| 摘要 |
<p>PURPOSE:To attain the stable drive of a tape and to prevent the damage of the tape edge part by tilting a post via an actuator with the detecting output of a sensor which detects the up-down movements of the tape and controlling the up-down positions of the tape. CONSTITUTION:A tape 3 rubs the outer circumferential surface of a post 1. A piezoelectric element 2 warps when it receives the DC voltage. As a result, the post 1 fixed at a single end part 2a is tilted. In case the tape 3 moves up and down from its prescribed reference position, a sensor detects the shift extent of the tape 3. Then the element 2 is curved in response to the detecting output of the sensor. Thus the post 1 is tilted in an optional direction at an optional angle. Then the tape 3 is moved up and down and the up-down position of the tape 3 is controlled.</p> |
