JPH02123384A - Image forming device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an image forming apparatus that forms a toner image on plain paper using an optical image as a signal.

[Conventional technology]

Conventionally, in this type of image forming apparatus, a photoreceptor drum is held by several rollers located on its outer periphery.
Separately, a pressure transfer roller was provided. However, nothing was placed on the inner surface of the photosensitive drum facing the pressure transfer roller.

[Problem to be solved by the invention]

In the conventional method described above, no roller was placed on the inner surface of the photoreceptor drum facing the pressure transfer roller.
When pressure is applied by the transfer roller, especially when the pressure is large, there is a fear that the photosensitive drum may vibrate and move slightly, causing disturbances in the image.

The present invention was made to solve the above problems, and an object of the present invention is to provide an image forming apparatus that is not affected by the pressure of a pressure transfer roller.

[Means to solve the problem]

The image forming apparatus according to the present invention is provided with several support rollers that rotatably support the photoreceptor drum from inside, and one support roller is arranged on the inner surface of the photoreceptor drum at a position facing the pressure transfer roller. It is.

(Function) In this invention, when the pressure of the pressure transfer roller is applied to the photoreceptor drum, one of the support rollers inside the photoreceptor drum receives the pressure, so the photoreceptor drum is not affected by the pressure.

〔Example〕

FIG. 1 is a schematic side cross-sectional view showing the configuration of an embodiment of the present invention, and FIG. 2 is a perspective view showing the relationship between the main parts of FIG. 1. In these figures, 10 is a main body, inside which a latent image carrier unit 20. Developing section 30. Transfer section 40. Fixing section 50° Paper feeding section 60. A cleaning section 70 is provided.

Hereinafter, each of the above parts will be explained in order.

The latent image carrier unit 20 is constructed by integrating an optical printer head 21, which is an optical device, and a photosensitive drum 29. The optical printer head 21 is composed of a large number of linearly arranged LED chips 22 and a convergent light transmission member 23 extending parallel to the LED chips 22 .

Side plates 24A are provided on both sides of the optical printer head 21.

24B is attached, and a plurality of shafts (three in the figure) 25 are fixed between the side plates 24A and 24B, and support rollers 26 are rotatably provided at both ends of these shafts 25 near the side plates. . A mounting piece 24a is integrally formed on the side plate 24A, and can be fixed to the chassis 11 of the main body 10 through a long hole 24b. Furthermore, the side plate 24
A, on the outer surface of 24B, a fulcrum pin 27. A guide pin 28 is fixed (note that the bin 27 on the side plate 24B is not visible).

The photoconductor drum 29 is formed by laminating a transparent conductive layer and a photoconductor layer on a transparent base, and the above-described optical printer head 21 is inserted inside the photoconductor drum 29, and each support roller 26 is attached to the photoconductor from the inside. The drum 29 is rotatably supported. One of the support rollers 26 is provided at a position facing a pressure transfer roller 41, which will be described later. In addition,
The support rollers 26 may be provided not only on both sides of the shaft 25 but also at the center thereof.

The developing section 30 includes a magnet roller 32 . Ear standing regulation plate 34. A stirring screw 35 and the like are provided.

The housing 31 has a protrusion 36, and a coil spring 37 is stretched between the protrusion 36 and the protrusion 12 provided on the chassis 11 of the main body 10.
The latent image carrier unit 20 is pulled toward the latent image carrier unit 20 by.

Reference numeral 13 denotes a positioning member, and as clearly shown in FIG. 2, a recess 13a is formed in the end surface on the side of the developing section 30, into which the magnet roller shaft 33 of the magnet roller 32 is fitted. On the opposite side of the recess 13a, there is a recess 1 into which the fulcrum pin 27 of the latent image carrier unit 20 is fitted.
3b, and a recess 13c into which the guide pin 28 is similarly fitted,
A guide port 13d is formed continuously. A hole 13e is formed for attachment to the chassis 11 or the like of the main body 10 with screws or the like. Reference numeral 14 denotes a drive roller for rotating the photosensitive drum 2.

FIG. 3 is a diagram illustrating how the positioning member 13 is installed. The fulcrum pins 27 of the side plates 24A and 24B are fitted into the recesses 13b of the left and right positioning members 13, respectively, and the guide pin 28 is fitted into the recess 13c. Both side plates 24A, 24
B is fixed to the chassis 11 using a long hole 24b and a screw 24c. At this time, the installation is performed by aligning the pointer 24d at the tip of the piece 24a with the scale 15 on the chassis 11, rotating about the fulcrum pin 27, and moving the guide pin 28 into the recess 13c.
By moving the latent image carrier unit 20 along the vertical direction, the latent image carrier unit 20 can be finely adjusted in the vertical direction.

On the other hand, when the magnet roller shaft 33 is inserted into the recess 13a, it is pushed in the direction of arrow A by the coil spring 37 (FIG. 1), so that the positioning member 13 eventually causes the magnet roller 32 and photoreceptor drum 29 to be connected to each other. The interval, that is, the development gap, is automatically constant.

