JPS61296372A - Image forming device - Google Patents

Abstract

PURPOSE:To attain a simple constitution in low cost by fitting pivotally a transfer pole and a separation one on the supporting frame of a main body and making a space between a position facing an image carrier and a position separating the carrier pivotal. CONSTITUTION:The transfer pole 5 and the separation pole 6 can be separated from a photosensitive drum 1, and an operator can easily remove an jammed paper whose top or end is positioned at a space covering from a pair of upper and lower guide plates 10a and 10b to a transporting device 22 by inserting his hands. Upon the completion of removing the jammed paper, only by releasing the pressure of a releasing lever 17a, a transfer/separation pole supporting member 17 and a transfer/separation pole block 13 installed thereon are integrally swung due to the energizing force of twist coil spring 18. Then the collating part 13a of the transfer/separation pole block 13 abuts on a stopper and is kept at the position, and the photosensitive drum 1 and the transfer and separation poles 5 and 6 are in optimum intervals. Thus the overall device and be manufactured inexpensively.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image forming apparatus, and in particular, it is possible to easily remove paper jams, so-called jams, and to perform this removal. The present invention relates to an image forming apparatus having a simple configuration.

[Background of the invention]

Generally, in an image forming apparatus such as an electrophotographic copying machine, a sheet of paper is conveyed into the main body of the apparatus, a toner image is transferred and separated, a desired image is formed on the top surface of the sheet, and the sheet is then discharged to the outside. However, after the paper has been fed, an image may be formed on the paper and the paper may become jammed, or jammed, while it is being ejected. The jammed paper must be removed as soon as possible since it will prevent smooth image formation from now on.

For this reason, generally in image forming apparatuses, in consideration of the occurrence of a jam, the portion forming the paper conveyance path can be opened, and in the event of a jam, the portion forming the conveyance path can be opened. Although these devices are designed to remove jammed paper, the mechanism for opening the conveyance path, that is, the release mechanism, requires a large number of parts. This has the problem of requiring labor and increasing the number of man-hours for assembling the material to be removed, as well as increasing the overall cost.

[Purpose of the invention]

This invention solves the above-mentioned problems, and is formed between the image bearing member and the transfer/separation pole, where there is a high possibility that a jam will occur during paper transport i5 in an image forming apparatus. The conveyance path can be opened by moving the transfer/separation pole, so that if a jam occurs in that area, it can be easily removed. An object of the present invention is to provide an image forming apparatus that can be manufactured at low cost.

[Structure of the invention]

In this invention, an electrostatic latent image formed on an image carrier is transferred to paper as a toner image by a developing device at a transfer pole and a separation pole.
In an image forming apparatus that separates, then fixes and discharges the image, the transfer pole and the separation pole are rotatably pivoted to a support frame of a main body and are opposed to the image carrier. It has a structure that allows it to swing between one position and a remote position.

[Embodiments of the invention]

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows an electrophotographic copying apparatus which is a type of image forming apparatus according to the present invention, and a charging device 2 is provided above a photosensitive drum 1 which is an image bearing member. At the forward end of the photosensitive drum 1 in the rotational direction, there is an exposure section 3;
Developing device 4, transfer pole 5, separation pole 6, cleaning device 7
A post-exposure lamp 8 and a post-exposure lamp 8 are respectively provided close to the photoreceptor drum l.

Between the developing device 4 and the transfer pole 5, there is a pair of upper and lower guide plates 1 for guiding the paper P in the paper feed cassette 9 provided on the outside.
0a and 10b are located, and a pair of upper and lower second paper feed rollers lla and 11b are located between the pair of upper and lower guide plates 10a and 10b. A paper feed roller 1 that comes into contact with the top surface of the uppermost paper and feeds it between the upper and lower guide plates 10a and 10b.
2 are arranged.

Further, as shown in detail in FIG. 2, the transfer pole 5 and the separation pole 6 are integrated at the bottom by a transfer/separation pole block 13, and this transfer/separation pole block 13 is connected from the bottom surface of the main body 14. It is attached and supported via a rail member 28 to a transfer/separation pole support member 17 whose one end is pivotally attached to the integrally projecting support 15 via a rotating shaft 16, and is wound around the rotating shaft 16. One end of the torsion coil spring 18 is in contact with the lower surface of the transfer/separation pole support member 17, and the other end is in contact with the side surface of the support body 15, so that the torsion coil spring 18 is provided on the upper surface of the transfer/separation pole support member I7. The transferred/separated pole block 13 is held in the state shown by the solid line in FIG. 1, in which the abutting portion 13a on the top surface of the tip abuts against a stopper (not shown).

That is, the transfer pole 5 and the separation pole 6 are held in positions facing the photosensitive drum 1 by the torsion coil spring 18 which is a biasing member.

Further, between the transfer pole 5 and the separation pole 6 to the fixing device 19, there is provided a conveyance device 22 in which a conveyance heald 20, which becomes lower toward the front, is stretched between rollers 21a and 21b. A guide plate 23 is also provided so that the upper part of the conveyor bell 20 protrudes.

A toner collection box 24 for storing the collected toner collected by the cleaning device 7 is provided below the conveyance device 22, and this toner collection box 24 and
A communication member 25 is provided between the cleaning device 7 and the toner collected by the cleaning device 7 via the communication member 25 to the toner collection box 2.
It is designed to be guided within 4.

