THREAD DRAW-OFF NOZZLE AND OPEN-END SPINNING DEVICE HAVING A THREAD DRAW-OFF NOZZLE

Abstract

An open-end spinning device having a thread draw-off nozzle and a thread draw-off nozzle for an open-end spinning device, the thread draw-off nozzle having a thread-guiding surface which extends between an entry opening and a draw-off opening and which tapers in the shape of a funnel toward the draw-off opening. In order to provide a thread draw-off nozzle and an open-end spinning device having a thread draw-off nozzle which allows controlled production of the thread, the thread draw-off nozzle has a blocking element, which protrudes from the thread-guiding surface and which has a thread stop surface designed such that the thread stop surface blocks a thread from circulating over the thread-guiding surface.

Claims

1. A thread draw-off nozzle for an open-end spinning device, comprising: a thread-guiding surface which extends between an entry opening and a draw-off opening and which tapers in a shape of a funnel toward the draw-off opening; and a blocking element which protrudes from the thread-guiding surface and which has a thread stop surface designed such that the thread stop surface blocks a thread from circulating over the thread-guiding surface.

2. The thread draw-off nozzle according to claim 1, wherein the blocking element has a ridge-type protrusion extending in a longitudinal axis direction of the thread draw-off nozzle.

3. The thread draw-off nozzle according to claim 2, wherein the ridge-type protrusion has a thread stop surface which extends at a right angle to the thread-guiding surface.

4. The thread draw-off nozzle according to claim 1, wherein the thread-guiding surface has, in a region of the entry opening, an end portion which is curved in a peripheral direction.

5. The thread draw-off nozzle according to claim 1, wherein the blocking element extends in a longitudinal axis direction of the thread draw-off nozzle over an entire region between the entry opening and the draw-off opening.

6. The thread draw-off nozzle according to claim 1, wherein the blocking element extends in a longitudinal axis direction of the thread draw-off nozzle between the entry opening and a central region of the thread-guiding surface.

7. The thread draw-off nozzle according to claim 1, wherein the blocking element and the thread draw-off nozzle are formed as a single piece.

8. The thread draw-off nozzle according to claim 1, wherein the thread stop surface has a profile.

9. An open-end spinning device, comprising: a thread draw-off nozzle, which has a thread-guiding surface which extends between an entry opening and a draw-off opening and which tapers toward the draw-off opening; wherein the thread-guiding surface has a blocking element which protrudes from the thread-guiding surface and which has a thread stop surface designed such that the thread stop surface blocks a thread from circulating over the thread-guiding surface.

10. (canceled)

11. The open-end spinning device according to claim 9, wherein the blocking element has a ridge-type protrusion extending in a longitudinal axis direction of the thread draw-off nozzle.

12. The open-end spinning device according to claim 11, wherein the ridge-type protrusion has a thread stop surface which extends at a right angle to the thread-guiding surface.

13. The open-end spinning device according to claim 9, wherein the thread-guiding surface has, in a region of the entry opening, an end portion which is curved in a peripheral direction.

14. The open-end spinning device according to claim 9, wherein the blocking element extends in a longitudinal axis direction of the thread draw-off nozzle over an entire region between the entry opening and the draw-off opening.

15. The open-end spinning device according to claim 9, wherein the blocking element extends in a longitudinal axis direction of the thread draw-off nozzle between the entry opening and a central region of the thread-guiding surface.

16. The open-end spinning device according to claim 9, wherein the blocking element and the thread draw-off nozzle are formed as a single piece.

17. The open-end spinning device according to claim 9, wherein the thread stop surface has a profile.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] An embodiment example of the present invention is shown below in the drawings. In the drawings:

[0015] FIG. 1 shows an open-end spinning device schematically in cross-section;

[0016] FIG. 2 shows a perspective view of a draw-off nozzle having a blocking element; and

[0017] FIG. 3 shows a top view of the thread draw-off nozzle of FIG. 2.

