| 主权项 |
1. A fixing device comprising:
a roller having an axis extending in a first direction, the roller configured to rotate about the axis and having end portions in the first direction; a heating assembly facing the roller in a second direction perpendicular to the first direction, the heating assembly being configured to provide a nip region in cooperation with the roller, the heating assembly including a guided portion having a first surface and a second surface positioned opposite to the first surface in a third direction perpendicular to the first direction and the second direction, the first surface being formed with a first groove recessed into the first surface toward the second surface, the second surface being formed with a second groove recessed into the second surface toward the first surface; a pressing assembly configured to urge the heating assembly toward the roller; and a frame configured to support the end portions of the roller and configured to movably support the heating assembly in the second direction, the frame having a first wall and a second wall facing the first wall in the third direction, the frame including:
a recessed portion defined by the first wall and the second wall and having an opening facing the heating assembly, the recessed portion being configured to support the end portions of the roller;a first guide portion configured to guide movement of the heating assembly and connected to the first wall, the first guide portion having a first protrusion and a first restriction wall, the first protrusion protruding toward the first groove and configured to fit into the first groove, the first protrusion having a surface facing in the first direction, the first restriction wall protruding from the surface facing in the first direction of the first protrusion and being positioned outside the first groove, the first restriction wall having a first restriction surface that is configured to face the first surface in the third direction to restrict the guided portion from moving in the third direction, the first restriction surface having a farthest end portion positioned farthest from the roller in the second direction, the farthest end portion of the first restriction surface facing the first surface in the third direction when the heating assembly is at its closest position to the roller; anda second guide portion configured to guide movement of the heating assembly and connected to the second wall, the guided portion being configured to be interposed between the first guide portion and the second guide portion in the third direction, the second guide portion being positioned opposite to the first guide portion in the third direction, the second guide portion having a second protrusion and a second restriction wall, the second protrusion protruding toward the second groove and configured to fit into the second groove, the second protrusion having a surface facing in the first direction, the second restriction wall protruding from the surface facing in the first direction of the second protrusion and being positioned outside the second groove, the second restriction wall having a second restriction surface that is configured to face the second surface in the third direction to restrict the guided portion from moving in the third direction, the second restriction surface having a farthest end portion positioned farthest from the roller in the second direction, the farthest end portion of the second restriction surface facing the second surface in the third direction when the heating assembly is at its closest position to the roller,wherein the first surface of the guided portion of the heating assembly has a first portion facing the farthest end portion of the first restriction surface, the first portion extending beyond the farthest end portion of the first restriction surface in a direction away from the roller when the heating assembly is at its closest position to the roller, andwherein the second surface of the guided portion of the heating assembly has a second portion facing the farthest end portion of the second restriction surface, the second portion extending beyond the farthest end portion of the second restriction surface in a direction away from the roller when the heating assembly is at its closest position to the roller. |
