JPS63125966A - Peeling device for copying machine - Google Patents

Abstract

PURPOSE:To prevent copying paper from being stained by a separation claw and to improve the performance of a copying machine by providing an electric feeding means which charges at least the periphery of the front end part of the separation claw to the same polarity with toner. CONSTITUTION:A separation claw support member 2 is arranged nearby the outer periphery of a photosensitive drum 1. The front end part of this separation claw support member 2 has a projecting shaft 2a and the L-shaped separation claw 4 is supported pivotally and rotatably. This separation claw 4 is made of a conductive material which is reduced in insulation resistance by adding a conductive material such as carbon to a resin material and an insulating member 3 is interposed between the shaft 2a and separation claw 4. Consequently, the separation claw support member 2 and separation claw 4 are insulated to prevent charges from moving to the separation claw support member 2. Further, the periphery of the front end part of the separation claw 4 is tapered and so arranged as to abut on the outer periphery of the photosensitive drum 1. Further, the separation claw 4 is connected to the plus electrode of a power source through a switch 6 and the switch 6 and power source 5 constitute the electric feeding means. Consequently, toner is prevented from sticking on the front end part of the separation claw.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a peeling device for a copying machine, and particularly to a peeling device for a copying machine used in an electrostatic peeling type copying machine.

[Conventional technology]

In conventional electrostatic peel-off type copying machines, when copying only once on one side of copy paper, or when copying once on both sides of copy paper, the copy paper can be easily separated from the photoreceptor drum by fJI. I can do it. However, when copying is performed more than once on one side of the copy paper, re-transfer may occur in the image area, resulting in white spots, or the copy paper may come into contact with the work 11 release claw, resulting in nail stains. Therefore, there was a problem that accurate copying could not be performed.

By the way, the above-mentioned white spots and nail stains are two sides of the same coin, and when copying more than once on one side of copy paper, if the peeling output is set to reduce white spots, nail stains will occur.
White spots will occur if the peeling output is set so that there is little fingernail dirt.Considering that white spots are not copied onto the copy paper and are a more serious problem than fingernail dirt, It is necessary to be prepared for nail stains and set the peeling output to prevent white spots.

Taking these points into consideration, as shown in Japanese Patent Publication No. 61-23554, we set a peeling output that can prevent white spots while being prepared for a certain level of fingernail stains, and also set a peeling output that can prevent white spots, and use fluorocarbon resin to which toner does not easily adhere. An electrostatic peel-off type copying machine has been proposed in which a peel-off claw is coated with .

[Problem that the invention seeks to solve]

However, in the above conventional structure, two
When copying is performed more than once and the copy paper is peeled off using a peeling nail, the problem is that although the generation of nail stains can be prevented to some extent, it cannot be completely prevented.

[Means for solving problems]

In order to solve the problem described above, a peeling device for a copying machine according to the present invention is rotatably supported by a peeling claw support member provided near the outer periphery of a photoreceptor drum, and a tip end of the peeling device is rotatably supported by a peeling claw support member provided near the outer periphery of a photoreceptor drum. A peeling device for a copying machine including a peeling claw disposed so as to be able to come into contact with the outer periphery of the toner, characterized in that the peeling device includes a power supply means for charging at least the vicinity of the tip of the peeling claw to the same polarity as the toner. .

[For production]

With the above configuration, when copying is performed on one side of copy paper two or more times and the copy paper is peeled off from the photoreceptor drum by the peeling claw, even if the paper is peeled off from the photoreceptor drum, even if it is Even if the output is set, since the peeling claw is charged to the same polarity as the toner, it is possible to prevent toner from adhering to the tip of the peeling claw.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2.

As shown in FIG. 1, a peeling claw support member 2 is provided near the outer periphery of the photosensitive drum 1. As shown in FIG.

A shaft 2a is protruded from the tip of the peeling claw support member 2, and an L-shaped peeling claw 4 is rotatably supported by the shaft 2a. The peeling claw 4 is made of a conductive material whose insulation resistance is reduced by adding a conductive substance such as carbon to a resin material, and an insulating member 3 is interposed between the shaft 2a and the peeling claw 4. . Thereby, the peeling claw support member 2 and the peeling claw 4 are insulated, and electric charges can be prevented from escaping to the peeling claw support member 2. Further, the vicinity of the tip of the peeling claw 4 has a tapered shape, and the tip 4a is arranged so as to be able to come into contact with the outer periphery of the photoreceptor drum l. Further, the peeling claw 4 is connected to the positive electrode of a power source 5 via a switch 6, and the switch 6 and the power source 5 constitute a power supply means.

In the above configuration, when the electrostatic peel type copying machine is operated, it is performed as follows.

The positively charged toner held on the surface of the photoreceptor drum 1 is transferred to the copy paper when the copy paper passes between the photoreceptor drum 1 and a transfer charger (not shown).

Then, at the moment when the leading edge of the copy paper passes, the switch 6 is turned on to charge the peeling claw 4 positively.

As a result, the peeling claw 4 is charged to the same polarity as the toner, so even if the copy paper is peeled off by the peeling claw 4, toner can be prevented from adhering to the peeling claw 4. Therefore, even if the peeling output is set to prevent white spots, it is possible to reliably prevent copy paper from becoming stained due to this.

In addition, the switch 6 is set to be turned on at the moment the leading edge of the copy paper passes, thereby preventing the toner from scattering when the copy paper with toner attached passes near the peeling claw 4. can do.

In the above embodiment, the entire peeling claw 4 is made of a conductive material, but it is not limited to such a material. For example, as shown in FIG. 2, the peeling claw 4 is formed of a non-conductive resin, and the tip of the peeling claw 4 is vapor-deposited with aluminum or plated with nickel. A power supply means is provided to form a conductive layer 7 and charge the conductive layer 7 to have the same polarity as the toner.This prevents the toner from adhering to the tip of the peeling claw 4, as in the above embodiment. can be prevented.

In this case, in consideration of the fact that the peeling claws 4 are made of resin, which is a non-conductive material, insulation between the peeling claw support member 2 and the peeling claws 4 is not required.

〔Effect of the invention〕

As described above, the peeling device for a copying machine according to the present invention is rotatably supported by the peeling claw support member provided near the outer periphery of the photoreceptor drum, and the tip portion can come into contact with the outer periphery of the photoreceptor drum. A peeling device for a copying machine having a peeling claw arranged in this manner is provided with a power supply means for charging at least the vicinity of the tip of the peeling claw to the same polarity as the toner. Therefore, even when copying is performed on one side of copy paper two or more times and the copy paper is peeled off from the photoreceptor drum by the peeling claw, it is possible to prevent toner from adhering to the tip of the peeling claw. . As a result, it is possible to prevent the copy paper from being soiled by the peeling claw, and it is possible to improve the performance of the copying machine.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing one embodiment of the present invention, respectively. 1 is a photosensitive drum, 2 is a peeling claw support member, 4 is a peeling claw,
5 is a power source, and 6 is a switch. The power source 5 and the switch 6 constitute a power supply means. Patent applicant Sharp Co., Ltd. Figure 1

Claims (1)

[Claims] 1. Peeling of a copying machine equipped with a peeling claw that is rotatably supported by a peeling claw support member provided near the outer periphery of the photoreceptor drum and arranged such that the tip end can come into contact with the outer periphery of the photoreceptor drum. A peeling device for a copying machine, characterized in that the device comprises a power supply means for charging at least the vicinity of the tip of the peeling claw to the same polarity as the toner.