JP2015030596A - Paper post-processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high aligning quality even if paper is thin.SOLUTION: A paper post-processing device includes a stitching means for stitching one end of a paper bundle where an image is formed, and a stacking means for stacking the paper having been stitched by the stitching means. The stacking means includes a staple tray where the paper on which an image has been formed slides down a slope as far as a reference fence, a correction means which corrects skew of an end face parallel to the transportation direction of the paper by an alignment component in the staple tray before being stitched by the stitching means, and an adjusting means for adjusting an angle of the alignment component relative to the staple tray.

Description

  The present invention relates to a sheet post-processing apparatus that is provided in a copying machine or the like and performs alignment of discharged sheet bundles and binding of sheet bundles.

  2. Description of the Related Art Conventionally, a sheet post-processing apparatus that is installed downstream of a copying machine or the like and performs sheet alignment and binding processing, as described in Patent Document 1, has a staple tray surface that performs sheet alignment at an angle close to vertical. Had.

On the other hand, due to recent market needs, there is a demand for an expansion of the required range for the thickness of paper. In particular, because of the advantages in terms of resource saving and cost, there is a high need for thin paper, and there is a demand for adaptability as a paper post-processing device, but thin paper is weak in the rigidity of the paper itself, It is very difficult to secure alignment accuracy as alignment quality in the paper post-processing apparatus.
In the paper post-processing apparatus as described in Patent Document 1, since the staple tray is in a nearly vertical state as described above, if the paper made of thin paper is to be aligned, the paper itself is taken into account because of the weak rigidity of the thin paper. Can't stand the weight of For this reason, the paper is buckled in the paper post-processing apparatus, and the alignment accuracy as the required alignment quality cannot be ensured for the thin paper.

  Therefore, an object of the present invention is to obtain high alignment quality even if the paper is thin.

  In order to solve the above-described problem, the invention according to claim 1 is directed to a rear side of paper having binding means for binding one end of a bundle of sheets on which images are formed, and stacking means for stacking sheets bound by the binding means. In the processing apparatus, the stacking unit includes a staple tray on which the sheet on which the image is formed slides down to a reference fence, and a bending of an end surface parallel to the conveyance direction of the sheet on the staple tray before being bound by the binding unit. And a adjusting means for adjusting the angle of the aligning part with respect to the staple tray.

  According to the present invention, high alignment quality can be obtained even if the paper is thin.

1 is a conceptual diagram of a sheet post-processing apparatus according to an embodiment. FIG. 2 is a partially enlarged view of the sheet post-processing apparatus illustrated in FIG. 1. (a), (b), (c) is explanatory drawing of the problem in the paper post-processing apparatus shown in FIG. (a)-(d) is explanatory drawing for demonstrating Example 1. FIG. (a)-(d) is explanatory drawing for demonstrating the modification 1. FIG. (a)-(d) is explanatory drawing for demonstrating the modification 2. FIG. (a)-(d) is explanatory drawing for demonstrating the modification 3. FIG. (a)-(c), It is explanatory drawing about Example 2. FIG. (a), (b) is explanatory drawing about Example 2. FIG. (a), (b) is explanatory drawing about the modification 5. FIG. (a)-(c) is explanatory drawing for demonstrating Example 3. FIG. (a), (b) is explanatory drawing for demonstrating Example 4. FIG.

Next, embodiments will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 is a conceptual diagram of a sheet post-processing apparatus according to an embodiment. FIG. 2 is a partially enlarged view of the sheet post-processing apparatus shown in FIG. 3A, 3B, and 3C are explanatory diagrams of problems in the sheet post-processing apparatus shown in FIG.
[Constitution]
The paper post-processing apparatus shown in FIG. 1 is disposed in the vicinity of the transport roller 6, the path switching claw 7, the stacking means, the pair of alignment parts 3, the reference fence 2 disposed at the lower end of the staple tray 1, and the reference fence 2. A binding means 4 is provided.
The binding means 4 has a function of binding one end of a bundle of sheets on which images are formed with a known staple (not shown).
The stacking unit has a staple tray 1 and stacks sheets before and after the binding process.
The aligning component 3 as a component of the correcting means is configured such that at least a part of the aligning component 3 is inclined or the staple tray is bent by an adjusting device described later.

