EP0305971B1 - Method and device for false-twist spinning - Google Patents

Abstract

A false-twist spinning unit or apparatus comprises a first spinning disc, such as a top spinning disc and a second spinning disc, such as a bottom spinning disc rotating in opposite directions and arranged in staggered or offset relation at an inter-axis distance from one another such that friction rings thereof form a substantially rhomboid-like crossing surface. Disposed outside the friction rings are suction surfaces which engage the fibers of a sliver delivered from a nip line of an exit roll pair of a sliver feeder and convey such fibers to a yarn core line. The suction surfaces have suction apertures and sucked-off air is transported by suction nozzles coacting with the suction apertures. In operation, at the region of the nip line there is produced a false-twisted yarn core forming a spinning triangle. Edge fibers of the sliver remain outside the spinning triangle and are conveyed by the suction surfaces towards the yarn core line, yet not with the intent of forming a yarn core but for the purpose of being wound around the already formed yarn core. The finished or spun yarn is withdrawn from the false-twist spinning unit by a draw-off roll pair.

Description

The invention relates to a method and a device for false twist spinning according to the preamble of patent claims 1 and 11, respectively.

Various false twist spinning processes for producing a yarn are known in which the yarn core is untwisted and the wrapping fibers are wound around them to hold these untwisted fibers together. The untwisted core fibers as well as the wrapping fibers are staple fibers, which are usually supplied by a drafting system.

A method known per se (DE-AS 26 20 118 and US Pat. No. 4,183,202) consists of a false twist nozzle and a wrapping nozzle, in that a sliver emitted by a drafting device is divided into core fibers and edge fibers and the core fibers are seen through them in the yarn running direction , second twist nozzle are so-called wrongly twisted, while the edge fibers lying against the wrongly twisted yarn core are wound in the opposite direction of rotation around the wrongly twisted yarn core by the first nozzle, again in the direction of the thread. Here, these edge fibers are wound around the wrongly twisted yarn core as wrapping fibers, so that so-called corkscrew effects can occur on the yarn, which can give the yarn a certain stiffness and the fabric made from it a certain boardiness.

Another known prior art is published in European patent application 0 131 170. In this process, only one twist nozzle is used, namely the one for incorrectly turning the yarn core. The peculiarity of this method is that the distance between the point at which the edge fibers are brought into contact with the wrongly twisted yarn core and the clamping line of the output roller pair is chosen such that the edge fibers are wound around the yarn core as long as their rear End is still held in the clamping line. On the one hand, the fiber end of the individual edge fibers is wound into the so-called spinning triangle, and on the other hand, the edge fibers are rotated around the yarn core in the same direction of rotation as the direction of rotation of the yarn core, but with a much steeper slope, so that when the yarn core is untwisted, in which the core fibers are parallel, the edge fibers are rotated into an opposite rotation via a neutral position in which they are parallel to the yarn conveying direction. In other words, the edge fibers have an S twist before the twist core is untwisted, but then a Z twist in the finished yarn.

As a result, the edge fibers are wound around the yarn core sufficiently, but not so strongly that strong corkscrew effects can occur.

The disadvantage of all systems in which pneumatic swirl nozzles are used lies in the rotational speed of the air vortex, which is limited by the speed of sound of the air, and thus also the yarn core in the swirl nozzle.

In a further known method (DE 36 39 031 A1), therefore, an edge fiber wrapping nozzle with a strappy swirl device was used combined, in that the strappy swirl device consists of two crossed, driven friction straps.

This eliminates the limitation of twist distribution on the wrongly twisted yarn core, but there remains the problem of strong corkscrew effects and the disadvantage of difficult fiber guidance from the clamping line of the drafting system to the detection of the fibers by the strappy twist generator.

The invention has for its object to provide a false twist method with which the yarn core can be wound with edge fibers in a precisely predetermined, optimal strength and a high production speed is made possible.

This object is achieved by the characterizing features of claims 1 and 11.

Advantageous embodiments of the invention are listed in the further claims.

The advantages achieved by the invention lie in the possibility of increasing the spinning speed with good yarn properties compared to the pneumatic false twist elements.

The invention is explained in more detail below, for example, with reference to the drawing.

