JPH01161281A - Device for cleaning photosensitive body surface - Google Patents

Abstract

PURPOSE:To efficiently remove talc stuck to the surface of a photosensitive body by constituting a grinding pad with wool, synthetic resin, stainless fabric or their mixture. CONSTITUTION:The grinding pad 23 is made of wool, synthetic resin, stainless fabric, or their mixture. The grinding pad 23 is pressurized against the surface of the photosensitive drum 10 by a spring 24, and grinds with small quantity said surface at every copying. The required pressurizing force of the grinding pad 23 will be suffice to remove talc stuck to the surface of the photosensitive drum 10, and is 4-40g/cm, preferably 15-20g/cm. Thus talc stuck to the surface of the photosensitive body can be removed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for cleaning the surface of a photoreceptor in a copying machine.

[Background of the invention]

Generally, when toner is transferred from the photoconductor onto the transfer paper in the transfer section, paper dust (particularly fillers such as talc and kaolin added to give stiffness to the paper) is deposited on the surface of the photoconductor from the transfer paper. Migration adhered. It has been confirmed that the amount of transferred paper dust increases as the transfer output increases. The filler thus transferred to the surface of the photoreceptor is rubbed by a blade for removing residual toner and firmly adheres to the surface of the photoreceptor, causing deterioration of the characteristics of the photoreceptor.

In other words, when the photoreceptor is made of an organic optical semiconductor (OPC), when talc adheres to the surface, the charged potential increases due to friction with the developer, increasing the image density and causing fogging. When copies were made in a high humidity environment using a photoreceptor with talc adhered to its surface, image deletion occurred.

The above problem is due to the fact that talc inhibits the formation of latent images, which does not occur when kaolin is attached even with the same filler. Therefore, recently it has been proposed to use kaolin instead of talc as a filler for transfer paper, but there is a problem that copying machine manufacturers cannot immediately respond because the only way to replace the filler for transfer paper is to depend on the paper manufacturer. there were.

Therefore, the applicant brought a polishing pad into sliding contact with the surface of the photoreceptor.
We proposed a technique that could wipe away the attached talc by polishing the surface a small amount, but further research on the material of the polishing pad was required to make talc removal more efficient.

[Purpose of the invention]

In view of the above points, it is an object of the present invention to provide a cleaning device for the surface of a photoreceptor using a polishing pad that can efficiently remove talc.

C) Structure of the Invention In order to achieve the above object, the present invention provides a cleaning device for the surface of a photoreceptor in which a polishing pad is brought into sliding contact with the surface of a photoreceptor and the surface can be slightly polished. , made of stainless steel fiber alone or a blend of materials.

〔Example〕

Next, an explanation will be given based on the drawings of an apparatus for implementing the present invention.

In FIG. 1, 10 is a photosensitive drum, and 11 is a cleaning box provided to face the photosensitive drum 10. In FIG. In the upper part of the cleaning box 11, there is a blade 12 that comes into sliding contact with the photoreceptor drum 10 and scrapes off toner remaining on the drum surface after transfer, and a blade 12 that touches the surface of the photoreceptor drum 10 on the downstream side of the blade 12. A polishing means 22 is provided for applying pressure and slightly polishing the surface. Further, a guide plate 15 is provided at the lower part to guide the L/car 13 scraped off the drum surface by the blade 12 to the toker receiver 14. The installation position and angle of the guide plate 15 and the distance from the drum surface are important in order to prevent the toner 13 that has entered the cleaning box 11 from leaking back. The toner that has passed along this guide plate 15 and entered the toner receiver section 14 is transferred to the screw 1.
6 to a disposal case (not shown).

The blade 12 is supported on the front edge side of a support member 18 which is hinged to a pin 17 provided on the inner surface of the side wall of the cleaning box 11, and is sandwiched between support claws 18a and 18b. The supporting member 18 is biased counterclockwise by a spring 19 interposed between the upper surface on the rear edge side and the inner surface of the lid 11a of the cleaning box 11, thereby pressing the blade 12 against the surface of the drum 10. are doing.

Further, the support claw 18a is provided on the back side of the blade 12.
A plate-like member 20 fixed with adhesive or the like is arranged in parallel. The plate member 20 has a function of preventing the toner 13 scraped off by the blade 12 from rising and flying up along the back surface of the blade. In other words, the toner 13 that has entered between the blade and the plate-like member is compressed there and falls as a large lump.

Furthermore, a sheet-like member 21 is provided on the rear edge side of the blade' support member 18 to close the space between the blade support member 18 and the rear wall of the cleaning box 11. This is designed to divide the inside of the cleaning box 11 into a lower chamber A having a toner receiving portion 14 and an upper chamber B, so that the toner particles are stopped in the lower chamber A and do not reach the upper chamber B. be. This sheet-like member 21
Since the blade support member 18 swings around the hinge joint 17, it is preferable to make the blade support member 18 thin and made of a stiff elastic material (for example, PF, T base) so as not to impede the swing.

