JPS59208569A - Cleaner of photosensitive body of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent deficient cleaning throughout all the span by joining 2 parallel elastic plates at both ends, forming a proper number of slits in the longitudinal direction from the top, fixing their bases to an arm, and joining a cleaning blade on one of the plates. CONSTITUTION:As a photosensitive body 1 rotates, the contact line P of a blade 13 and the body 1 undergoes a force in the tangent direction, but since 2 elastic plates 10, 11 have a U-shape, and high in rigidity against bending, the free end of the blade 13 performs parallel motion, as shown in the figure. Therefore, an angle theta' formed with the tangent plane at the contact line P' of the edge of the blade 13 and the rotating body 1, and the top face of the blade 13 on the upstream side changes very little. Since the plates 10, 11 have a proper number of slits 12 formed in the longitudinal direction from the top, even if any local force exerts on the surface of the body 1, only a narrow part of the plates 10, 11 deforms, therefore, a greater part of the blade 13 uniformly contacts the body, and deficient cleaning can be thus prevented throughout all the width.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a photoreceptor cleaning device for an electrophotographic copying machine.

(Prior art) When cleaning the toner remaining on the photoreceptor of a photoreceptor of a copier in conventional electronic copying using the trailing method, the base of the arm 2 disposed at a predetermined position on the outer circumference of the photoreceptor drum 1 is moved to the arm 2 as shown in FIG. is pivotally attached to the surface of the photoreceptor drum 1 so as to be able to swing, the base of one thin metal plate 3 is fixed to the tip thereof, and a blade 4 made of rubber or the like is fixed to the tip of the thin metal plate 8.
The arm 2 was pulled by a spring 5 and the blade was brought into contact with the surface of the photoreceptor drum 1 with a constant pressure. The thin metal plate 8 is bent by the force, and the angle of contact between the tip of the blade 4 and the photoreceptor l is reduced, resulting in a decrease in cleaning performance. Especially when there is little toner on the photoconductor (white image), if a minute area with a lot of toner (fine line) suddenly comes, when there is not enough toner, the frictional force is large, so the blade tip is dragged and the contact force is reduced. , the cleaning action is reduced. If there is an area with a lot of toner, it has the disadvantage of causing Krie-Jung defects.

(Purpose) When cleaning a photoreceptor using a trailing method, the present invention maintains a constant contact angle between the tip of the blade and the photoreceptor even if the blade is displaced by frictional force in the direction of movement of the photoreceptor. The purpose of this is to prevent cleaning failures by allowing the edge to uniformly contact the surface of the photoreceptor over the entire span.

(composition) The configuration of the present invention will be explained below based on one embodiment.

2 to 4 show an embodiment of the present invention, in which 10.11 are two elastic plates having approximately the same width as the photoreceptor 1;
Arranged in parallel at regular intervals, their tips are connected together,
An appropriate number of slits 12 are formed from the tip in the longitudinal direction,
A blade 18 having approximately the same width as the photoreceptor l is attached to one elastic plate 10.
are superimposed and fixed, and the tip thereof protrudes by a certain length l from the elastic plate IO and is fixed to the base arm 14. The arm 14 can swing relative to the surface of the photoreceptor 1 about a shaft 15 at its lower end.

Next, the effect will be explained. When the photoreceptor 1 rotates, the contact point P between the blade 13 and the photoreceptor 1 receives a force in the tangential direction due to frictional force due to the rotation of the photoreceptor 1.
．． Since the blade 11 is U-shaped and the blade 18 is only connected to one elastic plate 10, most of the force acting on the tip of the blade 18 is carried by the U-shaped elastic plate 1.0.11, which controls its deformation. Since the free end length l of the blade 13 is small, the free end of the blade 18 moves in parallel from the state shown in FIG. 8 to the state shown in FIG.
The angle θ' formed between the tangent to the point P' where the edge portion 18a contacts the photoreceptor 1 and the side surface of the upstream tip end of the blade 13 hardly changes.

Further, since the elastic plate 10.11 has an appropriate number of slits 12 formed from the tip in the longitudinal direction, even if a local force is applied near the center of the photoreceptor, the elastic plate 10.11 has a narrow width in that area. Since only the deformation is required, the rigidity of the elastic plates 10 and 11 is lowered, and the blade 18 comes into uniform contact over the entire span of the surface of the photoreceptor 1, thereby preventing cleaning failures. The elastic plate has a thickness of 0.1 mm and a length of 25 mm.

Slit interval 10 tan, fled span 810r
Good results were obtained with a blade thickness of 3 m.

(Effects) According to the present invention, the blade in contact with the photoreceptor is one of two elastic plates, the tips of which are connected and arranged in parallel, an appropriate number of slits are formed from the tip in the longitudinal direction, and the base is fixed to the arm. The tip of the blade protrudes, so even if the tip of the blade is pulled by the movement of the photoconductor, it will move in parallel, and the contact angle with the photoconductor will be constant, reducing the rigidity of the parallel elastic plate. The blade can be brought into uniform contact over the entire span of the body surface, and cleaning defects can be reliably prevented.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional device, Fig. 2 is a perspective view of an embodiment of the present invention, Fig. 8 is a sectional view taken along line A-A when the photoreceptor is stopped in Fig. 2, and Fig. 4 is a sectional view of the photoreceptor rotating. It is an AA side sectional view when doing so. ■...Photoreceptor, 10.11...Elastic plate, 12...
Slit, 18...Blade, 14...Arm, 1
5...Axis, 16...Spring. Fig. 1 Fig. 2 6

Claims (1)

[Claims] Two bullet plates are arranged in parallel at regular intervals, the tips are connected together, the base is fixed to the arm, the blade is joined to one of the elastic plates, and the tip protrudes from the elastic plate to create an edge part. A photoconductor cleaning device for an electrophotographic copying machine, in which a suitable number of slits are formed in two elastic plates and a tip connecting portion in a direction perpendicular to the longitudinal direction.