• Fig. 1 einen Querschnitt durch eine erfindungsgemäße Vorrichtung entsprechend den Schnittlinien I von Fig. 2, halbschematisch dargestellt,
• Fig. 2 eine Draufsicht der Vorrichtung von Fig. 1, halbschematisch dargestellt,
• Fig. 3 eine schematische Darstelung von Details aus Fig. 2,
• Fig. 4 bis 6 je einen Verfahrensschritt, halbschematisch dargestellt,
• Fig. 7 das fertige Garn, halbschematisch dargestellt,
• Fig. 8 eine Variante des mit den Fig. 4 bis 6 gezeigten Verfahrens,
• Fig. 9 eine Seitenansicht einer Variante der erfindungsgemäßen Vorrichtung in Blickrichtung II von Fig. 10, halbschematisch dargestellt,
• Fig. 10 eine Draufsicht der Vorrichtung von Fig. 9, halbschematisch dargestellt,
• Fig. 10a ein vergrößertes Detail der Vorrichtung von Fig. 10,
• Fig. 11 ein Detail der Vorrichtung von Fig. 9 und 10, in der Ansicht von Fig. 9 dargestellt,
• Fig. 12 ein vergrößertes Detail der Vorrichtung von Fig. 1,
• Fig. 13 eine Variante der Vorrichtung von Fig. 2,
• Fig. 14 ein Detail der Variante von Fig. 13, in Blickrichtung III von Fig. 13,
• Fig. 15 und 16 je eine Variante des Details von Fig. 12,
• Fig. 17a bis 18c je zwei Details der Vorrichtungen der Fig. 1 und 2 bzw. 9 und 10, schematisch dargestellt.

It shows:

• 1 shows a cross section through a device according to the invention corresponding to the section lines I of Fig. 2, shown semi-schematically,
• 2 is a top view of the device of FIG. 1, shown semi-schematically,
• 3 shows a schematic representation of details from FIG. 2,
• 4 to 6 each a process step, shown semi-schematically,
• 7 shows the finished yarn, shown semi-schematically,
• 8 shows a variant of the method shown in FIGS. 4 to 6,
• 9 is a side view of a variant of the device according to the invention in viewing direction II of FIG. 10, shown semi-schematically,
• 10 is a top view of the device of FIG. 9, shown semi-schematically,
• 10a is an enlarged detail of the device of FIG. 10,
• 11 is a detail of the device of FIGS. 9 and 10, shown in the view of FIG. 9,
• 12 is an enlarged detail of the device of FIG. 1,
• 13 shows a variant of the device from FIG. 2,
• 14 shows a detail of the variant from FIG. 13, in viewing direction III from FIG. 13,
• 15 and 16 each a variant of the detail of Fig. 12,
• 17a to 18c, two details of the devices of FIGS. 1 and 2 or 9 and 10, shown schematically.

In a drafting unit 1 functioning as a sliver feed element, a sliver 2 is brought to a predetermined width F in a sliver straightener 32 and then drawn in a main drafting zone 3 between a pair of apron rollers 4 and a pair of exit rollers 5 and produced in a false twist spinning unit 6 to form a yarn 7.

The drafting system shown is only that part of a drafting system which contains the main drafting zone 3 and which can additionally also contain a sliver funnel (not shown) and a drafting indexing field (not shown).

The false twist spinning unit 6 comprises an upper spinning disc 8, viewed in the direction of FIG. 1, and a lower spinning disc 9.

The spinning disc 8 comprises a friction ring 10 and a suction ring with a suction surface 11, while the spinning disc 9 comprises a friction ring 12 and a suction ring with a suction surface 13. The friction ring 10 and the friction ring 12 each have a friction surface 21.

The suction surfaces 11 and 13 are also provided in a ring shape. The holes 22 and 23 forming the suction surface are shown in the disks 8 and 9 (FIGS. 2, 3 and 13) only each in a section.

For the suction of the air through the holes 22 and 23 of the suction surfaces 11 and 13, the upper spinning disc 8 is assigned a suction nozzle 14 and the lower spinning disc 9 of a suction nozzle 15.

The suction nozzles 14 and 15 extend close to the air inlet opening (e.g. 0.1-0.3 mm), but without contact, to the surface opposite the suction surface 11 and 13 in order to keep the false air inlet as small as possible.

The spinning disc 8 or 9 also has a cover wall 16 or 17, behind which the suction nozzle 14 or 15 is arranged.

A drive shaft 18 is provided for driving the spinning disc 8 and a drive shaft 19 is provided for driving the spinning disc 9.

2, the suction nozzles 14 and 15 each have a predetermined width A. As can be seen from FIGS. 17a to 17c, the suction nozzles 14 and 15 can be arranged such that the suction nozzles, as viewed in the direction of FIG. 2, either adjoin one another according to FIG. 17a or have a distance B.1 according to FIG. 17b or overlap by an amount B.2 as shown in Fig. 17c. The meaning of these variants will be explained later in connection with the description of the operating conditions.