The polishing means 22 is attached to the blade support member 1 as shown in the second figure.
a fixed frame body 22a having both end pieces 22a' that can be coupled to a common pin 17 hinge-coupled with a fixed frame body 22a;
A movable frame body 22b is attached so as to be slidable in the width direction of the movable frame body 22b by a long hole 26 and a pin 26', and is biased in one direction by a spring 24, A polishing pad 23 is replaceably mounted in a groove of a groove frame 25. Thus, the polishing means 22 removes the cover 11a of the cleaning box 11 and attaches the fixed frame 22a to the pin 17 on the inner surface of the side wall of the box 11.
Both end pieces 22a' are connected horizontally as shown by the two-dot chain line in the figure, and while compressing the movable frame 22b against the spring 24, the polishing pad 23 is brought into contact with the surface of the photoreceptor drum 10 as shown by the solid line in the figure. Make it. Thereafter, as shown in the first diagram, the lid part 11a is fitted into the cleaning box 11 and fixed, so that the polishing means 22 can remove the part 11 of the lid part 11a.
b, and is supported from above so as to be able to oppose the force (indicated by the arrow) in the rotational direction of the photosensitive drum 10.

The polishing pad 23 installed as described above is brought into pressure contact with the surface of the photoreceptor drum 10 by the springs 24, and the drum surface is slightly polished for each copy. The pressing force of the polishing pad 23 required for this slight polishing is sufficient to wipe away the talc attached to the surface of the photoreceptor drum, and is 4 to 40 g/
cm, preferably 15 to 20 g/cm.

Further, the polishing pad 23 forms a member such as a nonwoven fabric, such as a plate-shaped fer) F, which is made by compressing fibers. In this case, the thickness a of the plate-like felt F is larger than the depth d of the groove frame 25. Then, the plate-like felt (F) is cut into strips at intervals of a width slightly larger than the groove width W of the groove frame 25 to form felt strips B having a rectangular cross section. The strip B is fitted into the groove frame 25 so that the two surfaces B-IB-2, which are not cut surfaces, are polished surfaces. This polished surface becomes fatigued as a result of long-term use, so in such a case, the groove frame 25
When both polishing surfaces become fatigued, they are replaced with new ones.

The material of the polishing pad 23 is wool (wool fiber).
It is recommended to use That is, as shown in FIG. 5, wool has scales 27 on the surface of the main fiber 26, and
This is because the aggregation of the particles exhibits excellent polishing properties.

Of course, it is also possible to use fibers other than wool, such as synthetic fibers or stainless steel fibers. Synthetic fibers usually do not have scales like wool, so when used alone they lack abrasiveness, and stainless steel fibers have harsh metal edges, so they tend to be too abrasive when used alone. Therefore, in the case of synthetic fibers and stainless steel fibers, it is advisable to blend them or blend them with wool in an appropriate proportion to maintain the desired abrasiveness.

Note that the above-mentioned polishing property is also related to the pressing force of the polishing pad 23, but in reality, it is sufficiently satisfactory at about 1 μ to 1.5 μ/10,000 copies.

〔Effect of the invention〕

As explained above, the photoconductor surface cleaning device according to the present invention is capable of abrasive a slight amount of polishing by sliding a polishing pad on the photoconductor surface. Because it is characterized by being composed of fibers, stainless steel fibers alone or in a blended material,
This method has excellent effects in that talc attached to the surface of the photoreceptor can be efficiently removed without damaging the surface of the photoreceptor.

[Brief explanation of the drawing]

The figure shows an example of the apparatus used to carry out this invention.
The figure is a schematic cross-sectional view, FIG. 2 is a schematic perspective view of the polishing means, FIG. 3 is a perspective view showing the state in which the polishing means is pressed against the surface of the photoreceptor, and FIG. 4 is an explanation showing the manufacturing order of the polishing pad. FIG. 5 is an enlarged perspective view of the wool. 10-Photosensitive drum 11-Cleaning box 12-Blade 13-) Car 18-Blade support member 19-Spring 20-Plate member 21-Sheet member 22-Abrasive means 22a-Fixed frame 22 b-m- Movable frame 23 - Polishing band 24 - Spring 25 - Groove part F - Member like non-woven fabric (plate-shaped felt) B - Strips B-1, 'B-2 - Polishing surface

Claims (1)

[Claims] A cleaning device for the surface of a photoreceptor in which a polishing pad is brought into sliding contact with the surface of the photoreceptor so that the surface can be slightly polished, characterized in that the polishing pad is made of wool, synthetic fiber, or stainless fiber alone or in a blended material. A cleaning device for the surface of the photoreceptor.