JPH10181993A - Sheet loading device and sheet after processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution whereby when a vessel receiving a plurality of sheets is rapidly moved, a plurality of the sheets loaded on the vessel to be pressed by sheet pressing means are accurately perform paper alignment without generating end face displacement, and in a sheet after processor, sheet arrangement is surely executed, a binding lock can be made in a fixed position. SOLUTION: This sheet loading device comprises a vessel 51 receiving a plurality of sheets, sheet pressing means press holding the sheet P loaded on the vessel 51, and movement means moving the vessel 51 in a condition pressing the sheet. Here, a friction coefficient μ1 of a surface into contact with the sheet P of a sheet press member 55 of the sheet pressing means is formed almost equal to a friction coefficient μ2 between the sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a printing machine, or a printer, which includes a plurality of bins for separating and storing sheets discharged from the image forming apparatus. The present invention relates to a sheet post-processing apparatus including a stapler apparatus for aligning and binding sheets stored in a sheet.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 2, a sheet post-processing apparatus is combined with an image forming apparatus 100 or the like, and
0, the recording sheet P discharged from the sheet post-processing apparatus 1
The sheet is sequentially conveyed and accommodated in a number of bins 51 provided in the sheet post-processing apparatus 10 by a conveying means and a switching gate provided in the conveying unit 11 in the unit 0, and sorted into a designated number.

In a fixed bin type sheet post-processing apparatus, a method of distributing recording sheets P to each bin includes a method of distributing recording sheets P to each bin by switching a switching gate, and a method of distributing recording sheets P to each bin by a distributor (indexer). There are two methods of distributing the recording sheets P to the bins, and the method using the distributor is superior in terms of cost and has recently become the mainstream. Bins 51a to 51n (hereinafter, referred to as bin 51)
Is provided with a stapler device 70 that moves up and down the sides of the stapler.

As disclosed in Japanese Patent Application Laid-Open No. 6-87564, a stapler that disperses recording sheets P to the respective bins 51 using the distributor and then moves up and down along the side of the bins arranged vertically. There is known a method in which an apparatus 70 is provided and the bins 51 are slid in the horizontal direction to bind the stacked recording sheets P.

[0005]

As described above, in the system in which the stapler device 70 moves only up and down and slides the bin 51, a plurality of recording sheets P stacked on the bin 51 are disturbed by the sliding action. However, there are problems such as irregularities.

When the bin 51 is moved in the sliding manner as described above, a large number of recording sheets P are already ejected and accumulated on the bin 51, and the bin 51 generally has the largest recording sheet P. However, it is formed larger than the maximum size A3 size so that it can be discharged and accumulated smoothly. Therefore, as a recording sheet P generally used, for example, a small-sized B5 size or A4 size recording sheet is discharged to a part of the bin 51. In order to bind a large number of recording sheets discharged in this way with a stapler, the recording sheets are aligned to one side of the bin 51 using a paper alignment member, and the paper alignment member is moved with the movement of the bin 51. If this is done, the mechanism becomes complicated mechanically, and the sheet post-processing apparatus becomes large. Accordingly, the accumulated recording sheets are separated from the paper aligning member with the movement of the bin 51, and the aligned recording sheets are moved or disturbed on the bin 51, and the binding operation is performed by the stapler device. Sometimes, there is a problem that a good binding operation cannot be performed.
In particular, when post-processing such as stapling and punching is performed after the sheet alignment, the irregularity of the sheet becomes a defect.

An object of the present invention is to prevent recording sheets stacked on the bin 51 from moving or being disturbed when the bin 51 is moved to the stapler apparatus.

[0008]

According to a first aspect of the present invention, there is provided a sheet stacking apparatus for holding a plurality of sheets and pressing a sheet stacked on the container. In a sheet stacking apparatus comprising a sheet pressing means for holding and a moving means for moving the container while pressing the sheet, a coefficient of friction μ1 of a surface of the sheet pressing means where the sheet pressing member comes into contact with the sheet is determined between the sheets. Is formed substantially equal to the friction coefficient μ2.

