| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotor unit capable of preventing a drop of the rotational precision. SOLUTION: A photosensitive unit 1 is composed of a photosensitive drum 3 in cylindrical shape mounted on a rotary shaft 5 removably, a first flange 7 in cylindrical shape attached to one end of the drum 3, a second flange 9 attached to the other end of the drum 3, a bearing 11 fixed to the rotary shaft 5 of the drum 3, and a knob 10 fixed to the tip of the rotary shaft 5 removably and pressing the second flange 9 to the bearing 11, wherein the bearing 11 is equipped with a stopper part 11a to restrict the movement in longitudinal direction of the drum 3 and a transmission part 11b in cylindrical shape positioned at the inside circumference of the first flange 7, and the transmission part 11b is furnished at the peripheral surface with at least three engaging projections 13 having one identical shape in such a way as protruding at a constant spacing on the peripheral surface, while the first flange 7 is furnished at the inside surface with engaging projections 15 having one identical shape wherewith the first named projections 13 are in engagement respectively, and when they are engaged with one another, the first distances H between the contacts and the center of the rotary shaft 5 remain the same.
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