Abstract: In pneumatic feeding of fibers (20) to the fiber collection surface of an open-end spinning element, the air which circles together with the opener roller (10) and is conveyed past the inlet opening (40) of the fiber feeding channel (4) is fed back to the fiber feeding channel (4). In this process, the air is conveyed in the circumferential area of the housing (1) between the inlet opening (40) of the fiber feeding channel (4) and the feeding point (21) of the fiber sliver (2) to the opener roller (10) to at least one end of the opener roller (10) and is then fed back along this (at least one) end of the opener roller (10) to the inlet area of the fiber feeding channel (4).

Abstract: The instant invention relates to a spinning process and to a device for the production of a yarn. In the spinning process the fibers are conveyed to a perforated collection surface which is subjected to suction in one zone. They are brought together into a fiber accumulation on the collection surface. The fiber accumulation is drawn off from the collection surface and twisted into a yarn of predetermined twist in a twisting element which follows the collection surface in the direction of yarn draw-off. The fibers are accumulated at a suction edge constituting a collection line and are pre-twisted at said collection line.

Abstract: The present invention relates to a spinning process and device for the production of yarn. Fibers are conveyed through a feeding channel from an opening roller and deposited onto a perforated collection surface, such as a perforated roll or disk, which is subjected to suction in at least one zone. The fibers are oriented on the collection surface along a main sense of orientation of the perforations. The fibers are conveyed through the suction zone and formed into a fiber accumulation along a collection line. A suction insert is included generally beneath the perforated collection surface and defines the suction zone and collection line for the fibers. The fibers forming into a fiber accumulation along the collection line are pre-twisted along the collection line. A separate twisting element independent from the collection surface is provided downstream from the collection surface and provides a final pre-twist to yarn drawn off of the collection surface.

Abstract: An apparatus for making a doubled yarn draws a core yarn off a core-yarn supply, pulls the core yarn longitudinally in a travel direction along a yarn path, and drafts the core yarn longitudinally along this path. A tube through which the yarn passes longitudinally extends along the path downstream of the drafting station has relative to the yarn-travel direction an upstream portion and a downstream portion. A current of air is passed longitudinally in the travel direction through the upstream tube portion and another current is passed longitudinally opposite the travel direction through the downstream portion. Thus upstanding fibers are first laid against the core yarn to be integrated into it as same twists in the upstream tube portion and any remaining fibers are laid back against it so that a winder yarn can be wound around the core yarn immediately downstream of the tube to bind in these fibers too.