Developer cartridge having an automatic lid closing mechanism

A developer cartridge for supplying a developer to a developer receiving unit, the cartridge comprising:

• a main body storing a developer to be supplied to the developer receiving unit;
• a guiding portion engagable with guiding means of the developer receiving unit so that the cartridge is movable in a first direction from a first position, where the cartridge is loaded into and unloaded from the developer receiving unit, to a second position, where developer in the main body is to be supplied to the developer receiving unit, and is movable in a second direction, opposite the first direction, from the second position to the first position;
• and
• a lid member for opening and closing a developer outlet of the main body of the cartridge,
• wherein said lid member is moved in the second direction to open the outlet when the cartridge is positioned at the second position, and is moved in the first direction to close the outlet when the cartridge is positioned at the second position, said lid member comprising an engagement portion engagable with an engagement portion provided on the developer receiving unit when the cartridge is moved in the second direction from the second position to the first position and when the lid member is not at a predetermined position where it completely closes the outlet, and
• wherein, when the engagement portion of the lid member is engaged with the engagement portion of the developer receiving unit, movement of the cartridge in the second direction causes the lid member to move in the first direction relative to the main body of the cartridge, thereby moving the lid member to the predetermined position.