Developer apparatus having toner concentration control

Details Developer apparatus having toner concentration control Developer apparatus having toner concentration control

1996-03-01

1997-05-27

Grimley, Arthur T.

Electrophotography

Control of electrophotography process

Control of developing

G03G 1508

Patent

active

056341741

ABSTRACT:
A developer unit of the present invention has an agitating paddle which agitates a developer containing a magnetic carrier and a non-magnetic toner, and a toner is supplied from the toner hopper according to an output of a toner concentration sensor. After an agitation is finished which is performed when the power is turned on, the agitating paddle is periodically operated to agitate the developer. During the agitation, a toner concentration controller shifts a reference level with which the output of the toner concentration sensor is compared from a predetermined level to a higher level and then stepwisely returns it to the predetermined level.

REFERENCES:
patent: 4200665 (1980-04-01), Suzuki et al.
patent: 4974025 (1990-11-01), Kikuchi
patent: 5031123 (1991-07-01), Narukawa
patent: 5166729 (1992-11-01), Rathbun et al.
patent: 5508793 (1996-04-01), Kimura et al.
patent: 5519316 (1996-05-01), Hagiwara et al.

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