Patent ID: 9703236
Date: 2017-07-11
CPC Classifications: G03G

Claim:
1. A powder transport member comprising: a rotation shaft that is rotationally driven; a spiral wire that is wound in a spiral shape in a diameter larger than an outer diameter of the rotation shaft at a predetermined pitch interval and that is formed to be insertable from one end side of the rotation shaft; and holding parts that are disposed near opposite ends of the rotation shaft respectively and that hold opposite end portions of the spiral wire in a rotation-prevented state, wherein one end portion of the spiral wire comprises a terminal end circular arc portion formed in a circular arc shape, and a bent portion bent to a center side of the rotation shaft is formed at a tip end of the terminal end circular arc portion, and wherein the holding part that holds the one end portion of the spiral wire comprises a pair of protrusions at symmetrical positions with a center of the rotation shaft being interposed therebetween, a concave portion configured to accommodate an inner peripheral surface of the terminal end circular arc portion is formed at a protruding end portion of each of the protrusions, and a size of the protruding end portion of the protrusion in a direction of the rotation shaft is less than ½ of an inter-wire distance obtained by subtracting a wire diameter of the spiral wire from a pitch of the spiral wire.