An image forming apparatus includes: a photosensitive drum; a developing roller; a separation mechanism for moving the developing roller between a contacting position contacting the photosensitive drum and a separated position separated from the photosensitive drum; a first tray; a first sheet feed mechanism for feeding a sheet from the first tray toward the photosensitive drum; a first sheet sensor for detecting passage of the sheet at a prescribed position; and a controller. The controller of the image forming apparatus is configured to perform: when a printing operation is performed onto the sheet ted from the first tray, feeding the sheet in the first tray to the prescribed position and maintain the sheet; moving, on or after the first sheet sensor detects the sheet, the developing roller to the contacting position.

A first replaceable unit is provided for use with a second replaceable unit in an electrophotographic image forming device. The first replaceable unit includes a latch movable between a latching position for latching the first replaceable unit to the second replaceable unit and an unlatching position for permitting the first replaceable unit to separate from the second replaceable unit. The latch is positioned to contact a latch catch on the second replaceable unit in order to prevent the first replaceable unit from separating from the second replaceable unit when the first replaceable unit is mated with the second replaceable unit and the latch is in the latching position. The latch includes a cam follower surface for contacting a camming surface on the second replaceable unit during mating of the first replaceable unit with the second replaceable unit to cause the latch to move toward the latching or unlatching position.

In a configuration in which a metal holder is supported by a resin member, the metal holder cannot be grounded, so that electricity may be discharged from the charged holder to a substrate held by the holder. The holder is provided with a pin to determine a position of the holder with respect to a photosensitive member. A conductive member that is made of metal and is grounded, is brought into contact with the pin to thereby enable the holder to be grounded through the pin.

A toner cartridge includes a housing having a first combining portion and a front cover attached to a front end of the housing in a longitudinal direction, wherein the front cover includes a first locking portion to which the first combining portion is to be attached and a notch portion provided in the first locking portion so that the first locking portion is breakable by an external force in a direction in which the front cover is spaced apart from the housing in the longitudinal direction.

A toner cartridge includes: a housing to accommodate toner and including a fastening boss at a front end; a front cover including a fastening hole aligned with the fastening boss; a fastening member including a fastening portion and a head portion, the fastening portion configured to pass through the fastening hole and be fastened to the fastening boss to couple the front cover to the housing; and a separating portion to allow the fastening hole to be separated from the head portion of the fastening member by an external force acting on the front cover.

A photosensitive member unit includes a photosensitive member, a charging roller, a charging roller bearing member, a gear, a separation member having an engagement portion, a guide portion, and a frame to support the photosensitive member. The guide portion guides the charging roller bearing member urged by a urging member to separate the charging roller from the photosensitive member in a state where the engagement portion and the gear are engaged with each other and guides the charging roller bearing member urged by the urging member so that the charging roller comes into contact with the photosensitive member in a state where the engagement portion and the gear are not engaged. A distance between the urged charging roller bearing member and the frame is less than a length in which the engagement portion and the gear are engaged in the state where the engagement portion and the gear are engaged.

In an image-forming apparatus, a fixing device includes first and second fixing members; and a pressure modifying mechanism. The first and second fixing members form a nip. The pressure modifying mechanism modifies a nip pressure at the nip to one of a first nip pressure and a second nip pressure smaller than the first nip pressure. A controller performs: a converting process to convert print data into raster image data; an image-forming process to form a developer image on a sheet using the raster image data; and a fixing process to fix the developer image to the sheet with the fixing device at the first nip pressure. When a second converting process is not completed before a prescribed time following completion of a first fixing process has elapsed, the controller further performs a nip pressure reducing process to modify the nip pressure from the first to the second nip pressure.

A fixing device includes: a non-contact heating unit configured to heat a recording medium being transported on a transport path in a non-contact manner; a facing member that is disposed along the transport path at a position facing the non-contact heating unit and that is configured to move with respect to the recording medium; and a tension unit configured to tension a facing member in a direction along the transport path.

An image forming apparatus includes a fixing device, a power supply, a toner container, a cover, a first harness, and a second harness. The power supply supplies power to the fixing device. The toner container compartment is between the fixing device and the power supply and receives a toner container. The cover is on the toner container compartment and moves into the toner container compartment. The first harness is coupled to the power supply, and the second harness is coupled to the fixing device. The second harness is detachably coupled to the first harness above the cover.

An image forming apparatus includes a photosensitive drum, a developing roller, a cam, a developing motor, a first transmission mechanism, and a second transmission mechanism. The cam moves the developing roller between a contacting position where the developing roller is in contact with the photosensitive drum and a separated position where the developing roller is separated from the photosensitive drum. The developing motor drives both the developing roller and the cam, and is rotatable in a normal rotating direction and a reverse rotating direction. The first transmission mechanism engages power transmission from the developing motor to the developing roller when the developing motor rotates in the normal rotating direction, and disengages the power transmission when the developing motor rotates in the reverse rotating direction. The second transmission mechanism can engage power transmission from the developing motor to the cam, irrespective of the rotating direction of the developing motor.