To develop a conventional coupling for transmitting a driving force.

A coupling member is provided with a supporting portion for movable supporting a driving force receiving portion for receiving a driving force.

An image forming apparatus includes a drum unit, a process frame, a lock member and an intermediate transferring unit. The drum unit rotatably supports a rotating shaft of a photosensitive drum. The process frame has an attachment part to which the drum unit is attached. The lock member positions the drum unit to the attachment part. The intermediate transferring unit is attached to the process frame after the drum unit is attached. The lock member has a supporting part, an engagement part and a restriction part. Though the supporting part, an end of the rotating shaft is passed. The engagement part is engaged with the process frame between the process frame and the intermediate transferring unit. The restriction part interferes with the intermediate transferring unit between the engagement part and the intermediate transferring unit to prevent the engagement part from being detached from the process frame.

A cover covering an image bearing member such that the image bearing member is kept unexposed includes a holding portion holding an end portion of a sealing sheet sealing an opening portion such that an initial developer is accommodated in an accommodating chamber. Due to release of the seal of the opening portion with the sealing sheet, the initial developer accommodated in the accommodating chamber moves from the accommodating chamber to a second chamber through the opening portion, and the seal of the opening portion with the sealing sheet is released due to movement of a casing with respect to the cover and detachment of the cover from the casing, responsive to an operation of movement of a cartridge in an attachment direction, with the holding portion holding the end portion of the sealing sheet and a regulation portion regulating movement of the cover.

A drum unit includes: a frame; a first photosensitive drum; a second photosensitive drum; a charger; and a storage medium. The frame includes: a first frame plate; a second frame plate spaced apart from the first frame plate in a first direction; a third frame plate connecting one end of the first frame plate to one end of the second frame plate; and a fourth frame plate connecting another end of the first frame plate to another end of the second frame plate. The first photosensitive drum and the second photosensitive drum are rotatably supported by the frame. The second photosensitive drum is spaced apart from the first photosensitive drum and positioned closer to the third frame plate than the first photosensitive drum to the third frame plate in a second direction. The storage medium has an electrical contact surface positioned at an outer surface of the third frame plate.

An image forming apparatus, includes a body housing, a drawer movable between an accommodated position and a drawn position, a drum cartridge including a photoconductor drum, a developing cartridge including a developing roller, and a belt located above the photoconductor drum, and the drawer is located at the accommodated position. The drum cartridge includes a moving member movable, with respect to the photoconductor drum, between (i) a first position which is a position at which the moving member is not opposed to the developing cartridge mounted on the drum cartridge and is opposed to a circumferential surface of the photoconductor drum and (ii) a second position which is a position at which the moving member is not opposed to the circumferential surface of the photoconductor drum and is opposed to the developing cartridge mounted on the drum cartridge.

An image forming apparatus includes a first pressing member configured to press a unit that has a second rotating member that can come into contact with a first rotating member, and a supporting member rotatably supporting the second rotating member. The first pressing member moves the supporting member so that the second rotating member moves from the contact position to the separated position. Also provided is a second pressing member that presses the supporting member. The second pressing member is capable of moving between a mounting/detaching restriction position where mounting/detaching of the cartridge to/from the apparatus main body is restricted, and a mounting/detaching allowing position where mounting/detaching of the cartridge to/from the apparatus main body is allowed. The second pressing member moves the unit to a position distanced from the first rotating member by moving from the mounting/detaching restriction position to the mounting/detaching allowing position while pressing the supporting member.

A unit attachment-detachment mechanism includes a unit and a pair of guide rails. The pair of guide rails slidably supports a pair of side faces of the unit. The side faces respectively have formed thereon engagement projections that engage with the guide rails. The pair of guide rails has formed therein at least a pair of inclined portions. The pair of inclined portions is formed asymmetrically with each other in the unit width direction perpendicular to the attachment-detachment direction.

An intermediate transfer unit is attached to a position in the main body portion from a front side of the main body portion along the depth direction in a detachable manner. A cover portion extends in the depth direction and along a region of the outer circumferential surface of a rotating image carrying member that is more on a downstream side in a rotation direction of the image carrying member than the top region of the rotating image carrying member that is in contact with the intermediate transfer belt. A shield portion is provided on a portion of an upper surface of the cover portion that is closer to a front surface of the main body portion than the intermediate transfer belt. The shield portion has a taper surface that is inclined diagonally downward from a top surface of the shield portion toward the intermediate transfer belt.

An image forming device, including: a housing; a drawer movable between an inside position at which the drawer is located inside the housing and an outside position at which the drawer is located outside the housing; a drum cartridge including a photoconductive drum and a developer roller and mountable on the drawer; a toner cartridge storing toner to be supplied to the developer roller and mountable on the drawer, wherein the drawer includes a first guide that guides the toner cartridge in mounting the toner cartridge on the drawer, and wherein the drum cartridge includes a second guide connected to the first guide in a state in which the drum cartridge is mounted on the drawer, the second guide being configured to guide the toner cartridge in mounting the toner cartridge on the drawer in the state in which the drum cartridge is mounted on the drawer.

An image forming device, including: a housing; a drawer movable between an inside position at which the drawer is located inside the housing and an outside position at which the drawer is located outside the housing; a drum cartridge including a photoconductive drum and a developer roller and mountable on the drawer; a toner cartridge storing toner to be supplied to the developer roller and mountable on the drawer, wherein the drawer includes a first guide that guides the toner cartridge in mounting the toner cartridge on the drawer, and wherein the drum cartridge includes a second guide connected to the first guide in a state in which the drum cartridge is mounted on the drawer, the second guide being configured to guide the toner cartridge in mounting the toner cartridge on the drawer in the state in which the drum cartridge is mounted on the drawer.