JP5366582B2 - Sheet binding apparatus and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve binding processing corresponding to a thickness of a sheet bundle with a simple constitution. <P>SOLUTION: This sheet binding device 100 binds the sheet bundle by forming a recess-projection in the thickness direction in the sheet bundle S composed of a plurality of sheets, and includes a pair of tooth-shaped members 1 and 2 movably arranged in the thickness direction of the sheet bundle S and forming the recess-projection in the thickness direction in the sheet bundle S by sandwiching the sheet bundle S. When forming the recess-projection, an interval H in the thickness direction of the sheet bundle of the pair of tooth-shaped members 1 and 2 is widened when the thickness is thick, and is narrowed when the thickness is thin, in response to the thickness of the binding sheet bundle S. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a sheet binding device that binds a sheet bundle composed of a plurality of sheets, and an image forming apparatus having the sheet binding device.

  2. Description of the Related Art Conventionally, as a sheet binding device that binds sheets on which images are formed by an image forming apparatus such as a copying machine or a printer, a stapling device that binds a bundle of sheets using a binding member such as a metal needle is widely used. It is used.

  However, when using each sheet of the staple-bound sheet bundle as a reading document for copying, the needle binding the sheet bundle must be removed. Also, when recycling a bundle of sheets bound by a needle, it is necessary to remove the needle binding the bundle of sheets and separate and collect the sheet and the needle from the viewpoint of environmental problems. In either case, laborious work is required. Also, since the needle is discarded after use, it has been a waste of resources.

  Therefore, as a sheet binding device that reduces the time and effort of reusing and recycling documents without using needles and reducing wasteful use of resources, unevenness is formed in a part of the sheet bundle that is brought into the binding position. There has been proposed one provided with sheet binding means having convex and concave portions.

JP 2004-155537 A

  However, in the above-described sheet binding apparatus, the force applied to the sheet binding means when forming irregularities on the sheet bundle is constant. Therefore, when the setting of the force is based on the case where the number of sheets forming the sheet bundle is small, the binding force for binding the sheet bundle is insufficient when the number of sheets is large. On the other hand, when the number of sheets forming a sheet bundle is large, when the number of sheets is small, an excessive concentrated load is applied to the sheet bundle, tearing occurs at the bound portion, and friction between the sheets occurs. The power is reduced and the binding power is reduced.

  Therefore, Patent Document 1 discloses a sheet binding unit that executes the binding process by changing the number and arrangement of the irregularities formed on the sheet bundle according to the number, type, and thickness of the sheets forming the sheet bundle. ing.

  However, in Patent Document 1, in order to change the number and arrangement of irregularities formed on a sheet bundle, a plurality of sheet binding means having different numbers and arrangements of irregularities are provided interchangeably, or the sheet binding means and the sheet bundle are relative to each other. A moving mechanism for moving the position is required. That is, there is a problem that the configuration becomes complicated.

  Therefore, an object of the present invention is to realize a binding process according to the thickness of a sheet bundle with a simple configuration.

The present invention provides a sheet binding device that binds a sheet bundle by forming irregularities in the thickness direction on a sheet bundle composed of a plurality of sheets, and is provided so as to be movable in the thickness direction of the sheet bundle and separated from the sheet bundle a pair of tooth die member forming the thickness direction of the unevenness in the sheet bundle by moving to the first position for clamping the sheet bundle from the second position, the pair of toothed mold member in said first position and adjusting means for adjusting the thickness direction of the spacing of the sheet bundle, a moving means for moving the pair of tooth die member and said second position and said first position, controls said moving means and said adjusting means and control means for, have a, the control unit, and controls said adjusting means on the basis of the sheet information relating to the thickness of the sheet bundle to be bound.

According to the present invention, the distance between a pair of toothed mold members during roughening, was adjusted to a distance corresponding to the thickness of the sheet bundle to be bound by good binding processing can be realized. Further, since the pair of tooth-shaped members correspond to the thickness of the sheet bundle, the binding process corresponding to the thickness of the sheet bundle can be realized with a simple configuration.

