Tri-level highlight color printing apparatus with cycle-up and c

Details Tri-level highlight color printing apparatus with cycle-up and c Tri-level highlight color printing apparatus with cycle-up and c

1987-07-28

1989-03-07

Grimley, Arthur T.

Photocopying

Including fiber optics

355 3DD, 355 14D, 430 45, G03G 1501

Patent

active

048110469

ABSTRACT:
Undesirable transient development conditions that occur during start-up and shut-down in a tri-level xerographic system when the developer biases are either actuated or de-actuated are obviated by the provision of developer apparatuses having rolls which are adapted to be rotated in a predetermined direction for preventing developer contact with the imaging surface during periods of start-up and shut-down. The developer rolls of a selected developer housing or housings can be rotated in a the contact-preventing direction to permit use of the tri-level system to be utilized as a single color system or for the purpose of agitating developer in only one of the housings at time to insure internal triboelectric equilibrium of the developer in that housing.

REFERENCES:
patent: 3392432 (1968-07-01), Naumann
patent: 3640248 (1972-02-01), Nielander
patent: 3662395 (1972-05-01), Doi et al.
patent: 3709713 (1973-01-01), Turner
patent: 3940272 (1976-02-01), Davidson
patent: 4053218 (1977-10-01), Mikolas
patent: 4078929 (1978-03-01), Gundlach
patent: 4352552 (1982-10-01), Stange
patent: 4761672 (1988-08-01), Parker et al.
U.S. Ser. No. 844,681, Filed 10/25/77, Development System, Green et al.
U.S. Ser. No. (D/85176), Copending Application, Raaped Developer Biases, Delmer G. Parker et al.
Xerox Disclosure Journal, vol. 12, Mar./Apr., 1987.

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