JPH11217151A - Structure of exhaust paper end fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain an exhaust paper collision sound at the exhaust paper loading time on to an exhaust paper stand by constituting so that the upper end of a sponge body installed on the exhaust paper catching surface side of a fence body through a clearance between the exhaust paper and the exhaust paper catching surface is supported displaceably in a vertical direction and its lower end is fixed. SOLUTION: On the upper part of a fence body 11, an engaging part 11b with Japanese U letter shape is formed on the tip of the extension part, 11a extended inside an exhaust paper stand 6 and the lower end of the sponge body 12 is adhered and fixed to the exhaust paper catching surface 11c of the fence body 11 and its upper end is entered in the engaging part 11b. Even when a great amount of printing matters P are loaded on the exhaust paper stand 6, by the downward displacement of the upper end of the sponge body 12, the space d1 between the back surface of the sponge main body 12 at the collision position to the sponge body 12 of the printed matters P and the exhaust paper catching surface 11c of the fence body 11 is not almost reduced from the set space of an initial state. Therefore, the collision energy of the printed matters P is relieved alike the initial state and the noise at the collosion time can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper discharge device for discharging and stacking image-formed paper discharge and the like discharged from an image forming apparatus such as a stencil printing machine and a copying machine. The present invention relates to a structure of a paper discharge end fence that performs this paper discharge alignment on a paper discharge table.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a stencil printing machine or a copying machine, a sheet on which an image is formed and discharged is stacked on a discharge table of a discharge device having a discharge end fence and a discharge side fence. doing. In this paper discharge device, the paper discharged from the paper discharge port of the image forming apparatus falls on a paper discharge table after colliding with a paper discharge end fence.
There has been a problem that the alignment of the paper on the paper output table (hereinafter referred to as “paper output alignment”) is deteriorated due to the rebound at the time of the paper output end fence collision, and a collision sound is generated at the time of the collision.

Therefore, a thin sheet elastic member which is bent by its own weight so as to have a gap between the sheet discharge end fence and the sheet discharge end fence is disposed on the sheet discharge end fence side of the sheet discharge end fence, and the sheet discharge contacts the thin sheet elastic member. After receiving the paper, the paper is caught by the paper discharge end fence, and the collision force of the paper discharge is reduced by the air layer between the thin film elastic member and the paper discharge end fence, improving the paper discharge alignment and suppressing the collision noise. See, for example, JP-A-8-20
No. 468.

[0004]

However, according to the technique disclosed in the above publication, the discharge collision force is reduced by the thin elastic member, so that the discharge collision force is large when thick paper is used. In this case, the collision force cannot be alleviated, and the discharged paper collides with the discharge end fence, generating noise. In addition, since the thin plate elastic member is bent by its own weight, it is difficult to set the gap between the thin plate elastic member and the discharge end fence to an optimum value, and the deformation of the thin plate elastic member becomes large due to the temporal deformation, and the discharge is increased. There is a problem that the gap between the paper fence and the paper end fence becomes large and the paper discharge alignment becomes worse.

Further, in a general image forming apparatus, the leading end (front end) of the discharged paper is brought into contact with a discharge end fence to perform discharge alignment, so that the discharge tray is lowered toward the downstream side in the discharge direction. It is provided at an angle. When the above-described technology is applied to the paper discharge tray, when the discharged paper is stacked on the paper discharge tray, the thin plate elastic member is pushed toward the paper discharge end fence by the paper discharge, and FIG. 11 (a) and FIG. As shown, the gap d3 between the discharge end fence and the thin plate elastic member at the portion where the discharge collides is significantly smaller than the set gap d2, and there is a problem that the collision force of the discharge cannot be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to suppress the collision sound at the time of a paper ejection collision and improve the paper ejection alignment even when the paper ejection is stacked on the paper ejection tray. The aim is to provide a possible delivery end fence structure.

[0007]

According to the first aspect of the present invention,
In the structure of a paper discharge end fence that receives a paper discharge and aligns the paper discharge on a paper discharge tray, the paper discharge end fence includes a fence body standing on the paper discharge table and a paper discharge of the fence body. A sponge body attached to the receiving surface side with a gap between the paper ejection receiving surface and the paper ejection receiving surface, wherein the sponge body has an upper end supported so as to be vertically displaceable and a lower end fixed. Features.

