JP2017206388A - Sheet processing device and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide press-binding that is hardly separated when a sheet is rewound without changing a mechanism for press-binding.SOLUTION: A sheet processing device includes: a branch path for collecting sheets that are conveyed; and a binding device for binding a sheet bundle 272 collected in the branch path by pressurizing it using a denture mold having a plurality of crimping parts. When a corner 272d of the sheet bundle 272 is bound by the binding device, an angle θ formed between a longitudinal direction of a pressure connection mark 281 formed in the sheet bundle 272 by the crimping parts and one side of the corner 272d of the sheet bundle 272 is almost 30-60 degrees.SELECTED DRAWING: Figure 22

Description

The present invention relates to a sheet processing apparatus and an image forming system, and particularly to sheet-like recording media such as paper, transfer paper, and sheets (hereinafter referred to as “sheets” including claims). Image forming apparatus including a sheet processing apparatus that executes binding processing, a sheet processing apparatus, and an image forming apparatus such as a copier, a printer, a facsimile, or a digital multifunction peripheral having at least two of these functions combined About the system.

After an image is formed by an image forming device such as a copier, printer, or digital multifunction peripheral (MFP), the sheets discharged outside the device are once stacked on the stacking tray and aligned, and then the metal needle is inserted. 2. Description of the Related Art A sheet post-processing apparatus that performs a binding process with a stapler to be used, a so-called finisher is widely known. Since this apparatus is unattended on a sheet after image formation and automatically executes a large number of binding processes, it is widely used because it is convenient and efficient.

Further, in recent years, without performing the binding process with a metal needle, the stacked sheets are pressed with a tooth mold,
There are also known hand staplers that use a binding tool that joins sheets together by squeezing the fibers of the sheet, or a binding tool that uses half-cutting, cutting, bending, and passing through holes. ing. This type of binding tool suppresses supply consumption, facilitates recycling, and further has an advantage that it can be shredded as it is because it does not use a metal needle. In the following description, a binding method in which the overlapped sheets are pressed by a pair of tooth molds (crimping molds) and the fibers of the sheets are entangled by applying a squeeze to join the sheets together is referred to as crimp binding. Such a binding process by pressure binding has the above-mentioned advantages, and is expected to be widely used in finishers that perform post-processing.

However, the crimping binding is weaker than the binding using the conventional metal needle, and if the sheet bundle subjected to the binding process is handled in a complicated manner, the binding may be removed. Therefore, for example, in Japanese Patent Application Laid-Open No. 2004-155537 (Patent Document 1), the number and arrangement of the tooth pattern irregularities are changed depending on the condition of the sheet bundle to which the binding process is performed in order to obtain the binding strength of the crimped binding. An invention has been proposed.

By the way, in the case of crimping binding, it is possible to increase the crimping strength to some extent by increasing the crimping binding (pressing force of the tooth mold). However, a large force is required to drive the binding processing unit. For this reason, the motor and the diaphragm mechanism are enlarged or complicated, resulting in an increase in the size and cost of the finisher. Further, as described above, although it is possible to increase the strength to a certain degree, the strength cannot be increased as much as when the metal staple is bound.

Further, as in the technique described in Patent Document 1, when the number and arrangement of the tooth-shaped irregularities are changed, a mechanism for changing the number of irregularities and a mechanism for changing the arrangement of the irregularities are required. It becomes complicated. As a result, mounting on a low-cost post-processing machine is difficult both in terms of size and cost. The technique described in Patent Document 1 is mainly intended to enhance the binding strength, and is not particularly considered as to whether the binding process is easily peeled off or difficult to peel off. In addition, although mentioned later, it will not become difficult to peel only by strong binding strength.

Therefore, the problem to be solved by the present invention is to realize crimping binding that does not easily peel off when a sheet is rolled without changing the mechanism of crimping binding.

In order to solve the above problems, the present invention includes a stacking unit that stacks conveyed sheets, and a binding unit that presses and binds a bundle of sheets stacked on the stacking unit with a plurality of pressure-bonding units.
When a corner portion of a sheet is bound by the binding unit, an angle formed by a longitudinal direction of a crimp mark formed on the sheet by the crimp portion and one side of the corner portion of the sheet is approximately It is 30 to 60 degrees. Note that problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

ADVANTAGE OF THE INVENTION According to this invention, the crimping binding which is hard to be peeled when a sheet is rolled can be implement | achieved, without changing the mechanism of crimping binding.

It is a figure which shows the two aspects of the image forming system which concerns on embodiment of this invention. FIG. 2 is a plan view of the sheet post-processing apparatus in FIG. 1. FIG. 2 is a front view of the sheet post-processing apparatus in FIG. 1. It is a figure which shows the principal part of the sheet post-processing apparatus centering on a branch claw when the branch claw in FIG. 3 is a sheet conveyance state. It is a figure which shows the principal part of the sheet | seat post-processing apparatus centering on a branch claw when the branch claw in FIG. 3 switches a sheet back. It is a figure which shows the state at the time of the non-binding of a binding tool. It is a figure which shows the state at the time of binding of the binding tool of FIG. FIG. 10 is an operation explanatory diagram illustrating a state when an initial operation is completed when online binding is performed by the sheet post-processing apparatus. FIG. 9 is an operation explanatory diagram illustrating a state immediately after the first sheet is discharged from the image forming apparatus and loaded into the sheet post-processing apparatus from the state of FIG. 8. FIG. 10 is an operation explanatory diagram illustrating a state when the trailing edge of the sheet is separated from the nip of the entrance roller and exceeds the branch path from the state of FIG. 9. FIG. 11 is an operation explanatory diagram illustrating a state when the sheet is switched back from the state of FIG. 10 to align the sheet conveyance direction. FIG. 12 is an operation explanatory diagram showing a state when the first sheet is made to wait on the branch path from the state of FIG. 11 and the next second sheet is carried in. It is operation | movement explanatory drawing which shows a state when the 2nd sheet | seat is carried in from the state of FIG. FIG. 14 is an operation explanatory diagram illustrating a state when the final sheet is aligned to form a sheet bundle from the state of FIG. 13. It is operation | movement explanatory drawing which shows a state when performing the binding operation | movement time from the state of FIG. FIG. 16 is an operation explanatory diagram illustrating a state when a sheet bundle is discharged from the state of FIG. 15. It is a figure which shows an example of the tooth type of a binding tool. It is a principal part front view of the sheet | seat bundle which shows the state of the conventional crimping | combination binding to which the sheet | seat bundle was crimped | bonded. It is a figure which shows a state when a sheet | seat is rolled perpendicularly with respect to the arrangement | sequence of the crimping | compression-bonding process part of the sheet | seat bundle in the conventional crimping binding. It is a figure which shows the state when a sheet is rolled in parallel with respect to the arrangement | sequence of the crimping | compression-bonding process part of the sheet | seat bundle in the conventional crimping binding. It is a figure which shows a state when a sheet | seat is rolled diagonally with respect to the arrangement | sequence of the crimping | compression-bonding process part of the sheet | seat bundle in the conventional crimping binding. It is explanatory drawing which shows the state of the crimping | compression-bonding mark in Example 1 which was made to perform crimping binding with the arrangement | sequence so that the row direction of a crimping | compression-bonding mark became perpendicular | vertical with respect to a diagonal line. FIG. 4 is a diagram illustrating a state when a sheet is rolled vertically with respect to an upper end portion of a sheet bundle according to the first exemplary embodiment. FIG. 5 is a diagram illustrating a state when a sheet is rolled in parallel with the upper end portion of the sheet bundle in the first exemplary embodiment. FIG. 6 is a diagram illustrating a state when a sheet is rolled in an oblique direction with respect to an upper end portion of a sheet bundle in the first exemplary embodiment. FIG. 6 is a front view of a main part of a sheet bundle showing a state in which crimp binding is applied to the sheet bundle in Example 2. FIG. 10 is a front view of a main part of a sheet bundle showing a state in which crimped binding is applied to the sheet bundle in Example 3.

