WO2017046218A2

WO2017046218A2 - Device and method for making of a stretch yarn

Info

Publication number: WO2017046218A2
Application number: PCT/EP2016/071784
Authority: WO
Inventors: Hans Wullschleger; Christian FINKEN
Original assignee: Amsler Tex Ag
Priority date: 2015-09-18
Filing date: 2016-09-15
Publication date: 2017-03-23
Also published as: EP3350364A2; WO2017046218A3; CN107923075A

Abstract

The invention is directed to a ring spinning device (1) for making of a stretch yarn (28), comprising a drafting arrangement (2). The drafting arrangement (2) comprises a pair of entry rollers (3, 4), a pair of delivery rollers (6, 7) arranged downstream with respect to the entry rollers (3, 4), and a pair of intermediate rollers (11, 12) arranged between the entry rollers (3, 4) and the delivery rollers (6, 7). The ring spinning device further comprises a first supply (29) to supply a first roving (15) between the pair of entry rollers (3, 4), a second supply (30) to supply a second roving (14) between the intermediate rollers (11, 12) and a third supply (31) to supply an elastic performance filament (16) between the delivery rollers (6, 7). The first roving (15) and the second roving (14) and the elastic performance filament (16) are spun into the stretch yarn (28) in a spinning triangle (29) after exit of the drafting arrangement (2).

Description

DEVICE AND METHOD FOR MAKING OF A STRETCH YARN

FIELD OF THE INVENTION

The present invention is directed to a device and a method for making of a stretch yarn. BACKGROUND OF THE INVENTION

In order to produce so called fancy/effect yarns, discontinuous injection of fibers during the spinning process in order to produce slubs is known.

DE4041 301 was published in 1 992 and shows an improved spinning device for generating effect yarn. The drafting arrangement and the delivery unit have drafting and delivery cylinders connected to drives which can be adjusted individ ually by means of a program control. The drive of each drafting cylinder is separated mechanically from the main drive of the spinning machine. In this device, the blazes are generated by means of an overfeed by the delivery cylinder of the drafting arrangement.

EP1 602756 was disclosed in 2005 and shows a method and a device for producing a fancy yarn with a predefined thickness profile of a blaze. To generate an effect, the rotational speed of a pair of ^"front rollers^" and/or a group of ^"back rollers^" is changed from a reference speed to a predefined speed and then reset to the reference speed again. The pair of ^"front rollers^" and the group of ^"back rollers^" are driven by different motors. Another approach is using twisted yarn ( using two twisted yarns) where colored fibers are injected in the drafting arrangement. Thus, high quality fancy yarns with highly reproducible slubs can be obtained .

EP21 22022 was published in 2009 and discloses a ring spinning machine having at least two support yarns which are twisted together and fibers of a roving which are introduced by means of a drafting arrangement. A support yarn hold ing device accommodates at least one support yarn package per drafting arrangement of a spinning site. A support yarn guide feeds in at least two support yarns which are at a distance from one another, in the region of a pair of rollers which are disposed in front of a spinning triangle.

EP2038458 was disclosed in 2009 and shows a spinning device for producing fancy yarn consisting of a spun yarn that has thickenings. The spinning device has an the actuator which is configured such that it allows an abrupt stopping and acceleration of the pair of delivery rollers with respect to a belt wherein fibers conveyed by the belt can be guided, in the draft state, directly in front of the delivery roller nip and can be temporarily built up at at least one delivery roller in such a way that the length of the resulting thickenings is shorter than a staple length of the conveyed fibers.

The fancy yarns known from the prior art are not stretchable. SUMMARY OF THE INVENTION

Traditional stretch yarns, in particular fancy stretch yarns, often are relatively expensive as they require complicated and expensive apparatus to be produced from multiple thin and consequently relatively expensive per weight unit pre-yarns which have to be plied in order to be able to arrange them in the spinning frame. A major problem is that injection of the effects may critically disturb the spinning process. In particular variation of the amount of effect roving, e.g. by injection of fibers, typically leads to a shifting of the elastic performance filament, which actually has to be centered with respect to the at least one foundation ( basic) roving and the effect roving in order to obtain a proper yarn in the spinning process. If this is not the case, the elastic performance filament may protrude the resulting stretch yarn's surface.

One object of the present invention is to provide an improved stretch yarn which offers the ability to incorporate slubs ( respectively rovings) of the same or different colors. A further object of the present invention is to provide a fabric comprising such a stretch yarn. A further object of the invention is to provide a method to produce such a stretch yarn. A still further object of the invention is to provide a device for making a stretch yarn according to the invention.

