Transfer system for electrophotographic print engine

Details Transfer system for electrophotographic print engine Transfer system for electrophotographic print engine

1988-03-11

1990-06-05

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355271, 355273, 355327, 430 45, 430109, G03G 1514, G03G 1501

Patent

active

049318390

ABSTRACT:
A transfer mechanism for a full color double transfer electrophotographic print engine. Relatively conductive developer materials having successively increasing triboelectric charge characteristics are used to develop sequential images. Conductive plates displaced away from the transfer station along the direction of travel of the transfer belt are used as one electrode for applying an electrostatic field at each transfer station. A parameter of the transfer mechanism is a bulk resistivity of the transfer belt in the range of 10.sup.7 to 10.sup.10 ohm-centimeters and a surface resistivity for the belt in the range of 10.sup.7 to 10.sup.10 ohms per square. A selectively operable compression roller, compressing paper and transfer belt against a rubberized idling roller at one of the transfer stations increase dwell time in the transfer station. The compression roller automatically falls to a cleaning station where it is rotated by another rotary member to clean it between transfers. The use of conductive developer materials also tends to eliminate halo problems common in color electrophotography.

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patent: 4708460 (1987-11-01), Langdon
patent: 4809038 (1989-02-01), Yamamoto et al.

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