Schematic cross section of sheet binding device Perspective view of main parts in sheet binding apparatus Schematic cross-sectional view of a state in which the sheet binding device is binding (A) is a block diagram explaining a binding process control system, (b) is a flowchart explaining binding process control. (A) is a perspective view showing a state in which a sheet bundle is installed in the sheet binding device, (b) is a partially enlarged view of a state in which the sheet bundle is being bound. (A) is a sectional view showing a state in which a sheet bundle made up of two sheets is bound, (b) is a sectional view showing a state in which a sheet bundle made up of four sheets is bound, (c) is (a) ) Is an enlarged cross-sectional view of the AA cross section of the sheet bundle binding processing portion, and (d) is an enlarged cross sectional view of the BB cross section of the sheet bundle binding processing portion of (b). Schematic sectional view of an image forming apparatus having a sheet binding device

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in the following embodiments should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions. Therefore, unless specifically stated otherwise, the scope of the present invention is not intended to be limited thereto.

  Here, the embodiment will be described by exemplifying an image forming apparatus having a sheet binding device. In the following description, first, an image forming apparatus provided with a sheet binding apparatus will be described, and then the sheet binding apparatus will be described.

  First, an image forming apparatus having a sheet binding apparatus will be described with reference to FIG. FIG. 7 is a schematic sectional view of the image forming apparatus.

  As illustrated in FIG. 7, the image forming apparatus 101 includes an image reading unit 170 and an image forming unit 115. A document table 102 made of a transparent glass plate fixedly provided is provided above the image reading unit 170. A document D placed with its image surface facing downward at a predetermined position on the document table 102 is pressed and fixed by a document pressing plate 103. An optical system including a lamp 104 that illuminates the document D and reflecting mirrors 105, 106, and 107 for guiding a light image of the illuminated document D to the image processing unit 108 is provided below the document table 102. . The lamp 104 and the reflecting mirrors 105, 106, and 107 move at a predetermined speed to scan the document D.

  The image forming unit 115 includes a photosensitive drum 28, a primary charging roller 161, a rotary developing unit 151, an intermediate transfer belt 152, a transfer roller 150, a cleaner 126, and the like. The photosensitive drum 28 is irradiated with a light image from the laser unit 109 based on the image data, and an electrostatic latent image is formed on the surface thereof. The primary charging roller 161 uniformly charges the surface of the photosensitive drum 28 before laser beam irradiation. The rotary developing unit 151 attaches magenta (M), cyan (C), yellow (Y), and black (K) toners to the electrostatic latent image formed on the surface of the photosensitive drum 28, and converts the toner image into a toner image. Form. The toner image developed on the surface of the photosensitive drum 28 is transferred to the intermediate transfer belt 152, and the toner image on the intermediate transfer belt 152 is transferred to the sheet S by the transfer roller 150. The cleaner 126 removes the toner remaining on the photosensitive drum 28 after transferring the toner image.

  Here, the rotary developing unit 151 will be described. The rotary developing unit 151 uses a rotary developing system, and includes a developing device 151K, a developing device 151Y, a developing device 151M, and a developing device 151C, and can be rotated by a motor (not shown). When a monochrome toner image is formed on the photosensitive drum 28, development is performed by rotating the developing device 151K to a developing position close to the photosensitive drum 28. Similarly, when forming a full-color toner image, the rotary developing unit 151 is rotated so that each developing device is arranged at the developing position, and development is performed in order for each color.

  The toner image developed on the photosensitive drum 28 by the rotary developing unit 151 is transferred to the intermediate transfer belt 152. The toner image on the intermediate transfer belt 152 is transferred to the sheet S by the transfer roller 150. The sheet S is supplied from the sheet cassette 127.