As can also be seen from FIG. 2, the two spinning disks 8 and 9 are not arranged coaxially, but are offset by a center distance C and, as can be seen from FIG. 1, are provided with a certain opening, in such a way that, as shown in FIG. 1 and 2 combined can be seen, only one closer to the clamping line K of the output roller pair 5, Rhombus-like crossing surface 21.1 is created as the contact surface of the friction surfaces 21 of the two friction rings 10 and 12.

Furthermore, the bearings and drives of the drive shafts 18 and 19 are not shown for the sake of simplicity, but it goes without saying that bearing and drive elements must be provided in order to drive the spinning disks 8 and 9 in the directions of rotation X and Z.

Likewise, those elements are not shown, to which the suction nozzle 14 or 15 is attached. For example, the suction nozzles 14 and 15 could each be attached to the element which serves to accommodate the bearings and the drive for the shafts 18 and 19, respectively.

Furthermore, it is also not shown that the elements receiving the drive shafts 18 and 19 can be provided in such a way that at least one of the spinning disks can be lifted off the other in order to carry out necessary cleaning work on the mutually opposite surfaces of the spinning disks.

In operation, the drafting device 1 is adjusted with the aid of the hopper 32 (also called a condenser) in such a way that the sliver 2 with a substantially predetermined width F is released from the clamping line K formed by the pair of output rollers 5, so that the sliver 2, as with 2 to 6, are divided in the spinning process into edge fibers M or N and into the width R resulting from the spinning triangle S. The subdivision arises as follows:

When piecing, the suction of the suction surfaces 11 and 13 releases the fibers of the sliver 2 released from the clamping line K between the spinning disks 8 and 9 and conveys them against the yarn core line L, in which the Fibers meet from both directions of conveyance and part of them, looping around, forms a primarily twisted yarn core. To ensure that the fibers meet, the suction nozzles 14 and 15 are brought together, as described earlier. It should be mentioned that the piecing or spinning conditions in production do not differ significantly, whether the suction nozzles 14 and 15 according to FIG. 17a, as viewed in FIG. 2, adjoin one another or according to FIG. 17b a distance B.1 ( in the experiment: 4 mm) or, according to FIG. 17c, an overlap of B.2 (in the experiment: 4 mm).

This primarily twisted core of twine experiences through the opposite, i.e. in the directions X and Z rotating suction surfaces 11 and 13 a common force component Y in the yarn conveying direction P (Fig. 3), so that this primarily rotated yarn core is automatically conveyed against the intersection surface 21.1 and detected by it. This common force component Y is shown schematically in FIG. 3 and without any statement about an effective force magnitude starting from an intersection point D, in which the center lines V and W of the suction surfaces 11 and 13 intersect.

The detection of this yarn core by the intersection surface 21.1 results on the one hand in a firmer twist in the yarn core and on the other hand in turn promotes the rotated yarn core in the yarn conveying direction P.

The conveying action of the crossing surface 21.1 in the direction P must be selected such that a sufficiently large tension is created in the wrongly twisted yarn core, because this tension also determines the width R of the spinning triangle, with the conveying action being understood to mean a combination of the conveying force and the conveying speed. This conveying effect in the direction P depends on the friction as well Yarn core and crossing surface 21.1 also depend on the size of the angular velocity of the friction rings 10 and 12 and the center distance C of the spinning disks 8 and 9. In Fig. 3, the angular velocity is shown schematically and without any indication of effective quantities with the vectors G and H starting from the intersection of the center lines U and T, the common vector Q pointing in the yarn conveying direction P depending on the center distance C and the angular velocity.

The width R of the spinning triangle S and the total width F of the sliver 2 give rise to the width M or N of the edge fibers, which are also taken over by the suction surfaces 11 and 13, respectively. However, since these edge fibers are further away from the line L than the fibers forming the yarn core, they are no longer twisted as a yarn core, but are gripped by the rotating yarn core and wound around it.

Basically, this is to be understood in such a way that the fibers closer to the center are already twisted into a yarn core before the edge fibers M and N reach the line L, so that they remain as wrapping fibers when the yarn core is screwed in.

The wrapping process is shown in Figs. 4, 5 and 6 and the finished yarn in Fig. 7.

As already mentioned, a so-called incorrectly rotated yarn core 24 is formed between the friction rings 10 and 12 in the area of the crossing surface 21.1, which extends between the crossing surface 21.1 and the spinning triangle S.

