Method for operating a spindle of a two-for-one twisting or cabling machine and associated two-for-one twisting or cabling machine

Abstract

A method for operating a spindle (2) of a two-for-one twisting or cabling machine, in which an outer yarn (5) is drawn off a first feed package (7) and the spindle (2) rotates in a yarn balloon (B), wherein the spindle (2) comprises a device (6) for influencing the balloon yarn tension of an outer yarn (5), which is connected to a control circuit (18), and has a spindle pot (19) for receiving a second feed package (15), a yarn deflection device (20), a balancing system (9) for forming a twisting or cabling point as well as a spooling and winding device (12). The drive of the yarn balloon (B) is performed via a fixed throw-off point (21) on the yarn deflection device (20).

Claims

1. Method for operating a spindle (2) of a workstation (1) of a two-for-one twisting or cabling machine, in which an outer yarn (5) is drawn from a first feed package (7) and rotates in a yarn balloon (B) around the spindle (2), the spindle (2) having a device (6) for influencing the balloon yarn tension of an outer yarn (5) which is connected to a control circuit (18), and having a spindle pot (19) for receiving a second feed package (15), a yarn deflection device (20), a balancing system (9) for forming a twisting or cabling point and a spooling and winding device (12), characterized in that, the yarn balloon (B) is driven via a fixed throw-off point (21) on the yarn deflection device (20); and the workstation (1) is operated without a storage disc.

2. Method according to claim 1, characterized in that the workstation (1) is operated with a rotatably mounted barrel tensioner (26).

3. Method according to claim 1, characterized in that adjusting the yarn balloon form by the device (6) for influencing the balloon yarn tension.

4. Method according to claim 1, characterized in that the control circuit (18) controls the device (6) for influencing the balloon yarn tension such that the desired yarn balloon size is achieved.

5. Method according to claim 1, characterized in that the control circuit (18) controls the device (6) for influencing the balloon yarn tension such that there is always a minimal yarn balloon size.

6. Method according to claim 1, characterized in that the control circuit (18) when starting up or powering down the spindle (2) and in the case of a brief power cut controls the device (6) for influencing the balloon yarn tension such that a yarn balloon size is achieved which avoids contact with the spindle pot (19).

7. Two-for-one twisting or cabling machine comprising a spindle (2) of a workstation (1), which has a device (6) for influencing the balloon yarn tension of an outer yarn (5), which is connected to a control circuit (18), and has a spindle pot (19) for receiving a second feed package (15), a yarn deflection device (20), a balancing system (9) for forming a twisting or cabling point and a spooling and winding device (12), characterized in that, the rotatably mounted yarn deflection device (20) has a fixed throw-off point (21) for the outer yarn (5), and the workstation (1) is operated without a storage disc.

8. Two-for-one twisting or cabling machine according to claim 7, characterized in that the yarn deflection device (20) is in a form of a twisting plate (8a, 8b, 8c).

9. Two-for-one twisting or cabling machine according to claim 7, characterized in that the yarn deflection device (20) is in a form of twisting blades (22a, 22b, 22c).

10. Two-for-one twisting or cabling machine according to claim 7, characterized in that the fixed throw-off point (21) of the yarn deflection device (20) is formed by an eyelet (23).

11. Two-for-one twisting or cabling machine according to claim 7, characterized in that the fixed throw-off point (21) of the yarn deflection device (20) is formed by a slot (24) which is open at the bottom of the yarn deflection device (20).

12. Two-for-one twisting or cabling machine according to claim 7, characterized in that the fixed throw-off point (21) of the yarn deflection device (20) is formed by a closed channel (25).

13. Two-for-one twisting or cabling machine according to claim 7, characterized in that the fixed throw-off point (21) of the yarn deflection device (20) is a component of a rotatably-mounted barrel tensioner (26).

14. Two-for-one twisting or cabling machine according to claim 7, characterized in that the fixed throw-off point (21) is self-threading.

15. Two-for-one twisting or cabling machine according to claim 7, characterized in that the device (6) for influencing the balloon yarn tension is a brake.