According to another aspect of the present invention, there is provided a sheet post-processing apparatus comprising: a plurality of vertically stacked bins for distributing and storing recording sheets carried out from an image forming apparatus main body; Moving means for moving the bin in a direction orthogonal to the recording sheet conveyance direction and stopping at a predetermined position, and a stapler device for binding and stopping the recording sheet stored in the bin moved to the predetermined position. In the sheet post-processing apparatus, when the bin is moved by the moving unit, a recording paper pressing unit that presses a recording sheet surface in conjunction with a moving operation of the moving unit is provided in a part of the bin, and the recording is performed. It is characterized in that the friction coefficient μ1 of the surface where the recording paper pressing member of the paper pressing means contacts the recording sheet is formed substantially equal to the friction coefficient μ2 between the recording sheets.

According to a third aspect of the present invention, in the sheet post-processing apparatus, the recording paper pressing means includes a recording paper pressing lever rotatably provided on a side of the bin and the moving means. An engaging portion that turns the recording paper pressing lever together, a spring member that returns the recording paper pressing lever,
It is characterized by being constituted by.

A sheet post-processing apparatus according to a fourth aspect of the present invention is characterized in that the recording paper pressing means is provided in each of a plurality of bins.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet stacking apparatus and a sheet post-processing apparatus according to the present invention will be described below with reference to the accompanying drawings based on a specific example of a sheet post-processing apparatus.

FIG. 1 shows an image forming apparatus (for example, a copying machine) 10.
2 is a central cross-sectional view illustrating the configuration of the sheet post-processing apparatus 10 connected to the image forming apparatus 100, and FIG. 2 is a configuration diagram illustrating a combined state of the image forming apparatus 100 and the sheet post-processing apparatus 10. Note that the present invention is not limited to the present embodiment.

As shown in FIG. 1, a sheet post-processing apparatus 10
Is a conveyor belt 12 provided along the entrance side in a row of a plurality of bins (containers) 51a to 51n;
The distributor 21 is supported between the 1n rows so as to be able to reciprocate up and down.

That is, the bins 51a to 51n are attached to the housing 10c of the sheet post-processing apparatus 10 by means not shown in the drawing so that the bins are mounted in a line at equal intervals as bins 51a, 51b, 51c to 51n in order from the top. 51
a, 51b, 51c to 51n (hereinafter collectively referred to as bins 51) receiving members 52a, 52b, 52c to receive rear ends thereof
52n, U-shaped guide grooves 53a, 53b, 53c to 5c
The front end receiving member 54 formed with 3n is provided on the housing 10c, and the transport belt 12 is suspended on the transport belt pulleys 13a and 13b as shown in the drawing, and rotates clockwise as indicated by an arrow when driven. .

The recording sheet (recording paper) P on which an image is formed by the image forming apparatus 100 is discharged from a sheet discharge port 100g of the image forming apparatus 100, and is immediately inserted from a sheet receiving port 10g of the sheet post-processing apparatus 10. That is, the recording paper P is guided by the transport rollers 14 and the guide plate 16 and is transported to the downward traveling portion on the right side of the transport belt 12.

The distributor 21 has a recording paper P receiving guide member 23a having a receiving opening 23 with a wide opening at the upper part, and is integrally attached to the distributor frame 22. At the other end of the receiving port 23, a discharge port 23b is provided, and a pair of discharge rollers 30 are arranged in a vertical direction by a driving means (not shown) so as to be adjacent to the discharge port 23b. The recording paper P is discharged onto the bin 51 in the direction of the arrow through the discharge port 23b.

In FIG. 1, both ends of one timing belt 28b are fixed in front and back of both ends in the longitudinal direction of the distributor frame 22 as shown in FIG. It is suspended so as to be pulled by a belt 28b. A timing belt 28a is suspended between a timing gear 29a attached to a shaft of a stepping motor M1 as a driving motor and a timing gear 29b which rotates integrally with a timing gear 29c of a driving gear of the timing belt 28b. The rotating shaft of the timing gear 29b (29c) extends to the timing gear 29c of the timing belt 28b on the opposite side so that the front and rear timing belts 28b can be driven integrally.

