JP6233679B2 - Sheet binding apparatus, sheet processing apparatus, image forming apparatus, and image forming system - Google Patents

Description

  The present invention relates to a crimping and binding apparatus that crimps and binds a bundle of sheets composed of a plurality of sheets, a sheet processing apparatus including the sheet binding apparatus, an image forming apparatus, and an image forming system.

  Conventionally, as an image forming system, post-processing such as binding processing, punching processing, (punch punching processing), sorting (collation processing), and folding processing is performed on a sheet or a sheet bundle on which an image is formed by an image forming apparatus. An apparatus equipped with an apparatus and designed to automate the work is known.

  In addition, as a sheet binding device that performs a binding process on a sheet bundle (folded sheet), a pair of crimping teeth having a concavo-convex shape is used without using a metal needle or an adhesive. 2. Description of the Related Art A sheet binding apparatus that employs a pressure binding method that pressurizes and binds a paper is known.

  For example, Patent Document 1 describes a sheet binding device (post-processing device) of the following image forming apparatus that presses and binds a sheet bundle using a pair of crimping teeth having an uneven shape. A pair of pressure-bonding teeth (pressure rod, fixed block) has a concave and convex shape (micro teeth), and a portion of the sheet bundle to be bound (near the end opposite to the folded sheet fold) And a plane part substantially perpendicular to each other at both ends of the plane part. Then, in a state where the sheet bundle is supported at a position where the binding process is performed, one of the crimping teeth (pressure rod) is pressed against the other crimping tooth (fixed block) and meshed (bag binding). ing).

  In the paper binding apparatus described in Patent Document 1, from the description of the examples and the drawings, a pressure in a direction perpendicular to the paper surface of the paper bundle is applied at the meshing portion composed of the flat surface portion and the side surface portion, and the paper fiber between the papers. It is considered that the sheets are bound together by binding the sheets.

  In the area near the both ends of the flat surface portion, in the process of being pressed, the difference between the inner and outer circumferences due to the thickness of the sheet bundle and the tension of the sandwiched sheet bundle (hereinafter referred to as the inner side) A deviation occurs between the sheets on the side contacting the concave shape (hereinafter referred to as the outside). The deviation between the sheets increases as the distance from the center of the plane portion increases. Then, the displacement between the papers and the pressure in the substantially vertical direction applied to the flat part can effectively increase the binding force of the papers in the vicinity of both ends of the flat part by binding the paper fibers. it can. However, in other regions, the displacement between the sheets is small, and the coupling force for effectively coupling the sheets cannot be increased.

  On the other hand, in the side surface portion, in the process of being pressurized, a deviation occurs between the inner and outer sheets in almost the entire region along the side surface portion. However, the pressure in the direction substantially perpendicular to the sheet bundle along the side surface effectively acts because of the difference between the inner and outer circumferences due to the thickness of the sheet bundle and the tension in the sandwiched sheet bundle. This is a region in the vicinity of both end portions of the side surface portion where the component force acts. With this component force acting on the sheet bundle, in the area near both ends of the side surface portion, the paper fibers can be effectively entangled to increase the binding force to bond the sheets together. Since the acting pressure is small, it is not possible to increase the coupling force for effectively coupling the sheets together.

For these reasons, in order to increase the binding force for binding the bundle of sheets, the applied pressure is increased to increase the area of the planar portion where the coupling force for coupling the sheets to each other due to the displacement between the sheets is increased, It is necessary to widen the region where the component force in the direction perpendicular to the surface acts. That is, it is necessary to increase the pressure-bonding area, which is the area of the area where the sheets are bonded together, by increasing the applied pressure to widen the area of the plane part or the side part where the bonding force to bond the sheets increases.
However, in order to increase the pressure so as to widen the crimping area, it is necessary to make each component constituting the paper binding device robust and to increase the output of the driving source that generates the pressure. May increase the size and cost. In addition, although the pressure-bonding area can be increased and the binding force can be increased as compared with the case where the pressure is not increased, the displacement between the sheets is small near the center of the plane part, and the pressure in the direction perpendicular to the side part is near the center of the side part. The ratio of the crimping area that is larger than the increased pressure is small.
That is, in the configuration described in Patent Document 1, even if the pressure is increased, the pressure-bonding area ratio that is larger than the increased pressure ratio is small, and it is difficult to increase the binding force for binding the paper bundle. .

  The present invention has been made in view of the above problems, and an object of the present invention is to bind a sheet bundle in a sheet binding apparatus that presses and binds a bundle of sheets using a pair of crimping teeth having an uneven shape. It is an object of the present invention to provide a sheet binding device capable of increasing the size with a lower pressure than before.

  In order to achieve the above object, the invention according to claim 1 is a paper binding device that presses and binds a bundle of paper using a pair of pressure-bonding teeth having a concavo-convex shape, wherein the pair of pressure-bonding teeth includes the pair of pressure-bonding teeth. At least one end in the pressing direction opposite to the concavo-convex shape has a flat portion formed in a plane substantially parallel to the paper surface of the bundle of sheets to be bound, respectively, and the concavo-convex shape, A pressure mechanism that moves at least one of the crimping teeth in a direction substantially perpendicular to the sheet; and a slide mechanism that moves at least one of the crimping teeth in a tooth width direction of the crimping tooth parallel to the paper surface. It is characterized by providing.

In the present invention, since the flat surface portions of the pair of crimping teeth are slid in the tooth width direction in a pressurized state, the paper fibers of the papers that are in contact with each other in almost the entire area of the pressed flat surface portion. Can be combined to increase the bonding strength of the sheets.
Therefore, as in the configuration of Patent Document 1, pressure is applied to the meshing portion formed by the plane portion substantially parallel to the sheet bundle and the side surface portion substantially perpendicular to the sheet bundle by applying pressure in a direction perpendicular to the sheet surface of the sheet bundle. Compared with the configuration in which the sheets are combined, the pressure-bonding area where the sheets are combined can be increased with a low pressure increase.
Therefore, the pressure-bonding area for binding the paper bundle with a low pressure rise is lower than the configuration of Patent Document 1 in which the pressure-bonding area ratio that is larger than the increased pressure ratio is small and it is difficult to increase the binding force for binding the paper bundle. And the binding force for binding the sheet bundle can be increased.

  The present invention relates to a sheet binding device that presses and binds a bundle of sheets using a pair of crimping teeth having a concavo-convex shape, and can increase the binding force for binding the bundle of sheets with a lower pressure than before. Can be provided.

1 is a schematic configuration diagram of an image forming system including an image forming apparatus and a sheet post-processing apparatus according to an embodiment. The example of the block diagram of the control part which the paper post-processing apparatus had. Operation | movement explanatory drawing of a pair of crimping tooth which provided the slope part which concerns on Example 1. FIG. Explanatory drawing of a pair of crimping tooth which provided the slope part which concerns on Example 1, and the plane part opposingly arranged. Explanatory drawing of the pressurization mechanism which moves an upper crimping tooth in the direction substantially perpendicular | vertical with respect to the paper surface of the paper bundle which performs a binding process. Explanatory drawing of the slide mechanism which slides the lower crimping tooth which is the other crimping tooth in a tooth width direction. Explanatory drawing of the pressurization mechanism and slide mechanism of a pair of crimping tooth which concern on Example 2. FIG. Operation | movement explanatory drawing which expanded the C section shown with the dashed-dotted line in the figure of FIG.