The present invention determines the binding direction (the direction of a plurality of crimping portions (tooth molds)) according to the curl (peeling) direction of the sheets of the sheet bundle, and realizes crimping binding that is difficult to remove without changing the mechanism of crimping binding. It is characterized by. Hereinafter, embodiments of the present invention will be described with reference to the drawings. Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

FIG. 1 is a diagram showing two aspects of an image forming system according to an embodiment of the present invention. An image forming system 100 according to the present embodiment includes an image forming apparatus 101 and a sheet post-processing apparatus (finisher) 201 as a sheet processing apparatus. The sheet post-processing apparatus 201 is a so-called conveyance path binding apparatus provided in a sheet conveyance path in which the binding apparatus discharges a sheet from the image forming apparatus 101. FIG. 1A illustrates a mode in which the image forming apparatus 101 is installed in the conveyance path.
(B) shows the aspect installed outside a conveyance path, respectively. The sheet post-processing apparatus 201 has an alignment function for stacking and aligning sheets in the conveyance path, and a binding function for binding the aligned sheet bundle in the conveyance path. The mode of FIG. 1A is also called an in-cylinder processing apparatus because it is post-processed in the cylinder of the image forming apparatus 101. As described above, the sheet post-processing apparatus 201 according to the present embodiment is small in size, and can be easily attached in the cylinder or on the side according to the form of the image forming apparatus 101.
Alternatively, it can be arranged.

The image forming apparatus 101 includes an image forming engine unit 102 including an image processing unit and a paper feeding unit, a reading engine unit 103 that reads an image and converts it into image data, and a reading engine unit 1.
An automatic document feeder (ADF) 104 that automatically feeds a document to be read to 03 is provided. In the mode of FIG. 1A, a sheet discharge unit is provided in the cylinder of the image forming apparatus 101 to discharge the sheet after image formation. In the mode of FIG. 1B, the sheet after image formation is the image forming apparatus. A paper discharge unit is provided outside of 101.

2 is a plan view of the sheet post-processing apparatus 201 in FIG. 1, and FIG. 3 is a front view. 2 and 3, the sheet post-processing apparatus 201 includes an entrance sensor 202, an entrance roller 203, a branching claw 204, a binding tool 210, and a paper discharge roller 205 from the entrance side along the sheet conveyance path 240. The entrance sensor 202 detects the leading edge, the trailing edge, and the presence / absence of a sheet discharged from the discharge roller of the image forming apparatus 101 and carried into the sheet post-processing apparatus 201. As the entrance sensor 202, for example, a reflection type optical sensor is used. Note that a transmissive optical sensor may be used instead of the reflective optical sensor. The entrance roller 203 is located at the entrance of the sheet post-processing apparatus 201, and has a function of receiving a sheet discharged by the discharge roller of the image forming apparatus 101 and carrying it into a binding tool (stapling apparatus) 210. Moreover, although mentioned later, the drive source (drive motor) which can control a stop, rotation, and conveyance amount and CPU (not shown) which controls this drive source are also provided. The entrance roller 203 abuts the leading end portion of the sheet conveyed from the image forming apparatus 101 side to the nip with the pair of rollers, and also performs skew correction.

A branching claw 204 is disposed at the subsequent stage of the entrance roller 203. The branch claw 204 is provided to guide the rear end of the sheet to the branch path 241. In this case, the rear end of the sheet is the branch claw 20
After exceeding 4, the branching claw 204 rotates clockwise in FIG. 3 and conveys the sheet in the direction opposite to the loading direction. Thereby, the sheet rear end side is guided to the branch path 241 side. Branch nail 2
As will be described later, 04 is driven by a solenoid and swings. A motor can be used instead of the solenoid. The branching claw 204 is driven in the counterclockwise direction in FIG. 3 and can press the sheet or the sheet bundle against the conveying surface of the branching path 241 when rotated. Thereby, the branching claw 204 can fix the sheet or the sheet bundle by the branching path 241.

A sheet discharge roller 205 is located immediately before the last exit of the sheet conveyance path 240 of the sheet post-processing apparatus 201 and has a function of conveying, shifting, and discharging the sheet. Further, similarly to the entrance roller 203, a drive source (drive motor) capable of controlling the stop, rotation, and conveyance amount of the paper discharge roller 205 is provided, and this drive source is controlled by the CPU (not shown). The paper discharge roller 205 is shifted by a shift mechanism 205M. The shift mechanism 205M includes a shift link 206, a shift cam 207, a shift cam stud 208, and a shift home position sensor 209.

The shift link 206 is provided at the shaft end 205a of the paper discharge roller 205 and receives a shift moving force. The shift cam 207 has a shift cam stud 208 and is a rotating disk-shaped part. The rotation of this part causes the shift link long hole 2 to pass through the shift cam stud 208.
The sheet discharge roller 205 movably inserted in 07a is moved in a direction orthogonal to the sheet conveying direction. This movement is a so-called shift. The shift cam stud 208 functions in conjunction with the shift link elongated hole portion 207 a to convert the rotational motion of the shift cam 207 into the linear motion of the paper discharge roller 205 in the axial direction. The shift home position sensor 209 detects the position of the shift link 206, sets the position detected by the shift home position sensor 209 as the home position, and executes rotation control of the shift cam 207 with reference to the home position. This control is executed by the CPU.

The binding tool 210 includes a sheet end detection sensor 220, a binding tool home position sensor 221 and a guide rail 230 for moving the binding tool. The binding tool 210 is a sheet bundle PB.
A mechanism that binds (same as a sheet bundle 272 in an embodiment described later), and is a so-called stapler. In this embodiment, the sheet is deformed by being sandwiched between a pair of tooth molds 261 and pressurized, and a function of binding and binding the fibers of the sheet is provided. This type of binding is also referred to as crimp binding. In addition to this binding method, a hand stapler that uses a binding tool such as half-punching, cutting, bending, and passing through a hole is also known. In any case, supply consumption can be reduced or it can be easily recycled, and it can be directly shredded. For this reason, it is desired that a sheet post-processing apparatus, that is, a so-called finisher, be mounted with a stapler that does not use a metal needle and can perform binding processing by a single sheet, such as crimp binding.

