Patent Grant
8408531
This application is based on and claims priority under 35 U.S.C. 119 from Japanese Patent Application No. 2010-186021 filed on Aug. 23, 2010.
1. Technical Field
The present invention relates to a recording medium post-processing apparatus and an image forming system.
2. Related Art
There are image forming apparatuses, such as printers or copying machines, to which recording medium post-processing apparatuses for performing post-processing on recording media on which images have been formed are connected.
According to an aspect of the invention, there is provided a recording medium post-processing apparatus including:
Exemplary embodiments of the present invention will be described in detail based on the following figures, wherein:
An exemplary embodiment of the invention will be described in detail below with reference to the accompanying drawings.
<Description of Image Forming System>
<Description of Image Forming Apparatus>
The image forming apparatus 2 includes a sheet feed section 6 and an image forming section 5. The sheet feed section 6 feeds a sheet S. The image forming section 5 forms an image on the sheet S, which is fed from the sheet feed section 6, by an electrophotographic method. Meanwhile, a structure for forming an image by an ink-jet method or the like may be used as the image forming section 5. Further, the image forming apparatus 2 includes a sheet reversing device 7 and carrying rollers 9. The sheet reversing device 7 reverses the surface of the sheet S on which an image has been formed by the image forming section 5. The carrying rollers 9 take out the sheet S on which an image has been formed. Furthermore, the image forming apparatus 2 includes a user interface 90 that receives information from a user. Here, the sheet feed section 6 includes first and second sheet stacking units 61 and 62 on which sheets S are stacked. Moreover, the sheet feed section 6 includes conveying rollers 65 and 66. The conveying roller 65 conveys the sheets S, which are stacked on the first sheet stacking unit 61, toward the image forming section 5. The conveying roller 66 conveys the sheets S, which are stacked on the second sheet stacking unit 62, toward the image forming section 5.
<Description of Sheet Processing Apparatus>
The sheet processing apparatus 3 includes a conveying device 10 and a main body section 30. The conveying device 10 conveys the sheets S that are taken out from the image forming apparatus 2. The main body section 30 is provided with a sheet stacking unit 35 where the sheets S conveyed by the conveying device 10 are stacked, a stapler 40 that binds the end portions of the sheets S, and the like. Further, the sheet processing apparatus 3 includes a control section 80 that controls the entire image forming system 1. The control section 80 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an HDD (Hard Disk Drive) (which are not shown). A processing program for controlling the image forming system 1 is executed in the CPU. Various programs, various tables, parameters, and the like are stored in the ROM. The RAM is used as a work area and the like when the processing program is executed by the CPU.
The conveying device 10 of the sheet processing apparatus 3 includes inlet rollers 11 and a puncher 12. The inlet rollers 11 are a pair of rollers that receives the sheet S taken out by the carrying rollers 9 of the image forming apparatus 2. The puncher 12 bores a hole through the sheet S that is received by the inlet roller 11 as necessary. Further, the conveying device 10 includes first and second conveying rollers 13 and 14 that are disposed on the downstream side of the puncher 12. The first conveying rollers 13 are a pair of rollers that conveys a sheet S to the downstream side. The second conveying rollers 14 are a pair of rollers that conveys a sheet S toward the main body section 30.
The main body section 30 of the sheet processing apparatus 3 is provided with a main body frame 36 that is formed in the shape of a box. Moreover, the main body section 30 is provided with receiving rollers 31 that is a pair of rollers for receiving a sheet S from the conveying device 10. Further, the main body section 30 is provided with the sheet stacking unit 35 and exit rollers 34. The sheet stacking unit 35 is disposed on the downstream side of the receiving roller 31, and sheets S are stacked on the sheet stacking unit 35. The exit rollers 34 are a pair of rollers for taking out a sheet S toward the sheet stacking unit 35. Furthermore, the main body section 30 is provided with a paddle 37. The paddle 37 is rotated in a clockwise direction in
Moreover, the main body section 30 is provided with an ejection roller 39 that can be moved in a direction where the ejection roller approaches the sheet stacking unit 35 and in a direction where the ejection roller is separated from the sheet stacking unit 35. When a sheet S is stacked on the sheet stacking unit 35, the ejection roller 39 retracts to a position separated from the sheet stacking unit 35 (a position above the sheet stacking unit 35 in a vertical direction). Further, when a bundle of sheets S (hereinafter, referred to as a “sheet bundle T”) is taken out from the sheet stacking unit 35, the ejection roller 39 is moved until coming into contact with a sheet bundle T. Then, the ejection roller 39 conveys the sheet bundle T to the downstream side while being rotated.
Furthermore, the main body section 30 includes a stapler 40. The stapler 40 binds the end portion of the sheet bundle T, which is stacked on the sheet stacking unit 35, (the rear end portion of the sheet bundle T in the conveying direction of the sheet bundle T) by staples.
