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EP3724385A1 - Drawing frame for a spinning machine comprising a compaction device, and method for compacting a fibre composite - Google Patents

Drawing frame for a spinning machine comprising a compaction device, and method for compacting a fibre composite

Info

Publication number
EP3724385A1
EP3724385A1 EP18815979.2A EP18815979A EP3724385A1 EP 3724385 A1 EP3724385 A1 EP 3724385A1 EP 18815979 A EP18815979 A EP 18815979A EP 3724385 A1 EP3724385 A1 EP 3724385A1
Authority
EP
European Patent Office
Prior art keywords
fiber
nip
roller
clamping point
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18815979.2A
Other languages
German (de)
French (fr)
Other versions
EP3724385B1 (en
Inventor
Gernot Schaeffler
Peter Blankenhorn
Martin Widmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP3724385A1 publication Critical patent/EP3724385A1/en
Application granted granted Critical
Publication of EP3724385B1 publication Critical patent/EP3724385B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/02—Spinning or twisting machines in which the product is wound-up continuously ring type
    • D01H1/025—Spinning or twisting machines in which the product is wound-up continuously ring type with a condensing device between drafting system and spinning unit

Definitions

  • the present invention relates to a drafting system with a device for compacting drawn slivers in a spinning machine.
  • Draw frames for spinning machines comprise at least two pairs of rollers between which a fiber strand is drawn due to the different speeds of rotation of the roller pairs.
  • the pair of rollers after which the stretched fiber structure leaves the drafting system and is fed to a spinning device is referred to as a pair of delivery rollers.
  • the output roller pair consists of an output top roller and an output bottom roller, which form a nip through which the fiber band is conveyed.
  • Devices for compressing the drawn fiber composite are arranged after the pair of delivery rollers, mechanical as well as pneumatic compaction devices being used.
  • the compacting device disclosed therein is of pneumatic construction and consists essentially of a suction shoe and a perforated transport. In this case, a pressure element is applied to one of the rollers of the pair of output rollers, which forms a second nip with the roller next to the nip between the output top roller and the bottom roller output. Between the two terminal points and limited by the suction shoe is the compression zone. On an embodiment and arrangement of the opening in the suction shoe is not EP 1 134 309 A1.
  • a disadvantage of the proposed device is that in the compression zone the individual fibers of the fiber structure are to be integrated into the latter and for this purpose the fibers are held in their entire length without being held over the perforated transport means transversely to the conveying direction with the aid of An air flow can be moved, which can also lead to a loss of the drafting determined by the stretching of the fiber composite.
  • the promotion of fiber structure is done by the transport, the second nip serves only to prevent a yarn twist of the fiber structure can propagate into the compression zone into it.
  • the object of the present invention is to achieve a densification of the fiber composite by bundling the fibers and to provide a device which is characterized in that fibers are clumped to the fiber structure without the individual fibers transversely to the direction over a Moving means of transport.
  • a drafting system for a spinning machine for drawing a fiber structure with at least a first pair of rollers, consisting of a top roller and a bottom roller, and a second pair of rollers consisting of a Popeberwalze and a Popeunterwal- ze, wherein a first nip by the first pair of rollers and a second nip defined by the second roller pair.
  • the first clamping point and the second clamping point form a stretching field plane, which is traversed by the fiber structure in a running direction from the first clamping point to the second clamping point.
  • the drafting arrangement comprises a fiber compaction zone arranged downstream of the pair of output rollers for compacting the drawn fiber structure, which comprises a pneumatic compacting unit.
  • the tungsvorraum having a fiber bundling zone and with a looped by a sieve and sucked suction tube.
  • the fiber-bundling zone is delimited by the second nip and a third nip, the third nip being formed by the parent top roll and the screen.
  • the suction tube has a slot-shaped mammal opening with a length of 2.0 mm to 5.0 mm, which is arranged in the fiber bundling zone, the slot-shaped mammal opening in the suction tube being arranged from an end of the suction tube facing the second clamping point in the direction of the third clamping point ,
  • the ambient air sucked in through the mammalian opening causes individual fibers projecting from the fiber structure to be moved toward the mammalian opening, thus bundling the fiber structure.
  • the fiber structure moves on a sieve element transversely to its direction and thereby the fibers are pushed together, fiber bundles projecting fiber parts respectively fiber ends are brought to the fiber dressing in a fiber bundle without the fiber structure from its running direction - tion is deflected.
  • the fiber ends are guided by a pneumatic suction flow to the fiber composite and applied to the fiber structure in the third clamping point.
  • the suction tube and thus the sieve are advantageously brought as close to the second terminal point.
  • fiber parts or fiber ends which protrude from the fiber structure are detected by the air flow immediately after leaving the second clamping point and are applied to the fiber structure.
  • a distance from the second nip to the third nip along a surface of the topmost roll is less than an average staple length of the fiber strand to be drawn.
  • the serverband is transported in a defined manner from the second to the third nip.
  • the fiber bundling zone only the fiber parts projecting from the fiber structure are brought into the fiber strand. The air flow ensures that fiber parts or fiber ends projecting from the fiber structure are guided to form the fiber structure, whereby the fiber strand itself does not travel directly through the sieve element but passes through the fiber bundling zone through the clamping points.
  • the constant clamping of at least one fiber end prevents the fiber composite from losing or partially losing the stretch applied in the drafting device during passage through the fiber-bundling zone.
  • the third clamping point also drives the sieve element through the exit upper roller. Due to the friction drive of the screen element, a slight slip occurs, so that the screen element has a lower speed than the pair of output rollers. This circumstance also contributes to a bundling of the fiber structure, or an integration of projecting fiber ends into the fiber structure.
  • the mammal opening is arranged in a flat surface of the suction tube in the fiber-bundling zone.
  • the suction opening may be arranged in a curved surface of the suction tube in the fiber-bundling zone, the curvature being less than 0.04 (1 / mm).
  • the flat surface of the draft tube is inclined to a perpendicular to the direction of travel by an angle of 45 ° to 75 °, preferably 62 ° to 65 °, from the yield field plane.
  • a tangent in the third nip to the curved surface of the suction pipe to a perpendicular to the direction by an angle of 45 ° to 75 °, preferably 62 ° to 65 ° inclined to the stretching field plane.
  • the fiber structure moves between the second and third nip points through the fiber-bundling zone via the screen element guided on the suction tube.
  • the speed difference between the second and third nip results in a slight sag of the fiber structure.
  • a radial distance between the réelleun- terwalze and the voltage applied to the suction tube sieve 0.4 mm to 2.0 mm.
  • the fiber bundling zone which is formed by the surfaces of the starting lower roller and the upper roller and the sieve element or suction tube, is closed in a plane by arranging the suction tube or sieve element as close as possible to the starting lower roller.
  • the sucked by the mammalian opening ambient air is thus sucked transversely to the direction of the fiber structure.
  • the bundling effect can be enhanced.
  • the influence of the air flow caused by the rapidly rotating output lower roller will be redirected to the running direction of the fiber structure.
  • the slot-shaped mammal opening is arranged in a longitudinal extent within ⁇ 15 degrees inclined to the direction. Particularly preferred is the arrangement of the slot-shaped mammal opening in the running direction of the fiber structure.
  • the fiber bundling should not take place by a movement of the fiber structure transverse to its direction of travel. Only the yarns protruding from the fiber structure should fibers or fiber ends are nestled against the fiber structure. A movement of the entire fiber structure transverse to the direction is not necessary for this purpose.
