Ribbon breaking for high speed surface driven winders

Claim 1

In a method of winding a cylindrical substantially flat-ended yarn package on a surface driven winder in layers of helical coils of yarn by forwarding yarn at a substantially constant speed, rotating the package at a substantially constant peripheral speed, and traversing the yarn back and forth across the package at a varying speed by a cam drive with a traverse motor with an inverter having the electrical output frequency modulated from a predetermined rate, the improvement comprising varying said speed of said traverse by constantly varying said predetermined rate of the inverter electrical output in a nonlinear major modulated waveform while constantly maintaining said frequency modulation from said predetermined rate, resulting in a plot of frequency of said inverter electrical output versus time which can be described as a minor modulated waveform continuously superimposed within a major modulated waveform, said minor modulated waveform having an amplitude of about 1 to 6 percent of the predetermined rate, said major modulated waveform having an amplitude of about 2 to 12 percent of the predetermined rate, said minor modulated waveform having a period of about 0.5 to 5 seconds, said major modulated waveform having a period of about 0.25 to 2.0 minutes, and the amplitude of the minor modulated waveform being less than onehalf the amplitude of the major modulated waveform, so that ribbons are prevented in said package, and so that no simultaneous modulated drive roll speed to coincide with the modulated traversal rate is needed.