Moreover, the main body section 30 includes an opening 69 at the side wall of the main body frame 36. The opening 69 is used to take out a sheet bundle T that is conveyed by the ejection roller 39.
In addition, the main body section 30 is provided with a binding device 500. The binding device 500 performs binding processing on the front end portion of the sheet bundle T that is conveyed by the ejection roller 39 (the front end portion of the sheet bundle T in the conveying direction of the sheet bundle T). Unlike the stapler 40 that performs binding processing by using staples, the binding device 500 performs binding processing with a method of combining sheets S by deforming the sheet bundle T in a thickness direction without using staples. Meanwhile, the binding device 500 is formed separately from the main body frame 36, and is set to be removed from the main body frame 36.
Further, the main body section 30 is provided with a sheet bundle stacking unit 70 where the sheet bundle T bound by the stapler 40 and the sheet bundle T bound by the binding device 500 are stacked. The sheet bundle stacking unit 70 is adapted to be moved down according to the amount of the stacked sheet bundle T. Furthermore, when the binding processing performed by the stapler 40 is switched to the binding processing performed by the binding device 500 and when the binding processing performed by the binding device 500 is switched to the binding processing performed by the stapler 40, the control section 80 performs a control to switch the output direction of image data so that a portion of the sheet bundle bound in each binding processing becomes an upper or left portion of an image.
<Description of Binding Device>
Next, the binding device 500, which performs binding processing by deforming the sheet bundle T in the thickness direction, will be described in detail.
As shown in
Further, the binding device 500 is provided with first and second binding units 510 and 520.
That is, the binding device 500 is provided with a moving mechanism (not shown) that moves the first and second binding units 510 and 520. Further, the first and second binding units 510 and 520 are adapted to be moved in the direction orthogonal to the conveying direction of the sheet bundle T by motors M (see
<Description of Configuration of Binding Device>
Subsequently, the configuration of the first and second binding units 510 and 520 of the binding device 500 will be described. Meanwhile, since the first and second binding units 510 and 520 have the same configuration, the first binding unit 510 will be described here as an example.
First, as shown in
As shown in
Meanwhile, a hole portion 512A where the punching member 505 of the moving frame 511A enters is formed at the lower frame 512 as shown in
In the binding device 500, the rotating plate 513 is received in the lower frame 512 as shown in
As shown in
Further, the binding device 500 is provided with support members 512F and protruding pins 512G. The support member 512F includes an elongated hole NA at one end portion thereof, and supports the shaft 512D at the other end portion thereof. The protruding pin 512G protrudes into the elongated hole NA of the support member 512F from the lower surface of the upper plate 512E. A second coil spring KS2 is provided in the elongated hole NA of the support member 512F. The second coil spring KS2 is provided so as to be closer to the shaft 512D than the protruding pin 512G, and moves the support member 512F in a direction where the support member is separated from the protruding pin 512G. Furthermore, there are provided guides G that are disposed on both sides of the support member 512F and guide the support member 512F being moved.
Moreover, in the binding device 500, a first regulating part 401 for regulating the rotation of the rotating plate 513 is mounted on the device frame 530 (see
In the binding device 500, the punching member 505 (see
<Description of Binding Processing>
In the sheet processing apparatus 3 of this exemplary embodiment, any one or both of the binding processing that is performed using staples by the stapler 40 and the binding processing that is performed through the deformation of the sheet bundle T in the thickness direction by the binding device 500 are performed according to the selection of a user. The binding processing performed by the stapler 40 and the binding processing performed by the binding device 500 will be described below with reference to
<Description of Binding Processing Performed by Stapler>
First, the binding processing performed by the stapler 40 will be described.
When binding processing is performed by the stapler 40, the sheet bundle stacking unit 70 (see
For this reason, the sheet bundle stacking unit 70 is moved up first in this exemplary embodiment, so that the front end portion of the sheet S protruding from the main body frame 36 is supported by the sheet bundle stacking unit 70. In this state, the sheet S is supported while spanning both the sheet stacking unit 35 and the sheet bundle stacking unit 70. In this way, not a configuration where the entire sheet S is received in the main body frame 36 but a configuration where the sheet S is supported while the front end portion of the sheet S protrudes from the main body frame 36 as described above has been employed in this exemplary embodiment. Accordingly, reduction is achieved in the size of the main body frame 36, and an area occupied by the entire image forming system 1 is further reduced.
Meanwhile, if the rotating plate 513 protrudes when binding processing is performed by the stapler 40, the movement of a sheet S or the movement of a sheet bundle T to be described below is regulated by the rotating plate 513. Further, there is a concern that the rotating plate 513 interferes with the sheet bundle stacking unit 70 being moved up. For this reason, when binding processing is performed by the stapler 40 in this exemplary embodiment, as shown in
Meanwhile, when sheets S are sequentially taken out onto the sheet stacking unit 35 by the exit rollers 34, the side portions of the sheets S are pushed by the tampers 38 (see
<Description of Binding Processing Performed by Binding Device>
Next, the binding processing, which is performed through the deformation of a sheet bundle T in the thickness direction by the binding device 500, will be described.