  A fixing device 122 is provided on the downstream side of the image forming unit 115 and fixes the toner image on the conveyed sheet S as a permanent image. The sheet S on which the toner image is fixed by the fixing device 122 is selectively subjected to a binding process by a sheet binding device 100 described later. Then, the sheet or sheet bundle is discharged to the discharge unit 125 outside the apparatus by the discharge roller pair 210.

  Next, the sheet binding apparatus will be described with reference to FIGS. First, a schematic configuration of the sheet binding device will be described with reference to FIGS. 1, 2, and 3. 1 and 3 are schematic sectional views of the sheet binding apparatus. 2A is a perspective view of the periphery of the support portion of the tooth-shaped member in FIG. 1, and FIG. 2B is an upper perspective view of the state in which the upper support base 10 is removed in FIG. 2A.

  As illustrated in FIG. 1, the sheet binding device 100 is a sheet binding device that binds a sheet bundle including a plurality of sheets without using a binding member such as a needle. The sheet binding apparatus 100 includes a pair of tooth-shaped members 1 and 2 that bind a sheet bundle. The pair of tooth-shaped members 1 and 2 are provided so as to be movable in the thickness direction of the sheet bundle, and the sheets are joined together by sandwiching the sheet bundle and forming irregularities in the thickness direction on the sheet bundle. Bind a bundle.

  A lower tooth mold member (hereinafter referred to as a lower tooth mold member) 1 is supported on a lower support base (hereinafter referred to as a lower support base) 9 with screws or the like. Similarly, the upper tooth mold member (hereinafter referred to as an upper tooth mold member) 2 is supported by an upper support base (hereinafter referred to as an upper support base) 10 with screws or the like. Each of the tooth-shaped members 1 and 2 has uneven teeth for forming unevenness in the thickness direction on the sheet bundle, and the arrangement pitch of the uneven teeth is the same.

  As shown in FIG. 2 (b), the lower support base 9 supporting the lower tooth member 1 has two positions for abutting and positioning the corners of the sheet bundle between the tooth member 1, 2. Guide pins 11 are provided. On the other hand, as shown in FIG. 2 (a), the upper support base 10 supporting the upper tooth member 2 is a circle guided by being movably engaged with the guide pins 11 of the lower support base 9. A hole 10A and an oblong hole 10B are provided. The guide pin 11 includes a guide portion 11B that guides the upper support base 10 so as to be movable in the thickness direction of the sheet bundle, and a stopper portion 11A that prevents the upper support base 10 from coming out of the guide pin 11. Further, as shown in FIG. 2, the upper support 10 is urged upward by a compression spring 21 provided on the lower support 9. The top dead center of the upper support 10 that is biased in the upward direction is determined when the upper support 10 comes into contact with the stopper portion 11A of the guide pin 11 that is larger than the diameter of the holes 10A and 10B. On the other hand, the bottom dead center of the upper support base 10 is determined when the lower surface of the upper support base 10 is in contact with the tops of the plurality of (here, three) height adjustment screws 3 provided on the lower support base 9. . The height adjusting screw 3 is an adjusting unit that adjusts the distance in the thickness direction of the sheet bundle between the tooth-shaped members 1 and 2 when the unevenness is formed on the sheet bundle. The height adjusting screw 3 is provided with a thread on the middle abdomen so as to be movable up and down with respect to the lower support base 9. A drive gear 4 that rotates integrally with the height adjustment screw 3 is provided below the height adjustment screw 3. The drive gear 4 is rotated by transmitting a worm gear (motor gear) 7 and a worm wheel gear 5 using a motor 8 as a drive source.

