JPH0766223B2 - Electrophotographic photoreceptor belt support device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting device for supporting and rotating an electrophotographic photosensitive belt having a meandering prevention guide by at least two rollers.

2. Description of the Related Art Generally, an electrophotographic photoreceptor belt is formed by sequentially providing a conductive layer and a photosensitive layer on a surface of a belt base material which is an endless belt formed by welding a film or a seamless belt. As shown in FIG. 3, such an electrophotographic photoreceptor belt incorporates at least two rollers, that is, a driving roller 2a and a driven roller 2b, and optionally a tension roller 2c, which are rotatably conveyed by these rollers. Supported to be. The electrophotographic photosensitive member belt 1 supported in this way is biased in one direction and meanders while being continuously conveyed by rotation. Therefore, it is general that the electrophotographic photosensitive belt 1 is provided with the meandering prevention guides 3 at both end portions on the back surface thereof. However, when such a meandering prevention guide 3 is provided, there is a phenomenon that the meandering prevention guide 3 rubs against the roller 2 and the guide is scraped, and the scraps enter between the roller 2 and the belt 1 and the electrophotographic photoreceptor It may cause a crack in the. There is also a problem that the meandering prevention guide 3 rides over the edge of the roller 2 and rides on the surface of the roller 2 to cause inconvenience such as crack breakage on the surface of the electrophotographic photosensitive belt 1.

In addition, there is a considerable space inside such an electrophotographic photosensitive belt 1, and for some reason foreign matter such as toner easily wraps around the inside of the electrophotographic photosensitive belt 1, and these foreign matter and the roller 2 and electrophotography. If the electrophotographic photoconductor belt 1 is caught between the electrophotographic photoconductor belt 1 and the electrophotographic photoconductor belt 1, protrusions may be generated on the surface of the electrophotographic photoconductor belt 1.

In order to eliminate such an adverse effect, as shown in FIGS. 4 and 5, an elastic member (foamed polyurethane, silicone, etc.) is used as the coating layer 5 on the surface of at least one roller 2 among the driven rollers including tension rollers other than the driving roller. A roller coated with rubber, urethane rubber, etc.), hair, thread, cloth, etc. may be used. However, in the case of such a roller 2, when the thickness of the coating is larger than the thickness of the meandering prevention guide 3, it is difficult to eliminate the above-mentioned adverse effects.

Further, this roller 2 is a roller 2 because of the processing of the coating layer 5.
In some cases, the coating layer 5 may not be provided up to the end of the. When the electrophotographic photosensitive belt 1 is rotationally conveyed by using this, as described above, the meandering prevention guide 3 moves the roller 2
When climbing up, the meandering prevention guide 3 moves to a portion where the coating layer 5 is not provided, and the meandering becomes larger, and further, external pressure generated by a cleaning blade or the like during image copying of the electrophotographic photosensitive belt 1 is electronic. There is a problem that when the photographic photoreceptor belt 1 is loaded, the belt 1 is broken, which has a very serious adverse effect.

The object of the present invention is to solve the above-mentioned conventional problems, to sufficiently perform the function of the meandering prevention guide, and to perform good rotary conveyance, and to cover even when the roller is a coating roller. Since the meandering prevention guide does not move to the portion where the layer is not provided, the electrophotographic photosensitive belt does not break even when external pressure is applied to the electrophotographic photosensitive belt. Providing a support device.

Structure The present invention has an electrophotographic photosensitive belt, and at least two rollers for carrying and rotating the belt while supporting the belt.
A support device comprising a meandering-preventing guide for preventing the belt from meandering by being guided to the end of the roller at the back end of the belt, and at least one end or one end of the roller. Provided with a plastic washer that comes into contact with the inner side surface of the meandering prevention guide, the diameter of the plastic washer is increased beyond the diameter of the roller, and a coating layer is formed on the roller surface so as to match the exceeded range. It is characterized by being provided.

Embodiment 1 A first embodiment of the present invention shown in FIG. 1 has at least two rollers 2 for carrying and rotating the electrophotographic photosensitive belt 1 while supporting the electrophotographic photosensitive belt 1. The belt 1 is provided with a meandering prevention guide 3 which is guided by an end portion of a roller 2 to prevent the belt 1 from meandering.
At least one end or one end of the roller 2 is provided with a plastic washer 4 that comes into contact with the inner side surface of the meandering prevention guide 3, and the diameter of the plastic washer 4 is made larger than the diameter of the roller 2. The coating layer 5 is provided on the surface of the roller 2 so as to match the range beyond this.