The adjusting means includes a pair of L-shaped cross-sectional alignment parts 3 arranged along the conveying direction on both sides of the staple tray 1, and an inclination mechanism for inclining the entire alignment part 3 toward the sheet. Also good.
The adjusting means includes a pair of L-shaped cross-sectional alignment parts 3 arranged along the conveyance direction on both sides of the staple tray 1, and an inclination mechanism that inclines a part of the alignment parts 3 toward the sheet. May be.
The adjusting means includes an alignment component 3 having an L-shaped cross section disposed on both sides of the staple tray 1, a plurality of rotation fulcrums provided along the longitudinal direction of the staple tray 1, and a central rotation fulcrum among the plurality of rotation fulcrums. And a push-up mechanism that pushes up the paper together.
The adjusting means includes a pair of aligning parts 3 arranged along the conveying direction on both sides of the staple tray 1, a folding mechanism that bends the staple tray 1 for each sheet at a predetermined angle on the sheet discharge side when the sheets are aligned, May be provided.

  The paper post-processing apparatus has a shape in which the inclination angle of the staple tray surface on which the paper slides down the slope to the reference fence 2 is tilted in a direction close to the horizontal with respect to the conventional apparatus. This inclination improves the ability to handle thin paper with low rigidity. Further, the length of the staple tray 1 is set to be short so that the size of the sheet post-processing apparatus is not made larger than that of the conventional sheet post-processing apparatus by reducing the inclination angle of the staple tray surface. Here, since the staple tray 1 is shorter than the conventional paper post-processing apparatus, it is often called a half tray method.

However, as shown in FIG. 2, in the case of the half-tray method, the sheet 40 discharged from the image forming apparatus side to the staple tray 1 slides near the center of the staple tray 1 that is inclined. Therefore, as shown in FIGS. 3 (a) to 3 (c), when the side fence such as a jogger as the alignment component 3 has a square bracket ([]) cross-sectional shape as shown in FIGS. Paper 40 gets on top of it.
Therefore, it is necessary to eliminate the running of the paper 40 by forming the jogger with the L-shaped cross-sectional shape. However, when the jogger is formed with the L-shaped cross-sectional shape, the side face curl cannot be corrected and the alignment accuracy is deteriorated. I will let you. For this reason, a means for avoiding this conflicting state is necessary.

  The present invention makes it possible to adjust an angle formed by a tray that is a surface on which a sheet slides and a jogger as an alignment component that is a component of the correction means. This makes it possible to correct the side face curl even in a half tray method in which a side fence such as a jogger cannot have a square bracket shape.

[Operation]
Hereinafter, the operation of the sheet post-processing apparatus will be described.
The paper 40 received from the image forming apparatus is discharged on the staple tray 1 which is an inclined surface through the conveyance path.
The sheet 40 received from the image forming apparatus side is discharged onto the staple tray 1 through the conveyance path. The paper 40 discharged to the staple tray 1 is transported by the return roller 5, aligned by the reference fence 2 in the paper transport direction and the alignment component 3 in the paper width direction, and is bound by the binding means 4.

Example 1 will be described with reference to FIGS.
4A to 4D are explanatory diagrams for explaining the first embodiment.
4 (a) is a front view of the vicinity of the correction means in the standby state, FIG. 4 (b) is a side view of FIG. 4 (a), and FIG. 4 (c) is the vicinity of the correction means in the operating state. 4 (d) is a side view of FIG. 4 (c).

The correction means includes an alignment component 3 rotatably connected to a moving component 15 that passes the moving shaft 10, an angle correction component 11 that contacts the alignment component 3, an eccentric cam 13 that changes the angle of the angle correction component 11, Have The correction means includes a configuration in which the eccentric cam 13 rotates around the cam shaft 12 and the angle correction component 11 tilts around the rotation shaft 16 so that the alignment component 3 in contact with the angle correction component 11 tilts. Become. With this configuration, the angle θ between the alignment component 3 and the staple tray surface 1a can be freely changed. When the alignment component 3 is inclined, the sheet pressing surface 3aa of the alignment component 3 can press the end surface of the side face curl sheet 40.
4A to 4D, the angle correction component 11, the cam shaft 12, the eccentric cam 13, the holding component 14, and the rotation shaft 16 constitute an inclination mechanism.
The aligning part 3 and the tilt mechanism constitute an adjusting means.
The angle correction component 11, the cam shaft 12, and the eccentric cam 13 constitute an inclination mechanism.