As a hand stapler for performing crimp binding, for example, a binding tool disclosed in Japanese Utility Model Publication No. 36-13206 is known, and as a hand stapler for cutting and bending and binding it through a hole, for example, Japanese Utility Model Publication 37-7208 is disclosed. The binding tool disclosed in the Japanese Patent Publication is known.

The sheet edge detection sensor 220 is a sensor for detecting the side edge of the sheet. When the sheets are aligned, the sensor detection position is aligned with the reference. The binding tool home position sensor 221 detects the position of the binding tool that can move in the sheet width direction. The home position is a position where the binding tool 210 is located at a position that does not interfere with the conveyance of the maximum size sheet. The position is detected. The guide rail 230 is a rail that guides the movement of the binding tool 210 so that the binding tool 210 can move stably in the sheet width direction. The guide rail 230 is
The binding tool 210 is installed so as to be movable in a direction perpendicular to the sheet conveyance direction of the sheet conveyance path 240 of the sheet post-processing apparatus 201 from the home position to a position where a sheet having a minimum sheet size can be bound. The binding tool 210 moves along the guide rail 230 by a moving mechanism including a drive motor (not shown).

The sheet conveyance path 240 is a conveyance path for conveying and discharging the received sheet, and penetrates from the inlet side to the outlet side of the sheet post-processing apparatus 201. The branch path 241 is a transport path that reversely transports the sheet (switches back) and carries it in from the rear end side, and branches from the transport 240. The branch path 241 is provided for stacking and aligning sheets, and functions as a stacking unit. The abutting surface 242 is a reference surface that is provided at the end of the branch path 241 and abuts and aligns the rear end of the sheet. In this embodiment, the tooth mold 261 is a pressure nipping material having a shape in which a pair of concaves and convexes meshes with each other, and has a function of sandwiching and pressing the sheet bundle PB and performing pressure binding.

4 and 5 are diagrams showing the main part of the sheet post-processing apparatus 201 with the branching claw 204 as the center. FIG. 4 shows details of the related mechanism when the branching claw 204 is in sheet conveyance, and FIG. 5 shows details of the related mechanism when the sheet is switched back. The branching claw 204 is provided so as to be able to swing within an angle range set in advance with respect to the support shaft 204b in order to switch the sheet transporting path to either the sheet transporting path 240 or the branching path 241. The branching claw 204 is a position where the sheet received from the right side in the drawing can be conveyed downstream without resistance, that is, the position shown in FIG. 4 is the home position, and is always elastically pressed counterclockwise by the spring 251 in the drawing. Has been.

The spring 251 is hung on the branch claw movable lever portion 204a, and the branch claw movable lever portion 20 is engaged.
A plunger of a branch solenoid 250 is connected to 4a. The branch conveyance path 241
When the state of FIG. 4 is reached after the sheet is conveyed to the branch conveyance path 241 in the state of FIG. 5, the branching claw 204 can hold the sheet in the branch conveyance path 241 in a sandwiched state. The transfer path is switched by turning on / off the branch solenoid 250. That is, when the branch solenoid 250 is turned on, the branch claw 204 rotates in the direction of the arrow R1 in FIG. 5, and the sheet can be guided to the branch path 241 by closing the sheet conveying path 240 and opening the branch path 241.

6 and 7 are diagrams showing details of the binding tool 210 according to the present embodiment. The binding tool 210 includes a tooth mold 261, a pressure lever 262, a link group 263, a drive motor 265, and an eccentric cam 266.
And a cam home position sensor 267 as a component. The tooth mold 261 is a pressurizing member having a shape in which the upper and lower pairs are engaged with each other. The tooth mold 261 is located at the operating end of the link group 263 combined in plural, and is contacted and separated by the pressurizing and releasing operation of the pressurizing lever 262 which is the operating end.

The pressure lever 262 is rotated by a rotating eccentric cam 266. This eccentric cam 266
Is rotated by a driving force applied from a driving motor 265, and a cam home position sensor 267 is rotated.
The rotational position of the cam is controlled based on the detected information. The rotational position defines the distance between the rotating shaft 266a of the eccentric cam 266 and the cam surface, and the pressing amount of the pressure lever 262 is determined based on this distance. The position where the cam home position sensor 267 detects the filler 266b that is the detection target of the eccentric cam 266 is the home position. As shown in FIG.
When the rotational position 6 is at the home position, the tooth mold 261 is in an open state. In this state, the binding process is impossible and the sheet bundle can be received.

When binding the sheet bundle, the sheet bundle is inserted between the tooth molds 261 with the tooth mold 261 shown in FIG. 6 open, and the drive motor 265 is rotated. When the drive motor 265 starts rotating, the eccentric cam 266 rotates in the direction of arrow R2 in FIG. In response to this rotation, the eccentric cam 26
6 is displaced, and the pressure lever 262 rotates in the direction of the arrow R3 in the figure. The rotational force is
The force is increased through the link group using the lever and is transmitted to the tooth pattern 261 at the operating end.

When the eccentric cam 266 rotates by a certain amount, the upper and lower tooth molds 261 mesh with each other, pinch the sheet bundle, and pressurize it. The sheet bundle is deformed by this pressurization, and fibers between adjacent sheets are entangled and bound. Thereafter, the drive motor 265 rotates in the reverse direction and stops at the detection information of the cam home position sensor 267. As a result, the upper and lower tooth molds 261 return to the state shown in FIG. 6, and the sheet bundle can be moved. Further, the pressure lever 262 has a spring property, and bends when an overload is applied, thereby releasing the overload.

FIG. 8 to FIG. 16 are operation explanatory views showing the online binding operation by the binding tool 210 of the sheet post-processing apparatus 201. In each figure, (a) is a plan view and (b) is a front view. Further, in the present embodiment, online binding refers to a sheet post-processing device 201 installed at a paper discharge port of the image forming apparatus 101 as shown in FIG. 201 is continuously received and matched, and binding processing is performed. On the other hand, manual binding, which will be described later, is for binding a sheet printed out from the image forming apparatus 101 or a sheet printed out separately by the binding tool 210 of the sheet post-processing apparatus 201. Manual binding is not included in the offline binding because it is not performed by a series of operations from the discharge of the image forming apparatus 101.

FIG. 8 is a diagram illustrating a state when the initial operation of the online binding operation is completed. When output of an image-formed sheet is started from the image forming apparatus 101, each unit moves to the home position, and the initial process (operation) is completed. FIG. 8 shows the state at this time.

