JPS58111078A - Cleaning device - Google Patents

Abstract

PURPOSE:To secure toner recovery from the fur brush in a cleaning device equipped with a recovery roll while improving cleaning effect, by making the fur brush of a semiconductor material. CONSTITUTION:Since the brush fiber 91b of the fur brush 91 is made of a semiconductor material, the brush fiber is held at a specific potential by a voltage drop when a current flows through the recovery roll 92 applied with a voltage. Further, potential differences between the brush fiber 91b, and a photoreceptor 3a and the recovery roll 92 are held constant respectively, and consequently mutual toner attracting force is specified to recover toner to the recovery roll 92. Furthermore, the brush fiber 91b is semiconductive, so charge is not accumulated by friction and the potential does not rise high, so the bias voltage to the recovery roll 92 is low.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for an electrostatic image recording device, which ensures toner collection from a fur brush so as to obtain a sufficient cleaning effect.

In electrostatic image recording devices, such as electrophotographic copying machines and electrostatic non-impact printers, a photoreceptor or thermoelectric material is recorded using reflected light or electrical information signals obtained by scanning 11/L light. Is the original or drowsiness information static?
kfk is formed, the static 11IE latent image is developed into a visible image, and this visible image is transferred to recording paper and then fixed to form a recorded image. Figure 1 shows conventional electronic photography I! This shows the schematic configuration of the machine, with swimming platform 1 moving in the direction of the arrow (solid line).
The original G placed on top is irradiated with the illumination lamp 2, and the reflected light from the original G is projected onto the photoconductor 3a of the 61g single rotation drum 3 in the direction of the arrow, and the original is placed on the photoreceptor 31. G's image of Reiden Hiroshi [forms]. - A % electrode 4 for uniformly charging the photoconductor 3m, a developing device aS, and a transfer electrode 6 are provided on the side of the rotating drum 3;
Mintuden &7, IIM pole 8, and cleaning device F*9
(fur brush method) are arranged in sequence.
f#W, the high-resolution image is developed by the developer 1 and 5 to form a visual image, and the visual image is a sheet fed from a paper feeding device 110 such as a cassette by a conveyance device 11. h6
Transcribed by. Post-transcription record @P is a minute JIilEt!
ll! ? It is separated from the photoreceptor 31 by +C and transferred to the conveying device [1
2, the paper is transported to the fixing device 13, where it is fixed and ejected to the paper ejection tray 14. In #bl above, in order to be able to repeatedly use the three sets of photoreceptors, the series of electrophotographic groups are Of the seven steps, it is necessary to remove the iE4 shield and toner remaining on the surface of the transfer process and photoreceptor 31, and the residual charge is removed by the removal electrode 8, and the residual toner is removed by the cleaning device 9.

There are many well-known cleaning devices used in electrophotography IIIt repair machines, such as fur brush type, blade type, and magnetic brush type. The fur brush type uses a brush made of rabbit or other animal hair or synthetic fibers.It is rotated continuously to remove toner remaining on the surface of the photoreceptor, and the toner adhering to the fur brush comes into contact with the fur brush. In this method, the toner is removed with a toner removal plate (called a 7-recoverer) installed in such a way that the toner is removed, and the removed toner is vacuum-sucked or sucked with a fan, and 1 gram is collected with a filter. The blade type is a method in which a blade made of elastic synthetic resin is pressed against the surface of the photoreceptor to remove residual toner. On the other hand, the magnetic brush type has a group of magnets with different polarities inside (a non-magnetic cylindrical sleeve arranged alternately close to the surface of the photoreceptor), and either the carrier is attracted to the non-magnetic cylindrical sleeve and rotated, or the group of magnets is The toner remaining on the surface of the photoreceptor is removed intermittently by simultaneous rotation, and the toner on the surface of the sleeve is scraped off with a blade or the like. As the speed increases, the blade method may not be able to perform sufficient leaning, so the fur brush method has been used in high-speed photographic cameras. In addition, fur flage in particular does not press against the surface of the photoreceptor, especially the selenium drum, as a blade does, which causes scratches.Also, fine solid matter does not adhere to the blade and cause scratches, allowing for a longer lifespan of the photoreceptor. There is a tendency for the seven-brush type cleaning device to be used favorably because of the following features.

In the conventional fur brush type cleaning device, 7
- Rotate the brush at high speed to scrape the surface of the photoconductor to remove toner remaining on the surface of the photoconductor.
The toner adhering to the brush fibers is brushed off by a 7-recover bar provided so as to be in contact with the brush fibers, and the brushed off toner is sucked by a fan and collected by a filter. However, since a fan is used to suck the toner and a large space is required, instead of that, an electrically biased 11# IM member (hereinafter abbreviated as "collection roller") is brought into contact with the brush fibers of the fur brush. The toner adhering to the brush fibers is electrostatically transferred onto a collection roller, and then scraped off by a toner scraping blade provided in contact with the collection roller (for example, a special electric
349-20227).