When binding processing is performed by the binding device 500, the sheet bundle stacking unit 70 is moved down to a position where the first and second binding units 510 and 520 do not interfere with the sheet bundle stacking unit 70. After that, as shown by an arrow A of
The protrusions TK (see
Here, when sheets S are sequentially conveyed toward the sheet stacking unit 35 by the exit rollers 34, the upper and lower frames 511 and 512 may be disposed on the conveying path of the sheet S. In this case, although a sheet S varies according to the size thereof, a sheet S conveyed by the exit rollers 34 is moved toward the end guide 35B (see
Meanwhile, the sheets S sequentially conveyed toward the sheet stacking unit 35 may be curled. If the curled sheet S enters the gap KG of the binding device 500, the sheet S may be caught by the lower surface of the upper frame 511 or the upper surface of the lower frame 512. For this reason, there is a concern that the conveyance of the sheet S toward the end guide 35B is regulated. In addition, the sheets S of a sheet bundle T may not be aligned.
Further, when a sheet S has already been stacked on the sheet stacking unit 35, a sheet S newly conveyed toward the sheet stacking unit 35 enters the gap KG of the binding device 500 after sliding on the upper surface of the sheet S having already been stacked on the sheet stacking unit 35 and the rotating plates 513. Even when a new sheet S slides on the sheet S having already been stacked as described above, the sheet S is apt to come into contact with the lower surface of the upper frame 511 in the gap KG. Furthermore, even in this case, the conveyance of the sheet S toward the end guide 35B is apt to be regulated.
When sheets S are sequentially conveyed toward the sheet stacking unit 35, the first and second binding units 510 and 520 including the upper and lower frames 511 and 512 are set to positions where the first and second binding units retract from the conveying path of a sheet S for this reason in this exemplary embodiment as described above. That is, the first binding unit 510 is made to retract to one side of the conveying path of a sheet S (one side in the direction orthogonal to the conveying path D), and the second binding unit 520 is made to retract to the other side of the conveying path of the sheet S.
Further, when a predetermined number of sheets S are supported as sheet bundles T while spanning both the sheet stacking unit 35 and the rotating plates 513 and the end portions of the sheet bundle T in the width direction and the conveying direction have been aligned, the sheet stacking unit 35 is moved toward the binding device 500. Accordingly, the front end portion of the sheet bundle T placed on the sheet stacking unit 35 is moved toward a position where the first and second binding units 510 and 520 perform binding processing. After that, the first and second binding units 510 and 520 are moved in a direction A orthogonal to the conveying path D of a sheet S (in the width direction of the sheet bundle T), and the first and second binding units 510 and 520 are set to a predetermined binding position in the direction A orthogonal to the conveying path D of a sheet S.
Meanwhile, although not described above, the rotating plates 513 of the first and second binding units 510 and 520 are formed in a triangular shape as shown in
Meanwhile,
The binding processing performed by the binding device 500 will continue to be described. When sheets S are taken out toward the sheet stacking unit 35, the side portions of the sheets S are pushed by the tampers 38 whenever the sheets S are taken out like as in the case of the binding processing performed by the stapler 40. Accordingly, the sheets S are aligned in the width direction of the sheet. Further, the sheets S are pushed against the end guide 35B by the paddle 37 to be rotationally driven, so that the sheets S are aligned in the conveying direction of the sheet. Accordingly, a sheet bundle T, of which the end portions in the width direction and the conveying direction have been aligned, is prepared on the sheet stacking unit 35. After that, the sheet stacking unit 35 slides along the conveying path D of a sheet S toward the binding device 500 (also see
After that, for example, when binding processing is performed at two positions in the middle of sheets S (the middle of sheets S in the direction orthogonal to the conveying path D of a sheet S), the first and second binding units 510 and 520 further approach each other in the direction A (see
Here, if the rotating plates 513 of the respective first and second binding units 510 and 520 are adapted not to be rotated, the rotating plates 513 of the respective first and second binding units 510 and 520 interfere with each other, so that the first and second binding units 510 and 520 are difficult to approach each other. For this reason, the rotating plates 513 of this exemplary embodiment are adapted to rotate and slide as described above. Accordingly, it may be possible to make the first and second binding units 510 and 520 approach a position where the first and second binding units can bind the middle portions of sheets S.
