| 摘要 |
PURPOSE:To stop and fix rotation at an accurate position by forming holes for positioning concentrically with the rotating shaft of a rotary disk, and inserting a pin which is movable at right angles to the surface of the rotary disk into a desired positioning hole in the disk. CONSTITUTION:Four positioning holes 11 corresponding to developing units 4-7 are bored on a concentric circle at the periphery of the fixing disk 0 for the shaft 1. A fixed pin 15 is inserted into a hole 4 from its opening side and engaged slidably with the hole 14, and the pin is positioned selectively at an operation position where the pin extends beyond a groove 14 and a nonoperation position where it does not reach the groove 14. The fixing pin 15 is engaged with one of the positioning holes 11 in the disk 10 to fix the disk 10, and the polychromatic developing device 3 is fixed at a specific rotational angle position. Consequently, the position of the developing device becomes stable and excellent copy picture quality is obtained. |
