JP2729405B2 - Paper ejection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper ejection method in which a plurality of finished sheets are ejected to a predetermined sheet receiving portion while sitting on a set of sheets. Related to the device.

[Conventional technology]

The paper discharge device of the above type is provided, for example, in a copy paper finishing processing device as shown in FIG.

Here, before describing the related art, the function of the copy paper finishing apparatus will be described below.

This copy paper finishing device is connected to a copying device (not shown), and the copy paper finishing device performs binding of copy paper with staples.

The copied copy paper (paper) coming out of the copy apparatus main body (not shown) advances in the direction of arrow d and enters the copy paper finishing processing device 3. When the copy paper is directly sent from the copy paper finishing device 3 to the next unit (for example, a sorter), the copy paper entering the copy paper finishing device 3 passes through the copy paper path 15. Is discharged as it is in the direction of arrow e.

Although not shown in FIG. 5, the copy paper path 15 is provided with a plurality of approach rollers and side stoppers for approaching and aligning the copy paper to the back side.
The rear side stoppers are arranged parallel to each other in the front-rear direction at an interval of 30 mm at the back side, and the front side stopper can be retracted into the passage 15, and if necessary, the copy paper is brought to one of the side stoppers be able to. Also copy paper passage 15
Are provided with two sensors 132 and 133, and whether or not the copy paper has passed normally is determined based on the passage time of the copy paper between them.

In the case where the copy paper is guided and stored in the interior of the copy paper finishing processing device 3 without being discharged to the outside, or the above-described binding mode is executed, the copy paper is moved by the deflection claw 16 to advance the copy paper. Change direction and copy paper path 17
It is led toward.

When the copy paper is guided to the discharge tray 32 as it is without performing the binding described above, the copy paper is transferred to the copy paper path 17.
Through the copy paper path 18, the paper is fed by a pair of transport rollers 19, 30 between a pair of downstream transport rollers 24, 25.
The paper is discharged in the direction of arrow B from between the pair of paper discharge rollers 29 ′ and 30 ′ via the portion 28 and stored on the paper discharge tray 32. At this time, the switching claw 26 occupies the position shown in FIG.

The upper surface of the copy paper discharged to the paper discharge tray 32 is detected by the sensor 138, and the operation of the paper discharge tray 32 in the vertical direction is controlled so that the upper surface of the stacked copy paper is always at a fixed position.

In the case of the binding mode described above, the deflecting pawl 22 is switched to the position shown in FIG. 6, and the copy paper is guided by the deflecting pawl 22 and has a projection example on the outer peripheral surface. Endless belt rotating normally in the direction of the arrow
It is sent in the direction of arrow H from between 23 and the transport roller 19,
It is placed on the staple staple binding table 33 composed of the fixed table 33A and the movable table 33B. In this mode,
When the copy paper passes through the copy paper path 15, the copy paper is moved only by the side stopper located on the front side.

In FIG. 5, reference numeral 34 denotes a stapler, which is movable in the direction shown by the arrow and in the direction perpendicular to the figure according to the size of the copy paper. This is provided with two stapler sections, a first stapler section and a second stapler section, and each stapler section can move independently in the vertical direction. The movable table 33B can move in the direction of the arrow in conjunction with the movement of the stapler 34.

5 and 6, the copy sheet discharged on the staple binding table 33 discharged in the direction of arrow H is
The stapler 34 moves to the target binding position in a state where the copy sheets 100 are aligned by the alignment stopper member 35 and all of the copy sheets 100 are placed on the staple binding table 33. The copy paper is bound by the staples. In this case, only one place may be bound, or two places may be bound.

When the binding is completed, the alignment stopper member 35 is retracted to the position indicated by the imaginary line in FIG. The copy paper discharged in the H direction is placed one by one on the staple stapling table 33 on the front side of the staple stapling table 33 by the rotation of the shift belt 36 shown in FIG. It is adapted to be brought closer to the stopper and aligned. As a result, the set of copy sheets is aligned and bound by the alignment stopper member 35 and the side stopper (not shown). The shift belt 23 is not shown in FIG. 6 to avoid congestion in the drawing.

The relay unit 37 including the pair of transport rollers 24 and 25, the switching claw 26, and the like is held at the position shown in FIG. 6, and the bound copy paper 100 is fixed by the retreat operation of the alignment stopper member 35. Sliding on table 33A, relay unit 3
It is held between the pair of transport rollers 24 and 25 of FIG.

