JPH0547158Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a paper feeding device used in electrophotographic copying machines, printers, etc., and capable of feeding paper such as recording paper in a predetermined direction.

(Prior Art) In an electrophotographic copying machine, a stack of recording papers is sequentially fed into the copying machine body one by one by a paper feeding device disposed on the side of the copying machine body, and each recording paper is A copy image is formed.

In the conventional paper feeding device, as shown in FIG. 2, a paper feeding roller 22 is disposed above a leading end side portion in the paper feeding direction of a paper holder 21 on which paper such as recording paper is loaded. Paper tray 21 facing paper feed roller 22
An opening 21a is formed in a part of the opening 21a. A friction member 23 is biased by a pressure spring 25 and disposed within the opening 21a so as to come into contact with the paper feed roller 22. Further, a paper feed auxiliary roller 26 is disposed in the middle above the paper holder 21.
The paper stacked on the paper holder 21 is moved between the paper feed roller 22 and the friction member 23 by the paper feed auxiliary roller 26.
is fed to the position where it comes into contact with.

In the conventional paper feeding device, power is transmitted to the paper feeding auxiliary roller 26 and the paper feeding roller 22 from, for example, a driving source of the main body of the copying machine through respective clutches. When feeding the paper on the paper holder 21 into the main body of the copying machine, the paper feed auxiliary roller 2
With the clutch for No. 6 in the power transmission state, the paper feed auxiliary roller 26 is rotated, and the paper on the paper tray 21 is fed toward the paper feed roller 22. In this case, multiple sheets of recording paper are fed in parallel, and each recording paper is fed by the friction member 2.
5. When the leading edge of the double-fed paper reaches the position where the paper feed roller 22 is arranged, the paper feed auxiliary roller 2
The clutch for No. 6 enters the power cutoff state, and the rotation of the paper feed auxiliary roller 26 is stopped. Then, the clutch for the paper feed roller 22 is put into the power transmission state, the paper feed roller 22 is rotated, and the uppermost sheet of the multiple sheets of paper is transferred to the paper feed roller 22.
It will be sent at In this case, other sheets of paper are not fed due to the frictional force of the friction member 23. The uppermost sheet is fed into the main body of the copying machine, for example. Then, when the recording paper is conveyed to the registration rollers in the main body of the copying machine, the clutch for the paper feed roller 22 enters the power cutoff state, and the rotation of the paper feed roller 22 is stopped. Thereafter, registration rollers in the copying machine main body are rotated, and the paper is conveyed into the copying machine main body.

In this manner, power is transmitted to the paper feed roller 22 and the paper feed auxiliary roller 26 through respective clutches, and the respective rollers 22 and 26 are rotated only when transporting paper.

Further, when the paper feeding device needs to convey paper by the paper feeding roller 22 or the paper feeding auxiliary roller 26 without transmitting power to the paper feeding roller 22 or the paper feeding auxiliary roller 26 via a clutch, The paper feed roller 22 or the paper feed auxiliary roller 26 is brought into contact with the paper, and when the paper is conveyed, the paper feed roller 2
A paper feeding device has also been developed in which the paper feeding auxiliary roller 26 or the paper feeding auxiliary roller 26 is separated from the paper.

(Problems to be Solved by the Invention) As described above, the former paper feeding device requires a clutch to transmit and cut off power to the paper feeding roller 22 and the paper feeding auxiliary roller 26, and the latter The paper feeding device requires a special device to bring the paper feeding roller 22 and the paper feeding auxiliary roller 26 into contact with and away from the paper. As described above, the conventional paper feeding device has a problem in that it is not easy to assemble because it has a large number of parts and has a complicated configuration.

The present invention is intended to solve the above-mentioned conventional problems, and its purpose is to provide a paper feeding device that has a small number of parts, has a simple structure, and is highly economical.

(Means for Solving the Problems) The paper feed device of the present invention includes a paper holder on which a predetermined paper is loaded, a paper feed roller disposed near the paper holder in the paper feeding direction, a paper feed auxiliary roller that comes into contact with the paper on the paper holder and conveys the paper to the paper feed roller; and a paper feed auxiliary roller connected to the paper feed auxiliary roller so that the paper feed auxiliary roller is constantly rotated during operation. and a drive source disposed on the upper surface of the paper holder facing the paper feed auxiliary roller, and when the paper on the paper holder runs out,
The paper feeding auxiliary roller is provided with an abrasion prevention member made of a thin layer member having a small coefficient of friction, with which the outer circumferential surface of the paper feeding auxiliary roller is in rolling contact, whereby the above object is achieved.

(Example) The present invention will be described below with reference to embodiments.

The paper feeding device of the present invention is used, for example, in an electrophotographic copying machine to feed recording paper into the machine.