  Hereinafter, an image forming system 1 including a sheet post-processing device 3 that is a paper processing device provided with a paper binding device (end binding portion 25 and saddle stitching portion 35) to which the present invention is applied, and an image forming device 2 will be described. An embodiment will be described with reference to the drawings. In addition, this embodiment is only an example and this invention is not limited to the structure demonstrated below. For example, the present invention can also be applied to a sheet binding apparatus alone, an image forming apparatus including a sheet binding apparatus, an image forming apparatus including a sheet binding apparatus, and an image forming system including a sheet processing apparatus. FIG. 1 is a schematic configuration diagram of an image forming system 1 including an image forming apparatus 2 and a sheet post-processing apparatus 3 according to the present embodiment. FIG. 2 is an example of a block diagram of a control unit included in the sheet post-processing apparatus. is there.

  As shown in FIG. 1, the image forming system 1 includes an image forming apparatus 2 and a paper post-processing apparatus 3. The image forming apparatus 2 and the sheet post-processing apparatus 3 are connected so as to communicate with each other. In the image forming system 1, the image forming apparatus 2 forms an image on the paper P, and the paper post-processing apparatus 3 receives the paper P from the image forming apparatus 2 and performs various post-processing on the received paper P. Examples of the various post-processing performed on the received paper P include, for example, punching processing, end binding processing, and center folding processing with saddle stitching processing.

In the present embodiment, in the end binding process and the saddle stitching process, the sheet post-processing device 3 uses a part of the sheet bundle Pb formed by stacking a plurality of sheets P without using a needle or an adhesive. In other words, a so-called pressure-bonding method is employed in which a pair of pressure-bonding teeth having an uneven shape is pressed and bound.
Further, the sheet post-processing apparatus 3 that performs various post-processing as described above has a discharge mode, a punching processing mode, an end binding mode, and a center folding mode as operation modes. As the image forming apparatus 2, a known configuration can be applied, and in this embodiment, an electrophotographic color copying machine is provided. The image forming apparatus 2 includes, for example, a control unit, an image forming unit, an optical writing unit, a paper feeding unit, a paper feeding conveyance path, an image reading unit, an intermediate transfer unit, a fixing unit, a paper discharge conveyance path, a double-side conveyance path, etc. Both of them are not shown), and images are formed on both sides or one side of the paper P.

  The sheet post-processing apparatus 3 is provided with a first transport path Pt1 for receiving the sheet P discharged from the image forming apparatus 2 and discharging the sheet P to the first sheet discharge tray 10. Further, a second transport path Pt2 is provided that branches from the first transport path Pt1 and performs an end binding process or the like on the sheet bundle Pb. A third transport path Pt3 that is connected to the second transport path Pt2 and performs the saddle stitching and folding process on the sheet bundle Pb is also provided. Each of the transport paths Pt1 to Pt3 is formed by, for example, a plurality of transport rollers, guide members (not shown), and the like, and configures the transport unit 51.

  In the first transport path Pt1, the entrance roller 11, the punching portion 49, the transport rollers 12, 13 and the first paper discharge roller 14 are arranged in this order on the upstream side in the paper transport direction of the first transport path Pt1 (hereinafter simply referred to as the upstream side). ) Toward the downstream side in the paper conveyance direction (hereinafter simply referred to as the downstream side). The entrance roller 11, the transport rollers 12 and 13, and the first paper discharge roller 14 are rotationally driven by a motor (not shown) to transport the paper P. An inlet sensor 15 is disposed on the upstream side of the inlet roller 11, and the inlet sensor 15 detects that the paper P has been carried into the paper post-processing device 3.

  A first branch claw 17 is disposed on the downstream side of the conveying roller 12. The first branching claw 17 rotates and switches its posture so that the sheet P conveyed from the upstream side is separated from the downstream portion of the first branching claw 17 in the first conveyance path Pt1 by the second. It selectively guides to either one of the conveyance paths Pt2. The first branch claw 17 is driven by, for example, a motor or a solenoid.

In the discharge mode, the paper P carried into the first transport path Pt 1 from the image forming apparatus 2 is transported by the entrance roller 11, the transport rollers 12 and 13, and the first paper discharge roller 14, and is transferred to the first paper discharge tray 10. Discharged.
In the punching processing mode, after the paper P is detected by the entrance sensor 15, the entrance roller 11 transports the scheduled punching position of the paper P to the punching position of the punching portion 49, and stops the one end to perform the punching processing. , Transition to any one of the discharge mode, the end binding mode, and the middle folding mode.
In the end binding mode and the center folding mode, the paper P carried into the first transport path Pt1 is transported by the entrance roller 11 and the transport roller 12, and the traveling direction is changed by the first branch claw 17, It is transported to the second transport path Pt2.

  Conveying rollers 20, 21, and 22, a sheet stacking tray 23, a first jogger fence 24, and an end binding unit 25 that is a first sheet binding device are disposed in the second transport path Pt 2. The transport rollers 20, 21, and 22 are driven by a motor (not shown) to transport the paper P, and the first jogger fence 24 is driven by a motor (not shown) and is stacked on the paper stacking tray 23. The width direction position of the paper P is aligned. Further, a second branch claw 26 and a third branch claw 27 are disposed on the downstream side of the paper stacking tray 23. The second branch claw 26 and the third branch claw 27 are rotated to switch their postures, and the sheet bundle Pb or the paper P stacked on the paper stacking tray 23 is placed downstream of the first branch claw 17 in the first transport path. Is selectively guided to either one of the part and the third transport path Pt3. The second branch claw 26 and the third branch claw 27 are driven by, for example, a motor or a solenoid.

  In the edge binding mode, the sheets P received from the image forming apparatus 2 are sequentially stacked on the sheet stacking tray 23. As a result, the designated number (plurality) of sheets P are stacked to form a sheet bundle Pb. At this time, the rear end of each paper P abuts on a first movable reference fence (not shown) provided on the paper stacking tray 23, the paper transport direction position is aligned, and the width direction position is set by the first jogger fence 24. Aligned. The first movable reference fence is driven by a motor. Here, the sheet stacking tray 23, the first jogger fence 24, and the first movable reference fence constitute a first bundling unit 28 as a bundling unit that stacks a plurality of sheets P to form a sheet bundle Pb.

The first bundling unit 28 includes a motor for driving the first jogger fence 24 and a motor for driving the first movable reference fence, and the bundled sheet bundle Pb is bound at the end by the first movable reference fence. It is conveyed to the section 25.
As will be described in detail later, a pair of concave and convex crimping teeth is arranged on the end binding portion 25 so as to sandwich the sheet bundle Pb, and in the state where the sheet bundle Pb is present, one crimping tooth is connected to the other crimping tooth. The sheet bundle Pb is bound by a pressure binding method that applies pressure in the direction.

  The sheet bundle Pb bound at the end is conveyed (returned) to the first conveyance path Pt1 by the first movable reference fence, and then passes through the second branch claw 26 and the third branch claw 27, and then the conveyance roller 13 and It is conveyed by the first paper discharge roller 14 and discharged to the first paper discharge tray 10. Here, the first paper discharge roller 14 is an example of a paper discharge unit that discharges the sheet bundle Pb bound by the end binding unit 25.

