JP2009179430A - Sheet binding processing unit, sheet post-processing device, and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sheet binding processing unit capable of binding sheets while rear ends of the sheets are aligned regardless of a loading amount of the sheets, a sheet post-processing device having the sheet binding processing unit and post-processing the delivered sheets, and an image forming device having the sheet-post processing device and an image forming device body. <P>SOLUTION: In this sheet binding processing unit 11, when a clincher 25 rotates and enters a sheet loading area U of a rear end fence (sheet rear end reference member) 7, an angle α formed by a sheet pressing face 31 of the clincher 25 and a sheet rear end reference face 33 of the rear end fence 7 is made into a right or acute angle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sheet binding processing unit that performs a binding process on a conveyed sheet, a sheet post-processing device that includes the sheet binding processing unit and performs post-processing on a sheet that has been carried in, and the sheet post-processing device and image forming apparatus main body. The present invention relates to an image forming apparatus.

  In Patent Document 1, as shown in FIG. 11, a sheet is provided with a driver 103 that drives a binding member into a sheet bundle stacked on a sheet trailing edge reference member 101, and a clincher 105 that bends the binding member that is driven into the sheet bundle. A binding processing unit 100 is disclosed.

  In the sheet binding processing unit 100, the clincher 105 pivotally supported by the driver 103 rotates about the fulcrum 107, and the binding end is sandwiched between the driver 103 and the clincher 105, and the binding is performed. Processing is to be performed. When the clincher 105 rotates, the binding is performed while the sheet pressing surface of the clincher 105 pushes and moves the sheet in the direction of the sheet receiving surface 109 of the driver 103.

Japanese Patent Laid-Open No. 2004-210417

  However, since the clincher 105 presses the sheet bundle while rotating, the component force F1 of the pressing force F in the rotation tangential direction of the clincher 105 (sheet rear end reference surface 111) is large. (The frictional force in the direction away from the sheet) may act on the sheet and the sheet may be lifted. If binding is performed in this state, there is a problem that the sheets are bound in a staircase state as shown in FIG.

  Further, this problem may occur when the sheet is face curled (the rear end of the sheet is close to the clincher 105 side) even when the sheet stacking amount is small. This is because the amount of movement while the trailing edge of the sheet is pushed by the clincher 105 is increased when binding is performed, and thus the time related to the component force F1 is increased, and the possibility of deviation is increased.

  Accordingly, the present invention provides a sheet binding processing unit capable of performing binding processing on a sheet in a state in which the trailing end of the sheet is aligned, regardless of the sheet stacking amount, and post-processing on a sheet that is provided with the sheet binding processing unit. It is an object of the present invention to obtain a sheet post-processing apparatus that performs the above and an image forming apparatus including the sheet post-processing apparatus and an image forming apparatus main body.

  In order to solve the above-described problem, the invention described in claim 1 is configured such that the conveyed sheet and the sheet trailing edge reference member serving as a reference for aligning the sheet trailing edge and the sheet trailing edge reference member are stacked. A sheet binding processing unit including a stapler that performs binding processing on a sheet bundle, the stapler driving a binding member into the sheet bundle, and a driver that is rotatably provided to press the sheet bundle toward the driver side. It has a clincher that bends the binding member driven into the sheet bundle and a drive unit that rotates the clincher between the standby position and the binding position, and the clincher rotates to enter the sheet stacking area of the sheet trailing edge reference member The angle between the sheet pressing surface of the clincher and the sheet rear end reference surface of the sheet rear end reference member is a right angle or an acute angle.

  According to a second aspect of the present invention, in the first aspect of the present invention, the driver is supported rotatably on an axis parallel to the rotation axis of the clincher, and the clincher is rotated by rotating the driver. The rotating shaft is rotated.

The invention described in claim 3 is characterized in that, in the invention described in claim 2, the clincher is out of the sheet stacking area of the sheet rear end reference member when in the standby position. The invention described in item 3 is characterized in that, in the invention described in item 3, a control unit for controlling the rotation of the driver is provided, and the control unit rotates the driver in accordance with the thickness of the sheet bundle.

  The invention described in claim 5 is characterized in that, in the invention described in claim 4, the driver is rotated in accordance with the number of sheets bound.

