An image formation apparatus according to an embodiment may include: an apparatus housing including a stacker formed on a periphery of the apparatus housing, wherein the stacker includes an opening; an image formation part provided in the apparatus housing and configured to form an image on a medium; and a fixation unit detachably attached in the apparatus housing and configured to fix the image formed by the image formation part on the medium, wherein in a state where the fixation unit is attached in the apparatus housing, a part of the fixation unit is exposed through the opening of the stacker to constitute a part of the stacker such that the opening of the stacker allows the fixation unit to be taken out from the apparatus housing therethrough.

An image formation apparatus according to an embodiment may include: an apparatus housing including a stacker formed on a periphery of the apparatus housing, wherein the stacker includes an opening; an image formation part provided in the apparatus housing and configured to form an image on a medium; and a fixation unit detachably attached in the apparatus housing and configured to fix the image formed by the image formation part on the medium, wherein in a state where the fixation unit is attached in the apparatus housing, a part of the fixation unit is exposed through the opening of the stacker to constitute a part of the stacker such that the opening of the stacker allows the fixation unit to be taken out from the apparatus housing therethrough.

An image heating apparatus includes a first rotatable member and a second rotatable member, which are configured to form a nip in which a toner image is fixed on a recording material, an air blowing mechanism, and a duct configured to guide air from the air blowing mechanism toward an end portion of the first rotatable member with respect to a longitudinal direction of the first rotatable member. The image heating apparatus also includes an opening and closing mechanism configured to open and to close an air blowing port of the duct. The opening and closing mechanism includes a plurality of shutter members configured to close the air blowing port in cooperation with each other.

A heating device includes a heating roller that includes a resistance heating layer, a bearing that supports the heating roller to allow the heating roller to be rotatable, and a connection power feeder that is mounted on an end portion of the heating roller, is connected to the resistance heating layer, and feeds power to the resistance heating layer, in which the connection power feeder includes an annular frame that is disposed to be concentric with the heating roller and is conductively connected to the resistance heating layer, a power feed shaft of which a portion is disposed in the frame and which feeds power, and plural rolling bodies that roll while being in conductive contact with an inner peripheral surface of the frame and an outer peripheral surface of the power feed shaft, and the bearing is mounted on a portion of the end portion of the heating roller that is closer to an inside than the connection power feeder in an axial direction.

A fixing device is configured to fix a toner image to a sheet by heat and includes: a heating rotator; a pressurizing roller contacting with the heating rotator; a heater configured to heat the heating rotator such that the heat is transferred to the sheet passing through a contact portion between the heating rotator and the pressurizing roller; a plurality of separation claws configured to separate the sheet from the heating rotator such that the sheet passing through the contact portion is not caught in the heating rotator, the separation claws being provided opposite to the heating rotator; and an adjustor configured to adjust positions of the separation claws relative to the heating rotator such that distances between the separation claws and the heating rotator are equal to each other.

An action member is movable between a first position at which a unit bias member is sandwiched between the action member and a heating unit and a second position. A movement mechanism operates in conjunction with a movement of an operation portion to cause the action member to move from one of the first position and the second position to another one of the first position and the second position. A contact portion of the heating unit comes into contact with a fixing unit by a bias force received from the unit bias member when the action member is at the first position. The action member includes an engagement portion which engages with a part of the heating unit when the action member moves from the first position to the second position. The heating unit engages with the engagement portion to move from a reference position to an evacuation position.

An image forming apparatus includes an apparatus main body that includes an image formation unit forming an image on a recording material, a fixation unit that includes a fixing unit fixing the image formed by the image formation unit onto the recording material and that is attachable to and detachable from the apparatus main body, a first duct that is attached to the fixation unit to face the fixing unit and through which a gas that cools the fixing unit flows, and a second duct that is attached to the apparatus main body to be adjacent to the first duct and through which a gas that cools the fixing unit flows.

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

An image forming apparatus is provided. Upon receiving a borderless printing instruction, the image forming apparatus performs cleaning processing according to a sheet size. The cleaning processing is different from cleaning processing to be performed when a border printing instruction is received.

An image forming apparatus includes a correcting portion, an image forming device, and a fixing device that is one of a first fixing device including a first pair of rotatable members forming a first nip under a first load, and a second fixing device including a second pair of rotatable members forming a second nip under a second load that is less than the first load. A mounting portion selectively mounts one of the plurality of fixing devices. A detector detects a density of a toner image fixed on a recording material. When the fixing device is the first fixing device, an executing portion permits execution of a calibration process for generating a correction condition on the basis of a result of detection of a predetermined toner image by the detector, and, when the fixing device is the second fixing device, the executing portion prohibits execution of the calibration process.