  • the suction tube projects in a running direction of the sieve element less than 5 mm beyond the third clamping point.
  • the shortest possible guidance of the fiber structure through the sieve element after the third nip results in advantages for the geometrical arrangement of the following spinning device. This can also minimize the risk of lateral displacement of the fiber structure on the sieve element and thus damage to the previously bundled fiber structure.
  • the output top roller in the stretching field plane seen in the running direction on a curtain against the output lower roller is between 2 mm and 15 mm and / or the ratio of the diameter of the output top roll to the diameter of the starting bottom roll is 1.4 to 2.5, preferably 1.79 is at a diameter of the output top roller of 50 mm and a diameter of the output sub-roller of 28 mm.
  • the curtain of the output top roller opposite the output bottom roller allows an arrangement of the third nip near the second nip.
  • the fiber structure is guided through the sieve element to the third nip via the sieve element after the second nip and the individual fibers are detected by the third nip before leaving the second nip, wherein fiber ends projecting from the fiber structure pass over the mammal opening Fiber Association are created. It is advantageous if the majority of the fibers is not transported free of a clamping from the screening element from the second nip to the third nip. As a result of the arrangement of the mammal opening immediately after the second clamping point, the projecting fiber ends are detected by the air flow after leaving the second clamping point and the fiber structure is applied while the front end of the corresponding fiber is already held by the third clamping point.
  • an inclination of the screen element against the direction of travel, as seen against the stretching field plane causes the fiber ends, after leaving the second nip, to move through the free space in the fiber-bundling zone before they strike the screen element.
  • Figure 2 is a schematic representation of a longitudinal section of an inventive embodiment of the compression device of the drafting and
  • FIG. 3 shows a schematic illustration of a plan view in the direction X according to FIG. 2.
  • FIG. 1 shows a schematic representation of a longitudinal section of a spinning machine according to the prior art, in particular a ring spinning machine.
  • individual components of the spinning machine are shown, namely a drafting device 2 and a spinning device 14.
  • the drafting device 2 consists of three pairs of rollers, an input roller pair 5, a pair of apron rollers 64 and an output roller pair 9.
  • the pair of belt rollers 6 is formed by a pair of rollers Top roller 7 and a bottom roller 8.
  • the output roller pair 9 is formed by an output top roller 10 and an output bottom roller 11.
  • the two rollers of a pair of rollers are pressed against each other and form a nip at their point of contact, the nip K1 through the top roller 7 and the bottom roller 8 and the nip K2 is formed by the output roller pair 9 between the output top roller 10 and the output bottom roller 11.
  • the entering into the drafting 2 fiber structure 1 passes through the drafting system 2 in the direction 3 and is clamped between the rollers of the roller pairs 3,4 and 5 through the clamping points. Due to different rotational speeds of the roller pairs 3, 4 and 5, the fiber composite 1 is stretched.
  • the clamping points K1 and K2 form a draft field plane 4. During the drawing, the fiber structure 1 is simultaneously transported through the drafting system 2.
  • the spinning device 14 consists essentially of a ring rail 18, which carries the spinning ring 16, and a spindle rail 19, on which the coil 17 is fixed.
  • the fiber composite 12 passes through a rotor 15 to the coil 17.
  • the coil 17 is rotated, this has the consequence that the rotor 15 is also rotated by the fiber structure 12 on the spinning ring 16 in rotation becomes. Due to the different rotational speed of the spool 17 and the runner 15, the fiber structure 12 is given a rotation, thereby forming a yarn which is wound onto the spool 17 by moving the ring rail 18 up and down.
  • FIG. 2 shows a schematic representation of a longitudinal section of an embodiment according to the invention of a compression device of the drafting system.
  • the Riemchenwalzencru 6, consisting of an upper roller 7 and a lower roller 8 forms a first nip K1.
  • the output roller pair 9, consisting of the output lower roller 10 and the upper roller 11 forms a second terminal point K2.
  • the fiber assembly 1 to be drawn is guided in the running direction 3 through the roller pairs 6 and 9 through the drafting system.
  • Roller pairs 6 and 9 form a stretching field plane 4 through their clamping points K1 and K2.
  • the output upper roller 10, viewed in its arrangement with respect to the lower output roller 11 in the stretching field plane 4 in the running direction 3, has a curtain A of preferably 10 mm.
  • the output top roller 10 has a diameter E which is greater than the diameter F of the output bottom roller 11, wherein a ratio of the diameter E of the top roller 10 to the diameter F of the bottom roller 11 is preferably 1.79. Because of these particular geometrical relationships between the exit top roll 10 and the exit bottom roll 11, ideal conditions for the formation of a fiber bundle zone 20 are created.
  • a suction tube 21 is arranged.
  • the suction tube 21 is looped by a sieve element 22, which is designed as an endless belt and is guided over a deflection 25.
  • the sieve element 22 forms, with the exit upper roller 10, a third clamping point K3 for the drawn fiber structure.
  • the shape of the suction tube 21 is exemplified as a triangle.
  • the fiber bundling zone 20 designates the space which is enclosed by the top roller 10, the bottom roller 11 and the suction tube 21.
  • a clamping length B is formed from the second nip K2 to the third nip K3 along a surface of the topmost roller 10, which is less than an average staple length of the fiber structure to be stretched 1.
  • the suction tube 21 has a mammal opening 24 in this fiber bundle zone 20 on.
  • the mammal opening 24 is formed as a slot-shaped opening in the wall of the suction tube 21.
  • the suction tube 21 is connected to a vacuum source (not shown) which causes air to be sucked out of the fiber-bundling zone 20 via the mammal opening 24 and thus also through the sieve element 22 sliding over the mammal opening 24.
  • a vacuum source not shown
  • the stretched fiber structure is drawn onto the sieve element 22, whereby individual fibers or fiber parts projecting from the stretched fiber structure are conveyed to the mammal opening 24 and thus cling to the stretched fiber structure.
  • the individual fibers of the fiber structure due to the short clamping length B are held in majority by either the second nip K2 or the third nip K3, so that only the free-standing ends of the fibers are integrated into the fiber structure.
  • the suction tube 21 against the fiber-bundling zone 20 shows an even surface which is inclined to a vertical of the stretching-field plane 4 at an angle ⁇ of 62 ° with respect to the stretching-field plane 4.
  • the sieve element 22 which circumscribes the suction tube 21 is arranged at a distance C of 1.0 mm from the output sub-roller 11.
  • a fiber bundling zone 20 closed by the exit upper roller 10, the output lower roller 11 and the suction tube 21 is formed so that the ambient air sucked in through the suction opening 24 is mostly from the side, ie transversely to the direction of movement of the fiber bundle into the fiber bundling zone 20 is sucked.
  • the sieve element 22 is set in motion by the output top roller 10 via the resulting frictional force in the third clamping point K3, whereby the stretched fiber structure from the fiber bundling zone 20 is fed to the third clamping point K3.
  • the compacted fiber structure 23 subsequently leaves the sieve element 22, in which case the smallest possible projection of the suction tube 21 is aimed beyond the third clamping point K3.
  • the compacted fiber structure 23 is transferred to the spinning device 14 in the direction of the yarn guide 13 of the spinning machine upstream of the spinning device 14 (see FIG. 1).
  • the geometry of the suction tube 21 makes it possible to maintain the necessary inlet geometry for a perfect functioning of the spinning device 14 despite the additional arrangement of the compacting device.
  • FIG. 3 shows a schematic representation of a plan view in the direction X according to FIG. 2.
  • the output top roller 10 is indicated, so that the screen element 22 revolving around the suction tube 21 can be seen.
  • a schlitzför shaped mammal opening 24 is provided with a length L.
  • the over the Siebele- 22 running fiber structure 23 shows protruding fiber ends in the region of the end of the mammal opening 24 which the output sub-roller 11 is facing.
  • the projecting fiber ends are applied to the fiber structure 23 by the action of the ambient air, which is directed toward the mammal opening 24 transversely to the running direction 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

