JPH10207292A - Flange for electrophotographic photoreceptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an additional member and process, to make the amount of use of an adhesive and its sticking to the surface of a photoreceptor extremely little and to prevent the occurrence of a failure in conduction caused by the sticking of the adhesive to a ground electrode by changing the punching directions and angles of the pawls of electrode plates, in accordance with places. SOLUTION: Pawl parts 8-15 are provided on the electrode plate 5 and pawl parts 16-19 are provided on an electrode plate 6. The pawl parts 8, 10, 12 and 14 on the electrode plate 5 are bent backward, but their bending angles are different from each other. Because punching before the pawl parts are bent is attained from the back to the front and the burr of punching is extended forward. Similarly, the pawl parts 9, 11, 13 and 15 are bent forward, but their bending angles are different from each other. The pawl parts 16-19 on the electrode plate 6 are formed by punching, to be alternately different from each other in direction, in the same direction as those of the pawl parts 8-15 on the electrode plate 5 and bent at angles different from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange mounted on both ends of a drum of an electrophotographic photosensitive member, and an assembling technique of the flange and the photosensitive drum.

[0002]

2. Description of the Related Art In the field of electrophotographic photoreceptors, various units are arranged around a photoreceptor drum having a photosensitive layer on an outer surface and a flange generally mounted on an opening at both ends, and the photoreceptor drum rotates. However, these units perform necessary or desired processing such as image exposure, development, transfer, charge elimination, and cleaning on the surface photosensitive layer. Therefore, the photosensitive drum is generally supported and rotated by a rotating shaft or a rotating bearing provided on a flange mounted on both ends or a power transmitted through a gear. The center of the flange must always hold the center of the rotation axis for smooth and unimpeded rotation of the photosensitive drum. Furthermore, since a ground electrode for taking ground from the photoconductor drum is mounted on the flange, it is necessary to mount the flange including proper mounting of the ground electrode.

Recently, as electrophotographic copying machines have become smaller and lighter, many photoreceptors, which have difficulty in shape retention using an organic photosensitive material (OPC), have been used in many cases. A resin product is generally used as a flange used for an OPC photosensitive drum, and an adhesive is used as a mounting and assembling method. The board is fixed. When mounting a resin flange with such an adhesive, a large amount of the adhesive is used, and the adhesive adheres to the surface of the photoreceptor, or the adhesive is applied to a metal plate as a ground electrode attached to the flange. There are problems such as adhesion and poor conduction.

In order to improve this, for example, Japanese Patent Laid-Open Publication No.
No. 0361 discloses an imaginary part formed by these projections having a plurality of projections (1) at the edge of the plate at the fitting portion of the flange to the photosensitive drum as shown in FIG. A portion where the projection contacts and passes through a resin flange to which a metal plate whose diameter is larger than the inner diameter of the photosensitive drum by 0.1 mm or more is fixed so that the center of the circle of the projection coincides with the center axis of the flange. Avoid the protrusion, fit the fitting part of the flange so that the protrusion does not touch the adhesive on the inner surface of the photosensitive drum coated with the adhesive discontinuously in the circumferential direction, and the tip of the protrusion is on the inner surface of the photosensitive drum. JP-A-6-332347 describes that a cylindrical photosensitive member having a photosensitive layer formed on the outer surface is provided with a support shaft at both ends thereof. An image forming apparatus in which a photoreceptor is inserted and inserted. In the image bearing member, a groove is provided in a portion of the flange member to be fitted into the cylindrical photoreceptor, and a resilient ring-shaped member such as a ring-shaped light commercial member is provided so as to be in pressure contact with the inner surface of the cylindrical photoreceptor at the time of fitting and insertion. There is described an image holding member in which a coil spring, a member formed in a hollow shape, and a member formed in a U-shape in a radial direction cross section are disposed in a groove.