16. Two-for-one twisting or cabling machine according to claim 7, characterized in that the device (6) for influencing the balloon yarn tension functions as a yarn delivery device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail in the following with reference to the example embodiments shown in the drawings, wherein:

(2) FIG. 1 shows schematically, in side view a workstation of a two-for-one twisting or cabling machine, with a yarn deflection device, which has a fixed throw-off point,

(3) FIG. 2a, b, c shows different embodiments of a yarn deflection device designed as a twisting plate, in a view from below,

(4) FIG. 3a, b, c shows different embodiments of a yarn deflection device designed as a twisting blade in a view from below,

(5) FIG. 4 shows a further embodiment of a yarn deflection device comprising a fixed throw-off point, in the present example embodiment a barrel tensioner, also in a view from below.

DETAILED DESCRIPTION OF THE INVENTION

(6) FIG. 1 shows schematically in side view a workstation of a two-for-one twisting or cabling machine which is denoted overall by the reference numeral 1.

(7) With reference to the shown workstation 1 the method according to the invention is also explained in the following.

(8) The workstation 1 of the two-for-one twisting or cabling machine comprises, as usual, a creel 4 positioned above or behind the workstation 1, which is used for mounting at least one first feed package 7 from which a so-called outer yarn 5 is drawn.

(9) The workstation 1 also has a spindle 2, which is designed in the present example embodiment as a so-called cabling spindle.

(10) The spindle 2 comprises a spindle pot 19 in which a second feed package 15 is mounted from which a so-called inner yarn 16 is drawn off over head which is supplied to a balloon eyelet arranged above the spindle 2 or a so-called balancing system 9.

(11) The spindle pot 19 is mounted on the rotatable yarn deflection device 20 which is designed in the example embodiment of FIG. 1 as a twisting plate 8. The spindle pot 19 supported on the rotatable yarn deflection device 20 is thereby secured against rotation, preferably by a (not shown) magnet device.

(12) The yarn deflection device 20 of the spindle 2 is pressurised by a spindle drive 3, in that, as in the example embodiment, it can either be a direct drive or an indirect drive.

(13) In the latter case the yarn deflection device 20 is connected for example via a belt drive to a corresponding drive.

(14) The outer yarn 5 drawn off the first feed package 7 is supplied to a controllable device 6 arranged in the yarn run between the creel 4 and the spindle 2 for influencing the yarn tension. This means that by means of the device 6 the yarn tension of the outer yarn 5 can be varied, if necessary.

(15) The device 6 is connected via control lines 27 to a control circuit 18, which controls the yarn tension applied by the device 6 on the outer yarn 5.

(16) As also shown in FIG. 1 the device 6 for influencing the yarn tension in yarn running direction is arranged in front of the yarn deflection device 20, which is designed in the example embodiment as a twisting plate 8.

(17) This means that the outer yarn 5 after the device 6 runs through the spindle drive 3 in the region of the axis of rotation 28 of the spindle drive and exits underneath the twisting plate 8 through a so-called yarn exit bore 29 in radial direction out of the hollow axis of rotation 28 of the spindle drive 3.

(18) The outer yarn 5 then runs to the outer area 30 of the twisting plate 8, where a fixed throw-off point 21 is installed for the outer yarn 5.

(19) Said fixed throw-off point 21 can be designed as an eyelet 23 as shown for example in the embodiment of FIG. 1.

(20) However, as will be explained in the following with reference to FIGS. 2-4, in connection with a yarn deflection device 20 which has a fixed throw-off point 21, other embodiments are possible and can be used in practice.

(21) In the embodiment according to FIG. 1 the outer yarn 5 is deflected upwards in the region of the eyelet 23 of the twisting plate 8 and rotates forming a free yarn balloon B around the spindle pot 19 of the spindle 2, in which a second feed package 15 is positioned.

(22) The outer yarn 5 drawn off the first feed package 7 and the inner yarn 16 drawn off the second feed package 15 are brought together in the region of the balloon eyelet or the balancing system 9.

(23) As can be seen clearly, the height of the forming free yarn balloon B is determined by means of the position of the balloon eyelet or the balancing system 9.

(24) In the balloon eyelet or in the balancing system 9 is the so-called cabling or also cording point, at which the two yarns, the outer yarn 5 and the inner yarn 16, run together and form for example a cord yarn 17.

(25) Above the cabling point a yarn drawing device 10 is arranged by means of which the cord yarn 17 is drawn off and supplied via a balancing element, such as for example a compensator device 11, to a spooling and winding device 12.

