| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent irregularity in the rotation of a photosensitive material without using an expensive sensor, and without making the structure complicated and large in size. SOLUTION: A photoreceptor driving gear 2 made of a resin is engaged with a pinion 37 at the driving source side. A cylindrical part 16 of a gear holding member 3 is inserted with pressure into an axis hole 6 of the photoreceptor driving gear 2, and fitted so as to be freely moved in the radial direction against a photoreceptor driving axis 18. A couple of centering plates 4, 5 are each fixed to the side face of the gear holding member 3, and a standard hole 25 of the couple of centering plates 4, 5 is engaged with the photoreceptor driving axis 18. After the gear holding member 3 engaged with the photoreceptor driving gear 2 has been subjected to centering control in the radial direction against the axis center of the standard hole 25, the couple of centering plates 4, 5 are fixed to the gear holding member 3. The photoreceptor driving gear 2 and the centering plates 4, 5 are prevented from rotating by first driving pins 15, and the gear holding member 3 and the photoreceptor driving axis 18 are prevented from rotating by a second driving pin 21. |
