Multi-color electrostatic copying apparatus

Details Multi-color electrostatic copying apparatus Multi-color electrostatic copying apparatus

1980-04-22

1982-09-28

Braun, Fred L.

Photocopying

Including fiber optics

118653, 118656, 118656, 118661, 209127R, 209128, 209129, 209130, 355 3DD, G03G 1501

Patent

active

043516041

ABSTRACT:
First and second developing units (66), (67) apply toners of first and second colors respectively to a photoconductive drum (61) carrying a bipolar electrostatic image to form a bicolor toner image. A small amount of the first toner is scraped off the drum (61) in the second developing step and becomes mixed with the second toner in the second developing unit (67). The admixed first toner is separated and removed from the second toner by a separation member in the form of a roller, belt or mesh covered electrode (81) which is charged to a polarity opposite to the first toner and electrostatically attracts the same while repelling the second toner.

REFERENCES:
patent: 3306193 (1967-02-01), Rarey et al.
patent: 3477568 (1969-11-01), Madrid
patent: 3662884 (1972-05-01), Robinson
patent: 3911865 (1975-10-01), Volkers
patent: 3960738 (1976-06-01), O'Brien et al.
patent: 4101215 (1978-07-01), Fottner et al.
patent: 4142165 (1979-02-01), Miyakawa et al.
patent: 4148224 (1980-02-01), Sakai
patent: 4226524 (1980-10-01), Hashimoto
patent: 4264185 (1981-04-01), Ohta

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