A positioning sensor (not shown) is provided at a position corresponding to each bin 51 so that the distributor 21 can be stopped. The stepping motor M1 is driven by the information of the positioning sensor to move the distributor 21 to each bin 51. To stop at a predetermined position.

The timing belt 28b is also suspended by a timing gear 29d in the upper part of the sheet post-processing device, and the timing gear 29d is coaxially connected to the wire winding pulley 27. Wire take-up pulley 27
The wire 24 passes through the pulleys 27 a and 27 b and the wire receiver 26, and the tip thereof is attached to one end of a wire spring 25, and the other end of the wire spring 25 is hooked on the rotation shaft of the discharge roller 30. The wire spring 25 is a spring for applying an appropriate tension to the wire 24.

Note that the fact that the other end of the wire spring 25 is hooked on the rotation shaft of the discharge roller 30 is not particularly meaningful, but merely that there is a shaft that is just right for the spring hook. This means that the other end of the wire spring 25 is hooked on the distributor frame 22.

In this way, when the distributor 21 is driven vertically by the stepping motor M1, the distributor 2
1 timing gear 29 rotated by the vertical drive
The wire winding pulley 27 having the same diameter as that of the wire d is rotated, so that the wire 24 is also wound or unwound on the wire winding pulley 27 while maintaining an appropriate tension. That is, regardless of the position of the bin 51 where the distributor 21 is driven by driving the distributor 21 in the vertical direction,
The tension on the wire 24 will be maintained properly.

Further, in FIG. 1, on the running side of the distributor 21 of the conveyor belt 12, a portion substantially at the center between the pulley shafts of the conveyor belt pulleys 13 a and 13 b of the conveyor belt 12 is lighter than the inside of the conveyor belt 12. The pressing roller unit 40 that presses with a load will be described.

In the pressing roller unit 40, the pressing roller 41 is supported by a U-shaped plate 42, and the supporting shaft of the U-shaped plate 42 is pressed against a base 44 attached to the sheet post-processing apparatus frame 10f. It is designed to be inserted with a spring 43 interposed therebetween. Although not shown, the rotation shaft of the pressing roller 41 is connected to the conveyor belt pulleys 13a and 13b.
The structure is such that parallelism is maintained with respect to the rotation axis.

FIG. 3 is a sectional view of the bin 51 for discharging paper.
FIG. 3 shows a specific mounting structure of the bin 51 described with reference to FIG. 1 to the sheet post-processing apparatus 10, and the bins 51a and 51b of the bin 51 shown in FIG. Things.

First, the rear ends of the bins 51a, 51b are connected to the frame members 10a, 10b provided on both sides of the sheet post-processing device 10.
b, and a wall portion 51 formed at the rear end of the bottle 51a.
A receiving plate 521a that receives the recording paper P so as to be able to slide in a direction perpendicular to the sheet discharging direction and a receiving member 52a formed by the receiving plate 522a are provided. Have been.

The guide pin 5 shown in FIGS.
13a protrudes from the wall 511a of the bottle 51a and is slidably fitted in a guide groove 523a formed in the receiving member 52a. On the other hand, the distal end of the bin 51a is fitted into a U-shaped guide groove 53a of the distal end receiving member 54 as shown in FIGS. 1 and 3, and the guide groove 53a has a thickness and a length of the distal end of the bin 51a. , And a play width is provided as shown in the figure.

Similarly, the bins 51b, which are arranged side by side, are in close contact with the respective surfaces of the wall 511b and the bottom 512b formed at the rear end similarly to the bins 51a, and are perpendicular to the direction in which the recording paper P is discharged. Receiving plate 521b received so as to be slidable,
A receiving member 52b formed by a receiving plate 522b is provided. The bottle 511 is also provided with a wall portion 511 similarly to the bottle 51a.
b has a guide pin 513b, and is slidably fitted in a guide groove 523b formed in the receiving member 52b.

