JPS58111077A - Cleaning device - Google Patents

Abstract

PURPOSE:To improve stable cleaning effect without environmental influence and to prevent the staining of a fur brush with toner, by providing the conductive fur brush grounded through a nonlinear resistance element. CONSTITUTION:Residual toner sticking to the surface of a rotating drum 3 is moved to the brush fiber 91b of the fur brush 91 and further moved electrostatically to a rotating recovery roll 93. A voltage is applied to the recovery roll 93, and a varistor 92 as a nonlinear resistance element is grounded at one terminal and connected to the brush 91 at the other terminal to specify the value of the potential of the brush fiber 91b, holding potential differences between the brush fiber 91b, and photoreceptor 3a and recovery roll 93 constant respectively. Consequently, mutual toner attracting force becomes nearly constant and the toner is recovered to the recovery roll 93 securely without being influenced by the humidity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for an electrostatic recording device that can always provide a stable cleaning effect without being influenced by the environment.

Static IIE represented by electrophotographic copiers and 7-axis machines [
In a single-image recording device, a static latent image of a KFIL document or electrical information is formed on a photoreceptor or dielectric material by reflected light or electrical information signals obtained by exposure scanning of a document, and the electrostatic latent record is developed. This visible image is transferred to recording paper and then fixed to form a recorded image. Figure 1 shows the schematic configuration of a conventional electrophotographic copying machine, and the arrow (refresh line)
The illumination lamp 2 irradiates the Suika G placed on the IQ moving in the direction, and the reflected light from the Gen G is rotated in the direction of the arrow t'E) 1141 onto the photoreceptor 3a of the rotating drum 3. The electrostatic charge f# of original G is projected onto the photoreceptor 3a! On the chest side of the 6° rotating drum 3 that casts an image, there are a plate 4 for uniformly charging the photoreceptor 3, a developing device 5, a transfer pole 6, and a separation 11.
Turtle removal turtle-8 and cleaning device w11G (7-a-brush type) are arranged in sequence. The electrostatic latent image is developed into a visible image by a developer 41 s, and the visible image is transferred by a recording paper PK transfer mechanism @ 6 fed by a conveying device @ 11 from a paper feeding device 11 o such as a cassette. Ru. After being transferred, the recording paper P is separated from the photoreceptor 31 by the separation electrode 7, and transported to the fixing device 1BK@ by the conveyance device [12], where it is fixed and ejected to the paper ejection tray 144C. 31 can be used again, it is necessary to remove the charge and toner remaining on the surface of the photoreceptor 3m after the transfer process in the series of electrophotographic processes described above, and the residual charge is removed using a static elimination electrode. 8, and the residual toner is removed by a cleaning device fl19.

Cleaning devices used in electrophotographic V machines are well known, such as a brush type, a blade type, and a magnetic brush type. The fur brush type continuously rotates a fur brush made of rabbit or other animal hair or synthetic l11m to remove the toner remaining on the surface of the photoreceptor, and to remove the toner adhering to the fur brush so that it comes into contact with the fur brush.
This is a method in which the toner is removed with a toner removal plate (called a 7-ton cartridge), the removed toner is vacuum-sucked or sucked with an Azone, and then collected with a filter. The blade method removes residual toner by pressing a blade made of elastic synthetic resin against the surface of the photoreceptor. On the other hand, in the magnetic brush type, a non-magnetic cylindrical sleeve in which groups of '66h with different polarities are arranged alternately is provided close to the surface of the photoreceptor 11, and the carrier is attracted to the cylindrical sleeve and rotated, or a group of magnets is used. (b) This is a method in which the toner remaining on the photoreceptor surface l1 is adsorbed and removed by rolling, and the toner on the sleeve surface is scraped off with a blade or the like and collected. 1M in recent years! As the number of photographing machines became higher and the number of coupled photoreceptor movements increased, the blade method was no longer able to perform sufficient leaning, so the fur brush method was used in high-performance photographic machines for one hour. In addition, the fur brush does not press down on the surface of the photoreceptor, especially the selenium drum, like a blade, so it does not scratch the surface of the photoreceptor, and it does not allow heavy, fine solid matter to adhere to the blade and cause scratches, extending the life of the photoreceptor. It has the advantage of being able to be For these reasons, a seven-brush type cleaning device tends to be used favorably.

