JPS6029776A - Curl preventing device - Google Patents

Abstract

PURPOSE:To prevent curl and obtain a clear image by providing a sliding contact body sliding contacted with the beltlike photosensitive body of an electrophotographic copying machine at both ends and running at the same peripheral speed as the beltlike photosensitive body. CONSTITUTION:A driving belt 21 which is extended among the 1st roller 2, the 2nd roller 3, and the 3rd roller 4 for driving and runs as the roller rotates runs to the direction shown by an arrow while carrying the beltlike photosensitive body 1 which is exposed by a flash optical system and is nearly as wide as the driving belt. This curl preventing device consists of a support arm 22 and a couple of detachable sliding contact bodies 23 which slide contacted with the edge of the beltlike photosensitive body 1 while supported by the arm 22. Each sliding contact body 23 consists of a sliding contact belt 26 extended between two small rollers 24 and 25, the sliding contact belt 26 runs at the same speed as shown by an arrow C accompanied with the run of the beltlike photosensitive body 1 to slide contacted with the photosensitive body 1 by its weight, and its surface is consisted of a rugged rubber belt.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a curl prevention device for a photoreceptor belt in an electronic copying machine, and particularly to a device for preventing curling of a photoreceptor belt during driving. Regarding equipment.

[Prior art]

An electronic copying machine equipped with a photoreceptor belt, that is, a belt-shaped photoreceptor, is generally shown in outline in FIG.

In this electronic copying machine, a belt-like photoreceptor 1 is moved between a first roller 2 and a second roller by a belt drive device (not shown).
The belt-shaped photoreceptor 1 is caused to run between the roller 3 and the third roller 4, and first, a charge is applied to the entire surface of the belt-shaped photoreceptor 1 by the band corotron 5. continue,
In the exposure section 6, exposure is performed using a flashlight optical system,
An electrostatic latent image is formed on the surface of the belt-shaped photoreceptor. This electrostatic latent image is made visible in the developing section 7 by attracting toner having an opposite charge. The visible image thus obtained is attached to a recording paper roll (not shown).
The recording paper 8 is superimposed on the recording paper 8 supplied from the recording paper 8, and the recording paper 8 is transferred onto the recording paper 8, which receives pressure from the transfer roll.

In this way, when the transfer is completed, the static eliminating corotron 9
As a result, the surface of the belt-shaped photoreceptor 1 is electrically neutralized, and residual toner is further removed by the fur brush 10. Finally, the surface of the belt-shaped photoreceptor 1 is completely regenerated by being irradiated by the static elimination run f11.

Then, the charging corotron 5 charges the battery, and the operation is repeated.

By the way, the photoreceptors used here include inorganic ones made of selenium, zinc oxide, etc., and organic ones made of polyN-vinylcarbazole (PVK), etc.
Particularly when organic materials are used, curls may occur at the belt edges due to slight deviations during processing into a belt shape.

If a belt-shaped photoreceptor whose edges have been curled during processing is used in the above-mentioned elongated electronic copying machine, the belt-shaped photoreceptor will be forced to run with the edges curled, especially when the flash optical system is used. When forming a wide-area image using an exposure system like this, a shift occurs in the image forming position,
There was an inconvenience that the image would fade.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to completely prevent the edges of a belt-shaped photoreceptor from lifting up and to reproduce clear images.

[Structure of the invention]

The present invention achieves the above-mentioned object by providing, at both ends of a belt drive device for causing the belt-like photoreceptor to run, sliding contact members that come into sliding contact with the belt-like photoreceptor and run at the same circumferential speed as the belt. This is what we are trying to achieve.

[Example] Hereinafter, an anti-curl device according to an example of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram of the exposure section of an electronic copying machine. Here, a drive belt is suspended from the 10th roller 2, the 20th roller 3, and the 30th roller 4, and runs with the rotation of the rollers. 21
However, in order to perform exposure using a flash optical system, a belt-shaped photoreceptor 1 having approximately the same width as the belt-shaped photoreceptor 1 is supported and moved in the direction of the arrow.

The curl prevention device of the present invention includes a support arm 22 and a pair of removable sliding members 23 carried by the support arm and slidingly contacted with the edges of the belt-shaped photoreceptor 1.

As shown in a partially enlarged sectional view in FIG. 3, this sliding body 23 consists of two small rollers 24, 25 and a sliding belt 26 suspended from these. The sliding belt 26 is made of a rubber belt having an uneven surface so that it slides against the belt-shaped photoreceptor under its own weight and runs at the same speed in the direction of arrow C as the belt-shaped photoreceptor 10 travels. .

Next, the operation of this curl prevention device will be explained.

The support arm 22 provides a first . When the two sliding contact members are brought into sliding contact with the edge of the belt-like photoreceptor that is made to run as the second and third rollers rotate, the sliding contact members slide against the edge of the belt-like photoreceptor. While holding down the
Due to the frictional force due to its own weight, it is caused to run at the same speed as the belt-shaped photoreceptor.

Incidentally, when this sliding contact member 23 is not required, it is sufficient to move the support arm and rotate it in the direction of arrow a to separate it from the belt-shaped photoreceptor.

FIG. 4 is a view of the belt-shaped photoreceptor when the curl prevention device is not used, as viewed from the direction d in FIG. 2.

FIG. 5 is a diagram showing the state of the belt-like photoreceptor when the sliding member 23 is in sliding contact with the edge of the belt-like photoreceptor and the curl prevention device is being driven.

As is clear from these comparisons, the 4'S 4a body completely prevents the edge of the belt-shaped photoreceptor from floating, so that the lh 9J produced by the flash optical system 5 is formed on a flat photoreceptor surface, resulting in a clear image. It is possible to form a structure.

In the example, a sliding contact body consisting of two small rollers and a J-7 contact belt was used; It goes without saying that the rollers may be placed in sliding contact with the edges at a distance from each other.

〔Effect of the invention〕

As described above, according to the present invention, sliding contact members are provided at both ends of the belt-shaped photoreceptor, which also slide on the surface opposite to the drive belt and run at the same speed as the drive belt. This prevents the edge of the belt-shaped photoreceptor from lifting up, making it possible to form a clear image.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an electronic copying machine equipped with a belt-shaped photoreceptor.
FIG. 2 is a schematic diagram of an exposure section of an electronic copying machine equipped with an anti-curl device according to an embodiment of the present invention, FIG. 3 is a partially enlarged sectional view of the anti-curl device according to an embodiment of the present invention, and FIG. The belt-shaped photoreceptor 1 when no curl prevention device is used: A view taken from the direction d in FIG. 2. FIG. This is a diagram seen from. DESCRIPTION OF SYMBOLS 1... Belt-shaped photoreceptor, 2.3 * 4... Roller, 5... Charging corotron, 6... Exposure part, 7...
・Developing section, 8... Note a (L 9... Static elimination corotron, 10... Fur brush, 11... Static elimination rung, 2
1... Drive belt, 22... Support arm, 23...
・Sliding contact body, 24.25...Small roller, 26...Sliding contact belt. Figure 2) ν' Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A sliding contact member that is in sliding contact with the belt-like photoreceptor at both ends of the belt-like photoreceptor of an electronic copying machine that is run by a belt drive device and that runs at the same peripheral speed as the belt-like photoreceptor; An anti-curl device characterized by an arm supporting the. (2) The curl prevention device as set forth in claim (1), wherein the sliding body comprises two small rollers and a sliding veil suspended between the two small rollers.