  As shown in FIG. 1, the pair of tooth mold members 1 and 2 includes a fixed tooth mold member fixed at a predetermined position and movable teeth movable in the thickness direction of the sheet bundle with respect to the fixed tooth mold member. It consists of a mold member. Here, of the pair of tooth mold members 1 and 2, the lower tooth mold member 1 is a fixed tooth mold member in which the lower support base 9 is attached to the frame 14 and fixed at a predetermined position. On the other hand, in the upper tooth mold member 2, the upper support base 10 is movable in the sheet bundle thickness direction along the guide pins 11, and moves in the sheet bundle thickness direction with respect to the lower tooth mold member 1. It is a possible moving tooth type member. One end of a moving arm 12 supported so as to be rotatable about a shaft 12A is in contact with the upper surface of the upper support 10 supporting the upper tooth member 2. The movable arm 12 moves along the guide pin 11 with the upper support 10 in the retracted position in a state where the distance H between the tooth mold members 1 and 2 is opened by the maximum distance by the action of the compression spring 21 and the guide pin 11. The moving means moves to the binding position that contacts the height adjusting screw 3. Here, the binding position is a first position where the sheet bundle is nipped and bound by the pair of tooth-shaped members 1 and 2, and the retracted position is the upper tooth member 2 relative to the lower tooth member 1. This is the second position retracted from the position 1 in the thickness direction of the sheet bundle.

  As described above, the upper support 10 and the moving arm 12 are usually installed in a state where the distance H between the pair of tooth-shaped members 1 and 2 is opened by the maximum distance by the action of the compression spring 21 and the guide pin 11. ing. At the other end of the moving arm 12, a pressure pin 12B is provided for pressing the connection arm 13 supported so as to be rotatable about a shaft 13A with respect to the frame 14. An arm plate 15, which is an elastic member, is attached to the upper part of the connecting arm 13. A cam 16 is in contact with the upper surface of the end portion on the free end side of the arm plate 15. The position of the arm plate 15 in the vertical direction is determined by the phase of the cam 16. The cam 16 is rotated by the drive transmitted through the motor gear 19, the drive transmission gear 18, and the cam drive shaft 17 using the cam drive motor 20 as a drive source. Therefore, when the cam 16 is rotated, the connecting arm 13 and the moving arm 12 to which the arm plate 15 is attached rotate, and the upper tooth member 2 is moved with respect to the lower support base 9 having the lower tooth member 1. The upper support 10 having the same moves along the guide pins 11 in the thickness direction of the sheet bundle. That is, when the cam 16 is rotated from the state shown in FIG. 1 to the state shown in FIG. 3, the moving arm 12 is rotated against the force of the compression spring 21, and the upper support 10 having the upper tooth member 2. Is moved to the binding position where it hits the top of the head of the height adjustment screw 3. Further, when the cam 16 is rotated from the state shown in FIG. 3 to the state shown in FIG. 1, the upper support base 10 having the upper tooth member 2 is applied to the stopper portion 11 </ b> A of the guide pin 11 by the urging force of the compression spring 21. It is moved to the retreat position where it hits. Thus, the binding process by the pair of tooth-shaped members 1 and 2 is performed by one rotation of the cam 16.

  The arm plate 15 is set under the following conditions. No matter how many sheets are stacked between the upper and lower tooth-shaped members in the retracted position up to the upper limit of the number of sheets that can be bound, the lower surface 10C of the upper support base 10 is sure to hit the top of the head of the height adjustment screw 3. is there. In addition, the interval between the upper and lower tooth-shaped members at the binding position changes every time the number of sheets to be bound changes, so that the positions of the shaft 12A of the movable arm 12, the shaft 13A of the connecting arm 13, and the cam 16 need not be changed. The upper support base 10 can be reliably brought into contact with the top of the adjustment screw 3.

  Next, the operation when a sheet bundle composed of a plurality of sheets is bound will be described with reference to FIGS. Here, an operation when a sheet bundle composed of two sheets is bound will be described as an example.

  4A is a block diagram illustrating a binding process control system, and FIG. 4B is a flowchart illustrating binding process control. FIG. 5A is a perspective view showing a state in which components other than the upper tooth type member are removed from the components positioned above the sheet bundle in the sheet binding device, and FIG. 5B is a view taken along line AA shown in FIG. It is sectional drawing, and is the elements on larger scale in the state where the sheet bundle is bound to the upper and lower tooth type members.