  On the other hand, in the middle folding mode, the paper P transported to the second transport path Pt2 is not stacked on the paper stacking tray 23, but is transported by the transport rollers 20, 21, 22 and the first movable reference fence to the second branch claw. 26 and then transported to the third transport path Pt3. The second branch claw 26 is rotated and switched to a posture for guiding the paper P to the third transport path Pt3 before the paper P is transported by the first movable reference fence.

  In the third conveyance path Pt3, conveyance rollers 31 and 32 and a saddle stitch folding part 33 are arranged. The transport rollers 31 and 32 are driven by a motor to transport the paper P. The saddle stitch folding unit 33 includes a center folding unit 34, a saddle stitching unit 35 that is a second sheet binding device, and a second bundling unit 36. The saddle stitch folding part 33 is an example of a binding part forming part that forms a part to be bound.

  The sheets P transported to the third transport path Pt3 are sequentially accumulated in the second bundling unit 36 by the transport rollers 31 and 32, and a plurality of sheets P are stacked to form a sheet bundle Pb. That is, the second bundling unit 36 superimposes the designated number (plural) of sheets P conveyed through the conveyance path Pt3 of the conveyance unit 51 to form a sheet bundle Pb. At this time, the front end of the paper P abuts against the second movable reference fence 37, the paper transport direction position is aligned, and the width direction position is aligned by a second jogger fence (not shown).

  Then, the sheet bundle Pb in which the positions in the sheet conveyance direction and the width direction are aligned is in a state in which the vicinity of the center in the sheet conveyance direction is bound and saddle-stitched by the saddle stitching unit 35. The saddle-stitched sheet bundle Pb is returned by the second movable reference fence 37 to the center folding position corresponding to the sheet size. Here, the second movable reference fence 37 is driven by a motor (not shown).

  The sheet bundle Pb moved to the center folding position is folded in the middle in the sheet transport direction by the center folding section 34. In the center folding section 34, the center folding blade 38 facing the center of the sheet transport direction of the sheet bundle Pb transported to the center folding position moves from right to left in FIG. It pushes between a pair of press rollers 39 and 40, bending the center part of a conveyance direction. At this time, the folding blade 38 is driven by a motor (not shown).

  The folded sheet bundle Pb is pressed from above and below by the pair of pressing rollers 39 and 40. Here, the pair of pressing rollers 39 and 40 are driven by a motor (not shown). The sheet bundle Pb folded in this manner is discharged onto the second discharge tray 42 by the pressing rollers 39 and 40 and the second discharge roller 41. The second paper discharge roller 41 is driven by a motor (not shown).

  The entrance roller 11, the transport rollers 12, 13, 20, 21, 22, 31, and 32 and the paper discharge rollers 14 and 41 constitute a transport unit 51 together with a motor that drives them and a guide member. ing. Moreover, each branch nail | claw 17, 26, 27 comprises the path | route switching part 52 with the motor or solenoid which drives them.

Further, the sheet post-processing apparatus 3 includes a control unit 61 that controls the operation of each unit. The control unit 61 is a computer having a CPU, a storage unit, a communication interface, and the like. As shown in the example of the block diagram of FIG. 2, the control unit 61 is connected to the inlet sensor 15, the punching unit 49, the first bundling unit 28, the saddle stitch folding unit 33, the transport unit 51, the path switching unit 52, and the like. Has been. The control unit 61 (CPU) drives and controls each unit of the sheet post-processing apparatus 3 according to a program stored in the storage unit. Further, as described above, the control unit 61 is connected to a control unit (not shown) of the image forming apparatus 2 so that data communication is possible.
Next, the configurations and operations of the end binding unit 25 and the saddle stitching unit 35, which are the sheet binding devices provided in the sheet post-processing device 3 of the present embodiment, will be described with reference to the drawings. .

Example 1
First, Example 1 of the sheet binding device of this embodiment will be described with reference to the drawings.
Here, in the following description, unless otherwise distinguished, members having the same configuration or the same role are described with the same reference numerals.

  FIG. 3 is an operation explanatory diagram of the upper pressure-bonding tooth 101 and the lower pressure-bonding tooth 102 which are a pair of pressure-bonding teeth provided with the slope portion according to the present embodiment. FIG. 3A shows a state in which the upper crimping tooth 101 and the lower crimping tooth 102 are separated from each other when the sheet bundle Pb is conveyed, and FIG. The state when the plane part of the upper crimping tooth 101 and the lower crimping tooth 102 is in contact with the sheet bundle Pb is shown. FIG. 3C shows a state in which the sheet bundle Pb is bent between the upper crimping tooth 101 and the lower crimping tooth 102 as the crimping operation proceeds and the upper crimping tooth 101 moves downward. Is shown. In FIG. 3D, the sheet bundle Pb is pressurized between the upper crimping tooth 101 and the lower crimping tooth 102 as the crimping operation proceeds and the upper crimping tooth 101 moves downward. Indicates the state.

  FIG. 4 is an explanatory diagram of an upper crimping tooth 101 and a lower crimping tooth 102 which are a pair of crimping teeth provided with a sloped portion and a flat portion arranged opposite to each other according to the present embodiment, and FIG. FIG. 4 is an enlarged explanatory view of a portion B with which FIG. FIG. 5 is an explanatory diagram of the pressurizing mechanism 110a that moves the upper pressure-bonding teeth 101 in a direction substantially perpendicular to the sheet surface of the sheet bundle Pb to be bound. 6A and 6B are explanatory views of the slide mechanism 120 that slides the lower pressure-bonding tooth 102 that is the other pressure-bonded tooth in the tooth width direction, where FIG. 6A is a side surface explanatory view, and FIG.

  First, with reference to FIG. 3, a basic crimping method using an upper crimping tooth 101 and a lower crimping tooth 102 which are a pair of crimping teeth having an inclined surface with an uneven shape will be described. The sheet binding apparatus illustrated in FIG. 3 includes a pair of pressure-bonding teeth composed of an upper pressure-bonding tooth 101 that is an upper tooth and a lower pressure-bonding tooth 102 that is a lower tooth in FIGS. Yes. In this crimping binding method, as shown in FIG. 3A, when a sheet bundle Pb composed of a plurality of sheets P is conveyed, the upper crimping tooth 101 and the lower crimping tooth 102 are arranged so that the sheet bundle Pb can be received. Are separated from each other. However, as shown in FIG. 3D, when the concavo-convex shapes of the slope portions included in each are engaged, they are arranged at opposing positions so as to engage with each other via the sheet bundle Pb to be bound.