In order to solve at least one of the aforementioned problems, a ring spinning device for making of stretch yarn according to the present invention typically comprises a drafting arrangement which comprises a pair of entry rollers, a pair of delivery rollers arranged downstream with respect to the entry rollers and a pair of intermed iate rollers arranged between the entry rollers and the delivery rollers. Downstream relates to the movement of the rovings (fibers) from their supply through the drafting arrangement to the spinning triangle of the ring spinning machine. The ring spinning machine according to the invention usually further comprises a first supply to supply a first roving between the pair of entry rollers, a second supply to supply a second roving between the intermediate rollers and a third supply to supply an elastic performance filament between the delivery rollers. According to the invention, the first roving and the second roving and the elastic performance filament are spun into the stretch yarn in a spinning triangle after exit of the drafting arrangement. In order to make high quality yarn, the intermed iate rollers may during production rotate at a lower speed than the delivery rollers, such that a draft is applied to the first and the second roving between the intermediate rollers and the delivery rollers.

Alternatively or in addition, a pair of pre-drafting rollers may be arranged between the pair of entry rollers and the pair of intermediate rollers. These pre-drafting rollers may rotate at a lower speed than the intermediate rollers, such that the first and/or the second roving may be pre-drafted before entering the zone between the intermediate rollers and the delivery rollers.

The first, the second and the third supply may e.g. comprise bobbins arranged at the spinning frame of the ring spinning machine as well as deflectors and/or rollers arranged between the spinning frame and the drafting arrangement in order to precisely supply the rovings and /or the elastic performance filament into the spinning process.

Alternatively or in addition a belt may be arranged at the intermediate rollers, configured to transport the first and the second roving downstream in a pinched manner. Good results may be obtained if two belts are arranged at the intermediate rollers, as will be shown in further detail below.

For some applications, the entry rollers may be driven relatively to the delivery rollers at a variable rotational speed such that the first roving is introduced to the intermediate rollers in a discontinuous manner. Hence some types of fancy/effect stretch yarns can be produced. Depending on the result to be achieved, the rotational speed of the entry rollers may change up to 1 00% compared to rotational speed of the delivery rollers. The entry rollers may completely stop or if appropriate, even temporarily change the direction of rotation. Thus, new and very accurate effects can be obtained. A first deflector may be arranged between the entry rollers and the intermediate rollers to position at least one of the rovings with respect to the spinning triangle. Hence surface quality of the stretch yarn can be improved. Good results may be obtained if the first deflector comprises a first opening (first eye) for guiding of the first roving and a second opening (second eye) for guiding of the second roving spaced a certain distance apart from each other. For some applications, the first deflector may be a condenser, such as a Siro-type condenser.

If appropriate the third supply comprises a supply roller arranged in a vertical direction above and/or in front of the delivery rollers. Thereby, the elastic performance filament may be positioned very accurately before being supplied to the delivery unit.

In order to reduce wastage at least one trimming device may be present for interrupting the supply of the second roving and/or the first roving in the case of breakage of the elastic performance filament. Good results may be obtained if the trimming device is actuated mechanically and/or electrically.

In order to prevent misalignment of the first and second roving with respect to the elastic performance filament very efficiently, especially during application of an effect, a second deflector may be arranged between the intermediate rollers and the delivery rollers to position the first and/or the second roving with respect to the spinning triangle in a lateral direction (direction of the axes of rotation of the delivery rollers). If required the same or an additional second deflector may be arranged between the intermediate rollers and the delivery rollers to position the elastic performance filament with respect to the spinning triangle in the lateral direction. Good results can be obtained if the second deflector comprises a guiding edge arranged to support the first and/or the second roving and/or the elastic performance filament in a lateral direction. Alternatively or in addition the second deflector may comprise a chamfer and/or fillet and/or at least one roll preventing negative deflection in said direction. For some applications - e.g. in order to facilitate visual monitoring of the drafting arrangement - the second deflector may be made from a transparent material, such as a transparent plastic material.

A stretch yarn with a very good surface quality may be obtained if the first deflector, the second deflector and the supply roller are adjusted such that the elastic performance filament in the final product is arranged in the center of the stretch yarn fully covered by the fibers of the first and the second roving. For some applications, the first and the second deflector and the supply roller for the filament are arranged within a distance of 0.5 mm to 2 mm with respect to a plane arranged perpendicular to the axis of rotation of the delivery rollers.

In order to prevent local wear of the rollers, the first and/or second deflector and/or the supply roller may be interconnected to a traversing rail such that during production it/they are period ically deflected in lateral direction in such a way that the rollers of the drafting arrangement are not worn on one side.