  The binding processing control system will be briefly described with reference to the block diagram of FIG. The CPU 51 serving as a control unit is configured to control the motor 8 that moves the height adjustment screw 3 via the motor controller 53 in accordance with information from a sheet information input unit (an operation unit or a sheet bundle thickness detection device described later) 52. Control the drive. Similarly, the CPU 51 controls driving of the cam drive motor 20 that moves the upper tooth member 2 via the motor controller 54 in accordance with the information.

  The binding process control will be described with reference to the flowchart of FIG.

  In step S1, as shown in FIG. 5A, the sheet bundle S is fed between the upper and lower tooth mold members 1 and 2 by sheet conveying means (not shown), and the corner portion of the sheet bundle S is guided by the guide portion of the guide pin 11. It is installed in a state of being abutted against 11B (binding processing position).

  In step S2, the operator inputs the number of sheets of the sheet bundle S to be bound and the thickness of each sheet from an operation unit (not shown). When the sheet binding apparatus is mounted on the image forming apparatus, this input information is input to the image forming apparatus as the number of sheets and the sheet type. Accordingly, with respect to the sheet thickness, if thickness data for the sheet type is prepared in advance, the sheet thickness is automatically determined by inputting the sheet type. In addition, a sheet bundle thickness detection device may be provided in the sheet binding device to detect the thickness of the sheet bundle to be bound and use the information. In this case, the sheet bundle is first aligned. Next, the sheet bundle is sandwiched with a force of about several hundred gf (980 mN) to 1 kgf (9.8 N) in the vertical direction (thickness direction of the sheet bundle) using a lever or the like, and the sheets are securely adhered to each other. By measuring the thickness of the sheet bundle using a line type sensor or the like in this state, highly accurate thickness information can be obtained.

  In step S3, an interval H between the upper and lower tooth mold members 1 and 2 shown in FIG. 5B is calculated from the information input in step S2. For example, if the thickness per sheet is t and the number of stacked sheets is N, the interval H is H = t × N.

  In step S4, the value (interval H) calculated in step S3 is compared with a preset interval. Here, the interval set in advance is set as a limit value Hmax at which the sheet bundle can be bound. Therefore, if H> Hmax, the process proceeds to step S7, and the sheet bundle is discharged out of the apparatus without being bound. On the other hand, if H ≦ Hmax, the process proceeds to step S5 and proceeds to the binding process.

  In step S5, the motor 8 for adjusting the adjusting screw 3 is driven by a necessary number of rotations so that the distance between the pair of tooth-shaped members 1 and 2 at the binding position is the calculated distance H. That is, the distance between the pair of tooth-shaped members 1 and 2 at the binding position is increased when the thickness is thick, and narrowed when the thickness is thin, according to the thickness of the sheet bundle S to be bound. For example, a control method in the case of binding a sheet bundle having a sheet thickness of 0.1 mm and a sheet number of 2 will be described. Here, the adjusting screw 3 has a nominal diameter M3 and is movable with respect to the lower support base 9, and the pitch of one rotation is 0.5 mm. The reduction ratio of the rotation speed of the adjusting screw 3 with respect to the motor 8 is set to 10. Under the above conditions, the adjusting screw 3 is rotated 2/5 from the state where the distance between the upper and lower tooth mold members is 0 so that the distance H between the upper and lower tooth mold members shown in FIG. The motor 8 is rotated four times so as to rotate (144 °). If the motor gear 7 is a worm gear and the reduction ratio is increased, the interval H can be realized with high accuracy. In this way, the interval between the pair of tooth-shaped members 1 and 2 at the binding position is set to an interval according to the thickness of the sheet bundle to be bound.