  Although not shown in FIG. 4, the cam shaft 12 is rotated by a motor, a gear or the like. 10 is a feed screw as a moving shaft, and 15 is a nut or ball screw as a moving part. The alignment component 3 is fixed to the holding component 14 and is connected to the moving component 15 via the rotation shaft 16. For example, the angle correction component 11 is rotatable about a rotation shaft 11a and may be biased by a spring 11b. As a result, stable operation of the matching component 3 can be obtained.

<Modification 1>
A first modification of the first embodiment will be described with reference to FIGS.
5A to 5D are explanatory diagrams for explaining the first modification.
5A is a front view of the vicinity of the correction means in the standby state, FIG. 5B is a side view of FIG. 5A, and FIG. 5C is the vicinity of the correction means in the operating state. FIG. 5 (d) is a side view of FIG. 5 (c).

  The correction means includes a moving part 15 that passes the moving shaft 10, an alignment part 3 that is rotatably connected to the moving part 15 via a holding part 14 and a rotating shaft 16, and an angle correction part that contacts the aligning part 3. 11 and a rotation component 20 that changes the angle of the angle correction component 11. As the rotary component 20 rotates and the angle correction component 11 moves, the alignment component 3 in contact with the angle correction component 11 is inclined. With this configuration, the angle θ between the alignment component 3 and the staple tray surface 1a can be freely changed. The rotating component 20 can be rotated by a geared motor or a gear (not shown).

  Here, in FIG. 4, the angle of the angle correction component 11 is changed with respect to the end face of the side face curl paper 40. How the warp of the end face of the side face curl paper 40 is detected and how the angle of the alignment component 3 is determined with respect to the warp will be described.

  If the side face curl is large, the paper width, that is, the width of the projected area becomes small. Therefore, a detecting means such as a reflection sensor is installed on the transport path to detect the “apparent paper width”, and the jogger is matched to that width. The angle can be determined. The angle of the jogger may be calculated from the sheet edge height. Alternatively, the curl amount of the paper 40 may be directly measured, and the angle may be determined by SP adjustment or the like according to the value.

<Modification 2>
A second modification of the first embodiment will be described with reference to FIGS.
6 (a) to 6 (d) are explanatory diagrams for explaining the second modification.
6 (a) is a front view of the vicinity of the correction means in the standby state, FIG. 6 (b) is a side view of FIG. 6 (a), and FIG. 6 (c) is the vicinity of the correction means in the operating state. 6 (d) is a side view of FIG. 6 (c).

The correction means includes a moving part 15 that passes the moving shaft 10, an aligning part 33 having a cam receiving surface 32a connected to the moving part 15 by the rotating shaft 16, an eccentric cam 31 that contacts the aligning part 33, and an eccentric cam. And a cam shaft 30 for rotating 31.
Although not shown in the figure, the camshaft 30 is rotated by a motor or the like. When the eccentric cam 31 is rotated by the cam shaft 30, the eccentric cam 31 comes into contact with the inclined cam receiving surface 32a of the alignment component 33, and the alignment component 33 rotates with the rotation shaft 30 as a fulcrum. . With this configuration, the angle θ between the alignment component 33 and the staple tray surface 1a can be changed.

<Modification 3>
A third modification of the first embodiment will be described with reference to FIGS.
7A to 7D are explanatory diagrams for explaining the third modification.
7 (a) is a front view of the vicinity of the correction means in the standby state, FIG. 7 (b) is a side view of FIG. 7 (a), and FIG. 7 (c) is the vicinity of the correction means in the operating state. 7 (d) is a side view of FIG. 7 (c).

  The correction means includes a moving part 15 that passes the moving shaft 10, an alignment part 43 having a protrusion 43a that is connected to the moving part 15 by the rotating shaft 16, a protrusion part 42 that contacts the alignment part 43, and a protrusion part 42. And a shaft 41 for moving. Although not shown in the figure, the shaft 41 is moved left and right by a motor or the like. When the protruding component 42 is moved by the shaft 41, the protruding component 42 comes into contact with the protruding portion 43a of the alignment component 43, and the alignment component 43 is inclined with the rotating shaft 16 as a fulcrum. The shaft 41 may be a feed screw, and may be integrated with the protruding component 42 and a nut or ball screw.

