| 摘要 |
<p>PURPOSE:To drive a tape in consideration of the influence of the mechanical load produced between reels or the tape load by controlling a servo circuit so as to keep a constant level of the counter electromotive force that is produced when one of a pair of reel motors is driven by the other one. CONSTITUTION:A take-up side supply reel motor 1 is used together with a supply side reel motor 2, a servo circuit 3 which controls the drive of the motor 1, a detecting circuit 4, and a switch circuit 5 which connects with switch the circuit 4 to the motor 2 and the circuit 3 to the motor 1 in accordance with the tape traveling direction. In such a constitution, the motor 2 is revolved via a tape in response to the drive of the motor 1. In this case, the counter electromotive force, i.e., the torque is produced and detected by the circuit 4. Then the drive of the motor 1 is controlled so that the voltage and the torque are kept at a constant level respectively. Thus it is possible to reduce the influence of the mechanical load produced between both reels or the tape load.</p> |
