| 摘要 |
Apparatus for maintaining constant tension in wire travelling between two driven rolls, one of which delivers the wire; the other being a take-up roll. The apparatus comprises a detector system actuated by the wire while the wire travels in a straight path between the rolls. The detector system comprises a deflector pulley which deflects a portion of the travelling wire from the straight path and a return pulley which returns it thereto. The return pulley is movable toward or away from the deflector pulley in response to tension variations in the wire. A detector detects the variations in distance between the detector pulleys and produces a corrective signal. This signal is used to vary the speed of one of the two driven rolls, in a direction and to an extent responsive to the variation of said distance, thereby keeping the tension of the wire constant between the driven rolls. |
