An opening-closing member of an image forming apparatus includes: an external opening-closing member that configurates a part of an outer surface of the image forming apparatus and that is openable and closable; an internal opening-closing member that faces an inner surface of the external opening-closing member and that is openable and closable together with the external opening-closing member; and a container that defines a containment space by protruding from the internal opening-closing member toward the external opening-closing member and that enables a member contained in the containment space to be taken out when the external opening-closing member and the internal opening-closing member are opened.

One of two walls apart from each other in a first direction has an opening. A drum cartridge includes a photosensitive drum rotatable about a drum axis extending in the first direction when the drum cartridge is attached to a housing. The drum cartridge is movable through the opening between a first position at which an entirety of the drum cartridge is located inside the housing and a second position at which at least part of the drum cartridge is located outside the housing. The development cartridge includes a development roller rotatable about an axis extending in the first direction. The development cartridge is unattachable to and undetachable from the drum cartridge in a state where the drum cartridge is located at the first position. The development cartridge is attachable to and detachable from the drum cartridge in a state where the drum cartridge is located at the second position.

A process cartridge detachably mountable to a main assembly of an image forming apparatus, the process cartridge includes a photosensitive drum unit including a photosensitive drum, and a first and second positioning portions Configured to position the photosensitive drum unit relative to the main assembly; and a developing unit connected with the photosensitive drum unit, the developing unit including a developing roller, a storing means having a contact surface electrically connectable with a main assembly contact of the main assembly to communicate with the main assembly. As seen in an axial direction of the photosensitive drum, a first line segment connecting the first positioning portion and the second positioning portion with each other and a first linear line passing through the contact surface and perpendicular to the contact surface crosses with each other.

A second unit includes a restricted portion that comes into contact with a restricting portion provided to a body of an apparatus, the restricted portion coming into contact with the restricting portion, in order to restrict the movement of a developer carrier in a direction to make contact with an image carrier, when a developing cartridge has not reached a predetermined attachment position, and not coming into contact with the restricting portion when the developing cartridge is in the predetermined attachment position.

An image forming apparatus includes: a first guide that is provided in an apparatus housing and configured to suspend and hold a first unit including an image holder so that the first unit is movable in an insertion and removal direction; a second guide that is provided in the apparatus housing and configured to suspend and hold a second unit including a developer holder so that the second unit is movable in an insertion and removal direction; and a pedestal that is disposed on a front side in the insertion and removal direction with respect to the first guide and the second guide, supports, from below in a gravity direction, the first unit and the second unit while the first unit and the second unit are inserted into the apparatus housing, and does not contact with the first unit and the second unit located in the apparatus housing.

In accordance with aspects of the disclosed subject matter, an image forming apparatus can include a main body housing having a space inside. The main body housing can include a front wall having an opening, and a rear wall, the front wall and the rear wall defining a space therebetween. A drum cartridge can include a photosensitive drum, and a developing cartridge can include a developing roller. A drawer can be provided for supporting the drum cartridge and the developing cartridge, the drawer being movable between an inner position where the drawer is accommodated inside the space and an outer position where at least a part of the drawer is drawn out of the space through the opening. A transfer roller can be located nearer to the rear wall than the developing roller locates when the drawer supporting the drum cartridge and the developing cartridge is at the inner position.

An image forming apparatus includes a cartridge including a portion-to-be-engaged; a main assembly to which the cartridge is detachably mountable; and an operating portion configured to be operated when the cartridge is disengaged from the main assembly. The main assembly includes a cartridge disengagement restricting mechanism configured to restrict disengagement of the cartridge, the cartridge disengagement restricting mechanism comprises an engaging portion for engaging with the portion-to-be-engaged of the cartridge so as to restrict movement of the cartridge in a disengaging direction in which the cartridge is disengaged from the main assembly; a restricting portion movable between a first position where a releasing operation of the operating portion for releasing engagement between the portion-to-be-engaged and the engaging portion and a second position where the releasing operation is permitted; and an actuator configured to move the restricting portion between the first position and the second position.

A second unit includes a restricted portion that comes into contact with a restricting portion provided to a body of an apparatus, the restricted portion coming into contact with the restricting portion, in order to restrict the movement of a developer carrier in a direction to make contact with an image carrier, when a developing cartridge has not reached a predetermined attachment position, and not coming into contact with the restricting portion when the developing cartridge is in the predetermined attachment 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.

In an image forming apparatus having a housing; a cartridge including an image bearing member and capable of being attached/detached to/from the housing; a discharging exposure unit having a light source member and a light guide member, which forms a light guide path guiding light from the light source member so as to be emitted to the image bearing member, and exposing the image bearing member; and an opening/closing member capable of being opened/closed and provided on a surface on which an opening portion, through which the cartridge is inserted/removed in the housing, is provided so as to cover the opening portion, wherein the light source member is provided so as to be exposed to a surface of the housing opened/closed by the opening/closing member and be capable of being attached/detached to/from the light guide member.