A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main-assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.

A process cartridge includes a first unit including an image bearing member configured to carry an electrostatic latent image, and a second unit including a developer bearing member configured to develop the electrostatic latent image carried on the image bearing member into a toner image, the second unit being capable of being mounted on the first unit in a mounting direction. The first unit includes a moving member that moves the second unit mounted on the first unit at a mounting position to a detachment position. The second unit includes a storage unit that stores information about the second unit. The moving member is disposed on a first side of the process cartridge in a longitudinal direction of the image bearing member. An electrode of the storage unit is disposed on a second side of the process cartridge in the longitudinal direction.

There are provided a movable member 80; a regulating member 90 movable between a regulating position for restricting movement of the movable member 80 and a non-regulating position not restricting movable member 80. By movement of the movable member 80 between a first position and a second position, a position of an end 80d of the movable member 80 in a direction of an axis L1. An end portion 80d is closer to a coupling member 63 in the direction of the axis L1 when the movable member 80 is in a second position than when it is in the first position. When the regulating member 90 is in the regulating position, the movement of the movable member 80 from the first position to the second position is restricted. When the regulating member 90 is in the non-regulating position, the movement of the movable member 80 from the first position to the second position is permitted. The movable member 80 includes a rotatable portion 81 contacting the regulating member 90 taking the regulating position.

A developing device includes a developing unit, swingably supported, for supplying a developer to an image bearing member, and including an inwardly extending wall portion. In an attitude during use, when against an urging force of an urging member configured to urge the developing unit in a first direction toward the image bearing member, the developing unit is moved in a second direction opposite to the first direction, the inwardly extending wall portion is contactable to a restricting member for restricting an amount of movement of the developing unit in the second direction.

A process cartridge includes a first unit including an image bearing member configured to carry an electrostatic latent image, and a second unit including a developer bearing member configured to develop the electrostatic latent image carried on the image bearing member into a toner image, the second unit being capable of being mounted on the first unit in a mounting direction. The first unit includes a moving member that moves the second unit mounted on the first unit at a mounting position to a detachment position. The second unit includes a storage unit that stores information about the second unit. The moving member is disposed on a first side of the process cartridge in a longitudinal direction of the image bearing member. An electrode of the storage unit is disposed on a second side of the process cartridge in the longitudinal direction.

A technique enabling downsizing of an image forming apparatus is provided. A cleaning unit 13 attachable to and detachable from an apparatus main body of an image forming apparatus 100 that forms an image on a recording material 12 is provided, with this cleaning unit 13 including: a photosensitive drum 1; and a cleaning frame body 14 that supports the photosensitive drum 1 and that includes an opening 14c through which laser light 3c for exposing the photosensitive drum 1 can pass, wherein the opening 14c is configured such that a width of the opening 14c in a scanning direction in an irradiation range of the light for exposing the photosensitive drum 1 becomes greater toward a side of the photosensitive drum 1 from a side of a light source of light for exposing the photosensitive drum 1.

Provided is an image forming unit including a photosensitive unit including an image bearing member, a developing unit including a developer bearing member and a container capable of containing a developer, a rotation shaft, the developing unit being rotated around the rotation shaft and positioned at one of a development position where the developer bearing member supplies the developer to the image bearing member and a separation position where the developer bearing member separates from the image bearing member, and a sensing portion sensing a variation or an amount corresponding to an amount of the developer contained in the developing unit. The rotation shaft is located below a developing portion, which is formed of the image bearing member and the developer bearing member, in a gravity direction.

A toner cartridge according to one example includes first and second alignment guides that extend outward from a first side and a second side of the toner cartridge, respectively, for positioning the toner cartridge. The first and second alignment guides define a pivot axis about which the toner cartridge is pivotable relative to an imaging unit when the toner cartridge is installed on the imaging unit. An engagement member is positioned on a rear of the toner cartridge for receiving a bias force for biasing the toner cartridge about the pivot axis when the toner cartridge is installed on the imaging unit. The engagement member is positioned next to the bottom of the housing. The engagement member includes an angled contact surface that faces upward and rearward for contacting a corresponding hold-down on the imaging unit when the toner cartridge is installed on the imaging unit.

A developing device includes a developing unit, swingably supported, for supplying a developer to an image bearing member, and including an inwardly extending wall portion. In an attitude during use, when against an urging force of an urging member configured to urge the developing unit in a first direction toward the image bearing member, the developing unit is moved in a second direction opposite to the first direction, the inwardly extending wall portion is contactable to a restricting member for restricting an amount of movement of the developing unit in the second direction.

A cartridge includes a first unit including an image bearing member and a second unit including a developer bearing member. The second unit is swingable with respect to the first unit. The second unit includes a pressed portion to be pressed by a pressing member of the apparatus body. When viewed in an axial direction, (i) the swing axis and the pressed portion are arranged on opposite sides to each other with respect to a virtual straight line, (ii) the pressed portion, the swing axis, and the first axis are arranged in the named order in an interaxial direction, and (iii) a distance from the pressed portion to the swing axis in the interaxial direction is longer than a distance from the swing axis to the first axis in the interaxial direction.