An according to an aspect, a paper feed device includes a device body and a paper feed cassette inserted into the device body along an insertion direction. The paper feed device includes a lock lever mounted to the paper feed cassette via a lever shaft; a spring that applies a rotational force which rotates the lock lever in an engagement direction; and a lock member provided at the device body.

An image forming apparatus includes a housing, a charging roller, an image forming section, a bearing member, a holding member, an urging member, a fixing section, and an unfixing section. A cylindrical image bearing body is attached to the housing. The charging roller comes into contact with the surface of the image bearing body and charges the surface. The image forming section forms an image on the charged surface. The holding member holds the bearing member. The urging member urges the bearing member in a first direction. The fixing section fixes the bearing member in a first position. The unfixing section separates the charging roller from the surface of the image bearing body and positions the holding member in the housing, unfixes the bearing member, moves the bearing member to a second position, and brings the charging roller into contact with the surface of the image bearing body.

A process cartridge includes: a drum cartridge; and a developing cartridge. The drum cartridge includes: a drum frame; a photosensitive drum rotatable about a first axis extending in a first direction; and a first memory having a first electrical contact surface. The developing cartridge is attachable to the drum frame and includes: a casing; a developing roller rotatable about a second axis extending in the first direction; a second memory having a second electrical contact surface; and a developing holder holding the second electrical contact surface such that the second electrical contact surface is movable relative to the casing. The drum cartridge further includes an elastic member that can expand and contract in a second direction crossing the first direction. The developing holder is connected to the elastic member and is movable in the second direction in a state where the developing cartridge is attached to the drum frame.

An image forming apparatus includes a main housing, a drawer, and a cartridge. The drawer is movable between an inside position inside the main housing and an outside position outside the main housing. The cartridge is installable into and removable from the drawer. The cartridge includes a photosensitive drum configured to rotate about a drum axis. The drawer comprises a lock member movable between a lock position in which the drawer is locked to the main housing, and an unlock position in which the drawer is unlocked from the main housing. The cartridge installed in the drawer is rotatable about the drum axis between a first position and a second position. The lock member is positioned in the lock position when the cartridge is positioned in the first position, and positioned in the unlock position when the cartridge is positioned in the second position.

A sheet feeding apparatus includes a casing configured to be connected under an upper casing to which an upper storage portion is drawably attached, a storage portion drawably attached to the casing, and a lock mechanism configured to switch between a locked state, in which the lock mechanism locks the casing and the upper casing to prevent the casing and the upper casing from being separated from each other, and an unlocked state. In in a case where the lock mechanism is in the locked state, a whole of the lock mechanism is positioned outside a movement trajectory of the upper storage portion. In a case where the lock mechanism is in the unlocked state, at least a portion of the lock mechanism is positioned inside the movement trajectory of the upper storage portion.