Patent ID: 8600271

Claim:
A develop unit comprising: a magnet roller comprising a magnetic field generator being columnar, a support element being columnar, coaxially provided at both ends of the magnetic field generator, the support element having a diameter smaller than that of the magnetic field generator, a level element extending along an axis of the magnetic field generator, with a distance of the level element from the axis being larger than a radius of the support element, and a high magnetic power element being a main magnetic pole provided on the level element, extending longitudinally along the axis of the magnetic field generator; and a develop roller comprising a cylindrical hollow element containing the magnet roller and rotatable around the axis of the magnetic field generator, wherein the high magnetic power element is disposed on the level element so that a longitudinal central line on a face of the high magnetic power element contacting with the level element is shifted, relative to an axial central line of the level element, downstream of a rotary direction of the hollow element.