wall 17 of covering element 16 the thrust of the brake body 20 transferred by braking rim 23 onto inner wall 17 is internal to the conical spiral path formed by the weft yarn 14 and is directed toward the center of the spiral according to the direction of the movement of the weft yarn 14 in a diameter smaller than the outer diameter of storing drum 12 this allows that the inertia of the weft yarn 14 forms angles e g when passing through the braking zone differing in function of the weft yarn speed and of the axial position of the braking zone or contact zone between the brake body braking rim 23 and inner wall 17 upstream said braking zone the weft yarn 14 is free to move as necessary along its spiral path and with rotation about the axis of storing drum 12 however covering element 16 there fulfills a balloon limiting function as well as downstream of said braking zone in fig1 the weft yarn 14 unwinding according to the above mentioned cone shaped spiral pattern is shown as running with a slight distance from the inner wall 17 of covering element 16 however the weft yarn 14 then apparently will be pushed by the edge or braking rim 23 of front head 24 of brake body 20 in the direction towards inner wall 17 brake body 20 therefore is acting.