Device including rotator and belt, such as a fixing device for an image forming apparatus

A device comprising:

• a rotator having a rotation axis;
• a belt;
• a nip forming member surrounded by the belt and configured to, with the rotator, pinch the belt to form a nip;
• an urging member configured to urge one of the rotator and the nip forming member towards the other in a particular direction perpendicular to the rotation axis;
• an upstream guide including an upstream guide surface configured to guide an inner peripheral surface of the belt, wherein the upstream guide surface is positioned entirely upstream of the nip in a moving direction of the belt perpendicular to the particular direction and the rotation axis, and wherein the upstream guide is not configured to pinch the belt with the rotator and does not form the nip;
• and
• a downstream guide including a downstream guide surface configured to guide the inner peripheral surface of the belt, wherein the downstream guide surface is positioned entirely downstream of the nip in the moving direction, and wherein the downstream guide is not configured to pinch the belt with the rotator and does not form the nip,
• wherein the nip forming member includes a facing surface which faces the rotator, and
• wherein an upstream edge of the facing surface in the moving direction is located at a position farther from the rotation axis, in the particular direction, than a downstream edge of the upstream guide surface.