Fast and easy adaptation to a variety of rovings and/or elastic performance filaments may be obtained if the position of at least one of the supplies and/or at least one of the deflectors is adjustable with respect to the rollers of the drafting arrangement.

A method for making of a stretch yarn in a ring spinning device typically comprises the following method steps: Supplying a first roving by a first supply to a pair of entry rollers of a drafting arrangement; supplying a second roving by a second supply to a pair of intermediate rollers of the drafting arrangement arranged downstream with respect to the entry rollers; supplying an elastic performance filament to a pair of delivery rollers of the drafting arrangement arranged downstream with respect to the intermediate rollers; spinning the first roving, the second roving and the elastic performance filament into the stretch yarn in a spinning triangle after exit of the drafting arrangement by the delivery rollers.

For some applications the intermediate rollers may, during production, rotate at a lower speed than the delivery rollers, such that a draft is applied to the first and the second roving between the intermediate rollers and the delivery rollers. Alternatively or in addition the first and the second roving may be guided by two belts which are arranged at the intermediate rollers, configured to transport the first and the second roving downstream in a pinched manner. For some applications, only one belt may be present.

In order to induce some types of fancy stretch yarns, the entry rollers may rotate relatively to the delivery rollers at a variable speed such that the first roving is introduced to the intermediate rollers in a discontinuous manner.

In order to improve yarn quality a first deflector may be arranged between the entry rollers and the intermediate rollers positions at least one of the rovings with respect to the spinning triangle. For some applications, during production the first roving may move through a first opening and the second roving may move through a second opening for guiding of spaced a certain distance apart from each other.

In order to prevent local wear of the rollers, the first, the second and the third supply may sway back and forth in a transversal direction with respect to the movement of the rovings and the elastic performance filament, thereby reducing local wear of the rollers, as also described above. Another object of the present invention is to provide a stretch yarn made by a method as described above. For some applications, the elastic performance filament may be covered by the fibers of the first and/or the second roving which are wound around the elastic performance filament. The first roving may comprises synthetic and/or natural fibers. As well, the second roving comprises synthetic and /or natural fibers.

A stretch yarn with particularly good elastic performance may be obtained if the amount of elastic performance filament is approximately 4% to 6 % of all components of the stretch yarn. For some applications, the elastic performance filament may be a spandex (e.g. Lycra ) filament or an elastolefin (e.g. Lastol) or an elastoester or a synthetic rubber filament.

One object of the present invention is to provide a fabric comprising a stretch yarn as described above. The fabric may be a jersey-type fabric. A woven fabric may be made from a stretch yarn as described above.

Another object of the present invention is to provide a first deflector for a ring spinning device which comprises a first and a second opening, the first opening (first eye) for guiding of a first roving and a second opening (second eye) for guiding of a second roving spaced a certain distance apart from each other, whereby the distance between the first opening and the second opening can be altered. Thus, various types of first and second rovings can be processed. Hence, using such a first deflector for a ring spinning device for making of a stretch yarn as described herein allows to process a large variety of rovings in order to produce various types of yarns. It will be appreciated that such a first deflector is an independent inventive concept that can be advantageous regardless of the type of spinning device that is used . For some applications the first deflector may comprise a third opening for guiding of the second roving or a third roving spaced a certain distance apart from the second opening. Such embodiments of a first deflector may e.g. be used for paired drafting devices.

A first deflector that allows to process a particularly large variety of roving types may be obtained if it comprises a deflector base and a deflector slide, wherein the first opening is arranged at the deflector base and the second opening is arranged at a deflector slide, wherein the deflector slide can be displaced relative to the deflector base, as will be explained in more detail below.

BRIEF DESCRIPTION OF THE DRAWINGS The herein described invention will be more fully understood from the detailed description of the given herein below and the accompanying drawings, which should not be considered as limiting to the invention described in the appended claims. schematically shows a portion of variation of a ring spinning device according to the invention in a first perspective view; Fig. 2 shows the ring spinning device of Fig. 1 in a lateral view;

Fig. 3 shows the ring spinning device of Fig. 1 in a second perspective view;

Fig. 4 shows detail A of Fig. 3 ;

Fig. 5 shows the area shown in Fig. 4 in a view from the bottom;

Fig. 6 shows a variation of a second deflector in a perspective view; Fig. 7 schematically shows a variation of an elastic yarn according to the invention;

Fig. 8 schematically shows a drafting arrangement for a ring spinning device according to the invention;

Fig. 9 schematically shows a drafting arrangement for a ring spinning device according to invention;

Fig. 1 0 schematically shows an embodiment of a first deflector according to the invention in a first perspective view;

Fig. 1 1 shows the first deflector of Fig. 1 0 in a second perspective view;