Subsequently, the first and second binding units 510 and 520 are further moved in a direction where the first and second binding units 510 and 520 approach each other (a direction of an arrow shown in
Meanwhile, the first and second binding units 510 and 520 include protruding members 512C that protrude from the upper surfaces of the lower frames 512 into the gap KG (also see
<Description of a Series of Operations when Binding Processing is Performed>
Next, there will be described a series of operations when the first and second binding units 510 and 520 perform binding processing in the case where the respective first and second binding units 510 and 520 are moved in the direction A (see
When the sheet stacking unit 35 slides, a sheet bundle T, which is supported by the sheet stacking unit 35 and the rotating plates 513, is moved toward a position where the first and second binding units 510 and 520 perform binding processing (a binding position in a direction of the conveying path D of a sheet bundle T). Further, when the sheet stacking unit 35 reaches a predetermined position that exists on the front side of the binding position on the conveying path D of a sheet bundle T (the upstream side on the conveying path D), the sheet stacking unit 35 stops the sheet bundle T. Furthermore, when the sheet bundle T is set to the predetermined position that exists on the upstream side of the binding position on the conveying path D, the respective first and second binding units 510 and 520 start to move in the direction A (see
Here, when a sheet bundle T is set to a predetermined position that exists on the upstream side of the binding position on the conveying path D, the ejection roller 39 is moved to a position where the ejection roller 39 comes into contact with the sheet bundle T while the rotation of the ejection roller 39 is stopped, and the ejection roller 39 clamps the sheet bundle T. Accordingly, the ejection roller 39 suppresses the deviation of the position of the sheet bundle T or the misalignment of the sheet bundle T during the movement of the first and second binding units 510 and 520 by pressing the sheet bundle T.
Further, the sheet reference member 511B, which is provided in the first binding unit 510, is set to a position that is separated from the front end portion of a sheet bundle T in the direction of the conveying path D (see
After that, when the first binding unit 510 reaches a predetermined binding position (a binding position in the direction A), the first binding unit 510 performs an operation for aligning the front end portion of a sheet bundle T (the front end portion of the sheet bundle corresponding to the front side on the conveying path D (see
While the end portion of the sheet reference member 511B comes into contact with the upper surface of the lower frame 512 as shown in
After that, as shown in
Further, as shown in
If an operation, which makes the front end portion of a sheet bundle T bump against the side surface of the sheet reference member 511B by the ejection roller 39, is repeated several times, the front end portions of the respective sheets S are aligned by the side surface of the sheet reference member 511B. As a result, the entire sheet bundle T is aligned. In particular, if an operation, which presses a sheet bundle T against the side surface of the sheet reference member 511B by the ejection roller 39, is repeated several times, the entire sheet bundle T is aligned with higher accuracy.
Meanwhile, an operation, which makes the front end portion of a sheet bundle T bump against the side surface of the sheet reference member 511B, may be performed only one time to shorten the time taken to align the front end portion of a sheet bundle T.
The ejection roller 39 is rotated as described above in the sheet processing apparatus 3 of this exemplary embodiment, so that the front end portion of a sheet bundle T, which has been stopped on the front side of a position where binding processing is performed (on the upstream side on the conveying path D), bumps against the side surface of the sheet reference member 511B and is pressed in a lateral direction (direction F4) of the sheet reference member 511B. Accordingly, the entire front end portion, which is to be bound, of the sheet bundle T is aligned. In this case, so as not to obstruct the conveyance of a sheet bundle T that is performed by the ejection roller 39, the sheet reference member 511B provided in the first binding unit 510 is disposed at a position where a sheet bundle T is not interposed (not pressed) between the sheet reference member 511B and the lower frame 512. Therefore, a sheet bundle T is smoothly moved toward the sheet reference member 511B by the ejection roller 39, so that alignment for aligning the front end portion of a sheet bundle T with high accuracy is performed.
Further, if an operation for pressing a sheet bundle T against the side surface of the sheet reference member 511B is repeated several times by the rotation of the ejection roller 39 in the normal and reverse directions, the entire sheet bundle T is aligned with higher accuracy.
Meanwhile, a position where the front end portion of a sheet bundle T bumps against the side surface of the sheet reference member 511B is a position where binding processing is performed by the first and second binding units 510 and 520 (a binding position in the direction of the conveying path D of a sheet bundle T). The position of the sheet reference member 511B is set in that way.
In this case, as the moving frame 511A is moved toward the lower frame 512 (in the direction F1), the protruding member 512C is pushed by the lower surface of the moving frame 511A and thus is received in the lower frame 512 (in a direction F5). That is, the protruding member 512C is adapted to be biased toward the upper frame 511 by a spring member (not shown). For this reason, when the moving frame 511A is moved to a position where the lower surface of the moving frame 511A comes into contact with the upper surface of the lower frame 512, the protruding member 512C is received in the lower frame 512 against the pushing force of a spring member (not shown). Accordingly, the obstruction of the pressing of a sheet bundle T, which is caused by the protruding member 512C, is suppressed and a sheet bundle T is stably fixed between the lower surface of the moving frame 511A and the upper surface of the lower frame 512.
