JP7150077B2 - sheet binding device - Google Patents

Description

The present invention relates to a sheet binding device for binding a plurality of sheets, and to improvement of a binding mechanism.

Generally, this type of binding device is known as a post-processing device in an image forming system as a device for binding a bundle of sheets supported on a sheet loading table (sheet supporting surface). As a binding processing mechanism, a mechanism that binds a sheet bundle with staples (staple binding mechanism) and a mechanism that presses and binds a sheet bundle with a pressure surface having an uneven surface (pressure binding mechanism) is known.

A pressure binding mechanism that binds a bundle of sheets without using a metal needle can easily separate and separate the bound sheets, and has been selected as a binding method that does not cause environmental problems when disposing of documents. On the other hand, it is also known that when the thickness of the bundle of sheets to be bound is thick, the sheets are peeled off when the pages are vigorously turned.

For example, Patent Document 1 proposes a device in which a pair of pressing members for pressing a bundle of sheets are formed with teeth of a convex shape and a concave shape, and a plurality of sheets are deformed into a corrugated plate shape in cross section and bound together. . The document discloses a pressurizing mechanism in which a plurality of teeth are arranged in a row with the face width direction directed from the center of the sheet toward the edge side.

Further, Japanese Patent Application Laid-Open No. 2002-200002 discloses a mechanism in which a plurality of tooth dies having different meshing shapes to be pressed are exchangeably arranged at a binding position to bind a sheet bundle with a meshing shape corresponding to the thickness of the bundle.

JP 2012-47940 A JP 2010-274623 A

As a method for binding a plurality of sheets without using staples, there is known a binding processing mechanism that deforms the sheets by pressing the stacked sheets from the front and back directions with a pressure surface having uneven teeth. there is In this binding processing mechanism, the bound sheet bundle may be easily peeled off, and if the pressing force is increased to obtain a strong binding, the sheets may be damaged.

Therefore, as proposed in Patent Document 2, it is proposed to prepare a plurality of tooth shapes for pressing, one for thick sheet bundles and one for thin sheet bundles, and to change the tooth shape according to the sheet bundle. . In this case, there arises a problem that the mechanism of the pressurizing portion becomes complicated and large.

When a bundle of sheets is pinched and bound by a pair of pressure surfaces in this way, the binding force and degree of breakage differ depending on the thickness of the bundle of sheets, the difference in materials, and the difference in temperature and humidity. It is said that it is difficult to set the pressure to the optimum condition for

SUMMARY OF THE INVENTION It is an object of the present invention to provide a binding device that does not easily separate sheets due to the thickness of the bundle of sheets to be bound and that is less likely to damage the sheets.

In order to solve the above-described problems, the sheet binding device of the present invention is provided with sheet receiving positions spaced apart from each other so as to receive a plurality of sheets from a predetermined carry-in direction, which are arranged facing each other, and the front and back directions of the plurality of sheets. a pair of pressurizing members movable to a binding position to pressurize and bind in a state of being sandwiched between them ; A second tooth type row consisting of a plurality of unevenness arranged in the tooth row direction and arranged adjacent to the first tooth type row in the tooth width direction, and a second tooth type row arranged on the other of the pair of pressure members , A third row of teeth formed of a plurality of aligned recesses and protrusions, meshing with the first row of teeth at the binding position and forming a first binding tooth pair together with the first row of teeth; and a fourth tooth profile row that meshes with the second tooth profile row at the binding position and forms a second binding tooth pair together with the second tooth profile row , and , wherein the first binding tooth pair is provided downstream of the second binding tooth pair, and the meshing depth of the first binding tooth pair is made deeper than the meshing depth of the second binding tooth pair. characterized by

According to the present invention, when a pair of pressing members pinches and binds a sheet bundle from the front and back directions, the pressing force applied to the thick sheet bundle is not insufficient and the thin sheet bundle is not damaged.

