JPH06227682A - Paper feeding carrier device - Google Patents

Abstract

PURPOSE:To improve picture quality by way of reducing a load of a paper feeding mechanism and decreasing an abrasion loss at the time when a sheet is carried to a carrier mechanism or it is in the middle of carriage. CONSTITUTION:A paper feeding and carrier device 11 is constituted of a carrier mechanism 90 and a paper feeding mechanism 12, and at least one of carrier bodies is a cylindrical body 4 and the others are divided members 13A, 13B, 13C divided in the longitudinal direction and pressurizing a sheet 7. Additionally, an abrasion resistance holding plate 14 to release pressurization of a part of these divided members 13A, 13B, 13C is provided, and the divided members 13A, 13B, 13C are made abrasion resistance members having abrasion resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding / conveying apparatus for feeding and conveying in equipment such as an image forming apparatus.

[0002]

2. Description of the Related Art FIG. 8 is a schematic explanatory view of a conventional paper feeding / conveying device, and FIG. 9 is a schematic explanatory view of a pressure releasing means of the paper feeding mechanism of FIG. 8 and 9, the paper feeding / conveying device 1
Is a transport mechanism 9 including a transport roller 2 and a driven roller 3.
And a paper feed mechanism 8 including an elastic roller 4 and a friction resistance member 5 having a frictional resistance between the elastic roller 4 and a pressure spring 6 for pressing the friction resistance member 5, and the paper feed mechanism 8 The sheet 7 conveyed by is conveyed further by the conveying mechanism 9. The sheet pressing plate 10 is the sheet 7
Is pressed by a pressure spring 6, and the elastic roller 4 feeds the sheets 7 in the traveling direction P one by one.

[0003]

By the way, the sheet feeding mechanism 8 is provided.
Since a speed difference is generated between both sides of the transport mechanism 9 and the transport mechanism 9, the pulling force of the transport mechanism 9 and the pulling force of the paper feeding mechanism 8 act, and a load is applied to both sides. Therefore, there is a problem in that the elastic roller 4 and the frictional resistance member 5 cause a slipping state of the sheet 7, the amount of wear increases, and the durability performance deteriorates.

Further, when the sheet 7 is removed from the sheet feeding mechanism 8, the load on the transport mechanism 9 is reduced and the slip of the sheet 7 is eliminated, so that the sheet speed is suddenly increased.
For example, in an image forming apparatus or the like, there is a problem that the image quality is deteriorated because the influence is related to the expansion and contraction of the image.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to reduce the load on a sheet feeding mechanism when a sheet is conveyed to a conveying mechanism or during the conveyance, reduce the amount of abrasion and improve the image quality. The purpose of the present invention is to provide a paper feed / transport mechanism.

[0006]

In order to achieve the above object, the present invention is a sheet feeding / conveying device for feeding / conveying a sheet by a pair of conveying bodies, wherein at least one of the conveying bodies is a cylindrical body. The other is a divided member that is divided in the longitudinal direction and pressurizes the sheet, and is provided with a pressure releasing unit that releases pressure on a part of the divided member. .

Further, according to one embodiment of the present invention, the divided member is a friction resistance member having a friction resistance.

[0008]

By employing the paper feeding / conveying device of the present invention, at least one of the conveying members is a cylindrical member, and the other is a member to be divided in the longitudinal direction to press the sheet. By providing a pressure releasing means for releasing a part of the pressure and the divided member being a friction resistance member having a friction resistance, when the sheet is conveyed to the conveyance mechanism or during the conveyance, The load is reduced, the amount of wear is reduced, and the image quality is improved.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 3 is a schematic block diagram of a paper feeding / conveying apparatus in which the present invention is implemented. In the figure, the paper feeding / conveying device 11
Is composed of a transport mechanism 9 and a paper feed mechanism 12. The transport mechanism 9 includes a transport roller 2 and a driven roller 3.

The paper feed mechanism 12 includes a cylindrical elastic roller 4 and
The divided frictional resistance members (divided frictional members) 13A, 13B, 13C having a frictional resistance with the elastic roller 4 and divided into a plurality of pieces in the longitudinal direction, three pieces in this embodiment, and the divided frictional member 13A. , 13B, 13C, respectively.

The sheet 7 is fed by the rotation of the elastic roller 4 in the sheet feeding mechanism 12, and in order to prevent two or more sheets 7 from being fed, the split friction members 13A, 13 are provided.
B and 13C are pressed to separate the sheet 7, and only one sheet 7 is fed and conveyed.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 2 is an operation state diagram of FIG. In FIG. 1 and FIG. 2, the pressure releasing means of the paper feeding mechanism 12 is the frictional resistance holding plate 14 in this embodiment, for example, divided friction members 13A, 13C.
When the sheet pressure plate 10 descends around the shaft support portion 16, the sheet pressure plate 10 comes into contact with the projection portion 15 and moves the divided friction members 13A and 13C downward to release the pressing force, and the sheet 7 is pressed. The pressure is released.

