Elastic Yarns Winding Machine is offered with “on-line” tension control system. The Winding Machine is capable of providing a low density package that is a perfect preparatory solution to the dye elastic yarns. The Winding Machine keeps a high residual elasticity percentage of the elasticized yarn. The Elastic Yarns Winding Machine is offered with the features of obtaining qualitative results quite similar to hank dyeing but with the same simplicity and economy typical of yarn package dyeing.