In FIG. 9, the first sheet P <b> 1 is discharged from the image forming apparatus 101 and the sheet post-processing apparatus 20.
It is a figure which shows the state immediately after carrying in to 1. The first sheet P1 from the image forming apparatus 101
Before the sheet is loaded into the sheet post-processing apparatus 201, the CPU of the sheet post-processing apparatus 201 receives the mode information and sheet information related to the sheet processing control mode from the CPU of the image forming apparatus 101, and based on this information, the CPU waits for reception. become.

In the control mode, three modes, a straight mode, a shift mode, and a binding mode, are set. In the straight mode, after the entrance roller 203 and the paper discharge roller 205 start rotating in the sheet conveyance direction, the sheets P1,... Pn are sequentially conveyed, discharged, and the final paper Pn is discharged. Then, the entrance roller 203 and the paper discharge roller 205 are stopped. Note that n is a positive integer of 2 or more.

In the shift mode, the entrance roller 203 and the paper discharge roller 205 are in an acceptance standby state.
Starts rotating in the transport direction. In the shift paper discharge operation, the first sheet P1 is received and conveyed, and when the rear end of the first sheet P1 passes through the entrance roller 203, the shift cam 207 is moved.
Rotates a certain amount, and the paper discharge roller 205 moves in the axial direction. At this time, the first sheet P1 also moves with the movement of the paper discharge roller 205. When the first sheet P1 is discharged, the shift cam 207 rotates to return to the home position, and prepares for the next loading of the second sheet P2. This shift operation of the paper discharge roller 205 is repeated until the discharge of the nth (final) sheet Pn of the same portion is completed. As a result, the sheet bundle PB for one copy (one book) is discharged and stacked while being shifted to one side. When the first sheet 1P of the next part is carried in, the shift cam 207 rotates in the opposite direction to the previous part, and the sheet P1 moves to the opposite side to the previous part and is discharged.

In the binding mode, the entrance roller 203 is stopped in the acceptance standby state, and the paper discharge roller 205 starts to rotate in the transport direction. Further, the binding tool 210 moves to a standby position that is retracted by a certain amount from the sheet width and stands by. In this case, the entrance roller 203 also functions as a registration roller. That is, the first sheet P1 is carried into the sheet post-processing apparatus 201, the leading edge of the sheet is detected by the entrance sensor 202, and further strikes the nip of the entrance roller 203. Then, the first sheet P1 is conveyed by the discharge roller 102 of the image forming apparatus 101 by a distance that causes a certain amount of bending from the abutted position. After being transported by the distance, the entrance roller 203 starts to rotate. Thereby, the skew correction of the first sheet P1 is performed. FIGS. 9A and 9B show the state at this time.

FIG. 10 is a diagram illustrating a state when the trailing edge of the sheet leaves the nip of the entrance roller 203 and exceeds the branch path 241. The conveyance amount of the first sheet P1 is determined by the entrance sensor 20 at the rear end of the sheet.
2 is counted based on the detection information by the CPU 201a.
Is grasped by. When the trailing edge of the sheet passes through the nip of the entrance roller 203, the entrance roller 203 stops rotating for receiving the next second sheet P2. At the same timing, the shift cam 207 rotates in the direction of the arrow R4 in FIG.
In a state where the first sheet P1 is nipped, the paper discharge roller 205 starts to move in the axial direction. As a result, the first sheet P1 is conveyed while being skewed in the direction of arrow D1 in FIG. After that, when the sheet end detection sensor 220 provided or incorporated in the binding tool 210 detects the side end portion of the sheet P, the shift cam 207 stops and then reverses, and the sheet end detection sensor 220 is detected.
However, the shift cam 207 stops when the sheet P is not detected. Then, the operation is completed, and the discharge roller 205 stops at a predetermined position where the trailing edge of the sheet has passed the leading edge of the branching claw 204.

FIG. 11 is a diagram illustrating a state when the sheet P1 is switched back to align the conveyance direction of the sheet P1. From the state shown in FIG. 10, the branch claw 204 is rotated in the direction indicated by the arrow R5 to switch the conveyance path to the branch path 241, and then the paper discharge roller 205 is rotated in the reverse direction. As a result, the first sheet P1 is switched back in the direction of the arrow D2, and the rear end of the sheet is carried into the branch path 241 and further abutted against the abutting surface 242. The abutting of the trailing edge of the sheet aligns the trailing edge of the sheet with the abutting surface 242 as a reference. When the first sheet P1 is aligned, the paper discharge roller 205 stops. At this time, the paper discharge roller 205 slips when the first sheet P1 hits the abutting surface 242, so that no conveying force is applied. That is, when the first sheet P1 switches back and hits the abutting surface 242 and the rear end of the sheet is aligned with the abutting surface 242 as a reference, the sheet P1 is set so as to be further conveyed and not buckled. ing.

FIG. 12 is a diagram illustrating a state where the first sheet P1 is made to wait on the branch path 241 and the next second sheet P2 is carried in. After the preceding first sheet P1 is aligned with the abutting surface 242 as a reference, the branch claw 204 is rotated in the direction of the arrow R6 in the figure. As a result, the branch path 24
The contact surface 204c, which is the lower surface of the branching claw 204, is located at the rear end of the sheet located at the branching path 241.
Hold it firmly on the surface of the machine and keep it stationary. When the succeeding second sheet P2 is carried in from the image forming apparatus 101, skew correction is performed by the entrance roller 203 in the same manner as the preceding first sheet P1. Next, at the same time as the rotation of the entrance roller 203 starts, the paper discharge roller 205 also starts to rotate in the transport direction.

FIG. 13 is a diagram illustrating a state when the second sheet P2 is carried in. When the second sheet P2 and the third and subsequent sheets P3,..., Pn are conveyed from the state shown in FIG. 12, the operations shown in FIGS. The sheets conveyed from the forming apparatus 101 are moved to a preset position and overlapped, and the aligned sheet bundle P
B is stacked in the sheet conveyance path 240.

FIG. 14 is a diagram illustrating a state when the sheet bundle PB is formed by aligning the final sheet Pn. When the operation of the final sheet Pn as the aligned sheet bundle PB is completed, the discharge roller 205 is rotated by a certain amount in the transport direction and stopped. With this operation, the bending that occurs when the rear end of the sheet is abutted against the abutting surface 242 is eliminated. Thereafter, the branching claw 204 is rotated in the direction indicated by the arrow R5, and the contact surface 204c is separated from the branching path 241 to release the pressure applied to the sheet bundle PB. As a result, the sheet bundle PB is released from the restraining force by the branching claw 204, and the sheet discharge roller 205.
It becomes possible to carry by.