According to a second aspect of the present invention, in the structure of a discharge end fence for receiving a discharge and aligning the discharge on the discharge tray, the discharge end fence stands on the discharge tray. And a sponge body attached to the paper discharge receiving surface side of the fence body via a gap between the paper discharge receiving surface and the sponge body. It can be displaced in the direction.

According to a third aspect of the present invention, in the structure of the paper discharge end fence according to the second aspect, the fence body further has a positioning portion with which both side ends of the paper discharge can abut. I do.

According to a fourth aspect of the present invention, in the structure of the discharge end fence according to the third aspect, the positioning portion is provided at a position retracted from a discharge collision surface of the sponge body. And

According to a fifth aspect of the present invention, in the structure of the discharge end fence according to any one of the first to fourth aspects, the sponge body is further provided on a contact surface of the discharge end. It has a thin film made of an elastic body.

[0012]

FIG. 1 is a schematic view of a stencil printing apparatus as an image forming apparatus to which the first embodiment of the present invention is applied. In the figure, reference numeral 1 denotes a stencil printing device, reference numeral 2 denotes a plate cylinder, reference numeral 3 denotes a paper feeding device, reference numeral 4 denotes a press roller, and reference numeral 5 denotes a paper discharging device. The printing paper P fed from the paper feeding device 3 to the plate cylinder 2 on which the master plate is wound is pressed by the press roller 4 onto the plate cylinder 2 to transfer a print image, and then discharged. It is sent to the paper device 5.

The paper discharge device 5 includes a paper discharge table 6 on which printed print papers P on which print images are transferred are sequentially stacked, and a printed print paper P arranged near the plate cylinder 2 for printing. A peeling claw 7 that peels off from the outer peripheral surface; and a suction unit 8 that sucks the printed printing paper P that has been peeled off by the peeling claw 7 and conveys the paper P in the paper discharge conveyance direction indicated by the arrow X and discharges it onto the paper discharge table 6.
And The discharge conveyance speed of the printing paper P by the suction unit 8 can be appropriately changed in accordance with the printing speed which is the rotation speed of the plate cylinder 2.

On the paper discharge path of the suction unit 8, the printing paper P discharged in order to increase the apparent stiffness is
A pair or two pairs of stiffening members 8a for deforming into a letter shape are provided. The stiffening member 8a is configured such that the ridge angle or ridge height can be appropriately changed according to the type of the printing paper P. The configuration of the stiffening member is disclosed, for example, in Japanese Utility Model Publication No. 5-6305.

As shown in FIG. 2, a discharge side fence for discharging the printed printing paper P in a discharge width direction indicated by an arrow Y perpendicular to the discharge conveyance direction X is provided on the discharge tray 6. 9, 9 and a discharge end fence 10 for receiving the leading end of the print sheet P and aligning the discharge of the print sheet P in the sheet discharge conveyance direction X are provided upright.

Each of the paper discharge side fences 9, 9 has its base end supported by a stay provided on the paper discharge table 6, and moves on the paper discharge table 6 in the paper discharge width direction Y (not shown). They are provided freely and foldably toward the side (inward) where the printing paper P is stacked. Further, the paper discharge side fences 9, 9 are connected to each other by a rack and pinion mechanism (not shown), and when one of them is moved, the other is also moved.

The paper discharge end fence 10 is movably movable in a direction parallel to the paper discharge conveyance direction X on a rail member (not shown) fixed on the paper discharge table 6 so as to be flush with the paper discharge table 6. Installed. The discharge end fence 10
As shown in FIG. 3 and FIG. 4, it mainly comprises a fence body 11 and a sponge body 12.

The fence body 11 is made of, for example, acrylonitrile butadiene styrene (ABS), polystyrene (P
S), and made of a synthetic resin such as polycarbonate (PC) to reduce the weight. The fence body 11 has an extending portion 11a extending inwardly (into the sheet stacking side) of the sheet discharge tray 6 at an upper portion thereof, and a U-shaped opening at the tip of the extending portion 11a. Is formed. The lower end of the fence body 11 is supported by the paper discharge tray 6 so that the fence body 11 can be folded inward.