On the other hand, similarly to the bottle 51a, the bottle 51b
3 is fitted into a U-shaped guide groove 53b provided below the guide groove 53a as shown in FIG. The guide groove 53b is also formed wider than the thickness and length of the tip of the bottle 51b, and has a play width as shown in the figure. Since the bins 51a, 51b,..., 51n have the same shape, the bins 51a, 51b,.

FIG. 4 is a plan view showing the discharge bin 51 and the stapler 70.

The bin 51 is supported by the guide groove 53a of the receiving member 52a and the distal end receiving member 54 as described above. Although not particularly described in FIG. 3, the guide groove 5
3a shows a configuration in which the tip of the bin 51 is held at two places, but may be two or more places or wide in performance, and is not particularly limited. As shown in FIG.
In order to bind the plurality of recording papers P stacked on 1a to 51n, the recording papers P are slidably connected to a guide member 71 provided upright on the side (front side in the drawing) of each bin 51 and can move in the vertical direction. A stapler device 70 is provided.

The stapler device 70 is a wire for a stapler device (hereinafter referred to as an SP wire) 72 that is wound around a wire wheel of a drive transmission mechanism (not shown) described later provided on the upper surface of the sheet post-processing device 10. Is connected via a plurality of pulleys 73 and the other end of the SP wire 72 is connected to a weight 74 as shown in FIG. 1 so as to reduce the driving load when the stapler device 70 is raised. .
A moving device 75 that moves the bin 51 to perform a binding operation with the stapler device 70 is provided.

FIG. 5 is a side view showing the state of movement of the paper discharge bin 51. FIG. 5A shows the state before the movement of the bin 51 starts, and FIG. 5B shows the state after the movement of the bin 51. The state of is shown.

The moving device 75 is operated by a rotating member 76 which is rotated by a driving means. As shown in FIGS. 5A and 5B,
A protrusion 514 is formed on the side of the bin 51 and the protrusion 51 is formed.
4, a recording paper pressing member 55 provided with a recording paper pressing arm 55a.
Are rotatably supported by a support shaft 56, and a spring 57
Accordingly, the recording paper pressing arm 55a is provided so as to be separated from the recording paper P. Further, a projection 58 is provided on a part of the recording paper pressing member 55. The pull-out arm 78 engages with the projection 58 to move the bin 51 leftward in the figure against the urging force of the spring 79.

As shown in FIG. 1, the recording paper P is discharged by the distributor 21 in the page order into the bin 51 configured as described above, and the discharge is completed. Next, after the paper ejection is completed, a paper alignment member (alignment rod) 82 provided through the long hole 81 of the bin 51 is operated to press the recording paper P to the side of the bin 51 as shown in FIG. The side edges of the recording paper P are aligned.

Next, in order to perform the binding operation of a plurality of recording sheets P by the stapler device 70, the pivoting member 76 of the moving device 75 and the connecting rod 77 are attached to the pull-out arm 78 by the protrusion 58 of the recording sheet pressing member 55. Lock as shown in FIG.
The rotation member 76 is rotated to move the protrusion 58 to the left in FIG. At this time, the recording paper pressing member 55 rotates against the spring 79, and presses the upper end of the recording paper P with the tip of the recording paper pressing arm 55a as shown in the drawing, thereby pressing the recording paper P against the bin 51. Hold. Furthermore, the bin 51 moves together with the recording paper P in the direction of the stapler 70 by rotating the rotating member 76 and moving it to the left in the figure.

As shown in FIGS. 4A, 5A and 5B, the bin 51 is provided with one end of a spring 79, and the other end of the spring 79 is connected to the main body of the sheet post-processing apparatus 10. When the bin 51 moves to the left in the figure, it moves against the elasticity of the spring 79.

