JPH04217520A - Paper feeder for image formation device - Google Patents

Abstract

PURPOSE:To automatically achieve press-contact movement or press-contact releasing movement of a frictional pad to a feeder roller, and to carry out the removal process of jamming through opening of the passage paper sheet without moving a paper feeder cassette by opening/closing the cover of an inserting port of the feeder cassette. CONSTITUTION:When a cover 16 of a paper feeder cassette inserting port is opened, a driven member 14 is moved by a driving member 18 interlocking with the movement of the cover 16, and a frictional pad 6 is separated from a feeder roller 5. When the cover 16 is closed, the frictional pad 6 is automatically pressed to the feeder roller 5 due to the operation of an elastic member 15. The process of jamming of paper sheets can be achieved without detaching a feeder cassette 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for image devices such as copying machines and printers.

0002

[Prior Art] Conventionally, image forming apparatuses, such as copying machines,
Generally, a paper feed cassette is attached to feed paper to an image forming section.

[0003] In conventional paper feeding devices, installation of a paper feeding cassette,
In conjunction with the detachment operation, a frictional separation member for preventing double feeding is pressed against or released from pressure against the paper feed roller provided in the image forming apparatus main body, thereby preventing paper from being fed into the image forming apparatus main body or jammed. Paper was being removed. Therefore, if a paper jam occurs near the paper feed section, the jam cannot be cleared unless the paper feed cassette is removed from the main body of the image forming apparatus.

0004

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a paper feed device for an image forming apparatus that allows the removal of jammed paper to be easily carried out without removing the paper feed cassette. The challenge is to do so.

[0005]

[Means for Solving the Problems] The present invention solves the above-mentioned problems by providing a paper feed cassette that is removably attachable to the main body of an image forming apparatus, a paper feed roller provided in the main body, and a paper feed roller that is in pressure contact with the paper feed roller. In a paper feeding device of an image forming apparatus having a friction pad for preventing double feeding, the friction pad is rotatably supported by the main body, and is biased with a pressing force toward the paper feeding roller by an elastic member; and the driven member is fixed;
A cover rotatably supported to open and close the insertion opening of the paper feed cassette of the main body, and a drive member provided on the cover, and the drive member and the driven member engage when the cover is opened. The problem has been solved by a paper feeding device of an image forming apparatus characterized in that the friction pad is moved away from the paper feeding roller against the elastic member.

[0006]

According to the present invention, when the cover of the paper feed cassette insertion slot is opened, the drive member moves the driven member in conjunction with the movement of the cover, and the friction pad is separated from the paper feed roller. When the cover is closed, the friction pad is automatically pressed against the paper feed roller by the action of the elastic member. Therefore, it is now possible to handle paper jams without removing or attaching the paper feed cassette.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained based on the embodiments shown in the drawings.

In FIG. 1, the paper feeding device is a paper feeding cassette 1.
has. A plurality of paper feed cassettes 1, for example, two in the example shown in the figure, are arranged one on top of the other, and are configured to be detachable from the right side of the figure.

Paper 2 is placed in the paper feed cassette 1 . A bottom plate 3 on which at least a portion of the paper 2 is placed is formed to be tiltable, and is pushed up by the action of a spring 4 such as an elastic member such as a coil spring or a leaf spring.
is pressed against. A friction pad 6 is pressed against the paper feed roller 5, and the uppermost sheet 2 in the paper feed cassette 1 is passed between the paper feed roller 5 and the friction pad 6, and double feeding of sheets is prevented by the frictional action. Ru.

The paper fed by the paper feed roller 5 is sent to the registration roller 8 through the feeding path 7, and is fed by the registration roller 8 in synchronization with the movement of the electrostatic latent image on the photoreceptor 9, and then transferred to the transfer device. 10, the toner image is transferred from the photoreceptor 9 to the paper 2.
transcribed into.

