Developer conveying device, and developing device and image forming apparatus provided with same

摘要

A developer conveying device includes a housing (70A), a developer conveyance path (74a, 74b) and a conveying member (72, 73). The developer conveyance path extends between a pair of wall portions. The conveying member includes a spiral member (721, 731), an inner wall portion (721S, 731S) and shaft portions /26, 727, 736, 737). The spiral member is formed by connecting spiral pieces, each forming one spiral turn, in a conveying direction of the developer and includes a hollow interior formed by the connected spiral pieces. The inner wall portion includes 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. The shaft portions are arranged at opposite end parts of the spiral member, rotatably supported on the wall portions and serve as a rotary shaft for the rotation of the conveying member.