(26) The spooling and winding device 12 comprises, as usual, a drive roller 13 and a bobbin 14 driven frictionally by the drive roller 13.

(27) In the method according to the invention the device 6 for influencing the yarn tension has the additional special task of varying, in particular increasing, the yarn tension of the outer yarn 5 ahead of the yarn deflection device 20 equipped with a fixed throw-off point 21, such that a storage disc can be omitted and also a co-rotating balloon limiting pot, which has previously been used for balancing unevenness in the yarn supply.

(28) The yarn tension which can be controlled by the device 6 on the outer yarn 5 preferably has an order of magnitude which, depending on the geometry of the spindle 2, minimises the free yarn balloon B.

(29) This is achieved by a fixed predetermined launch geometry of the outer yarn 5, which results from the fixed throw-off point 21 of the yarn deflection device 20.

(30) This means that because of the fixed throw-off point 21 of the yarn deflection device 20 and the increased yarn tension in the region of the fixed throw-off point 21 there is automatically a launch angle of the outer yarn 5 which minimises the diameter of the forming free yarn balloon B.

(31) As already described above in the method according to the invention or in the device according to the invention during the whole operating period of the device there is no yarn storage.

(32) The device 6 for influencing the yarn tension can either be designed as an electronically controlled brake or as an active delivery device. Also a combination of the two aforementioned components can be used.

(33) As embodiment variants of the delivery device for example a godet, a fan disc or a drive roller with corresponding pressing roller are possible. It is important that in order to maintain the free yarn balloon B to have as far as possible a constant, minimised diameter, by means of the device 6 it is always possible to actively influence the yarn tension by control.

(34) This means that the control circuit 18 connected via control lines 27 to the device 6 uses for example the tension of the outer yarn 5 before or after the formation of the free yarn balloon B as an adjusting variable.

(35) In order to immediately balance out fluctuations of yarn supply speeds which cause changes in the yarn tension, alternatively or in addition as an adjusting variable also the diameter of the yarn balloon B or the power consumption of the spindle drive 3 can be used.

(36) The yarn tension for controlling the device 6 can be monitored electronically and/or mechanically, for example by a compensating roller or a conical roller.

(37) When using a compensating roller, which is connected to the outer yarn 5, the deflection of the latter is detected on the basis of the changing yarn tension which is used as an adjusting variable of the device 6 for influencing the yarn tension.

(38) FIGS. 2a, 2b and 2c show different embodiments of a yarn deflection device 20 designed as a twisting plate 8a, 8b, 8c and equipped respectively with a fixed throw-off point 21.

(39) The twisting plate 8a shown in FIG. 2a comprises, for example in the region of the axis of rotation 28 of the spindle 2, an axially running yarn guiding bore 31 and a yarn exit bore 29 branching radially from the latter.

(40) Furthermore, the twisting plate 8a spaced apart from a radially arranged yarn exit bore 29 and slightly spaced apart from is outer area 30 has an eyelet 23, which is preferably made from a wear-distant material, for example ceramic, and which functions as a fixed throw-off point 21 for the yarn deflection device 20.

(41) This means that during the operation of the spindle 2 the outer yarn 5 coming from the first feed package 7 rotates through the axis of rotation 28 of the spindle 2 into the yarn guiding bore 31 of the twisting plate 8a and then via the yarn exit bore 29 to the wear-resistant eyelet 23, which rotates with the twisting plate 8a.

(42) The outer yarn 5 traversing the eyelet 23 is also subjected to rotation and thereby forms a yarn balloon B which is minimized with respect to its diameter.

(43) The twisting plate 8b shown in FIG. 2b also comprises in the region of the region of the axis of rotation 28 of the spindle 2 an axially running yarn guiding bore 31 and a yarn exit bore 29 branching radially off the latter.

(44) A preferably linear yarn guiding device leading to the outer area 30 of the twisting plate 8b is connected to the yarn exit bore 29, which yarn guiding device is designed either as shown in FIG. 2b as a closed channel 25 or as shown in FIG. 2c as a slot 24 open at the bottom.

(45) The outlet point of the channel 25 or the slot 24 form respectively a fixed throw-off point 21 for the yarn deflection device 20 and are designed to be wear-resistant for example by having a ceramic lining.