FIG. 15 is a diagram illustrating a state during the binding operation. The sheet discharge roller 205 is rotated in the conveyance direction from the state shown in FIG. 14, and the sheet bundle PB is conveyed by a distance where the position of the tooth mold 261 of the binding tool 210 matches the binding position of the sheet bundle PB, and stopped at that position. Thereby, the processing position of the sheet bundle PB in the conveyance direction matches the position of the tooth mold 261 in the conveyance direction. Then, the binding tool 210 is moved in the direction indicated by the arrow D3 by a distance corresponding to the position where the position of the tooth mold 261 of the binding tool 210 matches the processing position of the sheet, and stopped. As a result, the processing position in the width direction of the sheet bundle PB matches the position of the tooth mold 261 in the transport direction and the width direction. At this time, the branching claw 204 rotates in the direction indicated by the arrow R6 and returns to the sheet receiving state. Thereafter, the drive motor 265 is turned on, and the tooth mold 2
The sheet bundle PB is pressurized by 61 and crimped by binding. In the present embodiment, an example using the binding tool 210 that performs crimp binding is illustrated, but a binding tool such as half-punching, cutting, bending, and passing through a hole is used. It goes without saying that it is also good.

FIG. 16 is a diagram illustrating a state when the sheet bundle PB is discharged. The sheet bundle PB bound as shown in FIG. 15 is discharged by the rotation of the paper discharge roller 205. Sheet bundle PB
Is discharged, the shift cam 207 is rotated in the direction of arrow R7 to return to the home position (position in FIG. 8). In parallel with this, the binding tool 210 is moved in the direction of the arrow D4 in the figure to return to the home position (position in FIG. 8). As a result, the binding operation is completed for the alignment operation of one (one) sheet bundle PB. If there is a next part, the operations of FIGS. 8 to 16 are repeated, and a part of the sheet bundle PB that has been crimped and bound is created in the same manner.

The outline of the crimping and binding apparatus is as described with reference to FIGS. Details of the first embodiment will be described below. Example 1 is an example in the case of crimping binding to the corners of a sheet bundle.

FIG. 17 is a diagram illustrating an example of a tooth shape of a binding tool. A pair of tooth molds 261 of the binding tool 210 is configured. FIG. 11A is a front view of one tooth mold 261 of the pair of tooth molds 261, and FIG. 10B is a plan view of FIG. is there. In this embodiment, the tooth mold 261 includes first to third tooth mold portions 261a, 261b, 261c, and the respective tooth mold portions 261a, 261b, 261 are provided.
c has the convex part 270a and the recessed part 270b. On the other hand, although the other tooth mold to be paired is not illustrated, the fourth tooth mold has a convex portion and a concave portion and meshes with each of the first to third tooth mold portions.
Or a sixth tooth mold portion. In the case of crimp binding, one tooth mold 261 shown in FIG.
The concave portion 270b of the other tooth mold is engaged with the convex portion 270a of the first tooth mold, and the concave portion 270 of one tooth mold is formed.
The convex portion 270a of the other tooth type meshes with b.

Here, the other tooth mold part meshing with the first to third tooth mold parts 261a, 261b, 261c is provided with three recesses in each tooth mold part, and the first to third tooth mold parts 26 are provided.
The convex portions 270a of 1a, 261b, and 261c mesh with the concave portions 270b with the sheet bundle interposed therebetween. As a result, each of the first to third tooth mold portions 261a, 261b, 261c,
A total of nine crimps 280 are formed. In FIG. 17, reference numeral 270
Indicates a crimping portion at the tip of the convex portion 270 a of the binding tool 210, and a crimping mark 280 is formed by the crimping portion 270.

FIG. 18 is a front view of a main part of the sheet bundle showing a state in which the sheet bundle has been crimped and bound. FIG.
As shown in FIG. 8, the binding at the upper left corner of the sheet bundle 272 (P) is crimped by the binding tool 210. The crimped portion is a crimping processing unit 271. Since the binding tool 210 shown in FIG. 17 is used, the first to third tooth mold portions 261a, 261b, 26 are used.
It is bound by nine crimping marks 280 formed by the respective tooth mold parts 1c. Nine crimping marks 280 are formed in each of the first to third tooth mold parts 261a, 261b, and 261c, and three crimping marks 280 are formed into one block, and a total of nine. This is a crimping mark 280 of the book. In other words, the crimp binding by the crimp mark 280 formed by the nine crimp parts 270 is performed.

In the following, a description will be given of the difference in the easiness of peeling or the difficulty of peeling of the crimping processing unit 271 depending on the direction in which the sheet bundle 272 is wound in the state of crimping binding shown in FIG.
As shown in FIG. 17, nine crimping portions 270 are arranged in parallel, and the tooth mold 261 of the binding tool 210.
Nine pressure-bonding marks 280 are formed by pressing the sheet bundle 272 by pressing. 19, FIG. 20 and FIG. 21 show the state of the direction in which the sheet is folded and the contact between the crimping part A (the part where the sheet is peeled off at the part of the crimping mark).

B in FIG. 19, B ′ in FIG. 20, and B ″ in FIG. 21 indicate the peeling portions of the sheets with respect to the sheet bundle 272 when the sheets are rolled, and these peeling portions B ′ and B ″.
And the contact C, C ′, C ″ between the contact mark 280 and the crimp mark 280. That is, the contacts C, C ′.
, C ″ are locations where the sheet is peeled off from the sheet bundle 272, and the contact points C, C ′, C ″.
A force is applied to peel off the sheet from the sheet bundle 272.

FIG. 19 shows a vertical direction (in the direction of arrow D4) of the crimping processing portions 271 of the sheet bundle 272 (in the direction of arrow D4).
It is a figure which shows a state when a sheet | seat is rolled up in parallel with the longitudinal direction of the crimping | compression-bonding mark 280 (arrow D1 direction). In this case, the peeling points (line connecting) B are parallel to the arrangement of the pressure-bonding processing portions 271 and there are nine contact points C on the peeling points (connecting line) B. The peeling force applied to the crimp mark 280 is reduced. As a result, the sheet is a sheet bundle 2
72 becomes difficult to peel off.

20 is parallel to the arrangement (in the direction of arrow D4) of the pressure-bonding processing portions 271 of the sheet bundle 272 (
It is a figure which shows a state when a sheet | seat is rolled up perpendicularly | vertically with respect to the longitudinal direction of the crimping | compression-bonding mark 280 (arrow D2 direction). In this case, the peeling part B ′ is parallel to the arrangement of the crimping processing parts 271 (
As shown in FIG. 20, the rightmost crimp mark 28 is perpendicular to the longitudinal direction of the crimp mark 280.
Only 0A has a contact C ′. In this case, the entire length in the longitudinal direction of one crimping mark 280 </ b> A becomes a contact point, but the entire length is significantly smaller than the arrangement dimension of the crimping processing portions 271. Therefore, 9
A force to be peeled off is applied to only one pressure-bonding mark 280A among the pressure-bonding marks 280, and the film is easily peeled off.

