| 摘要 |
PURPOSE:To detect securely the break state of a clutch mechanism and to eliminate the need to adjust the operation point of a microswitch, by detecting the period of oscillation pulses of a rotary encoder exceeding a specific time while the lock part of a clutch lever disengages from the locked part of a clutch ring, and putting a moving body reciprocal driving means in operation. CONSTITUTION:A pulley 72 where a wire 57 is extended and a rotary encoder 72 are provided on the shaft 71 of a rotary motor 70 to rotate in one body. When the period of oscillation pulses generated by the rotary encoder 73 exceeds the specific time, disengagement is judged and detected. When said period is denoted as T during the equal velocity motion of an optical scanning system, the point of time when the period exceeds, for example, 2T is detected as a disengagement point. Then, the return motor 70 is rotated at this point of time to move the optical scanning system forth and back without locking the driving system of the optical scanning system. |
