| 摘要 |
<p>PURPOSE:To increase the speed of a tape at the time of searching by changing the rotating speed of a reel driven only by switching operation to a rotating speed preset in advance. CONSTITUTION:When the search in the FF direction begins by a command from a CPU, the circuit constant of a servo amplifier 17 is set and the output of a driver 16 is controlled. A take-up reel 11 is rotated by a reel motor 12 and a generated FG is detected by a detector 13. The rectangular wave output is converted to a voltage output by means of an F/V converter 14 and fedback to an amplifier 17. At this time, a supplying reel 22 rotates while keeping the tape tension constant and generates an FG. The FG is detected by an FG detector 23 and a voltage according to the FG frequency is outputted through an F/V converter 24. The output is fed back to the amplifier 17. On the other hand, the outputs of converters 14, 24 are compared by a comparator 15, a changeover circuit 18 for rotating speed is switched according to the L or H of the difference of the outputs, the constant of the amplifier 17 is changed and the motor 12 is rotated at a first or a second rotating speed.</p> |
