JP2014015312A - Post-processing device, and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably stack a paper bundle subjected to binding processing.SOLUTION: There is provided a post-processing device which comprises: a stapleless binding mechanism which forms a slit on paper bundles B1 and B2 and a tongue portion in which one end part leaves a part continuing to the paper bundles B1 and B2 and binds the tongue portion by inserting the other end part of a folded tongue portion into the slit; a stacking part 70 for stacking the bound paper bundles B1 and B2; and a tamper which moves the paper bundles B1 and B2 in a direction crossing a conveyance direction of the paper bundles B1 and B2 so that the paper bundles B1 and B2 stacked on the stacking part 70 are not overlapped with each other. Further, the stapleless binding mechanism has a drive mechanism for changing a binding angle which is an angle where the stapleless binding mechanism applies binding processing to the paper bundles B1 and B2, and the tamper changes distances H1, H2, and H3 for moving the paper bundles B1 and B2 in a direction crossing a conveyance direction of the paper bundles B1 and B2 according to an aspect of the tongue portion which changes depending on the binding angle.

Description

  The present invention relates to a post-processing apparatus and an image forming system.

  For example, in Patent Document 1, in order to improve convenience when sealing and opening documents, a cutting blade, a knife, and a cam are attached to an upper mold that can move the sealing device up and down, and a predetermined hole is opposed to these. And a lower mold for receiving a document to be sealed. This lower die is punched so that the cutting blade does not leave a part of the document away from the document when the upper die approaches, and at the same time, the knife makes a groove in the document adjacent to the punched part, and then the cam strikes. The punched portion is folded, and when the upper die is separated from the lower die, the knife inserts the tip of the punched portion into the groove to seal the document. In addition, it is disclosed that an upper blade is attached to an upper die, a lower blade is attached to a lower die, and a document is cut when the upper die approaches the lower die.

  Further, in Patent Document 2, a tongue-like piece is formed by lowering the lever by operating the lever so as to be able to bind the documents without using a metal needle, and by cutting the three ends of the paper bundle. There is disclosed a document binding tool including a first punch and a second punch that forms a reverse tongue-like piece that is also surrounded by three cuts in the vicinity thereof. In addition, the document binding tool is provided with a rotating claw that rotates in conjunction with the lowering of the first punch to bend the downward tongue-shaped piece formed by the first punch to the side, and the rotating claw is on the side. The tongue-shaped piece bent upward is lifted in a state where the tip of the tongue-shaped piece is supported from below, and the tongue-shaped piece is pushed into the punched hole formed by pushing up the tongue-shaped piece formed by the second punch. It is disclosed that a hooking portion to be inserted and locked is provided in the second punch.

  Patent Document 3 discloses an image forming apparatus main body including a document reading unit, a main body tray, an image forming unit, and a paper feeding unit in order to provide a paper discharge device that improves the stacking performance of discharged paper bundles. And a paper stacking unit including a paper post-processing device and a shifter mechanism, and an image forming apparatus in which the paper stacking unit functions as a paper discharge device is disclosed. Here, the sheet bundle stapled by the sheet post-processing device is alternately offset by a shifter mechanism at a discharge position left and right, that is, at a predetermined distance in the horizontal direction orthogonal to the discharge direction, and discharged to the second sheet stack tray. Is disclosed.

Japanese Patent Publication No.49-5960 Japanese Patent No. 2903492 JP 2006-8370 A

  An object of the present invention is to stably stack a bundle of sheets subjected to a binding process.

  According to the first aspect of the present invention, a tongue is formed in which a notch is formed in a part of the sheet bundle, and a part of one end of the sheet bundle is continuous with the sheet bundle by cutting into a predetermined shape. A binding means for binding the paper bundle by folding the tongue and inserting the other end of the tongue into the notch, and stacking the paper bundle bound by the binding means A stacking unit that moves the sheet bundle in a direction that intersects a conveyance direction of the sheet bundle so that the tongues of the sheet bundle stacked on the stacking unit do not overlap each other, The binding unit includes a binding angle changing mechanism that changes a binding angle, which is an angle at which the binding unit performs a binding process on the sheet bundle, and the moving unit changes the binding angle according to the binding angle. In Flip with a post-processing apparatus characterized by changing the distance of moving the sheet bundle in a direction intersecting the transport direction of the sheet bundle.

The invention according to claim 2 is characterized in that the moving means changes the distance to move the sheet bundle according to the form of the tongue and the form of the sheet bundle. Device.
According to a third aspect of the present invention, in the post-processing apparatus according to the second aspect, the moving means changes a distance by which the sheet bundle is moved according to the number of sheets constituting the sheet bundle. is there.
The invention according to claim 4 is characterized in that the moving means sets the distance to move the sheet bundle to 0 when the number of sheets constituting the sheet bundle is smaller than a predetermined number. The post-processing device according to Item 3.

The invention according to claim 5 is characterized in that the moving means changes the distance to move the sheet bundle in accordance with the length of the sheet bundle in a direction intersecting the transport direction of the sheet bundle. The post-processing apparatus according to Item 2.
According to a sixth aspect of the present invention, when the length of the sheet bundle in a direction intersecting the conveyance direction of the sheet bundle is shorter than a predetermined length, the moving unit sets a distance to move the sheet bundle. The post-processing apparatus according to claim 5, wherein the post-processing apparatus is set to zero.

  According to a seventh aspect of the present invention, there is provided an image forming unit for forming an image on a sheet, a sheet bundle forming unit for stacking a plurality of sheets on which images are formed by the image forming unit to form a sheet bundle, and the sheet bundle. Tongue that forms a cut in a part of the sheet bundle formed by the forming means and cuts a part of the sheet bundle into a predetermined shape to leave a portion where one end is continuous with the sheet bundle. Is formed on the sheet bundle, the tongue is folded, the other end of the tongue is inserted into the notch, the binding unit binding the sheet bundle, and the sheet bundle bound by the binding unit is stacked. Stacking means; and moving means for moving the sheet bundle in a direction intersecting with the conveyance direction of the sheet bundle so that the tongue portions of the sheet bundle stacked on the stacking means do not overlap each other. Means The binding means includes a binding angle changing mechanism that changes a binding angle that is an angle at which a binding process is performed on the sheet bundle, and the moving means has a tongue portion that changes according to the binding angle. The image forming system is characterized in that a distance to which the sheet bundle is moved is changed in a direction crossing a conveyance direction of the sheet bundle.

