YARN FEEDER OF STORAGE TYPE WITH MAGNETIC BRAKE

摘要

The yarn (18) feeder (10; 10A) for textile applications of storage type comprises: a body (12) carrying a drum (16) on which turns (20) of yarn (18) originating from a spool are wound; a braking member (22) of the type using magnets (30 36 38); a tension sensor (24) for measuring the tension value of the exiting yarn (18) the braking member (22) comprising a first permanent magnet (30) and a fixed second magnet regulator means (38; 39) for varying the action exerted by the second magnet (36; 38) on the first permanent magnet (30) and a control unit (26) which controls the regulator means. The first magnet is annular and movable parallel to the axis of the drum (16) and along it between a first position (30A) in which the first permanent magnet (30) enables the yarn (18) to be pressed against a counteracting element (32) fixed to the drum and a second position (30B) in which this effect does not occur the control unit receiving the tension values measured by the tension sensor (24) comparing them with a predetermined value and intervening in real time on said regulator means (38; 39) to adjust the tension value to the predetermined value when these two values do not coincide.