Photocopying – Contact printing – Light boxes
Patent
1992-07-06
1993-02-16
Moses, Richard L.
Photocopying
Contact printing
Light boxes
355271, 355274, G03G 1501
Patent
active
051875365
ABSTRACT:
An image forming apparatus includes first and second image bearing members; movable carrying member for carrying a transfer material through a first transfer position for electrostatically transferring a first image from the first image bearing member to the transfer material and through a second transfer position, downstream of the first transfer position with respect to a movement direction of the carrying member, for electrostatically transferring a second image from the second image bearing member onto the transfer material; wherein the apparatus is operable in a first mode wherein the images are transferred onto the transfer material both at the first and second transfer positions and in a second mode wherein no image is transferred onto the transfer material at the first transfer position, and the image is transferred onto the transfer material at the second transfer position; wherein differences in surface potentials of the transfer material immediately before and after the transfer material passes through the first transfer position in the first mode and the second transfer position in the second mode, are substantially the same.
REFERENCES:
patent: 4531828 (1985-07-01), Hoshino
patent: 4660077 (1987-04-01), Kawamura et al.
patent: 4809037 (1989-02-01), Sato
patent: 4887101 (1989-12-01), Hirose et al.
patent: 5041877 (1991-08-01), Matsumoto
Hasegawa Takashi
Inoue Masahiro
Canon Kabushiki Kaisha
Moses Richard L.
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