Apparatus for forming a supply coil from a thread supplied from a yarn stock

Claim 1

Apparatus for forming a supply coil from a thread supplied from a yarn stock, said apparatus comprising a stationary yarn winding drum having a radially fixed part with a winding surface and a radially adjustable part with a winding surface, winding arm means rotatable with respect to the drum for forming a yarn coil on the drum, and pin means within the drum engaging the windings of the formed yarn coil on the drum to move the yarn coil axially along the drum, the radially adjustable part of the drum including means for adjusting the effective diameter of the drum corresponding to the desired yarn length of the yarn coil formed by the winding arm means on the drum, wherein the radially adjustable part comprises at least one axially directed rib, which is mounted radially adjustable from the winding surface of the fixed part, and wherein the fixed part of the drum is constituted by a substantially cylindrical housing which is arranged excentrically with respect to the axis of the winding arm means, whereas the radially adjustable drum part is constituted by a number of ribs shaped as parts bent substantially to L-shape which each are radially directed with one leg and are connected to the cylindrical housing adjustable in radial direction and with the other leg are directed axially according to the generatrices of the winding drum.