  The invention described in claim 6 is characterized in that, in the invention described in claim 4, the driver is rotated in accordance with the thickness of the sheet.

  The invention described in claim 7 is a sheet post-processing apparatus that includes the sheet binding processing unit according to any one of claims 1 to 6 and performs post-processing on the loaded sheet.

  According to an eighth aspect of the present invention, the sheet is a recording medium, and the image forming apparatus main body that forms the read image on the sheet, and the sheet carried from the image forming apparatus main body is post-processed. An image forming apparatus including the sheet post-processing apparatus.

  According to a ninth aspect of the present invention, a sheet is a recording medium, and an image forming apparatus main body that forms a read image on the sheet, and a binding process is performed on the sheet carried from the image forming apparatus main body. An image forming apparatus comprising the sheet binding processing unit according to any one of the above, and operating a control panel of a main body of the image forming apparatus to rotate a driver.

  According to the present invention, when a sheet bundle is bound, the sheet receives a frictional force from the sheet pressing surface of the clincher toward the sheet rear end reference surface regardless of the sheet stacking amount. It is possible to prevent movement in the direction of leaving. Therefore, the binding process can be performed on the sheets in a state where the trailing ends of the sheets are aligned regardless of the sheet stacking amount.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a state when the clincher according to the present embodiment enters the sheet stacking area of the rear end fence, and FIG. 2 shows a thicker sheet binding processing unit according to the present embodiment. FIG. 3 is a longitudinal sectional view showing a state in which the sheet bundle is bound, FIG. 3 is a longitudinal sectional view showing a state in which the sheet binding unit according to the present embodiment binds a thin sheet bundle, and FIG. FIG. 5 is a perspective view showing a configuration in which the stapler according to the embodiment moves in the sheet width direction, and FIG. 5 is a longitudinal sectional view showing the internal configuration of the sheet post-processing apparatus according to the present embodiment.

  As shown in FIG. 5, the image forming apparatus 3 according to the present embodiment performs an image forming apparatus main body 9 that forms an image of a document on a sheet, and a post-processing on a sheet on which an image is formed by the image forming apparatus main body 9 The sheet post-processing apparatus 1 is configured. In the present embodiment, the sheet is a sheet.

  The image forming apparatus main body 9 is a copier, and includes an image reading unit that reads an image of a document, an image forming unit that forms an image of the document read by the image reading unit on a sheet (recording medium), and a sheet in the image forming unit. And a sheet discharge unit 5 (see FIG. 5) that discharges the sheet on which the image is formed by the image forming unit to the sheet post-processing apparatus 1.

  As shown in FIG. 5, the sheet post-processing apparatus 1 includes a punch processing unit A that performs punch processing on a sheet discharged from the sheet discharge unit 5 of the image forming apparatus main body 9, and a binding processing unit F that performs binding processing on the sheet. And a folding processing unit G that performs folding processing on the sheet, a shift tray 13 that receives the post-processed sheet, an upper tray 15, and a lower tray 17.

  As shown in FIG. 5, the binding processing unit F performs a sheet binding processing unit 11 that performs a binding process on a loaded sheet, a jogger fence 53 that performs alignment in the width direction of the sheet, and a tapping that performs alignment of the sheet trailing edge T. A roller 47 and a sheet conveying mechanism 21 for carrying out the sheet bundle subjected to the binding process are provided. On the upstream side of the binding processing unit F, a pair of conveying rollers 19 for carrying sheets into the binding processing unit F is provided.

  As shown in FIG. 1, the sheet binding processing unit 11 stacks the loaded sheets and uses a trailing edge fence (sheet trailing edge reference member) 7 that serves as a reference for alignment of the sheet trailing edge T, and a sheet trailing edge T. And a stapler 22 that performs a binding process on the end surfaces of the aligned sheets.

  The stapler 22 includes a driver 23 that drives a binding needle (binding member), and a clincher 25 that presses the sheet bundle toward the driver 23 and bends the binding member that is driven into the sheet bundle.

  The driver 23 has a substantially L-shaped longitudinal section, a shaft (rotating shaft) 29 that supports the clincher 25 is fixed to one end side, and a sheet receiving surface 30 that receives a sheet during binding processing on the other end side. Is formed.

