| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rotor unit which is capable of reducing the variation in peripheral speed of a first rotor or a second rotor. <P>SOLUTION: The rotor unit includes: a first rotor (photosensitive drum 120) which is rotationally driven by input of driving force from the outside; a second rotor (cleaning roller 150) which has an outer peripheral surface 151 brought into contact with an outer peripheral surface 121 of the first rotor and is dependently rotated by friction with the outer peripheral surface 121 of the rotationally driven first rotor; a first gear 170 provided so as to be rotated integrally with the first rotor; and a second gear 180 provided so as to be rotated integrally with the second rotor and directly engaged with the first gear 170. A radius r1 of a pitch circle P1 of the first gear 170 is shorter than a radius r2 to the outer peripheral surface 121 of the first rotor, and a radius r3 of a pitch circle P2 of the second gear 180 is longer than a radius r4 to the outer peripheral surface 151 of the second rotor. <P>COPYRIGHT: (C)2013,JPO&INPIT |
