Patent ID: 7729643

Claim:
A developer supply cartridge, detachably insertable into an image forming apparatus in a direction, for supplying developer to a developer receiving cartridge which is detachably insertable into the image forming apparatus in the direction and which includes first and second engaging members arranged in the direction, said developer supply cartridge comprising: a developer container configured and positioned to contain the developer, said developer container including a discharge opening configured and positioned to permit discharge of the developer toward the developer receiving cartridge, a shutter configured and positioned to open and close said discharge opening by rotation thereof about a rotation center, wherein said shutter includes: a plurality of sets of an opening portion configured to open said discharge opening and a closing portion configured to close said discharge opening, which are alternately disposed in a circumferential direction about the rotation center of said shutter; and a plurality of engaging portions which are disposed between adjacent ones of said opening portion and said closing portion respectively, and each of which is engageable with either one of the first and second engaging members to rotate said shutter so as to open and close said discharge opening irrespective of the rotational direction of said shutter with relative movement between said developer supply cartridge and the developer receiving cartridge in the image forming apparatus.