After a sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the lower frame 512, the binding section 511C (the punching member 505 and the like) provided in the moving frame 511A is moved toward the lower frame 512 (in the direction F1) as shown in
In the sheet processing apparatus 3 of this exemplary embodiment, binding processing is performed on a sheet bundle T by the punching member 505 and the like of the binding section 511C while the sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the lower frame 512. Accordingly, a gap (floatation) is not easily formed between sheets S in a sheet bundle T. Therefore, a binding force of a sheet bundle T is increased in the binding processing that is performed by the binding section 511C for binding sheets S through the deformation of a sheet bundle T in the thickness direction. That is, if floatation exists between sheets S, the deformation of a sheet bundle in the thickness direction is reduced at a portion where floatation exists between sheets. Accordingly, a binding force is reduced as a whole and a sheet bundle T is apt to loosen. However, in this exemplary embodiment, a sheet bundle T is deformed in the thickness direction while the sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the lower frame 512 and floatation is reduced between the sheets S of the sheet bundle T. Accordingly, a portion, which is apt to loosen, is not easily formed at a bound sheet bundle T. As a result, the entire sheet bundle T is more strongly bound as one body, so that the loosening of the sheet bundle T is suppressed. In addition, even though the number of sheets S of a sheet bundle T is large, the sheet bundle T is hardly loosened. Further, since floatation is reduced in a sheet bundle T, the sheet bundle T is not easily loosened in the width direction of the sheet bundle T (the direction A (see
Further, as shown in
After that, the first binding unit 510 is moved toward the end portion of a sheet bundle T from the middle portion of a sheet bundle T in the direction A (see
A series of operations when the first binding unit 510 performs binding processing has been exemplified here, but the second binding unit 520 also performs the same operations.
Meanwhile, when the first and second binding units 510 and 520 are moved in a direction where the first and second binding units 510 and 520 are separated from each other, the rotating plates 513 of the respective first and second binding units 510 and 520 are pushed by the second coil springs KS2 and the end portions of the rotating plates 513 are pulled by the first coil springs KS1. Accordingly, the rotating plates 513 protrude from the lower frames 512 as shown in
After that, the same operations as the operations illustrated in
In this exemplary embodiment, the first and second binding units 510 and 520 are further moved in the direction where the first and second binding units 510 and 520 are separated from each other, after binding processing is completed at an end portion of a sheet bundle T. Accordingly, the rotating plates 513 of the respective first and second binding units 510 and 520 are pushed by the second coil springs KS2 and the end portions of the rotating plates 513 are pulled by the first coil springs KS1, so that the rotating plates 513 protrude from the lower frames 512. As a result, the first and second binding units 510 and 520 return to a set state shown in
That is, when binding processing has been completed, the first and second binding units 510 and 520 are disposed so that the rotating plates 513 are positioned below the sheet bundle T and the upper and lower frames 511 and 512 are positioned on the sides of the sheet bundle T (retract to the sides of the sheet bundle). In this exemplary embodiment, as described below, a sheet bundle T is conveyed by the ejection roller 39 after the completion of the binding processing performed by the binding device 500 and falls into the sheet bundle stacking unit 70 from an open portion that is formed at a lower portion of the device frame 530 (see
After that, the ejection roller 39 starts to rotate and takes out the sheet bundle T on which binding processing has been completed by the binding device 500. More specifically, the ejection roller 39 conveys the sheet bundle T until the rear end portion of the sheet bundle T passes through the opening 69 (see
The rotating plates 513 of this exemplary embodiment are inclined like the sheet stacking unit 35. For this reason, there is a concern that a sheet bundle T, which has been conveyed to the rotating plates 513 by the ejection roller 39, returns to the sheet stacking unit 35. Accordingly, a portion of the rotating plate 513, which is positioned on the upstream side in the conveying direction of a sheet bundle T, is further inclined as shown in
<Description of Stacking of a Sheet Bundle onto Sheet Bundle Stacking Unit>
After a sheet bundle T is conveyed to the rotating plates 513 by the ejection roller 39, the first and second binding units 510 and 520 are further moved in the direction where the first and second binding units 510 and 520 are separated from each other in the binding device 500 of this exemplary embodiment. When the first and second binding units 510 and 520 are further moved, the support of a sheet bundle T performed by the rotating plates 513 is released. Accordingly, the ejection roller 39 conveys a sheet bundle T toward the downstream side on the conveying path D, so that the sheet bundle T falls from the open portion that is formed at the lower portion of the device frame 530 (see
In the binding device 500 of this exemplary embodiment, the edges 513C (see
Furthermore, in the binding device 500 of this exemplary embodiment, the gap between the rotating plates 513 of the first and second binding units 510 and 520 becomes a minimum at a position where the apex 513B (see
Further, as the number of sheet bundles T stacked on the sheet bundle stacking unit 70 is increased, the sheet bundle stacking unit 70 is moved down. Although not described above, first and second sensors S1 and S2 for detecting a sheet bundle T placed on the sheet bundle stacking unit 70 are provided at the lower frames 512 as shown in
Each of the first and second sensors S1 and S2 is a transmission sensor, and includes a light emitting part (not shown) mounted on the lower frame 512 of the first binding unit 510 and a light receiving part (not shown) mounted on the lower frame 512 of the second binding unit 520. That is, the light emitting part of each of the first and second sensors S1 and S2 is provided at the lower frame 512 of the first binding unit 510, and the light receiving part of each of the first and second sensors S1 and S2 is provided at the lower frame 512 of the second binding unit 520.