1 is an explanatory diagram of the overall configuration of an image forming system including a post-processing device according to the present invention; FIG. FIG. 2 is a detailed explanatory diagram of a post-processing device in the image forming system of FIG. 1; 3 is a mechanism explanatory diagram of a sheet binding device incorporated in the post-processing device of FIG. 2; FIG. It is an explanatory diagram of one embodiment (first embodiment) of the pressure surface in the binding device of FIG. 3, (a) is a perspective explanatory view of the pressure surface, (c) shows the tooth profile shape of the second tooth profile row. FIG. 4 shows the binding state of sheets in the binding device of FIG. 4, where (a) is a planar state, (b) is a tooth profile cross-sectional view of the first tooth profile row, and (c) is a tooth profile cross-sectional view of the second tooth profile row. is. It is an explanatory view of the second embodiment of the pressure surface in the binding device of FIG. and (d) shows the planar state of the pressure surface. FIG. 4 is an explanatory diagram of a third embodiment of the pressure surface in the binding device of FIG. shows the planar shape of FIG. 11 is an explanatory view showing pressure binding positions of a bundle of sheets, where (a) shows a case of binding along sheet corners and (b) shows a case of binding along sheet edges; 3 is a block diagram showing a control configuration, where (a) shows the control configuration of the image forming system, and (b) is a flow chart showing binding processing operation; FIG.

The present invention will be described in detail below based on the illustrated embodiments. FIG. 1 shows an image forming system equipped with a post-processing device according to the present invention. This system is composed of an image forming apparatus A that forms images on sheets, and a post-processing apparatus B that binds and stores the sheets on which images have been formed. The post-processing device B incorporates a sheet binding device C for binding the stacked sheets.

[Image forming system]
The image forming system shown in FIG. 1 will be described. The illustrated image forming system is composed of an image forming apparatus A and a post-processing apparatus B, and the sheet binding apparatus C is built in the post-processing apparatus. The image forming apparatus will be described below.

The image forming apparatus A is built in an apparatus housing 4 including a paper feeding section 1, an image forming section 2, a paper discharging section 3, and a signal processing section (not shown). The sheet feeding unit 1 is composed of a plurality of cassettes 5 for storing sheets, and is configured to be able to store sheets of different sizes. Each cassette 5 incorporates a sheet feeding roller 6 for feeding sheets and separating means (separating claw, separating roller, etc.; not shown) for separating sheets one by one.

Further, the sheet feeding section 1 is provided with a sheet feeding path 7 for feeding sheets from each cassette 5 to the image forming section 2 . A registration roller pair 8 is provided at the end of the paper feed path 7 to align the leading edges of the sheets sent from each cassette 5 and wait until the paper is fed according to the image forming timing of the image forming section 2 .

The image forming section 2 can employ various image forming mechanisms for forming an image on a sheet. The illustration shows an electrostatic imaging mechanism. As shown in FIG. 1, a plurality of drums 9 composed of photoreceptors (photoconductors) are arranged in the device housing 4 according to the color components. Each drum 9 is provided with a light emitter (laser head, etc.) 10 and a developer 11 . A light emitter 10 forms a latent image (electrostatic image) on each drum 9 , and a developer 11 attaches toner ink to the drum 9 . The ink images deposited on the respective drums are transferred to the transfer belt 12 for each color component and combined into an image.

The transferred image formed on the belt is image-transferred by the charger 13 onto the sheet sent from the paper supply unit 1 , fixed by the fixing device (heating roller) 14 , and then sent to the paper discharge unit 3 . The paper discharge section 3 is composed of a paper discharge port 16 for discharging a sheet to a paper discharge space 15 formed in the apparatus housing 4 and a sheet transport path 17 for guiding the sheet from the image forming section 2 to the paper discharge port. there is A duplex path 18, which will be described later, is connected to the discharge section 3, and the sheet on which an image is formed on the front side is reversed and fed to the image forming section 2 again.

