| 摘要 |
Equipment for continuously measuring the length of an endless material, such as a yarn, which is being wound up on a machine into a circular package, the machine comprising a movable member whose position depends upon the diameter of the package. The measuring equipment comprises a movable transfer member mechanically coupled to the movable member of the machine, and therewith cooperating photoelectrical sensing means for generating a sensing signal indicative of the position of the movable member at each revolution of the package. There is further provided electronic circuitry for continuously evaluating consecutive sensing signals and generating therefrom a digital signal representative of the length of the yarn wound up into the package.
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