Further, as shown in FIG. 4 (a), the spring 79 is provided at an angle of θ with respect to the moving direction, and is disposed so as to slightly press the bin 51 toward the receiving member 52a. . During the movement of the bin 51, since the spring 79 is inclined by the θ angle as shown in FIG. 4B, the wall 511a formed at the rear end of the bin 51
Is generated in the direction of the receiving plate 521a by the inclination angle and the tensile force of the spring 79, so that the pressing force acts. Therefore, a vector B is generated as a pressing force against the receiving plate 521a, and the wall portion 511a of the bin 51 is constantly pressed against the receiving plate 511a by the pressing force of the vector B.

The rear end of the bottle 51 thus arranged is
The spring 79 is lightly pressed by the receiving plates 521a and 522a provided on the receiving member 52a, and when the pulling arm 78 pulls out the receiving plates 521a and 522a.
The wall portion 511a and the bottom portion 512a move while closely contacting with the weight of the bin 51 and move the recording paper P to the position of the stapler 70 accurately. Therefore, the binding operation can be performed by the stapler device 70 at a predetermined position on the recording paper P.

On the other hand, the leading end of the bottle 51 has a U-shaped guide groove 5.
3a, the guide groove 53a is formed to be wider than the thickness and length of the tip of the bottle 51 as described above.
Does not hinder movement within.

After the stapler 70 completes the binding operation on the recording paper P, the pull-out arm 78 is separated from the projection 58, and the bin 51 is automatically returned to the original position by the return force of the spring 79. After the binding operation of the bin 51a is completed, the stapler device 70 moves to the next bin 51b,
The recording paper P is bound by the same operation as described above.

Next, the bin moving means 75, the recording paper pressing means, and the stapler 70 of the sheet post-processing apparatus 10 of the present invention will be described.

FIG. 6 is a side view showing a state in which the bin 51 has been moved to the binding position of the stapler 70.

The bin moving means 75 moves the bin 51 from the position where the recording paper P is discharged to a direction perpendicular to the conveying direction of the recording paper P, and stops the bin 51 at a predetermined position close to the stapler device 70.

The recording paper pressing arm 55a of the recording paper pressing member 55 for pressing the uppermost surface of the recording paper P stacked on the bin 51
Is pressed by the recording paper pressing arm 55a from above the recording paper P during the movement of the bin 51 and during the binding operation of the recording paper P by the stapler device 70, and even during the binding operation, a part of the recording paper P is Prevent moving.

However, when the bin 51 moves, when the inertia force of the loaded bundle of recording papers to hold the stationary position exceeds the pressing force of the recording paper pressing member 55 by the recording paper pressing arm 55a. The recording paper holding arm 55a
A part of the upper layer of the recording paper in the vicinity of being in contact with the recording paper is dragged by the contact surface with the recording paper pressing arm 55a, and the recording paper below the upper recording paper is returned to its original position by inertia force. In order to hold the recording paper, a deviation of about 1 to 5 mm occurs between the upper recording paper and the lower recording paper in the bundle of recording papers.
In particular, in the case of large-size recording paper, thick recording paper, recording paper having a large coefficient of friction, heavy paper having a large specific gravity, etc., the deviation between the recording paper in the upper layer and the recording paper below is large. Further, even when the moving speed of the bin 51, particularly the moving acceleration, is large, the above-described deviation between the recording sheets is large.

FIG. 7A is a perspective view showing the bin 51 and the recording paper pressing means, and FIG. 7B is a schematic sectional view thereof.

In the sheet post-processing apparatus of the present invention, a relatively small static maximum friction coefficient is applied to a portion where the vicinity of the leading end of the recording paper pressing arm 55a of the recording paper pressing member 55 contacts the uppermost layer of the recording paper P. The contact member 59 was attached. The sliding contact member 59
And the uppermost recording paper P of the recording paper bundle stacked on the bin 51
The friction coefficient μ1 with 1 was selected so as to be substantially equal to the friction coefficient μ2 between the recording papers P1 and P2 (μ1 ≒ μ2).
The friction coefficient μ3 between the lowermost recording paper P3 of the recording paper bundle and the recording paper mounting surface of the bin 51 was selected to be substantially equal to the friction coefficient μ2 between the recording papers P2 and P3 (μ2 ≒ μ).
3). Therefore, each of the above-mentioned friction coefficients is μ1 ≒ μ2 ≒ μ3
Becomes

The sliding contact member 59 is made of polyethylene terephthalate (PET), ethylene tetrafluoride resin (PTF).
E), polyacetal resin (POM) or the like formed in a tape shape, and the sliding contact member 59 is adhered to the vicinity of the recording paper contact surface of the recording paper pressing arm 55a. Alternatively, the recording paper pressing arm 55a may be integrally formed of the above resin material.

