JPS60170878A - Conductive brush roll of electrostatic brush cleaning device - Google Patents

Abstract

PURPOSE:To improve the ability in cleaning while preventing corona discharging by covering the tip part of each conductive fiber of a brush roll made of conductive fibers with an insulating coat material. CONSTITUTION:The conductive brush roll 2 has a conductive fiber flocked cloth belt 12 wound around a cylindrical supporter 10 as a core material as shown in an oblique view figure. This cloth belt 12 is constituted by flocking conductive fibers 11 of 5-10 denier in base cloth 13 to a 300,000-500,000 fibers/cm<3> density. This conductive brush roll 2 has the outer peripheral part dipped in a polymer solution 16 obtained by dispersing resin such as ''Teflon'' and urethane in a volatile solvent and the brush is rotated to form a polymer layer on the surface for insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to a conductive brush roll of an electrostatic brush cleaning device that removes residual toner on a photoreceptor by rubbing the conductive brush roll against a photoreceptor. It is something.

As a prior art electrostatic brush cleaning device, a device as shown in FIG. 1 is known. In other words, the conductive brush roll 2 is placed inside the housing 1 with a surface area of 1/r.
Mukesen 1st person 2 trr m i hole in to he
yV, the detoning roll 4 is brought into contact with the conductive brush roll 2, and the detoning roll 4 is brought into contact with the conductive brush roll 2.
A cleaning corotron 6 and a lamp are placed in front of the housing 1, and a low detoning pressure is applied to the detoning brush roll 2, a pressure of the same polarity is applied to the detoning roll 4, and a cleaning corotron 6 and a lamp are placed in front of the housing 1. 7 is provided, and the remaining toner image transferred from the photoreceptor 3 to the paper (hereinafter referred to as residual toner) is
First, the cleaning corotron 6 to which a DC voltage is applied is charged to have a single polarity. In the drawing, it is charged to ().

Next, the conductive brush roll 2 to which a DC voltage of the opposite polarity to that of the cleaning corotron 6 is applied is rubbed against the photoreceptor 3 to clean the residual toner on the photoreceptor 3 using Coulomb force.

The cleaned residual toner is once captured by the conductive plush roll 2, then transferred to the detoning roll 4, removed by the scraper 5, falls onto the hopper 8, and is conveyed to the developing machine by the auger 9. Type brush cleaning devices are known.

The conductive brush roll 2 has a core material (0) with a large number of conductive fibers 11 planted in the shape of a brush, and the conductive fibers 11 are made of polymer, as shown in FIG. 2 (α). A core material 11A made of a mixture of carbon and polymer is provided inside the main body 11α, and a 'ti'Q is made of a material with carbon dispersed in a polymer, as shown in Fig. 21<h>.
As shown in Figure 2 (C), the core material made of polymer was heated to 7°C. It is known that an outer circumferential portion +1d made of a mixture of polymer and carbon is provided on the outer circumferential surface of the carbon fiber.

In any case, the conventional conductive fiber 11 has a conductive portion exposed on the tip surface and the circumferential surface.

This causes the following problems.

■ Toner with a specific electrical resistance of 1010 Ωam or less cannot be cleaned.

The reason for this is that since a DC voltage of opposite polarity to the toner is applied to the conductive fibers, the specific electrical resistance of the toner that has been cleaned and adhered to the conductive fibers 11 is 10
If it is less than 10 Ωcm, charges will be injected from the conductive fibers 11 as shown in FIG.
remains attached to the conductive fibers 11 without being captured by the
Toner having a specific electrical resistance of 1010 Ωcm or less cannot be cleaned because the conductive fibers 11 become extremely dirty and adhere to the photoreceptor 3 again, or the cloud-like water scatters or leaks outside the housing 1.

This is especially noticeable in a multi-source environment.

■ The conductive part is made up of several carbon particles dispersed within the polymer, and the hard carbon particles rub directly against the surface of the photoreceptor, accelerating abrasion of the photoreceptor and shortening its lifespan. I end up.

OBJECTS OF THE INVENTION It is an object of the present invention to enable good cleaning even with a toner having a specific electrical resistance of 1010 am or less, and to improve the life of the photoreceptor by reducing wear on the photoreceptor.

Constituent of the Invention The tip of the conductive R-type material forming the groove bottom of the brush roll is cut out with an insulating coating material.

