| 摘要 |
PURPOSE:To enable a dancer-roll to be made rapidly following the preliminarily fixed tension by a method wherein the going up and down speed of a dancer-roll is detected and this detected signal is fed back to the speed controller of a bridle. CONSTITUTION:A detector 16 for the going up and down speed of a dancer-roll is installed, the detected signal from said detector 16 is fed to a null-control device 17 for going up and down speed of said dancer-roll, and so the signal is fed back to a speed controller 10 of a bridle. By this constitution, the going up and down of said dancer-roll 3 is enabled to be smoothed and the transmission of variation of tension from outside or the variation of tension at acceleration or deceleration can be eliminated, and therefore said dancer-roll 3 is enabled to be made rapidly following the preliminarily fixed tension. |