  The clincher 25 has a vertically long trapezoidal shape, and one end portion is supported by a shaft 29 fixed to the driver 23 and is rotatable. A sheet pressing surface 31 that presses the sheet toward the driver 23 during the binding process is formed at a position facing the other end side of the clincher 25 and the sheet receiving surface 30 of the driver 23. The clincher 25 is configured to rotate between the standby position X1 and the binding position Y by the drive unit 27 as shown in FIGS.

  The rear end fence 7 is substantially U-shaped with a vertical section opened upward, and the sheet receiving surface 35 on the driver 23 side and the sheet receiving surface 43 on the clincher 25 side face each other, and the sheet rear end reference surface 33 is located between the sheet receiving surface 35 and the sheet receiving surface 43. The sheet rear end reference surface 33 is a reference for aligning the sheet rear end T, and is perpendicular to the sheet receiving surface 35 on the driver 23 side. The sheet receiving surface 35 on the driver 23 side is substantially parallel to the sheet receiving surface 30 of the driver 23. The rear end fence 7 is provided at a position that does not hinder the binding process of the stapler 22.

  The shaft 29 that supports the clincher 25 is located farther from the sheet receiving surface 30 of the driver 23 than the sheet receiving surface 43 on the clincher 25 side of the rear end fence 7.

  That is, the positional relationship between the clincher 25 and the driver 23 is determined when the sheet pressing surface 31 of the clincher 25 reaches the position of the sheet receiving surface 43 on the clincher 25 side of the rear end fence 7 (clincher 25). The angle α formed by the sheet pressing surface 31 of the clincher 25 and the sheet rear end reference surface 33 of the rear end fence 7 is an acute angle (when 25 enters the sheet stacking region U of the rear end fence 7). . In the present embodiment, α = 80 °. The sheet stacking area U of the rear end fence 7 is an area inside the U-shape of the rear end fence 7.

  As shown in FIG. 4, the stapler 22 is driven via a timing belt 41 by a motor 39 capable of forward and reverse rotation, and moves in the sheet width direction in order to bind a predetermined position of the sheet end. A home position sensor 49 for detecting the home position of the stapler 22 is provided at one end of the moving range, and the binding position in the sheet width direction is controlled by the amount of movement of the stapler 22 from the home position.

  As shown in FIG. 5, the sheet transport mechanism 21 includes a discharge claw 52a that discharges a bundle of sheets subjected to the binding process, and a discharge belt 52 to which the discharge claw 52a is attached.

  The discharge belt 52 is disposed at the alignment center in the sheet width direction and is driven by a discharge motor via a drive shaft and a pulley. The discharge belt 52 is wound around a discharge roller 56 and a driven roller 57. The peripheral speed of the discharge roller 56 is set to be faster than the peripheral speed of the discharge belt 52.

  Next, an outline of the operation of the image forming apparatus 3 according to the present embodiment will be described. In response to a sheet supply signal from the image forming apparatus main body 9, the sheet is supplied from the sheet supply unit to the image forming unit, and an image of the document read by the image reading unit is formed on the sheet. The sheet on which the image has been formed is discharged from the sheet discharge unit 5 to the sheet post-processing apparatus 1.

  This will be described with reference to FIG. The sheet discharged to the sheet post-processing apparatus 1 is subjected to punch processing in the punch processing unit A as necessary. The sheet that has passed through the punch processing section is sorted by the branching claws 16 and 18 into a transport path B that leads to the upper tray 15, a transport path C that leads to the shift tray 13, or a transport path D that leads to the binding processing section F. The sheet guided to the binding processing unit F by the conveyance path D is subjected to the binding processing by the binding processing unit F and is guided to the shift tray 13 or conveyed to the folding processing unit G. The sheet subjected to the folding process in the folding processing unit G is guided to the lower tray 17 through the conveyance path H.

  As shown in FIG. 5, the sheets guided to the binding processing unit F by the transport roller 19 are sequentially stacked on the rear end fence 7. In this case, alignment in the vertical direction (sheet conveyance direction) is performed by the hitting roller 47 for each sheet, and alignment in the horizontal direction (sheet width direction orthogonal to the sheet conveyance direction) is performed by the jogger fence 53. The stapler 22 is driven by the binding processing signal from the image forming apparatus main body 9 between the job breaks, that is, between the last sheet of the sheet bundle and the first sheet of the next sheet bundle, and the binding processing is performed. The sheet bundle subjected to the binding process is immediately conveyed by the conveyance mechanism 21 to the folding processing unit G or sent to the sheet discharge roller 6 and discharged to the shift tray 13 set at the receiving position.

