Patent ID: 7483665

Claim:
A fixing device comprising a fixing roller, and two support rollers arranged maintaining a distance in a tangential direction of the fixing roller and wrapped with an endless belt, the support rollers being press-contacted to the fixing roller via said belt, said fixing device further comprising: support members arranged at both ends of the shafts of the support rollers and having circular outer circumferential surfaces; pressing members arranged between the support members at both ends thereof and each having a pair of tilted pressing surfaces that come in contact with said outer circumferential surfaces; and pressing means arranged for the pressing members and releasably presses the pressing members toward the axis of the fixing roller; wherein when pressed by the corresponding pressing means, the pressing members press the support rollers toward the axis of the fixing roller via the pairs of tilted pressing surfaces and via the outer circumferential surfaces of the support members so that part of the region of said belt in the circumferential direction is press-contacted to part of the region on the outer circumferential surface of the fixing roller and, further, press the support rollers in a direction in which they separate away from each other to impart a tension to said belt.