The edge fibers are wound around the yarn core 24 as follows:

After the leading end of the edge fibers M and N (only one fiber from the area M is shown in FIGS. 4, 5 and 6 for the sake of simplicity) has been gripped by the rotating yarn core 24, it is provided that the trailing end of the gripped fiber is still guided in the clamping line K, a winding around the yarn core 24 in the same direction of rotation, ie with S-twist of the yarn core 24 also S-twist of the wrapping fiber, but with a much larger pitch γ. However, the slope γ becomes somewhat smaller towards the spinning triangle and can correspond to the slope β shortly before the spinning triangle.

This smaller slope γ towards the spinning triangle arises from the migration of the winding at a higher speed than the advancement of the yarn core in a direction opposite to the yarn advancement P, i.e. towards the spinning triangle, and ensures, provided that the rear fiber end is still covered by the clamping line K, that this fiber end is screwed into the spinning triangle, so that the rear fiber end subsequently released by the clamping line K in the yarn core retains the finished yarn . The slope γ thus also decreases with increasing speed of the hiking mentioned.

In order to ensure the winding of the rear fiber end into the spinning triangle, the distance E (FIG. 3) between the crossing area of the suction surfaces 11 and 13, which is shown concentrated with the crossing point D of the center lines V and W of the suction surfaces 11 and 13, and the clamping line K may be smaller than the length of the edge fibers M and N. If the front end of the fiber is twisted too early, the length of the edge fiber can be shortened in such a way that the wrapping strength given by the adhesive length of the thread is not sufficient to give the finished yarn sufficient tensile strength .

The twisting of the yarn core 25 takes place between the friction surface section 21.1 and the clamping line of the take-off roller pair 20 provided after the false twist unit. The finished yarn 7 shown in FIG. 7, which is passed on from the take-off roller pair 20, then consists of an essentially untwisted yarn core 25, which consists of around these wound edge fibers M and N, now called winding fibers M1 and N1, is held together.

The gradient ΔA (FIG. 7) of these wrapping fibers M1 and N1 essentially corresponds to the gradient difference Δ (FIG. 5), which results from the difference between the gradient β of the wrongly twisted core 24 and the gradient γ of the edge fibers M and N. However, the winding direction of the wrapping fibers M1 and N1 is opposite to that of the edge fibers M and N, i.e., if the edge fibers M and N have an S direction, the wrapping fibers have a Z direction. During the unraveling, the wound fibers have a position over a part of their length and for a short moment, which is parallel to the longitudinal axis of the yarn core, until they increasingly take on the opposite direction of twist as the yarn core is further untwisted.

It is possible that certain fibers of a fiber structure forming a spinning triangle are nevertheless not contained in the spinning triangle when leaving the clamping line K, namely if, for example, the adhesive force between these fibers and the rollers is greater than that of the other fibers forming the spinning triangle. Such fibers, like the so-called edge fibers M and N, remain free with their front ends until, like the edge fibers M and N, they are caught by the rotating yarn core 24 and also form wrapping fibers.

Furthermore, it has been shown that the spinning triangle is divided again and again into small spinning triangles with different widths r (FIG. 8), so that the edge fibers M and N are not only in the edge parts, as is the case with FIG. 4 and 5 is shown, with the width F must occur, but edge fibers M and N of the entire width F can be distributed outside and between the individual small spinning triangles. For the rest, reference is made in this regard to the European patent application 0 131 170 mentioned at the outset, in which further details, but with other reference numerals, are listed with reference to FIG. 6a which may form part of this application.

9 and 10 show a further device for carrying out the method according to the invention. Instead of the spinning disks 8 and 9 shown in FIGS. 1 and 2, two crossed spinning straps 50 and 51 are shown therein.

These spinning straps 50 and 51 each comprise a metal carrier belt 52 and 53, which is received on rotatably mounted deflection rollers 54 and 55 or 56 and 57, not shown, with at least one deflection roller per spinning straps having to be drivable. The driving and rotatable bearings are indicated with the shaft ends a.

For the sake of simplicity, the device precautions for storing and driving the stub shaft a are not shown, nor is a device for lifting at least one of the straps from the other.

The metal carrier tape 52 or 53 is perforated over the width b as a suction tape to form a suction surface 58 or 59 executed. The holes required for this are partially marked with 60 and 61.