Fig. 1 2 shows the first deflector of Fig. 1 0 in a frontal view;

Fig. 1 3 shows the first deflector of Fig. 1 0 with displaced deflector slide in a frontal view;

Fig. 1 4 shows another embodiment of a first deflector in a perspective view. DETAILED DESCRIPTION OF THE INVENTION

The foregoing summary, as well as the following detailed description of the preferred embodiments, is better understood when read in conjunction with the appended drawings. For the purposes of illustrating the invention, an embodiment that is presently preferred, in which like numerals represent similar parts throughout the several views of the drawings, it being understood, however, that the invention is not limited to the specific methods and instrumentalities disclosed. Figs. 1 to 3 schematically show a drafting arrangement 2 of a variation of a ring spinning device 1 according to the invention. The drafting arrangement 2 comprises a pair of a first and a second entry roller 3 , 4 between which a first roving 1 5 is supplied from a first supply 29. The drafting arrangement further comprises a pair of first and second delivery rollers 6, 7 that are arranged downstream with respect to the entry rollers 3 , 4. An elastic performing filament 1 6 is supplied from a third supply 3 1 between the first and second delivery rollers 6, 7. Between the entry rollers 3 , 4 and the delivery rollers 6, 7 a pair of a first and a second intermediate rollers 1 1 , 1 2 is arranged, between which a second roving 1 4 is supplied from a second supply 30.

The first entry roller 3 is driven via a first drive shaft 5, whereby the second entry roller 4 is pressed against the first entry roller 3 and driven passively via the first entry roller 3. The first delivery roller 6 is driven by a second drive shaft, whereas the second delivery roller is pressed against the first delivery roller 6 and driven passively via the first delivery roller 6. The first intermediate roller 1 1 is driven by a third drive shaft 1 3 and drives a first belt 9 which is tensioned ( in the front region ) by a first belt guide. A second belt 1 0 is arranged such that it is passively driven by the first belt 9 and tensioned by the second belt intermediate roller 1 2 and a second belt guide. Between the two belts 9, 1 0 the first and second rovings 1 5, 1 4 are transported in a pinched manner.

The intermediate rollers 1 1 , 1 2 are rotating at a lower speed than the delivery rollers 6, 7 such that a draft is applied to the first and second roving 1 5, 1 4 between these pairs of rollers. The entry rollers 3 , 4 are relatively to the delivery rollers 6, 7 driven at a variable rotational speed such that the first roving 1 5 is introduced to the intermediate rollers 1 1 , 1 2 in a discontinuous manner. Thus, the amount of first roving material present in the resulting stretch yarn 28 varies along the length of the stretch yarn 28. Consequently, the diameter and/or color of the resulting stretch yarn 28 can be varied along the yarn axis. As e.g. shown in Fig. 2 and Fig. 8 a first deflector 1 8 is arranged between the entry rollers 3 , 4 and the intermediate rollers 1 1 , 1 2. The first deflector 1 8 comprises a first opening (eye) 1 8a for guiding the first roving 1 5 and a second opening (eye) 1 8b for guiding the second roving 1 4, spaced a certain distance apart from each other, as will be shown in more detail in Fig. 5 and schematically in Fig. 8 and Fig. 9. At the same time, the first deflector 1 8 positions both rovings 1 5, 1 4 with respect to the spinning triangle 24. However, in other variations of the invention only the first or the second roving 1 5, 1 4 may be positioned with respect to the spinning triangle 24.

The first deflector 1 8 is arranged at a carrier 27 which itself is mechanically interconnected with a traversing rail 26 that is periodically deflected in direction y of the axes of rotation of the pair of delivery rollers 6, 7 in such a way that the rollers of the drafting arrangement are not worn on one side.

The variation of a ring spinning device as shown in Fig. 1 to Fig. 3 also comprises a supply roller 21 that is part of the third supply 3 1 and is arranged in a vertical direction (z) above the delivery rollers 6 , 7. The supply roller positions the elastic performance filament 1 6 with respect to the spinning triangle 24. In the variation of the invention shown, the supply roller 21 is arranged at a pivotable arm 20 that is mechanically interconnected with the traversing rail 26, such that it performs the same type of periodical deflection in direction y as the first deflector 1 8.