By releasing this pressure, the load on the sheet 7 is reduced, and the factors of the slip of the sheet 7 in the transport mechanism 9 and the speed difference given to the sheet 7 are reduced.

FIG. 4 is a schematic block diagram of another embodiment of the present invention.
5 shows an operation state diagram of a main part of FIG. 4 and 5, two or more sheets 7 are sandwiched between the elastic roller 4 and a plurality of, in this embodiment, three divided retard rollers 18A, 18B, 18C of the paper feed mechanism 17. The retard rollers 18A, 18B and 18C are configured to rotate in the reverse direction of the sheet 7 due to the frictional resistance and the torque thereof.

For this reason, after the sheet 7 is fed, in order to move the pressing force of the retard rollers 18A and 18C in the releasing direction, a friction resistance holding plate which is a pressure releasing means similar to that shown in FIGS. 1 and 2. 14 shall be provided.

FIG. 6 is a schematic configuration diagram of still another embodiment of the present invention, and FIG. 7 is an operation state diagram of a main part of FIG. 6 and 7, elastic rollers 19A, 19B and 19C divided into a plurality of, in this embodiment, three, and sheet pressing plate 2
0 holds the pressing relationship. After feeding the sheet 7, the elastic rollers 19A and 19C move in the pressing release direction. The separating claw 21 is the sheet 7 on the sheet pressing plate.
Are separated one by one when being sent out by the elastic rollers 19A, 19B and 19C.

The sheet feeding / conveying device 1 configured as described above
The specific time at which the frictional resistance holding plate 14, which is the pressure release means, operates is easily detected when the sheet 7 is conveyed to the conveying mechanism 9 or by a position sensor (not shown) provided in the middle thereof. You can Therefore, it is possible to reduce the load generated during conveyance, reduce the amount of wear, and improve the image quality.

The present invention is not limited to the above embodiments, but can be implemented in other modes by making appropriate design changes.

[0020]

As is apparent from the above description, in the paper feeding / conveying device of the present invention, at least one of the conveying bodies is a cylindrical body, and the other is divided in the longitudinal direction so as to press the sheet. By providing a pressure releasing means for releasing pressure on a part of the member to be divided, and by making the member to be divided into a friction resistance member having a friction resistance, the problems of the prior art are effectively solved. The load on the sheet feeding mechanism is reduced when the sheet is conveyed to the conveying mechanism or during the conveyance.
The amount of wear is reduced and the image quality is improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is an operation state diagram of FIG.

FIG. 3 is a schematic configuration diagram of a paper feeding / conveying device in which the present invention is implemented.

FIG. 4 is a schematic configuration diagram of another embodiment of the present invention.

5 is an operation state diagram of a main part of FIG.

FIG. 6 is a schematic configuration diagram of still another embodiment of the present invention.

7 is an operation state diagram of a main part of FIG.

FIG. 8 is a schematic explanatory diagram of a conventional paper feeding / conveying device.

9 is a schematic explanatory view of a pressure releasing means of the paper feeding mechanism of FIG.

[Explanation of symbols]

 2 Conveyor Roller 4 Elastic Roller 6 Pressure Spring 7 Sheet 10, 20 Sheet Pressure Plate 11 Paper Feeding / Conveying Device 12,17 Paper Feeding Mechanism 13A, 13B, 13C Divided Friction Member 14 Friction Resistance Holding Plate 18A, 18B, 18C Retard Rollers 19A, 19B, 19C Elastic rollers

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Nishimura 6-3-3 Shimorenjaku, Mitaka-shi, Tokyo Copier Ltd. (72) Inventor Tsukasa Teshima 6-3-3 Shimotrenjaku, Mitaka-shi, Tokyo Copy A) Incorporated (72) Inventor Naoto Mori 6-3-3 Shimorenjaku, Mitaka-shi, Tokyo Copier Ltd. (72) Inhito Akito 6-3-3 Shimorenjaku, Mitaka-shi, Tokyo Copia Co., Ltd. (72) Inventor Hidetaka Fukiharu 6-3-3 Shimorenjaku, Mitaka City, Tokyo Copier Co., Ltd. (72) Inventor Iwa Kawamura 6-3-3 Shimorenjaku, Mitaka City, Tokyo Copier Co., Ltd.

Claims (2)

[Claims] 1. A sheet feeding / conveying device for feeding / conveying a sheet by a pair of conveying bodies, wherein at least one of the conveying bodies is a cylindrical body, and the other is divided in the longitudinal direction to press the sheet. A paper feeding / conveying device comprising a pressure releasing means for releasing pressure on a part of the divided member. 2. The sheet feeding / conveying device according to claim 1, wherein the divided member is a friction resistance member having a friction resistance.