According to the first aspect of the present invention, the sheet bundle subjected to the binding process can be stably stacked as compared with the case where the present configuration is not provided.
According to the second aspect of the present invention, compared with the case where the present configuration is not provided, it is possible to suppress the distance for moving the sheet bundle according to the form of the sheet bundle.
According to the third aspect of the present invention, compared to the case where the present configuration is not provided, it is possible to suppress the distance to move the sheet bundle according to the number of sheets constituting the sheet bundle.
According to the fourth aspect of the present invention, it is possible to suppress the tongue formed on the sheet bundle from being damaged as the sheet bundle is moved, as compared with the case where the present configuration is not provided.

According to the fifth aspect of the present invention, compared to the case where the present configuration is not provided, the distance to which the sheet bundle is moved in accordance with the length of the sheet bundle in the direction intersecting the sheet bundle conveyance direction can be suppressed. it can.
According to the sixth aspect of the present invention, it is possible to suppress the tongue formed on the sheet bundle from being damaged as the sheet bundle is moved, as compared with the case where the present configuration is not provided.
According to the seventh aspect of the present invention, the sheet bundle subjected to the binding process can be stably stacked as compared with the case where the present configuration is not provided.

1 is a schematic configuration diagram showing an image forming system to which an embodiment of the present invention is applied. It is a schematic block diagram which shows the periphery of the compilation | stacking part. It is a schematic block diagram which shows the periphery of the compilation | stacking part seen from the III direction of FIG. It is a schematic block diagram which shows a stapleless binding mechanism and its peripheral member. It is explanatory drawing which shows the part bound by the stapleless binding mechanism. It is explanatory drawing which shows the change of the angle of the part bound by the stapleless binding mechanism. It is explanatory drawing which showed the hardware constitutions of the control part. FIG. 6 is an explanatory diagram illustrating an arrangement of a sheet bundle on a stacking unit. It is the figure which showed an example of the offset table stored in a memory | storage part. It is explanatory drawing which shows the relationship between the thickness of a sheet bundle, and a tongue part. It is the figure which showed the other example of the offset table stored in a memory | storage part. It is explanatory drawing which showed the modification which forms two binding parts in a paper bundle. It is explanatory drawing which shows the relationship between a binding part and offset amount. It is explanatory drawing which shows the other example of a binding part.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Image forming system 1>
FIG. 1 is a schematic configuration diagram illustrating an image forming system 1 to which the exemplary embodiment is applied. An image forming system 1 shown in FIG. 1 performs post-processing on, for example, an image forming apparatus 2 such as a printer or a copier that forms an image by electrophotography, and a sheet S on which a toner image is formed by the image forming apparatus 2. And a sheet processing apparatus 3 to be applied.

<Image forming apparatus 2>
The image forming apparatus 2 includes a sheet supply unit 5 that supplies a sheet S on which an image is formed, and an image forming unit (image forming unit) 6 that forms an image on the sheet S supplied from the sheet supply unit 5. Further, the image forming apparatus 2 includes a sheet reversing device 7 that reverses the surface of the sheet S on which an image is formed by the image forming unit 6 and a discharge roll 9 that discharges the sheet S on which the image is formed. Furthermore, the image forming apparatus 2 includes a user interface 90 that receives information related to the binding process from the user.

<Paper Processing Device 3>
The paper processing device 3 includes a transport device 10 that transports the paper S output from the image forming device 2 further downstream, a compile stacking unit (paper bundle forming mechanism) 35 that collects and bundles the paper S, and the paper S. And a post-processing device 30 including a needleless binding mechanism 150 that binds the end portions. In the illustrated example, the sheet processing apparatus 3 includes a control unit 80 that controls the entire image forming system 1.
The conveyance device 10 of the paper processing device 3 is configured to apply an entrance roll 11 that is a pair of rolls that receive the paper S output via the discharge roll 9 of the image forming device 2 and the paper S received by the entrance roll 11. And a puncher 12 for drilling as necessary. Further, the transport device 10 further downstream of the puncher 12 includes a first transport roll 13 that is a pair of rolls for transporting the paper S to the downstream side, and a pair of transports the paper S toward the post-processing device 30. And a second transport roll 14 which is a roll.

  The post-processing device 30 of the paper processing device 3 includes a receiving roll 31 that is a pair of rolls that receive the paper S from the transport device 10. The post-processing device 30 includes a compile stacking unit 35 that is provided on the downstream side of the receiving roll 31 and collects and stores a plurality of sheets S, and a pair of rolls that discharge the sheet S toward the compile stacking unit 35. An exit roll 34 is provided.

  Further, the post-processing device 30 includes a paddle 37 that rotates to push the paper S toward an end guide 35b (described later) of the compilation stacking unit 35, a tamper 38 for aligning the ends of the paper S, and a compilation stacking unit. An eject roll (sheet bundle conveying unit) 39 for conveying the bundled sheet bundle B by pressing and rotating the sheets S collected at 35 is provided. Furthermore, the post-processing device 30 includes a stapleless binding mechanism 150 that binds the end portion of the sheet bundle B accumulated in the compilation stacking unit 35. Further, the post-processing device 30 includes a rail 44 that is provided along an end guide 35 b (described later) of the compiling stacking unit 35 and on which the stapleless binding mechanism 150 is mounted.

In addition, the post-processing device 30 includes a housing 30A that accommodates the above-described components. The housing 30 </ b> A includes an opening 69 for discharging the sheet bundle B to the outside of the post-processing device 30 by the eject roll 39.
Further, the post-processing device 30 includes a stacking unit (stacking unit) 70 that stacks the sheet bundle B discharged from the opening 69 of the housing 30A so that the user can easily take it.

<Structure around the compiling loader 35>
Next, the compile stacking unit 35 and the surrounding structure will be described with reference to FIGS. Here, FIG. 2 is a schematic configuration diagram showing the periphery of the compile stacking unit 35, and FIG. 3 is a schematic configuration diagram of the periphery of the compile stacking unit 35 viewed from the direction of arrow III in FIG.
In FIG. 3, some constituent members such as the paddle 37 and the eject roll 39 are omitted. Also, the lower side in FIG. 3 shows the user side of the image forming system 1, and shows the front side of the paper in FIGS.

First, the compiling stacking unit (sheet bundle forming mechanism) 35 includes a bottom 35a having an upper surface on which the sheets S are stacked. The bottom portion 35a is provided so as to be inclined so that the paper S falls along the upper surface.
In addition, the compiling stacking unit 35 includes an end guide 35b that is arranged so as to align the end of the sheet S falling along the bottom 35a in the traveling direction.

