A fixing device according to an embodiment includes a first rotating body, a pressing unit, and an urging member. The pressing unit includes a belt, a second rotating body, a belt supporting member, and a pushing member. The pushing member includes a pressing region for pressing the belt toward the first rotating body. The pushing member is disposed between the second rotating body and the belt supporting member. The pressing unit is capable of switching a pressing position and a release position. When viewed from the axial direction of the first rotating body, a line connecting the center of the first rotating body and the center of the turning fulcrum passes the pressing region of the pushing member in both of the pressing position and the release position.

An image heating apparatus includes an endless belt for heating a toner image on a sheet, a first detector for detecting a temperature of one longitudinal end portion of the endless belt, a second detector for detecting a temperature of the other longitudinal end portion of the endless belt, and a controller for controlling whether notification of generation of an error is provided on the basis of a change amount per unit time of a difference between the temperature detected by the first detector and the temperature detected by the second detector.

An image forming apparatus includes a fixing unit including a fixing belt, a pressurizing rotator that forms a nip portion between the fixing belt and the pressurizing rotator by pressurizing an outer peripheral surface of the fixing belt, a first heating rotator that is provided so as to contact an inner peripheral surface of the fixing belt in the nip portion and heats the fixing belt, and a second heating unit that heats the fixing belt separately from the first heating rotator, wherein a toner to be used has physical properties described in the specification and includes an amorphous resin, a crystalline resin, and paraffin wax having a melting temperature of 60 C. to 80 C., and an absolute value of a difference in a melting temperature between the crystalline resin and the paraffin wax is 10 C. or less.

A fixing device includes a fixing belt that is rotatable and a pressure rotator that is pressed against the fixing belt to form a fixing nip therebetween. A polishing roller separably contacts the fixing belt and slides over an outer circumferential surface of the fixing belt while the polishing roller is pressed against the fixing belt. At least one support supports and stretches the fixing belt. A polishing aid, which is disposed opposite the polishing roller via the fixing belt, supports and stretches the fixing belt. The polishing roller is disposed opposite the polishing aid via the fixing belt to form a polishing nip between the polishing roller and the fixing belt while the polishing roller is pressed against the fixing belt. The polishing roller changes a rotation locus of the fixing belt along at least a part of a circumferential face of the polishing roller.

A fixing device according to an embodiment includes a first rotating body, a pressing unit, and an urging member. The pressing unit includes a belt, a second rotating body, a belt supporting member, and a pushing member. The pushing member includes a pressing region for pressing the belt toward the first rotating body. The pushing member is disposed between the second rotating body and the belt supporting member. The pressing unit is capable of switching a pressing position and a release position. When viewed from the axial direction of the first rotating body, a line connecting the center of the first rotating body and the center of the turning fulcrum passes the pressing region of the pushing member in both of the pressing position and the release position.

An image forming apparatus includes a fixing unit including a fixing belt, a pressurizing rotator that forms a nip portion between the fixing belt and the pressurizing rotator by pressurizing an outer peripheral surface of the fixing belt, a first heating rotator that is provided so as to contact an inner peripheral surface of the fixing belt in the nip portion and heats the fixing belt, and a second heating unit that heats the fixing belt separately from the first heating rotator, wherein a toner to be used has physical properties described in the specification and includes an amorphous resin, a crystalline resin, and paraffin wax having a melting temperature of 60 C. to 80 C., and an absolute value of a difference in a melting temperature between the crystalline resin and the paraffin wax is 10 C. or less.

A fixing device according to an embodiment includes a first rotating body, a pressing unit, and an urging member. The pressing unit includes a belt, a second rotating body, a belt supporting member, and a pushing member. The pushing member includes a pressing region for pressing the belt toward the first rotating body. The pushing member is disposed between the second rotating body and the belt supporting member. The pressing unit is capable of switching a pressing position and a release position. When viewed from the axial direction of the first rotating body, a line connecting the center of the first rotating body and the center of the turning fulcrum passes the pressing region of the pushing member in both of the pressing position and the release position.

A fixing device according to an embodiment includes a first rotator, a belt, and a second rotator. The belt forms a nip by abutting onto a surface of the first rotator. The second rotator is disposed to abut onto an inner circumferential surface of the belt. The second rotator presses the belt against the first rotator such that the dynamic frictional force between the inner circumferential surface of the belt and the second rotator becomes equal to or smaller than 0.98 N.

An image forming apparatus includes a fixing device configured to fix a toner to a recording medium, a cooling device disposed so as to cool the fixing device with forced air, and a rotatable guide configured to guide the recording medium towards a first location when in a first position and towards a second location when in a second position. The rotatable guide partially blocks the forced air at the first position and forms a pathway for the forced air when at the second position. A control unit rotates the guide unit to the second position if an operating mode of the fixing device is changed from a first mode having a fixing temperature set point at a first temperature to a second mode having a fixing set point temperature lower than the first temperature.

A fixing device according to an embodiment includes a first rotator, a belt, and a second rotator. The belt forms a nip by abutting onto a surface of the first rotator. The second rotator is disposed to abut onto an inner circumferential surface of the belt. The second rotator presses the belt against the first rotator such that the dynamic frictional force between the inner circumferential surface of the belt and the second rotator becomes equal to or smaller than 0.98 N.