  In step S6, the cam drive motor 20 is driven to rotate the cam 16 once, and the sheet bundle is bound by the pair of tooth-shaped members 1 and 2. Here, the force with which the movable arm 12 pressurizes the upper support 10 having the upper tooth member 2 downward depends on the shape of the tooth shape, but it needs about 100 kgf (980 N) to 200 kgf (1960 N). Therefore, it is preferable to set the reduction ratio so that the rotational speed of the cam is sufficiently reduced from the rotational speed of the motor.

  In step S7, the sheet bundle S is discharged out of the apparatus by a sheet conveying means (not shown).

  In the sheet bundle that has been bound as described above, the two sheets are entangled with the fibers on the surfaces that are in contact with each other at an oblique angle, the sheet inside the bent portion is outward, and the outer sheet is inward. The force that tries to become flat can be combined to generate a binding force.

  FIG. 6 is a cross-sectional view showing a state in which a sheet bundle is bound, FIG. 6 (a) shows a state in which a sheet bundle composed of two sheets is bound, and FIG. 6 (b) shows a state in which four sheets are bound. A state in which the sheet bundle is bound is shown. FIG. 6C is an AA cross section of FIG. 6A, and is an enlarged view of a sheet bundle binding processing portion. Similarly, FIG. 6D is a cross-sectional view taken along the line BB in FIG. 6B, and is an enlarged view of a sheet bundle binding processing portion.

  Comparing when two sheets are bound and when four sheets are bound, the moving arm 12 rotates clockwise about the shaft 12A when the four sheets are bound by the increase in the thickness of the sheet bundle. The amount by which the cam 16 presses the arm plate 15 downward is the same for both the two-sheet binding and the four-sheet binding. On the other hand, since the movement of the upper support base 10 having the upper tooth member 2 is stopped when the lower surface of the upper support base 10 abuts against the top of the height adjustment screw 3, the moving arm 12 presses the upper support base 10 downward. The amount to be changed depends on the thickness of the sheet bundle. In contrast to the amount that the movable arm 12 presses the upper support 10 downward, the arm plate 15 is made of an elastic member such as a leaf spring so that the difference can be absorbed by its own elasticity. ing.

  As described above, the thickness H of the sheet bundle S is simply increased when the thickness of the sheet bundle S is large and narrowed when the sheet bundle S is thin, when the unevenness is formed (that is, at the binding position). Good binding processing according to the length can be realized. Further, since the pair of tooth-shaped members 1 and 2 correspond to the thickness of the sheet bundle S, the binding process corresponding to the thickness of the sheet bundle S can be realized with a simple configuration.

  In the embodiment described above, the upper support base 10 is abutted against the adjustment screw 3 provided on the lower support base 9 to adjust the distance H between the upper and lower tooth mold members 1 and 2. The adjusting means for adjusting the distance H between 1 and 2 is not limited to this. For example, the interval H may be adjusted by controlling the pressing amount of the moving arm 12 by changing the shape and phase of the cam 16 that contacts the arm plate 15 without the adjustment screw.

  In the above-described embodiment, the configuration in which the tooth-shaped member is attached to the support base with screws or the like is illustrated, but the present invention is not limited to this. It is good also as a tooth type member with which a support stand and a tooth type member were united.

  Moreover, in the form mentioned above, although the lower tooth type member was made into the fixed tooth type member and the upper tooth type member was made into the movement tooth type member among a pair of tooth type members, it was not limited to this. . The upper tooth member may be a fixed tooth member, and the lower tooth member may be a moving tooth member. Furthermore, it is also possible to adopt a configuration in which one of the pair of tooth-shaped members is fixed and the other is not moved, and both are movable tooth-shaped members. Also in that case, the same effect is acquired by making the space | interval between a pair of tooth-type members in the 1st position used as a binding position into the space | interval according to the thickness of a sheet | seat bundle.

  In the above-described embodiment, the copying machine is exemplified as the image forming apparatus, but the present invention is not limited to this. For example, the image forming apparatus may be another image forming apparatus such as a printer or a facsimile machine, or another image forming apparatus such as a multi-function machine combining these functions. The same effect can be obtained by applying the present invention to a sheet binding device used in these image forming apparatuses.

