Patent ID: 7603066

Claim:
A developing device configured to supply developer to a photosensitive drum in an image forming device, comprising: (a) a first developing roller including (i) a tubular sleeve, on the surface of which developer is supplied; and (ii) a magnetic roller being arranged on an inner circumferential side of the sleeve, the magnetic roller having a drawing magnetic pole configured to draw developer and a peel-off magnetic pole configured to peel off developer, the drawing magnetic pole being arranged adjacent to and upstream of the peel-off magnetic pole in a first rotational direction during an image forming operation; and (b) a roller drive mechanism configured to rotate the magnetic roller in the first rotational direction during an image forming operation, and rotate the magnetic roller in a second rotational direction that is opposite the first rotational direction, the roller drive mechanism rotating the first developing roller in the second rotational direction at a speed lower than the speed at which the roller drive mechanism rotates the first developing roller in the first rotational direction.