An image reading unit D is composed of a platen 19a and a reading carriage 19b that reciprocates along the platen. A document feed unit E in the drawing is composed of a transport mechanism that feeds the document sheets set on the paper feed tray one by one to the platen 19a and stores them in the discharge tray 20 after the image is read.

[Post-processing device]
Next, the post-processing apparatus B shown in FIGS. 1 and 2 will be described. The illustrated post-processing device B incorporates a binding unit C (sheet binding device; hereinafter the same), and is configured as a terminal device of an image forming system.

In FIG. 2, the post-processing apparatus B includes an apparatus housing 34, a sheet conveying path 22 disposed in this housing, and a processing tray 24 (sheet supporting means; the same applies hereinafter) disposed downstream of the sheet discharge port 23 of the path. , and a stack tray 25 arranged downstream thereof.

Carrying-in means 37 for carrying sheets into the processing tray 24, and position regulating means (sheet edge regulating member 26 and side edge aligning member 27, which will be described later) for positioning the carried-in sheet at a predetermined post-processing position (stitching position) P. are placed. The processing tray 24 is provided with a sheet binding device (pressure binding means 49) for binding the sheet bundle. The configuration of this crimp binding means 49 will be described later. The illustrated processing tray 24 is provided with a pressure binding means 49 and a staple binding means 38 for binding sheets, and the sheets stacked on the tray are pressure bound or stapled by a designated means.

As shown in FIG. 2, the apparatus housing 34 is provided with a sheet conveying path 22 having an inlet 21 and an outlet 23. In the illustrated one, a sheet is received from the horizontal direction, conveyed in a substantially horizontal direction, and discharged. It is configured to be carried out from the paper slot 23 . The sheet conveying path 22 incorporates a conveying mechanism (such as conveying rollers) for conveying sheets.

The conveying mechanism is composed of a pair of conveying rollers spaced apart by a predetermined distance according to the length of the path. The carry-in roller pair 28 and the paper discharge roller pair 29 are connected to the same drive motor (not shown) and convey the sheet at the same peripheral speed. A sheet sensor Se<b>1 that detects at least one of the leading edge and the trailing edge of the sheet is arranged in the sheet conveying path 22 .

A processing tray 24 is arranged downstream of the discharge port 23 of the sheet conveying path 22 with a step d formed therebetween. The processing tray 24 is provided with a sheet loading surface 24a for supporting at least a part of the sheets in order to stack the sheets sent from the sheet discharging port 23 upwards and stack them in a bundle. The processing tray 24 stacks the sheets sent from the sheet ejection port 23 in a bundle shape, aligns them in a predetermined posture, performs binding processing, and conveys the processed sheet bundle to the stack tray 25 on the downstream side. is configured to

A sheet carrying-in means 37 (paddle rotator) is arranged at the sheet discharge port 23 and conveys the sheet to a predetermined position of the processing tray 24 . Further, the processing tray 24 is provided with a rake conveying means 39 for guiding the leading edge of the sheet to the sheet edge regulating member 26 .

The raking conveying means 39 is disposed upstream of the sheet end regulating member 26, and is composed of a ring-shaped belt member as shown. The belt member 39 engages with the uppermost sheet on the sheet mounting surface and rotates in the direction of conveying the sheet toward the sheet end regulating member (position regulating means) 26 .

A sheet end regulating member 26 for positioning a sheet is provided at the leading end of the processing tray 24 (rear end in the discharge direction in the illustrated one). Then, the sheet conveyed by the scraping conveying means 39 from the discharge port 23 is abutted and regulated. The sheet end regulating member 26 aligns the sheets stacked on the processing tray to a predetermined processing position.