Embodiment FIG. 4 is a perspective view of a low-density brush roll 2, in which a conductive fiber flocked cloth belt 12 shown in FIG. 5 is wound around a cylindrical support 10 serving as a core material. The conductive fiber flocked cloth belt 12 is attached to the base fabric 13 as shown in Fig. 482 (cx) + (
A) # (c) VC showing T Yo57r 4% R fiber (5
~10 denier) I l't 31,500,000 fibers are flocked at a density of Δn1, and the flocked (weave) is I' weave or V weave as shown in Figures 6 and 7. ing.

In FIGS. 6 and 7, 14 is a conductive adhesive, and as shown in FIG. In addition to supplying each conductive fiber + castle fiber 11
It is designed so that it will not come out from the base fabric 13.

As shown in Figure 9, Teflon resin, urethane resin, etc. are dispersed in volatile bath additives. The outer periphery of the polymer'/[I6& 17 to provide an electrically conductive brush roll according to the present invention.

Note that it may be coated with another insulating coating material instead of the polymer layer.

If such a sleeping brush roll 2 is used, the insulating coating of the insulating coated paulownia can prevent charges from being injected into the toner, so even toner with a specific electrical resistance of 1010 Ωcm or less can be properly IJ-coated. At the same time, it can be cleaned well even in a multi-source environment.

Therefore, it is possible to perform a good cleaning operation regardless of the type of toner, and also to perform a cleaning action with less environmental dependence.

In addition, since the hard carbon particles do not directly rub against the surface of the photoreceptor 3, the 1A resistance of the photoreceptor 3 can be reduced and the life span can be improved.

Moreover, the voltage for generating corona discharge in the cleaning region and the detoning region can be made higher than that at the tip of the conductive fiber by the insulating coating, so that the cleaning ability can be improved.

In other words, the cleaning area depending on the voltage applied to the conductive brush roll and the circumferential speed is as shown in FIG.
As is clear from this surface and Ig theory, the higher the applied voltage, the stronger the Coulomb force that attracts the toner, but when a certain voltage is exceeded, corona discharge is generated in the cleaning area and detoning area, and the toner is Since the polarity is reversed, problems such as not being cleaned or not being detoned occur.

On the other hand, if the insulating coating is removed, the conductive part of the photoreceptor or detoning roll and the conductive part of the conductive fiber will be separated.
The distance increases with the thickness of the insulating coating, and the commonly applied voltage is increased so that no discharge occurs, so that the toner can be attracted more strongly and the cleaning performance is improved.

Effect of invention IZ! It can perform good cleaning even with toner having a JT resistance of 1010 Ωcm or less, can perform good cleaning even under high temperature conditions, can perform good cleaning without depending on the MfflTh of the toner, and has low environmental dependence. can be done.

Since the carbon particles in the conductive fibers do not come into direct contact with the photoreceptor, wear and tear on the photoreceptor can be reduced and its lifespan can be extended.

Since corona discharge does not occur even if the voltage applied to the six-electrode plan roll is increased, the clearing ability can be improved.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the electrostatic brush cleaning device, Figure 2
Figures (α), (A), and (C) are perspective views of the 4-conductor fiber, Figure 3 is a diagram for explaining defects, Figures 4 and subsequent figures show the common practice of the present invention, and Figure 4 is a diagram of the conductive brush roll. FIG. 5 is a perspective view of a conductive fiber flocked cloth belt, FIGS. 6 and 7 are cross-sectional views showing the direction of conductive fibers, FIG. 8 is a cross-sectional view of a conductive brush roll, and FIG. The figure is an explanatory diagram of the application state of the polymer liquid, Figures 10 and 11 are front views and cross-sectional views of conductive fibers,
FIG. 12 is a schematic diagram showing a cleaning area expressed by applied voltage and circumferential speed. 11 is a conductive fiber. Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Tadashi Yonehara Patent Attorney Tadashi Hongmoto Figure 1 Figure 6/rJ ■ Figure 7 1 word Figure 8 2 Figure 9 Figure 10 Figure 11 Figure 7 12 figure

Claims (1)

[Claims] A conductive brush roll for an electrostatic brush cleaning device, characterized in that the tip portion of each isoelectric fiber 11 of the brush roll constituted by conductive fibers 11 is coated with an insulating coating material.