  As will be described in detail later, the movement of the sheet S around the compile stacking unit 35 is first supplied toward the compile stacking unit 35 (see the first traveling direction S1 in FIG. 2), and then the traveling direction is changed. It reverses and falls along the bottom 35a of the compiling stacking section 35 (see the second traveling direction S2 in FIG. 2). Thereafter, the ends of the sheets S are aligned, and a sheet bundle B is formed. Then, the sheet bundle B rises along the bottom 35a of the compiling stacking portion 35 with the traveling direction reversed (see the third traveling direction S3 in FIG. 2).

  Here, as shown in FIG. 3, in the present embodiment, each end of the bottom portion 35a of the compiling stacking portion 35 is defined as follows. First, the end portion on the leading end side in the second traveling direction S2 indicating the direction in which the sheet S falls along the upper surface of the bottom portion 35a of the compiling stacking portion 35 is referred to as a leading end portion Ta. This tip side end portion Ta is an end portion in contact with the end guide 35b. Further, an end portion along the second traveling direction S2 and the end portion on the user side (lower side in FIG. 3) of the image forming system 1 is referred to as a side end portion Tb.

  Next, the paddle 37 is provided above the compilation stacking unit 35 and downstream of the exit roll 34 in the first traveling direction S1 of the sheet S. Further, the paddle 37 is provided so that the distance from the bottom 35a of the compiling stacking portion 35 is changed by being driven by a motor or the like (not shown). Specifically, the paddle 37 is provided so as to be movable in the directions of arrows U1 and U2 in FIG. 2, and moves in the direction of the arrow U1 to approach the bottom 35a of the compile stacking unit 35 (drawn by a solid line). The position Pb) is moved away from the bottom 35a of the compiling stacking unit 35 by moving in the direction of the arrow U2 (position Pa drawn by a broken line). Then, the paddle 37 rotates in the direction of the arrow R1 in FIG. 2 so that the sheet S conveyed along the first traveling direction S1 in FIG. It is configured to push in the direction S2.

  As shown in FIG. 3, the tamper 38 has a first tamper 38 a and a second tamper 38 b that are opposed to each other with the compilation stacking unit 35 interposed therebetween. Specifically, the first tamper 38a and the second tamper 38b are arranged to face each other in a direction (vertical direction in FIG. 3) intersecting the second traveling direction S2. The first tamper 38a and the second tamper 38b are provided such that the distance between the first tamper 38a and the second tamper 38b is changed by being driven by a motor or the like (not shown).

Here, the tamper 38 is configured to align the end portions along the traveling direction of the sheet S falling along the bottom portion 35a. Specifically, the first tamper 38a is located between a position approaching the compiling stacking unit 35 (a position Pax drawn with a solid line) and a position moving away from the compiling stacking unit 35 (a position Pay drawn with a broken line). They are arranged to move between them (arrows C1 and C2). On the other hand, the second tamper 38b moves between a position approaching the compiling stacking portion 35 (position Pbx drawn with a solid line) and a position moving away from the compiling stacking portion 35 (position Pby drawn with a broken line). (Arrows C3 and C4).
The positions Pax, Pay, Pbx, and Pby of the first tamper 38a and the second tamper 38b in the present embodiment are the paper size and orientation of the paper S supplied to the compiling stacking unit 35, and an offset amount described later. Each position can be changed according to the above. The tamper 38 and the control unit 80 can be regarded as moving means.

The eject roll 39 includes a first eject roll 39a and a second eject roll 39b, and the first eject roll 39a and the second eject roll 39b sandwich the bottom 35a of the compiling stacking section 35, and the upper side of the bottom 35a. It is arranged to face the lower side.
The first eject roll 39a is provided on the bottom side 35a of the compiling stacking unit 35 on the surface side on which the sheets S are stacked. Further, the first eject roll 39a is provided so as to be capable of advancing and retreating with respect to the second eject roll 39b upon being driven by a motor or the like (not shown). That is, the distance between the first eject roll 39a and the sheet S stacked on the bottom 35a of the compiling stacking unit 35 is changed. On the other hand, the second eject roll 39b is disposed at the bottom 35a of the compiling stacking unit 35, and is disposed on the back side of the surface on which the sheets S are stacked. ing.

Specifically, the first eject roll 39a moves in the direction of the arrow Q1, and the first eject roll 39a approaches the bottom 35a of the compilation stacking section 35 (position P2 drawn with a broken line). On the other hand, the first eject roll 39a moves in the direction of the arrow Q2, and the first eject roll 39a moves away from the bottom 35a of the compiling stacking section 35 (position P1 drawn by a solid line).
The first eject roll 39a is driven by a motor or the like (not shown) in contact with the paper S, and rotates in the T1 direction to raise the paper bundle B (in the third traveling direction S3) and convey it. Is configured to do.
The positions P1 and P2 of the first eject roll 39a can be changed according to the number and thickness of the sheets S supplied to the compiling stacking unit 35.

  As described above, the stapleless binding mechanism 150 is mounted on the rail 44. More specifically, the rail 44 is provided such that the mounted stapleless binding mechanism 150 is movable along the end guide 35b (in the direction of arrow A in FIG. 3).

<Needleless binding mechanism 150>
Next, the structure of the stapleless binding mechanism 150 will be described with reference to FIG. Here, FIG. 4 is a schematic configuration diagram showing the needleless binding mechanism 150 and its peripheral members.
The stapleless binding mechanism (binding means) 150 is configured to bind the end portion of the sheet bundle B by deforming the sheet S constituting the sheet bundle B without using a stapler spelling needle (so-called staple needle). Yes.

As illustrated in FIG. 4, the stapleless binding mechanism 150 includes a base 501 and a base 503 that are arranged to face each other. The needleless binding mechanism 150 is controlled by the control unit 80 to drive the needleless binding mechanism 150, a cam 82 that is driven by the needleless binding motor M <b> 1 to rotate, and the cam 82. And a spring 84 that applies a force opposite to the transmitted driving force. Furthermore, the needleless binding mechanism 150 includes a drive mechanism (angle changing mechanism) 151 including a gear and the like that are driven by the needleless binding motor M1 and rotate.
Although details will be described later, in the stapleless binding mechanism 150, the base 503 driven by the stapleless binding motor M1 approaches the base 501 in a state where the sheet bundle B is sandwiched between the bases 501 (in the drawing). In the direction of arrow F1, the sheet bundle B is bound.