Further, the processing tray 24 is provided with side edge aligning members 27 that align the width direction of the sheet positioned by the sheet edge regulating member 26 with the reference line. The illustrated side edge aligning member 27 aligns the sheet fed from the sheet discharge port 23 and positioned by the sheet edge regulating member 26 in the sheet discharge orthogonal direction. The side edge aligning member 27 is composed of a pair of left and right aligning plates, and positions the sheet on a predetermined reference line (center reference or side reference).

The processing tray 24 is provided with pressure binding means 49 and staple binding means 38 for binding the sheets that are regulated by the sheet end regulation member 26 and positioned in the width direction by the side edge alignment member 27 . Since the sheet binding processing mechanism and binding processing operation by the stapling means 38 are already well known, the description thereof will be omitted.

[Crimp binding means]
A crimp binding means (sheet binding device) 49 according to the present invention will be described with reference to FIG. The pressure binding means 49 presses and deforms a plurality of sheets stacked in a bundle to bind them together. For this reason, the pressure binding means 49 is composed of a clamping mechanism that clamps and deforms a plurality of sheets.

A pair of pressure surfaces 31 and 41 for pressing a bundle of sheets from the front and back directions, a pair of pressure members 30 and 40 having the pressure surfaces, and a standby position where one pressure surface of the pressure member is separated from the sheets. It is composed of a driving mechanism (driving means) PM that moves the sheet from a non-pressing position (the same applies hereinafter) to a pressing position where the sheet is pressed. The clamping mechanism of FIG. 3 includes a fixed-side pressure member 30 having a fixed-side pressure surface 31, a movable-side pressure member 40 having a movable-side pressure surface 41, and a standby position where the movable-side pressure surface is separated from the sheet. and a driving mechanism PM that moves to a pressurizing position for pressurizing the sheet.

The fixed side pressure member 30 (hereinafter referred to as "fixed member") and the movable side pressure member 40 (hereinafter referred to as "movable member") are connected to a pressure surface 31 (hereinafter referred to as "fixed surface") of the fixed member 30. The sheet bundle supported on the is clamped by the pressing surface 41 of the movable member 40 (hereinafter referred to as "movable surface"). For this reason, the movable member 40 is rotatably supported about a support shaft 42 , and the support shaft 42 is fixed to the fixed member 30 . The support shaft 42 may be fixed not only to the fixing member 30 but also to other members such as a unit frame.

Further, the fixed member 30 is integrally fixed to the unit frame 46 . The fixed surface 31 and the movable surface 41 move between the pressurized state (pressurized position) in which the sheet bundle is clamped and the state in which the sheet bundle is separated (separated from the sheet bundle) by an operation in which the movable member 40 swings about the support shaft 42 . ) and move between non-pressurized states (standby positions).

In the device shown in FIG. 1, a fixed member 30 is formed of a frame member (metal, reinforced resin, etc.) having a U-shaped (channel-shaped) cross section, and a movable member 40 is pivoted by a support shaft 42 between side walls 30a and 30b. movably supported. In this manner, the movable member 40 is guided by the side walls 30a and 30b of the fixed member 30 and swings about the support shaft 42. As shown in FIG. A return spring 43 that biases the movable member 40 toward the standby position is arranged. This return spring 43 is arranged between the unit frame 46 (or the fixed member 30).

Therefore, the fixed surface 31 and the movable surface 41 are formed with a pair of pressing surfaces for pressing the sheet bundle from the front and back directions. Each pressure surface 31, 41 is formed with convex and concave tooth profiles (31x, 41x) that mesh with each other with a predetermined tooth width (w) (see FIG. 4). The shape of the tooth profile will be explained in the following first to third embodiments. FIG. 4 describes features of the tooth profile common to the embodiments described later. The pair of movable surfaces 31, 41 for pinching and pressing the sheet bundle are formed with a convex tooth shape 41x on one side and a concave tooth shape 31x on the other side. there is

A plurality of tooth patterns 31x and 41x are arranged on the fixed surface 31 and the moving surface 41 so as to mesh with each other, forming tooth pattern rows Dx and Dy. Each tooth does not need to have the same shape, but for convenience of explanation, it is formed in the same shape, and is formed into a gear shape having a tooth thickness dt, a tooth width dw, and a meshing depth dh. The plurality of teeth are arranged continuously over a predetermined length (DL: pressure binding length), and the pressure binding area (Pa) for applying pressure to the sheet bundle is set to (Pa=DL×dw).

