Abstract: A spinning nozzle for an air-jet spinning machine has a base body with an internal turbulence chamber, an inlet opening for the fiber sliver which enters the turbulence chamber and a fiber guide channel for guiding the fiber sliver entering the inlet opening. A thread-forming element extends at least partially into the turbulence chamber and has an inlet mouth as well as an adjoining take-off channel for the thread in the transport direction. Air nozzles are directed into the turbulence chamber. The spinning nozzle has an extension piece that is releasably fixed to the base body in the region of the inlet opening, wherein the fiber guide channel adjoining the inlet opening is formed at least partially by a channel section of the extension piece.

Abstract: A roving machine for producing a roving from a sliver has at least one spinning station that has a vortex chamber with an infeed opening for the sliver and a roving forming element in the form of a spindle extending at least partially into the vortex chamber. The vortex chamber is associated with at least one air nozzle via which air is guided into the vortex chamber, and wherein the spindle has a draw-off channel via which the roving is drawn out of the vortex chamber. In the region of the vortex chamber, the draw-off channel has an inlet port for the roving to be drawn out of the vortex chamber, wherein the inlet port has an inner diameter that lies between 4 mm and 12 mm, preferably between 6 mm and 8 mm.

Abstract: A roving machine for producing a roving (1) from a sliver (2), has at least one spinning station (3) with a vortex chamber (4) having an infeed opening (5) for the sliver (2) and a roving forming spindle (6) extending at least partially into the vortex chamber (4). The vortex chamber (4) is associated with at least one air nozzle (8). The spindle (6) has a draw-off channel (9) via which the roving (1) can be drawn out of the vortex chamber (4). In the region of the vortex chamber (4), the draw-off channel (9) has an inlet port (10) for the roving (1) to be drawn out of the vortex chamber (4), wherein the inlet port has an inner diameter (F), the value of which lies between 4 mm and 12 mm.