Next, the operation of the above will be explained.

First, the photosensitive drum 1 charged by the charging device 2 is exposed to light to form an electrostatic latent image, and this electrostatic latent image is developed by the developing device 4 to become a toner image.

On the other hand, the uppermost sheet of paper P stored in the paper feed cassette 9 is sent out by the paper feed roller 12, waits at the second paper feed rollers lla and 11b, and is sent out at a predetermined timing. guide members 10a, 10b
When the toner image formed on the photoreceptor drum 1 is transferred to a position opposite to the photoreceptor drum 1 along the paper, the toner image formed on the photoreceptor drum 1 is transferred onto the paper by the transfer pole 5, and then separated by the separation pole 6, so that the toner image on the other side is After being conveyed by the conveying belt 20 of the conveying device 22 tilting downward, the leading edge of the sheet is guided to the fixing device 19 by the guide member 26 that directs it upward, and after being fixed by the fixing device 19, it is rotated vertically. The paper is discharged outward by a pair of paper discharge rollers 27.

Further, after the toner image has been transferred to the paper, the photosensitive drum l rotates further and reaches the cleaning device 7, and then
The residual toner is removed by the blade 7a of the cleaning device 7, and after that, post-exposure is performed using the post-exposure lamp 8, thus completing one process and waiting for the next process.

The residual toner removed by the blade 7a of the cleaning device 7 is transferred to the toner collection box 24 disposed below the conveyance device 22 via a communication member 25 that communicates the cleaning device 7 and the toner collection box 24. It falls and is stored.

During the above-mentioned operation, the paper P located in the paper feed cassette 9 is moved from the pair of upper and lower guide plates 10a, 10b to the conveyance device 22 due to, for example, the curled state of the paper. If a jam occurs, use the release lever 17a protruding from the front side of the transfer/separation electrode support member 17 and push the release lever 17a downward. The transfer/separation pole support member 17 is pivotally attached to the support body 15 via a rotating shaft 16, and the abutment portion 13a on the top surface of the tip of the transfer/separation pole block 13 provided at the top is a stopper by means of a torsion coil spring 18. Therefore, the transfer/separation pole support member 17 and the transfer/separation pole block 13 rotate in the direction of the arrow against the biasing force of the torsion coil spring 18, as indicated by the broken line in the drawing. It can be rotated to the state shown.

Therefore, by creating the state shown by the broken line in this way, the transfer pole 5 and the separation pole 6 can be separated from the light drum 1, so that the leading end or the trailing end becomes a pair of upper and lower ends. The jammed paper located between the guide plates 10a and 10b and the conveyance device 22 can be removed very easily by the operator by inserting his/her hand.

Also, when the removal of the jammed paper is completed, the release lever 17
The torsion coil spring 18 is released by simply releasing the pressure of a.
Due to the biasing force, the transfer/separation pole support member 17 and the transfer/separation pole block 13 provided above are swung upward together, and the abutting portion 13a of the transfer/separation pole block 13 comes into contact with the stopper. The photosensitive drum 1, the transfer pole 5, and the separation pole 6 are held in that position.
is the optimum interval.

〔Effect of the invention〕

By having the above-mentioned structure, this invention can separate the transfer pole and the separation pole from the photoreceptor drum with a very simple structure, and the formation between the photoreceptor drum, the transfer pole, and the separation pole. The jam can be cleared simply by opening the conveyance path for the paper that is being loaded. Moreover, if a jam occurs, the jam can be cleared by pressing downward on the member supporting the transfer pole and the separation pole. Furthermore, when the pressure is released, the transfer pole and the separation pole can be set at an optimal distance from the image carrier, and the overall cost can be reduced. be.

For example, compared to the conventional technology in which the entire conveying path, that is, the upper path of the conveying device 22 is retracted, the radius of the retracting member upon release, that is, the length mainly determined by the size of the transfer pole and the separation pole. Since it is small, a toner collection box or the like can be provided at the lower part of the conveyance path as in the present invention, and the forming apparatus becomes compact. Also, since the retracting member is small, the effort required to return to the original position can be reduced.

[Brief explanation of drawings]

The drawings show an image forming apparatus according to the present invention, in which FIG. 1 is a general schematic diagram, FIG. 2 is an enlarged view of essential parts, and FIG. 3 is a schematic layout diagram showing a conveyance device and a toner collection box. 1...Photosensitive drum 4...Developing device 5...Transfer pole 6...Separation pole 9...Paper feed cassettes 10a, 10b ...Guide plate 11a, llb...Second paper feed roller 12...
...Paper feed roller 13...Transfer/separation pole block 13a...
...Abutment portion 15...Support body 16...Rotary shaft 17...Transfer/separation pole support member 17a...
...Release lever 18 ...Torsion coil spring 22 ...Transport device 24 ...Toner collection box 25 ...Communication member 26 ...Guide Member 28...Rail member

Claims (1)

[Claims] In an image forming apparatus in which an electrostatic latent image formed on an image carrier is transferred and separated as a toner image to a sheet of paper by a transfer pole and a separation pole using a developing device, the image is then fixed and discharged. An image characterized in that a transfer pole and a separation pole are rotatably attached to a support frame of a main body so as to be swingable between a position facing the image carrier and a position away from the image carrier. Forming device.