| 摘要 |
A mechanical device for advancing a strand between two rotatable sheaves where the facing sides of the sheaves are provided with teeth. The sheaves are mounted on separate axis and are tilted toward each other. This tilting allows the teeth of the two sheaves to engage with each other at one side and to disengage with a gap between themselves on the opposite side of the two disks. The strand is laid in the gap portion between the two sheaves and is wrapped in circular configuration between the teeth portion in undulated shape. The downstream portion of the wrapped strand is released by the teeth of the two sheaves in the gap portion and can be effortlessly be withdrawn from the sheaves.
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