Patent ID: 7483651

Claim:
A drive device that drives a rotating body in an image forming device, comprising: a motor having a rotation shaft; a planetary roller type power transmission unit having a plurality of planetary rollers having at least a part thereof made from an elastic material being pressed against the periphery of said motor rotation shaft, a ring having a projecting portion on an outer surface thereof, and an internal surface being configured to contact said plurality of planetary rollers, a fixed body being disposed to cover said ring and having an aperture located corresponding to said projecting portion of said ring, a width of the aperture being configured to permit said projecting portion to move a predetermined distance, a carrier roller being configured to rotate in conjunction with the rotation of said planetary rollers, and an output shaft being configured to output the rotation of said carrier roller to an image forming unit; and a drive control unit being configured to control the rotation of said motor being configured to drive said projecting portion to reciprocate within the aperture of said fixed body when said image forming unit is not carrying out an image forming operation.