Patent ID: 8831486
Filing Date: 2014-09-09
Classification: G03G

Abstract:
1. A developing device, comprising: a case for housing a developer; a magnetic roller arranged in the case, the magnetic roller including a rotary shaft having opposite first and second axial ends spaced apart along an axial direction and configured to magnetically carry the developer on a circumferential surface by rotating about the rotary shaft; an agitating member arranged to face the magnetic roller in the case, the agitating member including a shaft center extending parallel to the axial direction and a screw forming portion defining a spiral shape arranged around the shaft center, the spiral shape being configured to agitate the developer and to convey the developer toward the first axial end while rotating about the shaft center; a layer thickness restricting member arranged to face the magnetic roller and configured to restrict the layer thickness of the developer supplied from the agitating member to the magnetic roller to a predetermined thickness; and a restricting plate arranged along the axial direction of the magnetic roller to face the circumferential surface of the magnetic roller at a side upstream of the layer thickness restricting member in a rotating direction of the magnetic roller, the restricting plate having a plurality of elongated projections configured to come into contact with the developer carried on the magnetic roller, each of the elongated projections extending in a first direction inclined with respect to a plane perpendicular to the axial direction of the magnetic roller so that developer that is not initially removed from the magnetic roller is conveyed in the first direction and mixes with the developer supplied to the magnetic roller from the agitating member.