Patent ID: 7702260

Claim:
A development device comprising a plurality of development cartridges which are assembled to each other to form the development device, wherein each of the development cartridges comprises a part of a drive member for switching development colors, and a rotation spindle; wherein when each developer cartridge is at a development position where a development roller is in contact with a photoreceptor, said development cartridges are each driven by their own respective part of the drive member for switching development colors; wherein each of the development cartridges further comprises a connection section for establishing direct connection with other of the development cartridges, and a plurality of the development cartridges are connected through the connection sections so that a part of the drive members are combined to constitute a series of gears; and wherein each of the development cartridges further comprises a part of a rotation spindle, and a plurality of the development cartridges are connected through the connection sections so that a part of the rotation spindles are combined to form a column shape.