Patent ID: 6094945
Filing Date: 2000-08-01
Classification: D04B

Abstract:
A device for feeding an elastically extendable yarn to hosiery knitting machines, comprising:at least one positive yarn feeder composed of two mutually opposite contrarotating rollers which have parallel axes, between which a yarn to be fed passes;means for rotationally actuating at least one of said rollers about its own axis with a rotation rate which can vary on command;detector means arranged downstream of said positive feeder along the yarn feed direction for detecting the tension of the yarn; anda programmable control and monitoring unit which is operatively connected to said detector means for comparing the tension of the yarn detected by said detector means with a first preset yarn tension which is preset in said control and monitoring unit, said control and monitoring unit being also operatively connected to said actuation means in order to vary the rotation rate of said at least one roller of the positive feeder in order to maintain within a preset tolerance range the difference between the detected yarn tension and the first preset yarn tension.