CZ278771B6 - Apparatus for continuous spinning of textile yarns - Google Patents

Abstract

The method includes a step of drawing the sliver to the form of a drawn roving having the yarn fineness and strengthened by a twist, a step of centrally guiding the yarn being produced by a guide means before its entry on the rotating working surface for guiding the yarn by the effect of centrifugal forces to a traveller arranged at its edge and carried by the working surface, by which the yarn is guided during its transport out of contact with the working surface for being wound on the rotating spool, the axial position of which with respect to the edge of the working surface is changing during the winding-up, wherein the yarn circles during the guiding along the working surface of a single rotating carrier the rotating spool with the wound-up yarn with a higher frequency. The apparatus comprises a drawing device (1), an guiding eyelet (2) arranged centrally on the axis of the spindle, a rotating carrier of the working surface (5) surrounding the spindle (19) and carrying at the edge of the surface a traveller (12), a device for setting the mutual axial position of the edge of the working surface and of the tube (22) mounted on the rotating spindle, wherein the rotational movement of carrier (6) of the working surface (5), is coupled with the rotational movement of the spindle so as to have a higher angular speed of rotation. <IMAGE>

Description

Equipment for continuous spinning of textile yarns

Technical field

The invention relates to a device for the continuous spinning of textile yarns. More specifically, the device comprises a drive spindle and a hollow bell or cylinder twisting member coaxially surrounding the spindle is mounted independently of the spindle and also provided with a drive, the end of the twisting member on the spindle side being supported by a runner or runners similar to yarn wire for feeding the yarn to the spindle.

BACKGROUND OF THE INVENTION

One known device of the above type and embodiment is described in DE 1 053 365. In this device, the spindle and the twisting member are driven by their drives such that the speed of the twisting member is always less than the number of revolutions of the spindle, corresponds to the spindle speed reduced by the number of yarn windings. In another known device, which is described in DE 30 46 180 C2, the spindle and the twisting member are also driven by their drives such that the speed of the twisting member is always less than the speed of the spindle. However, in comparison with the first known device, the twisting or spindle drive is provided with a built-in freewheel which allows the speed of the twisting or spindle to exceed the speed of the respective drive, and the device can therefore operate at a constant yarn feed speed.

However, if the yarn feed speed is to be increased to achieve a larger amount of yarn per unit of time, the correspondingly increased spindle and torsion speed, which in turn exhibit less in the torsion element than in the spindle, result in the yarn being exposed to increased yarn. tension and tears at the normal, required number of twists. Thus, the practical spindle speed, representing the operating speeds of the machine, cannot substantially exceed 25,000.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to overcome this disadvantage and to create the above-mentioned device in such a way that it can operate reliably even at higher operating speeds, producing at least the same quality yarn without problems.

Substitution officers of this subject 30 have a claim in the claim. Claims 2 and 3 each contain one advantageous specific embodiment of the invention.

An advantage of the device according to the invention is that the yarn is temporarily reinforced during twisting with a higher number of twists than is finally required, so that it can be subjected to increased tension at this stage without breaking. As a result, textile yarns can now be produced or spun at a substantially higher speed on the machine, and the spindle speed can quite well reach values of 40,000 to 50,000.

-1GB 278771 B6

Overview of the drawings

The device according to the invention is schematically shown in the accompanying drawings, in which Fig. 1 is a partial sectional view of the device and Fig. 2 is the same view but showing another preferred embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIG. 1, the twisting member 1 coaxially surrounds the spindle 2 is hollow bell shaped. It has a tapered and somewhat elongated upper end 3, which is supported by a rotary bearing 4 in the fixed support 5, and a cylindrical lower end 6, which is also supported by the second rotary bearing 7 on this fixed support. Between the two rotary bearings 4 and 7, a pulley 8 is fixedly mounted on the twisting member 1, which is driven by a belt 9 extending from the electric motor 10. At the lower end 6 of the twisting member, a ring 11, which carries the slider 12, is fixed. The spindle 2 with the sleeve 13 is also provided with an electric motor 14, with which, however, it forms an integral building unit which is placed on the bench 15.

The spindle motor 14 is powered from the first frequency converter 16, wherein the frequency of the power supply current is preset or during operation of the steering device depending on the diameter of the yarn winding by the adjusting member 17. By contrast, the electric motor 10 driving the twisting member 1 is supplied from the second frequency converter 18 However, in order to keep the number of revolutions given to the twisting member 1 higher than the number of revolutions given to the spindle 2, a coupler is provided between the spindle drive 2 and the twisting member 1 thus formed. This coupler here consists of a summation member 9 through which the two frequency inverters 16 and 18 are connected to each other. In this case, the first frequency converter 16 receives a control voltage proportional to the desired speed of the spindle 2 from the first adjusting member 17, as mentioned above. This control voltage is also supplied to the summation member 19, where it is increased in proportion to the desired, increased number of revolutions of the twisting element 1 by means of an additional control voltage which is supplied to the summation member 19 from the second adjusting member 20 ♦.

