JPH0211492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as a copying machine or a printer using electrophotographic technology, and particularly to a paper feeding device thereof.

[Prior art and drawbacks]

In conventional paper feeding devices, when paper becomes jammed in the middle of the conveyance path, the manual feed tray and paper feeding guide are opened separately to remove the jam.

However, in the conventional separate opening means, even when the paper feed guide is opened, the manual feed tray blocks the field of view, making it difficult to see inside, and it is easy to miss a piece of paper that is jammed.

Furthermore, opening both the paper feed guide and the manual feed table requires two operations, which results in a complicated operation.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional art, it is an object of the present invention to provide a paper feed device in which a manual feed tray and a paper feed guide are connected, and when one of them is opened, the other one can also be opened.

[Key points of the invention]

In order to achieve the above object, the present invention includes a manual feed tray for guiding paper toward a paper waiting section and a paper guide section having a curved concave surface, and a paper conveyor for inverting the paper and guiding it toward the paper waiting section. In the paper feeding device having a paper feed unit, by rotatably supporting the manual feed base and the paper conveyance unit, and rotating either the manual feed base or the paper conveyance unit in a predetermined direction, It is characterized by comprising a connecting means that connects the other side so that it rotates in a direction opposite to the predetermined direction.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of an electrophotographic copying machine.

Electrophotographic copying machines perform charging, exposure, development, transfer,
It consists of six basic processes: fusing and cleaning.

In the charging step, a corona discharge is performed on the photoreceptor 1 using a charging discharge electrode 2 to give a uniform electrostatic charge to the surface of the photoreceptor 1.

In the exposure process, the light reflected from the original document out of the light from the light source 3 is irradiated onto the photoreceptor 1 through the optical system.
The potential on the surface of the photoreceptor 1 is attenuated in proportion to the amount of irradiated light, and an electrostatic latent image is formed on the surface of the photoreceptor 1.

In the developing process, when a colored resin toner having a polarity opposite to that on the surface of the photoreceptor 1 is brought into contact with the developer 4, the toner adheres to the charged portion of the image carrier surface due to electrostatic force. , the electrostatic latent image becomes a visible image.

In the transfer step, the transfer discharge electrode 5 performs corona discharge to apply an electric charge of opposite polarity to the toner from the back side of the paper, thereby transferring the toner. Other than corona discharge, there is a method of applying the necessary potential to the back surface of the transfer paper using a conductive roller.

After separating the paper 19 onto which the toner has been transferred from the surface of the photoreceptor 1, it is heated to over 100 degrees by the fixing device 6.
The toner is melted and fixed on the paper 19.

The paper feeding device includes a cassette 11, a paper feeding roller 12, feed rollers 13, 14, and registration rollers 15, 1.
6, a paper conveyance section 17, and a manual feed stand 18.

The cassette 11 stores a large number of sheets of paper 19, and the top end of the paper 19 is attached to a spring 20.
is pressed against the paper feed roller 12.

The feed rollers 13 and 14 consist of a pair of feed rollers 13 rotatably attached to the copying machine body and feed rollers 14 attached to the paper conveyance section, and feed the paper 19 conveyed by the paper feed roller 12 into a register. Convey to rollers 15 and 16.

The paper conveyance section 17 includes a paper guide section 21 having a concave curved surface.
A plurality of feed rollers 14 are rotatably provided, and a manual feed roller 22 is provided on the top surface. (See FIG. 3) Also, a shaft 24 is provided on the side surface of the paper conveyance section 17.
, the rotation shaft 25, the protrusion 26, and the spring holes 27, 28.
is provided.

The manual feed stand 18 is semi-rotatably supported on the main body of the copying machine through a hole 30 provided in a flange 29, and a tip shaft 32 is erected at the tip of an arm 31 extending from the manual feed stand 18. has been done.

The paper conveyance section 17 is rotatably supported by the copying machine main body by a shaft 24 via a spring 33 whose one end is fixed in a spring hole 27. and the spring 33
is biased in a direction that prevents the paper conveying section 17 from rotating and opening.

Also, one end of the lever 35 is connected to the rotation shaft 25 by the spring 3.
4, and the other end is connected to the arm 3 of the manual feed base 18.
It is coupled to a tip shaft 32 provided at 1.

To explain the operation of the paper feed device configured as above, a large number of sheets 19 stored in the cassette 11 are separated one by one by a separating claw (not shown), and then fed out by the paper feed roller 12. . The paper 19 sent out from the cassette is changed direction by the guide section 21, is conveyed by the feed rollers 13 and 14 to the front side of the registration rollers 15 and 16, and waits there.

A sheet of paper 19 is sent out from the registration rollers 15 and 16 in synchronization with the timing of the photoreceptor 1, transferred by the transfer discharge electrode 5, fixed by the fixing device 6, and then discharged to the outside of the machine.

Now, if the paper 19 is jammed in the paper transport section 17 and a jam occurs, and you want to remove it, as shown in FIG.
5 presses down the rotating shaft 25, and the paper conveying section 17
4, it rotates against the biasing force of the spring 33 and is opened.

Conversely, when the paper conveying section is rotated and pulled out, the manual feed table 18 connected by the lever 35 is pushed up via the tip shaft 32 provided on the arm 31, and is rotated upward and released.

〔Effect of the invention〕

According to the present invention having the above configuration, when a paper jam occurs in the paper transport path, when either the manual feed table 18 or the paper transport section 17 is rotated, the other one is also opened in conjunction with the rotation.

Therefore, it is not necessary to open the manual feed tray and the paper transport section twice.

Furthermore, even if the paper conveying section is opened, the manual feed table will block the field of view and make it difficult to see inside, so that jammed pieces of paper will not be overlooked.

Furthermore, when returning to the original state, if either the manual feed tray or the paper conveyance section is returned to its original state, the other will also be returned in conjunction with this.

Therefore, it is easy to reset to the normal position after jamming.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the copying machine of the present invention, FIG. 2 is a sectional view showing its operating state, and FIG. 3 is an assembled view of the main parts of the present invention. 11...Cassette, 12...Paper feed roller, 1
3, 14...Feed roller, 15, 16...Registration roller, 17...Paper conveyance unit, 18...Manual feed stand, 19...Paper, 21...Guide unit.

Claims (1)

[Claims] 1. A manual feed table 18 and a concave curved paper guide section 21 that guide the paper toward the paper waiting sections 15 and 16.
The paper standby sections 15 and 16 reverse the paper.
In a paper feeding device that also has a paper conveyance section 17 that guides the paper toward the paper feed device, the manual feed table 18 and the paper conveyance section 17 are rotatably supported, and either one of the manual feed table 18 or the paper conveyance section 17 a connecting means 2 that connects so that when one rotates in a predetermined direction, the other rotates in a direction opposite to the predetermined direction;
5, 35, and 32.