Thread Draw-Off Nozzle for an Open-End Spinning Device

Abstract

A thread draw-off nozzle (1) for an open-end spinning device (2) features a nozzle insert (3) for deflecting a produced yarn (5) and a nozzle frame (4), by means of which the thread draw-off nozzle (1) can be fixed in the open-end spinning device (2). The nozzle frame (4) features a cylindrical shank (6). The shank (6) of the nozzle frame (4) is provided with a centering diameter (ZD) and the cylindrical shank (6) of the nozzle frame (4) is shorter than half the centering diameter (ZD).

Claims

1. Thread draw-off nozzle (1) for an open-end spinning device (2) with a nozzle insert (3) for deflecting a produced yarn (5) and with a nozzle frame (4), by means of which the thread draw-off nozzle (1) can be fixed in the open-end spinning device (2), whereas the nozzle frame (4) features a cylindrical shank (6), characterized in that the shank (6) of the nozzle frame (4) is provided with a centering diameter (ZD) and that the cylindrical shank (6) of the nozzle frame (4) is shorter than half the centering diameter (ZD).

2-10. (canceled)

Description

[0020] Additional advantages of the invention are described on the basis of the following presented embodiments. The following is shown:

[0021] FIG. 1 an open-end spinning device with a thread draw-off nozzle in a sectional overview illustration,

[0022] FIG. 2 a sectional illustration of a thread draw-off nozzle with a nozzle insert and a nozzle frame according to a first embodiment,

[0023] FIG. 3 a sectional illustration of a thread draw-off nozzle with a nozzle insert and a nozzle frame with a ferromagnetic insert,

[0024] FIG. 4 a sectional illustration of a thread draw-off nozzle with a nozzle insert and a nozzle frame according to an additional embodiment, and

[0025] FIG. 5 a sectional illustration of a thread draw-off nozzle with a nozzle insert and a nozzle frame without a nozzle plate.

[0026] FIG. 1 shows a schematic sectional illustration of a spinning rotor 13 along with a thread draw-off nozzle 1 in an open-end spinning device 2, which is only partially shown. From the open-end spinning device 2, a cover element 14 is shown; with the present invention, it closes a rotor housing 18 (which is shown here only broken off) during the operation of the open-end spinning device 2. The open-end spinning device 2 also has a spinning rotor 13, which rotates at a high rotational speed in a known manner, into which a spinning material dissolved in individual fibers is fed through a fiber feed channel 19 (dashed line). Thereby, the fiber feed channel 19 passes through the cover element 14 and ends in an extension of the cover element projecting into the opening of the spinning rotor 13. By way of derogation from the illustration shown, the extension that projects into the opening of the spinning rotor 13 can also be arranged on a channel plate adapter that can be fixed in the cover element 14 in an interchangeable manner.

[0027] The fiber material to be fed is incorporated into the end of the already spun yarn 5 based on the rotation of the spinning rotor 13, such that the yarn 5 is continuously drawn off of the spinning rotor 13 through the thread draw-off nozzle 1 and a yarn draw-off channel 16 of the cover element 14. As a result of the rotation of the spinning rotor 3, the yarn end reaching into the rotor groove 17 circulates in the manner of a crank, and thereby sweeps over a yarn deflecting surface of the thread draw-off nozzle 1. Therefore, the thread draw-off nozzle 1 is exposed to considerable thermal loads and an abrasive action of the yarn 5. The thread draw-off nozzle 1 is likewise attached to the extension of the cover element 14 (or of a channel plate adapter) projecting into the interior of the spinning rotor 13. For inserting the thread draw-off nozzle 1 into the cover element 14, the latter features a correspondingly shaped receptacle 15.