Next, the base 501 will be described in detail.
As shown in FIG. 4, the base 501 is provided with a holding member 502 disposed so as to be substantially parallel to the base 501. The base 501 and the restraining member 502 are provided with the bottom 35a (see FIG. 2) of the compiling stacking unit 35 interposed therebetween, and the sheet bundle B stacked on the compiling stacking unit 35 is restrained as the base 501. It is sandwiched and held by the member 502. As shown in FIG. 4, the base 501 has a protrusion 506 that extends toward the base 503 and is formed integrally with the base 501.

Next, the base 503 will be described in detail.
As shown in FIG. 4, the base 503 has a blade 504 for cutting the sheet bundle B, a tongue 522 (described later) formed on the sheet bundle B, bent, and a slit 521 (described later) formed by the blade 504. And a punching member 505 into which the tongue 522 is inserted.

  Here, the blade 504 is formed of a substantially rectangular plate-like member that extends toward the sheet bundle B sandwiched between the base 501 and the holding member 502. Specifically, the blade 504 has eye holes 504a on a substantially rectangular surface, and further has a tip 504b whose width decreases as the sheet bundle B is approached.

  The punching member 505 is an L-shaped member having a bent portion. One end of the punching member 505 is a main portion 505a, and the other end is a sub-portion 505b. The punching member 505 has a main portion rotation shaft 505r provided at the bent portion. This punching member 505 is rotatable around a main portion rotation shaft 505r. More specifically, the main portion 505a can be inclined to the blade 504 side. Note that there is a gap between the sub-portion 505b and the base portion 503 so that the punching member 505 can rotate.

  Here, the main portion 505 a extends toward the base 501. Further, the main portion 505a has a blade portion 505c on the side opposite to the side where the main portion rotating shaft 505r is provided, that is, on the side facing the base 501. The blade portion 505c is a blade that punches out the shape of the tongue portion 522. Note that no blade is formed on the side of the blade portion 505c that faces the blade 504, and the tongue portion 522 and the sheet S are configured to be continuous by an end portion 522a described later. Further, the main portion 505 a has a protrusion 505 d extending toward the blade 504 on the side of the main portion 505 a, specifically, on the side facing the blade 504.

Next, the drive mechanism 151 will be described.
As described above, the drive mechanism 151 is configured by, for example, a gear that is driven by the needleless binding motor M1 and rotates. When the drive mechanism 151 is driven, the stapleless binding mechanism 150 moves on the rail 44 (see arrow A in FIG. 3), and the position where the binding process is performed on the sheet bundle B is changed. Further, when the driving mechanism 151 is driven, the base 503 is rotated (see an arrow D in FIG. 3), and the angle at which the binding process is performed on the sheet bundle B is changed.

<Operation of Needleless Binding Mechanism 150>
Here, the operation of the stapleless binding mechanism 150 to bind the end portion of the sheet bundle B stacked on the compiling stacking unit 35 will be specifically described with reference to FIGS.
Here, FIG. 5 is an explanatory view showing a portion bound by the stapleless binding mechanism 150. More specifically, FIG. 5A is an explanatory diagram showing the positional relationship between the slit 521 and the tongue 522, and FIG. 5B shows the slit 521 and the tongue 522 when being bound by the needleless binding mechanism 150. FIG. 5C is an explanatory view showing the front side of the binding portion 51, and FIG. 5D is an explanatory view showing the back side of the binding portion 51.

  First, when the sheet bundle B to be subjected to the binding process is stacked on the compilation stacking unit 35, the stapleless binding motor M1 is driven in response to a signal from the control unit 80, and the drive mechanism 151 performs the binding process on the sheet bundle B. The stapleless binding mechanism 150 is moved to the application position. Further, the drive mechanism 151 rotates the base 503 at an angle at which the sheet bundle B is bound.

  Then, the cam 82 rotates in response to the drive of the stapleless binding motor M1. As a result, the base portion 503 approaches the base 501 (in the direction of arrow F1), and the tip portion 504b of the blade 504 and the blade portion 505c of the punching member 505 penetrate the sheet bundle B. Then, a slit (cut) 521 and a tongue 522 from which the sheet S is punched out while leaving one end 522a are formed on the sheet S constituting the sheet bundle B (see FIG. 5A).

  As shown in FIG. 4, when the cam 82 rotates and further presses down the base portion 503, the sub-portion 505 b of the punching member 505 hits the protruding portion 506 formed integrally with the base 501, and the punching member 505 is moved. 4 rotates about the main portion rotation shaft 505r in the clockwise direction in FIG. As a result, the main portion 505 a is inclined toward the blade 504, and the protrusion 505 d of the punching member 505 approaches the blade 504. As shown in FIG. 5B, the protrusion 505d of the punching member 505 bends the tongue 522 and pushes the other end 522b of the tongue 522 toward the eye hole 504a of the blade 504 (arrow F2 in the figure). direction). In FIG. 5B, the punching member 505 is not shown.

  Then, as shown in FIG. 4, after the cam 82 further rotates and passes through the bottom dead center, the base 503 moves away from the base 501 while receiving the force of the spring 84 (see arrow F3). When the base 503 moves in the direction of the arrow F3 in the figure, the tongue 522 moves in a state of being caught in the eye hole 504a of the blade 504. Then, as shown in FIGS. 5C and 5D, the sheet bundle B is bound by inserting (weaving) the tongue 522 into the slit 521. At this time, a binding hole 523 is formed in the sheet bundle B where the tongue 522 is punched. In the following description, a part of the sheet bundle B in which the slit 521, the tongue 522, and the binding hole 523 are arranged, and a portion subjected to the binding process in the sheet bundle B is referred to as a binding part 51.

<Binding portion 51>
Here, the binding portion 51 will be described with reference to FIGS. 5 and 6.
FIG. 6 is an explanatory view showing a change in the angle of the portion bound by the stapleless binding mechanism 150.
First, as shown in FIGS. 5C and 5D, the tongue portion 522 of the binding portion 51 protrudes from the front and back surfaces of the sheet bundle B. That is, the binding portion 51 is thicker than the other portions in the sheet bundle B, and forms bulges on the front and back sides of the sheet bundle B.

