An image forming apparatus includes a developing device including a photosensitive unit having a photoreceptor and a developing unit having a developing. A light scanning unit including a light source may be included to generate light to form an electrostatic latent image on the photoreceptor through a window through which the light is transmitted, and shutter unit may be included to open and close the window. At least one pressing unit is provided to press the developing unit to cause the developing roller separated from the photoreceptor to contact the photoreceptor. The pressing unit may further cause the shutter unit to open and close the window. An operating unit is connected to the at least one pressing unit. The operating unit is movable between an operating position to generate a pressing force by the at least one pressing unit to press the developing unit to contact the photoreceptor and a standby position to release the pressing force.

A housing includes a body portion, including an opening, and a cover portion that covers the opening. The cover portion includes a first cover and a second cover that is perpendicular to the first cover. The first cover includes a cover body that is platy. A projection projects from the cover body. A first attachment is mounted on the projection and attaches the first cover to the body portion. A second attachment is disposed on the first attachment and attaches the second cover to the first cover.

An opening and closing mechanism includes an opening and closing door that is rotatably supported to be movable between a closed position where an opening of an apparatus body is covered and an opened position where the opening is opened, a link member provided in the apparatus body and rotatably supported by a rotary shaft, a guide member having a first guide surface that moves while being in contact with the link member in a case where the opening and closing door moves to the closed position and a second guide surface that moves while being in contact with the link member in a case where the opening and closing door moves to the opened position, and a switching member that guides the link member from the first guide surface to the second guide surface, in which the switching member includes a root portion and an arm extending from the root portion to an opposite side to the apparatus body, and a first rotational moment toward the first guide surface using the root portion as an axis is applied to the arm.

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 forming apparatus includes: an LED print head exposing a photosensitive drum with light; a door arranged on one end side of the LED print head; a support portion for the LED print head operating in conjunction with opening and closing movements of the door, positioning the LED print head at a first position for exposing the photosensitive drum when the door is closed, and positioning the LED print head at a second position more apart from the photosensitive drum than the first position when the door is open; and a guide portion formed on the door and guiding a cleaning member to the LED print head, the guide portion having a first inclined surface which is lowered toward the LED print head so that the cleaning member is continuously held in contact with the LED print head under a state in which the door is open.

An image forming apparatus may include a photosensitive member, a developing device including a developing roller, pressing members configured to engage with the developing device and springs configured to urge the pressing members. In some examples, each of the pressing members may be configured to contact and move the developing device between various positions based on the urging of the springs. Additionally or alternatively, various ends of a contact surface of the developing roller configured to contact developer may be disposed relative to an axis line of the developing roller and pressing surfaces of the pressing members.

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.

A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main-assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.

In an image forming apparatus, if a path for transferring heat generated by a drive integrated circuit to a frame (a heat dissipation plate) of an apparatus main body has a point that divides the path, foreign matter such as dirt and dust can be caught at the point, so that heat dissipation efficiency can decrease due to presence of such foreign matter. Therefore, a configuration is provided in which a drive integrated circuit and a frame (a heat dissipation plate) provided in a cover are connected by a heat transfer member, so that a heat transfer path from the drive integrated circuit to the frame has no point that divides the path.

An image forming apparatus includes an apparatus body including a main contact, and a main guide, and a cartridge including a memory contact, a moving unit moving into and out of the apparatus body in a first direction and including a frame to which the cartridge is attached, first and second protrusions protruding in a second direction orthogonal to the first direction from the end surface of the frame, an intermediate contact being in electrical contact with the memory contact, an unit contact being in electrical contact with the main contact, and a line conductor, the first protrusion being supported by the main guide of the apparatus body, the second protrusion being located above the first protrusion. At least part of the line conductor connecting the intermediate contact and the unit contact is located in a recess formed by the first protrusion, the second protrusion, and the end surface.