| 摘要 |
A developer supply container detachably mountable to a main assembly of an image forming apparatus includes a developer containing portion for containing a developer; a developer discharge opening disposed at the developer containing portion; a container-side engaging portion for fixing the developer containing portion by being engaged with a main assembly-side engaging portion provided in the main assembly in the mounted state of the container; an operation member capable of performing a moving operation in the mounted state of the container; and a transmitting portion, provided in the operation member, for transmitting a driving force for opening and closing the developer discharge opening to a relay portion provided in the main assembly. In the mounted state of the container, the operation member is capable of opening and closing a main assembly shutter member, provided in the main assembly, for opening and closing the developer discharge opening through the relay portion. The container-side engaging portion is movable by movement of the operation member so that it retains engagement thereof with the main assembly-side engaging portion when the operation member is moved in a opening direction for opening the main assembly shutter member and so that it releases the engagement when the operation member is moved in a closing direction for closing the main assembly shutter member. A position of the operation member when the container-side engaging portion is located in a position to release the engagement is away, in the closing direction, from a position thereof when the container-side engaging portion is located in a position to be engaged with the main assembly-side engaging portion during mounting of the container.
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