Patent ID: 8774666
Filing Date: 2014-07-08
Classification: G03G

Abstract:
1. A fixing device for conveying at least relatively small and large size sheets, the fixing device comprising: a hollow endless rotary body; a pressing member to contact an outer circumferential surface of the endless rotary body; a nip forming member placed on an inner circumferential side of the endless rotary body to contact the pressing member via the endless rotary body and form a nip thereon; a heating device placed on the inner circumferential side of the endless rotary body to heat the endless rotary body with radiant heat, the heating device including at least a first heat source to heat a region on the endless rotary body corresponding to a width of the small size sheet and a second heat source to heat regions on the endless rotary body corresponding to both widthwise ends of the large size sheet outside the width of the small size sheet; a power source to supply power to the heating device; and a temperature controller to control the power source, the temperature controller causing the power source to supply power only to the first heat source when the small size sheet is printed, and to both the first and second heat sources when the large size sheet is printed, the temperature controller causing the power source to supply more power to the first heat source when the small size sheet is printed than when the large size sheet is printed within the maximum power available to the fixing device.