  Then, the movement of one or both of the upper crimping tooth 101 and the lower crimping tooth 102 is started. In the example shown in FIGS. 3A to 3D, the sheet surface of the sheet bundle Pb shown in FIG. 3A (hereinafter simply referred to as the sheet surface) by a pressurizing mechanism 110a (see FIG. 5) described later in detail. The upper crimping tooth 101 moves toward the lower crimping tooth 102 in a direction substantially perpendicular to), and the crimping operation proceeds. First, in the state of FIG. 3A, the crimping operation is started, the upper crimping tooth 101 moves to the lower crimping tooth 102 side, and the flat surface portion of the upper crimping tooth 101 and the lower crimping tooth 102 comes into contact with the sheet bundle Pb. The state shown in FIG. Further, when the crimping operation proceeds, as shown in FIG. 3C, the crimping operation proceeds, and as the upper crimping tooth 101 moves downward, between the upper crimping tooth 101 and the lower crimping tooth 102, The sheet bundle Pb is bent, and the folding of the sheet bundle Pb proceeds.

  Thereafter, the folding of the sheet bundle Pb proceeds, and the sheet bundle Pb is sandwiched between the upper crimping tooth 101 and the lower crimping tooth 102 shown in FIG. 3D, and further perpendicular to the paper surface of the sheet bundle Pb. Pressure is applied in any direction. That is, pressure is further applied in the direction perpendicular to the paper surface from the state shown in FIG. 3D, and the concave and convex shapes of the upper pressure-bonding teeth 101 and the lower pressure-bonding teeth 102 are transferred to the sheet bundle Pb, and the binding is completed.

  Here, unlike the pressure-bonded teeth described in Patent Document 1, the side surfaces of the upper pressure-bonded teeth 101 and the lower pressure-bonded teeth 102 that are a pair of pressure-bonded teeth are inclined with respect to the paper surface of the sheet bundle Pb. Each has an inclined surface having an arbitrary angle, which is a formed inclined surface. Specifically, the upper pressure-bonding teeth 101 have inclined surface portions 101a, b on both sides of a flat surface portion 101d formed with surfaces substantially parallel to the paper surface of the sheet bundle Pb formed in the lower portion that meshes with the opposed lower pressure-bonding teeth 102. have. On the other hand, the lower pressure-bonding teeth 102 have slope portions 102a, b that mesh with the slope portions 101a, b via the sheet bundle Pb. The upper portion facing the upper pressure-bonding tooth 101 has a flat surface portion 102c formed with a surface substantially parallel to the paper surface of the sheet bundle Pb, and the inclined surface portion 101a and the inclined surface portion 101b of the upper pressure-bonding tooth 101 are formed. Opposite the crossing point.

  In the present embodiment, the slope portions 101a and 101b and the slope portions 102a and 102b are respectively formed in the concave and convex shapes of the upper and lower pressure-bonding teeth 101 and 102, which are a pair of pressure-bonding teeth meshing with each other via the sheet bundle Pb as described above. ing. By pressing the sheet bundle Pb with these inclined portions, the extension of each sheet P is performed while applying the component force when pressing in the direction perpendicular to the inclined portions in almost the entire area along these inclined portions. Thus, the sheets that are in contact with each other are shifted in the direction along the slope portion. Since the sheets are displaced while applying the component force during pressurization in this way, they contact each other not only in the area near the end of the inclined surface but also in almost the entire area of the sheet bundle Pb pressed by the inclined surface. It is possible to increase the binding force by which the paper fibers are entangled with each other by entwining the paper fibers between the papers.

Then, as in the prior art, a configuration in which the sheets are joined by applying pressure in a direction perpendicular to the sheet surface of the sheet bundle to the meshing portion composed of the plane part substantially parallel to the sheet bundle and the side part perpendicular to the sheet bundle (for example, Compared with Patent Document 1), the pressure-bonding area where the sheets are coupled to each other can be increased by increasing the pressure.
Accordingly, the pressure-bonding area ratio that is larger than the increased pressure ratio is small, and the pressure-bonding area for binding the paper bundle Pb with a low pressure rise is lower than in the conventional configuration in which it is difficult to increase the binding force for binding the paper bundle. The binding force for binding the sheet bundle Pb can be increased.
Therefore, in a paper binding apparatus that presses and binds a bundle of sheets using a pair of crimping teeth having a concavo-convex shape, the binding force for binding the bundle of sheets Pb is greater than in the past by providing inclined portions in the concavo-convex shape. It is possible to provide a sheet binding device that can be enlarged with a low pressure increase.

  Further, in the example shown in FIG. 3, the end portions in the pressurizing direction are arranged so as to be opposed to the concave and convex shapes of the upper crimping tooth 101 and the lower crimping tooth 102 as a pair of crimping teeth when meshed via the sheet bundle Pb. Are different, and a space for retreating a sheet or a bundle of sheets is formed. By forming the concave-convex shape of each crimping tooth in this way, it is possible to form a space in which the sheet P or the sheet bundle Pb, which is pressed and stretched by each crimping tooth, retreats, and can reduce damage such as wrinkles. .

  Next, another configuration of the pair of pressure-bonding teeth of the sheet binding device that can increase the binding force for binding the sheet bundle Pb by increasing the pressure lower than the conventional one will be described with reference to FIG. In the example of the crimping tooth shown in FIG. 4, the uneven shape is different between the upper crimping tooth 101 and the lower crimping tooth 102 in FIG. Specifically, unlike the example described with reference to FIG. 3, as shown in the enlarged view of FIG. 4B, in the concavo-convex shape of the upper crimping tooth 101, the flat portion 102 c formed on the lower crimping tooth 102 is formed. A flat surface portion 101 c parallel to the flat surface portion 102 c of the lower pressure-bonding tooth 102 is formed at the facing position. That is, the uneven shape of the pair of pressure-bonding teeth includes slope portions 101 a and 101 b and slope portions 102 a and b, flat portions 101 c and d, and flat portions 102 c at arbitrary angles. The part 101c and the flat part 102c of the lower crimping tooth 102 are disposed to face each other.

Here, in each slope part 101a, b of the upper pressure-bonding tooth 101 and each slope part 102a, b of the lower pressure-bonding tooth 102, the sheet bundle Pb is in contact with each other in almost the entire area of the sheet bundle Pb pressed by each slope part. It is possible to increase the bonding force by which the paper fibers are entangled with each other by interlacing the paper fibers of the papers being processed.
Further, in detail, the tooth of each crimp tooth parallel to the paper surface of the sheet bundle Pb shown in FIG. 3A in a state where the pressure is applied by the pressure mechanism 110a by a slide mechanism 120 (see FIG. 6) described later. The lower crimping tooth 102 is slid in the width direction. In this way, since the planar portions of the pair of crimping teeth are slid in the tooth width direction in a pressurized state, they are in contact with each other in almost the entire area pressurized by the planar portions 101c and 102c. By binding the paper fibers of the papers, it is possible to increase the binding force of the papers.

Then, as in the conventional configuration, the sheets are joined to each other by applying pressure in a direction perpendicular to the sheet surface of the sheet bundle to the meshing portion composed of the plane part substantially parallel to the sheet bundle and the side part perpendicular to the sheet bundle. Compared to the configuration, the pressure-bonding area where the sheets are bonded to each other can be increased by increasing the pressure. Here, in the example shown in FIG. 4, an example in which the inclined surface portion and the flat surface portion opposed to each other is described, but the configuration in which the flat surface portion of the pair of pressure-bonding teeth is pressed and slid in the tooth width direction. In this way, the pressure-bonding area where the sheets are joined can be increased by increasing the pressure lower than that of the conventional configuration.
Accordingly, the pressure-bonding area ratio that is larger than the increased pressure ratio is small, and the pressure-bonding area for binding the paper bundle Pb with a low pressure rise is lower than in the conventional configuration in which it is difficult to increase the binding force for binding the paper bundle. The binding force for binding the sheet bundle Pb can be increased.
Therefore, by providing each flat portion opposed to the concavo-convex shape and sliding it in the tooth width direction while pressing at least one of the flat portions, the binding force for binding the sheet bundle Pb is lower than the conventional pressure. Therefore, it is possible to provide a sheet binding device that can be increased by increasing the height of the sheet.