Here, when binding processing is performed on a sheet bundle T, a convex portion is formed at the front or rear end portion of a sheet bundle T by a staple of the stapler 40, a tongue portion 522 (see
Meanwhile, it may be possible to detect a sheet bundle T stacked on the sheet bundle stacking unit 70 by not both the first and second sensors S1 and S2 but, for example, only the first sensor S1. However, in this case, there is a concern that the down movement of the sheet bundle stacking unit 70 is stopped even though the bulk of the front end portions of sheet bundles T is large. That is, there is a concern that the down movement of the sheet bundle stacking unit 70 is stopped even though the front end portion of a sheet bundle T interferes with the rotating plates 513. Further, it may be possible to detect a sheet bundle T stacked on the sheet bundle stacking unit 70 by, for example, only the second sensor S2. However, in this case, there is a concern that the down movement of the sheet bundle stacking unit 70 is stopped even though the bulk of the rear end portions of sheet bundles T is large. That is, there is a concern that the down movement of the sheet bundle stacking unit 70 is stopped even though the rear end portion of a sheet bundle T interferes with the rotating plates 513. For this reason, in this exemplary embodiment, two sensors, that is, the first sensor S1 for detecting the rear end portion of a sheet bundle T and the second sensor S2 for detecting the front end portion of a sheet bundle T are provided, and the sheet bundle stacking unit 70 is adapted to stop when a sheet bundle T is not detected by the first and second sensors S1 and S2.
<Description of Binding Section>
Next, the binding section 511C (see
As shown in
Further, the base 501 of the upper frame 511 is disposed parallel to a bottom member 502 that forms a frame body of the lower frame 512 facing the upper frame 511. Furthermore, a protruding portion 506, an opening portion 507, and an opening portion 508 are formed at the base 501 at a position that corresponds to the hole portion 512A (see
The blade 504 provided on the movable part 503 is formed of a rectangular plate-like member that includes a sharp end portion 504B at one end thereof. The blade 504 forms a slit-like (linear) cut portion at a sheet bundle T. That is, when the movable part 503 is moved toward the base 501, the blade 504 cuts the sheet bundle T in the shape of a slit as shown in
Further, the punching member 505 provided on the movable part 503 forms a tongue portion 522, which serves as an example of a cut-out piece (deformed portion) formed of a tongue-like cut portion, by cutting a sheet bundle T in the shape of a tongue.
As shown in
Furthermore, a sharp blade portion 505C is formed at a portion of the main part 505A opposite to the rotating shaft 505R, that is, at the edge of an end portion of the main part 505A facing the base 501. Accordingly, the main part 505A is swung so as to be inclined toward the blade 504 as shown in
Meanwhile, when the subsidiary part 505B is not pushed up by the protruding portion 506, the main part 505A is set to be substantially perpendicular to the lower frame 512. Further, a protrusion 505D, which protrudes toward the blade 504, is formed at the side portion of the main part 505A, specifically, at the side portion of the main part 505A facing the blade 504.
While a sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the bottom member 502 (the upper surface of the lower frame 512) as described above, the main part 505A shown in
When the subsidiary part 505B of the punching member 505 is further pushed up after the blade portion 505C of the main part 505A forms the tongue portion 522 at the sheet bundle T, the main part 505A is swung so as to be inclined toward the blade 504. Accordingly, the main part 505A bends the tongue portion 522 toward the slit opening 521 (the direction F2) as shown in
Accordingly, when the blade 504 is pulled up from the slit opening 521, the tongue portion 522 is inserted into the slit opening 521 as shown in
<Description of Operation of Binding Section>
Subsequently, the operation of the binding section 511C will be described in detail.
