| 摘要 |
Tensioning apparatus for maintaining one or more strands under substantially constant tension during pay out includes a let-off stand for each spool of strand material and a pivotally mounted dancer bar having a dancer roll thereon engaging the strand material. A tension load is applied to the dancer bar which controls the amount of braking force applied to each spool. Should the pulling force on the strand material increase, the dancer bar automatically moves to a position causing a reduction in the braking force, whereas should there be a reduction in the pulling force, the dancer bar automatically moves to a position causing an increase in the braking force thus to maintain a substantially constant tension on the strand material. Where plural strands are being payed out at the same time, the tension in all of the strands may be controlled as a group by providing a single load tensioning device for all of the dancer bars in the group.
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