| 摘要 |
<p>PURPOSE:To decrease the roll-in quantity at the time of a tape sticking accident by providing a threading completion detecting means, and setting a rotating speed to a smaller value than a play mode equivalent value until tape threading is completed. CONSTITUTION:A system controller 5 sends a servo-clock signal for instructing the speed of revolution to a drum servo-circuit 2, and allows a drum motor 1 to start to the prescribed speed of revolution. A servo-clock signal given at the time of starting this tape threading is set to a small value than a play mode equivalent value. Subsequently, when tape threading is completed, it is detected by a threading completion detecting circuit 4, and a completion signal is sent to the controller 5. As a result, the controller 5 sends a servo-clock signal corresponding to a normal speed of revolution to the circuit 2, and the motor 1 executes a normal rotation. In such a way, it rotates at a low speed in the course of a threading period, therefore, even if a tape sticking accident is generated, the roll-in quantity of a tape can be decreased.</p> |