As also shown in Fig. 1 to Fig. 5, the variation of the invention shown also comprises a second deflector 1 7 which is arranged between the intermed iate rollers 1 1 , 1 2 and the delivery rollers 6, 7 and which positions the first and the second roving 1 5 , 1 4 with respect to the spinning triangle 24 in a lateral direction y. In the variation shown, the second deflector 1 7 is mechanically interconnected with the pivotable arm 20 such that it performs the same type of periodical deflection in d irection y as the first deflector 1 8 and the supply roller 21 . Hence the positions of the first and the second deflector 1 8, 1 7 and the supply roller 21 relative to each other during the periodical deflection of the traversing rail 26 are constant. As shown in Fig. 4 and Fig. 5, the first and second roving 1 5, 1 4 may be deflected laterally y by the second deflector 1 7 such that elastic performance filament is arranged in the center of the stretch yarn 28 ( indicated in Fig. 4). During such deflection, the distance between the first and the second roving 1 5, 1 4 may be reduced, as indicated in Fig. 5. In order to obtain proper deflection, the second deflector 1 7 may comprise a chamfer 1 7a and associated guiding edge 1 7b, as shown in Fig. 4, Fig. 5 and Fig. 6.

Fig. 7 schematically shows a variation of a stretch yarn 28 according to the invention which comprises an elastic performance filament 1 6 arranged in the center of the stretch yarn 28. The elastic performance filament 1 6 is covered by the fibers of the first and the second roving 1 5, 1 4 which are wound around the elastic performance filament 1 6. The thickness of the bundle of fibers of the first roving 1 5 varies along the length of the stretch yarn 28, causing alternations in color and diameter of this variation of a stretch yarn 28 along the length of the stretch yarn 28.

Fig. 8 schematically shows a variation of drafting arrangement 2 of a ring spinning machine 1 according to the invention. As shown , the first and the second roving 1 5, 1 4 pass a first, respectively second opening 1 8a, 1 8b of a first deflector 1 8 and thereby are positioned with respect to the spinning triangle 24 at a certain distance in direction of the axis of rotation of the first delivery roller 6. The first deflector comprises a first opening 1 8a which guides the first roving 1 5 that is supplied by a first supply 29 , as well as a second opening 1 8b which guides a second roving 1 4 that is supplied by a second supply 30. The two openings 1 8a, 1 8b guide the first and the second roving 1 5, 1 4 such that they are spaced a certain distance apart from each other, while they pass the pair of intermediate rollers 1 1 , 1 2. Between the intermed iate rollers 1 1 , 1 2 and the delivery rollers 6, 7 a second deflector 1 7 is arranged which deflects the first and the second roving 1 5, 1 4 such that they get positioned/aligned with respect to the spinning triangle 24 in a lateral direction y. Thus, both rovings 1 5, 1 4 can be aligned very accurately with respect to the elastic performance filament that is supplied to the pair of delivery rollers 6, 7. In order to obtain easy and at the same time also accurate positioning of the elastic performance filament 1 6 with respect to the rovings 1 5, 1 4, the elastic performance filament 1 6 is supplied to the delivery rollers 6, 7 via a supply roller 21 . Hence proper positioning of the first and the second roving 1 5, 1 4 as well as the elastic performance filament 1 6 with respect to each other can be obtained by positioning the supply roller 21 and second deflector 1 7 relatively to each other.

As schematically shown in Fig. 9, a variation of a ring spinning device according to the invention may comprise a system to prevent local wear of the rollers, which may be arranged at a traversing rail 26. In Fig. 9 two adjacent drafting arrangement 2 are shown. The traversing rail 26 is periodically deflected ( movement F) in direction y, whereas the rollers 3 , 4, 1 1 , 1 2, 6, 7 are stationary (e.g. with respect to the floor) . The first deflectors 1 8 of both drafting arrangements 2 are mounted on a carrier 27 that is fastened to the traversing rail 26 and hence also performs movement F. As well, each of the drafting arrangements 2 comprises an arm 20 that is fastened to the traversing rail 26 and follows movement F. Second deflectors 1 7 and supply rollers 21 for the elastic performance filaments ( not shown ) are arranged at the arms 20 and consequently also do the same movement F. The supply rollers 21 , second deflectors 1 7 and first deflectors 1 8 are arranged with respect to each others such that after passing the intermediate rollers 1 1 , 1 2, the first and second rovings 1 5, 1 4 are accurately aligned with the elastic performance filament while being deflected by guiding edges 1 7b of the second deflectors.