As shown in FIG. 1, the paper feeding device has a paper holder 11 on which a large number of recording papers are placed, and a paper feeding auxiliary roller 12 is located above the middle of the paper holder 11. It is arranged. The paper feed auxiliary roller 12 moves in the direction indicated by arrow B (clockwise direction in FIG. 1).
The recording paper placed on the paper holder 11 is fed in the direction shown by arrow A in FIG. A paper feed roller 13 is disposed above the paper holder 11 in the paper feeding direction. The paper feed roller 13 rotates in the direction of arrow C, which is the same direction as the paper feed auxiliary roller. An opening 11a is provided in a portion of the paper holder 11 facing the paper feed roller 13. A friction member holder 14 is disposed below the opening 11a. The friction member holder 14 includes a friction member placement portion 14a that is substantially horizontal below the opening portion 11a, and a portion that extends downward from the widthwise end of the placement portion 14a toward the upstream side in the paper feeding direction. It has a bracket portion 14b that extends out. The tip of each bracket portion 14b is pivotally supported below the paper holder 11. Therefore, the friction member holder 14 can swing around the tip of each bracket part 14b, and the friction member mounting part 14a is fitted into the opening 11a of the paper holder 11. Paper feed roller 1
3 and away from the paper feed roller 13. A push spring 16 is disposed below the friction member mounting portion 14 a of the friction member holder 14 , and the push spring 16 urges the friction member mounting portion 14 a toward the paper feed roller 13 . It is strong.

A friction member 15 is disposed on the friction member mounting portion 14 a of the friction member holder 14 .
The friction member 15 is made of a material with a high friction coefficient, such as urethane rubber, and is pushed through the opening 11a of the paper tray 11 by the biasing force of the spring 16, and hits the paper feed roller 13 above. are in contact with each other.

The friction member 15 extends upstream in the paper feeding direction from the friction member mounting portion 14a of the friction member holder 14, and its extending end is connected to the paper holder 1.
It is located below the peripheral edge of the opening 11a on the upstream side in the sheet feeding direction in No. 1.

A vibration prevention member 17 is disposed in the opening 11 a of the paper holder 11 . The vibration prevention member 17 is a film-like member made of synthetic resin, such as Lumirror (trade name). In this embodiment, for example, a thick film-like member 1
7a and a thin film-like member 17b are used,
The proximal end of a thin film member 17b is attached to the top surface of the thick film member 17a at its leading end in the paper feeding direction, and its leading end in the paper feeding direction extends from the thick film member 17a in the paper feeding direction. There is. A thick film-like member 17a, which is the base end of the vibration prevention member 17, is fixed to the lower surface of the peripheral edge of the opening 11a of the paper holder 11 on the upstream side in the paper feeding direction.
The lower surface of the thick film member 17 on the paper feeding direction side is in contact with the upper surface of the tip end of the friction member 15 . The tip of the thin film member 17b extending from the thick film member 17a in the paper feeding direction comes into contact with the upper surface of the friction member 15 extending upstream in the paper feeding direction from the mounting portion 14a of the friction member holder 14. There is.

The paper feed auxiliary roller 12 is connected, for example, to a drive source of the main body of the copying machine via a gear. That is, the support shaft 12 to which the paper feed auxiliary roller 12 is attached
A gear 12b is externally fixed to the end of a, and a gear 18b is meshed with the gear 12b, which is externally fixed to a connecting shaft 18a connected to a drive source in the main body of the copying machine. . Therefore, by operating the drive source, the gear 18b is rotated in the counterclockwise direction shown by the arrow D in FIG. 1, and the gear 12b meshed with the gear 18b is rotated as shown by the arrow B in FIG. rotated in a clockwise direction. As a result, the paper feed auxiliary roller 12 is rotated in the clockwise direction indicated by arrow B. The connecting shaft 18 is directly connected to the drive source without using a crack or the like, and therefore, when the drive source is in operation, the paper feed auxiliary roller 12 is constantly rotated.

On the other hand, a support shaft 13 to which a paper feed roller 13 is attached
A gear 18b is externally fitted and fixed to the connecting shaft 18.
A gear 13b that meshes with is fitted onto the outside. A paper feed clutch 13c is interposed between the gear 13b and the paper feed roller 13 on the support shaft 13a, and when the paper feed clutch 13c enters the power transmission state, the paper feed roller 13 When the paper feed clutch 13c is rotated in the direction shown by arrow C in FIG. 1 and the power is cut off, the rotation of the paper feed roller 13 is stopped.