  Further, as shown in FIG. 4, as shown in FIG. 4, in addition to the inclined portions to be pressed by the pressurizing mechanism 110a, opposed flat portions are provided, and the flat portions are provided by the pressurizing mechanism 110a. By sliding in the tooth width direction in a pressurized state, the crimping area can be further increased. That is, the binding force for binding the sheet bundle Pb can be further increased.

  Also, in the example shown in FIG. 4, when meshed via the sheet bundle Pb, the concave and convex shapes of the upper crimping tooth 101 and the lower crimping tooth 102 that are a pair of crimping teeth are arranged opposite to each other in one pressing direction. The shape of the end is different. Specifically, when meshing via the sheet bundle Pb, the flat surface portion 101c of the upper pressure-bonding tooth 101 and the flat surface portion 102c of the lower pressure-bonding tooth 102 are arranged to face each other. However, the flat surface portion 101d of the upper crimping tooth 101 faces the point where the slope portion 102a and the slope portion 102b of the lower crimp tooth 102 intersect. That is, when meshing with each other via the sheet bundle Pb, a space in which the sheet P or the sheet bundle Pb is retracted is formed in an area formed by the flat surface portion 101d of the upper crimping tooth 101 and the slope portions 102a and 102b of the lower crimping tooth 102. It is formed. By forming the concave-convex shape of each crimping tooth in this way, it is possible to form a space in which the sheet P or the sheet bundle Pb, which is pressed and stretched by each crimping tooth, retreats, and can reduce damage such as wrinkles. .

Next, using FIG. 5, the upper pressure-bonding teeth 101 and the lower pressure-bonding teeth 102 are moved in a direction substantially perpendicular to the paper surface of the sheet bundle Pb, and the upper pressure-bonding teeth 101 are moved toward the lower pressure-bonding teeth 102. A configuration of an example of the pressurizing mechanism 110a that performs pressurization will be described.
As shown in FIG. 5, the pressurizing mechanism 110 a slidably holds the lower pressure-bonding teeth 102 and is fixed to the apparatus main body via a fixing bracket 119, and the lower tooth arm 112 and the arm rotation shaft. And an upper tooth arm 111 rotatably supported through 118. Further, the upper pressure teeth 101 are held by the upper teeth arm 111. A tooth push cam 116 that rotates about the cam shaft 113 is provided at the end of the upper tooth arm 111 opposite to the side on which the upper pressure-bonding tooth 101 is held so as to contact from below. Yes.

  A cam drive gear 115 is coaxially fixed to the cam shaft 113, and a drive gear 114 is engaged with the cam drive gear 115, and a vertical drive motor (not shown) connected to the drive gear 114 is driven to rotate. Thus, the tooth pushing cam 116 rotates around the cam shaft 113. Then, by the non-linear rotational movement of the tooth pushing cam 116 by the cam shaft 113, the upper tooth arm 111 with which one end abuts rotates about the arm rotation shaft 118, and is held by the other end side. 101 moves toward and away from the lower crimping tooth 102 held by the lower tooth arm 112. That is, the upper tooth arm 111 is rotated by the rotation of the cam shaft 113, and the upper pressure-bonding tooth 101 held on the other end side of the upper tooth arm 111 is directed toward the lower pressure-bonding tooth 102. Push down in a direction approximately perpendicular to.

  As a result, the upper crimping tooth 101 moves downward in FIG. 5 and is pressed so as to come into contact with the lower crimping tooth 102. The sheet bundle Pb to be sandwiched is pressed in a direction substantially perpendicular to the sheet surface of the sheet bundle Pb at each plane portion. Further, a return spring 117 is installed on the upper tooth arm 111 on the side holding the fixing bracket 119 and the upper pressure-bonding tooth 101 in order to return the upper pressure-bonding tooth 101 to the original position separated from the lower pressure-bonding tooth 102. . Further, a rack 121 of a slide mechanism 120, which will be described later, is integrally provided on the lower pressure-bonding tooth 102, and the rack 121 is arranged in a direction substantially perpendicular to the tooth width direction of each pressure-bonded tooth parallel to the paper surface of the sheet bundle Pb. The horizontal movement gear 122 to be moved is engaged.

  By configuring the pressurizing mechanism 110a as described above, it is possible to make the configuration simpler than the pressurizing mechanism 110a described in the second embodiment to be described later, and the end binding portion 25 described with reference to FIG. Thus, the present invention can be easily applied to a configuration in which the sheet bundle Pb is bound at the end.

  Next, an example of the slide mechanism 120 that slides the lower pressure-bonding teeth 102 in the direction substantially perpendicular to the tooth width direction of each pressure-bonded tooth parallel to the paper surface of the sheet bundle Pb using FIGS. 6 (a) and 6 (b). The configuration of will be described. As shown in FIGS. 6A and 6B, a rack 121 is integrally provided on the lower press-fit tooth 102. This rack 121 is in the tooth width direction of each crimping tooth parallel to the paper surface of the sheet bundle Pb when the horizontal movement gear 122 is rotated by a horizontal drive motor (not shown). The slide operation is performed in the depth direction in the figure and in the direction of arrow A in FIG.

(Example 2)
Next, Example 2 of the sheet binding device of this embodiment will be described with reference to the drawings. The present embodiment differs from the above-described first embodiment only in that the slope portion and the flat portion provided on one of the crimping teeth are formed of different members.
Therefore, in the following description, like the first embodiment, unless otherwise distinguished, members having the same configuration or the same role are described with the same reference numerals. In addition, configurations and operations similar to those described in the first embodiment will be omitted as appropriate.

  FIG. 7 is an explanatory diagram of the pressurizing mechanism 110b and the slide mechanism 120 of the upper crimping tooth 101 and the lower crimping tooth 102, which are a pair of crimping teeth according to the present embodiment, and FIG. b) is an explanatory plan view. FIG. 8 is an operation explanatory diagram in which a portion C indicated by a dashed line in FIG. 7 is enlarged. 8A shows a state in which each slope portion and each plane portion are separated from each other, FIG. 8B shows a state in which the sheet bundle Pb is pressed by each slope portion, and FIG. 8C shows each slope portion. A state is shown in which the sheet bundle Pb is pressed by each plane portion.

  As shown in FIG. 7A, in the sheet binding device of the present embodiment, the sloped crimping member 131 that constitutes each sloped part of the upper crimping tooth 101 that is one of the crimped teeth, and the plane that constitutes each planar part. The crimping member 132 is constituted by a separate member. The inclined pressing member 131 and the flat pressing member 132 have a pressurizing mechanism 110b that applies pressure by moving the inclined pressing member 131 and the flat pressing member 132 toward the lower pressing teeth 102 in a direction substantially perpendicular to the paper surface of the sheet bundle Pb. . Further, similarly to another example of the first embodiment, a slide mechanism 120 is also provided that slides the lower pressure-bonding teeth 102 in a direction substantially perpendicular to the tooth width direction of each pressure-bonded tooth parallel to the paper surface of the sheet bundle Pb.

