Transfer, detac polarity switching

Details Transfer, detac polarity switching Transfer, detac polarity switching

1992-06-01

1993-04-20

Moses, R. L.

Photocopying

Contact printing

Light boxes

355274, G03G 1501, G03G 1514

Patent

active

052047300

ABSTRACT:
Method and apparatus for providing multiple colors in a single pass of a copy sheet through a transfer station by switching the polarity of a transfer corotron and automatically adjusting the output of the detac corona device. In particular, a single power supply including high voltage switches responds to color selections to change the polarity of a transfer corotron to charge a copy sheet for toner transfer, and a current sense and precision rectifier stage responds to the copy sheet charge to provide a suitable detac charge independent of the transfer corotron polarity.

REFERENCES:
patent: 4140962 (1979-02-01), Quinn
patent: 4190348 (1980-02-01), Friday
patent: 4627703 (1986-12-01), Suzuki et al.
patent: 4714978 (1987-12-01), Coleman
patent: 4791528 (1988-12-01), Suzuki et al.
patent: 4868608 (1989-09-01), Allen et al.

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