JPS60128481A - Electrostatic brush cleaning device - Google Patents

Abstract

PURPOSE:To use only one brush roll and to reduce the titled device at its size by applying positive and negative voltages to the surface of a brush roll for washing residual toner of an electronic copying machine and forming an insulating area in conductive areas and between the conductive areas. CONSTITUTION:The residual toner is sucked by the brush roll 3 to be rotated by contacting with a photosensitive body 1. Conductive adhesives layers 4a, 4b to which positive voltage +V1 and negative voltage -V2 are applied are formed on a cylindrical part 9 of the center of the brush roll 3 and the gap between both layers is insulated. Conductive fiber is planted on the conductive adhesives layers 4a, 4b of the cylindrical part 9 to form positive and negative conductive fiber planting areas Ap, An and insulating fiber is planted on the insulating part of the cylindrical part 9 to form an insulating area Ai. Positive DC voltages +V3 and negative DC voltage -V4 are applied to a recovery roll 5a and the other recovery roll 5b, respectively. Consequently, residual toner 2a, 2b having positive and reverse polarity respectively are recoverted efficiently only by one brush, so that the size of the device can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cleaning device for a copying machine, and more particularly to a cleaning device for a copying machine that uses electrostatic attraction to clean a photoreceptor using a conductive fiber implant brush. The present invention relates to an electric brush cleaning device.

Prior Art As shown in FIG. 1, a conventional electrostatic push cleaning device cleans both the toner 2a of positive polarity and the toner 2b of opposite polarity remaining on the photoreceptor l and entering the cleaning section. 2 brushes 4 - 3 a
3b, one brush roll 3a was used to clean the positive polarity toner 2a, and the other brush roll 3b was used to clean the opposite polarity toner 2b from the photoreceptor l.

That is, since conductive fibers are implanted in the brush roll 3a and a positive potential +VIK is maintained through the conductive adhesive layer 4a, the negatively charged toner (positive polarity toner) 2a
can be cleaned by electrostatic attraction. This toner 2a is transferred to a collection roll 5a to which a higher positive pressure force Vs is applied, scraped off by a blade 7a, and collected -8
It is collected in a. Similarly, the positively charged toner (reverse polarity toner) 2b is cleaned by a brush roll 3b which is similarly implanted with conductive fibers and maintained at a negative potential Va via a conductive adhesive 4b. , even lower negative voltage -■4
is applied to the collection chamber 5b, where it is scraped off by the blade 7b and collected into the collection chamber 8b.

In this way, conventional electrostatic brush cleaning devices can collect toner of both positive and reverse polarity by using two brush rolls, but since the brush rolls occupy a fairly large volume inside the copying machine, It was difficult to downsize the machine.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide one brush roll with the same function as two brush rolls, thereby reducing the size of a copying machine.

Structure of the Invention The electrostatic brush cleaning device according to the present invention is provided with a conductive fiber planting area to which a positive heavy voltage is applied and a conductive fiber planting area to which a negative voltage is applied, on the roll surface, and It is characterized by using one brush roll in which insulating fiber planting areas are arranged between fiber planting areas,
One brush roll has the same function as the conventional two brush rolls.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 2 shows an example of the configuration of the brush roll 3 used in the present invention, and the surface of the cylindrical roll 90 is coated with a conductive adhesive layer 4a impregnated and applied to a base fabric.

two areas ip where the conductive fibers face each other via 4b;
The electrically insulating fibers are also planted in the roll axis direction in two areas Ai and Ai between the respective conductive fiber planting areas Ap and An.

Various types of conductive fibers are known, and any of them can be used in the present invention; for example, acrylic conductive fibers, trade name 5A-7 (manufactured by Kishiki Co., Ltd.) are used.

The thickness and density of the conductive fibers can be set as appropriate, but preferably the thickness is 10 denier and the fiber density is 20,000 fibers/! n2 is appropriate. Various types of insulating fibers can be used,
In addition, it is preferable to use a conductive fiber having a thickness and fiber density similar to or similar to the conductive fibers described above, since the contact force to the photoreceptor will be uniform. Conductive fiber planting area Ap
A positive DC voltage +■1 is applied through the conductive adhesive layer 4a, and a negative DC voltage -■2 is applied to the other conductive fiber planting area An through the conductive adhesive layer 4b. will be applied.

On the other hand, the role of the insulating fibers is to prevent current from leaking when the conductive fibers to which a positive voltage is applied and the conductive fibers to which a negative voltage is applied come into contact.

FIG. 3 shows a schematic configuration of an electrostatic brush cleaning device using a brush roll configured as described above.

In FIG. 3, the brush roll 3 is disposed in contact with the photoreceptor 1 with a constant nip, and a positive DC voltage +1 is applied to the conductive fiber planting area Ap of the brush roll 3, and A negative DC voltage -v2 is applied to the conductive fiber planting area An.
The voltages are applied through conductive adhesive layers 4a and 4b, respectively.

