cap these elements engaging the outcoming yarn about a circumferential area of the cap having a slightly smaller diameter than that of the winding drum of the feeding device application_number US 31175281 A description fig1 illustrates a feeding device which comprises inside a casing 1 an electric driving motor and an electronic control circuit not shown as well as a winding arm 2 and externally a cylindrical body 3 or drum for winding the yarn 4 means 5 for detecting the amount of yarn wound on the body 3 magnetic means 6 for preventing the rotation of the body 3 and means 7 for braking the outcoming yarn 4 partially inside the casing 1 and partially on the outside thereof a disc 8 is provided to lead forward the yarn turns winding on the body 3 the winding arm 2 consists of an inclined extension with bent end of the shaft 9 of the electric driving motor said shaft 9 and said arm 2 being hollow for the yarn 4 to slide therein on the shaft 9 is moreover mounted freely rotating on bearings the cylindrical body or winding drum 3 which is prevented from rotating by the pair of magnets 6 one fixedly connected to the casing 1 and the other carried by said body 3 according to the invention the braking means 7 comprise a.