Ribbon breaking method and apparatus
AssigneeMonsanto Company
InventorEgidio Guelpa
Life of this patent
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Abstract
Random doffing of a multiple-position winding machine is permitted by beginning yarn package formation at a high mean yarn traverse frequency provided by a first inverter, then shifting to a low mean modulated traverse frequency provided by a second inverter for further package formation. The output frequencies of the two inverters are controlled to be substantially identical at the time of transfer.
Claims6
A process for controlling a plurality of yarn traversing mechanisms, each of said traversing mechanism controlling the winding of a corresponding yarn package, comprising:
- (a) independently connecting each of said traversing mechanisms to a first source of first alternating current having a first mean frequency during winding of a first portion of the corresponding yarn package controlled by each said traversing mechanism;
- and
- (b) independently switching each of said traversing mechanisms to a second source of second alternating current having a mean frequency lower than said first mean frequency during winding of a further portion of the corresponding yarn package controlled by each said traversing mechanism.
A ribbon-breaking apparatus for a multiple-position winding machine comprising, in combination:
- (a) a first inverter providing an output frequency having a first mean value;
- (b) a plurality of A.C. motors, each of said motors being coupled to drive a yarn traverse mechanism;
- (c) means for independently connecting each of said motors to the output of said first inverter;
- (d) a second inverter;
- (e) modulator means for modulating the output frequency of said second inverter about a second mean value lower than said first mean value and between upper and lower frequencies;
- (f) said modulator means being constructed and arranged such that said output frequencies are periodically substantially identical to provide time intervals for bumpless transfer of said motors;
- and
- (g) means for independently switching each of said motors from the output of said first inverter to the output of said second inverter during said time intervals.
Dependencies are inferred from the claim text.