FIG. 21 is oblique to the arrangement (in the direction of arrow D4) of the crimping processing units 271 of the sheet bundle 272 (
It is a figure which shows the state when a sheet | seat is rolled in about 45 degree | times-about 45 degrees with respect to the longitudinal direction of the crimping | compression-bonding mark 280 (arrow D3 direction). In this case, the peeling portion B ″ is inclined with respect to the arrangement of the pressure-bonding processing portions 271, and as can be seen from FIG. 21, the rightmost pressure-bonding mark 2 among the nine pressure-bonding marks 280.
Since there is a contact C ″ only on 80A. Therefore, as in the case of FIG. 20, the force to be peeled only on one crimping mark 280A is applied, so that it is easy to peel off. In addition, in the example of FIG. Since the length is about √2 times the maximum width of the crimp mark 280A, than the case of FIG.
Furthermore, it becomes easy to peel off.

In this way, when crimp binding is performed parallel to the upper end portion 272a of the sheet bundle 272 (the arrangement of the crimp processing units 271 is parallel to the upper end portion), the ease of peeling of the sheet varies greatly depending on how the sheet is wound. End up. In the example shown in FIG. 20 and FIG.
Even if 70 is increased, it will not be difficult to peel off because it will eventually receive a peeling force at one crimp mark 280A. In such an arrangement, there is only a method for increasing the pressure-bonding strength (that is, increasing the pressure for pressure-bonding) in order to make it difficult to peel off. Increasing the pressure-bonding strength means that the configuration of the binding tool 210 is complicated or enlarged as described above.

Therefore, in the present embodiment, when the crimping processing unit 271 is set at the corner 272d of the sheet bundle 272, the longitudinal direction (arrow D5 direction) of the crimping trace 281 and the corner of the sheet bundle 272 on the side on which the binding process is performed. The angle θ formed by one side of the 272d is set to approximately 30 to 60 degrees, and the crimp mark 2
The crimp binding is performed in such an arrangement that the arrangement direction of 81 (direction of arrow D6) is perpendicular to the diagonal line 272b. FIG. 22 is an explanatory view showing the state of the crimp mark at this time.

Further, in the present embodiment, the length l1 of one crimp mark 281 is as follows: When the sheet is rolled perpendicularly to the upper end 272a of the sheet bundle 272 (in the direction of the arrow D1) The upper end 272a of the sheet bundle 272 In each case where the sheet is rolled in parallel (in the direction of arrow D2) or in the case of rolling up the sheet obliquely (in the direction of arrow D3) with respect to the upper end portion 272a of the sheet bundle 272, peeling points B, B ′, B ″ Contacts C1 ′ and C2 ′ between the sheet bundle 272 and the sheet bundle 272
, C3 ′ is set to have a length such that there are a plurality of places (two or more places). FIG. 23, FIG. 24, and FIG. 25 show the state of the press-bonding marks and the peeled portions in each case.

FIG. 23 is a diagram illustrating a state in which the sheets are rolled up perpendicularly (in the direction of the arrow D1) with respect to the upper end portion 272a of the sheet bundle 272. When the sheet is rolled up, the contact is first made only with the leftmost crimping mark 281B of the crimping processing section 271 at the position B-1, and all peeling force is applied here. When the sheet is further turned from this state, the sheet is peeled off as it is. When the position B-2 is reached, the three crimping marks 281B, 281B1, and 281 from the left of the crimping processing section 271 are displayed.
B2 has contact points C2, C2 ′, C2 ″, respectively, and the peeling force is distributed to three. Therefore, it is difficult to peel off about three times as compared with the configuration of FIGS.

In this case, the contacts C1 ′, C2 ′, C3 between the peeled portions B, B ′, B ″ and the sheet bundle 272 are used.
The length l1 of the crimp mark 281 such that 'is a plurality of places (two or more places) is equal to the adjacent crimp mark 2
It is also related to the distance d1 between 81. That is, when the distance d1 is small, the press-bonding mark 281 is obtained.
It is possible to have three contact points even if the length l1 is short. Therefore, the relationship between the length l1 of the crimping trace 281 and the distance d1 between the adjacent crimping traces 281 is experimentally obtained in various combinations by changing the shape and dimensions of the tooth mold 261, and an appropriate crimping portion 270 is obtained. It is desirable to set the length l1 in the longitudinal direction and the interval d1 between the adjacent crimping portions 270.

FIG. 24 is a diagram illustrating a state in which a sheet is rolled in parallel to the upper end portion 272a of the sheet bundle 272 (in the direction of arrow D2). When the sheet is rolled, first, the contact C3 is provided only at the position B′-1 with the rightmost crimping mark 281A of the crimping processing portion 271, and all the peeling force is applied here. When the sheet is further turned from this state, the sheet is peeled off as it is. And B
When the position “−2” is reached, the three crimping marks 281A and 281A1 from the right of the crimping processing section 271 are displayed.
, 281A2 have contact points C4, C4 ′, C4 ″, respectively, and the peeling force is distributed to three. Therefore, the peeling force is hardly tripled compared to the configuration of FIGS.

FIG. 25 is a diagram illustrating a state in which the sheet is rolled in an oblique (approximately 45 degrees) direction (arrow D3 direction) with respect to the upper end portion 272a of the sheet bundle 272. When the sheet is rolled, the sheet is wound in a direction perpendicular to the arrangement of the pressure-bonding processing sections 271 (arrow D6 direction) (corresponding to a direction parallel to the longitudinal direction of the pressure-bonding mark 281: arrow D3 direction). And if you hit a sheet,
First, at the position B ″, there is a crimp mark 281 and a contact C5 of the crimp processing section 271. This contact C5 is an end of the crimp mark 281 on the sheet curling side and is in contact with the nine crimp marks 281 almost simultaneously. Then, the sheets are peeled off sequentially along the longitudinal direction of the crimp mark 281. In other words, the state where the sheets are crimped and held with respect to the sheet bundle 272 is released. The peeling force is dispersed into nine, and the peeling force applied to one crimping trace 281 is reduced, and this state is equivalent to the state of FIG.

For this reason, as shown in FIGS. 23 to 25, the angle θ formed by the longitudinal direction of the crimp mark 281 (in the direction of the arrow D5) and one side of the corner portion 272d of the sheet bundle 272 on the binding side. When crimping and binding is performed at an angle of approximately 30 to 60 degrees, only the case of FIG. 19 is difficult to peel in correspondence with FIG. 24, but compared with the other examples shown in FIGS. 3
Double peeling can be achieved. Thereby, without complicating or increasing the size of the binding tool 210, and further without increasing the crimping strength of the binding tool 210, only by changing the direction of the crimping binding and the length of the crimping portion 270, The sheet can be made difficult to peel from the sheet bundle 272.

  Example 2 is an example in the case of crimping and binding the central portion in the width direction of the sheet bundle.

FIG. 26 is a front view of an essential part of the sheet bundle showing a state where the sheet bundle is subjected to crimping binding in the second embodiment.

In the second embodiment, the pressure-bonding processing portion 271 bonded by the pressure-bonding mark 281 shown in the first embodiment is replaced with the sheet bundle 2.
72 is an example in which one is provided at the center of the upper end portion 272a in the longitudinal direction. The tooth mold 261 is the same as that shown in FIG.