In the embodiment of the device shown in Fig. 2, the spindle drive 2 is formed in the same manner as in the example of Fig. 1. The electric motor 14 can also be supplied in the same way from the first frequency converter 16 (not shown). On the other hand, however, the drive of the twisting member 1 and hence the coupling element are formed by the transmission device 21 as well as by means of which the twisting member 1 is movably coupled to the electric motor 14A of the spindle 2.

This transmission device 21 comprises a pulley 22 which is fixedly mounted on the spindle 2 and which, when the spindle 2 is rotated, drives the pulley 24 of the longitudinally grooved shaft 25 by means of the belt 23. The grooved shaft 25 is rotatably but axially firmly supported on the bench 15. Its grooved portion 26 'coaxially extends into a similarly grooved and in this manner grooved shaft driven gear 27, which is axially guided in the fixed support 5 of the twisting member 1. With this gear 27 it engages a further gear 28 mounted on a support shaft 29. The support shaft 29 is also rotatably mounted in a fixed support 5 and is provided with a pulley 30, which in turn drives the pulley 8 of the twisting member 1 via the belt 31.

1 or 2, the setting of the frequency of the supply current in the second frequency converter 18 or the dimensioning of the transmission device 21 in terms of the transmission ratio must be carried out in such a way that the speed of the twisting member 1 is maintained at which reaches at least the value given by the relationship

N _s . 0 + 1

V ^N d = ^N s · ^{N N} · v

where

N _d = rotational speed of the twisting element n _s = rotational speed of the spindle

O = yarn winding circumference

V = yarn feeding speed

In practice, this means that if N _{s is} to be, for example, 50,000 / min a

At 80 m / min, then at one normal 0 = 78.5 mm, the value of N _{d is} reached:

N _d = 50,000. 1.02 = 51,000

The yarn 32 is fed by an output pair of rollers 33 of a conventional drawing device through a guide ring 34 fixed in the upper end 2 of the twisting member 1 into the interior of the rotating twisting member 1 and then fed via the slider 12 to the also rotating winding sleeve 12. to which it winds up.

Thereby the yarn 32 is given the desired final number of twists. However, since the twisting member 1 has a higher speed than the spindle 2 or the sleeve 13 or the yarn winding 35, the yarn 32 is imparted a higher number of twists by the inner wall 36 to which the yarn 32 is subjected to centrifugal forces. However, this is only transient, since the yarn 32, after leaving the runner 12 and before arriving at the sleeve 13 or the yarn winding 35 or the yarn winding 35, loses the corresponding excess twist without further. In this case, if the speed of the twisting member 1 is even higher than the speed of the spindle 2 than that which it must at least achieve, the frictional forces occurring between the yarn 32 and the inner wall 36 of the twisting member 1 are reduced to such an extent that to roll this inner wall 36, which makes it less hairy. In addition, the yarn 32 is less loaded in tension and the device can therefore operate more reliably.

Claims (3)

1. A device for the continuous spinning of textile yarns, comprising a driven spindle and a bell or cylinder twisting member coaxially surrounding the spindle, which is mounted independently of the spindle and also provided with the drive, the end of the twisting member on the spindle side being supported by the runner or a runner-like yarn guide for feeding the yarn to the spindle, characterized in that a coupling is provided between the spindle drive (2) and the twisting member drive (1) to maintain the speed of the twisting member (1) at a number greater than the number spindle speed (2) and which reaches at least the value given by the relation -----— + 1 IN N _d = N _s .--. N _s · 0 Where Nj = number of revolutions of the twisting element N _s = spindle speed 0 = yarn winding circumference V = yarn feeding speed Device according to claim 1, characterized in that the spindle drive (2) is constituted by an electric motor (14) fed from the first frequency converter (16) and the twisting organ drive (Ί) is formed by another electrometer (10) fed from the second the frequency converter (18), wherein the coupler between these drives consists of a summation (19) through which the two frequency converters (16/18) are connected. Device according to claim 1, characterized in that the spindle drive (2) is formed by an electric motor (14) and the drive of the twisting member (1) and at the same time the coupling between these drives is formed by a transmission device (21). the twisting member (1) is movably coupled to the electric motor (14) of the spindle (2).