Fixing device, image forming apparatus, and heating control...

Details Fixing device, image forming apparatus, and heating control... Fixing device, image forming apparatus, and heating control...

2008-05-08

2011-10-11

Gray, David (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

Reexamination Certificate

active

08036557

ABSTRACT:
A fixing device includes a heat roller having a degaussing alloy material, an induction heating member for exciting the heat roller, an inverter circuit for giving power at a predetermined frequency to the induction heating member, and a control unit, and when driving at a first drive frequency and fixing small size sheets by continuous passing, a local temperature rise occurs at an end part of the heat roller, and the end part approaches the Curie temperature, and when impedance of the inverter circuit reduces and an excessive current flows in the circuit, the fixing device drives at a higher second drive frequency, thereby increases a resistance of the heat roller by an epidermal effect of magnetic flux, increases an apparent resistance of the inverter circuit, makes it possible to use a flowing current within a normal range, heating a central part of the heat roller, and continues the fixing.

REFERENCES:
patent: 2005/0063726 (2005-03-01), Kinouchi et al.
patent: 2006/0131301 (2006-06-01), Ohta et al.
patent: 2006/0216079 (2006-09-01), Nanjo
patent: 11-327331 (1999-11-01), None
patent: 2000-250338 (2000-09-01), None
patent: 2001-125407 (2001-05-01), None
patent: 2004-151470 (2004-05-01), None

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