Thread wrapping apparatus

Apparatus for forming a wrapped thread from a fiber supply, said apparatus comprising:

• a binder spindle;
• a variable speed induction motor for driving said binder spindle at a preselectable speed;
• a first control circuit means, including a variable oscillator, and an amplifier driven by said oscillator to provide to said induction motor alternating current at the operating frequency of said oscillator for operating said spindle motor means at a speed corresponding to the operating frequency of said oscillator;
• tachometer means driven by said spindle for generating a pulsatile signal at a frequency corresponding to the operating speed of said spindle;
• first, second and third sets of rolls for drawing said fiber, said third set of rolls having a pair of rolls downstream of said spindle;
• a stepper motor means for each of said sets of rolls for driving the respective set of rolls at a respective preselectable speed;
• and
• respective frequency scaler circuit means, driven from said pulsatile signal, for providing to each respective stepper motor a step signal which is an individually preselectable proportion of the frequency of said pulsatile signal.

Apparatus for forming wrapped thread from a fiber supply, said apparatus comprising:

• a plurality of wrapping stations each of which includes,
• a binder spindle,
• spindle motor means for driving said binder spindle at a preselectable speed,
• first, second and third sets of rolls for drawing said fiber, said third set of rolls having a pair of rolls downstream of said spindle,
• a roll motor means for each of said sets of rolls for driving the respective set of rolls at a respective preselectable speed, and
• respective control circuit means for operating each of said roll motor means at a respective speed which is an individually preselectable proportion of the speed of said spindle motor,
• said apparatus further comprising:
• a first control circuit means, including a variable oscillator, for operating a plurality of said spindle motor means at a speed corresponding to the operating frequency of said oscillator;
• a second control circuit means, including a second variable oscillator, for operating at least one of said spindle motor means at a speed corresponding to the operating frequency of said second oscillator;
• and
• respective switching means for connecting each of said spindle motor means to either said first control circuit means or said second control circuit means.

Apparatus for forming wrapped thread from a fiber supply, said apparatus comprising:

• a plurality of wrapping stations each of which includes,
• a binder spindle,
• spindle motor means for driving said binder spindle at a preselectable speed,
• tachometer means driven by each spindle for generating a pulsatile signal at a frequency corresponding to the operating speed of the respective spindle,
• first, second and third sets of rolls for drawing said fiber, said third set of rolls having a pair of rolls downstream of said spindle,
• a stepper motor means for each of said sets of rolls for driving the respective set of rolls at a respective preselectable speed, and
• respective frequency scalar circuit means, driven from the respective pulsatile signal, for operating each of said roll motor means at a respective speed which is an individually preselectable proportion of the speed of the respective spindle,
• said apparatus further comprising:
• a first control circuit means, including a variable oscillator, for operating a plurality of said spindle motor means at a speed corresponding to the operating frequency of said oscillator;
• a second control circuit means, including a second variable oscillator, for operating at least one of said spindle motor means at a speed corresponding to the operating frequency of said second oscillator;
• and
• respective switching means for connecting each of said spindle motor means to either said first control circuit means or said second control circuit means.