  Further, in the above-described embodiment, the configuration in which the image forming apparatus integrally includes the sheet binding apparatus is illustrated, but the present invention is not limited thereto, and may be a sheet binding apparatus that can be attached to and detached from the image forming apparatus. . The same effect can be obtained by applying the present invention to this sheet binding apparatus. In addition, the operation unit included in the image forming apparatus is illustrated as a unit for inputting sheet information. However, when the sheet binding apparatus is a separate unit, the operation unit included in the sheet binding apparatus may be used. Alternatively, the sheet information may be input from an external device such as a host computer connected to the image forming apparatus.

H ... Interval S ... Sheet bundle 1 ... Lower tooth type member 2 ... Upper tooth type member 3 ... Height adjustment screw 8 ... Motor 9 ... Lower support base 10 ... Upper support base 11 ... Guide pin 12 ... Moving arm 13 ... Connecting arm DESCRIPTION OF SYMBOLS 14 ... Frame 15 ... Arm board 16 ... Cam 20 ... Cam drive motor 21 ... Compression spring 100 ... Sheet binding apparatus 101 ... Image forming apparatus

Claims (9)

In the sheet binding apparatus that binds the sheet bundle by forming unevenness in the thickness direction on the sheet bundle composed of a plurality of sheets,
A pair of sheets provided so as to be movable in the thickness direction of the sheet bundle, and forming unevenness in the thickness direction in the sheet bundle by moving from a second position separated from the sheet bundle to a first position that sandwiches the sheet bundle. A tooth-shaped member;
Adjusting means for adjusting an interval in the thickness direction of the sheet bundle of the pair of tooth-shaped members at the first position;
A moving means for moving the pair of tooth die member and said second position and said first position,
Control means for controlling the adjusting means and the moving means;
I have a,
The sheet binding apparatus, wherein the control unit controls the adjustment unit based on sheet information relating to a thickness of a sheet bundle to be bound. The adjustment means is provided on one of the pair of tooth mold members, and abuts against the other tooth mold member at the first position, thereby increasing the distance between the pair of tooth mold members at the first position. The sheet binding device according to claim 1, further comprising an abutting member to be adjusted. The adjusting means increases the distance between the pair of tooth-shaped members at the first position when the thickness of the sheet bundle to be bound is thick and narrows when the thickness of the sheet bundle to be bound is thin . The sheet binding device according to claim 2 , wherein the contact position of the contact member with the other tooth-shaped member at the position of 1 is adjusted. The pair of tooth-shaped members includes a fixed tooth-shaped member fixed at a predetermined position and a movable tooth-shaped member movable in the thickness direction of the sheet bundle with respect to the fixed tooth-shaped member. The sheet binding apparatus according to any one of claims 1 to 3, wherein the mold member is moved in the thickness direction of the sheet bundle by the moving means. The pair of tooth-shaped members are provided such that at least one tooth-shaped member is movable in the thickness direction of the sheet bundle, and the sheet bundle is sandwiched between the other tooth-shaped members and the thickness direction of the sheet bundle. The sheet binding apparatus according to any one of claims 1 to 3, wherein the unevenness is formed. Each tooth mold member has teeth concavo-convex shape to form the thickness direction of the unevenness in the sheet bundle, any of claims 1 to 5 together arrangement pitch of irregularities, characterized in that the same The sheet binding apparatus according to claim 1. Sheet information on thickness of the sheet bundle to be the binding, the sheet binding device according to any one of claims 1 to 5, characterized in that the thickness and number of sheets forming the sheet bundle to be bound. Wherein an image forming unit for forming an image on a sheet, the sheet stapling device according to any one of claims 1 to 7 binding the sheet bundle composed of a plurality of sheets on which an image is formed, further comprising a An image forming apparatus. The image forming apparatus according to claim 8, further comprising an input unit configured to input sheet information related to a thickness of the sheet bundle to be bound.

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