In addition to the suction surface 58 or 59 and parallel to it, a friction belt 62 or 63, each having a friction surface 64, is drawn onto the metal carrier belt 52 or 53, in such a way that there is no slippage between the carrier belt and the friction belt. The friction belt 62 or 63 has a width c, so that the width b of the suction surface and the width c of the friction belt together give the width of the metal carrier belt 52 or 53.

The friction belts 62 and 63 lie with the friction surfaces 64 practically without play on one another and, depending on the crossing angle δ (FIG. 10a) of the spinning straps 50 and 51, form a rectangular or rhombic crossing surface 64.1.

The summed thickness of the friction belt 62 and 63 creates a corresponding distance between the suction surfaces 58 and 59.

In order to be able to suck air through these suction surfaces 58 and 59, a suction nozzle 65 is provided within the spinning strap 50 and a suction nozzle 66 is provided within the spinning strap 51, the suction nozzle 65 having a suction mouth 67 and the suction nozzle 66 each having a mouth length d ( 18a to c).

This suction mouth 67 or 68 has a width (not marked) which corresponds to the width of the perforated suction surface.

The suction orifices 67 and 68 are brought together as described for the suction nozzles 14 and 15. It should be mentioned in the same sense as for the suction nozzles 14 and 15 that the 18a either adjoin one another according to FIG. 18a, viewed with a view of FIG. 10, or can be arranged according to FIG. 18b with a distance e.1 or according to FIG. 18c with an overlap e.2.

In an analogous manner as shown in FIG. 2 and, respectively, the distance between the clamping line K and the crossing area of the suction surfaces 58 and 59, which is shown concentrated with the intersection D.1 of the center lines f of the suction surfaces 58 and 59, is designated by E. (Figures 10 and 10a).

Furthermore, two fiber guide plates 69 and 70 (FIG. 11) are provided between the crossed spinning straps 50 and 51, which guide all the fibers between the clamping line K and the suction surfaces 58 and 59, respectively.

From Fig. 10 it can be seen that the fiber guide plates adjoin the suction surfaces 58 and 59 in order to guide the fibers emitted by the clamping gap K as close as possible against the suction surfaces 58 and 59.

The fiber guide plates 69 and 70 are provided for operation by means of supports 71 and 72, respectively. The plates can also be swiveled away to carry out cleaning work.

Otherwise, the same parts as in FIGS. 1 to 3 are provided with the same reference numerals. The forces arising in the intersection area 64.1, which on the one hand impart the wrong twist to the yarn core and on the other hand the feed in the direction P, are identified in FIGS. 10 and 10a by H.1, G.1 and Q.1. On the other hand, the conveying directions of the spinning belts 50 and 51 are marked with Z.1 and X.1.

In operation, the fibers emitted by the clamping line K over the fiber bandwidth F are sucked in by the suction surfaces 58 and 59 under guidance between the fiber guide plates 69 and 70, wherein, as already described for FIGS. 1 to 3, the fibers R form a yarn core forms, which is rotated by means of the crossing surface 64.1 to an incorrectly rotated yarn core. The edge fibers from the edge fiber area M or N are wound around the wrongly twisted yarn core in the manner shown in FIGS. 4 to 6.

The twisting of the yarn core takes place, as for the device of FIGS. 1 to 3, between the friction surface section 21.1 or 24.1 and the clamping line of the pair of take-off rolls 20.

The distance E can be adjusted with or without changing the crossing angle δ, the spinning belt 50 and 51 under the resulting change in the speed vector Q.

Otherwise, the fibers behave as described with FIGS. 4 to 8, so that a corresponding description relating to FIGS. 9 to 11 is omitted for the sake of simplicity.

The enlarged section of a spinning disc 8 or 9 shown with FIG. 12 shows a special type of friction ring 10.1 or 12.1 which, as can be seen from this figure, is fastened with a certain pretension. This pretension arises from the fact that the friction ring 10.1 or 12.1, with a nose 26 provided on the outer diameter, engages in a groove 27 which is provided in a spinning disc body 28. Furthermore, the friction ring 10.1 or 12.1 is fastened in the spinning disc body 28 by means of a pressure disc 29 and a plurality of screws 30 distributed around the circumference of the pressure disc 29.

The prestressing of the friction ring 10.1 creates a concave curvature 73 shown in FIG. 12 on the inner surface 35 opposite the friction surface 21.

On the other hand, the friction surface 21 was ground after the prestressing to obtain a flat friction surface 21. The advantage of the concave curvature is that any thick spots in the yarn core are resiliently let through by the friction ring.