As shown in FIGS. 7A and 7B, the slide mechanism 120 provided in the paper binding apparatus of this embodiment for sliding the lower pressure-bonding teeth 102 will be described with reference to FIGS. 6A and 6B. Since this is the same as the slide mechanism described above, the description thereof is omitted.
The upper crimping tooth 101 and the pressurizing mechanism 110b, which are the features of the present embodiment, are configured as follows. As shown in FIG. 7A, the upper crimping tooth 101 is composed of a sloped crimping member 131 constituting each sloped part and a plane crimping member 132 constituting each planar part as separate members.
The inclined surface crimping member 131 rotates around the common cam shaft 138 that rotates by the rotational driving force of the vertical drive motor (not shown) transmitted to the common cam shaft 138, and performs a nonlinear rotational motion. The moving cam 136 moves up and down by coming into contact with the upper surface portion of the slope pressing member 131. Further, in order to return the slope crimping member 131 to the original position separated from each slope portion of the lower crimping tooth 102, the first compression spring 133 is fixed to the vicinity of both ends of the slope crimping member 131 and to the apparatus main body. Not installed between each bracket.

On the other hand, the flat crimping member 132 rotates around the common cam shaft 138 that rotates by the rotational driving force of the vertical drive motor (not shown) transmitted to the common cam shaft 138, and performs a non-linear rotational motion. The moving cam 137 moves up and down by coming into contact with the upper surface portion of the flat pressure bonding member 132. Further, in order to return the flat pressure bonding member 132 to the original position separated from the respective flat portions of the lower pressure bonding teeth 102, the second compression springs 134 are fixed to the vicinity of both ends of the inclined pressure bonding member 131 and to the apparatus main body. Not installed between each bracket.
Here, the common cam shaft 138 is the center of rotation of the slope vertical movement cam 136 and the horizontal vertical movement cam 137, and the slope crimping member 131 and the planar crimping member 132 operate with the same drive source. Yes.

The pressurizing mechanism 110b including the common cam shaft 138, the slope vertical movement cam 136, the horizontal vertical movement cam 137, and the like has the slope vertical movement as shown in FIGS. The cam 136 and the horizontal vertical movement cam 137 are moved up and down at different timings.
Specifically, in the state where the sheet bundle Pb (not shown) is not sandwiched, as shown in FIG. 8A, the slope vertical movement cam 136 is flat from the slope crimping member 131 and the horizontal vertical movement cam 137 is flat. Each is in a standby state separated from the crimping member 132. Thereafter, when the sheet bundle Pb is conveyed to a predetermined position and stopped, the common cam shaft 138 rotates counterclockwise in FIG. 8A, and the inclined surface vertical movement cam 136 is rotated as shown in FIG. 8B. Abutting on the upper surface portion of the slope crimping member 131, the slope crimping member 131 is pushed downward.

  As described above, the sheet bundle Pb that is sandwiched and pressed between the inclined surface pressing member 131 and the inclined surfaces of the lower pressure-bonding teeth 102 by pressing down the inclined surface vertical movement cam 136 is the same as in the first embodiment. It is possible to increase the binding force by which the paper fibers are entangled by interlacing the paper fibers. In other words, the bonding force that bonds the sheet bundle Pb to each other is increased in the entire area that is sandwiched and pressed between the inclined surface pressing member 131 and the inclined surface portions of the lower pressing teeth 102 at a lower pressure than before. In other words, it is in a so-called crimped and bound state.

  Thereafter, when the common cam shaft 138 is further rotated counterclockwise, the inclined surface vertical movement cam 136 causes the inclined pressing member 131 of the upper pressing tooth 101 to move to the lower pressing tooth as shown in FIG. Separate from 102. When the common cam shaft 138 is further rotated counterclockwise after the separation operation, the horizontal vertical cam 137 causes the planar crimping member 132 of the upper crimping tooth 101 to face downward toward the lower crimping tooth 102. Rotate to push down. The sheet bundle Pb is slid by the slide mechanism 120 in a state in which the sheet bundle Pb is pressed toward the lower crimp tooth 102 by the flat crimp member 132 of the upper crimp tooth 101 to increase the coupling force for bonding the sheets. be able to. That is, with a lower pressure than in the past, the bonding force that bonds the sheet bundle Pb to each other is increased in the entire area that is sandwiched and pressed between the planar crimping member 132 and each planar portion of the lower crimping tooth 102. In other words, it is in a so-called crimped and bound state.

  Then, the inclined crimping member 131 of the upper crimping tooth 101 shown in FIG. 8B is pushed down, and the sheet bundle Pb is pressed between the lower crimping tooth 102 and shown in FIG. 8C. The following phenomenon occurs when the sloped crimping member 131 and the slopes of the lower crimping teeth 102 are separated from each other. This is a phenomenon in which the stretched sheet bundle Pb tends to shrink by being sandwiched between the slopes of the slope crimping member 131 and the lower crimping teeth 102. Due to this phenomenon, the end portion on the side intersecting with the flat surface portion sandwiched between the inclined portion that is bound by the inclined surface pressing member 131 and the respective inclined surfaces of the lower press-bonding teeth 102 is slightly in the center of the flat surface portion. Move to the side. In the state in which the portion where the bonding force for joining the moved sheets is increased is again applied with pressure between the planar crimping member 132 of the upper crimping tooth 101 and each planar portion of the lower crimping tooth 102, the sheet bundle As Pb is slid, the coupling force for coupling the sheets further increases. That is, the inclined surface portion and the flat surface portion can be separately pressed, and the end portion on the side where the inclined surface portion and the flat surface portion intersect is pressed twice to increase the binding force for bonding the sheets and further increase the binding force. It can be enlarged.

  Further, pressure is applied in a direction substantially perpendicular to the paper surface of the sheet bundle Pb to increase the coupling force for coupling the sheets together at the inclined surface portion, and each planar portion is slid in a state where the pressure is applied to the planar portion. In the configuration in which the coupling force for coupling sheets is increased, the following phenomenon may occur. When the binding force for binding the sheet bundle Pb on the inclined surface is increased, the sheet P or the sheet bundle Pb extended by the engagement of the concavo-convex shape causes the sheet fibers of the sheets to be entangled when sliding each plane portion. In the vicinity of the end in the parallel tooth width direction along each slope.

The above phenomenon is caused by pressurizing the inclined surface portion as in the present embodiment, and then separating the inclined pressure bonding member 131 and each inclined surface of the lower pressure bonding teeth 102, and thereafter, the flat pressure bonding member 132 and each flat surface portion of the lower pressure bonding teeth 102. By sliding the sheet bundle Pb while applying pressure, it can be suppressed for the following reason. By separating the slope crimping member 131 and the slopes of the lower crimping teeth 102, the end portion on the side intersecting with the plane portion as described above moves slightly toward the center side of the plane portion. For this reason, when the stretched paper P or the paper bundle Pb is contracted and the flat portions are slid, the operation of entwining the paper fibers of the papers is hindered in the vicinity of the end portions in the parallel tooth width direction along the slope portions. This is because the phenomenon that occurs can be suppressed.
Therefore, after pressurizing at the slope portion, pressurization at the slope portion is stopped, and after separating the slope portion, the sheet bundle Pb is slid while pressing the sheet bundle Pb at the plane portion, thereby binding the sheet bundle Pb. The binding force can be further increased.

