Patent ID: 7333755

Claim:
A developing device comprising: a developing unit for attaching developer to a latent image formed on an image bearing body to form a visible image; a developer supply unit for supplying the developer to the developing unit; and a plurality of developer transporting units for transporting the developer in an axial direction, at least one of said plurality of developer transporting units transporting the developer in a direction different from a direction that another developer transporting unit transports the developer, each of said developer transporting units including first and second screw sections having a first screw and a second screw, respectively, said first screw having a pitch substantially same as that of the second screw, said first screw having a screw height substantially same as that of the second screw, said first screw having a length substantially same as that of the second screw, said first screw winding in a direction different from a direction that the second screw winds.