Image forming apparatus

Electrophotography – Control of electrophotography process – Control of fixing

Reexamination Certificate

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Details

C399S068000, C399S069000, C399S043000

Reexamination Certificate

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07120370

ABSTRACT:
In a duplex printing or a simplex printing, upper and lower rollers of a fixing unit are separated from each other or stop rotating during a period after the fixing operation of the first side of a recording medium (or a preceding recording medium) and before the fixing operation of the second side of the recording medium (or a subsequent recording medium). With such an arrangement, it is possible to prevent the excessive heating of the lower roller, and thereby to prevent the degradation of the printed image.

REFERENCES:
patent: 5493380 (1996-02-01), Saitou et al.
patent: 6782231 (2004-08-01), Fuma et al.
patent: 6904257 (2005-06-01), Tomatsu
patent: 10063132 (1998-03-01), None
patent: 2000-338817 (2000-12-01), None

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