[SOLUTION] A cartridge includes a photosensitive drum and a coupling. the coupling includes a main body and a movable member movable relative to the main body. The movable member includes an engaging portion which is capable of entering between a driving force application member and a braking force application member by the movement relative to the main body. The movable member receives a driving force for rotating the photosensitive drum, from the driving force application member and also receives a braking force applying a load against rotation of the photosensitive drum, from the braking force application member.

A photosensitive member unit including a photosensitive member and a drive receiving portion receiving a driving force for rotating the photosensitive member; a developing unit joined to the photosensitive member unit so as to be movable relative to the photosensitive member unit between a first position in which a developing roller is in contact with the photosensitive member and a second position in which the developing roller is spaced from the photosensitive member; and a transmission member transmitting the driving force to the developing unit, wherein the developing unit has a driven member driven by the transmission member, and the transmission member is configured to engage with the driven member to drive the driven member with the developing unit located in the first position, and to engage with the driven member to drive the driven member with the developing unit located in the second position.

To efficiently transmit drive through couplings on one and another sides during forward rotation and reverse rotation.

When first and second couplings are brought into engagement with each other and rotated in a forward direction, first and third drive transmission surfaces are brought into contact with each other to be rotated in the forward direction while producing components of force in directions in which the first and second couplings are drawn to each other in the rotational axis direction.

When the first and second couplings are brought into engagement with each other and rotated in a reverse direction, second and fourth drive transmission surfaces are brought into contact with each other to be rotated in the reverse direction without producing components of force in directions in which the first and second couplings are separated from each other in the rotational axis direction.

A process cartridge configured to be detachably installed to a main body of the imaging device includes a housing, and a photosensitive drum arranged in the housing. A drive coupler configured to receive a driving force from a drive head of the main body of the imaging device is provided at an end of the photosensitive drum. The process cartridge can be installed to the main body of the imaging device or be detached from the main body of the imaging device in a manner that the photosensitive drum rotation axis forms a variable included angle with respect to the drive head rotation axis. The installation of the process cartridge is facilitated, and the engagement of the drive coupler with the drive head of the imaging device is facilitated.

With a structure in which a coupling member includes a sphere providing a center of inclination (pivoting), a rotational force transmitted member has an opening have a diameter smaller than that of the sphere, and the coupling member is prevented from disengaging from rotational force transmitted member by contact of inner edge of the opening to the sphere, the inner edge of the opening may limit an inclinable (pivotable) angle range of the coupling member. In a state that a pin that is a shaft portion is inserted in a hole that is a through-hole provided in a coupling member, opposite end portions of the pin are supported by a driving side flange, which is a rotational force transmitted member. The coupling member, the driving side flange, and the pin are connected in this manner, and the pin contacts the inside of the hole without limiting the inclinable angle range.

A processing cartridge is provided. The processing cartridge can be detachably mounted in an electronic imaging device including a driving component for transmitting rotating force. The processing cartridge includes a housing and a force receiving element. The force receiving element including force receiving parts is disposed at one side of the housing and is rotatably supported by the housing. The force receiving parts are disposed at an end portion of the force receiving element along a circumferential direction of the force receiving element and protrude in a direction of a rotation axis of the force receiving element. When the processing cartridge is mounted in the electronic imaging device along a predetermined mounting direction, the force receiving parts and the driving component are engaged with each other to transmit the force.

A control member 76 for controlling transmission and blocking of a rotational force by a clutch is rotatably supported by a supporting member which supports a developing frame. a locking portion provided on the control member 76 rotates between a position retracted from a locked portion of the clutch and a position for engaging with the locked portion.

A developing cartridge may include a housing including an outer surface, a small-diameter gear, a large-diameter gear, a first gear, and a moving member. The small-diameter gear may include a first engaging portion positioned on at least a portion of a peripheral surface of the small-diameter gear. The large-diameter gear may be positioned farther from the outer surface than the small-diameter gear from the outer surface. The large-diameter gear may be rotatable together with the small-diameter gear. The first gear may include a second engaging portion, a first end surface, a second end surface, and at least one protrusion. The moving member may include a contact portion configured to move the moving member from one position to another position in a state where the contact portion is in contact with the protrusion.

A drive transmission device includes: a first rotating member that rotates with driving power received from a driving source, a second rotating member that rotates with driving power from the first rotating member, and a driving-side engagement member and a driven-side engagement member for transmitting the driving power of the first rotating member to the second rotating member, wherein the driving-side engagement member and the driven-side engagement member engage with each other in a state in which the first rotating member is rotating whereby a power applying portion and a power receiving portion engage with each other while resisting against a second biasing power.

A process cartridge is provided. The process cartridge includes a housing, a rotation member rotatably mounted in the housing, and a support mounted on the housing. The rotation member includes a station unit and a drive unit coupled to the rotation unit. The drive unit further comprises a drive transmission device and an actuating rod coupled to the drive transmission device. The support includes a notch allowing the actuating rod to pass through, When the actuating rod receives an applied force, the actuating rod swings in a plane defined by a longitudinal direction and a horizontal direction of the process cartridge.