In the second embodiment, the length 11 in the longitudinal direction of the press-bonding mark 281 is longer than the length of the press-bonding mark 280 in the conventional example, and the press-processing portion 271 is a corner portion of the sheet bundle. 272
The difference is that it is not d but the center.

When the crimping processing unit 271 for crimping with the tooth mold 261 is set at the center in the sheet width direction of the upper end portion 272a in the longitudinal direction of the sheet bundle 272, the direction in which the user rolls the sheets is mostly relative to the upper end portion 272a of the sheet bundle 272. Vertical direction (arrow D1 direction) or diagonal direction (arrow D)
3 directions). Since the central portion of the sheet bundle is bound, the user hardly goes in a direction parallel to the upper end portion 272a (the direction of the arrow D2). Therefore, in the second embodiment,
The length l1 in the longitudinal direction of the crimping trace 281 was set so that there were a plurality of contacts with the crimping trace 281 when rolled.

Specifically, if the relative relationship between the crimping processing unit 271 and the turning direction is the relationship shown in FIG. 23, FIG. 24, or FIG. Therefore, the second embodiment
Then, the crimp mark 281 shown in FIG. 23, FIG. 24 or FIG. 25 is formed on the upper end 272a so that the longitudinal direction (arrow D5 direction) of the crimp mark 281 is perpendicular to the upper end 272a of the sheet bundle 272. Formed in the center. As a result, most of the arrows D
One direction or the direction of the arrow D2 is formed, and the crimp mark 281 or the crimp processing part 271 is formed.
The relative relationship in the direction of turning is the same as in FIG. Further, in the case of turning from below, the relative relationship in the direction of turning with the crimping trace 281 or the crimping processing section 271 is the same as that in FIG. In the former, contacts C2, C2 ′, C2 ″ or contacts C4, C4 ′, C4 ″ are formed at three places (plural places) when hit, and contacts C5 are formed at nine places in the latter. As a result, the peeling force is dispersed and the peeling becomes difficult.

In the second embodiment, the pressure-bonding processing section 271 is centerline 2 at the center of the sheet bundle 272 in the width direction.
The crimping traces 281 of one crimping processing part 271 are arranged symmetrically at one place with respect to the symmetry axis 72c. However, it is not necessary to be strictly symmetrical, and it is sufficient if the center line 272c is on the crimping processing portion 271. Other parts not specifically described are configured in the same manner as in the first embodiment and function in the same manner.

  Example 3 is an example in the case of crimping and binding at two locations in the center in the width direction of the sheet bundle.

FIG. 27 is a front view of an essential part of a sheet bundle showing a state where the sheet bundle has been crimped and bound in the third embodiment.

In Example 3, the pressure-bonding processing portion 271 bonded by the pressure-bonding mark 281 shown in Example 2 is used as the sheet bundle 2.
In this example, two upper ends 272a in the longitudinal direction of 72 are provided symmetrically with respect to the center line 272c in the center in the width direction. The tooth mold 261 is the same as that shown in FIG.

In the third embodiment, the crimping processing unit 271 in the second embodiment is the first and second crimping processing units 27.
Two locations 1A and 271B are provided. Other configurations are the same as those of the second embodiment. That is, in the third embodiment, the crimping portions 271A and 271b are formed symmetrically with the central portion 272c of the upper end portion 272a as the axis of symmetry. The crimp mark 281 is similar to the crimp mark 281 shown in FIG. 23, FIG. 24 or FIG. 25 in the longitudinal direction (arrow D5 direction) at the upper end 272a of the sheet bundle 272.
And is formed vertically.

As a result, when it is turned from an oblique direction, it almost turns from the direction of the arrow D1 or the direction of the arrow D2, and as in the second embodiment, the relative relationship between the direction of contact with the crimping mark 281 or the crimping processing portion 271 is as shown in FIG. Same as FIG. In addition, if it is struck from the bottom, the crimp mark 2
The relative relationship between the direction 81 and the crimping processing unit 271 is the same as that in FIG. In the former case, the contacts C2, C2 ', C2 "or contacts C4, C4' are placed at three places (plural places) when they are hit.
, C4 ″, and in the latter case, contacts C5 are formed at 18 locations. This separates the peeling force and makes it difficult to peel off.

In the third embodiment, the crimping processing unit 271 is arranged so that the two crimping processing units 271A and 271B are symmetrical with respect to the center line 272c in the center of the sheet bundle 272 in the width direction. However, it need not be strictly symmetric. Other parts not specifically described are configured in the same manner as in the first or second embodiment and function in the same manner.

As described above, according to the present embodiment, the following effects can be obtained.
1) A branching path 241 for stacking conveyed sheets, and a binding tool 21 for binding and binding a sheet bundle 272 stacked on the branching path 241 with a tooth mold 261 having a plurality of crimping portions 270.
In the sheet processing apparatus having 0, when binding the corners of the sheet bundle 272 with the binding tool 210, the longitudinal direction of the crimp mark 281 formed on the sheet bundle 272 by the crimp portion 270 and the sheet bundle 272 Since the angle θ formed with one side of the corner portion is approximately 30 to 60 degrees,
When the sheets of the sheet bundle 272 bound by the binding tool 210 are rolled, the crimped sheet 281 formed by the binding tool 210 and the contacts C2, C2 ′, C2 ″,
C4, C4 ′, C4 ″, and C5 are bound. As a result, the peeling force is dispersed, and the peeling force applied to one crimping mark 281 is reduced. As a result, without changing the crimping binding mechanism, It is possible to realize crimp binding that is difficult to peel off when the sheet is rolled.

2) A branching path 241 that stacks the conveyed sheets, and a binding tool 21 that presses and binds the sheet bundle 272 stacked in the branching path 241 with a tooth mold 261 having a plurality of crimping portions 270.
In the sheet processing apparatus provided with 0, when the center portion of the sheet bundle 272 is bound by the binding tool 210, the crimp mark 281 formed on the sheet bundle 272 by the crimp portion 270.
Is substantially perpendicular to one side of the sheet bundle 272 on the binding side, and therefore, there are contacts at a plurality of points in a normal user's turning operation. As a result, the peeling force is dispersed in the same manner as in the case of 1), and it is possible to realize the crimp binding that is difficult to peel off when the sheet is rolled.

3) When the direction in which the sheet is wound is parallel to the longitudinal direction of the press-bonding mark 281, the sheet has all the press-bonding marks 281.
The sheet is contacted with respect to at least two (preferably three or more) crimping traces 281 when the direction in which the sheet is wound has an angle with respect to the longitudinal direction of the crimping traces 281. Therefore, it is possible to make the peeling at least twice as difficult as the conventional example.

4) Since the longitudinal dimension of the convex portion 270a of the binding tool 210 is set to a length that is sufficient to have a contact with the crimping mark 281 at a plurality of locations, the diagonal direction with respect to the longitudinal direction of the crimping mark 281 ( Even when the sheet is rolled (with an angle), the peeling force can be reliably distributed.

