which has a relatively dense surface has proven advantageous the amount of lubricant therein can amount to more than 50 of the volume of the support it may consist of flexible material but should be as resistant as possible to wear as already mentioned the greatest pressure on the reed teeth 12 is necessary for the beating up of the filing thread it is most advantageous for the groove 24 to be arranged directly in front of the point of greatest pressure in the embodiment shown in fig2 and 3 the reed tooth 12 rests against the screw shaft 13 in the region 25 when the beating up of the thread takes place with the direction of rotation indicated by 21 the groove 24 containing the lubricant is accordingly somewhat in front of this region 25 whereby the lubricant is transferred upon each revolution from the groove 24 to the reed tooth 12 and from the reed tooth to the region of action 25 in fig4 and 5 the screw shaft 14 is shown over a metal center 26 there is arranged a jacket 27 of plastic having the profile 16 in the groove there is similarly present a holder or holder means impregnated with a lubricant said holder advantageously also being in the shape of a wick like structure in the case of the.