An image-forming apparatus includes a photosensitive drum, a developing roller, a cam, a switching mechanism, a sheet tray, a sheet feed mechanism, a sheet sensor, and a controller. The switching mechanism rotates the cam to move the developing roller from a contact position in contact with the photosensitive drum to a separated position away from the photosensitive drum after development for the first sheet, if feeding of a second sheet is not started after elapse of a prescribed time period since detection of a first sheet. If image data for the second sheet is ready and upon elapse of a predetermined standby time period from elapse of the prescribed time period, the sheet feed mechanism starts feeding the second sheet toward the photosensitive drum and the switching mechanism rotates the cam to move the developing roller to the separated position in accordance with conveyance of the second sheet.

An image forming apparatus including an image forming unit, which is detachably mounted to the image forming apparatus. The image forming unit includes a storage unit configured to store a computer program for forming an image on the sheet; a detector configured to detect whether the image forming unit and the controller are connected to each other; a door to be opened to draw out the image forming unit from the image forming apparatus; and a locking unit configured to switch between a locked state and an unlocked state. The controller is configured to rewrite the computer program stored in the storage unit under a state in which the locking unit is in the locked state and the detector detects the connection between the image forming unit and the controller.

An image forming apparatus includes a housing, a top cover having an opening, a process cartridge attachable to the housing, a toner cartridge attachable to the process cartridge, and an interlocking mechanism. The top cover is pivotally movable between a first position closing the opening and a second position opening the opening. In a state where the toner cartridge is attached to the process cartridge, the toner cartridge is pivotally movable between an attachment/detachment position where the toner cartridge is attachable to and detachable from the process cartridge; and a fixed position where the toner cartridge is fixed to the process cartridge. The interlocking mechanism is configured to pivotally move the toner cartridge to the attachment/detachment position when the top cover is moved to the second position, and to pivotally move the toner cartridge to the fixed position when the top cover is moved to the first position.

A fixing device includes a pressure roller including a rotation shaft, a bearing that rotatably supports the rotation shaft, a first bracket mounted on a first end of the pressure roller in an axial direction thereof, and a second bracket mounted on a second end of the pressure roller in the axial direction thereof. Each of the first bracket and the second bracket includes a rotation shaft support face through which the rotation shaft of the pressure roller is inserted and a bearing support face disposed opposite an outer circumferential surface of the bearing. A first tab is mounted on the bearing support face of the first bracket. A second tab is mounted on the bearing support face of the second bracket. The first tab and the second tab are disposed upstream from the rotation shaft of the pressure roller in a recording medium conveyance direction.

According to one embodiment, the exposure device includes an exposure head, a holder, a biasing member, a lifting mechanism, a support member, a harness, and a protrusion. The holder supports the exposure head movably in a first direction of approaching the photosensitive drum and a second direction of being spaced from the photosensitive drum. The harness has one end portion connected to the exposure head. The harness is positioned with respect to the support member in a positioning location having a length direction position different from that of the one end portion. The harness has a folding portion formed between the one end portion and the positioning location. The protrusion enters inside of the folding portion to regulate movement of the folding portion of the harness in the first direction or the second direction. The protrusion protrudes from the holder in a third direction intersecting the first direction.

An image forming apparatus includes: a first developing roller movable between a first contact position and a first separated position; a second developing roller movable between a second contact position and a second separated position; and a controller. When a sheet interval is shorter than a first interval and is longer than or equal to a second interval, the controller maintains the first developing roller at the first contact position even after the completion of its development for a preceding sheet, controls the first developing roller to start development for a subsequent sheet, moves the second developing roller to the second separated position after the completion of its development for the preceding sheet, moves the second developing roller again to the second contact position, and controls the second developing roller to start development for the subsequent sheet after the second developing roller is moved again to the second contact position.

An image-forming device includes a main casing, a belt accommodated in the main casing, developing units arranged along the belt, a drawer configured to detachably support the developing units, the drawer configured to move to a position inside the main casing and to a position outside the main casing, and the drawer having a leading end and a trailing end in a pulling direction from the inside position to the outside position; and a guide configured to guide the drawer and to move between a first position and a second position when the drawer is at the inside position, the second position being farther from the belt than the first position from the belt. When the guide is at the second position, the guide is configured to be tilted downward relative to a horizontal direction such that the leading end is lower than the trailing end.

A cartridge removably attachable to an image forming apparatus, including a resin-made casing, a planar memory chip configured to store information to be outputted to the image forming apparatus, a recess portion provided on an outer surface of the casing to fit the memory chip, and a regulating portion formed integrally with the casing and provided to project out of the outer surface of the casing in a direction intersecting with a surface of the memory chip to regulate a move of the memory chip in the direction intersecting with the surface of the memory chip, wherein the memory chip is attached to the recess portion in a condition of displaceable within the recess portion in a posture substantially surrounded by side wall of the recess portion.

A printer includes a main body including a communicating portion, a development cartridge attachable to and detachable from the main body, the development cartridge to supply toner contained in a toner container to an electrostatic latent image formed on a photoconductor, to form a visible toner image, and a toner refilling portion connected to the toner container. The toner refilling portion includes a mounting portion into which a toner cartridge insertable from outside the main body through the communicating portion to be mountable, a toner inlet portion provided in the mounting portion to receive toner from the toner cartridge when the toner cartridge is mounted to the mounting portion, and an inlet shutter switchable between a blocking position where the toner inlet portion is blocked from receiving toner, and an inlet position where the toner inlet portion is open to receive toner. The printer includes a first latch member switchable between a first position where the inlet shutter is locked from switching between the blocking position and the inlet position and a second position where switching of the inlet shutter is allowed to switch between the blocking position and the inlet position, and a switching unit to switch between the first latch member between the first position and the second position.

An image forming apparatus including a main body casing, a drum cartridge and a developing cartridge. The main body casing has an opening and a slot extending in from the opening toward an inside of the main body casing along a first direction. The drum cartridge and the developing cartridge are arranged in a second direction intersecting the first direction in a state where the drum cartridge and the developing cartridge are attached to the slot. The main body casing includes a drum guide groove configured to guide movement of the drum cartridge. The drum cartridge includes a drum protrusion configured to be engaged with the drum guide groove. A width of the drum guide groove in the second direction is decreased toward the inside of the main body casing from the opening.