JPH03125175A - Cleaner in electrophotographic device - Google Patents

Abstract

PURPOSE:To obtain satisfactory sealing without damaging a photosensitive body by intermittently rotating a sealing roller, and thereby regulating an am ount of cleaning agent between the photosensitive body and the magnet. CONSTITUTION:The sealing roller 17 is arranged inside a casing 10B but on the downstream side of a cleaning sleeve 10A so that it does not come into contact with the surface of the photosensitive body 6; the one magnet 17A is attached to the surface 7 of the roller 17, which faces the photosensitive body 6. The sealing roller 17, to which the magnet 17A is attached, serves to seal the surface of the photosenstive body 6 through the use of cleanining agent made of carrier formed at the front end of the magnet 17A; also the sealing roller 17 recovers carrier stuck to the surface of the photosensitive body 6, and rotates in a direction shown by an arrow when a fixed or more amount of carrier is collected at the front end of the magnet 17A. That is, the sealing roller 17 can rotate every fixed time interval during the operation of the device, or can rotate during the stop of the device. Thus, satisfactory sealing can be achieved over a long period of time without damaging the photo sensitive body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mag brush cleaning device used in an electrophotographic device such as a copying machine. Conventionally, a blade cleaning method has been mainly used as a means to clean the remaining toner image after the toner image has been transferred to transfer paper, but paper dust may accumulate on the blade.

This blade has the drawback of easily damaging the photoreceptor because carriers and the like are caught in it.

In place of this blade cleaning method, a mag brush cleaning method that does not damage the photoreceptor is used in copying machines that emphasize reproducibility of halftones.

This mag brush cleaning method uses a cleaning agent consisting of a carrier, and although the toner concentration of this cleaning agent is generally low, around 1%, toner gradually forms on the downstream side of the cleaning device, and the toner on the downstream side This may contaminate the charger grid and wires located in the area, causing image unevenness.

Further, the cleaning agent used in the mag brush cleaning device has a higher charge amount than a normal developer in order to improve cleaning performance.

Therefore, if the carrier adheres to the photoreceptor during cleaning, if the developing device includes a black developing device and a color developing device, it will be collected in the developing sleeve of the first black developing device, and the carrier will be cleaned in the black developing device. When the agent is mixed in, the amount of charge on the black developing device increases and the image density decreases. In this case, when trying to increase the image density, that is, the toner density, the amount of black toner scattering increases.

Therefore, in the mag brush cleaning device, a toner scattering prevention seal and a carrier catcher are provided downstream of the cleaning sleeve, but the toner scattering prevention seal needs to be placed close to the photoreceptor, and the photoreceptor may be damaged when the cleaning unit is attached or removed. Although it is easy to apply and the carrier catcher is effective in the initial stage, if the photoreceptor is rubbed with carrier accumulated, the surface of the photoreceptor will become dirty.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-described drawbacks of the mag brush cleaning device 1, to prevent toner and carrier from scattering from the mag brush cleaning device, and to provide a means that does not damage the photoreceptor. It is something.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a rotating cleaning sleeve with a built-in magnet that cleans toner remaining on the photoreceptor using a cleaning agent after transferring the toner image on the photoreceptor to transfer paper. In a cleaning device for an electrophotographic device, a sealing roller having a magnet arranged to face a photoreceptor is rotatably supported on the downstream side of the cleaning sleeve to regulate the amount of cleaning agent between the photoreceptor and the magnet. The present invention is characterized in that the sealing roller is rotated intermittently to achieve this.

[For production]

According to the structure of the present invention, the carrier on the surface of the photoconductor can be collected by the magnet formed on the sealing roller disposed close to the photoconductor, and the toner can be prevented from scattering, and the cleaning agent can accumulate between the photoconductor and the magnet. can be kept constant by rotating the sealing roller.

〔Example〕

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

FIG. 2 shows a color copying machine to which the mag brush cleaning device of the present invention is applied.

In a color copying machine A, a document on a document table 1 is illuminated by an illumination device 2, and the reflected light passes through a scanning mirror 3° lens 4, is separated into colors by a color separation filter 5, and is irradiated onto a charged photoreceptor 6. , to form a latent image on the surface of the photoreceptor 6.

Around the photoreceptor 6, a developing device 7. A transfer drum device 9 that transfers the toner image onto the transfer paper fed from the paper feed device 8
．． A cleaning device 10 is arranged, and the developing device 7 includes a black developing device 7A and a color developing device 7B, and the color developing device 7B consists of yellow magenta and cyan.

