Conductive foam rubber roller used in image formation apparatus

Details Conductive foam rubber roller used in image formation apparatus Conductive foam rubber roller used in image formation apparatus

1992-11-04

1993-08-31

Moses, R. L.

Photocopying

Contact printing

Light boxes

355259, 355271, 355296, G03G 1502, G03G 1514, G03G 1506, G03G 2100

Patent

active

052413438

ABSTRACT:
A conductive foam rubber roller is used as a charging roller, developing roller, toner-removing roller, or transfer roller in an image formation apparatus such as an electrophotographic recording apparatus, and comprises a tubular roller element made of a conductive foam rubber material and having a central bore defined by a solid skin layer having an electric resistivity considerably higher than that of a foam structure of the rubber element, and a conductive shaft on which the roller element is mounted and fixed. End sections of the skin layer are removed from the roller element such that the foam structure thereof is in direct contact with the shaft at end sections of the bore thereof. Alternatively, a conductive disc-like member having a central opening formed therein is inserted onto the shaft to be abutted against an end face of the roller element, whereby sufficient electric contact can be established between the roller element and the shaft.

REFERENCES:
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patent: 4309803 (1982-01-01), Blaszak
patent: 4967231 (1990-10-01), Hosoya et al.
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patent: 5062385 (1991-11-01), Nishio et al.
patent: 5076201 (1991-12-01), Nishio et al.
patent: 5097294 (1992-03-01), Nishio et al.
patent: 5164773 (1992-11-01), Nishio et al.
patent: 5168313 (1992-12-01), Hosaka et al.

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