Patent ID: 8244155

Claim:
A developer cartridge to be detachably mounted into an apparatus main body of an image forming apparatus with an opening door of the apparatus main body opened and adapted to supply developer to the apparatus main body, comprising: a cartridge main body with a supply port for supplying the developer to the apparatus main body, a conveying member arranged in the cartridge main body for conveying the developer toward the supply port; a shutter member displaceable between an opening position for opening the supply port and a closing position for closing the supply port; an operation lever arranged to face the opening cover and adapted to displace the shutter member between the opening position and the closing position, the operation lever being displaceable between an opening posture corresponding to the opening position and a closing posture corresponding to the closing position; an interlocking mechanism for causing the conveying member to convey the developer as the operation lever is displaced from the closing posture to the opening posture; and a biasing member for biasing the operation lever toward the closing posture, wherein the operation lever is displaced from the closing posture to the opening posture against a biasing force of the biasing member due to interference with a part of the opening cover when the opening cover is closed.