Image forming apparatus having a plurality of developing units e

Details Image forming apparatus having a plurality of developing units e Image forming apparatus having a plurality of developing units e

1989-05-25

1990-09-11

Moses, R. L.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

355246, 355326, G03G 1508

Patent

active

049553178

ABSTRACT:
An electrophotographic image forming apparatus employing a two-component developer including toner and carrier comprises: a developing unit containing the developer; a toner concentration sensor provided on the developing unit for detecting the concentration of the toner included in the developing unit; a comparing apparatus for comparing a value detected by the toner concentration sensor with a prescribed concentration reference value; a supplying apparatus for supplying toner to the developing unit; a controlling apparatus for controlling toner supply by the supplying apparatus based on the result of comparison by the comparing apparatus; and a detecting apparatus for detecting whether or not a detachable member whose attachment influences the detection of the toner concentration sensor is attached near the developing unit. The controlling apparatus changes the amount of toner supply by the supplying apparatus based on detected value from the toner concentration sensor in response to the detection output from the detecting apparatus.

REFERENCES:
patent: 4342283 (1982-08-01), Terashima
patent: 4592645 (1986-06-01), Kanai et al.
patent: 4734737 (1988-03-01), Koichi
patent: 4875079 (1989-10-01), Bisaiji et al.

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