Patent ID: 7721574

Claim:
A yarn-recovering device arrangeable upstream of a textile machine for temporarily recovering a length of yarn previously fed to the machine and for returning it subsequently, comprising a motorized reel having a substantially axial inlet port and an outlet port on a lateral surface thereof, with a passage for the yarn formed within the reel between said ports, said reel being operatable to rotate from a resting configuration, in which the reel is kept still, to an active, yarn-recovering configuration, in which the reel is driven in one direction for winding the yarn on itself and recovering it from the machine, to a subsequent active, yarn-unwinding configuration, in which it is driven in the opposite direction for unwinding the yarn from itself and returning it to the machine, wherein it is controlled by a position control system comprising a position sensor arranged to measure a position of the reel and to send a corresponding measured position signal to a position control loop, which compares said measured position signal with a reference position signal corresponding to a desired position for the motorized reel, and drives the reel in such a way as to minimize a difference between the measured position and the desired position.