[0028] FIG. 2 shows a sectional detail illustration of a thread draw-off nozzle 1 according to a first embodiment. The thread draw-off nozzle 1 is designed in two parts with a nozzle frame 4 along with and a nozzle insert 3, which, with the present invention, are connected to one another by adhesive bonding. For this purpose, the nozzle frame features an adhesive surface 11a, which is oriented perpendicularly to a shank 6 of the nozzle frame 4, in the form of a ring-shaped indent, which corresponds to an adhesive surface 11b of the nozzle insert provided in the form of a ring-shaped stepped recess. As can be seen in FIG. 2, the nozzle insert 3 and the nozzle frame 4 are configured in such a manner that they only come into contact with one another through the adhesive surfaces 11a and 11b. Through this configuration, a very narrow and defined adhesive gap is achieved, such that only a very thin layer of adhesive is necessary, and thus the heat-conducting contact between the nozzle frame 4 and the nozzle insert 3 is provided.

[0029] The nozzle insert 3 is preferably designed as a ceramic insert in a conventional manner, and is thus particularly resistant to wear. Furthermore, in a simple manner, the embodiment of the nozzle insert 3 made of a ceramic material enables the introduction of surface structures 20, such as notches or spirals, which improve the technological effect of the thread draw-off nozzle 1.

[0030] On the other hand, the nozzle frame 4 is produced from a metallic material, in particular a steel material, and thus enables good heat dissipation of the temperature for the open-end spinning device 2 arising in the nozzle insert 3. At the same time, the production of the nozzle frame 4 made of a steel material easily enables the fixing of the thread draw-off nozzle 1 in the open-end spinning device 2 by means of a magnetic fastener. For this purpose, the nozzle frame 4 features a contact surface 21 that is likewise ring-shaped, which interacts with permanent magnets of the open-end spinning device (not shown).

[0031] Thus, the shank 6 of the nozzle frame 4 no longer serves to attach the thread draw-off nozzle 1 in the open-end spinning device, and can therefore be designed to be particularly short. With the embodiment shown here, the shank 6 solely serves to center the thread draw-off nozzle in the open-end spinning device 2, and is provided with a centering diameter ZD for this purpose. Therefore, the length L of the shank 6, which extends between the ring-shaped contact surface 21 and a lower edge 22 of the nozzle frame 4, can be reduced to a minimum and is shorter than half of the centering diameter ZD. Thereby, the thread draw-off nozzle can be produced in a particularly compact shape with only a small space requirement, and thus, even with very small spinning rotors with a diameter of 26 mm and less, can also be easily accommodated in the cover element 14 or in a channel plate adapter. It is also particularly advantageous if the outer diameter AD, which in the present case also corresponds to a head diameter of the thread draw-off nozzle 1, is also designed to be particularly small and amounts to, for example, less than 16 mm.

[0032] The present thread draw-off nozzle 1 can be produced particularly cost-effectively, since conventional ceramic nozzle inserts 3 can be easily reused by the previously known thread draw-off nozzles. With the thread draw-off nozzle 1, it is also particularly advantageous that, based on the ring-shaped contact surface 21, it can be positioned very accurately with respect to its position or its distance from the rotor groove 17, since tilting can largely be ruled out.

[0033] FIG. 3 shows another embodiment of a thread draw-off nozzle 1, which can also be fixed in the open-end spinning device 2 by means of a magnetic fastener. Thereby, the same components are provided with the same reference signs as with the draw-off nozzle 1 of FIG. 2. Therefore, only the differences with the embodiment of FIG. 2 will be discussed below.

[0034] For magnetic attachment, the thread draw-off nozzle 1 in accordance with FIG. 3 features a ferromagnetic insert 8, which can be designed to be ring-shaped, for example, or can be formed by at least two separate inserts 8, which are arranged on sides opposite to each other. Therefore, it is not necessary to produce the nozzle frame 4 from a steel material; rather, independently of the magnetic properties, a material with a particularly good thermal conductivity, for example an aluminum material, can be used. As described above, the connection between the nozzle insert 3 and the nozzle frame 4 can be effected by means of an adhesive connection through the adhesive surfaces 11a and 11b.

