JPS60144780A - Photosensitive body running device - Google Patents

Abstract

PURPOSE:To prevent a developer, paper powder, and the other dusts from being stuck to the rear face of a photosensitive body to make discrimination of sensor marks difficult, by providing a cleaning member so that it is brought into contact with the rear face is a part, which is exposed to space of the belt-shaped photosensitive body which is run in the biaxial roll running system. CONSTITUTION:An aluminum drum 5 is used as a main drum, and an aluminum roll 6 is used as a following-up roll, and a photosensitive sheet is worked into a belt, and this belt is used as a photosensitive body 7, and a sensor mark 11 is added to the rear face with a black paint by screen printing. A tension corresponding to the overall load is given to the photosensitive body 7 by a spring 9. A cover 15 is provided on the back of a brush where synthetic fur 14 is flocked on a holder 13, and this brush is attached to an inlet port 17 of a sirocco exhaust fan 16, thus obtaining a cleaning member 12. Consequently foreign matters gathered from the rear face of the photosensitive body 7 by the brush are removed to the outside of a photosensitive body running device by the exhaust fan 16, and foreign matters are not accumulated neither stuck on the sensor mark 11 on the rear face of the photosensitive body after the photosensitive body is used for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a photoreceptor traveling device for an electrophotographic recording device such as a copying machine.

Structure of conventional examples and their problems In recent years, organic photoreceptors using organic photoconductor materials have been used as photoreceptors in electrophotographic recording devices, such as plain paper copying machines, in place of selenium or sulfide domium photoreceptors. is being used. Compared to selenium or cadmium sulfide photoreceptors, organic photoreceptors have the advantage of being easy to handle for fC devices, which are intended for general users because they do not contain harmful or polluting temperature indicators. Here, a method of mounting and running the organic photoreceptor will be explained next. Typically, the organophotoreceptor has a thickness of 100 mm.
An aluminum evaporated layer of about 100X is applied to the surface of a polyester film (for example, Mylar, trade name) of about tr, and an organic photosensitive material is applied thereon to a thickness of 10 to 16 μm to form a sheet. It is wrapped around a drum and used as a photoreceptor drum, or alternatively, it is processed into an endless belt and incorporated into a two-axis roll traveling unit to be used as a belt-like photoreceptor. This situation will be explained using drawings.

FIG. 1 shows a conventional example in which an organic photoreceptor is wound around a drum. Reference numeral 1 is an aluminum drum, and a part of the cylindrical surface has a notch. Reference numeral 2 denotes a sheet-like photoreceptor whose winding end is embedded in the notch of the drum 1, fixed by a presser 3, and pulled by the force of the C-need 4 to pull the presser 3 towards the center of the drum 1. Therefore, appropriate tension is applied. In this method, the photoreceptor layer is interrupted at the notch part of the drum, so in a tilting machine, the area of the photoreceptor must be larger than the size of the copy paper, so the diameter of the drum is 160mm to 200mm. It has the disadvantage of being large in size (mm).

In order to solve this problem, the method shown in FIG. 2 has conventionally been adopted. The system shown in Figure 2 is a two-axis roll traveling system,
6 is a main drum that rotates by receiving power from a drive source (not shown); 6 is a driven roll that is disposed parallel to and fused to the main drum 6; 7l-1l: an endless belt-like roller; 8 is the seam part-9
In order to apply appropriate tension to the ID photoreceptor 7, the main drum 6
This is a spring that tensions the center axis of the driven roll 6 so as to separate it from the driven roll 6. Sensors 10 and 11 are sensor marks provided on the back surface of the photoreceptor 7, and these provide signals for controlling the timing of copying processes such as charging, exposure, and transfer.

In the method shown in FIG. 1, a cam and a microswitch are provided on the photosensitive drum to obtain a timing signal in order to obtain timing for the copying process.

However, in the system shown in FIG. 2, since there is some slippage between the drum and the photoreceptor belt, obtaining a signal directly from the drum causes a timing shift, which is not desirable. Therefore,
A sensor mark is printed and coated on the back side of the belt-shaped photoreceptor,
This is detected by a reflective phototransistor sensor, etc., and a signal is obtained.

If the configuration is as shown in FIG. 2, the diameter of the main drum 6 can be reduced and the entire photoreceptor can be flattened, so that K has a great effect on downsizing the electrophotographic recording apparatus. However, the method of FIG. 2 also has major drawbacks. Because the back side of the photoreceptor is exposed to space, the developer inside the device (
Toner, paper powder, and dust from the outside cause the sensor mark printed and coated on the back of the photoreceptor to become dirty and become undetectable, resulting in stable copying process timing. becomes impossible. This causes malfunction of the machine and makes it impossible to obtain good images. Additionally, the above-mentioned developer with warts on the back surface of the photoconductor 9 Foreign substances such as paper powder and dust can form protrusions on the surface of the photoconductor, causing the surface to lose its smoothness and, in extreme cases, protrusions to form. The photosensitive layer cracks and pinholes are formed due to stress over time, causing deterioration of the photosensitive layer and deterioration of image quality.

Purpose of the Invention The present invention prevents sensor marks provided on the back surface of a Leherto-shaped photoconductor from being contaminated with foreign matter and becoming undetectable when traveling in the 2111 four-wheel traveling system, and prevents protrusions, cracks, and pins on the photoconductor due to foreign matter. It is an object of the present invention to provide a photoreceptor traveling device that reduces image disturbance due to mechanical malfunction or deterioration of the photoreceptor by preventing the occurrence of holes and the like.