Further, the front end (the other end 522 b) of the tongue 522 in the binding portion 51 is disposed outside the sheet S from the root (the one end 522 a) of the tongue 522.
Here, for example, when the sheet bundle B is opened by the user, the sheet bundle B is gradually rolled in a state where a part of the sheet S constituting the sheet bundle B is picked. At this time, normally, the portion where the sheet S is picked is located at the end of the sheet bundle B other than the corner portion where the binding portion 51 of the sheet bundle B is formed. Therefore, the binding portion 51 is gradually opened from the center side of the sheet S as the sheet S is picked from the picked portion. At this time, if the tip of the tongue 522 (the other end 522 b) is arranged facing the outside of the paper S as shown in the drawing, the tongue 522 receives a force in the direction of entering the slit 521. Accordingly, it is possible to prevent the binding portion 51 from being unbound.

  As described above, in this embodiment, the driving mechanism 151 rotates the base portion 503 to change the angle at which the sheet bundle B is subjected to the binding process. As a result, as shown in FIG. 6, the angle of the binding portion 51 formed in the sheet bundle B in the sheet bundle B is changed. That is, the binding angle α, which is the angle formed by the direction along the tongue 522 of the binding portion 51 and the direction in which the sheet bundle B is conveyed (third traveling direction S3), changes.

  In other words, as shown in FIG. 6, the length (binding length) of the binding portion 51 in the direction A intersecting (orthogonal) with the direction in which the sheet bundle B is conveyed (third traveling direction S3) is the binding angle. It changes according to α. Specifically, the binding length L1 when the binding angle α shown in FIG. 6A is 90 degrees, the binding length L2 when the binding angle α shown in FIG. 6B is 45 degrees, FIG. As shown in c), the binding length L3 when the binding angle α is 0 degrees is shorter in this order.

<Control unit 80>
Next, the control unit 80 that controls the entire image forming system 1 (see FIG. 1) will be described with reference to FIG. FIG. 7 is an explanatory diagram showing the hardware configuration of the control unit 80.
As illustrated in FIG. 7, the control unit 80 includes a processing unit 801 that executes a processing program, and a storage unit 802 that stores various programs, various tables, parameters, and the like. The processing unit 801 is, for example, a CPU (Central Processing Unit), and the storage unit 802 is, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), and an HDD (Hard Disk Drive).

<Operation of Image Forming System 1>
Next, the operation of the image forming system 1 will be described with reference to FIGS.
First, in the present embodiment, information relating to an image formed on the sheet S and binding processing is received via a personal computer (not shown), the user interface 90, or the like. The control unit 80 receives these pieces of information and generates image forming operation information (so-called job information). Then, the operation of the image forming system 1 is started by an instruction from the control unit 80.
In the state before the toner image is formed on the first sheet S by the image forming unit 6 of the image forming apparatus 2, the respective members are arranged as follows. That is, the first eject roll 39a is disposed at the position P1, the paddle 37 is disposed at the position Pa, the first tamper 38a is disposed at the position Pay, and the second tamper 38b is disposed at the position Pbx. Further, as shown in FIG. 3, the needleless binding mechanism 150 is disposed on the side end portion Tb side of the rail 44.

Then, a toner image is formed on the first sheet S by the image forming unit 6 of the image forming apparatus 2. As shown in FIG. 1, the first sheet S on which the toner image is formed is reversed by the sheet reversing device 7 as necessary, and then is fed to the sheet processing device 3 one by one through the discharge roll 9. Supplied.
In the transport device 10 of the paper processing device 3 to which the first paper S is supplied, the first paper S is received by the entrance roll 11, and punching processing is performed on the first paper S by the puncher 12 as necessary. Is given. Thereafter, the first sheet S is conveyed toward the downstream post-processing device 30 via the first conveyance roll 13 and the second conveyance roll 14.

  In the post-processing device 30, the first sheet S is received by the receiving roll 31. The first sheet S that has passed through the receiving roll 31 is conveyed by the exit roll 34 in the first traveling direction S1. At this time, the first sheet S passes between the compiling stacking unit 35 and the first eject roll 39a, and further passes between the compiling stacking unit 35 and the paddle 37.

  After the leading edge of the first sheet S in the first advancing direction S1 passes between the compiling stacking unit 35 and the paddle 37, the paddle 37 descends from the position Pa (moves in the direction of arrow U1 in FIG. 2). It arrange | positions in the position Pb. As a result, the paddle 37 comes into contact with the first sheet S. The first sheet S is pushed in the second traveling direction S2 of FIG. 2 by the rotation of the paddle 37 shown in FIG. 2 in the direction of arrow R1, and the end of the first sheet S on the end guide 35b side is pushed. The portion comes into contact with the end guide 35b. Thereafter, the paddle 37 rises (moves in the direction of the arrow U2 in FIG. 2), moves away from the first sheet S, and is placed again at the position Pa.

  Furthermore, after the first sheet S is received by the compiling stacking unit 35 and the end on the end guide 35b side reaches the end guide 35b, the first tamper 38a moves in the direction of the arrow C2 in FIG. The first sheet S is brought into contact with the second tamper 38b disposed at the position Pbx. Thereafter, the first tamper 38a is separated from the first sheet S (moved in the direction of the arrow C1 in FIG. 3) and is disposed again at the position Pay.

  When the second and subsequent sheets S on which the toner image is formed by the image forming unit 6 following the first sheet S are supplied to the post-processing device 30 in order, the paddle 37 is the same as the above-described operation. And the end of the paper S is aligned by the tamper 38. That is, the second sheet S is supplied in a state where the first sheet S is aligned, and the second sheet S is aligned with the first sheet S. The same applies to the case where the sheet S is supplied after the third sheet. In this way, a predetermined number of sheets S are accommodated in the compilation stacking unit 35, and the end of each sheet S is aligned to form a sheet bundle B.

Then, the first eject roll 39a descends from the position P1 (moves in the direction of the arrow Q1 in FIG. 2) and is disposed at the position P2. As a result, the aligned sheet bundle B is sandwiched and fixed between the first eject roll 39a and the second eject roll 39b.
Next, upon receiving the driving force from the drive mechanism 151, the stapleless binding mechanism 150 moves to a portion where the binding process is performed (see arrow A), and the base 503 is rotated to an angle at which the stapleless binding mechanism 150 performs the binding process. (See arrow D).
Then, the stapleless binding mechanism 150 performs a binding process on the sheet bundle B stacked on the compilation stacking unit 35.

Next, the sheet bundle B bound by the stapleless binding mechanism 150 is subjected to an offset process as necessary (described later).
Then, as the first eject roll 39a rotates (arrow R2 in FIG. 2), the sheet bundle B rises along the bottom 35a of the compiling stack 35 (see the third traveling direction S3 in FIG. 2). ) And discharged from the compiling stacking unit 35. Then, the sheet bundle B is discharged to the stacking unit 70 through the opening 69.

