Two color electrostatographic apparatus

Details Two color electrostatographic apparatus Two color electrostatographic apparatus

1979-05-14

1981-04-28

Braun, Fred L.

Photocopying

Including fiber optics

118661, 355 3DD, 355 10, G03G 1501

Patent

active

042641853

ABSTRACT:
An imaging unit forms a bipolar electrostatic image of a two color original document on a photoconductive drum (12). A first developing unit (13) applies a toner (16) of a first color and polarity to the drum (12) and a second developing unit (14) applies a toner (17) of a second color and polarity to the drum (12) to form a two color electrostatic image which is transferred and fixed to a copy sheet. A bias voltage of the first polarity is applied to the second developing unit (14) to repel the toner (16) of the first color and polarity against the drum (12) and prevent degradation of the first color toner image. A bias voltage of the second polarity is applied to the first developing unit (13) to prevent contamination of the first color toner (16) with the second color toner (17).

REFERENCES:
patent: 3045644 (1962-07-01), Schwertz
patent: 3601092 (1971-08-01), Satomi
patent: 3687109 (1972-08-01), Egnaczak
patent: 3702483 (1972-11-01), Fantuzzo
patent: 4189224 (1980-02-01), Sakai

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