Patent ID: 7555249

Claim:
A developer supply cartridge for supplying a developer into a process cartridge, said developer supply cartridge being detachably mountable to a main assembly of an electrophotographic image forming apparatus, wherein the process cartridge includes an electrophotographic photosensitive drum, a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum, a receiving-side shutter portion movable between a developer-reception-permitting position for opening a developer receiving opening for receiving the developer to be used by said developing roller for a developing operation and a developer-reception-preventing position for closing the developer receiving opening, a receiving-side movable portion movable to interrelatedly move the receiving-side shutter portion between the developer-reception-permitting position and the developer-reception-preventing position, the receiving-side movable portion including a receiving-side operating portion which takes an operating position when the receiving-side shutter portion is at the developer-reception-permitting position, and a regulating member for regulating movement of the receiving-side movable portion when the receiving-side operating portion is at the operating position, said developer supply cartridge comprising: a supplying-side developer accommodating portion for accommodating the developer; a developer supply opening for supplying the developer from said supplying-side developer accommodating portion into the process cartridge through the developer receiving opening; a supplying-side shutter portion movable between a developer-supply-permitting position for opening said developer supply opening and a developer-supply-preventing position for closing said developer supply opening; and a supplying-side movable portion movable, when said developer supply cartridge enters the main assembly of the apparatus in a state that the process cartridge is set in the main assembly of the apparatus, to interrelatedly move said supplying-side shutter portion from the developer-supply-preventing position to the developer-supply-permitting position by engaging the receiving-side operating portion of the receiving-side movable portion when the receiving-side operating portion is positioned at the operating position and the movement of the receiving-side operating portion is regulated by the regulating member.