When binding processing starts to be performed in each of the first and second binding units 510 and 520, the movable part 503 is moved toward the base 501 by a cam driven by a motor (not shown) in the binding section 511C while a sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the bottom member 502 (the upper surface of the lower frame 512). Further, the blade 504, which is provided on the side of the movable part 503 facing the base 501 (the lower frame 512), reaches a sheet bundle T. Then, the blade 504 presses the sheet bundle T, so that a front end portion 504B of the blade 504 passes through the sheet bundle T. Accordingly, the binding section 511C forms a slit opening 521, which is a slit-like cut portion shown in
Moreover, the movable part 503 is moved so as to approach the base 501, so that the protruding portion 506 formed at the base 501 pushes up the subsidiary part 505B of the punching member 505. As the protruding portion 506 pushes up the subsidiary part 505B, the main part 505A of the punching member 505 is swung about the rotating shaft 505R as a center so as to be inclined toward the blade 504. Accordingly, the blade portion 505C of the main part 505A presses a sheet bundle T, so that the blade portion 505C passes through the sheet bundle T. Therefore, the binding section 511C forms the tongue portion 522, which is shown in
In this case, a region where the lower surface of the moving frame 511A and the upper surface of the lower frame 512 press a sheet bundle T is set so as to surround the blade 504 and the punching member 505 of the binding section 511C. Accordingly, the floatation of a sheet bundle T is more reliably suppressed.
Subsequently, when the movable part 503 is further moved toward the base 501, the main part 505A of the punching member 505 is further inclined toward the blade 504. Accordingly, as shown in
After that, while a sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the bottom member 502 (the upper surface of the lower frame 512), the movable part 503 is moved in a direction where the movable part 503 is separated from the lower frame 512, that is, the movable part 503 is moved up in the direction of an arrow F3 of
As described above, the tongue portion 522 is wound on the entire sheet bundle T while a sheet bundle T is pressed by the lower surface of the moving frame 511A and the upper surface of the bottom member 502 (the upper surface of the lower frame 512). Accordingly, a gap (floatation) between sheets S is hardly formed in a sheet bundle T, so that a portion, which is apt to loosen, is hardly formed at a sheet bundle T on which binding processing has been performed.
Further, a binding hole 523 is formed at a position where the tongue portion 522 is punched on a sheet bundle T on which binding processing has been completed (see
<Description of Movement Patterns of First and Second Binding Units>
Meanwhile, this exemplary embodiment employs a configuration where the first and second binding units 510 and 520 are disposed on both sides of a recording medium stacking member (the sheet stacking unit 35 and the rotating plates 513) in the direction A (see
Further, for example, when the respective first and second binding units 510 and 520 perform binding processing at two positions of the middle portion of a sheet bundle T and two positions closer to the end portions of the sheet bundle than the middle portion, that is, at a total of four positions, the first and second binding units 510 and 520 are moved to binding positions close to the middle portion of the sheet bundle T. Furthermore, the first and second binding units perform binding processing at the binding positions close to the middle portion. Then, the first and second binding units are moved from the binding positions, which are close to the middle portion, to binding positions that are closer to the end portions of the sheet bundle than the binding positions close to the middle portion, and perform binding processing at the binding positions close to the end portions. That is, when performing binding processing at plural binding positions, the respective first and second binding units 510 and 520 sequentially perform binding processing at the binding positions close to the middle portion and the binding positions close to the end portions in this order.
As described above, the respective first and second binding units 510 and 520 bind a middle portion of a sheet bundle T while pressing the middle portion of the sheet bundle T first by the lower surface of the moving frame 511A and the upper surface of the bottom member 502 (the upper surface of the lower frame 512). Then, the respective first and second binding units 510 and 520 bind the end portions (both end portions) of the sheet bundle T while pressing the end portions of the sheet bundle T similarly. For this reason, since a gap (floatation) between sheets S is hardly formed over the entire sheet bundle T in the width direction (the direction A (see
<Description of Positional Relationship Among Binding Section, Sheet Reference Member, Moving Frame>
Here, a positional relationship among the binding section 511C, the sheet reference member 511B, and the moving frame 511A will be described.
As shown in
Accordingly, the binding section 511C binds a sheet bundle T at a position where a front end portion Ta of the sheet bundle T to be bound is aligned by the sheet reference member 511B. Therefore, after being aligned, a front end portion Ta of a sheet bundle T is bound at least at a position where the binding section 511C binds a sheet bundle T. For this reason, even though sheets S are not aligned between binding positions (between the sheet reference members 511B of the respective first and second binding units 510 and 520) when binding processing is performed, the front end portion Ta of the sheet bundle T is aligned at the binding position. Accordingly, after binding processing is performed, misalignment of sheets S between binding positions is also corrected so as to correspond to the alignment at the binding position.
Further, downstream end portions 511Aa of the moving frame 511A in the direction of the conveying path D of a sheet bundle T may be positioned on the downstream side of the sheet reference member 511B in the direction of the conveying path D as shown in
Accordingly, when the moving frame 511A is moved toward the lower frame 512 and a sheet bundle T is interposed between the lower surface of the moving frame 511A and the upper surface of the lower frame 512 so that floatation of the sheet bundle T is pressed (see
<Description of Another Configuration of Sheet Reference Member>
In each of the first and second binding units 510 and 520 of this exemplary embodiment, the sheet reference member 511B has been adapted to approach and separate from the upper surface of the lower frame 512. A configuration where the sheet reference member 511B is fixed to the upper surface of the lower frame 512 may be employed other than this configuration.