In conventional fur brush cleaning @all,
7 Rotate the ar brush at high speed so as to rub the surface of the photoconductor to clean the surface of the photoconductor Kl! i! The remaining toner is wiped off, and the toner adhering to the brush fibers is brushed off with a 7-liter carper that is placed in contact with the brush fibers. However, using a fan to suck up the toner requires a large space, so instead, an electrically biased member (hereinafter referred to as "collection roller") is brought into contact with the brush fibers of the fur brush. The toner adhering to the brush fibers is then electrically fixed on the collection roller and scraped off by a toner scraping blade provided in contact with the collection roller (for example, No. 49-20227).

In this type of 7-brush cleaning device that uses a collection roller, toner adhering to the brush Ij is electrostatically adsorbed to the brush fibers using the main friction charging tube of the brush fibers of the fur brush. However, since the electrostatic adhesion between the brush fibers and the toner on the surface of the photoreceptor is relatively strong, the cylindrical material attached to the brush fibers is not completely removed from the collecting roller. The toner fuses to the brush fibers and sticks to them, and the brush fibers get dirty with the toner, causing a v$it-like l&
The adhesion force may be weakened, making it impossible to obtain a stable cleaning effect. On the other hand, since brush fiber fists do not receive the 11:s of mechanical strength, the charged potential of brush fibers changes greatly depending on the environment, and at high temperatures, the brush fibers become small and sufficient. There are times when a leaning moving bed cannot be obtained.

Therefore, instead of insulating brush fibers, conductive brush a
A method of applying electric potential to the brush fibers using a lithium-ion fiber is considered, but in this case, the state of the toner attached to the brush fibers and the contact state of the brush I & koji with the collection roller are not always constant, so the brush The electric potential of the fibers may change and a stable cleaning effect may not be obtained.
The present invention has been made in view of the above points, and the powder developer remaining on the image forming support such as the photoconductor or '#s11 body is cleaned using a fur brush, and the powder developer adhered to the fur brush is cleaned. A cleaning device for collecting powder developer with an electrically biased p-ra, in which a fur brush is formed as a conductive brush, and the conductive brush is grounded through a non-II type resistive element. It is.

By doing this, you can use %I without being affected by environmental engravings.
A stable cleaning effect can be obtained, and toner stains on the fur brush can be reduced.

The present invention will be explained below based on the drawings.

FIG. 2 shows the fur brush type leaning i! according to the present invention.
! Outline showing the composition of wrinkles &! 3 is a photoreceptor 3at
- A 6-rotation drum that makes a sound, 8 is the exception IIl [w pole, 9 is a cleaning device. The cleaning device 19 has a brush core 9
Conductive brush fibers 91b made by mixing carbon etc. with synthetic fibers 1a and its chest circumference [A fur brush 91 is implanted and rotated by a motor M1;
1 [6 non-m-type resistive element, such as a varistor 92, which is connected and the other end is grounded; a conductive recovery roller 93 to which a voltage is applied from armature E and rotated by a motor M2; and a recovery roller. The toner scraping blade 94 provided in contact with the toner scraping blade 93 and the toner scraping blade 94 have a 6° If a voltage of 600 cm is used without depending on the voltage, the varistor 92 is supplied with m
The electric potential of the brush fibers 91b becomes constant at 600V, and therefore the potential difference between the brush fibers 91b and the photoreceptor 31 is 600㎜, which is 6°. The potential difference will be 400v.