Structure of the Invention The photoreceptor traveling device f of the present invention is capable of performing necessary copying operations.
A main drum, a driven roll, which is a photoconductor support part 1 for mounting and driving a belt-shaped photoconductor having a sensor mark for generating a timing signal on its back surface, and the belt-shaped photoconductor. It is equipped with a cleaning member that comes into sliding contact with the back surface of the photoconductor, and is effective against foreign objects that can cause machine malfunctions due to misdetection of the sensor mark provided on the back surface of the photoconductor, as well as protrusions, cracks, and pinholes on the photoconductor surface. , to remove it and keep it clean.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a schematic configuration diagram of a photoreceptor traveling device according to an embodiment of the present invention. In FIG. 3, reference numeral 5 denotes a drive #, a main drum that receives power from a (not shown) drive to drive the photoreceptor, 6 a driven roll provided parallel to and isolated from the main drum, and 7 8 is a photoconductor processed into an endless belt shape, 8 is a joint part of photoconductor 7, 9 photoconductors 7V
c A spring tensioning the central axis of the driven roll 6 to separate it from the main drum 5 in order to provide an appropriate tension; 10 is a reflection type transistor sensor; 11 is a photoreceptor on the back side of the Printed and coated sensor mark,
12 is the part of the photoconductor exposed to space that is in contact with the back surface of the photoconductor VC, and the sensor mark on the photoconductor is located at sensor 1.
It is a cleaning member installed at a position before passing over the o.

In the configuration described above, an aluminum drum with a diameter of 7 mm was used as the main drum 6, and an aluminum roll with a diameter of 30 m was used as the driven roll 6. The photoconductor sort is processed into a belt shape, and the sensor mark 11 made of black paint is printed on the back side with a thickness of 3 μm using Screly printing.
'are doing. Further, a tension of 9 was applied to the total load 2 by the photoreceptor VC (c) and the spring 9.

/71J-Ning member 12VC, as illustrated in FIG.
A member attached to the intake hole 17 of No. 6 was used. Therefore, the foreign matter collected by the brush from the back surface of the photoreceptor Y is removed to the outside of the photoreceptor traveling device by the exhaust fan 16.

Under the above conditions, the photoreceptor drum part is formed, each part of the electrophotographic process based on the indirect Carlnon method is arranged around it, and the process speed (photoreceptor running speed) is 1.
A running test of plain paper copying was conducted at 40 eggs/second. As a result, no accumulation or adhesion of foreign matter was observed on the sensor mark on the back surface of the photoreceptor after 10,000 copies were made using 84-size copy paper.

Moreover, there is no malfunction due to inability to detect sensor marks or deterioration of image quality due to deterioration of the photoreceptor.75!11 For comparison, in the configuration shown in FIG. As a result of conducting a copying running test in the same manner as in the above-mentioned example, it was found that malfunctions due to poor sensor mark detection occurred after an average of about 4,000 copies, and malfunctions due to poor sensor mark detection occurred when printing 8,000 copies, and furthermore, due to poor exposure to light. Deterioration in image quality due to cracks on the body surface was observed. As a result of observation of the back surface of the photoconductor, it was confirmed that there was a considerable amount of foreign matter adhering to developer 1 paper powder. Although a synthetic bristle brush is used as a cleaning member, any material may be used as long as it can absorb foreign matter adhering to the back surface of the photoreceptor. For example, a roll covered with felt may be used. Further, it is preferable to provide the cleaning member at a location near the photoreceptor passing over the sensor, but this is not necessarily the case. As long as it is possible to make sliding contact with the back surface of the photoreceptor at the part where the photoreceptor is exposed to space, any structure is acceptable.As described in ``Effects of the Invention'', the present invention runs on a two-axis roll traveling system. For a belt-shaped photoreceptor, a cleaning member is provided so as to be in contact with the back surface of the photoreceptor in the part of the belt-like photoreceptor exposed to space, and therefore, the developer 9 paper powder and other materials are removed from the back surface of the photoreceptor. Prevents dust from adhering to the sensor mark, which is pressed down by the main drum or driven roll, becomes stuck, or becomes fixed due to the temperature inside the machine, making it difficult to identify it from the sensor mark. It is something to do. This enables stable machine operation and removes foreign matter adhering to the back surface of the photoreceptor, thereby preventing unevenness on the surface of the photoreceptor, extending the lifespan of the photoreceptor, and improving image quality. This has great effects, such as improving performance, reducing service calls, and reducing running costs.

[Brief explanation of the drawing]

1 and 2 are schematic configuration diagrams of a conventional photoconductor traveling device, FIG. 3 is a schematic diagram of a photoconductor traveling device according to an embodiment of the present invention, and FIG. 4 is a cleaning diagram used in the present invention. It is a perspective view of an example of a member. 5゛Main drum, 6゛゛゛driven roll, 7゛゛"'°゛sensing lL9" panel, 10゛sensor, 11゛...
・Sensor mark, 12...Cleaning member, 13
゛°Paper holder, 14゛°”°synthetic hair, 16°°゛°cover - 16... Exhaust fan. Name of agent Patent attorney Toshi Nakao and 1 other person. Figure 1 Figure 2 3 "・4 4th (2)

Claims (1)

[Claims] (1) A main drum and a driven roll, which are photoconductor supporting members for mounting and driving a belt-shaped photoconductor, on the back of which are provided sensor marks for generating timing signals to obtain the required copying operation. , and a photoconductor traveling device comprising: a Jung member that is in sliding contact with the back surface of the belt-shaped photoconductor. (b) The photoreceptor traveling device according to claim (1), wherein the cleaning member includes a u1i fan.