  Further, in the case of this configuration, the alignment component 43 may be configured to contact the protrusion component 42 and rotate by moving toward the center even if the position of the protrusion component 42 does not move. With this configuration, the angle θ between the alignment component 43 and the staple tray surface 1a can be changed.

  Here, in the embodiment and the modification shown in FIGS. 4 to 7, a part of the correcting means is inclined toward the paper side. On the other hand, in the embodiment shown in FIGS. 8 to 10, the entire correction means is inclined toward the paper side.

The problem to be solved by the present invention will be described below with reference to FIGS. 3 (a), (b), and (c).
The end of the paper 40 discharged from the image forming apparatus main body may be curved into various shapes depending on conditions such as paper quality and the environment. The accuracy will be greatly affected. In particular, for the bending of the end face parallel to the conveyance direction of the paper 40, even if the alignment operation in the paper width direction is performed by the alignment component, the sheet 40 is bent, so the edge of the sheet gets over the alignment component. For this reason, it is sometimes impossible to maintain alignment quality, particularly alignment accuracy.

  In view of the above, an object of the present invention is to improve the alignment accuracy as a high alignment quality with respect to the bending of the sheet edge by changing the angle at which the alignment component and the staple tray surface 1a are formed. .

Example 2 will be described.
Embodiment 2 and Modification 4 will be described with reference to FIGS. 8 (a), (b), and (c) to FIGS. 10 (a) and 10 (b).
FIGS. 8A to 8C, FIGS. 9A and 9B are explanatory diagrams for the second embodiment, and FIGS. 10A and 10B are explanatory diagrams for the fifth modification. .

As shown in FIG. 8A, the aligning part 3 is divided into two parts, an aligning part 3a and an aligning part slide part 3b, and the aligning part 3a is rotatably attached to the slide part 3b. The surface 1a is configured to be able to change the angle θ1 of the matching portion 3a.
When aligning the sheet 40 on the staple tray surface 1a, the slide part 3b of the aligning component 3 is moved in parallel by a drive source (not shown) in order to align the sheet width direction. At this time, the angle θ1 between the staple tray surface 1a and the aligning portion 3a is simultaneously changed, and the angle θ2 between the tangent to the bending of the sheet 40 and the aligning portion 3a is vertical by changing to the state θ3 shown in FIG. The force is appropriately applied to the paper 40. As a result, it is possible to prevent the sheet 40 from being bent at the time of alignment and the end portion of the sheet 40 from rising up the alignment portion 3a of the alignment component 3. After the alignment of the paper 40 is completed, as shown in FIG. 8 (c), the alignment component 3 is excessive with respect to the aligned paper 40 by returning the angle θ3 between the staple tray surface 1a and the alignment portion (3a) to θ1. Do not crush.

  Here, in FIG. 8C, the alignment portion 3a is inclined at an acute angle from 90 °. However, the angle θ3 at which the alignment component 3a contacts the paper 40 is detected from the width or height of the paper 40 by the jogger. The angle of the matching part can be set.

FIGS. 9A, 9B, 10A, and 10B are diagrams illustrating a configuration example for making the matching portion 3a variable.
The alignment portion 3a of the alignment component 3 is rotatably connected to the slide portion 3b by a shaft, and the alignment portion 3a is connected to the slide component 50 by a link component 80. The slide component 50 is fixed to the belt 8, and when the drive source 100 is driven to rotate, the slide component 50 moves in the horizontal direction. When the slide part 50 is moved without moving the slide part 3b of the alignment part 3, the link part 80 rotates around the alignment part 3a as shown in FIGS. The position of 3a changes. As a result, the angle θ4 between the staple tray surface 1a and the alignment portion 3a changes to the angle θ5.

