JPH036582A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To reduce the size of the electrophotographic device by providing a transfer and fixation pressing member which has a function for transferring a developer on a photosensitive body to a form and a pressing function for fixing the form after the transfer. CONSTITUTION:The electrophotographic device is provided with the member 7 which has the function for transferring the developer 5 on the photosensitive body 1 to the form 8 and the pressing function for fixing the form 8 after the transfer. Namely, a roller 7 applies slight pressure to the photosensitive drum 1 at a transfer part with the form 8, so the adhesive strength between the photosensitive body and form is improved and transfer efficiency is improved as compared with a corona transfer method which uses a corotron, etc. Thus, the member is so constitute as to serve as both a transfer roller and a pressure roller for fixation, and consequently the transfer efficiency is high, so the need for a cleaning mechanism is eliminated and the device is reduced in size.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an apparatus using electrophotography.

[Conventional technology]

Conventionally, an electrophotographic apparatus has a photoreceptor 1, as shown in FIG.
A charger 2 uniformly charges the surface of the photoreceptor, an optical writer 3 exposes the charged photoreceptor to create an electrostatic latent image, and a developer 5 is applied to the electrostatic latent image on the photoreceptor. a developing device 4 for depositing the developer on the photoreceptor, a transfer device 9 for transferring the developer on the photoreceptor onto the paper 8 conveyed from the paper feed mechanism, and a cleaner device 1 for cleaning the developer on the photoreceptor that has not been transferred.
0 and a fixing device 6.7 for fixing the developer transferred to the paper, and processes other than the fixing device 6.7 are arranged on the circumference of the photoreceptor.

[Problem to be solved by the invention]

However, as mentioned in 5 above, since the fixing device is not arranged on the circumference of the photoreceptor, the overall size of the electrophotographic process is increased. A pressure transfer method has also been considered in which recording paper is placed over the toner image on the photoreceptor drum, a pressure roller is pressed against it, the toner is rubbed into the fibers, and the toner is fixed at the same time as the transfer, but this method requires considerable pressure. As a result, a hard photoreceptor drum is required, and the fixing performance is weak.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide an electrophotographic apparatus that can be downsized and have strong fixing properties.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and the first invention, an electrophotographic apparatus, has a function of transferring the developer on the photoreceptor to paper, and a function of transferring the transferred paper to the paper. The structure includes a member that also has a pressurizing function for this purpose.

Further, in the second invention, conductive silicon is used on the surface of the member.

Furthermore, in the third aspect of the invention, a gap is provided between the member and the photoreceptor.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows a specific example of the present invention, in which 1 is a photoreceptor, 2 is a charger that uniformly charges the surface of the photoreceptor, and 3 is a liquid crystal that exposes the charged photoreceptor to create an electrostatic latent image. A shutter optical writer, 4 a developing device that attaches developer 5 to the electrostatic latent image on the photoconductor, 6 a heat roller 7 that fixes the developer transferred to the paper 8, and a transfer unit that attaches the developer 5 to the electrostatic latent image on the photoconductor; This is a transfer/fixing pressure roller that transfers the developer onto paper, adsorbs and conveys it to the paper's heat roller, and applies pressure from the back side of the print. In the transfer section, the roller applies a slight pressure to the photoreceptor drum 1 via the paper 8, so that the adhesion between the photoreceptor and the paper is improved, and the transfer efficiency is improved compared to the corona transfer method using a corotron or the like.

By adopting a structure in which the transfer roller and the fixing pressure roller are combined in this way, there is no need for a transfer device like that of conventional electrophotographic devices, and the high transfer efficiency eliminates the need for a cleaning mechanism, and the fixing process can be transferred to the photoreceptor. Since they can be arranged around the circumference, the device can be made smaller.

In addition, if the developer is transferred by applying an electric or magnetic field to the transfer roller, there is no need to apply large pressure to the photoreceptor drum, so there is no need for a hard photoreceptor drum. Good too. When transferring using an electric field, using a conductive member on the surface of the pressure roller will improve the electric field strength between the photoreceptor and the transfer roller, resulting in good transfer characteristics. Then, it is preferable to use conductive silicon on the surface of the transfer/fixing pressure roller.

Further, in order to prevent the rise in temperature of the transfer/fixing roller due to heat fixing from having an adverse effect on the photoreceptor, it is preferable to provide a gap between the roller and the photoreceptor when there is no transfer paper. If transfer paper is present, this gap will not affect the transfer characteristics since it will be filled with paper and some pressure will be applied from the roller.

〔Effect of the invention〕

As explained above, in the present invention, an electrophotographic apparatus can be miniaturized by having a member that has both the function of transferring the developer on the photoreceptor to paper and the function of applying pressure to fix the transferred paper. is possible.

[Brief explanation of drawings]

The first figure is an explanatory diagram showing a specific example of an electrophotographic apparatus using the present invention, and the second figure is an explanatory diagram showing a conventional electrophotographic apparatus. 1... Photosensitive drum, 2... Charger, 3... Liquid crystal shutter optical writer, 4...
...Developer, 5...Developer, 6...Fixing roller 7...Transfer/fixing pressure roller 8...
Paper, 9...Transfer device, 10...Cleaning device. Figure - Figure 2nd row

Claims (3)

[Claims] (1) In an electrophotographic device equipped with at least a photoreceptor, a charger, an optical writer, a developer, and a fixing device, the function is to transfer the developer on the photoreceptor to paper, and to fix the transferred paper. An electrophotographic device characterized by being equipped with a transfer/fixing pressure member that also has a pressure function. (2) The electrophotographic apparatus according to claim 1, wherein the transfer/fixing processing member uses conductive silicon on its surface. (3) The electrophotographic apparatus according to claim 1, wherein the transfer/fixing processing member is rotatably arranged with a gap between it and the photoreceptor.