The transfer unit 40 is configured such that a pressure transfer roller 41 is rotatably supported around a support shaft 42 . 43
is a guide plate, which is configured to lightly suck the unfixed toner on the paper passing through the guide plate using a suction fan 44 so that it does not get disturbed by rubbing. 45 is a separation claw.

The fixing unit 50 has a halogen lamp of about 850 W installed inside, and is composed of a rotationally driven heating roller 51 and a pressure roller 52 that is in pressure contact with the heating roller 51.
A felt 53 impregnated with silicone oil is provided below the heating roller 51 so as to be pressed by the heating roller 51. 54 is a separation claw, and 55 is a pair of paper discharge rollers.

The pressure roller 52 of the transfer section 40 and fixing section 50
A portion including the driven side (upper side in the figure) roller of the paper ejection roller pair 55 is formed into a unit, and is configured to be able to swing counterclockwise about the support shaft 46 .

The paper feed section 60 includes a paper feed cassette 61, a paper feed roller 62,
It consists of a register roller pair 63 consisting of a drive roller connected to a motor and a rotatable driven roller that is in pressure contact with the drive roller.

The cleaning section 70 includes a cleaning blade 71, and the toner remaining on the photosensitive drum 29 that has not been transferred by the pressure transfer roller 41 is removed by the cleaning section 70. 80 indicates paper.

Next, the operation will be explained.

Magnet roller 32 and photosensitive drum 29 of developing section 30
A voltage is applied between the photosensitive drum 29 and the transparent conductive layer of the photosensitive drum 29.
Image information is irradiated by the optical printer head 21 and the convergence light transmitter 23 arranged on the inner surface of the photoreceptor drum 29, and a toner image is formed on the corresponding surface of the photoreceptor drum 29.

On the other hand, the paper 80 fed by the paper feed roller 62 is conveyed to the transfer position by the register roller pair 63 after being timed by the register roller pair 63 . In the transfer section 40 , the pressure transfer roller 41 is rotated about the support shaft 42 , and the paper 80 is pressed between the photosensitive drum 29 and the pressure transfer roller 41 to transfer the toner image onto the paper 80 . The paper 80 with the toner image transferred thereto is separated by the separating claw 45.
The image is separated from the photoreceptor drum 29 by the pressure transfer roller 41 and the photoreceptor drum 29, and further conveyed to the fixing section 50. The paper 80 to which the toner image has been transferred in the fixing section 50 is heated and pressed by a heating roller 51 and a pressure roller 52 to fix the toner image, and is separated by a separating claw 54.
Further, the paper is ejected by a pair of paper ejection rollers 55.

(Effects of the Invention) As described above, in this invention, one of the plurality of support rollers is disposed at a position facing the pressure transfer roller via the photoreceptor drum, so that the photoreceptor drum of the pressure transfer roller Since one of the support rollers receives the pressure on the transfer roller, a stable image can be expected without image disturbance caused by the separation and separation of the pressure transfer roller.

[Brief explanation of drawings]

FIG. 1 is a schematic side sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view showing the main part of FIG. 1, and FIG. 3 is an explanatory view of the state in which the positioning member is attached. In the figure, 10 is the main body, 11 is the chassis, 12 is the protrusion, 20 is the latent image carrier unit, 21 is the optical printer head, 22 is the LED chip, 23 is the convergent light transmitter, 24A, 24B
is a side plate, 25 is a shaft, 26 is a support roller, 27 is a fulcrum pin, 28 is a guide pin, 2 are photosensitive drums, 30 is a developing section, 31 is a housing, 32 is a magnet roller, 33 is a magnet roller shaft, 34 is a spike regulating plate, 35 is a stirring screw, 36 is a protrusion, 37 is a coil spring, 40 is a transfer part,
41 is a pressure transfer roller, 42 is a support shaft, 50 is a fixing section,
51 is a heating roller, 52 is a pressure roller, 53 is a felt, 54 is a separation claw, 55 is a pair of paper ejection rollers, 6o is a paper feed section,
61 is a paper feed cassette, 62 is a paper feed roller, 63 is a register roller pair, and 80 is paper.

Claims (1)

[Claims] A photoconductor drum having a transparent conductive layer and a photoconductor layer laminated on a transparent substrate, a plurality of support rollers rotatably supporting the photoconductor drum from the transparent substrate side, and a plurality of support rollers selected from the transparent substrate side. A transfer device comprising: an optical device that irradiates light, a developing section that is disposed opposite to the optical device via the photosensitive drum, and a pressure transfer roller that transfers the toner image formed on the outer surface of the photosensitive drum onto paper. 1. An image forming apparatus comprising a plurality of supporting rollers, wherein one of the plurality of support rollers is disposed at a position facing the pressure transfer roller with the photosensitive drum interposed therebetween.