  As shown in FIG. 10 (a), the moving speed of the slide component 50 by the drive source 100 so as to keep the horizontal distance X between the alignment portion 3a and the link component 80 constant, and the alignment component moved by the drive source (not shown). It is conceivable to make the moving speeds of the three slide portions 3b the same. As a result, the alignment component 3 is moved in parallel while maintaining the angle between the staple tray surface 1a and the alignment portion 3a, and the horizontal distance between the alignment portion 3a and the link component 80 is set by providing a difference in the moving speed of the two drive sources. X spreads. Alternatively, if it is narrowed, the aligning component 3 can be moved while changing the angle between the staple tray surface 1a and the aligning portion 3a.

A third embodiment will be described with reference to FIGS.
FIGS. 11A to 11C are explanatory views for explaining the third embodiment.
At least one surface of the staple tray surface 1a is rotated by a plurality of rotation fulcrums with respect to an angle θ in the paper transport direction formed from the alignment component 3 and the staple tray surface 1a.
Reference numerals 60a, 60b, and 60c denote coupling portions as rotation fulcrums for making the staple tray 1 bend along the longitudinal direction. 4 pieces of parts are connected.

On the opposite side of the paper stacking surface of the staple tray surface 1a, there is an eccentric cam 70 attached to a cam shaft 50 as a drive shaft that transmits drive from a drive source (not shown), and by rotating the cam shaft 50, The eccentric cam 70 is configured to lift the rotation surfaces 1a and 1b of the staple tray 1. By this operation, the angle θ in the sheet conveyance direction formed from the alignment component 3 and the staple tray surface 1a can be varied from θ1 to θ2.
The cam shaft 50 and the eccentric cam 70 constitute a push-up mechanism.
The cam shaft 50, the eccentric cam 70, and the rotation fulcrums 60a, 60b, 60c constitute a bending mechanism.

Furthermore, by using a stepping motor as a drive source, the stop position of the eccentric cam 70 can be selectively adjusted by pulse control. For this reason, the value of θ2 can be operated in an optimum state in accordance with different paper types, paper stacking conditions, paper edge bends, and the like. Instead of the stepping motor, a DC motor may be used as long as the position can be controlled by an encoder or the like.
By rotating the staple tray 1 and lifting a part of the paper 40 stacked on the tray, the edge of the paper is lowered as shown in FIG. As a result, even if the aligning operation is performed in the sheet width direction using the alignment component, it is possible to suppress problems such as the sheet 40 being bent and the end of the sheet getting over the alignment component.

Embodiment 4 will be described with reference to FIGS. 12 (a) and 12 (b).
12A and 12B are explanatory diagrams for explaining the fourth embodiment.
The staple tray 100 is divided into two parts, the stapler 4 and the staple tray 100b on the reference fence 2 side are fixed, and the part 100a on the discharge side can be freely changed in angle around the hinge 101. ing. For example, the divided staple trays 100a and 100b can be rotated by being fixed by a shaft or the like. By arranging the cam shaft 50 and the eccentric cam 70 below the divided staple tray 100a, the angle θ is determined by the position of the eccentric cam 70. Further, the cam shaft 50 is rotated by a motor or the like not shown in the drawing.
With this configuration, the angle θ of the staple tray 100a in the transport direction can be freely changed by changing the shape of the eccentric cam 70.
The material of the staple tray 100 may be either flexible resin or metal.
If the paper 40 is a side face curl, the end of the paper 40 remains a side face curl in the state shown in FIG. However, when the state shown in FIG. 12B is reached, the paper 40 is folded along the staple tray 100, whereby the paper width is stiff and the side face curl is eliminated.

Here, the difference between the embodiment shown in FIGS. 12A and 12B and the embodiment shown in FIG. 2 will be described.
The purpose of the paper discharge roller is to discharge the paper 40, but the discharge means is one that discharges only with the discharge claw of the reference fence 2, one that discharges only with the paper discharge roller, and both the discharge claw and the paper discharge roller. There are three types of releases.
In the configuration of FIG. 12, since the discharge roller may become an obstacle in order to bend the leading end of the staple tray 100, it is necessary to dispose the discharge roller at a position away from the leading end of the paper 40. Therefore, it is omitted in FIG.
In FIG. 12, the leading end of the staple tray 100 is buckled to align the paper 40, and after the binding process, the bending of the leading end of the staple tray 100 is restored. The paper 40 can be lifted up to a position where it is nipped by a paper discharge roller (not shown) by the discharge claw of the reference fence 2 and finally discharged by the paper discharge roller.

