Patent ID: 7251428

Claim:
An image forming apparatus comprising: image forming means for forming an image on a recording material; a heating rotatable member for heating an image on the recording material; magnetic flux generating means for generating a magnetic flux for induction heat generation in said heating rotatable member; control means for controlling a temperature of said heating rotatable member; a temperature detecting member for detecting a temperature of said heating rotatable member at a predetermined region; magnetic flux confining means for confining the magnetic flux directed toward the predetermined region of said heating rotatable member from said magnetic flux generating means in accordance with an output of said temperature detecting means; moving means for movement said magnetic flux confining means between a magnetic flux confinement position and a non magnetic flux confinement position; interrupting means for interrupting a currently executing image formation job, when a detected temperature of said heating rotatable member is lower than a predetermined temperature; and reset control means for effecting, during a job of interrupting the currently executing image formation, an operation of moving said magnetic flux confining means toward the non magnetic flux confinement position and an operation of recovering a temperature of said heating rotatable member.