There is provided a guide incorporated in a fixing device including a belt configured to circularly move in a moving direction. The guide includes: a guide portion elongated in a longitudinal direction orthogonal to the moving direction; a first gate mark; and a second gate mark arranged spaced apart from the first gate mark in the longitudinal direction. The guide portion includes a resin and a plurality of elongated-shaped fillers dispersed in the resin. The guide portion has a guide surface configured to guide movement of the belt in the moving direction, a peripheral surface of the belt being configured to contact the guide surface.

A fixing device includes: a first heater including a first glass tube, a first heating body, and a first lead portion; a second heater including a second glass tube, a second heating body, and a second lead portion; a frame including first and second fixing surfaces; and a first terminal member including a first connection portion and a first fixed portion; and a second terminal member including a second connection portion and a second fixed portion. The first and second heaters are elongated in an elongated direction and arrayed in a first array direction. The first and second lead portions are fixed to the first and second connection portions, respectively. The first and second fixed portions are fixed to the first and second fixing surfaces, respectively, and arrayed in a second array direction. The first array direction is inclined relative to the second array direction when viewed in the elongated direction.

A fixing device detachably attachable to an image forming apparatus includes a housing frame having an open front side in an insertion direction in which the fixing device is inserted into the image forming apparatus. The housing frame includes a support plate, as a back side of the housing frame in the insertion direction, and a pair of side plates extending in the insertion direction. The support plate includes an extension extending beyond one of the pair of side plates. The extension includes an engaged portion to be engaged with an engaging portion of the image forming apparatus when the fixing device is mounted on the image forming apparatus.

A heating device includes a first rotator and a second rotator that contacts the first rotator to form a nip between the first rotator and the second rotator. A heater heats at least one of the first rotator or the second rotator. A first support frame supports one lateral end of the first rotator and the second rotator in a longitudinal direction of the first rotator and the second rotator. A second support frame supports another lateral end of the first rotator and the second rotator in the longitudinal direction of the first rotator and the second rotator. An incompatible member is mounted on the first support frame.

An image forming apparatus includes a fixing unit and an apparatus main body. The fixing unit includes a first rotator, a second rotator, a temperature sensor, a switching mechanism, a switching sensor, and a unit side connector. The temperature sensor outputs a temperature signal corresponding to a temperature of the first rotator. The switching mechanism switches pressure of a fixing nip. The switching sensor outputs a switching signal corresponding to a position of the switching mechanism. The unit side connector is connected to the temperature sensor and the switching sensor. The apparatus main body includes a main body side connector and a controller. The main body side connector is connected to the unit side connector. The controller determines a state of attachment of the fixing unit to the apparatus main body on a basis of the temperature signal and the switching signal.

A fixing device includes a first unit including a first rotatable member; a second unit including a second rotatable member forming a nip, in cooperation with the first rotatable member, for fixing a toner image on a recording material; a frame supporting the second unit; a guiding member movable between a guiding position for guiding the recording material toward the nip and a retracted position where the guiding member is retracted from a space permitting demounting of the second unit from the frame; a cover member openable for exposing the space; and an interrelating mechanism configured to restore the guiding member, which is in the retracted position when the cover member is in an open position, to the guiding position in interrelation with movement of the cover member from the open position to a closed position.

An image forming apparatus includes a housing, an attachable and detachable device, a cover member, and a rotation angle restricting member. The housing has an opening and an attachment section. The attachable and detachable device is attachable to and detachable from an inside of the housing via the opening. The cover member is rotatably supported by the housing and closes or opens the opening. The rotation angle restricting member restricts an allowable rotation angle that indicates an angle at which the cover member is rotatable. The rotation angle restricting member is attachable to and detachable from the attachment section. The allowable rotation angle of the cover member is restricted when the rotation angle restricting member is attached to the attachment section. Restriction of the allowable rotation angle of the cover member is released when the rotation angle restricting member is detached from the attachment section.

A fixing apparatus for an image forming apparatus includes: a fixing belt; a pressure roller configured to face the fixing belt; a nip forming member configured to be disposed inside the fixing belt and press the fixing belt to the pressure roller to form a nip; and first and second guide bushings configured to be disposed at both ends of the nip forming member, respectively, in which the first and second guide bushings each support both end supports both ends of the fixing belt in a state in which a part thereof is movable.

Inside the body of an image forming device, first to fifth electric charge providers are mounted in a first location out of a path of an air flow to the suction unit caused by the action of the suction unit, and a sixth electric charge provider is mounted in a second location through which external air flows in the body caused by the action of the suction unit. Each electric charge provider emits charges in ambient air to cause ultrafine particles floating in the ambient air to clump together.

An image forming apparatus includes a correcting portion to correct gradation of inputted image data on the basis of a correction condition, an image forming device to form, on a recording material, a toner image corresponding to the corrected image data, a mounting portion, an executing portion to execute an output process for forming and outputting, on the recording material, a predetermined toner image for generating the correction condition, the predetermined toner image including a plurality of image regions different in density, an input portion to permit input of an execution instruction of the output process by an operator, and a controller to control notification of information to the operator. The controller provides notification prompting exchange of the fixing portions in certain cases.