(46) This means in the embodiments shown in FIGS. 2a, 2b and 2c of a twisting plate 8a, 8b, 8c both the eyelet 23 and also the closed channel 25 or the slot 24 open at the bottom form respectively a fixed throw-off point 21 for the yarn deflection device 20.

(47) The FIGS. 3a, 3b and 3c show different embodiments of a yarn deflection device 20 designed as a twisting blade 22 and equipped with a fixed throw-off point 21.

(48) The twisting blade 22a shown in FIG. 3a comprises for example a main body 33 designed in the form of a hub on which a blade-like shoulder 34 is formed which is equipped in its end section 35 with an eyelet 23 which is preferably made from wearing-resistant material, for example ceramic.

(49) As known from the twisting plate 8a, the eyelet 23 also functions here as a fixed throw-off point 21 for the yarn deflection device 20.

(50) Furthermore, in the region of the axis of rotation 28 of the spindle 2 or its main body 33 the twisting blade 22a also has an axially running yarn guiding bore 31 and a yarn exit bore 29 branching radially from the latter.

(51) Preferably, the main body 33 of the twisting blade 22a or the blade-like shoulder 34 is also provided with a counterweight 36, which during the operation of the twisting blade 22a balances the centrifugal forces created by the blade-like shoulder 34.

(52) Instead of a counterweight it would however also be possible to arrange a second opposite blade-like shoulder.

(53) As with the twisting plate 8a when using a twisting blade 22a during the operation of the spindle 2 the outer yarn 5 coming from the first feed package 7 over an axial yarn guiding bore 31 arranged in the region of the axis of rotation 28 of the spindle 2 runs into the twisting blade 22a and via a yarn exit bore 29 branching radially from the axial yarn guiding bore 31 to a wear-resistant eyelet 23 arranged in the end section 35 of the blade 34.

(54) The outer yarn 5 traversing the eyelet 23 is also rotated by the rotating twisting blade 22a and thereby forms a yarn balloon B, which is reduced to a minimum with respect to its diameter.

(55) The twisting blade 22b shown in FIG. 3b also comprises in the region of the axis of rotation 28 of the spindle 2 an axially running yarn guiding bore 31 as well as a yarn bore 29 branching off the latter radially, to which a linear yarn guiding device leading to the end section 35 of the blade 34 is connected.

(56) The linear yarn guiding device is either designed, as shown as in FIG. 3b by way of the twisting blade 22b, as a closed channel 25 or, as shown in FIG. 3c by way of the twisting blade 22c as a slot 24 open at the bottom.

(57) The outlet point of the channel 25 or slot 24 thereby form a fixed throw-off point 21 for the yarn deflection device 20 designed as a twisting blade 22b or 22c.

(58) FIG. 4 shows as an alternative embodiment a yarn deflection device 20 designed as a barrel tensioner 26.

(59) A construction of this kind comprises a hub-like main body 37, to which a plate-like shoulder 38 is connected.

(60) The barrel tensioner 26 also has in the region of the axis of rotation 28 of the spindle 2 an axially running yarn guiding bore 31, from which a yarn exit bore 29 branches off radially, which ends in the region of the casing surface 39 of the main body 37.

(61) On the side opposite the yarn exit bore 29 the plate-like shoulder 38 of the barrel tensioner 26 is equipped with an eyelet 23, which is preferably made from wear-resistant material, for example ceramic, and which functions as a fixed throw-off point 21 for the yarn deflection device 20.

(62) This means that during the operation of the spindle 2 the outer yarn 5 coming from the first feed package 7 runs via the yarn guiding bore 31 into the main body 37 of the barrel tensioner 26 and via the radially arranged yarn exit bore 29 onto the casing surface 39 of the hub-like main body 37. The outer yarn 5 leaves the main body 37 after wrapping for example about 120 in the direction of the wear-resistant eyelet 23, which is arranged in the region of the plate-like shoulder 38 of the barrel tensioner 26 and which rotates with the barrel tensioner 26.

(63) The outer yarn 5, which by means of its partial wrapping of the hub-like main body 37 of the barrel tensioner 26 is given an additional yarn tension, is also rotated by the rotating eyelet 23 and forms a yarn balloon B, which is minimised with respect to its diameter.

(64) It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of a broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiment, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.