After the transfer, the paper is fixed by a fixing device 11 and discharged to a paper discharge tray by a paper discharge roller 12. After the transfer, the photoreceptor is cleaned, and then charging, exposure, development, and image formation are repeated again.

As shown in FIG. 2, the paper feed roller 5 is rotatably supported by the frame of the image forming apparatus and driven. The friction pad 6 is rotatably supported on the machine frame by a fulcrum 13. An arm member 14 as a driven member is attached to the friction pad 6, and an elastic member 15, such as a spring, is tensioned between the arm member 14 and the machine frame, and the friction pad 6 receives a force that presses against the paper feed roller 5. is energized.

A cover 16 that opens and closes an insertion opening for the paper feed cassette 1 of the paper feed device is rotatably supported by a support shaft 17. The cover 16 has a projection member 18 as a driving member.
are fixed or integrally formed.

When the cover 16 is opened, the protruding member 18 comes into contact with the arm 14 as shown in FIG. It is moved in the direction away from the contact, and the pressure contact is released. In this state, the space between the paper feed roller and the friction pad 6 is opened, so paper can be taken out freely and jammed paper can be easily removed.

When the cover 16 is closed, the projection member 18 is released from contact with the arm portion 14, and the friction pad 6 returns to the state of being pressed against the paper feed roller 5 by the force of the spring 15.

In the variant shown in FIGS. 4 and 5, the driving member is formed as a sector gear 20 instead of the protruding member 18, the driven member is formed as a sector gear 19 instead of the arm 14, and the sector gears 19 and 20 are They can interlock with each other within a predetermined range of motion.

When the sector gear 20 as a driving member reaches a predetermined position when the cover 16 is opened, it meshes with the sector gear 19 as a driven member and rotates the friction pad 6 against the force of the spring 15. , the pressure contact with the paper feed roller 5 is released. When the cover 16 is closed, the friction pad 6 is rotated to a pressure contact position with respect to the paper feed roller 5 due to the meshing of the sector gears 19 and 20.

[0018]

Effects of the Invention: By opening and closing the cover of the insertion slot of the paper feed cassette, the friction pad can be automatically pressed against or released from the paper feed roller. It is now possible to remove jams by opening the passage.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram of a printer using a paper feeding device according to the present invention.

FIG. 2 is an explanatory diagram of the vicinity of the paper feeding roller of the paper feeding device.

FIG. 3 is an explanatory diagram of the pressure release movement of the friction pad in the example of FIG. 2;

FIG. 4 is a diagram corresponding to FIG. 2 of another example.

FIG. 5 is a diagram showing the friction pad in the example of FIG. 4 when the pressure contact is released;

[Explanation of symbols]

1 Paper cassette 2 Paper 5 Paper feed roller 6 Friction pad 14 Arm (driven member) 15 Elastic member 16 Cover 18 Projection member (driving member) 19 Sector gear (driven member) 20 Sector gear (driving member)

Claims (3)

[Claims] 1. An image forming apparatus comprising: a paper feed cassette that is removably attached to an image forming apparatus main body; a paper feed roller provided on the main body; and a friction pad for preventing double feeding that is pressed against the paper feed roller. In the paper feed device, the friction pad is rotatably supported by the main body, is biased with a pressing force toward the paper feed roller by an elastic member, and has a driven member fixed; has a cover that is rotatably supported to open and close the insertion opening of the paper feed cassette, and a drive member provided on the cover, and when the cover is opened, the drive member and the driven member engage with each other to cause the A paper feeding device for an image forming apparatus, characterized in that a friction pad is moved away from and removed from the paper feeding roller against the elastic member. 2. The paper feeding device for an image forming apparatus according to claim 1, wherein the driving member is a protruding member and the driven member is an arm member that abuts the protruding member. 3. The paper feeding device for an image forming apparatus according to claim 1, wherein the driving member and the driven member are formed by sector gears that can mesh with each other.