| 摘要 |
<p>PURPOSE:To realize a quick operation such as a solenoid system and also a soft contact of a head to the surface of a magnetic tape, by moving a plate on which the head has been loaded, through an exclusive motor whose speed is controlled. CONSTITUTION:A pulse is generated from a position detecting switch element 1 and is applied to a CPU, through a plate of a shielding plate 9 which turns by interlocking with an exclusive motor 4 for moving a plate on which a head has been loaded. In accordance with the number of generation of this pulse, the CPU2 controls a switching circuit 3, controls the motor 4 in accordance with modes of quick forwarding, recording, reproducing, etc., and stops the head at a prescribed position. On the other hand, at the time of recording and reproducing modes, etc., the present head position is detected by a roller through a cam 8 which is interlocked with the motor 4 and is turned, and when the number of brush current pulses through a resistance S reaches a necessary value, the motor 4 is set to a low speed by the CPU2 and the circuit 3, and the head softly contacts with the surface of a tape.</p> |
