Abstract: A fiber opening device of the spinning unit of an openend rotor spinning machine, for avoiding misalignments in the connection between the front end of the sucking tube of a travelling automatic service unit and the inlet port of the spinning unit, in order to prevent false air from being sucked in at this contact point. According to the invention, a sucking tube is provided with a self-adjustable sealing head having a front sealing surface to be fitted onto the front wall of the spinning unit. In the inner space of the sealing head a partially spherical concave surface fitted onto a mating, partially spherical convex surface provided at the end of the said sucking tube.

Abstract: A single-step stable method of producing spun-twisted yarns. A twist point is located on the frictional surface of a take-off funnel of the spinning rotor. A strand material which forms a component of the final spun-twisted yarn product is exposed, between feed rollers and said twist point, to an appropriate combination of transport effects of a pneumatic field of force and a mechanical field of force. For this purpose, the tube, through which the strand material is supplied, is determined in dependence on the pneumatic conditions prevailing in the spinning rotor.

Abstract: Method of and apparatus for compensating for weft tension in the region between a fabric selvedge and weft thread spooling units in traveling wave shedding looms wherein the spooling units follow an endless path of which one portion extends in common with another endless path followed by weft thread inserters containing a weft supply package, said weft tension compensation taking place after the respective weft thread spooling unit and the weft thread inserter have left each other and after the latter has entered a weaving shed as well as after the weft thread has been woven into the fabric fell, up to the instant at which the weft thread has been severed adjacent the fabric selvedge, the weft thread withdrawal from the spooling unit being blocked upstream the point of divergence of said respective paths of the weft thread spooling units and the weft thread inserters.