An image-forming apparatus includes: a main casing; a drawer movable in a first direction relative to the main casing; a process cartridge detachably mountable on the drawer; and a toner cartridge. The drawer includes a first drawer side plate and a second drawer side plate spaced apart from each other in a second direction crossing the first direction. The process cartridge includes: a photosensitive drum rotatable about an axis extending in the second direction when the process cartridge is mounted on the drawer; and a developing device for supplying toner to the photosensitive drum. When the process cartridge is mounted on the drawer and the toner cartridge is attached to the process cartridge, the toner cartridge has a length in the second direction greater than a distance in the second direction between the first drawer side plate and the second drawer side plate.

The image forming apparatus includes a cartridge replaceable by detachably mounting to the image forming apparatus, a door that takes a closed state or an open state, a locking pin that switches a state of the regulation unit between a regulating state in which the replacement unit is prevented to be detached from the image forming apparatus and a release state in which the replacement unit is to be detachable from the image forming apparatus, and a lock control unit (a control unit) that makes a determination as to whether or not the state of the regulation unit is to be switched from the release state to the regulating state, at a predetermined timing when initial processing is completed after a power source is turned on or a state of the door becomes the closed state from the open state.

An image forming apparatus including an electrode pair including two electrodes facing each other; a powder container interposed between the two electrodes and including a storage medium that is communicably coupled to the image forming apparatus; a capacitance detector configured to detect capacitance between the two electrodes; a powder container mounting determiner configured to determine whether the powder container is mounted to the image forming apparatus based on the capacitance, upon detecting that communication is not possible between the image forming apparatus and the storage medium; and an image forming execution controller configured to cause the image forming apparatus to execute image formation, upon determining, by the powder container mounting determiner, that the powder container is mounted to the image forming apparatus.

An image forming apparatus including an electrode pair including two electrodes facing each other; a powder container interposed between the two electrodes and including a storage medium that is communicably coupled to the image forming apparatus; a capacitance detector configured to detect capacitance between the two electrodes; a powder container mounting determiner configured to determine whether the powder container is mounted to the image forming apparatus based on the capacitance, upon detecting that communication is not possible between the image forming apparatus and the storage medium; and an image forming execution controller configured to cause the image forming apparatus to execute image formation, upon determining, by the powder container mounting determiner, that the powder container is mounted to the image forming apparatus.

An image forming apparatus includes an apparatus body and a unit detachably mounted to the apparatus body and comprising a unit body, a cam, a first movement member, and a second movement member. The unit includes a first contact portion, an urging portion, and a second contact portion. The second movement member is attachable to the first movement member in a first manner or a second manner. A detection pattern of a detection signal differs between a state in which the second movement member is in contact with the first contact portion and a state in which the second movement member is in contact with the second contact portion, and differs between a state in which the second movement member is attached in the first manner and a state in which the second movement member is attached in the second manner.

An image forming apparatus includes: a main body housing; a drum cartridge; a toner cartridge, which is attachable to and detachable from the drum cartridge and includes a memory having an electrical contact surface; a connector, which is configured to be in contact with the electrical contact surface, and a controller is configured to execute: connection determination processing of determining whether electrical connection with the memory is made, electrical conduction determination processing of determining whether the applying circuit is electrically conducted with the charger, and notification processing of notifying information indicating whether the drum cartridge is mounted to the main body housing and information indicating whether the toner cartridge is mounted to the main body housing, in accordance with results of the connection determination processing and the electrical conduction determination processing.

An image forming apparatus includes a casing, an image forming unit movable between an accommodated position and a shifted position, an actuator, an urging member, a cam, and a contact portion. The actuator includes a pivot shaft and a protrusion protruding therefrom. The protrusion at a standby position crosses a conveyance path and is contactable with a sheet conveyed along the conveyance path. When the image forming unit is at the accommodated position, the contact portion and the cam contact each other and maintain the protrusion at the standby position against an urging force of the urging member. As the image forming unit moves from the accommodated position to the shifted position, the contact portion and the cam move away from each other such that the protrusion pivots from the standby position, by the urging force, to a retracted position at which the protrusion is retracted from the conveyance path.

The image forming apparatus includes a cartridge replaceable by detachably mounting to the image forming apparatus, a door that takes a closed state or an open state, a locking pin that switches a state of the regulation unit between a regulating state in which the replacement unit is prevented to be detached from the image forming apparatus and a release state in which the replacement unit is to be detachable from the image forming apparatus, and a lock control unit (a control unit) that makes a determination as to whether or not the state of the regulation unit is to be switched from the release state to the regulating state, at a predetermined timing when initial processing is completed after a power source is turned on or a state of the door becomes the closed state from the open state.

An image forming apparatus includes: a main body housing; a drum cartridge; a toner cartridge, which is attachable to and detachable from the drum cartridge and includes a memory having an electrical contact surface; a connector, which is configured to be in contact with the electrical contact surface, and a controller is configured to execute: connection determination processing of determining whether electrical connection with the memory is made, electrical conduction determination processing of determining whether the applying circuit is electrically conducted with the charger, and notification processing of notifying information indicating whether the drum cartridge is mounted to the main body housing and information indicating whether the toner cartridge is mounted to the main body housing, in accordance with results of the connection determination processing and the electrical conduction determination processing.

A developing cartridge may include a rotary gear rotatable about one axis and a detection gear rotatable about another axis. The detection gear is configured to be not rotatable with the rotary gear in a case where the rotary gear rotates from a first rotational position to a second rotational position, while being configured to be rotatable with the rotary gear in a case where the rotary gear rotates from the second rotational position to a third rotational position.