Patent ID: 7751758

Claim:
A developer supply cartridge, detachably insertable into an image forming apparatus, for supplying a developer to a developer receiving cartridge which is detachably insertable into the image forming apparatus and which has first and second engaging members, said developer supply cartridge comprising: a developer container having an inner space adapted to contain the developer and a discharge opening for permitting discharge of the developer toward the developer receiving cartridge; and a shutter member configured and positioned to open and close said discharge opening by rotation thereof, said shutter member including: first and second engaging portions engageable, respectively, with the first and second engaging members so as to receive, from the developer receiving cartridge, a force for rotating said shutter member during the operation of inserting said developer supply cartridge or the developer receiving cartridge into the image forming apparatus; and a plurality of communicating portions capable of fluid communication with said discharge opening irrespective of the rotational direction of movement of said shutter member by the force.