Electrophotography – Having particular structure – Modular or displaceable
Patent
1997-09-22
2000-03-07
Pendegrass, Joan
Electrophotography
Having particular structure
Modular or displaceable
399167, G03G 1500, G03G 2118
Patent
active
060351594
ABSTRACT:
An electrophotographic image forming apparatus which forms an image on a recording medium and to which a process cartridge can detachably be mounted includes (a) a cartridge mounting portion capable of detachably mounting a process cartridge including an electrophotographic photosensitive drum, a process device acting on the photosensitive drum, and a projection having a first-twisted-polygonal prism shape provided on one longitudinal end of the photosensitive drum, (b) a rotatable rotary member having a first twisted hole of polygonal cross-section, (c) a rotatable coupling shaft supported for axial movement and being provided at its one end with a second-twisted-polygonal prism shape fitted into the first twisted hole of the rotary member, and being provided at its other end with a second twisted hole of polygonal cross-section for engaging with and disengaging from the projection having the first-twisted-polygonal prism shape and having substantially the same twisted angle and twisted direction as those of the first-twisted-polygonal prism shape, (d) a spring member for biasing the coupling shaft toward the photosensitive drum, (e) an axial direction shifter for shifting the second twisted hole and the projection having the first-twisted-polygonal prism shape relative to each other between a first position and a second position, and (f) a conveyor for conveying the recording medium.
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Patent Abstracts of Japan, vol. 014, No. 563, Dec. 14, 1990, Abstract of Jap. Pat. 02-240411 pub'd Sep. 25 1990.
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Azuma Jun
Goto Takashi
Murayama Shigeo
Nishikawa Masaaki
Canon Kabushiki Kaisha
Pendegrass Joan
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