper in the first paper storage unit 4 Increase the distance between the top stacks. By doing so, even when the paper in the first paper storage unit 4 hangs down due to its own weight, it does not contact the paper bundle on the alignment tray 32 and does not affect the alignment of the paper bundle.

Therefore, when the angle formed by the paper conveyance direction of the conveyance roller 23 and the upper surface 38b of the discharge guide is θ ′,
θ> 0 °
θ '<45 °
The angle of the upper surface 38b of the discharge guide may be set within a range that satisfies the above condition.

  FIG. 8 is a view showing an example in which the sheet storage portion is bent in a substantially U shape when viewed from the conveyance direction. FIG. 8A is a view from the front, and FIG. 8B is the view in FIG. It is a C direction arrow directional view. As can be seen from FIG. 5B, when viewed from the paper transport direction (C direction), the upper surface 38b of the paper discharge guide plate 38 is curved in a U shape near the terminal end B. The curved shape may be convex upward or downward as shown in FIG. With such a shape, the paper is bent in a U shape in a direction perpendicular to the transport direction (paper width direction) and warped in the paper width direction. As a result, a so-called stiffness is applied to the paper, and it is possible to prevent the paper from hanging down due to its own weight.

  In addition, if not only the upper surface 38b of the discharge guide 39 but also the lower surface 25a of the proof tray 25 is curved in the same manner, it is possible to more reliably prevent the paper from drooping. However, if the paper is bent into a U-shape when transporting thick paper, the transport resistance becomes excessive, and there is a risk of insufficient torque of a motor (not shown) that drives the transport roller 23. Therefore, in this embodiment, the conveyance gap D is set wider.

  Such pre-stack control is executed by the control circuit of the sheet post-processing apparatus Fin. FIG. 9 is a block diagram illustrating a control configuration of an image forming system including the sheet post-processing apparatus Fin and the image forming apparatus PR. The sheet post-processing device Fin includes a control circuit mounted with a microcomputer having a CPU_Fin1, an I / O interface Fin2, and the like. The CPU_Fin1 includes a CPU of the image forming apparatus PR, switches of the operation panel PR1, and the like, and sensors (not shown). Is input through the communication interface PR2, and the CPU_Fin1 executes predetermined control based on the input signal. Further, the CPU_Fin1 drives and controls the solenoid and the motor via the driver and motor driver, and acquires sensor information in the apparatus from the interface. Further, the motor driver performs drive control by the motor driver via the I / O interface Fin2 according to the control target and the sensor, and sensor information is acquired from the sensor. The control is based on a program defined by the program code while the CPU_Fin1 reads a program code stored in a ROM (not shown), expands it in a RAM (not shown), and uses the RAM as a work area and a data buffer. Executed.

  Further, the control of the sheet post-processing apparatus Fin in FIG. 9 is executed based on an instruction or information from the CPU of the image forming apparatus PR. The user's operation instruction is issued from the operation panel PR1 of the image forming apparatus PR. As a result, the operation signal from the operation panel PR1 is transmitted from the image forming apparatus PR to the sheet post-processing apparatus Fin, and the processing state and function of the sheet post-processing apparatus Fin are notified to the user via the operation panel PR1. .

As described above, according to the present embodiment,
1) The staple processing path 3 and the first sheet storage unit 4 share the discharge guide plate 38, and the former of the discharge guide plate 38 is set on the lower surface side and the latter is set on the upper surface side. Is no longer necessary. As a result, the size of the device can be reduced and the cost can be reduced because a dedicated guide plate is not required.
2) Since the space 25b is provided in the lower surface 25a of the proof tray 25 so that the raised paper discharge guide plate 38 can be retracted into the space 25a, it is necessary to make a large opening / closing space for the paper discharge guide plate 38. Disappear. Thereby, size reduction can be attained regarding the height direction of an apparatus.
3) Since the leading end of the paper P21 of the next job protrudes from the first paper storage unit 4 to the outside, that is, the outside of the apparatus, and then transports in the reverse direction, the transport path length of the first paper storage unit 4 is It is possible to set the length shorter than the maximum conveyance length of the sheet, and it is possible to reduce the size in the width direction of the apparatus.
4) Since the upper angle of the paper discharge guide plate 38 when guiding the paper to the upper side of the paper discharge guide plate 38 is set to be larger than the inclination angle of the alignment tray 32, the first paper storage portion 4, even when the paper sheet 4 hangs downward due to its own weight, the paper bundle on the alignment tray 32 is not contacted, and the alignment of the paper bundle can be prevented from being disturbed.
5) Since the upper side of the paper discharge guide plate 38 is curved in a substantially U shape when viewed from the transport direction, the leading edge of the paper to be switched back in the first paper storage section 4 is viewed from the transport direction. Thus, the sheet is bent into a substantially U shape, and the paper can be prevented from hanging down due to its own weight. As a result, the sheet bundle in the staple processing path 3 is not brought into contact with the sheet processing path, and image contamination caused by rubbing sheets can be prevented.
There are effects such as.

