Patent ID: 7539445

Claim:
An image forming apparatus, to which a developer supply container is detachably mountable, capable of supplying a developer to a portion to be supplied with the developer of a main assembly of the image forming apparatus by performing transmission of a driving force between a mounted developer supply container and the main assembly of the image forming apparatus, the image forming apparatus comprising: a developer receiving opening to be disposed at a position opposite of a developer discharge opening of the mounted developer supply container; a relay gear train for receiving a driving force from a first transmitting portion, provided to an operation member of the mounted developer supply container for transmitting the driving force for opening and closing a developer supply opening, and for transmitting the driving force to a second transmitting portion, provided to the mounted developer supply container, for transmitting the driving force; and an apparatus shutter member for receiving the driving force from the second transmitting portion to open and close said developer receiving opening, wherein said relay gear train comprises a plurality of gears which have a common rotational axis and are different in number of teeth, wherein one of said plurality of gears of said relay gear train is provided with a gear side abutting portion for abutting against a container side abutting portion provided on the developer supply container when the developer supply container is mounted into the image forming apparatus main assembly, and wherein the container side abutting portion abuts against said gear side abutting portion to rotate said relay gear train when the developer supply container is mounted into the image forming apparatus main assembly.