5) Since the interval between the adjacent convex portions 270a is set to the interval d1 that is sufficient to have contacts at the plurality of locations in association with the length between the crimping trace 281 and the sheet, the longitudinal direction of the crimping trace 281 is Even when the sheet is rolled up in an oblique direction (with an angle), the peeling force can be reliably dispersed.

6) Since the crimping portion 270 includes a plurality of tooth mold portions 261 having a plurality of linear protrusions 270a, for example, a plurality of, for example, three sets of three linear protrusions 270a, an angle is provided. Even when the sheet is rolled, it is possible to reliably have contacts at a plurality of locations.

7) The tooth mold portion 261 includes a convex portion 270a and a concave portion 270b that meshes with the convex portion 270a, and a crimping mark 280.
, 281 are formed by sandwiching and pressing the sheet bundle PB between the convex part 270a and the concave part 270b of the tooth mold part 261, so that the pressure-bonding marks 280, 28 depending on the direction of the tooth mold part 261.
One direction can be set.

In this manner, the crimping portion 27 of the binding tool 210 with respect to the sheet turning direction of the sheet bundle 272.
By setting the binding direction by 0, the substantial binding strength can be increased without increasing the crimping force (crimping mechanism, crimping torque) of the crimping binding. That is, by determining the binding direction (the direction of the crimping portion 270 of the tooth mold 261) according to the sheet turning direction of the sheet bundle, it is possible to realize crimping binding that is difficult to peel without changing the crimping binding mechanism.

8) When an image forming system including the sheet post-processing apparatus 201 and the image forming apparatus 101 is constructed, an in-body sheet discharge type crimping and binding apparatus that is difficult to peel off can be provided at low cost.

In the present embodiment, the stacking means in the claims is the branch path 241, the sheet bundle is the code SB or 272, the crimping part is the code 270, the binding means is the binding tool 210, and the sheet processing apparatus is the sheet post-processing The apparatus (finisher) 201 has crimp marks 280, 280A, 2
81,281A, 281A1,281A2,281B, 281B1,281B2, contacts are C, C1, C2, C2 ′, C2 ″, C4, C4 ′, C4 ″, and the direction in which the sheet is rolled is arrows D1, D2, D3 The longitudinal direction of the crimping trace is in the direction of arrow D5, the length of the crimping trace in the longitudinal direction is denoted by reference numeral 11, the spacing between the crimping marks is denoted by reference numeral d1, and the tooth mold part is denoted by reference numeral 261 or first to third 3 One tooth mold part 261a, 261b, 261c, the convex part is denoted by reference numeral 270a, and the concave part is 2
70b, the corner of the sheet bundle is denoted by reference numeral 272d, the diagonal line of the sheet bundle is denoted by reference numeral 272b, the upper edge of the sheet bundle is at the upper end 272a, the symmetry axis is at the center line 272c, and the image forming system includes the image forming apparatus 102 and Each corresponds to a system including the sheet post-processing apparatus 201.

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-described embodiments show preferred examples, but those skilled in the art can realize various alternatives, modifications, variations, and improvements from the contents disclosed in the present specification. These are included in the technical scope described in the appended claims.

102 Image forming apparatus 201 Sheet post-processing apparatus (finisher)
210 Binding tool 241 Branch path 261, 261a, 261b, 261c Tooth mold part 270 Crimping part 270a Convex part 270b Concave part 271, 271A, 271B Crimping part 272a Upper end part 272b Diagonal line of sheet bundle 272c Center line 272d Corner part of sheet bundle 280 , 280A, 281, 281A, 281A1, 281A2, 281B, 281B
1,281B2 Crimping marks C, C1, C2, C2 ′, C2 ″, C4, C4 ′, C4 ″ Contact points d1 Crimping trace distances D1, D2, D3 Sheet folding direction D5 Crimping trace longitudinal direction l1 Crimping trace length Length in direction PB, 272 Sheet bundle θ The angle formed by the longitudinal direction of the crimp mark and one side of the corner of the sheet bundle

JP 2004-155537 A

To solve the above problems, the present invention comprises a binding hand stage for binding a sheet bundle includes a plurality of protrusions, the binding means, depending on the plurality of convex portions, straight slanted with edges of the sheet bundle A plurality of binding portions composed of a plurality of crimp marks arranged on the top are formed at a corner portion of a sheet bundle , and a gap between the plurality of sets of binding portions is wider than an interval between the plurality of crimp marks. The plurality of sets of binding portions are arranged in a straight line . Note that problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

Claims (9)

Stacking means for stacking the conveyed sheets;
Binding means for pressing and binding the sheet bundle accumulated in the accumulation means by a plurality of pressure bonding parts;
A sheet processing apparatus comprising:
When binding the corner of the sheet bundle by the binding means, the angle formed by the longitudinal direction of the crimp mark formed on the sheet bundle by the crimping portion and one side of the corner of the sheet bundle is approximately 30 to 60 degrees. A sheet processing apparatus. Stacking means for stacking the conveyed sheets;
Binding means for pressing and binding the sheet bundle accumulated in the accumulation means by a plurality of pressure bonding parts;
A sheet processing apparatus comprising:
When binding the center portion of the sheet bundle by the binding means, the longitudinal direction of the crimp marks formed on the sheet bundle by the crimping portion is substantially perpendicular to one side of the binding side sheet bundle. apparatus. The sheet processing apparatus according to claim 1 or 2,
When the direction in which the sheet is wound is parallel to the longitudinal direction of the crimping trace, the sheet has contacts almost simultaneously with respect to the entire crimping trace,
When the direction in which the sheet is wound has an angle with respect to the longitudinal direction of the crimping trace, the sheet has a contact point with respect to at least two crimping traces. The sheet processing apparatus according to claim 3,
The sheet processing apparatus according to claim 1, wherein a dimension in a longitudinal direction of the crimping portion is set to a length sufficient to have contacts at the plurality of positions with the crimping mark. The sheet processing apparatus according to claim 3,
The sheet processing apparatus is characterized in that an interval between the adjacent crimping portions is set to an interval sufficient to have contacts at the plurality of positions between the crimping marks and the sheet. The sheet processing apparatus according to claim 3,
The sheet processing apparatus, wherein the crimping section includes a plurality of tooth mold sections having the plurality of linear protrusions. The sheet processing apparatus according to claim 6,
The tooth mold part includes a convex part and a concave part meshing with the convex part,
The sheet processing apparatus, wherein the crimp mark is formed by sandwiching and pressing the sheet bundle between the convex part and the concave part of the tooth mold part. The sheet processing apparatus according to claim 2,
The crimping part includes a plurality of tooth mold parts having the plurality of linear convex parts and concave parts meshing with the linear convex parts,
The tooth mold part is arranged at one place or a plurality of places with the central part as a symmetry axis,
The sheet processing apparatus, wherein the crimp mark is formed by sandwiching and pressing the sheet bundle between the convex part and the concave part of the tooth mold part. An image forming system comprising the sheet processing apparatus according to claim 1.