| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep the tape tension constant by controlling a reel motor of the take-up side by feeding back so as to keep the tape tension constant which is figured out from a current value of the reel motor at the take-up side. SOLUTION: In a control circuit 8, the detected current value I is divided by the tape winding diameter Rt and this value is defined to the feedback amount and compared with a controlling objective value E preliminarily set so that the tape tension Tt becomes the desired value. When the feedback amount <E, a driving voltage of the supply side reel motor 4 in the forward direction is lowered. When the feedback amount >E, a load due to a reel base 4 at the supply side is increased/decreased by controlling to increase the driving voltage of the supply side reel motor 4, and as the result, by the operation to increase/decrease the tension Ts at the position right after the supply side reel base 3, the tension Tt at the position before the take-up side reel base 1 is kept constant independently of the tape winding position.</p> |
