Photocopying – Contact printing – Light boxes
Patent
1992-04-20
1994-03-29
Braun, Fred L.
Photocopying
Contact printing
Light boxes
G03G 1506, G03G 2100
Patent
active
052989488
ABSTRACT:
A developing device includes a developing roller for applying a developing agent to an electrostatic latent image on an image carrier. The developing roller is movable between a first position where the developing roller faces the image carrier through a gap therebetween and a second position where the developing roller is separated from the first position. The developing device further includes a positioning member associated with the developing roller for making the gap uniform along the longitudinal direction of the developing roller at the first position to allow the applying of the developing agent to the image carrier, a first urging mechanism having a first urging force for urging the developing roller to move from the first position to the second position, and a second urging mechanism responsive to the rotation of the developing roller and having a second urging force greater than the first urging force for urging the developing roller to move from the second position to the first position.
REFERENCES:
patent: 4835565 (1989-05-01), Nagatsuna et al.
patent: 4891674 (1990-01-01), Seyfried
patent: 4951093 (1990-08-01), Ishii et al.
patent: 4989037 (1991-01-01), Nagatsuna
patent: 5070366 (1991-12-01), Tsuchiya
Braun Fred L.
Kabushiki Kaisha Toshiba
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