A wear prevention member 19 for preventing the paper feed auxiliary roller 12 from being worn out is disposed on the upper surface of the paper holder 11 that the paper feed auxiliary roller 12 faces. As the wear prevention member 19, for example, a film-like member having a small coefficient of friction is used, and is adhered to the upper surface of the paper holder 11. The wear prevention member 19 is
When there is no more recording paper on the paper holder 11, the paper feed auxiliary roller 12 rolls into contact.

The wear prevention member 19 is not limited to such a film-like member, but may be formed by applying ink or the like.

In the paper feeding device having such a configuration, when the drive source of the copying machine main body is operated so that the copying operation is performed by the copying machine main body, the paper feeding auxiliary roller 12 is rotationally driven via the gears 18b and 12b. Ru. In this case, the paper feed clutch 13c is in a power cut off state and the paper feed roller 13 is not rotated. The paper feed auxiliary roller 12 is constantly rotated when the drive source is in operation, so that a plurality of sheets of recording paper placed on the paper holder 11 are fed in duplicate towards the paper feed roller 13. . The lower side of the double-fed recording paper is the thin sheet-like member 17b of the vibration prevention member 17.
and comes into contact with the friction member 15. The thin sheet-like member 17b is brought into contact with the friction member 15, which curves and extends upstream in the paper feeding direction, at an acute angle that is smaller than the curved angle of the friction member 15. As a result, the recording paper that has come into contact with the friction member 15 receives less frictional force from the friction member 15, and the paper feed roller 13
If they contact each other, it will be transported reliably.

The plurality of recording sheets that have come into contact with the friction member 15 are fed between the friction member 15 pressed by the paper feed roller 13 and the paper feed roller 13 by the pressure spring 16, and the friction member 15 The recording paper is pressed upward. As a result, the uppermost recording paper comes into contact with the paper feed roller 13. In this state, the paper feed clutch 13c
is in a power transmission state, the paper feed roller 13 is rotated, and only the uppermost recording paper is fed in a predetermined direction. The recording paper other than the uppermost one is affected by the frictional force from the friction member 15.
Not transported. In this case, there is a possibility that the friction member 15 vibrates due to the recording paper coming into contact with the friction member 15; Since it is in contact with the thick sheet-like member 17 which is the proximal end of the vibration preventing member 17, it is not vibrated.

The recording paper conveyed by the paper feed roller 13 is conveyed, for example, to a registration roller disposed in the main body of the copying machine, and in this state, the paper feed clutch 1 is
3c is brought into a power cutoff state, and the rotation of the paper feed roller 13 is stopped. The recording paper that has been conveyed to the registration rollers is conveyed by rotating the registration rollers at a predetermined timing.

In this way, when the recording paper is conveyed and there is no more recording paper on the paper holder 11, the constantly rotating paper feed auxiliary roller 12 is moved to face the paper feed auxiliary roller 12. Paper feed auxiliary roller 1 is used to roll over the wear prevention member 19 provided.
No. 2, there is no risk of the surface being worn out.

(Effect of the invention) In this way, the paper feeding device of the present invention does not require parts such as a clutch because the paper feeding auxiliary roller is constantly rotated when the predetermined drive source is driven. It has a simple structure. In addition, the paper feed auxiliary roller
Since it rolls into contact with the wear prevention member, wear on the surface of the paper feeding auxiliary roller is prevented, and there is no risk of hindrance to paper conveyance. Furthermore, since the wear prevention member is made of a thin layer and is pasted or painted on the portion of the paper holder that faces the paper feeding auxiliary roller, it does not require a large installation space. Therefore, in this respect as well, the device configuration can be simplified. Furthermore, the device configuration can be made smaller and lower in price. Furthermore,
Since the wear prevention member is made of a member with a small coefficient of friction, it does not interfere with the conveyance of the bottom paper.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the paper feeding device of the present invention, Figure 2
The figure is a sectional view of a main part of a conventional paper feeding device. 11...Paper holder, 12...Paper feed auxiliary roller,
12b, 13b, 18b... Gear, 13... Paper feed roller, 15... Friction member, 17... Vibration prevention member, 19... Wear prevention member.

Claims (1)

[Scope of Claim for Utility Model Registration] A paper holder on which predetermined sheets of paper are loaded, a paper feed roller disposed near the paper feed direction side of the paper holder, and a paper feed roller that abuts the paper on the paper holder. a paper feed auxiliary roller that conveys the paper to the paper feed roller; a drive source connected to the paper feed auxiliary roller so that the paper feed auxiliary roller is constantly rotated during operation; and the paper feed auxiliary roller. It is arranged on the upper surface of the paper holder facing the roller, and when the paper on the paper holder runs out,
A paper feeding device comprising: a wear prevention member made of a thin layer member with a small coefficient of friction, with which the outer circumferential surface of the paper feeding auxiliary roller is in rolling contact.