JPS6216953A - Paper dust removing device in copying machine - Google Patents

Abstract

PURPOSE:To effectively remove paper dust generating during paper feed, by allowing a decharger brush and a paper dust retrieving member to make contact with a resist roller. CONSTITUTION:A decharger brush 11 is composed of a fur of stainless wires or carbon fibers, and makes into contact with a resist roller 10. Since this resist roller 10 is liable to be frictionally charged, and therefore, generated paper dust is stuck to and is therefore conveyed by the resist roller 10, but is scooped up by the decharger brush 11. When the amount of paper dust scooped up by the decharger brush exceeds a predetermined value, paper dust may pass through the decharger brush 11. Since a dust retrieving member 12 having a corrugated inside makes into contact with the resist roller downstream of the decharger brush 12, paper dust may be retrieved by the member 12. The volume of paper dust accumulated by the member 12 may be cleared up by removing the member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper dust removal device for a copying machine that can be used in electrophotographic copying machines, facsimile machines, light printing machines, and the like.

Conventional technology In recent years, electrophotographic copying machines and facsimile machines have become rapidly popular.
At the same time, high quality images are also desired.

Hereinafter, a conventional paper feeding device for a copying machine will be described with reference to the drawings. FIG. 3 is a side sectional view of a conventional paper feeding device used in an electrophotographic copying machine, in which 1 is a paper feeding cassette, and 2 is paper stored in the paper feeding cassette 1. In FIG. 3 is a paper pushing device, 4 is a paper feed cassette bottom plate, sa, sb
6 is a paper feeding roller, and 6 is a double feeding prevention member. 7a and 7b are paper feed guide plates, and Ba and sb are a pair of paper conveyance rollers.

The operation of the conventional paper feeding device configured as described above will be described below. A paper feed cassette 1 stores therein a large number of sheets of paper 2, which are stacked on a bottom plate 4 of the paper feed cassette. The paper push-up device 3 comes into contact with the paper feed cassette bottom plate 4 and plays the role of always bringing the topmost paper into contact with the paper feed roller 6a with stable pressure, regardless of the amount of paper. sa,
sb is a paper feed roller made of a material with high frictional force such as rubber and has a one-way clutch built therein, and 5a and 5b are connected by gears or the like. The paper 2 is sent out from the paper feed cassette 1 by rotating the paper feed rollers sa and sb. The electrical transmission prevention device 6 is made of a high-friction material such as rubber, and when multiple sheets of paper 2 are accidentally fed from the paper feed cassette 1, the frictional force between it and the paper feed roller 6b causes the gap between the sheets to be reduced. Only the paper on the paper feed roller 5b side is fed into the paper feed guide board by overcoming the frictional force. Reference numerals 7a and 7b are paper feed guide plates, and the paper is fed by the paper feed rollers through between the two guide plates to the paper conveyance roller.

The paper feed rollers 6a and 5b stop rotating when the leading edge of the paper 2 reaches the paper conveyance rollers sa and sb.

The paper conveying rollers 8a and 8b are a pair of rubber, metal, or a combination of rubber and metal, and correct the inclination of the leading edge of the paper being fed, and align it with the leading edge of the image on the photoreceptor (not shown). Rotation is started at the right timing so that the leading edge of the paper is aligned, and the paper is transported.

At this time, the paper feed rollers 5a and 5b rotate together with the paper by the action of the one-way clutch. A transfer unit (not shown) is attached to the paper sent to the photoconductor side by 8a and 8b.
The image on the photoreceptor is transferred.

Problems to be Solved by the Invention However, in the above-described configuration, the paper powder held by the paper 2 (the cut surface of the paper or the paper feed rollers 5a, sb)
X double feed prevention device 6, paper feed guide plates 7a, 7b, paper transport rollers sa, sb, paper fibers generated by paper-to-paper contact and friction) migrate onto the photoconductor during transfer, and the photoconductor This method has problems in that it causes poor cleaning of the image, stains on the image, and poor cleaning of the rollers of the fixing device.

In view of the above problems, the present invention provides a paper dust removal device for a copying machine that effectively removes paper dust generated during paper feeding.

Means for Solving the Problems In order to solve the above problems, the present invention provides a method in which a static elimination brush and a paper dust collection member are brought into contact with a registration roller that feeds paper in synchronization with image formation. be.

Effects According to the present invention, with the above-described configuration, the paper dust adhering to the registration roller is collected by the static elimination brush, and the paper dust that has passed through the static elimination brush is further collected by the paper dust collection member. A good copy can be obtained without sending the copy to the forming section.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a paper feeding unit according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main parts thereof.

In the figure, reference numeral 9 denotes a paper feed unit (not shown) attached to the paper feed section of the main body of the copying machine, which includes a registration roller 1° that feeds paper in synchronization with image formation in the copying process, a static elimination brush 11, and a removable paper powder. A recovery member 12 is provided. In the case of this embodiment, one of the registration rollers is installed inside the main body of the copying machine, and by attaching the paper feed unit 9, the registration rollers are configured as a pair of registration rollers. 1
3 is the paper to be fed.

The static elimination brush 11 is made of a stainless steel wire bundle or a carbon fiber bundle, and is in contact with the registration roller 10. Since the registration rollers 10 are easily charged by friction, the generated paper powder A adheres to the registration rollers 10 and is sent, and is scooped out by the static elimination brush 11.

When it is scooped up by this static eliminator brush and reaches a plate with a large amount of paper powder, it passes through the static eliminator brush. In this embodiment, a paper dust collection member 12 made of corrugated packing or foamed plastic is in contact with the downstream side, so that the paper dust collection member 12 can collect the paper dust. Paper dust collection member 12
If paper dust has accumulated on the member 12, it can be cleaned and replaced by removing the member 12.

Furthermore, the other end of the static eliminating brush can be sharpened on the paper being fed, making it more effective.

As described above, in this embodiment, paper dust is collected by bringing the static elimination brush and the paper dust collection member into contact with the registration rollers, so that it is possible to prevent paper dust from adversely affecting image formation.

Effects of the Invention As is clear from the above explanation, since the present invention is configured so that the paper dust removal member comes into contact with the registration roller,
It can prevent paper powder from being taken out of the paper feeder, and therefore, especially when applied to an electrophotographic copying machine, cleaning of the photoreceptor is poor.2 Image stains.

A substantial effect can be obtained in that cleaning failures of the rollers of the fixing device can be prevented.

Furthermore, since paper dust is removed from the registration rollers, there is no slippage between the paper and the registration rollers, and the position of the leading edge of the image on the photoreceptor and the leading edge of the paper is always stable.

Further, the present invention relates to a pair of registration rollers.

The effect is doubled by using the paper dust removal member in combination. For example, by using an elastic member with an edge for one registration roller and using a fibrous member for the other registration roller, the paper dust removal effect of the pair of registration rollers can be simultaneously exhibited.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a paper feeding unit according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part thereof, and FIG. 3 is a sectional view of a main part of a conventional paper feeding device. 9... Paper feed unit, 1o... Registration roller, 11... Static elimination brush, 12...
・Paper dust collection member, 13...Paper. Name of agent: Patent attorney Toshio Nakao and 1 other person9-
11th Children's Unit/2-11th Prefecture (A-time Enmatabu Se? Figure 2
) 3-11 years old V (Figure 3

Claims (1)

[Claims] Registration rollers feed paper in synchronization with image formation.
A paper dust removal device for a copying machine, characterized in that a static elimination brush and a paper dust collection member are brought into contact with each other.