The invention relates to a drawing frame (2) for a spinning machine for drawing a fibre composite (1), said drawing frame comprising: at least one first roller pair (6) consisting of a top roller (7) and a bottom roller (8); a second roller pair (9) consisting of an output top roller (11) and an output bottom roller (12), wherein a first clamping point (K1) is defined by the first roller pair (6) and a second clamping point (K2) is defined by the second roller pair (9), and the first clamping point (K1) and the second clamping point (K2) form a drawing field plane (4) through which the fibre composite (1) passes in a running direction (3) from the first clamping point (K1) to the second clamping point (K2); a fibre compaction zone, arranged downstream of the output roller pair (9), for compacting the drawn fibre composite, said zone having a pneumatic compaction device with a fibre bundling zone (20) and with a suction tube (21) around which a screen element (22) is wrapped and which can be subjected to suction, wherein the fibre bundling zone (20) is delimited by the second clamping point (K2) and a third clamping point (K3), and the third clamping point (K3) is formed by the output top roller (10) and the screen element (22). The suction tube (21) has a slot-shaped suction opening (24) having a length (L) of 2.0 mm to 5.0 mm which is located in the fibre bundling zone (20), wherein the slot-shaped suction opening (24) is located in the suction tube (21) on an end of the suction tube (21) facing the second clamping point (K2) in the direction of the third clamping point (K3).

Description

Streckwerk für eine Spinnmaschine mit einer Verdichtunqsvorrichtunq und Verfahren zur Verdichtung eines Faserverbandes  Drafting system for a spinning machine with a compacting device and method for compacting a fiber strand

Die vorliegende Erfindung betrifft ein Streckwerk mit einer Vorrichtung zur Verdichtung von verstreckten Faserbändern in einer Spinnmaschine. The present invention relates to a drafting system with a device for compacting drawn slivers in a spinning machine.