  Here, the flow of the binding process by the stapler 22 will be described by taking as an example a case where the number of sheets shown in FIG. 2 is large. The clincher 25 rotates, and the sheet pressing surface 31 of the clincher 25 applies a frictional force (a component force F2 of the pressing force F in the rotation tangential direction of the clincher 25) to the sheet. While pushing the sheet to the driver side. Then, the sheet is sandwiched between the clincher 25 and the driver 23, the binding member is driven into the sheet bundle from the driver 23, and the driven binding member is bent by the clincher 25. Similarly, when the number of sheets shown in FIG. 3 is small, a component force (frictional force) F3 of the pressing force F in the rotational tangential direction of the clincher 25 acts on the sheet. Since angle β)> (angle γ formed by F and F3), F2 <F3.

  Next, operations and effects of the sheet post-processing apparatus according to the present embodiment will be described. According to the present embodiment, when the clincher 25 presses the sheet, the sheet pressing surface 31 of the clincher 25 is applied to the sheet and the sheet rear end reference surface 33 of the rear end fence 7 regardless of the sheet stacking amount. Since the facing frictional force is applied, it is possible to prevent the sheet from moving in a direction away from the sheet rear end reference surface 33. Therefore, regardless of the sheet stacking amount, the sheet can be bound in a state where the sheet trailing edge T is aligned.

  According to the present embodiment, it is possible to provide the sheet post-processing apparatus 1 including the sheet binding processing unit 11 that has the same effect as the present embodiment.

  According to the present embodiment, it is possible to provide the image forming apparatus 3 including the sheet post-processing apparatus 1 and the image forming apparatus main body 9 that have the same effects as the present embodiment.

  Next, another embodiment of the present invention will be described. In the following description, parts having the same operational effects as those of the first embodiment described above are denoted by the same reference numerals, and the parts thereof are described. Detailed description will be omitted, and the following description will mainly focus on differences from the first embodiment described above.

  A second embodiment will be described with reference to FIGS. 6A is a longitudinal sectional view showing a state in which the stapler according to the present embodiment is located at the home position, and FIG. 6B is a diagram showing the stapler according to the present embodiment at the maximum rotation position. FIG. 7 is a vertical cross-sectional view showing the standby position of the clincher corresponding to the position of the stapler according to the present embodiment, and FIG. 8 is a binding processing unit according to the present embodiment. FIG. 9 is a block diagram showing a control configuration of the sheet post-processing apparatus according to the present embodiment.

  In the present embodiment, as shown in FIGS. 6A and 6B, the driver 23 is fixed to the support member 71. One end of the support member 71 is supported by the shaft 61 and is rotatable, and is rotated by the drive mechanism 63. The drive mechanism 63 is controlled by a post-processing control unit (control unit) 77.

  The drive mechanism 63 is provided on the other end side of the support member 71, and includes a stepping motor 65 and a cam 69 driven by the stepping motor 65 via a gear 67. The cam 69 has a disk shape, and a cylindrical pin 73 is erected on one end surface of the cam 69. At the other end of the support member 71, a long hole 75 is formed substantially parallel to the sheet receiving surface 30 of the driver 23, and is engaged with the pin 73. Accordingly, the pin 73 moves along the long hole 75 at the same time as the cam 69 rotates, and the stapler 22 rotates as the pin 73 moves.

  As shown in FIG. 6A, when the cam 69 rotates in the direction of the arrow J, the stapler 22 rotates in the direction of the arrow K. As shown in FIG. Is rotated in the direction of arrow L, the stapler 22 is rotated in the direction of arrow N.

  That is, the stapler 22 can move between the home position and the maximum rotation position by the forward / reverse rotation of the stepping motor 65, and can maintain the position therebetween. As shown in FIG. 6A, the stapler 22 is inclined at an angle Q with respect to the vertical axis at the home position, and as shown in FIG. 6B, the stapler 22 is at the maximum rotation position. Is inclined at an angle R (> Q) with respect to the vertical axis.

