| 摘要 |
PROBLEM TO BE SOLVED: To enable developer to be mixed and agitated sufficiently by reducing stay of developer in an agitating conveyance part.SOLUTION: A rotation shaft 111a of an agitating conveyance part 110 is provided with a spiral vane 111b, a normal two-spiral vanes 111d, a gap part 111e, a reverse two-spiral vane 111f, and a short lead reverse spiral vane 111g, all of which agitate developer while conveying it. Each of the spiral vanes 111d and 111f is formed from two spirals and they are reverse to each other. Also, they have the same lead as the spiral vane 111b, and their respective ends, which are adjacent to each other, are formed so as to coincide in the direction of rotation. The spiral vanes 111d and 111f, the short lead reverse spiral vane 111g, and the end on the normal two-spiral vane 111d of the spiral vane 111b are formed as large-diameter parts 111h, which are larger than the other portion of the spiral vane 111b. A supply conveyance part 120 is disposed above the agitating conveyance part 110, and it is partitioned by a partition 141 with a communication part 142 formed in the partition. |
