Photocopying – Contact printing – Light boxes
Patent
1990-04-30
1992-02-18
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118661, 430117, G03G 1510
Patent
active
050898531
ABSTRACT:
An electrophotographic printing apparatus includes a liquid development unit for developing a latent electrostatic image formed on a photoconductive member with liquid developer. The liquid development unit has a developer roller whose surface faces the photoconductive member with a small gap spacing. A pair of spacer films are provided between the developer roller and photoconductive member at positions corresponding to axially end portions of the developer roller to determine the gap spacing. A pair of repellent band members are formed on the surfaces of the developer roller at positions between a developing area and the portion contacting the spacer film. A pair of repellent band members are also formed on the surface of the photoconductive member at positions corresponding to the repellent band member of the developer roller. The pairs of repellent band members prevent the accumulation of the liquid developer and further prevent the closing of the small gap spacing between the surface of the image forming area and developing area.
REFERENCES:
patent: 3957510 (1976-05-01), Hermanson
patent: 3975352 (1976-08-01), Yoerger et al.
patent: 4241694 (1980-12-01), Cormier et al.
Grimley A. T.
Horgan Christopher
NEC Corporation
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