The sponge body 12 is made of a foamable resin such as foamed chloroprene rubber or foamed polyurethane. The lower end of the sponge body 12 is the fence body 1
1 is fixed to the discharge receiving surface 11c by bonding or the like,
The upper end is fitted into the engaging portion 11b, and the printing paper P
Absorbs the collision energy when the tip collides.

With the above configuration, even when a large amount of printing paper P is stacked on the paper discharge tray 6 as shown in FIG. 5, the upper end of the sponge body 12 is displaced downward, The distance d1 between the back surface of the sponge body 12 and the paper discharge receiving surface 11c of the fence body 11 at the position where the print paper P collides with the sponge body 12 is set in an initial state in which the print paper P is not stacked on the paper discharge tray 6. Interval d0
4 (see FIG. 4), the collision energy of the printing paper P is hardly reduced as in the initial state, and noise at the time of collision can be reduced. In addition, since the sponge body 12 has a sufficient thickness, it is possible to prevent the reduction of noise and the deformation with time.

FIGS. 6 and 7 show a discharge end fence 13 used in the second embodiment of the present invention. The discharge end fence 13 is the same as the discharge end fence 10,
It is mainly composed of a fence body 14 and a sponge body 12.

The fence body 14 is made of the same synthetic resin as the fence body 11 and has an extension 14a extending inwardly of the paper discharge tray 6 at an upper portion thereof. A flat portion 14b parallel to the paper discharge receiving surface 14c is formed at the leading end. The lower end of the fence body 14 is foldably supported by the paper discharge tray 6. Sponge body 12
Has its upper end fixed to the plane portion 14b.

With the above configuration, even when a large amount of printing paper P is stacked on the paper discharge tray 6, the lower end of the sponge body 12 is displaced rearward (to the left in FIG. 7). Similarly to the first embodiment, the distance between the back surface of the sponge body 12 and the paper discharge receiving surface 14c of the fence body 14 at the position where the printing paper P collides with the sponge body 12 is smaller than the distance set in the initial state. The collision energy of the printing paper P is hardly reduced, as in the initial state, and the noise at the time of collision can be reduced.

FIGS. 8 and 9 show a discharge end fence 15 used in the third embodiment of the present invention. The paper discharge end fence 15, like the paper discharge end fences 10, 13, is mainly composed of a fence body 16, a sponge body 12, and a thin film 17.

The fence body 16 is made of the same synthetic resin as the fence body 11 and has an extension 16a extending inwardly of the paper discharge tray 6 at an upper portion thereof. A flat portion 16b parallel to the paper discharge receiving surface 16c is formed at the leading end. In addition, the fence body 16 is provided with positioning portions 16 protruding inward at both side edges in the sheet discharge width direction.
d and 16d are formed. Positioning parts 16d, 16
d is a hinge (not shown) that is foldably provided at the position indicated by the two-dot chain line in FIG.
d and 16d are provided so as to be foldable toward the inside of the paper discharge tray 6 in a folded state.

The upper end of the sponge body 12 has a flat surface 1
6b, and the paper discharge contact surface thereof is
It is attached so as to slightly protrude inward of the paper discharge tray from 6d. The thin film 17 made of an elastic material such as mylar is fixed to the discharge contact surface of the sponge body 12 by bonding or the like.

With the above-described configuration, even when a large amount of printing paper P is stacked on the paper discharge tray 6 as shown in FIG. 10, the lower end of the sponge body 12 is positioned rearward (see FIG. 10).
, The distance between the back surface of the sponge body 12 and the paper discharge receiving surface 16c of the fence body 16 at the collision position of the printing paper P with the sponge body 12 as in the first embodiment. In the state, the collision energy of the printing paper P hardly decreases with respect to the set interval, and the collision energy of the printing paper P can be reduced as in the initial state.
By having 7, it is possible to improve the slip of the printing paper P and to further reduce the noise at the time of collision. The loaded printing paper P is
Since the front end portion of the sponge body 12 contacts the sponge body 12 and then falls while contacting the positioning portion 16d, it is possible to satisfactorily perform sheet ejection alignment.

