Photocopying – Contact printing – Light boxes
Patent
1988-02-09
1990-09-18
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355 23, 355 24, 355319, 355320, 358300, G03G 2100
Patent
active
049581872
ABSTRACT:
In a duplex image forming apparatus, first and second image forming devices are arranged respectively in upstream and downstream sides of a moving direction of a transfer member. Each image forming device includes an image bearing member, a developer for forming on the image bearing member a toner image corresponding to first and second information signals, respectively, and a transfer device for transferring the respective toner images to respective sides of the transfer member. A reader is provided for reading a first side of an original and, at a point of time after reading of the first side begins, a second side of the original. The length of time required to move the transfer member from the first transfer station to the second transfer station is equal to the length of time between beginning to read the first side of the original and beginning to read the second side of the original. Advantageously, the electric polarity used to transfer the first toner image to the first side of the transfer member is opposite to that required to transfer the second toner image to the second side of the transfer member.
REFERENCES:
patent: 3536398 (1970-10-01), Bhagat
patent: 3580670 (1971-05-01), Bhagat
patent: 3697171 (1972-10-01), Sullivan
patent: 3775102 (1973-11-01), Punnett
patent: 3936171 (1976-02-01), Brooke
patent: 4076407 (1978-02-01), Place
patent: 4413899 (1983-11-01), Karasawa et al.
patent: 4571636 (1986-02-01), Itoh
patent: 4674866 (1987-06-01), Tanaka
Nakahata Kimio
Tsuchiya Hiroaki
Braun Fred L.
Canon Kabushiki Kaisha
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