Patent ID: 8295726

Claim:
A fixing device comprising: a fixing member which rotates; a pressure member which is pressed against the fixing member; an external heat unit including an external heat member which rotatably abuts against a surface of the fixing member so as to heat the fixing member; heating means for heating the external heat member; a cleaning member which abuts against a surface of the external heat member on which the fixing member is abutted, the cleaning member being abutted on a position moved from a position where the fixing member is abutted to a position where the fixing member is not abutted, the position being moved due to rotation of the external heat member, so as to remove work-ups being adhered to the surface of the external heat member, wherein: the cleaning member is a fixed member fixed to a housing of the external heat unit, so that a part of the cleaning member abutting against the external heat member does not relatively move with respect to the housing, a recording medium is fed in between the fixing member and the pressure member, and onto the recording medium, the fixing member thermally fixes a toner image on the recording medium, the fixing device comprising: a control section for controlling a surface temperature of the fixing member, the controlling section performing a cooling process in a case where the fixing process is to be performed for a recording medium having a larger width than or a width equal to a predetermined width after the fixing process was continuously performed for more than a predetermined number of recording media each having a smaller width than the predetermined width, the cooling process reducing a surface temperature of the fixing member before the fixing process is performed for the recording medium having the larger width than or the width equal to the predetermined width, so that the surface temperature of the fixing member in a region where the recording media each having the smaller width than the predetermined width do not abut is reduced to a temperature equal to or lower than a highest temperature at which a high-temperature offset does not occur during the fixing process for the recording medium having the predetermined width even in a case where a material scraped off from the external heat member by the cleaning member is adhered to the region where the recording media each having the smaller width than the predetermined width do not abut.