Method and means for regulating sliver draft uniformity

Textiles: fiber preparation – Working – Drafting

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57 81, D01H 542

Patent

active

041998448

ABSTRACT:
The draft imparted to sliver during regular operation of a sliver drafting apparatus is correctively varied in proportion to uniformity variations then detected in the sliver. During at least part of each period of start-up of the apparatus, the sliver is subjected to a prescribed correction draft approximately equal to an average of the draft corrections applied to the sliver over a relatively long time interval during the last-ensuing regular operation of the apparatus. During that initial part of each start-up period required for the apparatus to accelerate to substantially full operating speed, the prescribed correction draft is either not applied or, alternatively, is scaled in proportion to the speed of the apparatus. Preferably the correction draft applied to the sliver during transition from start-up to regular operation of the apparatus is approximately equal to the sum of the prescribed correction draft applied during the start-up period, and any additional correction draft resulting from uniformity variations then detected in the sliver.

REFERENCES:
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patent: 3435673 (1969-04-01), Felix
patent: 3673591 (1972-01-01), Schwartz
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patent: 4109450 (1978-08-01), Yoshida
Platt Saco Lowell Instruction Manual, 1st Edition, Versamatic Model DF Type 746, 7-77.

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