  Further, in the present embodiment, as described above, the inclined pressing member 131 and the flat pressing member 132 are pressed by the same vertical drive motor that rotationally drives the common cam shaft 138. As described above, by applying pressure to the inclined crimping member 131 and the planar crimping member 132 using the same drive source, the above-described effects can be obtained with an inexpensive configuration.

  In this embodiment, as in the first embodiment, as shown in FIG. 7A and FIG. 8B, when meshing with the sheet bundle Pb, the upper crimping tooth 101, which is a pair of crimping teeth, The shapes of the end portions in the pressing direction in which the concave and convex shapes of the lower pressure-bonding teeth 102 are opposed to each other are different. By making the difference in this way, a space in which the paper P or the paper bundle Pb is retracted is formed. Accordingly, as in the first embodiment, a space for retracting the sheet P or the sheet bundle Pb that is pressed and stretched by each crimping tooth can be formed, and damage such as wrinkles can be reduced.

  Further, in each of the above-described embodiments, the pressurizing mechanism 110a and the pressurizing mechanism 110b that pressurize the upper pressurizing tooth 101 by moving the upper pressurizing tooth 101 toward the lower pressurizing tooth 102 in a direction substantially perpendicular to the paper surface of the sheet bundle Pb has been described. However, the present invention is not limited to such a configuration. For example, you may comprise so that both the upper crimping tooth 101 and the lower crimping tooth 102 may be moved. That is, it is only necessary to provide a pressurizing mechanism that can press the sheet bundle Pb to be sandwiched by moving at least one of the upper crimping tooth 101 and the lower crimping tooth 102 in a direction substantially perpendicular to the sheet surface of the sheet bundle Pb.

  Further, the configuration in which the lower pressure-bonding teeth 102 are slid in the tooth width direction of each pressure-bonded tooth parallel to the paper surface of the sheet bundle Pb in a state where pressure is applied to each of the opposed flat portions has been described. Is not limited to such a configuration. For example, in a state where pressure is applied to each of the opposed flat portions, the upper pressure-bonding teeth 101 and the lower pressure-bonding teeth 102 are different in the tooth width direction of each pressure-bonded tooth parallel to the paper surface of the sheet bundle Pb. It is good also as a structure to slide to. That is, in a state in which pressure is applied to each of the opposed flat portions, at least one of the upper crimping tooth 101 and the lower crimping tooth 102 is moved in the tooth width direction of each crimping tooth, A slide mechanism that can slide the crimping tooth 102 in the tooth width direction may be provided.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
Paper binding such as the end binding part 25 and the saddle stitching part 35 that presses and binds a paper bundle such as the paper bundle Pb using a pair of crimping teeth such as a pair of upper and lower crimping teeth 101 and 102 having an uneven shape. In the apparatus, the pair of pressure-bonding teeth includes a flat portion 101c or a flat portion in which at least one end portion in the pressing direction of the concave and convex shapes facing each other is formed on a surface substantially parallel to the paper surface of the sheet bundle to be bound. The pressurizing mechanism 110a or the like is provided with a flat surface portion such as 102c in the concavo-convex shape and moves at least one of the crimping teeth such as the upper crimping tooth 101 in a direction substantially perpendicular to the paper surface. A pressure mechanism and a slide mechanism such as a slide mechanism 120 that moves at least one of the pressure-bonding teeth such as the lower pressure-bonding teeth 102 in the tooth width direction of the pressure-bonding teeth parallel to the paper surface are provided. When Is shall.
According to this, as described in the first embodiment, in a sheet binding device that presses and binds a bundle of sheets using a pair of crimping teeth having an uneven shape, the binding force for binding the bundle of sheets is conventionally increased. In addition, it is possible to provide a sheet binding device that can be enlarged with a low pressure increase.

(Aspect B)
Paper binding such as the end binding part 25 and the saddle stitching part 35 that presses and binds a paper bundle such as the paper bundle Pb using a pair of crimping teeth such as a pair of upper and lower crimping teeth 101 and 102 having an uneven shape. In the apparatus, a pressure mechanism such as a pressure mechanism 110a for moving at least one of the pressure-bonding teeth such as the upper pressure-bonding tooth 101 is provided in a direction substantially perpendicular to the paper surface of the bundle of sheets to be bound. Each of the concave and convex shapes has slope portions such as slope portions 101a and 101b and slope portions 102a and 102b formed on a surface inclined with respect to the paper surface.
According to this, as described in the first embodiment, in a sheet binding device that presses and binds a bundle of sheets using a pair of crimping teeth having an uneven shape, the binding force for binding the bundle of sheets is conventionally increased. In addition, it is possible to provide a sheet binding device that can be enlarged with a low pressure increase.

(Aspect C)
In (Aspect A) or (Aspect B), the pair of pressure-bonding teeth such as the upper pressure-bonding tooth 101 and the lower pressure-bonding tooth 102 is bound by at least one end in the pressing direction in which the concave and convex shapes are opposed to each other. A flat surface portion such as a flat surface portion 101c or a flat surface portion 102c formed on a surface substantially parallel to the paper surface of the paper bundle such as the paper bundle Pb, and inclined surface portions 101a, 101b formed on a surface inclined with respect to the paper surface; Each of the concave and convex shapes has slope portions such as slope portions 102a and 102b, and the pressurizing mechanism such as the pressurizing mechanism 110a and the tooth width direction of the crimping tooth parallel to the paper surface, A slide mechanism such as a slide mechanism 120 for moving at least one of the crimping teeth is provided.
According to this, as described in the first embodiment, the binding force for binding the sheet bundle can be further increased.

(Aspect D)
In (Aspect A) or (Aspect C), of the pair of pressure-bonding teeth such as the upper pressure-bonding tooth 101 and the lower pressure-bonding tooth 102, the flat pressure bonding member 132 of any pressure-bonded tooth such as the upper pressure-bonded tooth 101. The flat surface portion is constituted by a member different from the slope portion including the slope crimping member 131 and the like.
According to this, as described in the second embodiment, the inclined surface portion and the flat surface portion can be separately pressed, and the end portion on the side where the inclined surface portion and the flat surface portion intersect is pressed twice to form the paper. The coupling force that couples each other is increased, and the binding force can be further increased.

(Aspect E)
In (Aspect D), the pair of pressure bonding members such as the upper pressure-bonding teeth 101 and the lower pressure-bonding teeth 102 is a sheet bundle at the inclined surface portion formed by the inclined surfaces of the upper pressure-bonding teeth 101 and the inclined surfaces of the lower pressure-bonding teeth 102. After pressurizing a sheet bundle such as Pb, the pressurization is stopped, and after the inclined surface portion is separated, the planar portion including the planar crimping member 132 of the upper crimping tooth 101 and the planar portions of the lower crimping tooth 102, etc. The sheet bundle is pressurized.
According to this, as described in the second embodiment, the pressurization at the slope portion is stopped after the pressurization at the slope portion, the plane portion is pressed while pressing the sheet bundle at the flat portion after separating the slope portion. By sliding the part, the binding force for binding the sheet bundle can be further increased.

