Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-09-01

2009-10-20

Gray, David M (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S028000, C399S029000, C399S061000

Reexamination Certificate

active

07606506

ABSTRACT:
In an image forming apparatus, in each of a cyan image forming unit, a magenta image forming unit, a yellow image forming unit, and a black image forming unit, during a non-development period during which no toner is discharged out of a development unit, when toner in the development unit is agitated with an agitation roller, every time the drive time of a development motor for driving the agitation roller is counted, the drive time is stored on an accumulative basis in an EEPROM; with respect to the developer unit of which the drive time has become equal to or longer than a predetermined period, a predetermined amount of toner is supplied thereto and the predetermined amount of toner is discharged therefrom, and thereafter the stored drive time is reset.

REFERENCES:
patent: 5592270 (1997-01-01), Takai et al.
patent: 7092648 (2006-08-01), Choi
patent: 2006/0029405 (2006-02-01), Tanaka et al.
patent: 08-314253 (1996-11-01), None

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