As shown in FIG. 8, the pressurized binding area Pa is arranged at the sheet corner at a predetermined angle (in the figure, an α angle from the side edge of the sheet and a β angle from the front edge of the sheet; arbitrary angles for each); It may be formed parallel to the side edge of the sheet or may be formed parallel to the leading edge of the sheet. In either case, the rows of tooth dies Dx and Dy have a plurality of tooth dies arranged in the direction of the face width direction from the center of the sheet to the edge.

Therefore, in a first embodiment to be described later, two or more rows of tooth mold rows Dx and Dy are arranged in parallel, and the meshing depth dh1 of the tooth mold row Dx located on the sheet edge side and the tooth mold row located on the seat center side The meshing depth dh2 with Dy is made different (dh1>dh2). In the second embodiment, the teeth (Dx) are formed in a single row, and each tooth (dx, dy) is formed with a step Δ to provide an engagement depth dh1 on the sheet edge side and a The meshing depths dh2 are different (dh1>dh2).

In the third embodiment, which will be described later, a row of tooth dies (Dx) is formed in a single row, and each tooth dies (dx, dy) is formed with an inclination (taper γ). In this case, the taper is formed so that the meshing depth on the sheet edge side is deeper than the meshing depth on the sheet center side.

A drive mechanism for the movable member 40 will be described. A movable member 40 swingably supported by the fixed member 30 has a movable surface 41 at its distal end with a support shaft 42 as a boundary, and a cam follower 44 (hereinafter referred to as "follower roller") at its proximal end. The movable surface 41 at the tip and the follower roller 44 are formed to have a lever length that acts as a lever (power boosting mechanism) through the support shaft 42 .

A cam member 33 (the illustrated one is a cylindrical cam) is arranged at the proximal end portion of the fixed member 30 . The cam member 33 is supported by the cam shaft 32, the cam shaft 32 is rotatably supported by the fixed member 30, and the cam member 33 and the follower roller 44 are arranged in a positional relationship in which they engage with each other. Rotation of a drive motor DC is transmitted to the cam shaft 32 via a transmission means 35, and the cam member 33 is connected so that the cam member 33 rotates forward and backward when the drive motor rotates forward and backward.

As shown in FIG. 3, the drive motor DC is mounted on the unit frame 46, and the rotation of the drive shaft 36 is transmitted to the cam shaft 32 by transmission gears G2, G3, G4, and G5 constituting the transmission means 35. . The gear G1 connected to the cam shaft 32 rotates the cam member 33 counterclockwise in FIG. In the illustrated one, the driving motor DC rotates forward and backward, and the cam member 33 is configured to repeat counterclockwise rotation (CCW) and clockwise rotation (CW) within a predetermined angle range. The cam surface 33a of the cam member 33 swings the follower roller 44 and the movable member 40 integrated therewith around the support shaft 42. As shown in FIG.

The pair of pressurizing surfaces 31 and 41 are supported by pressurizing members (fixed pressurizing member 30 and movable pressurizing member 40) and move from a standby position Wp separated from each other to an operating position Ap. At this time, the sheet bundle is pressurized by the pair of pressing surfaces 31 and 41, and the sheets are mutually deformed, and at the same time, they are crimped and bundled. The mutual binding of the sheets is due to the mutual entanglement of the fiber components of the sheets and the plastic deformation of the uneven shape in the overlapping state.

