Patent ID: 7519315

Claim:
A developing system for an image forming device, comprising: a photosensitive drum; and a developing unit including a developing roller arranged at the developing position and configured to support a developer, the developing roller comprising a drawing magnetic pole configured to independently draw the developer onto a surface of the developing roller, and a peel-off magnetic pole configured to peel off the developer from the surface of the developing roller, an agitation transport unit arranged below and substantially center of the developing roller and configured to agitate and transport the developer in the axial direction and supply the developer to the developing roller, and a guide member having a sloping surface that guides the developer peeled off from the surface of the developing roller to the agitation transport unit, the peel-off magnetic pole being arranged within a horizontal region of the sloping surface, and the drawing magnetic pole being arranged outwardly in the horizontal direction from the lower end of the sloping surface, the photosensitive drum being arranged lateral to the developing roller and substantially lateral to the outer periphery of the agitation transport unit.