Patent ID: 8369751

Claim:
A conveyor comprising: a rotation shaft and a plurality of convey members provided along an axial direction of the rotation shaft, wherein at least one of the plurality of convey members is an arc convey member, the arc convey member including: a rod-like arc part having an outer periphery that forms an arc forming a part of a spiral so that an angle between two perpendiculars extended from two ends of the arc is smaller than a predetermined angle, the arc part is positioned away from the shaft and its arc is not directly connected to the rotation shaft; and a support part that supports the two ends of the arc, with the outer periphery of the arc part inclined to the axial direction of the rotation shaft, wherein the support part that the arc convey member being the at least one of the plurality of arc convey members includes at least: a first support part that supports the arc part in a most upstream side along a developer conveying direction; and a second support part that supports the arc part in a downstream side of the first support part along the developer conveying direction, and the second support part has greater flexural rigidity than the first support part.