Figs. 1 0 to 1 3 show a possible embodiment of a first deflector 1 8 for being used in a ring spinning device ( not shown ) according to the present invention. However, it will be appreciated that such a type of first deflector 1 8 is an independent inventive concept, independent of the aforementioned ring spinning device. The shown embodiment of a first deflector 1 8 has a deflector base 32 which comprises a connecting means 34 in order to mechanically interconnect the first deflector 1 8 with the ring spinning device ( not shown in detail) . I n the embodiment shown, the connecting means 34 is formed as a clamping means which allows the first deflector 1 8 being clamped to e.g. a corresponding beam of a carrier ( not shown ) arranged at the ring spinning device. The deflector base 32 comprises a first opening 1 8a which - as shown - may be essentially funnel-shaped such that a condensing effect can be obtained - if desired. As e.g. shown in Fig. 1 2, the first opening 1 8a may have a non -circular cross-section (v/w-plane). In the embodiment shown, the cross-section of the first opening 1 8a has a tapered cross-section which allows more accurate, respectively well-defined, alignment of the first roving ( not shown ) when it leaves the first opening 1 8a. The first deflector 1 8 shown in Figs. 1 0 to 1 3 also comprises a deflector slide 33 which is arranged on top of the deflector base 32. Deflector base 32 and deflector slide 33 are mechanically interconnected by means of a fastening means 35. I n the embodiment of a first deflector 1 8 shown, the fastening means 35 comprises a screw which is arranged in an elongated opening ( not visible) of the deflector slide 33 and is fastened to the deflector base 32. As e.g. illustrated in Fig. 1 2 and Fig. 1 3, corresponding teeth 36a, 36b are arranged at the deflector base 32, respectively the deflector slide 33. When the screw of the fastening means 35 is fastened, the teeth 36a of the deflector base 32 and the teeth 36b of the deflector slide 33 interlock, pre- venting relative translations and rotations between deflector base 32 and deflector slide 33 , as shown in Fig. 1 2. The deflector slide 33 of the embod iment shown comprises a second and a third opening 1 8b, 1 8c, which are both formed as recesses in order to receive a second roving ( not shown ). The deflector slide 33 comprises deflection faces 39b, 39c that ensure proper deflection of a second roving 1 4 ( not shown ). As well, the deflector slide 33 comprises a retainer 38 that is arranged such that proper alignment of a second roving 1 4 with respect to the deflection faces 39b, 39c is ensured. As shown in Fig. 1 3, the deflector slide 33 can be displaced in lateral direction (v-direction ) with respect to the deflector base 32, allowing to vary the distance ( in v-direction ) between the first and the second opening 1 8a, 1 8b. In the embodiment shown, such a displacement can be obtained by loosening the fastening means 35 such that the d istance between deflector base 32 and deflector slide can be increased (w-direction ), leading to a separation of the teeth 36a, 36b which consequently do not interlock anymore. Thus the deflector slide 33 can be displaced with respect to the deflector base 32 in lateral direction (v-direction ) by a certain value d, leading to an increased separation between the first and the second opening 1 8a, 1 8b, as shown in Fig. 1 3. In the embodiment shown in Fig. 1 0 to Fig. 1 3 , the deflector slide 33 can be laterally displaced in both directions ( negative and positive v-direction ), hence both openings 1 8b, 1 8c of the deflector slide 1 8 may be used as a second opening. Hence, the embodiment of a first deflector 1 8 shown can be used for both sides of paired drafting devices, such as illustrated in Fig. 9. However, for paired drafting devices, also specific, respectively different, types of first deflectors may be used for the two adjacent drafting arrangement, as shown in Fig. 1 0 and Fig. 1 4. It is clear that a first deflector 1 8 according to the invention may also comprise a deflector slide 33 that has only one second opening 1 8b arranged to receive a second roving 1 4. As indicated in Fig. 1 1 , the first deflector 1 8 may comprise a scale reading 37 that indicates the alignment of deflector base 32 and deflector slide 33. Such a scale reading 37 may help to obtain proper alignment of the deflector slide 33 with respect to the deflector base 32. An embodiment of a first deflector 1 8 as shown in Fig. 1 0 to Fig. 1 3 may also be used for SI RO-type spinning, e.g. using the second and the third opening 1 8b, 1 8c for the rovings.

REFERENCE NUMERALS

1 Ring spinning device 18b Second opening (second eye)

2 Drafting arrangement 25 18c Third opening (third eye)

3 First entry roller 20 Arm (pivotable)

5 4 Second entry roller 21 Supply roller (for the elastic

5 First drive shaft performance filament)

6 First delivery roller 24 Spinning triangle

7 Second delivery roller 30 26 Traversing rail

8 Second drive shaft 27 Carrier

10 9 First belt 28 Stretch yarn

10 Second belt 29 First supply

11 First intermediate roller 30 Second supply

12 Second intermediate roller 35 31 Third supply

13 Third drive shaft 32 Deflector base

15 14 Second roving (foundation) 33 Deflector slide

15 First roving (effect) 34 Connecting means

16 Elastic performance filament 35 Fastening means

17 Second deflector (guide fin40 36a, b Teeth

ger/blade) 37 Scale reading

20 17a Chamfer 38 Retainer (pin)

