Control apparatus for controlling density of toner in a developi

Details Control apparatus for controlling density of toner in a developi Control apparatus for controlling density of toner in a developi

1989-04-11

1990-09-11

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355207, 355246, G03G 2100

Patent

active

049566695

ABSTRACT:
A control apparatus for controlling concentration of toner incorporated in developing material in a developing unit by means of controlling a toner replenishment to supply the toner in accordance with a toner concentration detected by a toner concentration detecting sensor in a first state wherein the detecting signal of the sensor is normal and to supply the toner by a constant volume at the predetermined period in a second state wherein the detecting signal of the sensor is abnormal.

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patent: 4572654 (1986-02-01), Murai et al.
patent: 4579442 (1986-04-01), Minejima
patent: 4592645 (1986-06-01), Kanai et al.
patent: 4646679 (1987-03-01), Ohno et al.
patent: 4708458 (1987-11-01), Ueda et al.

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