  As shown in FIG. 7, the rotation range of the stapler 22 is limited to a range in which the standby position of the clincher 25 is a position deviating from the sheet stacking region U of the rear end fence 7. The standby position X1 is the standby position of the clincher 25 when the stapler 22 is at the home position shown in FIG. 6A, and the standby position X2 is the maximum rotation position of the stapler 22 shown in FIG. 6B. Is the standby position of the clincher 25.

  The post-processing control unit 77 includes a receiving unit 81 that receives a signal from the print control unit 79 of the image forming apparatus main body 9, a sheet counting unit 85 that counts the number of sheets conveyed to the binding processing unit F, and a receiving unit. 81 and a determination unit 83 that determines the situation based on information from the sheet count unit 85, an execution unit 87 that executes processing according to the determination of the determination unit 83, and transmission that transmits processing contents of the execution unit 87 to the binding processing unit F Department. The print control unit 79 is connected to the operation unit 91 of the image forming apparatus main body 9. The sheet count unit 85 is connected to a sheet sensor 86 (see FIG. 5) provided on the upstream side of the binding processing unit F.

  A control flow of the binding processing unit F according to the present embodiment will be described with reference to FIG. When the number of bound sheets is а or less (YES in S1), the angle of the stapler 22 is rotated by A ° from the home position (S2), and then the sheet is carried into the rear end fence 7 (S4). On the other hand, when the number of sheets to be bound is а or more (NO in S1), the angle of the stapler 22 is rotated by B ° (> A °) from the home position (S3), and then the sheet is carried into the rear end fence 7 ( S4). When the final sheet is loaded (YES in S5), the sheet bundle is bound by the stapler 22 (S6), and the sheet bundle is unloaded (S7). If the desired (set) number of bindings is not bound, the process returns to S4 (NO in S8), and if the desired number of bindings is bound, the flow ends (NO in S8).

  In general, when the binding process is performed using a stapler, it is preferable that the sheet pressing surface of the clincher is pressed against the sheet bundle in a state as flat as possible.

  Therefore, in this embodiment, when the number of sheets to be bound is small (when the number is а or less), the rotation angle of the stapler 22 is reduced (A °), and the number of sheets to be bound is large (а In the case of more than one sheet, the rotation angle of the stapler 22 is increased (B °).

  According to the present embodiment, the shaft (rotating shaft) 29 that supports the clincher 25 can be rotated by rotating the stapler 22 (rotating the driver 23) according to the number of sheets bound. Therefore, regardless of the number of sheets bound, the sheet pressing surface 31 of the clincher 25 can be pressed against the sheet bundle in a substantially flat state.

  When the clincher 25 is in the standby position, the clincher 25 is out of the sheet stacking area U of the trailing edge fence 7, and thus does not hinder the stacking of sheets on the trailing edge fence 7.

  The shaft 29 that supports the clincher 25 can be rotated by automatically rotating the stapler 22 (rotating the driver 23) according to the number of sheets bound.

  It is possible to provide the sheet post-processing apparatus 1 including the sheet binding processing unit 11 that achieves the same effect as the present embodiment.

  The image forming apparatus 3 including the sheet post-processing apparatus 1 and the image forming apparatus main body 9 having the same effects as the present embodiment can be provided.

  Next, a third embodiment will be described with reference to FIG. FIG. 10 is a plan view of the operation panel of the image forming apparatus main body according to the present embodiment.

  As in the second embodiment, in the control according to the number of sheets to be bound, after the sheet, depending on conditions such as a difference in thickness depending on the sheet type, a curl state of the sheet, and a difference in stiffness depending on the sheet type. There is a possibility that misalignment of the end T (the sheet is displaced in a direction away from the sheet rear end reference surface 31) may occur.

  By the way, the closer the position of the stapler 22 is to the maximum rotation position (see FIG. 6), that is, the closer the standby position of the clincher 25 is to X2 (see FIG. 7), the more the clincher 25 presses the sheet. The sheet pressing surface 31 can apply a greater frictional force to the sheet toward the sheet rear end reference surface 33.

  Therefore, in the third embodiment, in addition to the configuration of the second embodiment, as shown in FIG. 10, a sheet trailing edge misalignment elimination dial 95 is provided on the operation panel 93 of the image forming apparatus main body 9.