<Offset>
Now, with reference to FIGS. 8 and 9, an operation for offsetting the sheet bundle B bound by the stapleless binding mechanism 150 will be described. FIG. 8 is an explanatory diagram showing the arrangement of the sheet bundle B on the stacking unit 70. FIG. 9 is a diagram showing an example of an offset table stored in the storage unit 802 (see FIG. 4).

  First, in the present embodiment, the binding portion 51 formed in the sheet bundle B includes a thick portion in the sheet bundle B as described above. Therefore, when the binding portion 51 is stacked on the stacking portion 70 so as to overlap, the stacked sheet bundle B becomes unstable due to the accumulation of the swelling of the binding portion 51. More specifically, since the tongue portions 522 of the binding portion 51 overlap each other, the sheet bundle B becomes unstable, and is not suitable for stacking a particularly large amount of sheet bundles.

  Therefore, as shown in FIG. 8, in the present embodiment, the sheet bundle B bound by the stapleless binding mechanism 150 is offset. Here, the offset means that the sheet bundle B is arranged on the stacking unit 70 while shifting the position in the direction intersecting the conveyance direction of the sheet bundle B (see the third traveling direction S3).

  In the illustrated example, the binding portion 51 formed on the sheet bundle B does not contact the upper and lower sheet bundles B by offsetting the sheet bundle B. More specifically, in the sheet bundle B1 and the sheet bundle B2 that are continuously conveyed, the position where the sheet bundle B2 stacked on the sheet bundle B1 does not contact the binding portion 51 formed on the sheet bundle B1. Placed in. Therefore, it is possible to prevent the binding portions 51 from overlapping and the sheet bundle B from becoming unstable. Further, since the binding portions 51 having a large thickness overlap with each other, an increase in the height of the stacked sheet bundle B is suppressed.

Here, the larger the amount (distance) for offsetting the sheet bundle B, the smaller the area where the sheet bundles B stacked on the stacking unit 70 overlap. Therefore, the sheet bundle B stacked on the stacking unit 70 becomes more unstable.
Therefore, in the present embodiment, the offset amount is changed according to the form of the binding portion 51 to be formed. As a result, the binding amount 51 of the sheet bundle B stacked on the stacking unit 70 is prevented from overlapping while suppressing the offset amount from becoming too large.

Specifically, the binding angle α (see FIG. 6A), which is the angle formed by the direction along the tongue 522 of the binding portion 51 and the direction in which the sheet bundle B is conveyed (third traveling direction S3). ) To vary the offset amount.
More specifically, the offset amount H1 when the binding angle α shown in FIG. 8A is 90 degrees, the offset amount H2 when the binding angle α shown in FIG. 8B is 45 degrees, FIG. 8C. The offset amount H3 when the binding angle α shown in FIG. In other words, the offset amount is decreased as the binding angle α decreases.

Then, for example, a table defining the relationship between the binding angle α and the offset amount as shown in FIG. 9 is stored in the storage unit 802 (see FIG. 7) of the control unit 80.
As shown in FIG. 9, the offset table has “binding angle” and “offset” as items. The “binding angle” indicates the binding angle α. In the illustrated example, there are “90 degrees”, “45 degrees”, and “0 degrees”. “Offset” indicates an offset amount. In the illustrated example, the offset amount H1 (see FIG. 8A) is “H1”, the offset amount H2 (see FIG. 8B) is “H2”, and the offset amount H3 (see FIG. 8C). “H3”. For example, “H1” means 20 mm, “H2” means 15 mm, and “H3” means 10 mm.

  Here, as an example of the mode of the binding portion 51, the offset amount is formed according to the binding angle α. However, it is sufficient that the offset amount is changed according to the mode of the binding portion 51 that changes depending on the binding angle α. For example, as described in FIG. 6, the offset amount is set according to the binding length of the binding portion 51. The configuration may be changed.

<Offset operation>
Next, the operation for performing the offset process will be described with reference to FIG. 3, FIG. 7, FIG. 8, and FIG.
First, information related to the binding process is received via the user interface 90 or the like. Upon receiving the information related to the binding process, the control unit 80 determines the offset amount by the processing unit 801 of the control unit 80 referring to a table illustrated in FIG. 9 stored in the storage unit 802.

  Then, in response to an instruction from the processing unit 801, the stapleless binding mechanism 150 performs a binding process on the sheet bundle B formed in the compilation stacking unit 35, and then the first eject roll 39a moves up from the position P2. (The direction of arrow Q2 in FIG. 2). Then, the first tamper 38a and the second tamper 38b move to positions corresponding to the offset amounts determined by the processing unit 801 of the control unit 80, respectively. As a result, the position of the sheet bundle B in the direction A is shifted.

  Then, after the position of the sheet bundle B is shifted, the first eject roll 39a descends again from the position P1 (in the direction of arrow Q1 in FIG. 2), and the sheet bundle B is sandwiched together with the second eject roll 39b. In this state, the first eject roll 39a and the second eject roll 39b rotate to discharge the sheet bundle B to the stacking unit 70.

<Modification>
In the above-described example, it has been described that the offset amount is changed according to the binding angle α. However, if the offset amount changes according to the binding angle α, the offset amount may be changed in consideration of not only the binding angle α but also the mode of the sheet bundle B.

Here, in addition to the binding angle α, an aspect in which the offset amount is changed according to the width of the sheet bundle B, which is an example of the form of the sheet bundle B, and the number of sheets S constituting the sheet bundle B will be described.
First, the width of the sheet bundle B will be described.
In the sheet bundle B stacked on the stacking unit 70, the sheet width (the arrow W1 in FIG. 8) is the length in the direction (arrow A direction) intersecting the transport direction of the sheet bundle B (see the third traveling direction S3). The smaller the (see), the more the sheet bundle B stacked on the stacking unit 70 becomes more unstable.

Therefore, the offset amount is adjusted according to the sheet width, which is an example of the length of the sheet bundle B in the direction intersecting the conveyance direction of the sheet bundle B. For example, the offset amount is adjusted to be smaller as the paper width is smaller.
Alternatively, when the paper width is equal to or smaller than a predetermined value, the offset amount is set to zero. That is, as described above, by offsetting the sheet bundle B, the area where the sheet bundles B stacked on the stacking unit 70 overlap with each other can be reduced and the sheet bundle B can become unstable. When the stability of B is low, the offset itself is prohibited. By not performing the offset, for example, the tongue 522 of the binding portion 51 is suppressed from being damaged when the sheet bundle B is offset.

