Device for measuring the tensile force on a thread
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United States of America Patent
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Jul 26, 1988
Grant Date -
N/A
app pub date -
Feb 25, 1986
filing date -
Feb 26, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for measuring the tensile force on a thread includes a housing having thread guides at the points of inlet and outlet of the thread. A spring plate is mounted on the housing intermediate the thread guides and has a dumbbell-shaped guide member at its end for engaging the thread. The spring plate is so mounted that the tension on the thread displaces the spring plate from its initial unflexed position. Adjacent the guide member on the movable spring plate is a permanent magnet which moves with the spring plate as it displaces. A sensor employing the Hall effect is fixed to the housing at a given distance from the magnet. Movements by the magnet are detected by the Hall sensor, which produces an output signal indicative of the displacement of the spring plate, which signal is processed to give an indication of the thread tension.
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