  The driver 23 can be rotated to the maximum rotation position side by rotating the sheet rear end misalignment elimination dial 95 clockwise. On the other hand, the driver 23 can be turned to the home position side by turning the sheet rear end misalignment elimination dial 95 counterclockwise. The amount of rotation of the stapler 22 is proportional to the amount of rotation of the dial.

  Accordingly, when the deviation of the rear end of the bound sheet bundle is small, the misalignment of the sheet rear end T can be eliminated by turning the sheet rear end misalignment elimination dial 95 small clockwise. On the other hand, if the deviation of the trailing edge of the bound sheet bundle is large, the sheet trailing edge misalignment elimination dial 95 can be rotated clockwise to eliminate the sheet trailing edge T misalignment.

  According to the present embodiment, the sheet trailing edge T is controlled in the control according to the number of sheets to be bound, depending on conditions such as a difference in thickness depending on the sheet type, a curl state of the sheet, and a difference in stiffness depending on the sheet type. When the misalignment occurs, the user can solve the misalignment of the sheet trailing edge T by turning the sheet trailing edge misalignment elimination dial 95 (operating the operation panel).

  It is possible to provide the sheet post-processing apparatus 1 including the sheet binding processing unit 11 that achieves the same effect as the present embodiment.

  The image forming apparatus 3 including the sheet post-processing apparatus 1 and the image forming apparatus main body 9 having the same effects as the present embodiment can be provided.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

  In the second embodiment, the sheet sensor 86 and the sheet count unit 85 count the number of sheets bound and control the drive mechanism 63. Instead, the operation unit 91 of the image forming apparatus main body 9 controls the sheet. The drive mechanism 63 may be controlled in response to the notification of the number of bindings.

  In the second embodiment, the driver is rotated according to the number of sheets bound, but instead, the driver may be rotated according to the thickness of the sheet. In this case, it is preferable to control the driving mechanism 63 upon receiving a notification of the sheet thickness from the operation unit 91 of the image forming apparatus main body 9.

  In the second embodiment, the driver is rotated according to the number of sheets bound, but instead, the driver may be rotated according to the sheet thickness and the number of sheets bound (sheet bundle thickness). good.

  In the third embodiment, the operation panel 93 of the image forming apparatus main body 9 is provided with a sheet trailing edge misalignment elimination dial 95. Instead, a touch panel 97 provided on the operation panel 93 (see FIG. 10). It is also possible to display the sheet trailing edge misalignment elimination display and operate it. If the deviation of the trailing edge of the sheet bundle is large, the time for touching the sheet trailing edge misalignment elimination display is lengthened, and if the deviation of the trailing edge of the sheet bundle is small, the time for touching the sheet trailing edge misalignment elimination display. It is better to make the configuration shorter.

  In the first embodiment, the positional relationship between the clincher 25 and the driver 23 is determined so that the clincher 25 enters the sheet stacking region U of the rear end fence 7 and the sheet pressing surface 31 of the clincher 25 and the rear end fence 7 after the sheet. The angle α formed with the end reference surface 33 is set to 80 ° (acute angle), but is not limited thereto, and the positional relationship between the clincher 25 and the driver 23 is determined, and the clincher 25 is the sheet stacking region U of the rear end fence 7. When entering, the angle α formed by the sheet pressing surface 31 of the clincher 25 and the sheet rear end reference surface 33 of the rear end fence 7 may be set to 70 ° (acute angle).

  In the above-described embodiment, the positional relationship between the clincher 25 and the driver 23 is determined so that the clincher 25 enters the sheet stacking region U of the rear end fence 7 and the sheet pressing surface 31 of the clincher 25 and the rear end fence 7 after the sheet. The angle α formed with the end reference surface 33 is an acute angle, but instead, the positional relationship between the clincher 25 and the driver 23 is determined when the clincher 25 enters the sheet stacking region U of the rear end fence 7. In addition, the angle α formed by the sheet pressing surface 31 of the clincher 25 and the sheet rear end reference surface 33 of the rear end fence 7 may be a right angle.

  In the above-described embodiment, the image forming apparatus main body 9 is a copying machine including an image reading unit. However, the image forming apparatus main body is not limited thereto, and the image forming apparatus main body may be a printer that does not include an image reading unit. .

