Patent ID: 8099027

Claim:
A developer containing device comprising: a developer container configured to contain developer and to be inserted into a receptacle defined in an image forming apparatus main body; a developer feed inlet provided in the developer container and for feeding the developer contained in the developer container into the image forming apparatus main body; and an opening and closing member that opens the developer feed inlet with movement of the developer container in the insertion direction when the developer container is inserted into the receptacle and closes the developer feed inlet with movement of the developer container in opposition to the insertion direction when the developer container is removed from the receptacle, the opening and closing member having a protrusion formed to protrude inward of the opening and closing member and allowed to engage with a recess provided in the developer container, and having a second protrusion in the rear end of the opening and closing member with regard to the insertion direction, formed to protrude inward of the opening and closing member, and being arranged to be allowed to move on the outside of the developer container in a direction intersecting with the insertion direction of the developer container, when the developer container is inserted into the receptacle, a developer container outside section sliding into the opening and closing member being relatively brought to one side of the opening and closing member in the direction intersecting with the insertion direction of the developer container, then the protrusion being released from the an engageable state, when the opening and closing member moves to close the developer feed inlet, the rear end of the opening and closing member with regard to the insertion direction is pressed against the restrainers provided in the receptacle at least, and when the developer container is moved in opposition to the insertion direction with the developer feed inlet being opened by the opening and closing member, the protrusion moves to a position where the protrusion can engage with the recess of the developer container.