Apparatus for controlling toner replenishment in electrostatogra

Details Apparatus for controlling toner replenishment in electrostatogra Apparatus for controlling toner replenishment in electrostatogra

1987-05-21

1989-07-11

Grimley, Arthur T.

Photocopying

Contact printing

Light boxes

355208, 355246, G03G 1500

Patent

active

048476595

ABSTRACT:
An electrostatographic machine replenishes the toner in a developer mix proportionally in response to a toner depletion signal having a value indicative of the rate of toner usage. A second signal is produced having a value proportional to toning contrast; and the contrast of proportionality between toner replenishment and the depletion signal is adjusted in response to the second signal value. The toner depletion signal may be indicative of the number of character print signals applied to a print head; the characters preferably being pixels to be toned.

REFERENCES:
patent: 3529546 (1967-09-01), Kollar
patent: 3674353 (1972-07-01), Trachtenberg
patent: 4141645 (1979-02-01), Reid
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4318610 (1982-03-01), Grace
patent: 4413264 (1983-11-01), Cruz-Uribe et al.
patent: 4432634 (1984-02-01), Tabuchi
patent: 4492179 (1985-01-01), Folkins et al.
patent: 4607944 (1986-08-01), Rushing
patent: 4610532 (1986-09-01), De Schamphelaere et al.
patent: 4707748 (1987-11-01), Ohtsuka et al.

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