Therefore, the larger (deeper) the meshing depth (dt) between the pressure surface 31 (fixed surface) and the pressure surface 41 (movable surface), the greater the binding force. On the other hand, the greater the meshing depth, the greater the deformation force exerted on the seat, and the more easily the seat is damaged. In an embodiment to be described later, the engagement depth (dh2) on the sheet center side is set shallow, and the engagement depth (dh1) on the sheet edge side is set deep, so that thin to thick sheet bundles can be reliably bound. and the level of breakage that occurs in soft sheets is less impacted because it occurs closer to the sheet edge.

[First Embodiment of Pressure Surface]
The pressure surfaces 31 and 41 shown in FIG. 4 form first and second tooth profile rows (Dx, Dy) at the sheet corners, with the first tooth profile row Dx positioned on the edge side of the sheet and the row of teeth positioned on the center side of the sheet. The second tooth mold rows Dy are arranged, for example, substantially parallel or in directions that do not intersect each other. The tooth width dw direction of each tooth type (upper tooth type 31x and lower tooth type 41x) is arranged in a straight line direction (the arrow direction in FIG. 4) extending from the center of the sheet to the edge side.

The meshing depth (dh1) of the first tooth type row Dx positioned on the sheet edge side and the meshing depth (dh2) of the second tooth type row Dy positioned on the seat center side are made different. At this time, the meshing depth dh1 of the first tooth type row Dx is set deep, and the meshing depth dh2 of the second tooth mold row Dy is set shallow (dh1>dh2).

The meshing depth dh1 is set to a shape and a depth dimension for reliably binding even when the sheet bundle is thick and hard to deform (strong). Also, the meshing depth dh2 is set to a depth dimension that prevents the sheets from being damaged even when the sheet bundle is made of a thin and soft sheet material.

By setting the meshing depth of the tooth profile in this way, it is possible to reliably bind the sheets and reduce the influence of damage even with a relatively wide range of sheet materials and sheet bundle thicknesses.

In addition, the illustrated first tooth type row Dx and second tooth type row Dy have a pressure binding length (DL), a short first tooth type row length DL1, and a second tooth type row length DL2. is set long (DL1<DL2). In other words, the pressure length is set short for tooth type rows that have a strong pressure force and tend to damage the sheet, and the pressure length is set long for tooth shape rows that have a low pressure force and are unlikely to damage the sheet. . Each length is set according to the degree of damage to the sheet and the degree of binding strength through experiments.

[Second Embodiment of Pressure Surface]
The pressurizing surface shown in FIG. 6 has teeth (31x, 41x) that mesh with each other in a row (Dx). The tooth width (dw) of each tooth type is set in the direction from the sheet center to the sheet edge, and the pressure binding length (DL1) is set to an appropriate length dimension. A step Δ is formed in each of the teeth (31x, 41x) to make the engagement depth dh1 on the edge side of the seat and the engagement depth dh2 on the center side of the seat different.

The meshing depth is such that the depth of meshing (dh1) on the edge side of the seat is deep and the depth of meshing (dh2) on the center side of the seat is shallow (dh1>dh2). have set. In this case, FIG. 4(b) shows the case where a step (Δ) is formed on each of the pressing surfaces 31 and 41 facing each other, and FIG. is shown.

[Third Embodiment of Pressure Surface]
The pressurizing surface shown in FIG. 7 is formed by a row of teeth (31x, 41x) that mesh with each other in a row (Dx). The tooth width (dw) of each tooth type is set in the direction from the sheet center to the sheet edge, and the pressure binding length (DL1) is set to an appropriate length dimension. Each tooth type (31x, 41x) is formed with a taper (.gamma. angle) to make the engagement depth dh1 on the edge side of the seat and the engagement depth dh2 on the center side of the seat different. In this case, the taper (γ) is formed so that the engagement depth (dh1) on the sheet edge side is deeper than the engagement depth (dh2) on the sheet center side (dh1>dh2).

