| 摘要 |
Belt tensioner comprising a support, a roller designed to be in contact with the belt to be tensioned, a roller carrier on which the roller is mounted rotationally and which is mounted on the support so as to move back and forth between two extreme positions, a spring arranged between the support and the roller carrier in such a way as to urge the roller carrier continuously from a first to a second of the two extreme positions, a two-way switch mounted on the support in such a way as to be actuated by the roller carrier to occupy a first state only when the roller carrier is at the first extreme position and to pass into the second state when the roller carrier has left this first extreme position under the action of the spring, and means for mounting the support on a base so that the roller carrier occupies the first extreme position only when the belt is intact and has a predetermined tension.
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