  In this embodiment, the processing means in the claims is the jogger fence 33, the reference fence 35, the return roller 34 and the stapler 31, the stacking means is the alignment tray 32, the transport path is the shift processing path 2, and the transport means is The second transport roller 23, the retraction path to the second paper storage unit 5, one roller to the paper discharge driven roller 37, the transport guide plate to the reference numeral 38, the other roller to the paper discharge drive roller 36, The stacking means is on the paper discharge tray 61, the paper discharge means is on the paper discharge drive roller 36 and the paper discharge driven roller 37, the first switching means is on the first branching claw 22, and the upper surface of the paper discharge guide plate is on the reference numeral 38b. The second switching means is the second branch claw 41, the control means is CPU_Fin1, the proof tray is indicated by reference numeral 25, the lower surface of the proof tray is indicated by reference numeral 25a, the space is indicated by reference numeral 4a, and the fulcrum is indicated by reference numeral 4. a, in 38a, to save space code 25b, the image forming system to a sheet post-processing apparatus (sheet processing apparatus) Fin and the image forming apparatus PR, the corresponding.

  Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention, and all the technical matters included in the technical idea described in the claims are all included. The subject of the present invention. The above embodiment shows a preferable example, but those skilled in the art can realize various alternatives, modifications, variations, and improvements from the contents disclosed in this specification, These are included in the technical scope described in the appended claims.

2 shift processing path 4 second sheet storage unit 4a space 5 second sheet storage unit 22 first branching claw 23 second transport roller 25 proof tray 25a bottom surface of proof tray 25b retreat space 31 stapler 32 alignment tray 33 jogger Fence 34 Return roller 35 Reference fence 36 Paper discharge driving roller 37 Paper discharge driven roller 38 Transport guide plate 38a fulcrum 38b Top surface of paper discharge guide plate 41 Second branch claw 41a fulcrum 61 Paper discharge tray Fin Paper post-processing device (paper processing) apparatus)
Fin1 CPU
PR image forming device

JP 2009-292540 A

Claims (10)

A paper stacking means provided with a processing means for performing a preset process on the paper;
Transport means for transporting the paper that has been carried along the transport path to the stacking means;
A retreat path that branches on the upstream side of the transporting means of the transporting path, and reverses the transporting means to retract the paper before transporting the paper to the stacking means;
A paper processing apparatus comprising:
When retracting the sheet to the retract path, the transport unit guides the leading end side of the sheet to the outside of the apparatus, reverses the transport direction before the rear end of the sheet passes through the transport unit, and transports the sheet to the retract path. A paper processing apparatus. The sheet processing apparatus according to claim 1,
Discharge located on the downstream side of the conveyance path, with one roller supported on the conveyance guide plate so as to be openable and closable with respect to the other roller, and ejecting a bundle of sheets accumulated in the accumulation means to a subsequent stacking means Means,
A first switching unit that is provided at a branch portion of the transport path and the retreat path, switches the transport direction of the sheet that is transported by the transport unit in a direction opposite to the carry-in direction, and guides the sheet to the retreat path. When,
The sheet is provided on the downstream side of the conveying unit, and the sheet conveying direction is switched to the upper surface of the stacking unit or the discharge guide plate, and the sheet is loaded on the upper surface of the discharge guide plate before the sheet is retracted to the retract path. Second switching means for guiding;
A sheet processing apparatus comprising: The sheet processing apparatus according to claim 2,
A control means for controlling operations of the transport means, the paper discharge means, the first switching means and the second switching means;
The control means includes
When retracting the sheet to the retract path, the second switching means guides the leading edge of the next transported sheet to the upper surface of the discharge guide plate,
Before the trailing edge of the paper leaves the conveying means, the conveying means conveys the paper in a direction opposite to the carry-in direction, and guides the retraction path by the first switching means;
One or more sheets evacuated by the evacuation path at the same timing as the end of the processing by the processing means are superimposed on the next conveyed paper and conveyed in the loading direction by the conveying means to the accumulating means. A paper processing apparatus for discharging paper. The sheet processing apparatus according to claim 2 or 3,
The paper discharge guide plate is positioned below a proof tray of a paper processing apparatus, and the paper is guided to a space between an upper surface of the paper discharge guide plate and a lower surface of the proof tray. Processing equipment. The sheet processing apparatus according to any one of claims 2 to 4,
The second switching means has a fulcrum on the upstream side in the paper conveyance direction, and the discharge guide plate is supported on the fulcrum around the fulcrum, and both operate independently. A paper processing apparatus. The sheet processing apparatus according to claim 4,
The paper discharge guide plate has a fulcrum on the downstream side in the paper conveyance direction, and is supported to be swingable about the fulcrum.
The sheet processing apparatus according to claim 1, further comprising: a retreat space on a lower surface side of the proof tray, in which the discharge guide plate can be retracted when the discharge guide plate is raised. The sheet processing apparatus according to any one of claims 2 to 6,
A distance between an end of the paper discharge guide plate on the most downstream side in the paper conveyance direction and a portion of the conveyance unit that holds the paper is set to be shorter than the maximum conveyance length of the paper. Paper processing device. A sheet processing apparatus according to any one of claims 2 to 7,
The paper processing apparatus, wherein an angle of an upper surface of the paper discharge guide plate when guiding the paper to the upper surface of the paper discharge guide plate is set to be larger than an inclination angle of the stacking unit. The sheet processing apparatus according to any one of claims 2 to 8,
The sheet processing apparatus according to claim 1, wherein an upper surface of the sheet discharge guide plate is curved in a substantially U shape when viewed from the conveyance direction. An image forming system comprising the sheet processing apparatus according to claim 1.

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