Streckwerke für Spinnmaschinen umfassen zumindest zwei Walzenpaare zwischen denen ein Faserverband aufgrund der unterschiedlichen Drehzah- len der Walzenpaare verstreckt wird. Das Walzenpaar nach welchem der verstreckte Faserverband das Streckwerk verlässt und einer Spinnvorrich- tung zugeführt wird, wird als Ausgangswalzenpaar bezeichnet. Das Aus- gangswalzenpaar besteht aus einer Ausgangsoberwalze und einer Aus- gangsunterwalze, welche eine Klemmstelle bilden durch welche der Faser- verband gefördert wird. Vorrichtungen zur Verdichtung des verstreckten Fa- serverbandes werden nach dem Ausgangswalzenpaar angeordnet, dabei kommen mechanische wie auch pneumatische Verdichtungsvorrichtungen zum Einsatz. Draw frames for spinning machines comprise at least two pairs of rollers between which a fiber strand is drawn due to the different speeds of rotation of the roller pairs. The pair of rollers after which the stretched fiber structure leaves the drafting system and is fed to a spinning device is referred to as a pair of delivery rollers. The output roller pair consists of an output top roller and an output bottom roller, which form a nip through which the fiber band is conveyed. Devices for compressing the drawn fiber composite are arranged after the pair of delivery rollers, mechanical as well as pneumatic compaction devices being used.

Gattungsgemäße Vorrichtungen sind im Stand der Technik bekannt und kommen immer dann zum Einsatz, wenn ein Faserband nach einem Verstre- ckungsvorgang in einer Spinnmaschine verdichtet werden muss. Beschrie- ben ist eine entsprechende Vorrichtung beispielsweise in der EP 1 134 309 A1. Die darin offenbarte Verdichtungsvorrichtung ist von pneumatischer Bau- art und besteht im Wesentlichen aus einem Saugschuh und einem perforier- ten Transportmittel. Dabei wird an einer der Walzen des Ausgangswalzen- paares ein Andruckelement angelegt, welches mit der Walze neben der Klemmstelle zwischen der Ausgangsoberwalze und der Ausgangsunterwalze eine zweite Klemmstelle bildet. Zwischen den beiden Klemmstellen und durch den Saugschuh begrenzt befindet sich die Verdichtungszone. Auf eine Ausführung und Anordnung der Öffnung im Saugschuh geht die EP 1 134 309 A1 nicht ein. Nachteilig an der vorgeschlagenen Vorrichtung ist, dass in der Verdichtungs- zone die einzelnen Fasern des Faserverbandes in diesen eingebunden wer- den sollen und zu diesem Zweck die Fasern in ihrer gesamten Länge ohne gehalten zu werden über das perforierte Transportmittel quer zu Förderrich- tung mit Hilfe einer Luftströmung bewegt werden, was ebenfalls zu einem Verlust der durch das Streckwerk bestimmten Streckung des Faserverban- des führen kann. Die Förderung des Faserverbandes erfolgt durch das Transportmittel, die zweite Klemmstelle dient lediglich dazu, zu verhindern, dass eine Garndrehung des Faserverbandes sich in die Verdichtungszone hinein fortpflanzen kann. Generic devices are known in the art and are always used when a sliver after a Verstre- ckungsvorgang must be compressed in a spinning machine. Described is a corresponding device, for example, in EP 1 134 309 A1. The compacting device disclosed therein is of pneumatic construction and consists essentially of a suction shoe and a perforated transport. In this case, a pressure element is applied to one of the rollers of the pair of output rollers, which forms a second nip with the roller next to the nip between the output top roller and the bottom roller output. Between the two terminal points and limited by the suction shoe is the compression zone. On an embodiment and arrangement of the opening in the suction shoe is not EP 1 134 309 A1. A disadvantage of the proposed device is that in the compression zone the individual fibers of the fiber structure are to be integrated into the latter and for this purpose the fibers are held in their entire length without being held over the perforated transport means transversely to the conveying direction with the aid of An air flow can be moved, which can also lead to a loss of the drafting determined by the stretching of the fiber composite. The promotion of fiber structure is done by the transport, the second nip serves only to prevent a yarn twist of the fiber structure can propagate into the compression zone into it.

Aufgabe der vorliegenden Erfindung ist es, eine Verdichtung des Faserver- bandes durch eine Bündelung der Fasern zu erreichen und hierzu eine Vor- richtung zu schaffen, welche sich dadurch auszeichnet, dass Fasern an den Faserverband angeschmiegt werden ohne die einzelnen Fasern quer zur Laufrichtung über ein Transportmittel zu bewegen. The object of the present invention is to achieve a densification of the fiber composite by bundling the fibers and to provide a device which is characterized in that fibers are clumped to the fiber structure without the individual fibers transversely to the direction over a Moving means of transport.

Die Aufgabe wird gelöst durch ein Streckwerk und ein Verfahren mit den Merkmalen der unabhängigen Patentansprüche. The object is achieved by a drafting system and a method with the features of the independent claims.