In a fur brush type cleaning device using such a collection roller, the main line pII of the brush fibers of the fur brush
The toner that electrostatically adheres to the brush fibers using the IIIE property is adsorbed to the brush fibers, and as the brush fibers rub against the photoconductor and the charged potential is applied, the toner is transferred to the collecting roller with the opposite polarity to the toner. high voltage (for example, 3 kV to s kv
) is applied, brush 1! & The dirt adhering to the pongee becomes difficult to move to the collection reeler, and as a result, toner leaks onto the brush fibers, and since the toner adheres to the brush fibers, the toner sticks to the brush line III and stains it. For this reason, the electrostatic force between the brush & string and the toner may become strong or stiff, resulting in poor cleaning, and the toner that once adhered to the brush braid may adhere to the photoreceptor surface 1 again, causing a positive charge. Sometimes it is impossible to obtain a leaning effect. In addition, in order to make it easier for the toner to move to the 1gl collection roller, the brush fibers to which the toner is attached are brought into contact with the roller.
] Is there a method of removing the static electricity with K Brush #l Koji by rubbing it?In this case, the corona 111& is likely to become dirty due to toner scattering, making it impossible to maintain a stable discharge, and However, if conductive brush fibers are used instead of insulating brush fibers, the toner adhering to the surface of the photoconductor will not be able to hold the electric potential. The line does not move by 11kK, and the initial cleaning effect cannot be obtained. Similarly, even if a bias voltage is applied to the collection roller, no bias voltage is applied to the collection roller.

The present invention has been made in view of the above-mentioned points, and the present invention uses a fur brush to clean powder developer remaining on an image forming support such as a photoconductor or iKt body, and removes powder adhering to the fur brush. In a cleaning device that collects decolorizing agent using an electrically biased roller, the fur brush is made of a conductive material. By doing so, a sufficient cleaning effect can be obtained. At the same time, the same amount of toner from the fur brush is ensured.

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

#! 2 is a schematic diagram showing the configuration of a seven-brush type cleaning device according to the present invention, and 3 is a photoreceptor 3at.
8 is an electrode, and 9 is a cleaning device. The cleaning device 9 includes a brush core 911 and a brush core 911 surrounding the brush core 911, which is made of carbon fiber or the like.
The fur brush 91 rotates from the motor M11/C and the fur brush 91 is connected to
, K, and a toner scraping blade 93 provided in contact with the collection roller 92. Note that the overall resistance of the brush fibers 91b is preferably a value KtE) in the range of 10'Ω to 1010Ω, and at this time, for example,
When a bias voltage of kV is applied from the electric current ikI, a current of 0.14 A to 10 μA flows through the photoreceptor 3 through the collection roller 92 and the brush fibers 91b. Further, it is more preferable that the overall resistance of the brush fibers 91b is set to a value in the range of 10''Ω to 10′Ω, and the current at that time is set to be 1 μA to 10 μA.

Now, in order to remove the toner from the above-mentioned cleaning device [C], the fur brush 91 is rotated at high speed in the direction of the arrow to rub the rotating drum 3 rotating in the direction of the arrow. The attached toner is electrostatically attached to the brush fibers 91bK, and the attached toner is electrostatically transferred to the collection roller 92 rotating in the direction of the arrow in contact with the brush fibers 91b, and the toner scraping blade 9
Scrape off by 8.

In this example, semiconducting brush fibers 91b are used, so the delicate brush 91b has a certain resistance, and the brush fibers 5tbK11
When 1i1k flows in, a voltage drop occurs due to the resistance of the brush fibers 91b.

As a result, the brush fibers 91b are kept at a constant potential due to the voltage drop, and the potential difference between the brush IIk koji 91b and the light body 3a and the brush li[91b and the collecting roller 9
2, the electrostatic adsorption force between the EzoW brush 91b and the toner on the photoreceptor 3j is always almost constant, and the toner is hardly drawn. Brush fiber *lbK#6゜Also, brush fiber 9
Since the electrostatic adsorption force between the donor attached with lbK and the 1-collection p-ra 92 becomes constant, the toner reliably moves to the collecting roller 92, and the toner becomes 1-collection or 1-collection, and the toner becomes normal. A leaning effect can be obtained. Therefore Corona 1
The 11m additional device is no longer required, and since the brush fiber 91b is made electrically conductive, the brush assembly fi91b
Since the brush fibers 91b are not torn by friction, the electric potential of the brush fibers 91b is stiff but does not become high, and even if the bias voltage of the collection roller 92 is about 1kV, the toner cannot be sufficiently transferred to the collection roller 92. Since the collecting roller 92 can be moved, the bias voltage of the collecting roller 92 can be low.

It goes without saying that the device according to the present invention can be used not only for photoreceptors but also for image forming supports such as dielectrics.

As explained above, the present invention uses a fur brush to clean powder developer remaining on an image forming support such as a photoreceptor or dielectric, and electrically removes the powder developer attached to the fur brush. In a cleaning device that uses a roller that is biased to collect particles, the brush is made of a semi-conductive material. With this arrangement, a sufficient cleaning effect can be obtained and toner collection from the fur brush can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an electrostatic recording device, and FIG. 2 is a schematic ljM diagram of an embodiment of a fur brush type cleaning device according to the present invention. l...Original table, 2...Illumination lamp, 3...Rotating drum, 4...Charging electrode, b...** Loading device 6...Transfer electrode, 7...Distribution ml -, 8... 餘 turtle turtle -, 9.
...Cleaning device, 10...Supply && Elephant, 11.1
2... Conveying device, 13... Fixing device, 14... Paper discharge tray, 9l... Fur brush, 91m... Brush core, 9lb... Brush fiber, 92... Collection roller, 9
3... Toner scraping blade. % 1 person Konishiroku Photo Industry Co., Ltd. Attorney Hiroo Suzuki

Claims (1)

[Claims] The toner remaining on the image forming support by the electrostatic image recording method is cleaned with a fur brush, and the toner that has been added to 7 KH% is cleaned with an electrically biased roller! &&-, said 7ani 1
This cleaning device is patented in that the handle is made of conductive material.