The rollers 24 and 25 are driven to rotate in the directions indicated by arrows in FIG. 6 when the copy paper 100 is fed to the position indicated by the phantom line in FIG. After that, when the copy paper 100 has advanced a predetermined distance, the rotation of both rollers is stopped, and the copy paper 100 is temporarily stopped at this position. Of the pair of transport rollers 24, 25, the roller 25 is urged in the direction of arrow f by the elastic force of a spring (not shown), so that it can respond to the difference in the thickness of a plurality of sheets of copy paper. ing. The switching claw 26 does not prevent the copy paper 100 from entering.
Occupy in the position shown.

As shown in FIG. 6, a plurality of sheets of copy paper 100
Is stopped at the virtual line position, and the relay unit 37 is pivoted.
It turns counterclockwise in the figure around 38 and stops at the position shown in FIG.

In this state, the pair of transport rollers 24 and 25
Is placed at a position facing the pair of paper discharge rollers 29 ', 30'. Next, the transport rollers 24, 25 on the side of the relay unit 37 rotate in the reverse direction this time, and accordingly, a set of a plurality of copy sheets 100 is sent out from the relay unit 37, and the discharge rollers 29 ', 30' And is stored in the paper discharge tray 32.

In this way, a set of a plurality of copy sheets is bound and stored in the discharge tray 32. When the number of bound sheets is very small, for example, about 2 to 3 sheets, Since the overall stiffness is weak, a plurality of sheets of copy paper may be curled, and may be randomly loaded on the paper discharge tray 32. In some cases, the copy sheets are not bound.In this case, the copy sheets are discharged one by one to the discharge tray 32. This curls up, and the paper tray 32 is randomly loaded.

In order to deal with such a point, for example, as shown in FIG. 1, a stiffening roller is used as a paper discharge roller, and the stiffness is given to the copy paper discharged by this.
In this example, the lower discharge roller 30 has a flange 30 on both sides.
It is the one with b.

In such a paper discharging device, the copy paper is moved up and down so that the paper is smoothly discharged in consideration of the fact that the number of sheets of a set of sheets that have been subjected to finishing processing such as binding is very large. One of the paper discharge rollers is urged by a spring or the like so as to press against the other paper discharge rollers to increase the conveying force.

[Problems to be solved by the invention]

However, in this case, when the number of sheets to be stapled is very small, or when the copy sheets are discharged to the discharge tray 32 one by one without binding, the above-described operation of the pressing force causes Copy paper is easily scratched.

An object of the present invention is to provide a discharge / conveyance function corresponding to a large number of finished sheets, and to provide a very small number of finished sheets or a single sheet of paper. It is an object of the present invention to provide a sheet discharging device that can smoothly discharge a sheet without damaging the sheet by a stiffening roller when the sheet rolls.

[Means for solving the problem]

In order to achieve the above object, the present invention is a sheet discharging device provided with a pair of stiffening rollers for discharging a sheet to a sheet receiving portion while stiffening the sheet, wherein one of the stiffening rollers is provided. When a small set of finished sheets or a single sheet of unfinished sheet passes, the passing sheet is pushed up against the weight of the roller, and a set of large number of finished sheets is passed. The present invention proposes a configuration in which a stiffening roller is configured such that, when a sheet passes, the sheet is pushed up by the passing sheet and then urged in a direction approaching the other stiffening roller.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, one lower stiffening roller 30 has a flange 30b provided on both sides of a roller portion 30a as described above. The other upper stiffening roller 29 is a single roller, and rests on its own weight on the roller portion 30a of the flat, lower stiffening roller 30.

The lower stiffening roller 30 is a driving stiffening roller. When the sheet passes between the two stiffening rollers 29 and 30 while being stiffened with a predetermined conveying force, the upper stiffening roller 30 is used. The roller 29 rotates following the movement of the sheet.

When a pair of finished sheets are discharged by such a pair of stiffening rollers, the sheets are properly aligned in a sheet receiving portion such as the discharge tray 32 (FIG. 5). Tends to be contained. However, when the number of sheets to be stapled increases and the weight of a set of sheets increases, the stiffening roller 29 cannot be stretched by its own weight. The paper is conveyed under pressure.

FIG. 4 shows an example of a pressurizing means that has been frequently used until now. A shaft 40 to which the stiffening roller 29 is fixed is rotatably supported by a bearing 42, which is a main body side plate 43 '.
, And the waisting roller 29 is pressed against the waisting roller 30 by the elastic force of the compression spring 44. When a set of finished sheets passes, the stiffening roller 29 is pushed up by the sheet passing against the elasticity of the spring 44, and in this state, the set of sheets is Is attached to

However, when a very small number of bound sheets or a single sheet of unbound paper is passed between the stiffening rollers configured as described above, the force of the spring is also increased. There is a possibility that the sheet may be damaged by the collar 30b due to the action of the flange 30b.