Vorgeschlagen wird ein Streckwerk für eine Spinnmaschine zum Verstrecken eines Faserverbandes mit zumindest einem ersten Walzenpaar, bestehend aus einer Oberwalze und einer Unterwalze, und mit einem zweiten Walzen- paar bestehend aus einer Ausgangsoberwalze und einer Ausgangsunterwal- ze, wobei eine erste Klemmstelle durch das erste Walzenpaar und eine zwei- te Klemmstelle durch das zweite Walzenpaar definiert ist. Die erste Klemm- stelle und die zweite Klemmstelle bilden eine Streckfeldebene aus, welche vom Faserverband in einer Laufrichtung von der ersten Klemmstelle zur zweiten Klemmstelle durchlaufen wird. Das Streckwerk umfasst eine dem Ausgangswalzenpaar nachgeordneten Faserverdichtungszone zur Verdich- tung des verstreckten Faserverbandes, welche eine pneumatische Verdich- tungsvorrichtung mit einer Faserbündelungszone und mit einem von einem Siebelement umschlungenen und besaugbaren Saugrohr aufweist. Die Fa- serbündelungszone ist durch die zweite Klemmstelle und eine dritte Klemm- stelle begrenzt, wobei die dritte Klemmstelle durch die Ausgangsoberwalze und das Siebelement gebildet ist. Das Saugrohr weist eine schlitzförmige Säugöffnung mit einer Länge von 2.0 mm bis 5.0 mm auf, welche in der Fa- serbündelungszone angeordnet ist, wobei die schlitzförmige Säugöffnung im Saugrohr von einem der zweiten Klemmstelle zugewandten Ende des Saug- rohres in Richtung der dritten Klemmstelle angeordnet ist. Proposed is a drafting system for a spinning machine for drawing a fiber structure with at least a first pair of rollers, consisting of a top roller and a bottom roller, and a second pair of rollers consisting of a Ausgangsoberwalze and a Ausgangsunterwal- ze, wherein a first nip by the first pair of rollers and a second nip defined by the second roller pair. The first clamping point and the second clamping point form a stretching field plane, which is traversed by the fiber structure in a running direction from the first clamping point to the second clamping point. The drafting arrangement comprises a fiber compaction zone arranged downstream of the pair of output rollers for compacting the drawn fiber structure, which comprises a pneumatic compacting unit. tungsvorrichtung having a fiber bundling zone and with a looped by a sieve and sucked suction tube. The fiber-bundling zone is delimited by the second nip and a third nip, the third nip being formed by the parent top roll and the screen. The suction tube has a slot-shaped mammal opening with a length of 2.0 mm to 5.0 mm, which is arranged in the fiber bundling zone, the slot-shaped mammal opening in the suction tube being arranged from an end of the suction tube facing the second clamping point in the direction of the third clamping point ,

Die durch die Säugöffnung angesaugte Umgebungsluft führt dazu, dass ein- zelne vom Faserverband abstehende Fasern zur Säugöffnung bewegt wer- den und damit eine Bündelung des Faserverbandes erfolgt. Im Vergleich zur herkömmlichen pneumatischen Verdichtung, bei welcher der Faserverband auf einem Siebelement quer zu seiner Laufrichtung bewegt und dadurch die Fasern zusammengeschoben werden, werden bei einer Faserbündelung nur vom Faserverband abstehende Faserteile respektive Faserenden an den Fa- serverband herangeführt ohne dass der Faserverband aus seiner Laufrich- tung ausgelenkt wird. In einem derartigen Verfahren einer Faserbündelung werden die Faserenden durch eine pneumatische Saugströmung zum Faser- verband geführt und in der dritten Klemmstelle an den Faserverband ange- legt. Das Saugrohr und damit das Siebelement werden vorteilhafterweise möglichst nahe an die zweite Klemmstelle herangeführt. Dadurch werden Faserteile respektive Faserenden, welche vom Faserverband abstehen, un- mittelbar nach Verlassen der zweiten Klemmstelle von der Luftströmung er- fasst und an den Faserverband angelegt. The ambient air sucked in through the mammalian opening causes individual fibers projecting from the fiber structure to be moved toward the mammalian opening, thus bundling the fiber structure. Compared to the conventional pneumatic compaction, in which the fiber structure moves on a sieve element transversely to its direction and thereby the fibers are pushed together, fiber bundles projecting fiber parts respectively fiber ends are brought to the fiber dressing in a fiber bundle without the fiber structure from its running direction - tion is deflected. In such a process of fiber bundling, the fiber ends are guided by a pneumatic suction flow to the fiber composite and applied to the fiber structure in the third clamping point. The suction tube and thus the sieve are advantageously brought as close to the second terminal point. As a result, fiber parts or fiber ends which protrude from the fiber structure are detected by the air flow immediately after leaving the second clamping point and are applied to the fiber structure.

Vorteilhafterweise ist ein Abstand von der zweiten Klemmstelle zur dritten Klemmstelle entlang einer Oberfläche der Ausgangsoberwalze geringer als eine mittlere Stapellänge des zu verstreckenden Faserverbandes. Dadurch werden die meisten im Faserverband enthaltenen Fasern immer entweder in der zweiten Klemmstelle oder in der dritten Klemmstelle gehalten. Der Fa- serverband wird dabei definiert von der zweiten zur dritten Klemmstelle transportiert. In der Faserbündelungszone werden damit lediglich die vom Faserverband abstehenden Faserteile in den Faserstrang gebracht. Durch den Luftstrom wird erreicht, dass vom Faserverband abstehende Faserteile respektive Faserenden zum Faserverband hingeführt werden, wobei der Fa- serverband selbst nicht direkt durch das Siebelement transportiert sondern durch die Klemmstellen gehalten die Faserbündelungszone durchläuft. Advantageously, a distance from the second nip to the third nip along a surface of the topmost roll is less than an average staple length of the fiber strand to be drawn. As a result, most of the fibers contained in the fiber structure are always held either in the second nip or in the third nip. The In this case, the serverband is transported in a defined manner from the second to the third nip. In the fiber bundling zone, only the fiber parts projecting from the fiber structure are brought into the fiber strand. The air flow ensures that fiber parts or fiber ends projecting from the fiber structure are guided to form the fiber structure, whereby the fiber strand itself does not travel directly through the sieve element but passes through the fiber bundling zone through the clamping points.

