| 摘要 |
<p>PURPOSE: To provide a covered thread production apparatus in which the control circuit of the spindle motor drives each of roll motors, each of continual drawing rolls is controlled electrically by each roll motor, and it works at a speed proportional to the speed of a binder spindle. CONSTITUTION: A conduction motor 13 is driven by the output signal from a variable frequency oscillator 51 via a power amplifier 53, and the output signal from a tachometer pulls oscillator 55 is fed to a pre-counter 57. By the signals from an oscillator 55 adjusted with the counter 57, pulls speed counters 65-67 are driven, step motor driving circuits 61-63 are controlled, and rolls 21, 23 and 26 are driven by step motors 29, 39 and 43, respectively.</p> |