The plastic washer 4 is normally provided on both end surfaces of the roller 2 because the meandering prevention guides 3 are provided on both end portions of the back surface of the electrophotographic photoreceptor belt 1. If is one direction, it may be provided only on one end face. Normally the plastic washer 4
Meandering prevention guide 3 made of polyester resin, etc.
Made of plastic that does not scrape (polyacetal, PB
T, nylon, etc.) is used.

In such a case, when the electrophotographic photoconductor belt 1 is rotationally conveyed, the meandering prevention guide 3 is engaged with the plastic washer 4 and rides on the roller 2 provided with the coating layer 5. Without cracks on the surface of the electrophotographic photoreceptor belt 1,
In addition, the electrophotographic photoreceptor belt 1 does not meander,
The meandering prevention guide 3 does not rub against the end portion of the roller 2 to scrape the guide, and the scraps do not enter between the roller 2 and the belt 1 to cause cracks in the electrophotographic photosensitive member.

In the second embodiment shown in FIG. 2, a concave plastic washer 4'which is in contact with the inner side surface of the meandering prevention guide 3 is fitted to both ends or one end of the roller 2 provided with the coating layer 5. By way of example, in this case, if the covering layer 5 is not provided up to the end of the roller 2, the coronal part of the end of the concave plastic washer 4 ′ is fitted on said end of the roller 2. The Rukoto.

When the electrophotographic photosensitive member belt 1 is rotatably conveyed by using such an embodiment, the meandering prevention guide 3 is fitted into the concave plastic washer 4'and rides on the roller to form the covering layer 5. The meandering prevention guide 3 does not move to a portion that is not open, and the surface of the electrophotographic photosensitive belt 1 is not cracked.
The electrophotographic photoconductor belt 1 does not meander, the meandering prevention guide 3 does not rub against the roller 2 to scrape the guide, and shavings enter between the roller 2 and the belt 1 It is said that the electrophotographic photoconductor belt 1 is not broken and the electrophotographic photoconductor belt 1 is broken even if an external pressure by a cleaning blade or the like is applied to the electrophotographic photoconductor belt 1 during image copying of the electrophotographic photoconductor belt 1. It does not have a very serious adverse effect.

Advantageous Effects of Invention According to the present invention as described above, the electrophotographic photoreceptor belt and at least two rollers that carry and rotate the belt while supporting the belt are provided, and the belt is provided with the roller at the back end portion of the belt. A support device provided with a meandering prevention guide for preventing the belt from meandering by being guided to the end of the belt, at least one end or one end of the roller being made of a plastic abutting against the inner side surface of the meandering prevention guide. A washer was provided, the diameter of this plastic washer was made larger than the diameter of the roller, and a coating layer was provided on the roller surface so as to match this range, so the meandering prevention guide rides on the roller. The electrophotographic photoconductor belt surface is prevented from cracking or breaking, and the function of the meandering prevention guide is fully exerted. There is an effect that it is possible to support the electrophotographic photoreceptor belt while carrying out good rotational conveyance without scraping.

[Brief description of drawings]

FIG. 1 is a front view of essential parts of a first embodiment of the present invention, FIG. 2 is a front view of essential parts of a second embodiment of the present invention, and FIG. 3 is a schematic explanatory view of a conventional photosensitive belt supporting device. FIG. 4 is a front view of a main portion showing a state where the meandering prevention guide has climbed up to a portion of the roller without the covering layer, and FIG. FIG. 1 ... Electrophotographic photoreceptor belt, 2 ... Roller 3 ... Meandering prevention guide 4 ... Plastic washer 4 '... Concave plastic washer 5 ... Covering layer

Claims (2)

[Claims] 1. An electrophotographic photoconductor belt, and at least two rollers that convey and rotate the belt while supporting the belt, and guide the belt to the end portion of the back surface of the belt and the end portion of the roller. In a supporting device provided with a meandering prevention guide for preventing meandering of the belt, at least one end portion or one end portion of the roller is provided with a plastic washer abutting an inner side surface of the meandering prevention guide,
An electrophotographic photoreceptor belt supporting device, wherein the diameter of the plastic washer is made larger than the diameter of the roller, and a coating layer is provided on the surface of the roller so as to match the range of the diameter. 2. The electrophotographic photosensitive belt supporting device according to claim 1, wherein the plastic washer has a concave shape.