In this case, FIG. 10(b) shows the case where the pressing surfaces 31 and 41 facing each other are tapered (γ angle), and FIG. indicates when

[Control configuration]
Next, a control configuration shown in FIG. 9 will be invented. This figure shows the control configuration of the image forming apparatus system. The control means 50 is composed of an image formation control section 45 for controlling the image forming unit and a post-processing control section 50 . The image formation control section 45 is composed of a mode selection means 48 and an input means 47 . The input means 47 sets the image forming conditions and at the same time sets the binding processing mode. For the binding processing mode, it is selected whether the binding processing is executed by the first binding means (staple binding means) 38 or by the second binding means (pressure binding processing means) 49 .

The post-processing control unit 50 is composed of a post-processing control CPU, and calls an execution program stored in the ROM 53 to execute post-processing operations. The RAM 54 also stores control data such as the pressure time Tp for the binding operation by the second binding means 49 described above.

The control CPU 50 is composed of a stacking control section 50a, a binding processing control section 50b, and a stack control section 50c. The stacking control unit 50a stacks the sheets sent from the image forming apparatus A on the processing tray 24 in a sorted manner. The binding process control unit 50b controls the stapler binding means 38 to perform a binding operation when the first binding process mode is selected. Also, when the second binding processing mode is selected, the pressure binding means 49 is controlled to perform the binding operation. For this reason, the binding process control section 50b is connected to the driver 51 of the driving motor DC of the pressure binding unit 49 so as to transmit command signals.

The sheet bundle binding processing operation by the control CPU 50 will be described. As shown in FIG. 9B, when the device power is turned on (St01), an initialization operation is executed (St02). Then, the operator sets the folding processing mode at the same time as designing the image forming conditions (St03). Next, the control means 50 discharges the sheet to a post-processing device that forms an image on the sheet (St04). In the post-processing apparatus B, the sheets sent from the image forming apparatus A are conveyed onto the processing tray and accumulated in a bundle (St05).

When the aligning unit receives the job end signal (St06) from the image forming apparatus A, it performs the binding processing operation (St07). After the binding process, the sheet bundle is stored in the stack tray 25 (St08).

A Image forming apparatus B Post-processing apparatus C Sheet binding device 22 Sheet conveying path 24 Processing tray 25 Stack tray 30 Fixed side pressure member (fixed member)
31 fixed side pressure surface (fixed surface)
40 movable side pressure member (movable member)
41 pressure surface on movable side (movable surface)
49 Crimp binding means Dx First tooth type row Dy Second tooth type row

Claims (2)

They are arranged facing each other and are movable between a sheet receiving position separated from each other so as to receive a plurality of sheets from a predetermined carry-in direction, and a binding position where the plurality of sheets are sandwiched from the front and back directions and pressed and bound. a pair of pressurizing members;
A first tooth type row consisting of a plurality of unevenness arranged in the tooth alignment direction and a plurality of unevenness arranged in the tooth alignment direction arranged in one of the pair of pressure members , and the first tooth type row in the face width direction a second row of tooth molds arranged adjacent to each other;
Arranged on the other of the pair of pressurizing members, it is composed of a plurality of recesses and projections arranged in a row of teeth, and meshes with the first row of teeth at the binding position to form a first pair of binding teeth together with the first row of teeth. and a plurality of concavities and convexities arranged in the tooth alignment direction, meshing with the second tooth mold row at the binding position, and forming a second binding tooth pair together with the second tooth mold row. comprising a column and
The first pair of binding teeth is provided downstream of the second pair of binding teeth in the carry-in direction of the plurality of sheets, and the meshing depth of the first pair of binding teeth is adjusted to the meshing depth of the second pair of binding teeth. A sheet binding device characterized in that the sheet binding is made deeper than the slanting depth. 2. A sheet binding device according to claim 1, wherein said second tooth mold row and said fourth tooth mold row are longer than said first tooth mold row and said third tooth mold row in said tooth alignment direction .

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