Fixing device and image forming apparatus

摘要

A fixing device includes a pressurization member pressed against a fixing rotator and a magnetic flux generator disposed opposite the fixing rotator. A heat generator is disposed opposite the magnetic flux generator to generate heat by a magnetic flux generated by the magnetic flux generator. A magnetic shield is movably disposed inside the heat generator to screen the magnetic flux penetrating through the heat generator. A pressure adjuster presses the pressurization member against the fixing rotator with variable pressure. An interlock interlocks the pressurization member with the magnetic shield. The pressure adjuster presses the pressurization member against the fixing rotator with increased pressure to move the magnetic shield via the interlock to a proximate position in proximity to the heat generator and with decreased pressure to move the magnetic shield via the interlock to a remote position being remote from the heat generator.

主权项

1. A fixing device comprising:
a fixing rotator rotatable in a given direction of rotation to heat a toner image on a recording medium; a pressurization member pressed against the fixing rotator to form a fixing nip therebetween through which the recording medium is conveyed; a magnetic flux generator, disposed opposite the fixing rotator, to generate a magnetic flux; a heat generator made of a magnetic shunt alloy and disposed opposite the magnetic flux generator to generate heat by the magnetic flux generated by the magnetic flux generator and heat the fixing rotator; a magnetic shield movably disposed inside the heat generator to screen the magnetic flux penetrating through the heat generator; a pressure adjuster to press the pressurization member against the fixing rotator with variable pressure; and an interlock to interlock the pressurization member with the magnetic shield, the pressure adjuster to press the pressurization member against the fixing rotator with increased pressure to move the magnetic shield via the interlock to a proximate position in proximity to the heat generator and with decreased pressure to move the magnetic shield via the interlock to a remote position being remote from the heat generator.