Drafting device for spinning-knitting machines

Abstract

A drafting device for spinning-knitting machines includes a drafting arrangement with which at least two roving yarns can be drawn parallel to form fiber strands and at an outlet of which a nozzle unit with twist nozzles arranged parallel to one another for each of the drawn fiber strands is arranged. Between the inlets of the twist nozzles, the nozzle unit is provided with a respective plate-shaped separator projection that extends up to a withdrawal roller pair of the drafting arrangement.

Claims

1. A drafting device for spinning-knitting machines, comprising: a drafting arrangement for drawing at least two roving yarns in parallel to form fiber strands; a nozzle unit with twist nozzles arranged parallel to one another for each of the drawn fiber strands arranged at an outlet of the drafting arrangement; wherein the nozzle unit is provided with a plate-shaped separator projection between inlets of the twist nozzles that extends up to a withdrawal roller pair of the drafting arrangement, and wherein the separator projection is arranged on a housing for the twist nozzles in the center between adjacent twist nozzles.

2. The drafting device according to claim 1, wherein the separator projection is oriented perpendicular to axes of the withdrawal roller pair.

3. The drafting device according to claim 1, wherein the separator projection has a point that projects into a recess between the rollers of the withdrawal roller pair.

4. The drafting device according to claim 3, wherein the point has flanks that run parallel to a cylindrical surface of the rollers of the withdrawal roller pair, at least in sections.

5. The drafting device according to claim 1, wherein the separator projection is fabricated from a metal sheet.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A preferred exemplary embodiment of a drafting device is described in more detail with reference to the drawing.

(2) FIG. 1 is a schematic side view of a drafting device and a needle of a knitting machine;

(3) FIG. 2 is an enlarged side view of the drafting device from FIG. 1;

(4) FIG. 3 is a perspective view from above onto the nozzle unit and the withdrawal roller pair of the drafting device from FIG. 1;

(5) FIG. 4 is a perspective detail view of the nozzle unit of the drafting device from FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

(6) According to FIG. 1 the drafting device 10 has a drafting arrangement 11 and also a nozzle unit 12. The drafting arrangement 11 in the represented example is a three-cylinder drafting arrangement with a feed roller pair 13, a double apron roller pair 14 and also a withdrawal roller pair 15. Between the upper and lower rollers of the roller pairs 13, 14 and 15 two fibre strands (not shown) are drawn parallel and fed to the nozzle unit 12. In the nozzle unit 12 the fibre strands are provided with a false twist and fed via tubes 16, 17 to knitting needles 18 of a knitting machine (not shown further).

(7) As can better be seen from FIGS. 3 and 4, the nozzle unit has two twist nozzles 19, 20, between which a separator projection 21 is arranged on a housing 22 for the twist nozzles 19, 20. FIG. 2 in particular illustrates that the separator projection 21 has a point 23, the flanks 24, 25 of which are curved in accordance with the cylindrical surface of the two rollers 15.1 and 15.2 of the withdrawal roller pair 15. This results in a uniform distance between the separator projection 21 and the rollers 15.1 and 15.2. The separator projection 21 can thus develop its action of separating the transport paths of the two fibre strands in an optimum manner. The fibre strands cannot be aspirated by the respective adjacent twist nozzle 19, 20.

(8) As illustrated in FIGS. 3 and 4, the separator projection 21 is plate-shaped in configuration and is arranged in the centre between the twist nozzles 19, 20 on the housing 22. It can preferably be a sheet metal part, which can be fastened to the housing 22 by gluing, welding or soldering.