Patent ID: 8913925

Claim:
A developer conveying device, comprising: a housing with a pair of wall portions; a developer conveyance path extending between the pair of wall portions; and a conveying member rotatably supported on the wall portions and configured to convey developer from one wall portion to the other; wherein the conveying member includes: a spiral member having opposite first and second end parts and being formed by connecting spiral pieces, each of the spiral pieces forming one spiral turn, in a conveying direction of the developer and including a hollow interior formed by the connected spiral pieces; an inner wall portion including a plurality of planar portions which define the hollow interior of the spiral member and are connected at predetermined angles in a circumferential direction of the rotation of the conveying member in a cross-section intersecting an axial direction of the conveying member, the planar portions constituting inner surfaces of the spiral pieces; first and second shaft portions arranged respectively at the opposite first and second end parts of the spiral member, rotatably supported on the wall portions and serving as a rotary shaft for the rotation of the conveying member; the hollow interior is formed between the first and second shaft portions; and the conveying member has no other shaft part in the hollow interior.