<Effect>
According to the present embodiment, it is possible to adjust the angle formed by the tray that is the surface on which the paper slides down and the jogger as the alignment component that is a component of the correction means. As a result, it is possible to correct the bending of both end surfaces in the transport direction of the sheet discharged onto the tray, that is, both side surfaces.

  According to the present embodiment, the alignment component that presses the end surface in the paper width direction rotates and has a mechanism that can adjust the angle of the alignment component with the staple tray surface. The angle of the aligning parts can be changed according to the bend, and the sheets can be aligned.

  According to the present embodiment, the sheet post-processing apparatus has a mechanism capable of variably adjusting the angle of the alignment component, so that the alignment component is brought into contact with the bending of the sheet edge at an appropriate angle. be able to. Further, by preventing the sheet from bending and the sheet end from getting over the alignment component, it is possible to improve the alignment accuracy and to prevent stapling.

  This is because, when the side face curled paper passes over the jogger as an alignment part, the sheets cannot be aligned, and as a result, binding may occur. Since the present invention can prepare side face curled paper, it is a measure for preventing binding failure.

  According to the present embodiment, the staple tray surface is rotated, and the edge of the sheet is lowered by lifting a part of the sheet stacked on the tray, so that it is possible to prevent the alignment component from getting over. become. As a result, the alignment system as the alignment quality of the apparatus can be improved.

  According to the present embodiment, the sheet post-processing apparatus has a mechanism capable of adjusting the angle in the sheet conveyance direction by rotating the surface on which the sheet slides. As a result, the stacked sheets are refracted and become stiff so that they can be aligned by the jogger without being affected by the curl of the sheets.

The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. is there.
For example, in the above description, the case where the sheet post-processing apparatus is the staple tray + jogger has been described. However, the present invention is not limited to this, and the present invention can also be applied to the case of the shift tray + alignment unit.

DESCRIPTION OF SYMBOLS 1 Staple tray 1a Staple tray surface 2 Reference fence 3, 33, 43 Alignment part 3a Alignment part 3b Slide part 3aa Paper pressing surface 4 Binding means 5 Return roller 6 Conveyance roller 7 Path switching claw 8 Belt 10 Moving shaft 11 Angle correction part 11a Rotating shaft 11b Spring 12, 50 Cam shaft 13, 70 Eccentric cam 14 Holding component 15 Moving component 16, 30 Rotating shaft 20 Rotating component 40 Paper 41 Axis 42 Protruding component 43a Protruding portion 60a, 60b, 60c Connecting portion 80 Link component 100 Driving source

JP 2002-321868 A

Claims (5)

In a sheet post-processing apparatus having a binding unit that binds one end of a bundle of sheets on which an image is formed, and a stacking unit that stacks sheets bound by the binding unit.
The loading means is
A staple tray on which the imaged paper slides down the slope to the reference fence;
Correction means for correcting the bending of the end face parallel to the paper transport direction in the staple tray with the alignment component before being bound by the binding means;
And a paper post-processing apparatus, comprising: an adjusting unit configured to adjust an angle of the alignment component with respect to the staple tray. The adjusting means according to claim 1 comprises:
A pair of L-shaped cross-sectional alignment parts disposed along the conveying direction on both sides of the staple tray;
A sheet post-processing apparatus, comprising: a tilt mechanism that tilts the entire alignment component toward the sheet. The adjusting means according to claim 1 comprises:
A pair of L-shaped cross-sectional alignment parts disposed along the conveying direction on both sides of the staple tray;
A sheet post-processing apparatus, comprising: a tilt mechanism that tilts a part of the alignment component toward the sheet. The adjusting means according to claim 1 comprises:
A pair of L-shaped cross-sectional alignment parts disposed along the conveying direction on both sides of the staple tray;
A plurality of fulcrums provided along the longitudinal direction of the staple tray to bend the staple tray;
A push-up mechanism that pushes up the sheet together with a central rotation fulcrum among the plurality of rotation fulcrums;
A sheet post-processing apparatus comprising: The adjusting means according to claim 1 comprises:
A pair of alignment parts disposed along the conveying direction on both sides of the staple tray;
A paper post-processing apparatus, comprising: a folding mechanism that bends the staple tray together with the paper at a predetermined angle on the paper discharge side when the paper is aligned.

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