Next, the number of sheets S constituting the sheet bundle B will be described with reference to FIG. FIG. 10 is an explanatory diagram showing the relationship between the thickness of the sheet bundle B and the tongue 522.
First, as shown in FIG. 10, the tongue portion 522 of the binding portion 51 is inserted into the slit 521 while being bent at one end portion 522a. Accordingly, as the number of sheets S constituting the sheet bundle B increases and the thickness of the sheet bundle B increases, the sheet from the tip (the other end 522b) of the tongue 522 to the root (one end 522a) of the tongue 522. The distance along the surface of the bundle B (hereinafter, the length of the tongue 522) is shortened.

  More specifically, in the example shown in FIG. 10A, the length of the tongue 522 formed on the sheet bundle B having the thickness T1 is the length L5. On the other hand, in the example shown in FIG. 10B, the sheet bundle B has a thickness T3 that is thicker than the thickness T1. And the length L7 of the tongue part 522 formed in this sheet bundle of thickness T3 is shorter than the length L5 shown to Fig.10 (a).

  Therefore, the offset amount is adjusted according to the number of sheets S in the sheet bundle B (or the thickness of the sheet bundle B). For example, the offset amount is adjusted to be smaller as the number of sheets S in the sheet bundle B is larger. Specifically, for example, when the number of sheets S in the sheet bundle B is 2, the offset amount is 20 mm, and when the number of sheets S is 15, the offset amount is 15 mm.

  Alternatively, when the number of sheets S in the sheet bundle B is equal to or less than a predetermined value, the offset amount is set to zero. That is, as described above, the sheet bundle B stacked on the stacking unit 70 can become unstable as the offset amount increases. Therefore, when the length of the tongue 522 is long and the offset amount is large, the offset itself. Is prohibited. In addition, by not performing offset itself, it is suppressed that the tongue part 522 receives damage, for example.

Next, a configuration in which the offset amount is changed according to the binding angle α, the sheet width, and the number of sheets S constituting the sheet bundle B will be described.
In other words, the storage unit 802 (see FIG. 4) stores an offset table that defines the binding angle α, the sheet width, the number of sheets S, and the offset amount, and the processing unit 801 refers to this table, thereby offset. Determine the amount.

Here, the offset table stored in the storage unit 802 (see FIG. 4) will be described with reference to FIG. FIG. 11 is a diagram illustrating another example of the offset table stored in the storage unit 802.
As illustrated in FIG. 11, the offset table includes “binding angle”, “number of sheets”, “width”, and “offset” as items.

“Binding angle” indicates the binding angle α. In the illustrated example, there are “90 degrees”, “45 degrees”, and “0 degrees”.
“Number of sheets” indicates the number of sheets S constituting the sheet bundle B. In the illustrated example, it is determined in relation to a predetermined first value Xa, and “> Xa” is greater than the first value Xa, and “≦ Xa” is less than or equal to the first value Xa. It is.
“Width” indicates the paper width. In the illustrated example, it is determined in relation to a predetermined second value Wa, and “> Wa” is greater than the second value Wa, and “≦ Wa” is less than or equal to the second value Wa. It is.
“Offset” indicates an offset amount. In the illustrated example, the offset amount H1 (see FIG. 8A) is “H1”, the offset amount H2 (see FIG. 8B) is “H2”, and the offset amount H3 (see FIG. 8C). “H3” is “0” when no offset is performed (the offset amount is zero).

  For example, when the “binding angle” is “90 degrees”, the “number of sheets” is “> Xa”, and the “width” is “> Wa”, the “offset” is “H2”. Accordingly, the processing unit 801 refers to this table under the same condition, and is determined as the offset amount H2.

Here, as an aspect of the sheet bundle B, the offset amount is changed according to the sheet width and the number of sheets S. However, the aspect of the sheet bundle B is not limited thereto.
For example, the offset amount may be changed depending on the type of paper S (plain paper / coated paper, etc.). For example, in the case of coated paper, the offset amount is reduced because the stability of the stacked paper bundle B can be lowered compared to plain paper because the sheets S are easily misaligned.

Alternatively, the offset amount may be changed depending on the size (horizontal dimension, vertical dimension) and orientation of the paper S. As the size of the paper S becomes smaller, the stability of the stacked paper bundle B can be lowered, so the offset amount is made smaller.
Further, the offset amount may be changed depending on the rigidity of the paper S. Since the length of the tongue 522 can be shortened as the rigidity of the paper S increases, the offset amount is further reduced.

<Other variations>
Next, another modification will be described with reference to FIG. FIG. 12 is an explanatory view showing a modification in which two binding portions 51 are formed on the sheet bundle B.
First, in the above description, it has been described that one binding portion 51 is formed in the sheet bundle B. However, if the offset amount changes according to the binding angle α, a plurality of binding portions are included in the sheet bundle B. Of course, 51 may be formed.

Here, as shown in FIG. 12, when a plurality of binding portions 51 are formed in the sheet bundle B, any one of the binding portions 51 may be arranged so as to be shifted from the binding portion 51 of the other sheet bundle B.
Also, as shown in FIG. 12, when two binding portions 51 having a binding angle α of 90 degrees are formed, for example, the tongue 522 faces the center side in the width direction of the sheet bundle B (see arrow A). It is formed. For example, as shown in FIG. 6A, the distance W2 between the binding holes 523 is an interval at which file binding is possible with reference to a case where one binding portion 51 is arranged close to the end of the sheet bundle B. In this way, the binding portion 51 is arranged close to the center side in the width direction (see arrow A) of the sheet bundle B.

  Accordingly, the offset amount H4 in the example shown in FIG. 12 is larger than the offset amount H1 in the case where one binding portion 51 having a binding angle α shown in FIG. From this, for example, the offset amount may be changed depending on whether the number of binding portions 51 formed on one sheet bundle B is one or two.

Next, still another modification will be described with reference to FIG. FIG. 13 is an explanatory diagram showing the relationship between the binding portion 51 and the offset amount.
In the above description, the entire binding portion 51 has been described as an aspect in which the upper and lower sheet bundles B are not in contact with each other. However, any configuration may be used as long as the tongue portions 522 in the binding portion 51 do not overlap each other.
Therefore, as illustrated in FIG. 13, for example, the binding hole 523 in the binding portion 51 may be overlapped with the upper and lower sheet bundles B.