Then, the latent image separated into blue light is developed in a yellow developer, the latent image in green light is developed in a magenta developer, and the latent image in red light is developed in a cyan developer.
Toner images of various colors can be formed. A pre-transfer exposure section 11 is provided between the developing device 7 and the transfer drum unit W9 to lower the latent image potential and facilitate transfer. A pre-cleaning charging section 12 is provided between the transfer drum device 9 and the cleaning device 10, and uniformly charges the toner remaining on the photoreceptor without being transferred, and the remaining toner is charged by the mag brush of the cleaning device IO. It is cleaned and removed by a certain cleaning sleeve IOA. Reference numeral 13 denotes a charge eliminator which brings the potential of the photoreceptor 6 to approximately zero and starts the next image formation.

The transfer drum device 9 uses a dielectric film transfer drum, and the transfer paper fed from the paper feed device 8 is timed with the transfer drum 9 by a registration roller 14, attached to a clamper of the transfer drum, and moved to the transfer position. do.

By the action of the transfer charger 15, the toner image on the photoreceptor 6 is transferred to a transfer paper, and the transfer paper is brought into close contact with the transfer drum, and in the case of a full color copy, the transfer is repeated three to four times. When the transfer is completed, the transfer paper is separated from the transfer drum 9 by releasing the clamper, and sent to the fixing device 16, where it is fixed and a color copy is obtained.

Cleaning sleeve IOA which is a mug brush of the present invention
An embodiment of a cleaning device 10 using a cleaning device 10 is shown in FIG.

Toner remaining on the photoconductor 6 is removed from the charging section 1 before cleaning.
A cleaning sleeve IOA having a reverse polarity biased magnet is rotatably arranged in the casing IOB of the cleaning device 10, and the cleaning sleeve IOA having a cleaning agent collects the residual toner. The residual toner adsorbed on the surface of the cleaning sleeve 10A is transferred to the rotating collection roller 10C to which a high bias is applied.

A collection blade IOD is in contact with the collection roller 10C, and the residual toner is transferred from the collection roller IOC to the collection blade 1.
The toner toner is scraped off by 0D and discharged to a waste toner tank provided at the front or rear by a discharge coil 10E formed at the bottom of the casing JOB.

The cleaning agent on the cleaning sleeve 10A from which the residual toner has been removed is smoothed into a uniform layer by the doctor 10F and used again to clean the surface of the photoreceptor 6.

In the present invention, a sealing roller 17 is disposed inside the casing IOB on the downstream side of the cleaning sleeve IOA without contacting the surface of the photoreceptor 6, and a single magnet 17A is attached to the surface facing the photoreceptor 6. . The sealing roller 17 equipped with this magnet 17A performs a sealing effect on the surface of the photoreceptor 6 with a cleaning agent made of a carrier formed at the tip of the magnet 17A, and also collects the carrier attached to the surface of the photoreceptor 6 and attaches it to the magnet. The sealing roller 17 is configured to be able to rotate in the direction of the arrow when a certain amount or more of carrier accumulates at the tip of the sealing roller 17A. The sealing roller 17 can rotate at regular intervals during operation of the device or when the device is stopped.

Due to the rotation of the sealing roller 17, a certain amount of carrier accumulated at the tip of the magnet 17A is returned onto the cleaning sleeve 10A, and the carrier is returned to the cleaning sleeve 10A.
The layer thickness of the carrier, which is the cleaning agent, adhering to the surface of the cleaning casing IOB is maintained at a substantially constant level by the doctor 10G formed by protruding a part of the cleaning casing IOB.

Therefore, the magnet 17A of the sealing roller 17 is arranged to face the photoreceptor 6 at a predetermined distance, and collects the carrier on the photoreceptor 6, and the intermittent rotation of the sealing roller 17 causes the contact between the photoreceptor and the sealing roller 17. During this process, it is possible to prevent the cleaning agent from accumulating, to always form a constant layer thickness, and to achieve a good sealing effect without damaging the surface of the photoreceptor 6.

[Effect] According to the configuration of the present invention, since the sealing roller supporting a magnet is disposed close to the photoreceptor on the downstream side of the casing of the cleaning device, the cleaning agent adhering to the photoreceptor is collected, and The intermittently rotating sealing roller eliminates the accumulation of cleaning agent formed between the photoreceptor and the sealing roller, and has the effect of providing a good seal over a long period of time without damaging the photoreceptor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the cleaning device of the present invention, and FIG. 2 is a schematic sectional view of a color copying machine to which the present invention is applied. 6... Photoreceptor, 10... Cleaning device, IOA
... Cleaning sleeve, 10B... Cleaning casing, ■ 0C... Collection roller, 0F G... Doctor ■ 7... Sealing roller, 7A... Magnet.

Claims (1)

[Claims] In a cleaning device for an electrophotographic device including a rotating sleeve with a built-in magnet that uses a cleaning agent to clean toner remaining on the photoconductor after transferring the toner image on the photoconductor to transfer paper, the downstream side of the rotating sleeve To,
A sealing roller having a magnet arranged to face the photoreceptor is rotatably supported, and the sealing roller is intermittently rotated to regulate the amount of cleaning agent between the photoreceptor and the magnet. A cleaning device for an electrophotographic device.