Dadurch wird die sogenannte Haarigkeit des Faserverbandes beseitigt und die Haare in den Faserverband eingebunden. Ebenfalls wird durch die stän- dige Klemmung zumindest eines Faserendes verhindert, dass der Faserver- band die im Streckwerk aufgebrachte Streckung während des Durchlaufens der Faserbündelungszone wieder verliert oder teilweise verlieren kann. This eliminates the so-called hairiness of the fiber structure and integrates the hair in the fiber structure. Also, the constant clamping of at least one fiber end prevents the fiber composite from losing or partially losing the stretch applied in the drafting device during passage through the fiber-bundling zone.

Durch die dritte Klemmstelle wird zudem das Siebelement durch die Aus- gangsoberwalze angetrieben. Durch den Reibantrieb des Siebelementes entsteht ein geringfügiger Schlupf, sodass das Siebelement eine geringere Geschwindigkeit aufweist als das Ausgangswalzenpaar. Auch dieser Um- stand trägt dazu bei, dass eine Bündelung des Faserverbandes, respektive eine Einbindung von abstehenden Faserenden in den Faserverband möglich wird. The third clamping point also drives the sieve element through the exit upper roller. Due to the friction drive of the screen element, a slight slip occurs, so that the screen element has a lower speed than the pair of output rollers. This circumstance also contributes to a bundling of the fiber structure, or an integration of projecting fiber ends into the fiber structure.

Vorteilhafterweise ist die Säugöffnung in einer ebenen Fläche des Saugroh- res in der Faserbündelungszone angeordnet. Alternativ dazu kann die Sau- göffnung in einer gekrümmten Fläche des Saugrohres in der Faserbünde- lungszone angeordnet sein, wobei die Krümmung kleiner als 0.04 (1/mm) be- trägt. Durch eine derartige Ausbildung des Saugrohres in der Faserbünde- lungszone wird eine Minimierung einer Umlenkung des Faserverbandes zwi- schen der zweiten und dritten Klemmstelle erreicht. Advantageously, the mammal opening is arranged in a flat surface of the suction tube in the fiber-bundling zone. Alternatively, the suction opening may be arranged in a curved surface of the suction tube in the fiber-bundling zone, the curvature being less than 0.04 (1 / mm). Such a design of the suction tube in the fiber bundling zone minimizes deflection of the fiber structure between the second and third clamping points.

Bevorzugterweise ist die ebene Fläche des Saugrohres zu einer Senkrechten zur Laufrichtung um einen Winkel von 45° bis 75°, bevorzugterweise 62° bis 65° gegen die Streckfeldebene geneigt. Entsprechend ist bei einer gekrümm- ten Fläche des Saugrohres eine Tangente in der dritten Klemmstelle an die gekrümmte Fläche des Saugrohres zu einer Senkrechten zur Laufrichtung um einen Winkel von 45° bis 75°, bevorzugterweise 62° bis 65° gegen die Streckfeldebene geneigt. Der Faserverband bewegt sich zwischen der zwei- ten und dritten Klemmstelle durch die Faserbündelungszone über das auf dem Saugrohr geführte Siebelement. Durch den Geschwindigkeitsunter- schied zwischen der zweiten und dritten Klemmstelle ergibt sich ein gering- fügiger Durchhang des Faserverbandes. Das heisst der Faserverband folgt nicht exakt der Oberfläche der Ausgangsoberwalze sondern bewegt sich nach Verlassen der zweiten Klemmstelle in Richtung des Saugrohres. Diese Bewegung wird bei einer entsprechenden Neigung der Fläche des Saugroh- res derart aufgefangen, dass sich die abstehenden Faserenden bedingt durch die Luftströmung an den Faserverband anlegen können. Preferably, the flat surface of the draft tube is inclined to a perpendicular to the direction of travel by an angle of 45 ° to 75 °, preferably 62 ° to 65 °, from the yield field plane. Accordingly, in the case of a curved ten surface of the suction pipe, a tangent in the third nip to the curved surface of the suction pipe to a perpendicular to the direction by an angle of 45 ° to 75 °, preferably 62 ° to 65 ° inclined to the stretching field plane. The fiber structure moves between the second and third nip points through the fiber-bundling zone via the screen element guided on the suction tube. The speed difference between the second and third nip results in a slight sag of the fiber structure. This means that the fiber structure does not follow exactly the surface of the output top roller but moves after leaving the second nip in the direction of the suction pipe. With a corresponding inclination of the surface of the suction tube, this movement is absorbed in such a way that the projecting fiber ends can rest against the fiber structure due to the air flow.

Vorteilhafterweise beträgt ein radialer Abstand zwischen der Ausgangsun- terwalze und dem am Saugrohr anliegenden Siebelement 0.4 mm bis 2.0 mm. Durch eine möglichst nahe Anordnung des Saugrohres respektive Sie- belementes an der Ausgangsunterwalze wird die Faserbündelungszone, welche durch die Oberflächen der Ausgangsunterwalze und der Ausgangs- oberwalze sowie dem Siebelement respektive Saugrohr gebildet ist, in einer Ebene geschlossen. Die durch die Säugöffnung angesaugte Umgebungsluft wird damit quer zur Laufrichtung des Faserverbandes angesaugt. Dadurch kann die Bündelungswirkung verstärkt werden. Zudem wird der Einfluss des durch die sich schnell drehenden Ausgangsunterwalze hervorgerufenen Luft- stromes auf die Laufrichtung des Faserverbandes umgelenkt werden. Advantageously, a radial distance between the Ausgangsun- terwalze and the voltage applied to the suction tube sieve 0.4 mm to 2.0 mm. The fiber bundling zone, which is formed by the surfaces of the starting lower roller and the upper roller and the sieve element or suction tube, is closed in a plane by arranging the suction tube or sieve element as close as possible to the starting lower roller. The sucked by the mammalian opening ambient air is thus sucked transversely to the direction of the fiber structure. As a result, the bundling effect can be enhanced. In addition, the influence of the air flow caused by the rapidly rotating output lower roller will be redirected to the running direction of the fiber structure.

