# US 5,707,726 A · Aluminum pipe production process, electrophotographic photosensitive member produced by the production process, and electrophotographic apparatus having the electrophotographic photosensitive member

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- Number: US 5,707,726 A
- Document ID: US5707726A
- Status: Granted
- Kind: A
- Application number: 08/662,082
- Filed: 1996-06-12
- Granted: 1998-01-13
- Earliest claimed: 1992-01-31
- Assignees: Canon Kabushiki Kaisha
- Inventors: Mutsuo Ohtaka; Hisami Tanaka; Shinichi Shibayama; Yosuke Okubo; Tatsu Nakajima
- Web page: https://patentgrep.com/patent/US5707726A

## CPC

- G03G 15/0928: {relating to the shell, e.g. structure, composition}
- B24B 5/18: involving centreless means for supporting, guiding, floating or rotating work (centreless turning B23B5/08; centreless grinding of threads B23G1/42)
- B24B 39/04: designed for working external surfaces of revolution
- G03G 5/102: {consisting of or comprising metals}
- G03G 15/751: {relating to drum (G03G15/757 takes precedence)}
- G03G 2221/183: Process cartridge
- Y10T 428/256: Heavy metal or aluminum or compound thereof
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A process for producing an aluminum pipe is disclosed which has the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling. Also, an electrophotographic photosensitive member, a device unit, an electrophotographic apparatus and a developing roll having the aluminum pipe are disclosed.

## Claims

### Claim 1

A device unit comprising an electrophotographic photosensitive member, and at least one of a charging means, a developing means, and a cleaning means, held in one unit, said unit being detachably provided in the body of an electrophotographic apparatus, wherein said developing means has an aluminum pipe prepared by a process comprising the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling.

### Claim 2

An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means for forming a latent image, a means for developing the latent image formed and a means for transferring the developed image to a transfer medium, wherein said means for developing has an aluminum pipe prepared by a process comprising the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling.

### Claim 3

A developing roll comprising an aluminum pipe prepared by a process comprising the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling.

### Claim 4 (depends on 3)

The developing roll according to claim 3, further comprising a conductive resin layer on the surface of the aluminum pipe.

### Claim 5 (depends on 3)

A developing roll according to claim 3, wherein the cutting is carried out by centerless grinding.

### Claim 6 (depends on 3)

A developing roll according to claim 3, wherein three or more rotary pressure rolls are disposed obliquely with respect to the axial direction of the aluminum pipe and are rotated together with a rotary pressure roll holder to work out the aluminum pipe.