Patent ID: 7965962

Claim:
A developing device comprising: a developing housing that supports a developer carrier; and a developer cartridge comprising: a cartridge housing that is configured to accommodate developer; an agitator that is provided in the cartridge housing and is configured to agitate the developer by a driving force; a transmission gear that is configured to transmit the driving force to the agitator and the transmission gear is configured to rotate about a rotation axis of the transmission gear; and an agitator gear that is provided on a rotating shaft of the agitator and meshes with the transmission gear, wherein the developing housing comprises a moving gear that is movable between a meshing position in which the moving gear meshes with the transmission gear and a spaced-apart position in which the moving gear is spaced apart from the meshing position, wherein the moving gear is configured to transmit the driving force from the transmission gear to the agitator, and wherein the rotation axis of the transmission gear is pivotable about the rotating shaft of the agitator.