In each of the above embodiments, each fence 1
1, 14, 16 as the respective paper discharge receiving surfaces 11c, 14
A member having a reinforcing material such as a rib on the surface facing c and 16c may be used. Further, the sponge body 12 is made of a printing paper P
The material is not limited to a foamable resin as long as it is a member that can absorb energy at the time of collision. Further, the sponge body 12 with the thin film 17 attached thereto may be used in the first and second embodiments, and the sponge body 12 with the thin film 17 removed therefrom may be used in the third embodiment.

Although the above embodiment has been described using a stencil printing apparatus as an example, the present invention is not limited to a stencil printing apparatus.
The present invention is applicable to all image forming apparatuses such as other printing apparatuses and copiers that have a paper discharge device that receives a paper discharge on which an image is formed.

[0030]

According to the first and second aspects of the present invention, even when a large amount of printing paper is stacked on the paper discharge tray, the sponge body and the fence at the collision position of the printing paper against the sponge body. Since the gap with the body is hardly reduced with respect to the gap set in the initial state, the collision energy of the printing paper can be reduced in the same manner as in the initial state. Can be reduced. In addition, since the sponge body has a sufficient thickness, reduction of noise and prevention of deformation with time can be achieved.

According to the third aspect of the present invention, the front end of the stacked printing papers abuts on the positioning portion, so that the paper discharge can be properly aligned.

According to the fourth aspect of the present invention, the discharged sheet comes into contact with the sponge body before the positioning section.
It is possible to reliably reduce the collision energy and reduce the noise.

According to the fifth aspect of the present invention, the noise at the time of collision can be further reduced by the synergistic effect of the sponge body and the thin film.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a stencil printing apparatus employing a first embodiment of the present invention.

FIG. 2 is a partial perspective view of the sheet discharging device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a paper discharge end fence for explaining the first embodiment of the present invention.

FIG. 4 is a side view of the paper ejection end fence in an initial state, illustrating the first embodiment of the present invention.

FIG. 5 is a side view of the first embodiment of the present invention when sheets are stacked on a sheet discharge end fence.

FIG. 6 is a perspective view of a paper discharge end fence for explaining a second embodiment of the present invention.

FIG. 7 is a side view of a paper discharge end fence in an initial state, illustrating a second embodiment of the present invention.

FIG. 8 is a plan view of a paper discharge end fence for explaining a third embodiment of the present invention.

FIG. 9 is a side view of a sheet discharge end fence in an initial state for explaining a third embodiment of the present invention.

FIG. 10 is a side view illustrating a sheet discharge end fence when a sheet is loaded according to a third embodiment of the present invention.

11A is a side view of a conventional paper discharge end fence in an initial state, and FIG.

[Explanation of symbols]

 6 Discharge table 10, 13, 15 Discharge end fence 11, 14, 16 Fence body 11c, 14c, 16c Discharge receiving surface 12 Sponge body 16d Positioning unit 17 Thin film P Discharge (print paper)

Claims (5)

[Claims] 1. A discharge end fence structure for receiving a discharge and aligning the discharge on a discharge tray, wherein the discharge end fence comprises: a fence body standing on the discharge tray; A sponge body attached to the paper discharge receiving surface side of the fence body with a gap between the paper discharge receiving surface and the sponge body, the sponge body having an upper end supported so as to be vertically displaceable and a lower end A discharge end fence structure that is fixed. 2. A discharge end fence structure for receiving a discharge and aligning the discharge on a discharge tray, wherein the discharge end fence comprises: a fence body standing on the discharge tray; A sponge body attached to the paper discharge receiving surface side of the fence body via a gap between the paper discharge receiving surface and the sponge body, wherein the sponge body has an upper end fixed,
A discharge end fence structure wherein the lower end is displaceable in the front-rear direction. 3. The paper discharge end fence structure according to claim 2, wherein said fence body has a positioning portion with which both side ends of said paper discharge can abut. 4. The discharge end fence structure according to claim 3, wherein said positioning portion is provided at a position retracted from a discharge collision surface of said sponge body. 5. The paper ejection end according to claim 1, wherein the sponge body has a thin film made of an elastic material on a contact surface of the paper ejection. Fence structure.