Patent ID: 7817938

Claim:
A developer cartridge comprising: a developer roller, a receiving unit configured to receive a driving force, wherein the receiving unit includes a first gear that is connected with a second gear inputting the driving force, a transmitting unit configured to transmit the driving force from the receiving unit to the developer roller, wherein the transmitting unit includes a third gear, a first unit having the first gear, a housing provided with the developer roller, a transferring unit configured to transfer the drive force from the receiving unit to the transmitting unit, the transferring unit being connected with both the receiving unit and the transmitting unit, wherein the third gear is connected to the first gear via the transferring unit a second unit having the developer roller and the third gear, and movable with respect to the first unit, wherein the transferring unit is disposed between the first gear and the third gear, an inner gearbox provided with the third gear and attached to the housing relatively unmovably to the housing, and an outer gearbox provided with the first gear and attached to the inner gearbox relatively movably to the inner gearbox, wherein a relative position of the receiving unit and the transmitting unit is movable while the transferring unit is connected to both the receiving unit and the transmitting unit.