| 摘要 |
A strand tension apparatus, including a strand delivery mechanism (63) for controllably delivering a moving strand under tension downstream from a strand supply, a strand take-up mechanism (65) positioned downstream from the strand delivery mechanism (63) for pulling the strand (3) from the strand supply (63), and a tension controller (T) positioned between the strand delivery mechanism (63) and the strand take-up mechanism (65) for adding tension to the moving strand as it moves downstream from the strand delivery mechanism (63) to the strand take-up mechanism (65). The tension controller includes a rotating strand feeding device (9) frictionally-engaging the strand (3) and a variable drag force-applying device (8, 17, 25) cooperating with the rotating strand feeding device for adding a predetermined tension to the strand (3) as the strand (3) is delivered downstream from the strand delivery mechanism (63). A tension responsive drag-force varying device (8, 17, 25) cooperates with the drag-force applying device and is responsive to the tension on the strand (3) being delivered from the strand delivery mechanism (63) for reducing the amount of drag added to the strand by the drag-force applying device by a value resulting in delivery of a strand (3) under uniform tension downstream from the tension controller to the take-up mechanism (65).
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