Image forming apparatus capable of preventing waste of...

Details Image forming apparatus capable of preventing waste of... Image forming apparatus capable of preventing waste of...

2008-02-07

2010-06-01

Porta, David P (Department: 2884)

Electrophotography

Machine operation

Job mode

C399S058000, C399S061000, C399S082000

Reexamination Certificate

active

07729631

ABSTRACT:
A mode setting portion sets a mode to either one of a normal mode in which a developer amount set value T is set to a base developer amount Tbase and a developer-saving mode in which the value T is set to a value smaller than the base developer amount Tbase based on a saving coefficient S. A parameter obtaining portion obtains both a cumulative number of printed sheets Pttl and a developer remaining amount Rt. A determining portion determines in the developer-saving mode whether a first inequality Rt≦Tbase×Sdef×(Pmax−Pttl) is satisfied. A saving-coefficient setting portion sets the saving coefficient S to a default saving coefficient Sdef if the determining portion determines that the first inequality is satisfied, and sets the saving coefficient S to a value satisfying a second inequality Sdef<S≦Rt/{Tbase×(Pmax−Pttl)} if the determining portion determines that the first inequality is not satisfied.

REFERENCES:
patent: 7218871 (2007-05-01), Ogata
patent: 7394998 (2008-07-01), Takagi
patent: 2003/0184638 (2003-10-01), Shimomura et al.
patent: 2006/0204257 (2006-09-01), Kawano et al.
patent: 168 099 (2002-01-01), None
patent: 6-12005 (1994-01-01), None
patent: 11-125999 (1999-05-01), None
patent: 2006-235237 (2006-09-01), None

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