However, in the technique described in Japanese Patent Application Laid-Open No. 6-332347, a resilient ring-shaped member for pressing against the inner surface of the photoreceptor must be additionally provided, and a groove for accommodating the resilient ring-shaped member in the flange member. Must also be drilled. Further, as shown in FIG. 5, in the technique disclosed in Japanese Patent Application Laid-Open No. HEI 6-110361, the projections (1) of the electrode plate attached to the photosensitive drum flange of the electrophotographic photosensitive member device face in the same direction. In this case, the pressing direction is the same. In this case, as shown in FIG. 6, since a plurality of locations are fixed on the same circumference, when an external force is applied when the resinous flange contracts at a low temperature. There is a risk that the flange will wobble (2) and the coaxiality will be worse,
Therefore, in order to prevent this, as shown in FIG. 7, auxiliary fixing of the adhesive (3) was required.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems in the prior art, and further, does not require additional members, does not require additional steps, and uses an adhesive. The amount required is small, the adhesive is less likely to adhere to the surface of the photoreceptor, the adhesive is less likely to adhere to the metal plate serving as the ground electrode attached to the flange, causing poor conduction, and even if external force is applied. An object of the present invention is to provide a flange which is mounted on both ends of a drum of an electrophotographic photosensitive member, and a technique for assembling the flange and the photosensitive drum without causing the flange to fluctuate.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide (1) an electrode in which the direction of pressing the nail and the angle of the nail are changed depending on the location in the flange mounted on the photosensitive drum of the electrophotographic photosensitive member device. A flange for an electrophotographic photoreceptor characterized by comprising a plate. ", (2)" The burrs height after pressing of the nail is set to 0.02 to 0.1 mm. (1) Flange for electrophotographic photosensitive member according to item (1)), (3) "Flange for electrophotographic photosensitive member according to item (1), wherein a plurality of electrode plates are provided." (4) The electrophotographic photosensitive member flange according to the above (1), wherein the first and second claw portions of the two electrode plates are alternately positioned. Is done. That is, in the present invention, in order to solve the above-mentioned problems, as a result of repeatedly examining the punching direction and angle of the nail of the electrode plate, the punching direction and angle of the nail of the electrode plate are changed depending on the location, and the bonding is performed. It is possible to stabilize the coaxiality even without the agent.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows one embodiment of a flange for an electrophotographic photosensitive member. The number of the electrode plates may be one, but in the flange of this example, the electrode plates are composed of two plates, the electrode plate (5) and the electrode plate (6). Thus, a more stable anti-torque coaxiality can be obtained. The electrode plate (5) is provided with claw portions (8) to (15), and the electrode plate (6) is provided with claw portions (16) to (1).
9) is provided. As shown in FIG. 2, the claw portions (8), (10), and (1) on the electrode plate (5) in this example.
2) (14) is bent backward,
The bending angles are different. Similarly, the claws (9) (1
1) (13) and (15) are bent forward, but the bending angles are different. In the figure, reference numeral (20) denotes a gear for transmitting rotational power to the photoconductor, and reference numeral (21) denotes a ground electrode.

The claw portions (8), (10), (12) and (14) are formed by pressing the press before being bent from the rearward direction to the frontward direction. Therefore, as shown in FIG. (22) extends forward. Further, the claw portions (9), (11), (13), and (15) are formed by pressing the press before being bent from the front direction to the rear direction. Therefore, as shown in FIG. 22) extends rearward.

Claw portions (16) to (1) of the electrode plate (6)
9) is also formed by pressing in different directions in the same direction as the claw portions (8) to (15) of the electrode plate (5), and is bent at different angles. The electrode plate (6) may be incorporated in any manner,
More preferably, the claw portions (16) to the electrode plate (6)
(19) corresponds to the claw portions (8) to (1) in the electrode plate (5).
Assemble so that it is in the middle of the position of 5) and the claw portions (16) to (19) are located in the middle of the claw portions (8) to (15). Thus, when the flange is mounted inside the electrophotographic photoreceptor, the claws (8) to (19) bite in a substantially uniform distribution without being unevenly distributed on the respective portions of the inner wall of the photoreceptor. More complete fixation is ensured, and the coaxiality of the electrophotographic photosensitive member with respect to torque after the flange is mounted can be further increased.