It is a longitudinal cross-sectional view which shows a state when the clincher concerning 1st Embodiment approachs into the sheet | seat stacking area | region of a rear-end fence. It is a longitudinal cross-sectional view which shows the state in which the sheet binding process unit which concerns on 1st Embodiment binds a thick sheet bundle. It is a longitudinal cross-sectional view which shows the state in which the sheet binding processing unit which concerns on 1st Embodiment binds a thin sheet bundle. It is a perspective view which shows the structure which the stapler which concerns on 1st Embodiment moves to a sheet | seat width direction. It is a longitudinal cross-sectional view which shows the internal structure of the sheet | seat post-processing apparatus which concerns on 1st Embodiment. (A) is a longitudinal cross-sectional view which shows the state which the stapler based on 2nd Embodiment is located in a home position, (b) shows the state where the stapler which concerns on 2nd Embodiment is located in the maximum rotation position. It is a longitudinal cross-sectional view. FIG. 6 is a longitudinal sectional view showing a clincher standby position corresponding to a position of a stapler according to a second embodiment, and is a plan view of an operation panel of the image forming apparatus main body according to the first embodiment. It is a flowchart which shows the flow of control of the binding process part which concerns on 2nd Embodiment. It is a block diagram which shows the structure of control of the sheet | seat post-processing apparatus which concerns on 2nd Embodiment. It is a top view of the operation panel of the image forming apparatus main body which concerns on 3rd Embodiment. It is a longitudinal cross-sectional view which shows the outline of the sheet binding processing unit which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet post-processing apparatus 3 Image forming apparatus 7 Rear end fence (sheet rear end reference member)
DESCRIPTION OF SYMBOLS 9 Image forming apparatus main body 11 Sheet | seat binding processing unit 22 Stapler 23 Driver 25 Clincher 27 Drive part 29 Axis (Clincher rotation axis)
31 Sheet pressing surface 33 Sheet rear end reference surface 61 axis (rotating shaft of driver)
77 Post-processing control unit (control unit)
93 Operation Panel T Sheet Rear End X1 Standby Position X2 Standby Position Y Binding Position U Sheet Stacking Area α Angle formed by the sheet pressing surface and the sheet rear end reference surface

Claims (9)

  The sheet binding processing unit includes a sheet trailing edge reference member that serves as a reference for stacking conveyed sheets and aligning the sheet trailing edge, and a stapler that performs binding processing on a sheet bundle stacked on the sheet trailing edge reference member. The stapler includes a driver that drives the binding member into the sheet bundle, a clincher that is rotatably provided to the driver and presses the sheet bundle toward the driver to bend the binding member that is driven into the sheet bundle, and the clincher is bound to the standby position. A drive unit that rotates between the position of the clincher and the sheet pressing surface of the clincher and the sheet rear end reference member after the sheet when the clincher rotates and enters the sheet stacking area of the sheet rear end reference member. The sheet binding processing unit is characterized in that an angle formed with the end reference surface is a right angle or an acute angle.   The driver is rotatably supported on an axis parallel to the rotation axis of the clincher, and the rotation axis of the clincher is rotated by rotating the driver. Sheet binding processing unit.   3. The sheet binding processing unit according to claim 2, wherein the clincher is out of the sheet stacking area of the sheet trailing edge reference member when in the standby position.   The sheet binding processing unit according to claim 3, further comprising a control unit that controls rotation of the driver, wherein the control unit rotates the driver according to the thickness of the sheet bundle.   5. The sheet binding processing unit according to claim 4, wherein the driver is rotated in accordance with the number of sheets bound.   The sheet binding processing unit according to claim 4, wherein the driver is rotated according to the thickness of the sheet.   A sheet post-processing apparatus comprising the sheet binding processing unit according to any one of claims 1 to 6 and performing post-processing on a loaded sheet.   The sheet is a recording medium, and includes an image forming apparatus main body that forms a read image on the sheet, and an image that includes the sheet post-processing apparatus according to claim 7 that performs post-processing on the sheet loaded from the image forming apparatus main body. Forming equipment.   The sheet is a recording medium, and the image forming apparatus main body that forms a read image on the sheet, and the sheet binding according to any one of claims 2 to 6, wherein the sheet is fed from the image forming apparatus main body. An image forming apparatus comprising: a processing unit; and operating a control panel of a main body of the image forming apparatus to rotate a driver.

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