| 摘要 |
A device for adjusting gram force applied to a thread in knitting machines, comprising a control unit that is adapted to drive a power supply device of a motor for unwinding a thread to be fed to the knitting machine, a gram force sensor adapted to detect the gram force applied to the thread and to emit a gram force signal, a comparator adapted to compare the gram force signal with a reference signal in order to obtain a gram force error signal; the control unit comprises elements adapted to emit a signal for driving the power supply device of the motor according to the gram force error signal of the thread and to a signal that is the derivative with respect to time of the gram force signal emitted by the gram force sensor.
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