In FIGS. 13 and 14, in comparison to FIG. 2, a pneumatic conveying tube 31 is provided between the spinning disks 8 and 9 and the pair of draw-off rollers 20, which ensures that the yarn produced is guided in direction P against the draw-off rollers 20 during piecing. 1, one of the two take-off rollers is lifted from the other in the direction of arrow k in order to allow the yarn and the air carrying the yarn to pass between the take-off rollers.

13 and 14, the delivery pipe 31 is drawn as an injector pipe in that two air supply pipes 32 supply the air to the delivery pipe 31.

A conveyor tube 31 shown in FIGS. 13 and 14 can also be used between the crossed spinning straps 50 and 51 and the pair of draw rollers 20.

15, the spinning disc 8 is assigned a fiber guide plate 34 and the spinning disc 9 a fiber guide plate 35.

These fiber guide plates have the same function as the previously described fiber guide plates 69 and 70.

The fiber guide plate 34 has a mouth edge 36 and the fiber guide plate 35 has a mouth edge 37. These mouth edges 36 and 37 are provided parallel to the clamping line K. In addition, the guide plate 34 is provided with a support plate 38 and the fiber guide plate 35 with a support plate 39, by means of which the fiber guide plates mentioned are arranged in a fixed manner for operation. These gussets can be removed for cleaning.

The support plates 38 and 39 are assigned to the cover walls 16 and 17 at a distance of only a few tenths of a millimeter and have at least the same width as the width A of the suction nozzles 14 and 15.

Furthermore, the mouth edges 36 and 37 extend only so far into the diverging gap of the rollers 5 of the pair of output rollers that an air flow 40 between the mouth edges 36 and 37 and the rollers 5 has the possibility of entering between the fiber guide plates 34 and 35.

16 shows a variant of the spinning disks 8 and 9 in that the spinning disk 8.1 has no cover wall 16 and the spinning disk 9.1 has no cover wall 17. Instead of the omitted, rotating cover walls 16 and 17, the upper spinning disc 8.1, as seen in FIG. 16, has an upper suction nozzle 41 and the lower spinning disc 9.1 has a lower suction nozzle 42.

The suction nozzles 41 and 42 are provided for stationary operation, but have the possibility of being able to be removed for cleaning purposes.

The outermost region of the annular parts of the spinning disks 8.1 and 9.1, which form the suction surfaces 11.1 and 13.1 and are provided with the holes 22 and 23, protrude into a groove provided in the suction nozzles 41 and 42, as shown in FIG. 16 43 and 44 respectively.

Furthermore, the suction nozzles 41 and 42 have an associated fiber guide plate 45 and 46, the mouth edges 47 and 48 of which protrude only so far into the diverging gap of the rollers 5 of the pair of output rollers that the air flow 40 between the mouth edges 47 and 48 and the Rollers 5 can enter between the fiber guide plates 45 and 46.

Ultimately, the cavity below the curvature 73 (FIGS. 12 and 16) or above the curvature 73.1 (FIG. 16) is vented through a ventilation hole 74 or 74.1.

Claims (24)

1. A method of false twist spinning wherein
- a fiber sliver (2) is discharged with a predetermined width (F) from a fiber sliver feeding element (1) forming a clamping line (K),
- the fibers of the fiber sliver (2) are sucked in at their front end, as seen in the direction of running (P) of the fibres, by suction means (11, 13; 11.1, 13.1; 58, 59) and an inner part thereof is supplied to a twisting means (10, 12; 10.1, 12.1; 62, 63) adjoining the suction means, and wherein a false twisted yarn core (24) is formed from this part of the fibre sliver (2),
- furthermore at least outer parts of the fibre sliver (2) are supplied by the same suction means (11, 13; 11.1, 13.1; 58, 59) to the false twisted yarn core (24) as so called edge fibres in such a way that these edge fibres twist around the yarn core (24) with a pitch (γ) which is steeper than the pitch (β) of the false twisted yarn core (24),
characterized in that
- all fibres are sucked-in through two contra-movable suction surfaces (11, 13; 11.1, 13.1; 58, 59) of the suction means, are transported on the latter and are conveyed towards one another in such a way that they mix and are conveyed in the yarn conveying direction (P),
- in that the fibres conveyed by the suction surfaces (11, 13; 11.1, 13.1; 58, 59) in the yarn conveying direction (P) are conveyed between two contra-movable friction surfaces (21, 64) of the twisting means (10, 12; 10.1, 12.1; 62, 63) which, as seen in the direction of movement of the yarn (P), are provided adjoining the suction surfaces (11, 13; 11.1, 13.1; 58, 59) and are taken-up by the twisting means (10, 12; 10.1, 12.1; 62, 63) in such a way that they are on the one hand twisted to the false twisted yarn core (24) and are on the other hand conveyed further in the yarn conveying direction (P); and
- in that the distance (E) between the clamping line (K) and a conceptual predetermined crossing point (D; D.1) of the friction surfaces is provided in relation to the mean fibre length of the fibre sliver (2) in such a way that the front end of the edge fibres is engaged by the rotating yarn core (24) while their rear end is still held firmly in the said clamping line (K); and indeed in such a way that these edge fibres only leave the clamping line (K) after they have been twisted around the yarn core (24) and have been engaged by a spinning triangle (S).

