Patent ID: 8781372

Claim:
An image forming apparatus, comprising an image bearing member for bearing a toner image on a circumferential surface, a developing device including a developing roller for supplying toner to the circumferential surface of the image bearing member, and a toner container to be removably assembled with the developing device for supplying toner to the developing device, wherein: the toner container is assembled with the developing device along an assembling direction perpendicular to an axial direction of the developing roller and the toner container includes: a container main body in which the toner is contained, a rotating member which is arranged in the container main body and rotatably supported in the container main body, and an input gear which is provided rotatably about an axis parallel to the assembling direction and to which a rotational drive force for rotating the rotating member is to be input; the developing device includes: a housing main body in which the developing roller is housed, a container mounting portion which is arranged on the housing main body and to which the toner container is to be mounted, a movable member which includes an output gear which rotates about an axis parallel to the assembling direction upon receiving a rotational drive force from outside and is so supported on the housing main body as to be displaceable to a first position where the input gear and the output gear are engageable and a second position retracted outward from the first position, and a biasing member which biases the movable member to the first position; the container main body includes a container side contact portion, the movable member includes a movable member side contact portion, and the container side contact portion comes into contact with the movable member side contact portion in a mounting process of mounting the toner container to the container mounting portion of the developing device; the container side contact portion comes into contact with the movable member side contact portion in the mounting process, thereby displacing the movable member from the first position to the second position against a biasing force of the biasing member as the toner container moves in the assembling direction; and when the toner container reaches a predetermined assembled position, a contact state of the container side contact portion and the movable member side contact portion is released, whereby the movable member is returned to the first position by the biasing force of the biasing member.