Patent ID: 6876823

Claim:
An image-forming device which forms an image on a recording material at a heating drum heated to a predetermined temperature, the device comprising: a heating device which heats the heating drum; and a control device which controls the heating device by on/off control based on an on/off control signal and alters a period of the on/off control signal in accordance with control modes, the period of the on/off control signal expressing an amount of time required for one on/off cycle, and multiple on/off cycles being repeated in any one control mode, the control modes comprising (a) a printing mode for maintaining the heating drum at the predetermined temperature during image-formation, and (b) at least one ordinary mode which is used at times other than during image-formation, wherein, the period of the on/off control signal of the printing mode (T 1 ) is less than the period of the on/off control signal of the at least one ordinary mode (T 0 ).