Patent DE-19828842-A1 (DE)
Title: Open-end spinning apparatus to spin twisted yarns
Inventor: THIERRON WOLFGANG
IPC: D01H4/08
Filed: 1998-06-27
Abstract: During open-end spinning, the separated fibers are passed to a static collection groove. The compressed air feed moves the fibers in relation to the groove, in the peripheral direction, to be compressed into a sliver, which is moved continuously to be bonded into the end of the spun yarn taken out of the spinner. During open-end spinning, the separated fibers are passed to a static collection groove. The compressed air feed moves the fibers in relation to the groove, in the peripheral direction, to be compressed into a sliver, which is moved continuously to be bonded into the end of the spun yarn taken out of the spinner. The fiber compression into a sliver is reinforced by a movement component in the compressed air flow which is aligned at the base of the fiber collection groove. The separated fibers are fed to a static fiber sliding surface, to be moved by an air flow in the peripheral direction before they reach the fiber collection groove. The air flow is intensified, to carry the fibers along the sliding surface. The friction of the groove surface in relation to the compressed sliver is less than at the fiber collection groove for the separated fibers. An Independent claim is included for an open-end spinner with a static spinning chamber (1) to form the yarn twisting chamber. It has a ring-shaped fiber collection groove (10), with at least one compressed air channel (62,63) aligned in the peripheral direction of the spinning chamber (1). Preferred Features: At least one compressed air channel (62) is aligned at the base of the fiber collection groove (10). The spinning chamber (1) has an extended fiber sliding surface (4), leading to the fiber collection groove (10). It takes the separated fibers (2) from the fiber feed (3,30).  At least one compressed air channel (63) is aligned at the fiber sliding surface (4), with a rotating direction component in the peripheral direction of the spinning chamber (1), together with a direction component (f4) towards the fiber collection groove (10). At least some air feed channels (64), aligned at the fiber sliding surface (4), are connected to the ambient environment. The base of the fiber collection groove (10) has a low friction effect on the fibers. The yarn take-off channel (5) is on the opposite side of the spinning chamber (1) to the fiber feed, in relation to the fiber collection groove (10). At least one air exhaust port (70) is at a zone of the spinning chamber (1) which is closer to the center point of the spinning chamber (1) than any point on the fiber collection groove (10) where the fibers (2) move. Pref. a number of air exhaust ports (70) are distributed evenly round the spinning chamber (1). The air exhaust ports (70) are elongated openings, with their longer dimension on the peripheral direction of the spinning chamber (1) and their smaller dimension on a radial line. The fiber sliding surface (4) is around an expanding guide zone (8) towards the fiber collection groove (10). The gap decreases between the fiber sliding surface (4) and the guide cone (8) towards the fiber collection groove (10).