| 摘要 |
<p>PURPOSE:To prevent a reverse rotation of a tape running and an excessive tension by providing a tension control circuit, a speed control circuit during running a tape at high speed by a reel motor, and a transition control circuit when moving from the high speed tape running by the reel motor to a tape running by a capstan motor. CONSTITUTION:The time T (= constant) from a high speed tape running until the tape is stopped once is set. Further, in order to take the winding diameter of the tape into consideration, after a start of a stopping interval, a time constant corresponding to a low velocity of a reel motor is decided by a retrigger monostable multivibrator and a take up side reel encoder is trigger inputted, thereby the variable information tau is obtained. In a take-up reel motor, an optimum control voltage by a division ratio of resistances R2, R3 is set, in a feeder reel motor, an optimum control voltage obtained by adding a control voltage according to the division ratio of resistances R4, R5 and the control voltage according to the division ratio of the resistances R6, R7 is set. When the running of the tape is substantially stopped, (after the stopping interval T) the pinch roller is attached.</p> |