The present invention has been made to solve such a technical problem.

In FIG. 1, one end of a shaft 41 to which the stiffening roller 30 is fixed is rotatably supported by a main body side plate 43 via a bearing 45,
Although not shown, the other end is similarly rotatably supported by the other main body side plate, and is configured to be rotationally driven by a driving device (not shown). Meanwhile, the stiffening roller 29
A bearing 46 is attached to one end of the shaft 40 to which the shaft 40 is fixed, and the shaft 40 is rotatable with respect to the bearing 46. Similarly,
Although not shown, the other end of the shaft 40 is similarly configured.

As shown in FIG. 2, the protrusion 46a of the bearing 46 is
It is fitted into the lower narrow portion of the opening guide portion 43A provided in 3. The projecting portion 47a of the spring receiving piece 47 is fitted into the wide portion on the upper side of the opening guide portion 43A. A compression spring 48 is interposed between the spring receiving piece and the main body side plate, and the projecting portion 47a of the spring receiving piece 47, under the action of the elasticity of the compression spring 48, has the wide portion and the width of the opening guide portion 43a. It is engaged with the step 43A ₁ (FIG. 3) at the boundary with the narrow portion.

In FIG. 1 and FIG. 2, when a very small number of sheets, which have been bound and finished, pass between the two stiffening rollers, the upper stiffening rollers 29 are used by the passing sheets. Is pushed up against the own weight, and under the action of the own weight, the set of sheets is perforated. The range in which the stiffening roller 29 is pushed up against its own weight is the range of the clearance δ between the bearing 46 and the spring receiving piece 47. Within this range, only the own weight acts on the sheet, and the compression spring 38 Is not affected. Even when finishing processing such as binding processing is not performed, one sheet of paper is conveyed while being crimped by the crimping rollers 29 and 30 under the action of its own weight.

On the other hand, when a sheet having a large number of sheets to be bound passes, first, the bearing 46 is pushed up by the passing sheet, and thereafter, the bearing 46 comes into contact with the spring receiving piece 47, and the spring receiving piece 47 is further moved. Push up against the elasticity of the compression spring 48.

The amount of rise of the spring receiving piece 47 varies depending on the number of sheets, but in any case, at a predetermined rising position, the stiffening roller 29 is substantially pressed by the elastic force of the spring 48, and a bundle of sheets Is attached to After all, the waist roller 29 has a clearance δ
Then, it is urged in a direction approaching the stiffening roller 30. Now, the pressing force between both stiffening rollers is N
Assuming that the friction coefficient between the stiffening roller and the sheet is μ, the sheet conveyance force F is μN. Therefore, by increasing the pressing force N with a spring or the like, the paper conveying force can be increased.

In the case where the stiffening under the action of its own weight is not sufficient, a compression spring smaller than the elastic force of the spring 48 may be inserted between the bearing 46 and the spring receiving piece 47.

〔The invention's effect〕

According to the configuration of the present invention, when a set of very small number of finish-processed sheets or a single sheet of paper is conveyed with a waist, the paper is not damaged by a waist roller, and When transporting a large set of finished sheets, the paper can be transported with sufficient slack, and whether a single sheet or a large number of sheets has been processed is small. At all times, it can be neatly stored in the paper receiver.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a sheet discharging device according to an embodiment of the present invention;
FIG. 2 is a side view of a pressing component of the stiffening roller, FIG. 3 is a side view of a main body side plate of the pressing component, FIG. 4 is a perspective view of a conventional pressing component, and FIG. FIG. 6 is a side view of a copy paper finishing processing apparatus provided with a conventional paper discharge device, FIG. 6 is a side view of a paper deflection component after copy paper finish processing, and FIG. FIG. 7 is an operational view from FIG. 6 showing a state in which the state is switched to the posture. 29, 30… Roller roller 32… Output tray as paper receiving unit

Claims (1)

(57) [Claims] 1. A paper discharge device comprising a pair of corrugating rollers for discharging a paper to a paper receiving portion while corrugating the paper, wherein one of the corrugating rollers is provided with a small finish-processed roller. When a set of sheets of paper or a sheet of paper not subjected to finish processing passes, the passing sheet is pushed up against the own weight of the roller, and when a set of many sheets of paper subjected to finish processing passes, A sheet discharging device comprising a stiffening roller which is urged in a direction approaching the other stiffening roller after being pushed up by the passing sheet.