A vertical pressing force (F) against the recording paper P by the recording paper pressing arm 55a to which the sliding contact member 59 is attached.
Is a spring 79 that is tensioned when the bin 51 is moved.
Applied by the pulling force of When the frictional force due to the product (μ1 × F) of the pressing force F and the friction coefficient μ1 is substantially equal to the frictional force due to the product (μ2 × F) of the pressing force F and the friction coefficient μ2 between the recording sheets. Is that even when the bin 51 is rapidly moved and a large inertial force is applied to the intermediate recording paper P2, the intermediate recording paper P2 also moves integrally with the upper recording paper P1, thereby causing a deviation. I will not do it.
The frictional force (μ3 × F) between the lowermost recording paper P3 of the recording paper bundle and the recording paper mounting surface of the bin 51 is the recording paper P2, P
3 is set to be substantially equal to the frictional force (μ2 × F) between the third recording paper P3 and the intermediate recording paper P3 even when a large inertia force is applied to the intermediate recording paper P3. The recording paper P3 also moves together with the recording paper P2 of the upper layer, so that no deviation occurs.

FIG. 8 is a schematic view showing the deviation of the end face of the recording paper which occurs when the bin 51 is rapidly moved.

FIG. 8A is a schematic view showing the recording paper pressing means according to the present invention, and shows an embodiment in which the recording paper P is pressed against the recording paper pressing arm 55a to which the sliding contact member 59 is attached. In this case, as described above, the recording paper pressing arm 55a
Friction between recording paper P1 and recording paper P1, friction between recording paper P1, and recording paper P
3 and the frictional force between the bin 51 and the recording paper mounting surface are almost equal.
The paper is aligned without any deviation. That is, the recording paper bundle loaded on the bin 51 and pressed by the recording paper pressing arm 55a moves integrally with the bin 51 and the recording paper pressing arm 55a even when the bin 51 moves abruptly, and the end face shifts. Does not occur.

A stapling device of the sheet post-processing device performs a binding process on the recording paper bundles aligned without any end surface deviation during the movement.

FIG. 8B is a schematic view showing a conventional recording paper pressing means. Each friction coefficient is expressed as μ1> μ2, μ3> μ
2, the uppermost recording paper and the recording paper pressing arm 55
Due to the frictional force with the recording paper holding arm 5,
5a, and the lowermost recording paper and bin 51
The recording paper of the lowermost layer moves together with the bin 51 due to the frictional force with the recording paper mounting surface of the recording paper. Therefore, the recording paper holding arm 55a
When the bin 51 and the bin 51 move rapidly together, the intermediate recording paper is left behind due to inertia, causing a shift,
The end face Qb of the recording paper is concave inside.

FIG. 8C is a schematic diagram showing another conventional recording paper pressing means. Μ1> μ2μμ3
In this case, the uppermost recording paper and the recording paper pressing arm 55a
Due to the frictional force with the recording paper holding arm 55
a, but the intermediate recording paper has a small frictional force between the recording papers, causing a displacement.
Is shifted from the recording paper mounting surface, and the end surface Qc of the recording paper has an inclined shape.

When the pressing force of the recording paper pressing arm 55a is increased in order to prevent the occurrence of the above described deviation of the end face of the recording paper bundle, not only an indentation is formed on the recording paper but also the bin 51 and the moving device. It is necessary to increase the mechanical strength and the torque of the driving source is increased, so that the manufacturing cost is increased.