17b Guiding edge 39b,c Deflection face

18 First deflector

18a First opening (first eye)

Claims

1. Ring spinning device (1 ) for making of a stretch yarn (28), comprising a. a drafting arrangement (2) comprising i. a pair of entry rollers (3, 4), ii. a pair of delivery rollers (6, 7) arranged downstream with respect to the entry rollers (3,4), and iii. a pair of intermediate rollers (11, 12) arranged between the entry rollers (3, 4) and the delivery rollers (6, 7), and b. a first supply (29) to supply a first roving (15) between the pair of entry rollers (3, 4), c. a second supply (30) to supply a second roving (14) between the intermediate rollers (11, 12) and d. a third supply (31) to supply an elastic performance filament (16) between the delivery rollers (6, 7), wherein e. the first roving (15) and the second roving (14) and the elastic performance filament (16) are spun into the stretch yarn (28) in a spinning triangle (29) after exit of the drafting arrangement (2) by the delivery rollers (6, 7).

2. The ring spinning device ( 1 ) according to claim 1 , wherein the intermediate rollers (11, 12) during production are rotating at a lower speed than the delivery rollers (6, 7), such that a draft is applied to the first and the second roving (15, 14) between the intermediate rollers (11, 12) and the delivery rollers (6, 7).

3. The ring spinning device (1 ) according to one of the preceding claims, wherein a pair of belts (9) is arranged at the intermediate rollers (11, 12), configured to move the first and the second roving (15, 14) downstream in a pinched manner.

4. The ring spinning device ( 1 ) according to one of the preceding claims, wherein the entry rollers (3, 4) are relatively to the delivery rollers (6, 7) driven at a variable speed such that the first roving (15) is introduced to the intermediate rollers (11, 12) in a discontinuous manner.

5. The ring spinning device (1 ) according to claim 4, wherein the rotational speed of the entry rollers (3, 4) changes of up to 100% compared to the rotational speed of the delivery rollers (6, 7).

6. The ring spinning device (1 ) according to one of the preceding claims, wherein a first deflector (18) is arranged between the entry rollers (3, 4) and the intermediate rollers (11, 12) to position at least one of the rovings (15, 14) with respect to the spinning triangle (24).

7. The ring spinning device ( 1 ) according to claim 6, wherein the first deflector ( 18) comprises a first opening ( 18a) for guiding of the first roving (15) and a second opening (18b) for guiding of the second roving (14) spaced a certain distance apart from each other.

8. The ring spinning device ( 1 ) according to any of the preceding claims, wherein the third supply (31) comprises a supply roller (21) arranged in a vertical direction above the delivery rollers (6, 7).

9. The spinning device ( 1 ) according to any of the preceding claims, wherein a trimming device is present for interrupting the supply of the second roving (14) in the case of breakage of the elastic performance filament (16).

10. The ring spinning device (1 ) according to claim 9, wherein the trimming device is actuated mechanically and/or electrically.

11. The spinning device ( 1 ) according to one of the preceding claims, wherein a second deflector (17) is arranged between the intermediate rollers (11, 12) and the delivery rollers (6, 7) to position the first and the second rovings (15, 14) with respect to the spinning triangle (24) in a lateral direction (y).

12. The ring spinning device ( 1 ) according to claim 11 , wherein the second deflector (17) comprises a guiding edge ( 17b) arranged to support the first and /or the second roving (15, 14) and/or the elastic performance filament (16) in a lateral direction (y).

13. The ring spinning device ( 1 ) according to claims 7, 8 and one of claims 11 and 12, wherein the first deflector (18), the second deflector (17) and the supply roller (21 ) are arranged such that the elastic performance filament (16) is arranged in the center of the stretch yarn (28) fully covered by the fibers of the first and the second roving (15, 14).

14. The ring spinning device ( 1 ) according to claim 13, wherein the first and the second deflector (18, 17) and the supply roller (21 ) are arranged within a distance of 0.5 mm to 2 mm with respect to a plane arranged perpendicular to the axis of rotation of the delivery rollers (6, 7).

15. The ring spinning device ( 1 ) according to one of the preceding claims, wherein the first and/or second deflector (18, 17) and/or the supply roller (21) is/are interconnected to a traversing rail (26) such that during production it/they are periodically deflected (F) in lateral direction (y) in such a way that the rollers (3, 4, 11 , 12, 6, 7) of the drafting arrangement (2) are not worn on one side.

16. The ring spinning device ( 1 ) according to one of the preceding claims, wherein the position of at least one of the supplies (29, 30, 31 ) and/or at least one of the deflectors ( 18, 17) is adjustable with respect to the rollers (3, 4, 11, 12, 6, 7) of the drafting arrangement (2).