(Aspect F)
In (Aspect D) or (Aspect E), pressurization of the sloped portion made of the sloped crimping member 131 or the like and the planar portion made of the planar crimped member 132 or the like is performed using the same drive source such as a vertical drive motor. It is characterized by.
According to this, as described in the second embodiment, the inclined portion and the flat portion can be pressurized with the same drive source, so that the effect of (Aspect D) or (Aspect E) can be obtained with an inexpensive configuration. Can do.

(Aspect G)
In any one of (Aspect A) to (Aspect F), the crimping teeth such as the pair of upper crimping teeth 101 and the lower crimping teeth 102 are at least one end portion in the pressing direction in which the concave and convex shapes are arranged to face each other. Are different, and a space for retreating a sheet such as a sheet P or a sheet bundle such as a sheet bundle Pb is formed.
According to this, as described in the first and second embodiments, it is possible to form a space for retreating a sheet or a bundle of sheets that has been pressurized and stretched, and to reduce damage such as wrinkles.

(Aspect H)
In a sheet processing apparatus such as the sheet post-processing apparatus 3 including at least the sheet binding apparatus, the sheet binding apparatus includes the end binding unit 25 and the saddle stitching unit 35 of any one of (Aspect A) to (Aspect G). A sheet binding device is provided.
According to this, as described in the present embodiment, it is possible to provide a sheet processing apparatus that has the same effect as any of the sheet binding apparatuses of (Aspect A) to (Aspect G).

(Aspect I)
As an apparatus for performing the sheet binding process in an image forming apparatus such as the image forming apparatus 2 that performs at least a sheet binding process on a sheet bundle such as a sheet bundle Pb composed of a plurality of sheets P such as a plurality of sheets P after image formation. A paper binding device such as the end binding portion 25 or the saddle stitching portion 35 of any one of A) to (Aspect G) or a paper processing device such as the paper post-processing device 3 of (Aspect H) is provided. It is what.
According to this, as described in the present embodiment, the image forming apparatus that exhibits the same effects as the paper binding device of any one of (Aspect A) to (Aspect G) or the paper processing device of (Aspect H). Can be provided.

(Aspect J)
In an image forming system such as the image forming system 1 that performs at least a sheet binding process on a sheet bundle such as a sheet bundle Pb composed of a plurality of sheets such as a plurality of sheets P after image formation, H) a sheet processing apparatus such as the sheet post-processing apparatus 3 or an image forming apparatus such as the image forming apparatus 2 of (Aspect I).
According to this, as described in the present embodiment, it is possible to provide an image forming system that exhibits the same effect as the sheet processing apparatus of (Aspect H) or the image forming apparatus of (Aspect I).

DESCRIPTION OF SYMBOLS 1 Image forming system 2 Image forming apparatus 3 Paper post-processing apparatus 10 1st paper discharge tray 11 Entrance roller 12, 13 Conveyance roller (1st conveyance path)
14 First discharge roller 15 Entrance sensor 17 First branch claw 20, 21, 22 Conveying roller (second conveying path)
23 Paper stacking tray 24 First jogger fence 25 End binding portion 26 Second branch claw 27 Third branch claw 28 First bundling portion 31, 32 Conveying roller (third conveying path)
33 Saddle Stitch Folding 34 Saddle Folding Part 35 Saddle Stitching Part 36 Second Bundling Part 37 Second Movable Reference Fence 38 Middle Folding Blade 39, 40 Pressing Roller 41 Second Paper Discharge Roller 42 Second Paper Discharge Tray 49 Punching Part 51 Conveying unit 52 Path switching unit 61 Control unit 101 Upper crimping tooth 101a, b Slope (upper crimping tooth)
101c, d Plane part (upper crimping tooth)
102 Lower crimp tooth 102c Flat surface (lower crimp tooth)
102a, b Slope (lower crimping tooth)
110a, b Pressurization mechanism 111 Upper tooth arm 112 Lower tooth arm 113 Cam shaft 114 Drive gear 115 Cam drive gear 116 Tooth push cam 117 Return spring 118 Arm rotation shaft 119 Fixed bracket 120 Slide mechanism 121 Rack 122 Horizontal movement gear 131 Slope Crimp member 132 Flat crimp member 133 First compression spring 134 Second compression spring 136 Slope vertical movement cam 137 Horizontal vertical movement cam 138 Common cam shaft P Paper Pb Paper bundle Pt1 First transport path Pt2 Second transport path Pt3 Third Transport route

Japanese Patent Laid-Open No. 07-165365

Claims (9)

In a paper binding device that presses and binds a bundle of paper using a pair of crimping teeth having an uneven shape,
Each of the pair of pressure-bonding teeth has a planar portion formed on a surface substantially parallel to the paper surface of the bundle of sheets to be bound, with at least one end in the pressing direction opposite to the concave-convex shape. Have
A pressure mechanism that moves at least one of the crimping teeth in a direction substantially perpendicular to the paper surface, and at least one of the crimping teeth in a tooth width direction of the crimping tooth that is parallel to the paper surface. A sheet binding device comprising a slide mechanism. The sheet binding device according to claim 1 ,
The pair of crimping teeth, the ends of at least one of the pressing direction is uneven opposed of the slope portion formed on a surface that is paired to inclined to the plane of the sheet bundle stapled, the irregularities sheet binding device according to claim Tei Rukoto have respectively. In the paper binding apparatus according to claim 2 ,
Among prior Symbol pair of crimping teeth, the plane portion of one of the crimping teeth, paper binding apparatus characterized by being constituted by a separate member from the said inclined surface portion. In the paper binding apparatus according to claim 3 ,
The pair of crimping members stop pressing after pressing the sheet bundle at the inclined portion, and press the sheet bundle at the flat portion after separating the inclined portion. . In the paper binding apparatus according to claim 3 or 4 ,
A paper binding apparatus, wherein the inclined portion and the flat portion are pressurized using the same drive source. In the paper binding apparatus according to any one of claims 1 to 5 ,
The pair of pressure-bonding teeth has a shape in which at least one of the end portions in the pressing direction disposed opposite to the concave and convex shapes is different, and a space in which a sheet or a sheet bundle is retracted is formed. apparatus. In a paper processing device provided with at least a paper binding device,
Examples sheet binding device, a sheet processing apparatus comprising the sheet binding device according to any one of claims 1 to 6. In an image forming apparatus that performs at least a sheet binding process on a sheet bundle composed of a plurality of sheets after image formation,
Examples sheet binding processing of performing apparatus, an image forming apparatus characterized by comprising a sheet processing apparatus according to the paper binding device, or claim 7 as claimed in any one of claims 1 to 6. In an image forming system that performs at least sheet binding processing on a sheet bundle composed of a plurality of sheets after image formation,
Examples sheet binding processing of performing apparatus, an image forming system characterized by comprising an image forming apparatus according to the sheet processing apparatus, or claim 8 according to claim 7.

Images