Weiterhin ist es von Vorteil, wenn die schlitzförmige Säugöffnung in einer Längsausdehnung innerhalb von ± 15 Winkelgraden geneigt zur Laufrichtung angeordnet ist. Besonders bevorzugt ist die Anordnung der schlitzförmigen Säugöffnung in der Laufrichtung des Faserverbandes. Die Faserbündelung soll nicht durch eine Bewegung des Faserverbandes quer zu dessen Lauf- richtung erfolgen. Es sollen lediglich die vom Faserverband abstehenden Fa- sern respektive Faserenden an den Faserverband angeschmiegt werden. Eine Bewegung des gesamten Faserverbandes quer zur Laufrichtung ist hierzu nicht notwendig. Furthermore, it is advantageous if the slot-shaped mammal opening is arranged in a longitudinal extent within ± 15 degrees inclined to the direction. Particularly preferred is the arrangement of the slot-shaped mammal opening in the running direction of the fiber structure. The fiber bundling should not take place by a movement of the fiber structure transverse to its direction of travel. Only the yarns protruding from the fiber structure should fibers or fiber ends are nestled against the fiber structure. A movement of the entire fiber structure transverse to the direction is not necessary for this purpose.

Vorteilhafterweise kragt das Saugrohr in einer Laufrichtung des Siebelele- ments weniger als 5 mm über die dritte Klemmstelle aus. Eine möglichst kur- ze Führung des Faserverbandes durch das Siebelement nach der dritten Klemmstelle ergibt Vorteile für die geometrische Anordnung der nachfolgen- den Spinnvorrichtung. Auch kann dadurch die Gefahr einer seitlichen Ver- schiebung des Faserverbandes auf dem Siebelement und damit eine Schä- digung des zuvor gebündelten Faserverbandes minimiert werden. Advantageously, the suction tube projects in a running direction of the sieve element less than 5 mm beyond the third clamping point. The shortest possible guidance of the fiber structure through the sieve element after the third nip results in advantages for the geometrical arrangement of the following spinning device. This can also minimize the risk of lateral displacement of the fiber structure on the sieve element and thus damage to the previously bundled fiber structure.

Bevorzugterweise weist die Ausgangsoberwalze in der Streckfeldebene in Laufrichtung gesehen einen Vorhang gegenüber der Ausgangsunterwalze auf. Ebenso ist es von Vorteil, wenn der Vorhang, gemessen in der Streck- feldebene, zwischen 2 mm und 15 mm und/oder das Verhältnis des Durch- messers der Ausgangsoberwalze zum Durchmesser der Ausgangsunterwal- ze 1 ,4 bis 2,5, bevorzugterweise 1.79 beträgt bei einem Durchmesser der Ausgangsoberwalze von 50 mm und einem Durchmesser der Ausgangsun- terwalze von 28 mm. Der Vorhang der Ausgangsoberwalze gegenüber der Ausgangsunterwalze ermöglicht eine Anordnung der dritten Klemmstelle na- he der zweiten Klemmstelle. Durch die Vergrösserung der Ausgangsober- walze gegenüber der Ausgangsunterwalze wird eine Verbesserung der räumlichen Anordnung der Faserbündelungszone erreicht. Preferably, the output top roller in the stretching field plane seen in the running direction on a curtain against the output lower roller. It is likewise of advantage if the curtain, measured in the stretched field plane, is between 2 mm and 15 mm and / or the ratio of the diameter of the output top roll to the diameter of the starting bottom roll is 1.4 to 2.5, preferably 1.79 is at a diameter of the output top roller of 50 mm and a diameter of the output sub-roller of 28 mm. The curtain of the output top roller opposite the output bottom roller allows an arrangement of the third nip near the second nip. By increasing the output top roller relative to the output bottom roller, an improvement in the spatial arrangement of the fiber bundling zone is achieved.

Weiter wird ein Verfahren zur Verdichtung eines aus Einzelfasern bestehen- der Faserverbandes in einer Spinnereimaschine vorgeschlagen mit zumin- dest einem ersten Walzenpaar bestehend aus einer Oberwalze und einer Unterwalze, und mit einem zweiten Walzenpaar bestehend aus einer Aus- gangsoberwalze und einer Ausgangsunterwalze, wobei eine erste Klemm- stelle durch das erste Walzenpaar und eine zweite Klemmstelle durch das zweite Walzenpaar definiert werden, und durch die erste Klemmstelle und die zweite Klemmstelle eine Streckfeldebene ausgebildet wird, welche vom Fa- serverband in einer Laufrichtung von der ersten Klemmstelle zur zweiten Klemmstelle durchlaufen wird, und mit einer dem Ausgangswalzenpaar nachgeordneten Faserverdichtungszone zur Verdichtung des verstreckten Faserverbandes, welche eine pneumatische Verdichtungsvorrichtung mit ei- ner Faserbündelungszone und mit einem von einem Siebelement umschlun- genen und besaugbaren Saugrohr aufweist, wobei die Faserbündelungszone durch die zweite Klemmstellen und eine dritte Klemmstelle begrenzt wird, wobei die dritte Klemmstelle durch die Ausgangsoberwalze und das Sie- belement gebildet wird. Der Faserverband wird nach der zweiten Klemmstel- le durch das Siebelement über die Säugöffnung zur dritten Klemmstelle ge- führt und die einzelnen Fasern vor Verlassen der zweiten Klemmstelle durch die dritte Klemmstelle erfasst, wobei aus dem Faserverband abstehende Fa- serenden beim Überfahren der Säugöffnung an den Faserverband angelegt werden. Dabei ist es von Vorteil, wenn die Mehrheit der Fasern nicht frei von einer Klemmung vom Siebelement von der zweiten Klemmstelle zur dritten Klemmstelle transportiert wird. Durch die Anordnung der Säugöffnung unmit- telbar nach der zweiten Klemmstelle werden die abstehenden Faserenden nach Verlassen der zweiten Klemmstelle durch die Luftströmung erfasst und den Faserverband angelegt, währenddessen das vordere Ende der entspre- chenden Faser bereits durch die dritte Klemmstelle gehalten wird. Furthermore, a method is proposed for compacting a fiber composite consisting of individual fibers in a spinning machine with at least one first pair of rolls consisting of a top roll and a bottom roll, and a second pair of rolls consisting of an output top roll and an output bottom roll, wherein a first Clamping point by the first pair of rollers and a second nip defined by the second pair of rollers, and by the first nip and the second clamping point is formed a stretching field plane which is passed through by the fiber dressing in a running direction from the first nip to the second nip, and with a downstream of the pair of output fiber compaction zone for densification of the stretched fiber structure, which comprises a pneumatic compaction device with a Faserbündelungszone and with a having a suction element wrapped and sucked by a sieve element, wherein the fiber bundling zone is delimited by the second clamping points and a third clamping point, wherein the third clamping point is formed by the Ausgangsoberwalze and the sieve. The fiber structure is guided through the sieve element to the third nip via the sieve element after the second nip and the individual fibers are detected by the third nip before leaving the second nip, wherein fiber ends projecting from the fiber structure pass over the mammal opening Fiber Association are created. It is advantageous if the majority of the fibers is not transported free of a clamping from the screening element from the second nip to the third nip. As a result of the arrangement of the mammal opening immediately after the second clamping point, the projecting fiber ends are detected by the air flow after leaving the second clamping point and the fiber structure is applied while the front end of the corresponding fiber is already held by the third clamping point.