[0057]

The sheet stacking device according to the first aspect of the present invention is characterized in that the coefficient of friction μ1 of the surface of the sheet pressing means of the sheet pressing means contacting the sheet is substantially equal to the coefficient of friction μ2 between the sheets. Therefore, when a container accommodating a plurality of sheets is suddenly moved, the plurality of sheets stacked on the container and pressed by the sheet pressing means can be accurately formed on the paper without causing any end face deviation. It is reliably moved while being aligned.

According to a second aspect of the present invention, there is provided a sheet post-processing apparatus comprising: a plurality of vertically stacked bins for distributing and storing recording sheets carried out from an image forming apparatus main body; and recording the bins. A sheet post-processing apparatus includes a moving unit configured to move the recording sheet in a direction perpendicular to a sheet conveying direction and stop at a predetermined position, and a stapler device configured to stap a recording sheet stored in the bin moved to the predetermined position. When the bin is moved by the moving unit, a recording paper pressing unit that presses a recording sheet surface in conjunction with the moving operation of the moving unit is provided in a part of the bin, and the recording paper of the recording paper pressing unit is provided. Since the friction coefficient μ1 of the contact surface of the holding member with the recording sheet is formed substantially equal to the friction coefficient μ2 between the recording sheets,
The stapling device of the sheet post-processing device surely performs the binding process on the recording sheet bundle that is aligned without any end surface deviation during the bin movement.

[Brief description of the drawings]

FIG. 1 is a central cross-sectional view illustrating a configuration of a sheet post-processing apparatus connected to an image forming apparatus main body.

FIG. 2 is a configuration diagram illustrating a combined state of an image forming apparatus and a sheet post-processing apparatus.

FIG. 3 is a cross-sectional view of a paper discharge bin.

FIG. 4 is a plan view showing a paper discharge bin and a stapler device.

FIG. 5 is a side view illustrating a movement state of a paper discharge bin.

FIG. 6 is a side view showing a state where the bin has been moved to a binding position of the stapler apparatus.

FIG. 7 is a perspective view and a schematic cross-sectional view showing a bin and a recording paper pressing unit.

FIG. 8 is a schematic diagram showing a deviation of an end surface of a recording sheet caused when a bin is rapidly moved.

[Explanation of symbols]

 Reference Signs List 10 sheet post-processing device 12 transport belt 21 distributor 51, 51a, 51b to 51n bin (container) 55 recording paper pressing member (sheet pressing member) 55a recording paper pressing arm 56 support shaft 58 protrusion 59 sliding contact member 70 stapler device 79 Spring P Recording sheet (recording paper) μ1, μ2, μ3 Friction coefficient

Claims (4)

[Claims] 1. A container for accommodating a plurality of sheets, a sheet pressing unit for pressing and holding the sheets stacked on the container, and a moving unit for moving the container while pressing the sheets. The sheet stacking apparatus according to claim 1, wherein a friction coefficient μ1 of a surface of the sheet pressing member of the sheet pressing means that contacts the sheet is substantially equal to a friction coefficient μ2 between the sheets. 2. A plurality of vertically stacked bins for distributing and storing recording sheets carried out from the image forming apparatus main body, and moving the bins in a direction orthogonal to the recording sheet conveyance direction to a predetermined position. And a stapler device for stapling the recording sheet stored in the bin moved to the predetermined position, wherein the bin is moved by the moving unit. A recording paper pressing means for pressing the recording sheet surface in conjunction with the movement of the means is provided in a part of the bin, and a friction coefficient μ1 of a contact surface of the recording paper pressing member of the recording paper pressing member with the recording sheet is determined. A sheet post-processing apparatus formed substantially equal to a friction coefficient μ2 between recording sheets. 3. The recording paper pressing means includes a recording paper pressing member rotatably provided on a side portion of the bin, and an engagement that engages with the moving means to rotate the recording paper pressing member. Part, a spring member for returning the recording paper pressing lever,
3. The sheet post-processing apparatus according to claim 2, further comprising: 4. The sheet post-processing apparatus according to claim 2, wherein said recording paper pressing means is provided in each of a plurality of bins.