A printer includes a main body, 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, a mounting portion including a toner inlet portion connected to the toner container, where a toner cartridge usable to refill toner in the toner container is mountable to the mounting portion, an inlet shutter rotatably provided in the mounting portion to be rotatable together with the toner cartridge, the inlet shutter rotatable between a blocking position to block the toner inlet portion from receiving toner and an inlet position to open the toner inlet portion to receive toner, a locking unit to selectively lock and unlock the inlet shutter, and a controller to control the locking unit to selectively lock and unlock the inlet shutter based on whether the toner cartridge is mounted to the mounting portion.

A toner refilling interface structure including a toner cartridge, an installation portion, a first toner inlet portion, an inlet shutter, and a locking member. The toner cartridge including a discharge shutter located in or coupled to a body and to switch to a closed position at which a first toner discharge portion of the body is closed and to switch to a discharge position at which the first toner discharge portion is open. The toner cartridge is rotatable about a first rotation axis. The first toner inlet portion is provided in the installation portion to receive toner from the toner cartridge. The inlet shutter is provided in the installation portion to switch to an inflow position at which the first toner inlet portion is open, from a blocked position at which the first toner inlet portion is blocked, by a first rotation of the toner cartridge from an installation position to a first angular position The locking member is provided in the toner cartridge and to lock the discharge shutter at the closed position during the first rotation of the toner cartridge.

According to one embodiment, in an image forming apparatus, a frame that supports a transfer belt conveying a toner image in a conveyance direction and image forming units aligned along the transfer belt is provided with a dowel hole between the image forming units in a direction parallel to the conveyance direction and is also provided with an elongated hole having a long axis in a direction parallel to the conveyance direction, a dowel between the exposure units of a chassis supporting exposure units in a direction parallel to the conveyance direction is fitted to the dowel hole, and another dowel is inserted into the elongated hole.

A photosensitive member unit includes a photosensitive member, a rotary member, a charging roller, a separating member, and a one-way clutch. The charging roller is moved to and positioned at a separated position in a case where the photosensitive member rotates in a second direction when the separating member is positioned at a first position. The charging roller is moved to and positioned at a contact position in a case where the photosensitive member rotates in a first direction when the separating member is positioned at a second position.

When a sheet jam is detected, a processor may perform the following process. In a case where a sheet is spanning a first conveyance path and a drawer unit, the processor maintains a lock unit in a locked state by supplying power to the lock unit via the drawer unit from a power supply without depending on whether a door is in an open state or a closed state. In a case where a sheet is not spanning the first conveyance path and the drawer unit, the processor controls supplying and disconnecting of power to the drawer unit from the power supply in accordance with whether the door is in a closed state or an open state.

According to one embodiment, there is provided an exposure device including a print head that exposes photoreceptor to form a latent image on the photoreceptor, a lifting mechanism that lifts or lowers the print head relative to the photoreceptor, and a biasing member that biases the print head toward the photoreceptor. The lifting mechanism has a lifting holder that holds the print head and is liftable with respect to the photoreceptor. The biasing member is provided between the print head and the lifting holder.

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.

An image forming apparatus includes: a drawer movable in a first direction from an inside position to an outside position via an intermediate position; a stopper movable between a first position at which the stopper stops the drawer from moving from the intermediate position to the outside position, and a second position at which the stopper allows the drawer to move from the intermediate position to the outside position; a drum cartridge including a photoconductive drum and mountable on the drawer; and a developing cartridge including a developing roller and mountable on the drawer. The developing cartridge mounted on the drawer is removable from the drawer in a state in which the drawer is located at the intermediate position. The drum cartridge mounted on the drawer is removable from the drawer in a state in which the drawer is located at the outside position.

An image forming apparatus includes a photosensitive drum, an LED unit, and a housing. The LED unit is configured to expose the photosensitive drum. The LED unit has a light emitting surface. The housing includes a discharge portion and a discharge tray. The discharge portion has a discharge opening configured to discharge a sheet. The sheet discharged from the discharge opening is placed on the discharge tray. The discharge tray has a cleaning opening for cleaning the light emitting surface of the LED unit. The LED unit is configured to move between: a first position at which the LED unit exposes the photosensitive drum; and a second position at which the light emitting surface is closer to the cleaning opening than a state where the LED unit is located at the first position.

A snap ring is set to a set portion of a shaft of a rotator from a direction orthogonal to an axial direction of the shaft. The snap ring includes a first arcuate portion and a second arcuate portion facing each other, being elastically deformable in directions away from each other, holding the set portion by elastic deformation restoring force. One ends of the first and second arcuate portions are away from each other to form an insertion portion to insert the set portion. When the snap ring is not used, the first arcuate portion has a same radius of curvature as the second arcuate portion and the set portion, and a center of curvature closer to the second arcuate portion than the first arcuate portion, and the second arcuate portion has a center of curvature closer to the first arcuate portion than the second arcuate portion.