Transfer system with field tailoring

Details Transfer system with field tailoring Transfer system with field tailoring

1991-12-23

1993-03-30

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355273, 355315, G03G 1516

Patent

active

051988640

ABSTRACT:
A system for tailoring electrostatic fields in and around a transfer region in an electrostatographic printing apparatus. The system includes a toner transfer system for transferring charged toner particles from an imaging surface to a copy sheet and a transfer nip and a conductive pre-nip sheet guide member, as well as a conductive post-nip sheet guide member, wherein each sheet guide member is coupled to a biasing source. The pre-nip sheet guide member is biased to a polarity similar to the polarity of the charged toner while the post-nip sheet guide member is biased to a polarity opposite the polarity of the charged toner particles. The invention provides for efficient and effective toner transfer while suppressing the effects of lateral condition of transfer biases through the copy sheet under high relative humidity conditions.

REFERENCES:
patent: 3830589 (1974-08-01), Allen
patent: 3850519 (1974-11-01), Weikel, Jr.
patent: 3924943 (1975-12-01), Fletcher
patent: 3976370 (1976-08-01), Goel et al.
patent: 4014605 (1977-03-01), Fletcher
patent: 4055380 (1977-10-01), Borostyan
patent: 4338017 (1982-07-01), Nishikawa
patent: 4823158 (1989-04-01), Casey et al.
patent: 4849784 (1989-07-01), Blanchet-Fincher et al.

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