Photocopying – Contact printing – Light boxes
Patent
1989-02-28
1990-09-18
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355311, G03G 1514
Patent
active
049581945
ABSTRACT:
A transferring device for transferring on a record paper a toner image formed onto an image forming member is disclosed. The transferring device comprises a transfer belt with a dielectric layer formed on a conduction belt member; a driving device for running the transfer belt; a transfer roller for contacting the transfer belt to an image forming member with pressure; a corona charges arranged at a position opposite to the transfer belt for charging the transfer belt with a charge having a polarity opposite to the charging polarity of the toner; a grid electrode arranged between the corona charger and the transfer belt; a plurality of bias sources connected to the grid electrode for biassing the grid electrode at respective potentials; and a change-over circuit for changing over the connection between the grid electrode and the bias source, whereby the grid potentials are selectively changed over in accordance with the characteristics of a record paper to be used.
REFERENCES:
patent: Re30535 (1981-03-01), Kuroishi et al.
patent: 3996466 (1976-12-01), Davis
patent: 4114536 (1978-09-01), Kaneko et al.
patent: 4213693 (1980-07-01), Imai et al.
patent: 4563076 (1986-01-01), Takahashi et al.
Kaieda Shozo
Okajima Hideo
Braun Fred L.
Hoffman Sandra L.
Kentek Information Systems Inc.
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