As shown in FIG. 4, in the present invention, the height of the burrs (22) generated by press punching is more preferably 0.02 to 0.1 mm. The burrs (22) ensure even more complete fixing between the claws (8) to (19) and the inner wall of the photoreceptor when the flange of the present invention is mounted inside the electrophotographic photoreceptor. If the burring height is less than 0.02 mm, the effect is small, and if the burring height is 0.1 mm, the material is too soft, and even if the press punching process can be performed satisfactorily, the front of each claw portion can be obtained. There is a case where the bending process in the forward and backward directions is disturbed and hinders the bending process.

As described above, the claw portions of the electrode plate attached to the photosensitive drum flange of the conventional electrophotographic photosensitive member device are oriented in the same direction, and the pressing direction is the same. Since the resin flange is fixed at a plurality of locations on the circumference, when the resin flange shrinks at low temperature, the flange will wobble when external force is applied, and the coaxiality between the photosensitive drum and the flange may be deteriorated, which is prevented. However, in order to solve this problem, the direction and angle of the press of the nail of the electrode plate are changed depending on the location, and the adhesive is eliminated. However, there is an effect that the coaxiality can be stabilized.

According to the second aspect of the present invention, by setting the height of the burrs for pressing the nails to 0.02 to 0.1 mm, an effect of obtaining effective biting inside the drum can be obtained.

Further, the invention described in claim 3 is the invention according to claim 1.
By providing a plurality of the electrode plates, the effect of obtaining a more stable torque coaxiality can be obtained, and the invention according to claim 4 provides the first and second claw portions of the electrode plate. By alternately positioning them, the effect can be increased.

[0015]

As is apparent from the above detailed and concrete description, in the flange of the first aspect, since the pressing direction and the angle of the claw of the electrode plate are changed depending on the location, the flange is moved toward the inside of the drum. It can be firmly fixed without using an adhesive without fixing points being arranged on the same circumference. In addition, by adopting this method, it is easy to cope with recycling. Further, in the flange of the second aspect, since the height at which the electrode plate is changed by pressing is set to 0.02 to 0.1 mm, the biting inside the drum can be firmly stabilized. Since the flange is provided with a plurality of electrode plates, the effect of the flange of claim 1 can be increased.
Since the positions of the claws of the two electrode plates are alternately shifted, the effect of the flange of claim 1 can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic view of one flange example according to the present invention.

FIG. 2 is a view illustrating a claw portion of a flange according to the present invention.

FIG. 3 is a view for explaining the direction of the claw portion of the flange according to the present invention and the direction of the press-cutting burrs at the claw portion.

FIG. 4 is a view for explaining the height of the press-release burrs in the claws of the flange according to the present invention.

FIG. 5 is a schematic view of a conventional flange.

FIG. 6 is a view for explaining a state in which an external force is applied to a conventional fitted flange, the flange fluctuates, and coaxiality deteriorates.

FIG. 7 is a schematic diagram when a flange is press-fitted using a conventional adhesive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protrusion 2 Flange wobble 3 Adhesive 5 Electrode plate 6 Electrode plate 8 Claw 9 Claw 10 Claw 11 Claw 12 Claw 13 Claw 14 Claw 15 Claw 16 Claw 17 Claw 18 Claw 19 Claw Part 20 gear 21 earth electrode 22 burrs by press punching

Claims (4)

[Claims] 1. An electrophotographic photoreceptor comprising: a flange mounted on a photosensitive drum of an electrophotographic photoreceptor device; and an electrode plate having a nail press-out direction and a nail angle changed depending on a location. For flange. 2. The height of burrs after pressing of the nails is 0.0
2. The flange for an electrophotographic photosensitive member according to claim 1, wherein the thickness is 2 to 0.1 mm. 3. The electrophotographic photosensitive member flange according to claim 1, wherein a plurality of electrode plates are provided. 4. The electrophotographic photosensitive member flange according to claim 1, wherein the first and second claw portions of the two electrode plates are alternately located.