17. A second deflector (17) for a ring spinning machine (1 ) according to one of the preceding claims, wherein the second deflector (17) comprises a chamfer and/or fillet (17a) arranged to deflect the first and/or second roving (15, 14).

18. The second deflector (17) according to claim 17, wherein the second deflector (17) comprises a guiding edge ( 17b) to support the first and/or second roving (15, 14) in the lateral (y) direction.

19. Method for making of a stretch yarn (28) in a ring spinning device (1 ) comprising the following method steps: a. supplying a first roving (15) by a first supply (29) to a pair of entry rollers (3, 4) of a drafting arrangement (2); b. supplying a second roving (14) by a second supply (30) to a pair of intermediate rollers (11, 12) of the drafting arrangement (2) arranged downstream with respect to the entry rollers (3, 4); and c. supplying an elastic performance filament ( 16) to a pair of delivery rollers (6, 7) of the drafting arrangement (2) arranged downstream with respect to the intermediate rollers (11, 12); and d. spinning the first roving (15), the second roving ( 14) and the elastic performance filament (16) into the stretch yarn (28) in a spinning triangle (24) after exit of the drafting arrangement (2) by the delivery rollers (6, 7).

20. The method according to claim 19, wherein the intermediate rollers (11, 12) during production rotate at a lower speed than the delivery rollers (6, 7), such that a draft is applied to the first and the second roving (15, 14) between the intermediate rollers (11, 12) and the delivery rollers (6, 7).

21. The method according to claim 19 or claim 20, wherein the rovings (14, 15) are guided by two belts (9, 10) which are arranged at the intermediate rollers (11, 12), configured to transport the first and the second roving (15, 14) downstream in a pinched manner.

22. The method according to one of claims 19 to 21 , wherein the entry rollers (3, 4) rotate relatively to the delivery rollers (6, 7) at a variable speed such that the first roving (15) is introduced to the intermediate rollers (11, 12) in a discontinuous manner.

23. The method according to one of claims 19 to 22, wherein a first deflector (18) arranged between the entry rollers (3, 4) and the intermediate rollers (11, 12) positions at least one of the rovings (15, 14) with respect to the spinning triangle (24).

24. The method according to claim 23, wherein during production the first roving (15) moves through a first opening ( 18a) and the second roving ( 14) moves through a second opening ( 18b) of the first deflector ( 18) for guiding of spaced a certain distance apart from each other.

25. The method according to any of claims 19 to 24, wherein the first, the second and the third supply (29, 30, 31 ) may sway back and forth in a transversal direction with respect to the movement of the rovings and the elastic performance filament, thereby reducing local wear of the rollers (3, 4, 11 , 12, 6, 7).

26. Stretch yarn (28) made by a ring spinning machine according to one of the claims 1 to 16.

27. Stretch yarn (28) made by a method according to one of the claims 19 to 25.

28. The stretch yarn (28) according to one of the claims 26 or 27, wherein the elastic performance filament (16) is covered by the fibers of the first and/or the second roving (15, 14) which are wound around the elastic performance filament (16).

29. The stretch yarn (28) according to one of claims 26 to 28, wherein the first roving (15) comprises synthetic and/or natural fibers.

30. The stretch yarn (28) according to one of claims 26 to 29, wherein the second roving ( 14) comprises synthetic and /or natural fibers.

31. The stretch yarn (28) according to one of claims 26 to 30, wherein the elastic performance filament (16) is in the range of 4% to 6% of all components of the stretch yarn.

32. The stretch yarn according to one of claims 26 to 31 , wherein the elastic performance filament (16) is a spandex filament or a lastol filament.

33. A knitted fabric comprising a stretch yarn according to one of claims 26 to 32.

34. The knitted fabric according to claim 33, wherein the knitted fabric is a jersey-type fabric.

35. A woven fabric comprising a stretch yarn according to one of claims 26 to 32.

36. A first deflector ( 18) for a ring spinning device according to one of claims 7 to 16, wherein the distance between the first opening (18a) and the second opening (18b) can be altered.

37. The first deflector (18) according to claim 36, wherein the first deflector (18) comprises a third opening (18c) for guiding of the second roving (14) spaced a certain distance apart from the second opening (18b).

38. The first deflector (18) according to one of claims 36 or 37, wherein the first de- flector (18) comprises a deflector base (32) and a deflector slide (33), wherein the first opening (18a) is arranged at the deflector base (32) and the second opening (18b) is arranged at a deflector slide (33), wherein the deflector slide (33) can be displaced relative to the deflector base (32).