DETAILED DESCRIPTION

[0018] According to FIG. 1, an open-end spinning device 1 comprises, as essential elements, a feeding device 2, an opening device in the form of an opening roller 3, a spinning element in the form of a spinning rotor 4, a thread draw-off device in the form of a thread draw-off roller pair 6, and a thread winding device 7. The feeding device 2 has a feed roller 11, with which a feed tray 12 elastically cooperates. The opening roller 3 of the opening device is mounted in a housing 5, which, in the embodiment example shown, has a dirt separation opening 8 in its peripheral wall. With respect to the fibre transport direction, a fibre feed channel 9 extending into the spinning rotor 4 begins following the dirt separation opening 8. The spinning rotor 4 is arranged in a housing 10, which is connected to a negative pressure source (not shown) by a negative pressure line 13 so that a negative spinning pressure is produced. The thread wind-up device 7 has a winding roller 14, by which a bobbin 15 is driven. A thread draw-off channel 16 extends into the housing 10.

[0019] During the production, a sliver 18 is fed to the opening roller 3 via the feed tray 12 by the feed roller 11. The opening roller 3 opens the sliver 18 into individual fibres 17. The fibres 17 are brought into the rotor groove 19 of the spinning rotor 4 via a fibre feed-in line 23 by the negative spinning pressure and from there are drawn off as a thread 20 via the thread draw-off nozzle 21 and the thread draw-off channel 16 by a thread draw-off roller pair 6 and conveyed to the winding device 7.

[0020] The thread end of the thread 20 being drawn off from the rotor groove 19 actually wants to rotate like a crank around the thread draw-off nozzle axis, which is (essentially) identical to the rotor axis. But this thread end is prevented from calmly sweeping over a funnel-shaped thread-guiding surface 28 of the draw-off nozzle 21 by a blocking element 22.

[0021] In the thread draw-off nozzle 21 shown in FIGS. 2 and 3, the blocking element 22 has a ridge-type protrusion 29, which extends in the longitudinal axis direction of the thread draw-off nozzle and a thread stop surface 27 of which protrudes at a right angle from the thread-guiding surface 28 extending from the entry opening 25 to the draw-off opening 24. The thread stop surface 27 prevents circulation of the thread 20 drawn off from the rotor groove 19; the thread 20 slides on the thread stop surface 27 while being drawn off from the spinning rotor 4.

[0022] In FIG. 3, the blocking element 22 extends in the longitudinal axis direction of the thread draw-off nozzle 21 between the entry opening 25 and a central region of the thread-guiding surface 28. According to an alternative which is not shown, it is also possible that the blocking element 22 extends in the longitudinal axis direction of the thread draw-off nozzle 21 over the entire region between the entry opening 25 and the draw-off opening 24.

[0023] In the region of the entry opening 25, the protrusion 29 is curved in an end portion 26, the curvature being directed in the direction of rotation of the spinning rotor 4, so that the thread 20 is guided trouble-free over the end portion 26 along the thread stop surface 27.

[0024] When the fibres 17 are fed in via the fibre feed-in line 23 in the fibre feed-in region F shown in FIG. 3, a free region is created in the spinning rotor 4. This free region extends in the circumferential direction between the blocking element 22 and the fibre feed-in region F, and in this free region the spinning rotor 4 enters into operative connection neither with the fed-in fibres 17 nor with the drawn-off thread 20. Thus, this region can be used for supplementary units (not shown here), such as a rotor cleaning unit.

LIST OF REFERENCE SIGNS

[0025] 1 Open-end spinning device [0026] 2 Feeding device [0027] 3 Opening roller [0028] 4 Spinning rotor [0029] 5 Housing [0030] 6 Thread draw-off roller pair [0031] 7 Thread winding device [0032] 8 Dirt separation opening [0033] 9 Fibre feed channel [0034] 10 Housing [0035] 11 Feed roller [0036] 12 Feed tray [0037] 13 Negative pressure line [0038] 14 Winding roller [0039] 15 Bobbin [0040] 16 Thread draw-off channel [0041] 17 Fibres [0042] 18 Sliver [0043] 19 Rotor groove [0044] 20 Thread [0045] 21 Thread draw-off nozzle [0046] 22 Blocking element [0047] 23 Fibre feed-in line [0048] 24 Draw-off opening [0049] 25 Entry opening [0050] 26 End portion [0051] 27 Thread stop surface [0052] 28 Thread-guiding surface [0053] 29 Protrusion [0054] F Fibre feed-in