Even in this configuration, the sheet reference member 511B is set to a position that is separated from the front end portion of a sheet bundle T in the direction of the conveying path D (see
However, if the configuration where the above-mentioned sheet reference member 511B approaches and separates from the upper surface of the lower frame 512 is employed, it may be possible to immediately convey a sheet bundle T to the downstream side on the conveying path D by the ejection roller 39 by making the sheet reference member 511B retract to a position that is separated from the upper surface of the lower frame 512. For this reason, it may be possible to start to convey a sheet bundle T by the ejection roller 39 before the first and second binding units 510 and 520 start to move in the direction where the first and second binding units 510 and 520 are separated from each other (the direction orthogonal to the conveying path D) or at the same time with the start of the movement of the first and second binding units. Accordingly, it may be possible to more quickly start to convey a sheet bundle T to the open portion that is formed at the lower portion of the device frame 530 (see
<Description of Another Configuration of Binding Section>
Meanwhile, the binding section 511C of each of the above-mentioned first and second binding units 510 and 520 has been adapted to perform binding processing by inserting the tongue portion 522 into the slit opening 521. Other than this configuration, a method, which presses the respective sheets S of a sheet bundle T against each other, may be used as a binding mechanism for deforming a sheet bundle T, which is used in each of the first and second binding units 510 and 520, in the thickness direction.
As shown in
When a sheet bundle T is pressed by the upper and lower press frames 611 and 612 in this configuration, the upper surface-press tooth portion 613 meshes with the lower surface-press tooth portion 614. As a result, as shown in
<Description of Another Configuration of First and Second Binding Units>
Further, the first and second binding units 510 and 520, which have been described above, may have the following configuration.
In this exemplary embodiment, the first binding unit 510 is adapted so that an upper surface 512Y of a lower frame 512 and an upper surface of a rotating plate 513 have the same height in a height direction. In more detail, a stepped portion is formed on the upper surface of the lower frame 512, and a support surface 512N, which is positioned below the upper surface 512Y and supports the rotating plate 513 from below, is formed on the lower frame 512. Further, in this exemplary embodiment, the rotating plate 513 is placed on the support surface 512N. Furthermore, in this exemplary embodiment, the thickness of the rotating plate 513 is set so that the upper surface 512Y and the upper surface of the rotating plate 513 have the same height. Here, in the case of the configuration of this exemplary embodiment, a sheet bundle T enters the gap KG (see
Meanwhile, a groove 512K, which guides a protrusion TK formed on the lower surface of the rotating plate 513, is formed on the support surface 512N. Further, in this exemplary embodiment, a second regulating part 402 for regulating the rotation of the rotating plate 513 is formed in the groove 512K. Furthermore, in this exemplary embodiment, a protruding portion 513E protrudes downward from the lower surface of the rotating plate 513, and an end portion of a first coil spring KS1 is mounted on the protruding portion 513E. Moreover, in this exemplary embodiment, a notch 512M for the avoidance of interference between the protruding portion 513E and the lower frame 512 is formed at the lower frame 512. Further, a notch 512P for the avoidance of interference between a shaft 512D and the lower frame 512 is formed at the lower frame 512.
As described above, in the sheet processing apparatus 3 of this exemplary embodiment, a sheet bundle T is stopped on the front side of a position where binding processing is performed (on the upstream side of a position, where binding processing is performed, on the conveying path D), and the front end portion of the stopped sheet bundle T bumps against the side surface of the sheet reference member 511B and is pressed in the lateral direction (the direction F4) of the sheet reference member 511B by the rotation of the ejection roller 39. Accordingly, the entire front end portion of the sheet bundle T to be bound is aligned. Further, in this case, the sheet reference member 511B provided in the first binding unit 510 is disposed at a position where a sheet bundle T is not interposed (not pressed) between the sheet reference member 511B and the lower frame 512. Therefore, a sheet bundle T is smoothly moved toward the sheet reference member 511B by the ejection roller 39, so that alignment for aligning the front end portion of a sheet bundle T with high accuracy is performed. In addition, if an operation for pressing a sheet bundle T against the side surface of the sheet reference member 511B is repeated several times by the rotation of the ejection roller 39 in the normal and reverse directions, the entire sheet bundle T is aligned with higher accuracy.
The foregoing description of the exemplary embodiments of the invention has been provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2010-186021 | Aug 2010 | JP | national |
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| 5580039 | Takehara et al. | Dec 1996 | A |
| 6641129 | Ogita et al. | Nov 2003 | B2 |
| 7284752 | Nagata et al. | Oct 2007 | B2 |
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| 20090065999 | Iguchi et al. | Mar 2009 | A1 |
| Number | Date | Country |
|---|---|---|
| 2004-277036 | Oct 2004 | JP |
| 2008-110468 | May 2008 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20120045295 A1 | Feb 2012 | US |