[0035] However, by way of derogation from the illustrations shown in FIGS. 2 and 3, it is not absolutely necessary to provide a defined, ring-shaped adhesive surface 11a, 11b by means of an indent. Likewise, the opposing surfaces of the nozzle frame 4 and the nozzle insert 3, which are to be glued to one another, could also be formed without an indent, and thus without a firmly fixed adhesive surface 11a, 11b, as shown, for example, in FIG. 4. However, for the reasons mentioned above, a defined adhesive surface with a uniform adhesive gap is advantageous.

[0036] Furthermore, the thread draw-off nozzles 1 or the nozzle frames 4 of FIGS. 2 and 3 both feature a nozzle plate 7, which encloses the nozzle insert 3 of the thread draw-off nozzle on its underside, which is turned away from the spinning rotor 13 in operation. The nozzle plate 7 imparts upon the nozzle frame 4 a high degree of stability and protects it from damage. In addition, with its underside, the nozzle plate 7 provides an additional contact surface for a heat-conducting contact with the open-end spinning device 2, as can be particularly seen in FIG. 1. Therefore, the heat dissipation of such a thread draw-off nozzle to the open-end spinning device 2 is particularly good, and overheating on the surface of the nozzle insert 3 can thus be avoided. In principle, however, it is likewise conceivable to design the nozzle frame 4 without a nozzle plate 7, as is shown, for example, in FIG. 5.

[0037] FIG. 4 shows an additional embodiment of a thread draw-off nozzle 1, which is not attached magnetically; rather, it is attached in the open-end spinning device 2 by means of a threaded pin (not shown). For this purpose, the cover element 14 is provided with a threaded bore 10, into which the threaded pin can be inserted, and thereby fixes the thread draw-off nozzle 1 in the cover element 14 through the shank 6 of the nozzle frame 4.

[0038] Thereby, as shown with the present invention, a recess 9 can also be provided in the shank 6; this works together with a tip of the threaded pin. The thread draw-off nozzle 1 can thus be fixed particularly well and, if required, can also be positioned in the open-end spinning device 2 with respect to its circumferential direction.

[0039] In contrast to the two preceding illustrations, with the present thread draw-off nozzle 1, no ring-shaped adhesive surfaces 11a, 11b are provided; rather, an adhesive is introduced completely over the entire area between the two parts, the nozzle frame 4 and the nozzle insert 3. It is understood that such thread draw-off nozzle 1 could also be provided with defined adhesive surfaces 11a, 11b. It is likewise understood that not only notches, but also any other surface structures, are possible as surface structures 20. In all other respects, the thread draw-off nozzle 1 corresponds to the two previously described nozzles.

[0040] Finally, FIG. 5 shows an additional embodiment of a thread draw-off nozzle 1, in which the nozzle frame 4 has no nozzle plate 7. As described above, the thread draw-off nozzle 1 can be fixed with both a magnetic fastener and a threaded pin in the cover element 14, and can also have adhesive surfaces 11a, 11b. Such a thread draw-off nozzle 1 without a nozzle plate 7 is particularly suitable for a magnetic fastener, since, with this, high forces do not act on the shank 6 of the nozzle frame 4.

[0041] The invention is not limited to the illustrated embodiments. Variations and combinations within the framework of the claims also fall under the invention.

LIST OF REFERENCE SIGNS

[0042] 1. Thread draw-off nozzle [0043] 2. Open-end spinning device [0044] 3. Nozzle insert [0045] 4. Nozzle frame [0046] 5. Yarn [0047] 6. Shank [0048] 7. Nozzle plate [0049] 8. Insert [0050] 9. Recess [0051] 10. Threaded bore [0052] 11. Adhesive surface [0053] 11a Adhesive surface of the nozzle frame [0054] 11b Adhesive surface of the nozzle insert [0055] 12. Lower edge of the nozzle insert [0056] 13. Spinning rotor [0057] 14. Cover element [0058] 15. Receptacle [0059] 16. Yarn draw-off channel [0060] 17. Rotor groove [0061] 18. Rotor housing [0062] 19. Fiber feed channel [0063] 20. Surface structures [0064] 21. Contact surface [0065] 22. Lower edge of the nozzle frame [0066] Length of the shank [0067] ZD Centering diameter [0068] AD Outer diameter