Normally +Vl H is about 500 V, -Vm is about -5OO
There is a vte.

The brush roll 3 is further provided with two collection rows y5a and 5b in contact with each other with a constant nip. A positive DC voltage +3 is applied to one collection roll 5a, and a negative DC voltage -7 is applied to the other collection roll 5b, as in the conventional case. Usually +Va is about 1000V, -V
4 is about -1000V. In addition, each collection roll 5a
, 5b are covered with insulating films (aluminum) 6a, 6b, which connect the conductive fibers of the brush roll 3 and the collection roll 5a,
5b so that no current leaks between the terminal and the terminal 5b. Blade 7a in contact with each collection roll sa, sb,
7b is arranged as in the conventional case, and each blade 7a is provided.

7b is arranged in each recovery chamber 8a, Bb.

Next, the cleaning operation by this device will be explained.

Toner that has not been completely transferred to the transfer paper and remains on the photoreceptor 1 and enters the cleaner includes toner 2a of positive polarity (negatively charged in the example) and toner 2b of opposite polarity (positively charged in the example). These are disturbed by the brush roll 3. Then, the positive polarity toner 2a disturbed by the brush roll 3 is electrostatically attracted to the conductive fiber planting area Ap of the brush roll 3 to which a positive voltage is applied. and,
Since a higher voltage is applied to the collection roll 5a, the positive polarity toner 2a moves from the brush roll 3 to the collection roll 5a, adheres thereto, is scraped off by the blade 7a and collected in the collection chamber 8a, and is reused. served.

On the other hand, the reverse polarity toner 2b disturbed by the brush roll 3
is electrostatically attracted to the conductive fiber planting area An of the brush roll 3 to which a negative voltage is applied, adheres to the collection roll 5b, is scraped off by the plate 7b, and is collected in the collection chamber 8b. However, this toner 2b is a reverse polarity toner and is not suitable for reuse, so it is discarded. In the manner described above, toner remaining on the photoreceptor 1 without being completely transferred to the transfer paper is cleaned.

An example of the operating conditions for each component is as follows: The circumferential speed of the photoreceptor I is 300 ws/s, the circumferential speed of the brush roll 3 is 600 ns/s, and the circumferential speed of the recovery rolls 5a and 5b is 60011II/s. be. Further, the outer diameter of the brush roll 3 is 60 m, the nip between the photoreceptor l and the brush roll 3 is 2 m, the outer diameter of the collection rolls 5a and 5b is 15 m, and the brush rule and the collection roll 5a.

The amount of interference of 5b is 2m.

FIG. 4 shows another example of the configuration of the brush roll 3 used in the present invention. In the brush roll 3 of this example, two tape-like materials (A p t A n
) and two tape-like materials with insulating fibers planted on the base fabric (
Ai, At) are spirally wound such that an insulating tape-like material is interposed between each conductive tape-like material, and a positive voltage +v1 is applied to the conductive fiber planting area Ap. A negative voltage -2 is applied to the other conductive fiber planting area An through the conductive adhesive layer. The number of conductive fiber planting areas is not necessarily limited to two, but may be four, for example.

Effects of the Invention As described above, the electrostatic brush cleaning device according to the present invention includes a conductive fiber planting area to which a positive voltage is applied and a conductive fiber planting area to which a negative voltage is applied to the surface of the roll. In addition, since a brush roll with an insulating fiber planting area arranged between each conductive fiber planting area is used, this single brush roll can perform the same function as the conventional two brush rolls. have Therefore, compared to the conventional electrostatic brush cleaning device, the number of brush rolls can be reduced by one, making it possible to reduce costs and making the copying machine more compact.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional electrostatic brush cleaning device.
FIG. 2(A) is a sectional view of the brush roll used in the present invention, FIG. 2(B) is a front view thereof, and FIG. 3 is a cross-sectional view showing an embodiment of the electrostatic brush cleaning device according to the present invention. , 4th
The figure is a front view showing another embodiment of the brush roll used in the present invention. 1... Photoreceptor, 3... Brush roll, 4a, 4b.
...Conductive adhesive layer, 5a, 5b...Recovery roll, 7
a, 7b...Blade, Ap...A conductive fiber planting area to which a positive voltage was applied, An...A conductive fiber planting area to which a negative voltage was applied, Ai...Insulating fiber planting area Setting area. Applicant: Fuji Xerox Co., Ltd. Dairuto Patent attorney: Masaaki Yonehara Patent attorney: Tadashi Hamamoto

Claims (1)

[Claims] In an electrostatic brush cleaning device that uses electrostatic attraction to clean a photoreceptor in an electrophotographic copying machine, a conductive fiber implanted area where a positive voltage is applied to the surface of a roll. A conductive fiber planting area is provided to which a negative voltage is applied.
An electrostatic brush cleaning device that uses a single brush roll in which an insulating fiber planting area is arranged between each conductive fiber planting area.