Patent ID: 7974556
Filing Date: 2011-07-05
Classification: G03G

Abstract:
1. A development device comprising: a screw conveyer to convey powder contained in a development casing in a direction along a shaft of the screw conveyer; a bearing in which the screw conveyer is inserted; a cylindrical member provided around the screw conveyer and disposed between the screw conveyer and the bearing, the cylindrical member including a flange portion that projects from the cylindrical member toward an outside diameter of the shaft of the screw conveyer; and a powder pressure disperser to reduce pressure of the powder transported by the screw conveyer, provided upstream from the flange portion in a direction in which the screw conveyer conveys the powder, the powder pressure disperser provided around and extending outward in directions perpendicular to the shaft of the screw conveyer and having an outer diameter larger than an outer diameter of the flange portion, the powder pressure disperser being formed of a material whose heat-conductivity is lower than that of the cylindrical member.