| 主权项 |
1. A fixing device comprising:
an endless fusing belt configured to circularly move in a moving direction, the endless fusing belt having widthwise ends in a widthwise direction and an inner peripheral surface; a heater; a nip member extending through an internal space of the endless fusing belt; and a backup member configured to nip the endless fusing belt in cooperation with the nip member, the nip member comprising:
an outer surface facing the inner peripheral surface of the endless fusing belt; andprotruding portions respectively provided at positions outside the widthwise ends of the endless fusing belt in the widthwise direction and protruding toward the backup member relative to the outer surface of the nip member,wherein the outer surface of the nip member includes:
a contact surface in contact with the inner peripheral surface of the endless fusing belt through a lubricant anda non-contact surface out of contact with the inner peripheral surface of the endless fusing belt, the non-contact surface being positioned upstream relative to the contact surface in the moving direction, the non-contact surface being provided at a position inside the widthwise ends of the endless fusing belt in the widthwise direction, andwherein the protruding portions extends in the moving direction, a most upstream end of the protruding portions being positioned upstream relative to a most downstream end of the non-contact surface in the moving direction, and a most downstream end of the protruding portions being positioned downstream relative to a most upstream end of the contact surface in the moving direction. |
