| 摘要 |
PURPOSE:To see the label of a record disk at a correct position all the time by driving a motor stepwise continuously from some point in time before a turntable reaches its initial position and by stopping it at the initial position. CONSTITUTION:When a start switch 14 is pushed, an FF13 operates a control circuit 12 to change switch circuits 11a and 11b over to fixed-contact N sides, and a servo circuit 3 and a motor driving circuit 4 drives a turntable at a constant rotational frequency through a motor 1. With a stop switch 15, an FF13 operates the circuit 12 to change the circuits 11a and 11b over to fixed-contact S sides and 90 deg. out-of-phase pulse signals from a driving pulse generating circuit 20 are supplied to coils 5a and 5b of the motor 1, driving the motor 1 stepwise. Once a final pulse at the point of time when the switch 15 is pushed is counted 17, a single-rotation signal from a decoder 18 stops the operation of a transmitting circuit 19, and a record on the turntable is stopped so that its level position is corrected. |
