Photocopying – Contact printing – Light boxes
Patent
1993-12-30
1995-03-28
Braun, Fred L.
Photocopying
Contact printing
Light boxes
G03G 1500, G03G 2100
Patent
active
054022070
ABSTRACT:
In one embodiment of the invention, the bore in the plastic bushing of a plastic gear attached to a photoreceptor drum in a toner cartridge is enlarged. A metal bushing is inserted within the plastic bushing and allows the gear to rotate around the drum shaft without wearing as quickly. The metal bushing, by pressing against the metal spring-clip contact, ensures the electrical ground connection between the drum and stationary drum shaft. In a second embodiment, the entire gear is manufactured from metal. A conductive joining material, metal prongs, or knurls on the outer surface of the metal bushing contact or scratch into the inner wall of the drum and provide the electrical ground connection between the inner wall of the photoreceptor drum and the drum shaft. On the nonconductive gear side of the drum, the hole in the cartridge wall which receives the gear shaft is lined with a bushing to prevent wear. A gear aligner device which extends into the gear shaft may be alternatively used at this location to align the gear correctly and prevent deforming of the hole in the cartridge wall.
REFERENCES:
patent: 4839690 (1989-06-01), Onoda et al.
patent: 4951599 (1990-08-01), Damji
patent: 4975744 (1990-12-01), Ebata et al.
patent: 5019861 (1991-05-01), Surti
patent: 5132728 (1992-07-01), Suzaki et al.
patent: 5142322 (1992-08-01), Surti
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