2. Method in accordance with claim 1,
characterized in that the width (F) of the fibre sliver (2) is predetermined by a fibre sliver cone (32).

3. Method in accordance with claim 1 or claim 2,
characterized in that the movable suction surfaces (11, 13; 11.1, 13.1; 58, 59) move relative to one another and intersect one another at a point, as seen in a view onto the suction surfaces, in such a way that their directions of movement (X, Z; X.1, Z.1) at the point intersection (D; D.1) generate a common direction of movement or direction of force (Y, Y.1) in the yarn running direction (P) which is sufficiently large to convey the fibres transported on the suction surfaces to the twisting means (10, 12; 10.1, 12.1; 62, 63).

4. Method in accordance with one of the preceding claims,
characterized in that the two contra-moving friction surfaces (21; 64) which move relative to one another at an intersection surface (21.1; 64.1) generate, at this intersection surface (21.1; 64.1), a common direction of movement or force (Q) in the yarn running direction (P) which is sufficiently large to generate a tension in the false twisted yarn core (24) which gives the spinning triangle (S) generated by the false twisted yarn core (24) a predetermined width (R).

5. Method in accordance with claim 3,
characterized in that the directions of movement (X, Z) of the ring-like suction surfaces (11, 13; 11.1, 13.1), as vectors at the point of intersection (D) of the suction surface center lines (V, W), tangentially contact the latter.

6. Method in accordance with claim 4,
characterized in that the directions of movement of the ring-like friction surfaces (21) which rotate about their centers, as vectors (G, H) at the point of intersection of the friction surface center lines (T, U), tangentially contact the latter.

7. Method in accordance with claim 3,
characterized in that the directions of movement (X.1, Z.1) of the suction surfaces (58, 59) which are formed as straight movable endless band surfaces extend as vectors at the center lines (f) of each band away from the point of intersection (D.1) of these center lines.

8. Method in accordance with claim 4,
characterized in that the directions of movement of the straight movable friction surfaces (64) formed as endless band surfaces extend as vectors (H.1, G.1) at the center lines (h) of each band away from the point of intersection of these center lines.

9. Method in accordance with claim 1, characterized in that the width of the drafted fibre sliver is 10 to 30% larger than the width of the spinning triangle (S).

10. Method in accordance with claim 1, characterized in that the yarn (7) discharged by the twisting means (10, 12; 10.1, 12.1; 62, 63) in the yarn conveying direction (P) is picked-up by a yarn conveying means (31) and transferred to a take-off roller pair (20).

11. Apparatus for carrying out the method of claim 1 comprising

- a fibre sliver feeding element (1) forming a clamping line (K) by means of which the fibre band (2) is discharged from the clamping line (K) with a predetermined width (F), and also

- a spinning means (8, 9; 8.1, 9.1; 50, 51) which includes

- a suction means (11, 13; 11.1, 13.1; 58, 59; 14, 15; 65, 66) for the sucking in and transporting of the front fibre ends, which are discharged by the fibre sliver feeding element (1), as seen in the direction of running of the fibres, and

- a twisting means (10, 12; 10.1, 12.1; 62, 63) for the twisting of a part of the fibres delivered from the suction means to a false twisted yarn core (24),

- and also comprising means (20) for drawing-off the finished yarn (7),
characterized

- in that the suction means includes two apertured suction surfaces (11, 13; 11.1, 13.1, 58, 59), with the suction surfaces being arranged opposite to one another, running towards one another and intersecting one another, and

- in that the twisting means (10, 12; 10.1, 12.1; 62, 63) includes two friction surfaces (21, 64), and

- in that in each case one suction surface and one friction surface are arranged lying alongside one another and running in the same direction as one another, with the suction surface being arranged, as seen in the yarn conveying direction (P), in front of the friction surface.