□ K removes toner with such a device by rotating the fur brush 91 at high speed in the direction of the arrow so as to rub the rotating 761g drum 3 in the direction of the arrow to remove the toner attached to the surface of the photoreceptor 3a. is electrostatically adhered to the brush fibers 91b, and the attached toner is electrostatically transferred to the collection p-ra 93 which comes in contact with the brush fibers 91b and moves in the direction of the arrow. Scrape it off.

As described above, in this embodiment, by connecting the varistor 92 to the fur brush 91, the electric potential of the brush fibers 91b is kept at a predetermined constant value, and the electric potential difference between the brush wIi#91b and the photoreceptor 3a and the brush IIJi4IM91 are adjusted.
The potential difference between B and the collection roller 93 can be kept constant.

Therefore, the electrostatic adsorption force between the brush fibers 91b and the toner on the photoreceptor 3a is always almost constant, and the toner is collected together with the toner attached to the brush fibers 91b. Since the electrostatic adhesion force with the p-ra 93 is always constant, the toner is collected directly from the collection roller 93.
This will ensure that the toner is collected. Therefore, Ni5 can always provide a stable cleaning effect without being influenced by the environment. Further, toner staining on the brush fibers 91b can be prevented.

Furthermore, considering the toner collection effect, the potential difference between the brush fibers 91b and the collection roller 93 is 30'.
Ov~500cm is preferable, and if it is within this range, the toner adhering to the brush fibers 91b will be sufficiently removed from the collection roller 93.
't can be done. Furthermore, if the bias voltage of the collecting roller 93 is set below 700 volts, the toner collecting effect will be degraded, so a bias voltage of 800 volts to 1000 volts is suitable. Here, even if the bias voltage of the collection roller 93 is increased by mmE, only an excessive current will flow, and the bias voltage will not increase, and the toner collection effect will not be improved. On the other hand, the potential of the brush wire 11111b is determined by the voltage of the varistor 92 having a desired voltage, and the potential of the brush wire @9
It is best to set voltage so that a voltage of 500 V or more is applied to l b, so -t wi ha 500 V ~ a o o v
It is better to choose the range h't'.

In the above embodiment M, a varistor is used as the non-1i3ta resistance element, but the present invention is not limited to this, and a Zener diode or the like may also be used.

It goes without saying that the cleaning device according to the present invention can be used not only for photoreceptors but also for bust-forming supports such as dielectric materials.

As explained above, one aspect of the present invention is to use a fur brush to clean powder developer remaining on an image/forming support such as a photoreceptor or dielectric, and remove powder yt* agent attached to the fur brush. Collected with an electrically biased roller 11
In this cleaning device, the fur brush is configured as a four-wall brush, and the conductive brush is connected to the ground via a nonlinear resistance element. It is possible to always achieve a stable cleaning effect of 11 without being damaged, and furthermore, it is possible to reduce toner stains on the fur brush.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an electrostatic recording device, and FIG. 2 is a schematic diagram of a fur brush type cleaning device according to the present invention. DESCRIPTION OF SYMBOLS 1... Hara Matsudai, 2... Illumination lamp; 3...-Rotating drum, 4... Charging electrode, 5... Developing device, 6... Transfer electrode, 1... Separation* , &, 8... m electrode, 9.
・・Cleaning device, IO・Assembly wrinkles, 11.1
2... Conveyance device, 13... Fixing device, 14... Paper discharge tray, 1°°° fur brush, 91 a... Brush core, 91b... Brush emm. 92...Barista, 93...IgIQ roller, 94
...Blade for removing toner. Patent applicant Hiroo Ayuki, Patent Attorney, Konishiroku Photo Industry Co., Ltd.

Claims (1)

[Claims] In a cleaning device that uses a fur brush to clean toner remaining on an image forming support using an electrostatic image recording method, and collects toner adhering to the ar brush with an electrically biased roller, A cleaning device characterized in that the conductive brush is formed as a conductive brush and the conductive brush is grounded via a nonlinear resistance element.