In a case in which an image forming apparatus determines that a replaceable unit is replaced in a first state, in which removal of the replaceable unit is inhibited, the image forming apparatus performs control to switch from the first state to a second state, in which removal of the replaceable unit is allowed.

A system for an electrophotographic image forming device includes a basket for holding multiple toner cartridges. A guide rail assembly operatively connected to an access door moves between a raised position and a lowered position to raise and lower the basket when the access door moves between an open position and a closed position. The basket is slidable along the guide rail assembly into and out of the image forming device when the guide rail assembly is in the raised position, and is in an operational position within the image forming device when the guide rail assembly is in the lowered position. A rail lock mechanism locks the access door in the open position when the guide rail assembly is in the raised position and the basket is extended out of the image forming device and unlocks the access door from the open position when the basket is inserted.

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 process cartridge; and an apparatus main body to which the process cartridge is attachable and from which the process cartridge is detachable. The process cartridge includes: a photoconductive drum, and an electrode connected to the photoconductive drum and having a contact surface facing downward. The apparatus main body includes: a support frame supporting one end portion of the process cartridge in an axis direction of the photoconductive drum, a ground metal plate supported by the support frame and connected to ground, and a spring supported by the support frame and configured to contact with the contact surface of the electrode from below to connect the electrode and the ground metal plate.

An image forming unit insertable into an image forming apparatus includes a photosensitive drum and a drum case supporting the photosensitive drum. The drum case includes a guide configured to (i) at least partially engage with a solid head of the image forming apparatus when inserted into the image forming apparatus along a first direction and (ii) guide the solid head in a second direction orthogonal to the first direction when the solid head is selectively repositioned along the second direction toward the photosensitive drum.

A cartridge frame includes a protruding rib protruding toward a first frame, a first bearing supporting one end of a photosensitive drum in an axial direction, and a second bearing supporting an other end of the photosensitive drum in the axial direction. The first frame includes a first guide rail configured to, when a process cartridge is attached to an apparatus main body, guide the protruding rib to slide along the first guide rail. A second frame includes a second guide rail configured to, when the process cartridge is attached to the apparatus main body, guide the second bearing to slide along the second guide rail. A size of the first guide rail in a width direction perpendicular to both the axial direction and an attachment direction of the process cartridge is smaller than a size of the second guide rail in the width direction.

In some examples, an apparatus can include a mating interface coupled to a dispense interface to interact with a print particle dispense nozzle, a locking mechanism coupled to the dispense interface to prevent the print particle dispense nozzle from depositing a print particle to the dispense interface, and an authentication mechanism coupled to the locking mechanism to: authenticate the print particle dispense nozzle, and unlock the locking mechanism when the print particle dispense nozzle is authenticated to allow the print particle dispense nozzle to deposit the print particle to the dispense interface.

A first protrusion is provided between an operation lever and a lock lever. The operation lever is for moving a pressure roller. The lock lever is provided for a sheet guide member for guiding a sheet that has passed through a fixing unit downstream in the sheet conveyance direction. The lock lever is for locking the sheet guide member at a position where the sheet guide member is engaged with a housing. The first protrusion protrudes from the sheet guide member toward an exterior cover. The first protrusion is provided with a second protrusion on the lock lever side of the first protrusion.

An abutting portion that abuts on an operation lever for moving a pressure roller is provided on an inner side of an exterior cover provided so as to be openable and closable with respect to a housing that accommodates a fixing unit. The pressure roller is movable to a first pressing position where the pressure roller presses a heating roller with a first pressing force and to a second pressing position where the pressure roller presses the heating roller with a second pressing force smaller than the first pressing force. In addition, the operation lever is moved to a first position for positioning the pressure roller at the first pressing position and to a second position for positioning the pressure roller at the second pressing position. When the exterior cover is closed while the operation lever is located at the second position, the abutting portion abuts on the operation lever.

An example image forming apparatus includes a coupling device to perform coupling or decoupling between the image forming apparatus and a consumable, a sensor to sense an opening of a cover of the image forming apparatus, and a processor. When receiving an opening sensing signal of the cover from the sensor, the processor determines whether the consumable coupled to the image forming apparatus corresponds to a consumable access condition, and based on a result of determination, transmits a signal requesting decoupling of the consumable corresponding to the consumable access condition to the coupling device.