12. Apparatus in accordance with claim 11,
characterized in that the suction surfaces (11, 13; 11.1, 13.1; 58, 59) and the friction surfaces (21, 64) are jointly drivable.

13. Apparatus in accordance with claim 12,
characterized in that in each case one suction surface (11, 13; 11.1, 13.1; 58, 59) and one friction surface (21, 64) are connected together.

14. Apparatus in accordance with claim 13,
characterized in that one suction surface (11, 11.1; 13, 13.1) and one friction surface (21) are arranged on a rotatable disc (8, 9; 8.1, 9.1) about an axis of rotation (18; 19); and in that the suction surface (11, 11.1; 13, 13.1) and also the friction surface (21) are ring-like, with the friction surface being arranged inside the suction surface, and with the friction surface being displaced transverse to the yarn axis (L) relative to the suction surface and projecting beyond the suction surface towards the yarn axis (L).

15. Apparatus in accordance with claim 14,
characterized in that the suction surface (11, 11.1; 13, 13.1) and the friction surface (21) are coaxially arranged.

16. Apparatus in accordance with claim 13,
characterized in that the spinning means consists of two discs (8, 9; 8.1, 9.1) which are arranged opposite to one another and are so displaced relative to one another with an axial spacing (C) from one axis of rotation (18) to the other (19) in a direction transverse to the yarn feed direction (P) that the suction surfaces and the ring surfaces of each disc intersect; and in that the point of intersection (D) of the suction surface center lines (V, W) which arises through this intersection has a predetermined spacing (E) from the clamping line (K); in that the speed vectors of the suction surfaces (11, 13; 11.1, 13.1) which point in the tangential direction away from the point of intersection (D) have a common component (Y) in the yarn conveying direction (P); and also in that the intersecting friction surfaces (21) have a common force component (Q) in the yarn conveying direction (P) but in that the discs (8, 9; 8.1, 9.1) are arranged so that they gape apart from one another as seen in the yarn conveying direction (P) in such a way that only the intersection surface (21.1) which lies closest to the clamping line (K) generates a common force component (Q) in the yarn conveying direction (P).

17. Apparatus in accordance with claim 13,
characterized in that one suction surface (58; 59) and one friction surface (64) are provided on an endless drivable spinning belt (50; 51), there being a suction band which extends over a predetermined part (b) of the width of the spinning belt and which has the suction surface (58; 59) and a friction band (62; 63) with the friction surface (64) which lies alongside and extends over the remaining width (c) of the spinning belt, with the friction surface being provided after the suction surface as seen in the conveying direction of the fibres, and with the friction surface being displaced relative to the suction surface.

18. Apparatus in accordance with claim 14,
characterized in that the suction surface (58, 59) and the friction surface (64) are arranged directly alongside one another.

19. Apparatus in accordance with claim 17,
characterized in that the spinning means comprises two spinning belts (50, 51) which are arranged opposite to one another in a crossed arrangement in such a way that the point of intersection (D.1) of the suction surface center lines (f) has a predetermined spacing (E) from the clamping line (K); and in that the speed vectors of the suction surfaces (58, 59) have a common component (Y.1) in the yarn conveying direction (P) and also in that the intersecting friction surfaces (64) have a common force component (Q.1) in the yarn conveying direction (P).

20. Apparatus in accordance with claim 11,
characterized in that a fibre guiding element (34, 35; 45, 46; 69, 70) is provided between the fibre band feeding element (1) and the spinning means (8, 9; 8.1, 9.1; 50, 51) in order to guide the fibres between the clamping line (K) and the spinning means.

21. Apparatus in accordance with claim 20,
characterized in that the fibre guiding element (45, 46) consists of two spaced apart symmetrical projections of the suction nozzles (41, 42) the projections being directed towards the output roller pair (5).

22. Apparatus in accordance with claim 16 or claim 18,
characterized in that a pneumatic conveying tube (31) is provided between the spinning means (8, 9; 8.1, 9.1; 50, 51) and the means (20) for drawing-off the finished yarn in order to transport the yarn (7) from the spinning means up to the yarn take-off means (20).

23. Apparatus in accordance with claim 14,
characterized in that at least one friction ring (10.1, 12.1) is resiliently yieldingly formed transverse to the yarn axis (L).

24. Apparatus in accordance with claim 23,
characterized in that the friction rings (10.1, 12.1) are inserted with pretension into the spinning discs (8, 9) or the spinning belts (50, 51).

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