such beads 17 and 22 in the longitudinal direction of the spun yarn 14 this has the beneficial effect that the spun yarn 14 possesses in the region of the beads or ridges 17 and 22 a higher s shape twist level or degree of twist than the twist produced by the rotation of the spinning rotor 12 accordingly a twist block is formed in the region of the beads or ridges 17 and 22 this twist block disappears however after the spun yarn 14 has moved beyond the beads or ridges 17 and 22 thus the spun yarn 14 possesses an increased strength in the regions in which the spun yarn is deflected and in which regions the spun yarn 14 is exposed to greatest stresses during the open end spinning operation the aforedescribed formation of a twist block or blockage by means of the inclined disposition of the beads or ridges 17 and 22 in substantially the same direction as the twist direction b of the spun yarn 14 is an essential characteristic or aspect of the present invention and of eminent significance for achieving the initially mentioned advantages of the inventive open end spinning device 1 in an advantageous embodiment as already noted hereinbefore the substantially funnel shaped withdrawal nozzle 16 and the substantially spiral shaped bead or ridge 17 are made of a ceramic material such funnel shaped withdrawal nozzle 16 can be manufactured at low cost if the withdrawal nozzle 16 is formed in such a manner that the ceramic material to be baked is placed in a basic mold and the portion containing the bead or ridge 17 and tubular portion 19.