Patent ID: 8305015

Claim:
A system ( 1 ) for controlling at least the tension in a yarn or a metal wire during the feed of said yarn or said metal wire to a textile machine or coil winder or a similar machine operating on a metal wire, said yarn or wire unwinding from its own spool and cooperating with a rotary member associated with its own rotation actuator ( 2 ) before being directed to said machine, said yarn or wire having its own characteristic value of tension during this feed, said rotation actuator ( 2 ) comprising a stator and a rotor acting on an exit drive shaft ( 13 ) and being piloted by its own piloting means, said rotary member about which said yarn or wire winds being keyed onto the exit drive shaft ( 13 ), said control system comprising: means ( 4 ) for continuously measuring an angular position of said drive shaft ( 13 ) of said actuator ( 2 ), sensor means (SE) situated downstream of said rotary member in cooperation with said drive shaft angular position measurement means ( 4 ) for generating a signal (S 1 ) representing at least the tension in the yarn or wire during the feed based on the measurement of the angular position of the drive shaft ( 13 ); comparison and command means ( 5 , 8 ) connected downstream of said measurement means ( 4 ), to compare an instantaneous parameter corresponding to an instantaneous tension in the yarn or wire which is correlated to said measured angular position of said drive shaft ( 13 ), with a predetermined parameter relative to a prefixed characteristic value of tension of said yarn or wire, and to feed command signals to piloting means ( 3 , 6 ) for said actuator ( 2 ) such that said instantaneous tension parameter conforms to said predetermined tension parameter, so as to obtain the required characteristic value of said tension of said yarn or wire being fed to said machine.