Photocopying – Contact printing – Light boxes
Patent
1992-04-15
1993-01-12
Moses, Richard L.
Photocopying
Contact printing
Light boxes
355 24, 355274, G03G 1500
Patent
active
051794179
ABSTRACT:
An apparatus for printing on opposite surfaces of a strip of printing paper using two electrophotographic printing units wherein each printing operation is of high quality and thermal damage to the printing is minimized. The apparatus includes a first electrophotographic printing unit for printing on the front surface of the printing paper, a buffer unit for temporarily holding the printing paper discharged outside of the first electrophotographic printing unit, a turn unit for turning over the printing paper, and a second electrophotographic printing unit for printing the reverse surface of the printing paper. A toner having a low melting temperature is employed for each of the first and second electrophotographic printing units so that developing treatment is conducted only with the aid of a heat roll but without any use of a preheating plate. A back-up roll adapted to cooperate with the heat roll is coated with a tetrafluoroethylene-based synthetic resin. The second electrophotographic printing unit is provided with a paper presser for squeezing the printing paper against a photosensitive drum only within the printing width range. A retract mechanism is operatively connected to the paper presser.
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Akinaga Katsuhiro
Akutsu Masaaki
Kikuchi Yasuo
Kurobane Motoji
Sugaya Tomio
Hitachi Koki Co,. Ltd.
Moses Richard L.
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