Here, the offset amount H5 shown in FIG. 13A is smaller than the offset amount H1 (see FIG. 8A). Further, the offset amount H6 shown in FIG. 13B is smaller than the offset amount H2 (see FIG. 8B). The offset amount H7 shown in FIG. 13C is equivalent to the offset amount H3 (see FIG. 8C).
Therefore, according to the mode shown in FIG. 13, for example, the offset amount can be suppressed as compared with the mode shown in FIG. 8, and the stacked paper bundle B is more stable.

<Others>
Now, another example of the binding portion 51 will be described with reference to FIG. Here, FIG. 14 is an explanatory diagram showing another example of the binding portion 51.
In the above description, as shown in FIG. 6 and the like, the binding portion 51 when the binding angle α is 90 degrees, 45 degrees, and 0 degrees has been described. However, the binding angle α can be arbitrarily determined. It is not limited to these angles.

For example, as shown in FIG. 14A, it may be a binding portion 51 when the binding angle α is 135 degrees, or the binding angle α is −45 degrees as shown in FIG. In this case, the binding portion 51 may be used.
Here, when the binding portion 51 shown in FIGS. 14A and 14B is compared with the binding portion 51 shown in FIG. 6B, for example, the binding portion 51 shown in FIG. The arrangement is such that the sheet S (see FIG. 5) constituting the sheet bundle B protrudes toward the center. Accordingly, the binding portion 51 shown in FIGS. 14A and 14B is further suppressed from overlapping with the image formed on the paper S (see FIG. 5).

  In the above description, the configuration in which the binding angle α is changed in the sheet bundle B by rotating the base 503 of the stapleless binding mechanism 150 is not limited to this. For example, a configuration may be provided in which a plurality of stapleless binding mechanisms 150 having different angles with respect to the sheet bundle B of the binding portion 51 formed by each are provided around the compile stacking unit 35 (see FIG. 3). The needleless binding mechanism 150 is selected and used according to the binding angle α of the binding portion 51 formed on the sheet bundle B. In this case, the function of rotating the base 503 of the stapleless binding mechanism 150 in the drive mechanism 151 is not necessary, and the configuration of the stapleless binding mechanism 150 can be simplified.

  Further, for example, a configuration in which a stapler that performs a binding process using a stapler spelling needle together with the stapleless binding mechanism 150 may be provided around the compiling stacking unit 35 (see FIG. 3). Here, a portion bound by the stapler for the stapler by the stapler has a smaller bulge in the sheet bundle B than the binding portion 51 bound by the stapleless binding mechanism 150. Therefore, the stacked sheet bundle B is more stable when bound by the stapler than when bound by the stapleless binding mechanism 150. Therefore, the offset amount may be changed between when the binding process is performed by the stapleless binding mechanism 150 and when the staple process is performed by the stapler. For example, when performing a binding process using a stapler, the offset itself may be prohibited.

DESCRIPTION OF SYMBOLS 1 ... Image forming system, 2 ... Image forming apparatus, 3 ... Paper processing apparatus, 10 ... Conveying apparatus, 30 ... Post-processing apparatus, 34 ... Exit roll, 35 ... Stacking part for compilation, 37 ... Paddle, 38 ... Tamper, 39 DESCRIPTION OF SYMBOLS ... Eject roll, 51 ... Binding part, 69 ... Opening part, 70 ... Loading part, 80 ... Control part, 801 ... Processing part, 802 ... Memory | storage part, 150 ... Needleless binding mechanism, 521 ... Slit, 522 ... Tongue part, 523 ... Binding hole

Claims (7)

A notch is formed in a part of the sheet bundle, and a part of the sheet bundle is cut into a predetermined shape, thereby forming a tongue portion on the sheet bundle where one end portion is continuous with the sheet bundle. And binding means for folding the tongue and inserting the other end of the tongue into the cut to bind the sheet bundle;
Stacking means for stacking the bundle of sheets bound by the binding means;
Moving means for moving the sheet bundle in a direction intersecting with the conveying direction of the sheet bundle so that the tongue portions of the sheet bundle stacked on the stacking means do not overlap each other;
The binding means includes a binding angle changing mechanism that changes a binding angle that is an angle at which the binding means performs a binding process on the sheet bundle.
The post-processing apparatus according to claim 1, wherein the moving unit changes a distance for moving the sheet bundle in a direction intersecting with a conveyance direction of the sheet bundle according to an aspect of the tongue portion that changes depending on the binding angle.   The post-processing apparatus according to claim 1, wherein the moving unit changes a distance by which the sheet bundle is moved according to an aspect of the tongue portion and an aspect of the sheet bundle.   The post-processing apparatus according to claim 2, wherein the moving unit changes a distance by which the sheet bundle is moved according to the number of sheets constituting the sheet bundle.   4. The post-processing apparatus according to claim 3, wherein the moving unit sets the distance to move the sheet bundle to 0 when the number of sheets constituting the sheet bundle is smaller than a predetermined number.   The post-processing apparatus according to claim 2, wherein the moving unit changes a distance for moving the sheet bundle in accordance with a length of the sheet bundle in a direction intersecting with a conveyance direction of the sheet bundle.   The moving means sets the distance for moving the sheet bundle to 0 when the length of the sheet bundle in a direction intersecting the conveyance direction of the sheet bundle is shorter than a predetermined length. The post-processing apparatus according to claim 5. Image forming means for forming an image on paper;
A sheet bundle forming unit configured to stack a plurality of the sheets on which images are formed by the image forming unit to form a sheet bundle;
By forming a notch in a part of the sheet bundle formed by the sheet bundle forming means and cutting a part of the sheet bundle into a predetermined shape, a portion where one end is continuous with the sheet bundle is formed. A binding means for forming a tongue portion to be left in the paper bundle, folding the tongue portion, inserting the other end of the tongue portion into the cut, and binding the paper bundle;
Stacking means for stacking the bundle of sheets bound by the binding means;
Moving means for moving the sheet bundle in a direction intersecting with the conveying direction of the sheet bundle so that the tongue portions of the sheet bundle stacked on the stacking means do not overlap each other;
The binding means includes a binding angle changing mechanism that changes a binding angle that is an angle at which the binding means performs a binding process on the sheet bundle.
The image forming system according to claim 1, wherein the moving unit changes a distance for moving the sheet bundle in a direction intersecting with a conveyance direction of the sheet bundle in accordance with an aspect of the tongue portion that changes depending on the binding angle.

Images