Patent ID: 7400847

Claim:
A developer receiving cartridge, detachably mountable to an image forming apparatus in a direction, for receiving a developer from a developer supply cartridge including a discharge opening for permitting discharge of the developer toward said developer receiving cartridge and a shutter member for opening and closing the discharge opening by rotation thereof, detachably mounted to the image forming apparatus in the direction, said developer receiving cartridge comprising: a container configured to contain the developer received from the developer supply cartridge through a receiving opening formed in said container; and an engaging member configured and positioned to engage the developer supply cartridge to rotate the shutter member so as to open the shutter member, wherein said engaging member includes a first engaging member configured and positioned to open the shutter member by rotating the shutter member in a first rotational direction and a second engaging member configured and positioned to open the shutter member by rotating the shutter member in a second rotational direction which is opposite the first rotational direction, and wherein said first engaging member and said second engaging member are disposed substantially in a line extending in the direction.