Yarn tension sensor with improved calibration

Winding – tensioning – or guiding – Tension control or brake – Supply controlled

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Details

2424181, 226 45, B65H 2306, B65H 5902, B65H 7700, B65H 2318, B65H 5918

Patent

active

061058955

ABSTRACT:
A yarn feeder intended particularly for flatbed knitting machines and elastic yarns has a yarn tension sensor which is provided with a calibration device. This device lifts the yarn from a peg that is part of the yarn tension sensor, at times in which this can be done without impairing operation of the yarn feeder. Such times are preferably time slots when no yarn feeding is necessary. Once the yarn has been lifted from the peg, a zero point calibration is performed. Zero point drifting of the entire sensor system, including its measurement circuit, can be detected and compensated for.

REFERENCES:
patent: 3578795 (1971-05-01), Polese
patent: 3807612 (1974-04-01), Eggert
patent: 3858416 (1975-01-01), White et al.
patent: 4347993 (1982-09-01), Leonard

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