A YARN TENSION SENSOR WITH IMPROVED CALIBRATION, A YARN FEEDER AND A METHOD OF CALIBRATING A YARN TENSION SENSOR

摘要

This invention relates to a yarn tension sensor (5) with improved calibrations for detecting the tension of a moving yarn (7), particularly in knitting machines, comprising: a yarn feeler element (21), which is disposed in a yarn travel path and has a bearing face for the yarn (7), a yarn takeup device (41), which at least can be positioned in contact with the yarn (7) or is in permanent contact with the yarn; a measuring device (5), connected to the yarn feeler element (21), for detecting the force exerted by the yarn (7) on the yarn feeler element (21), and an actuator device (48), by means of which the yarn feeler element (21) and the yarn take up device(41) are movable relative to one another between a calibration position and a measurement position in such a way that in the calibration position, the yarn does not rest on the yarn feeler element (21), and in the measurement position, the yarn does rest on the yarn feeler element (21). The invention also pertains to a yarn feeder (1) for knitting machines comprising a yarn tension sensor a yarn feed wheel (4) and a calibration device (40) for the yarn tension sensor (5). A method for calibrating the yarn tension sensor (5) has also been disclosed.