Bevorzugterweise wird durch eine Neigung des Siebelementes entgegen der Laufrichtung gesehen gegen die Streckfeldebene erreicht, dass sich die Fa- serenden nach dem Verlassen der zweiten Klemmstelle durch den freien Raum in der Faserbündelungszone bewegen bevor sie auf das Siebelement treffen. Dadurch wird ermöglicht, dass die Faserenden frei vom Faserver- band bewegt werden und deshalb nur geringe Kräfte notwendig sind um ab- stehende Fasern respektive Faserenden an den Faserverband anzulegen. Preferably, an inclination of the screen element against the direction of travel, as seen against the stretching field plane, causes the fiber ends, after leaving the second nip, to move through the free space in the fiber-bundling zone before they strike the screen element. This makes it possible for the fiber ends to be moved freely away from the fiber composite and therefore only small forces are necessary in order to apply abutting fibers or fiber ends to the fiber structure.

Weitere Vorteile der Erfindung sind in den nachfolgenden Ausführungsbei- spielen beschrieben. Es zeigen: Figur 1 eine schematische Darstellung eines Längsschnittes einer Spinnmaschine nach dem Stand der Technik, Further advantages of the invention are described in the following exemplary embodiments. Show it: 1 shows a schematic representation of a longitudinal section of a spinning machine according to the prior art,

Figur 2 eine schematische Darstellung eines Längsschnittes einer erfin- dungsgemässen Ausführungsform der Verdichtungsvorrichtung des Streckwerks und Figure 2 is a schematic representation of a longitudinal section of an inventive embodiment of the compression device of the drafting and

Figur 3 eine schematische Darstellung einer Draufsicht in Richtung X nach der Figur 2. FIG. 3 shows a schematic illustration of a plan view in the direction X according to FIG. 2.

Figur 1 zeigt eine schematische Darstellung eines Längsschnittes einer Spinnmaschine nach dem Stand der Technik, im Besonderen eine Ring- spinnmaschine. Gezeigt sind beispielhaft einzelne Bauteile der Spinnma- schine, nämlich ein Streckwerk 2 und eine Spinnvorrichtung 14. Das Streck- werk 2 besteht aus drei Walzenpaaren, einem Eingangswalzenpaar 5, einem Riemchenwalzenpaar 64 und einem Ausgangswalzenpaar 9. Das Riem- chenwalzenpaar 6 wird gebildet durch eine Oberwalze 7 und eine Unterwalze 8. Das Ausgangswalzenpaar 9 wird gebildet durch eine Ausgangsoberwalze 10 und eine Ausgangsunterwalze 11. Die beiden Walzen eines Walzenpaa- res werden gegeneinander gepresst und bilden an ihrem Berührungspunkt eine Klemmstelle, wobei die Klemmstelle K1 durch die Oberwalze 7 und die Unterwalze 8 und die Klemmstelle K2 durch das Ausgangswalzenpaar 9 zwi- schen der Ausgangsoberwalze 10 und der Ausgangsunterwalze 11 gebildet ist. Der in das Streckwerk 2 einlaufende Faserverband 1 durchläuft das Streckwerk 2 in Laufrichtung 3 und wird dabei zwischen den Walzen der Walzenpaare 3,4 und 5 durch die Klemmstellen geklemmt. Bedingt durch un- terschiedlichen Drehzahlen der Walzenpaare 3, 4 und 5 wird der Faserver- band 1 verstreckt. Dabei bilden die Klemmstellen K1 und K2 eine Streckfeld- ebene 4 aus. Während der Verstreckung wird der Faserverband 1 gleichzei- tig durch das Streckwerk 2 transportiert. Nach dem Verlassen des Streck- werks 2 gelangt der verstreckte Faserverband 12 zu einem Fadenführer 13 und wird weitergeführt zur Spinnvorrichtung 14. Die Spinnvorrichtung 14 be- steht im Wesentlichen aus einer Ringbank 18, welche den Spinnring 16 trägt, und einer Spindelbank 19, auf welcher die Spule 17 befestigt ist. Der Faser- verband 12 gelangt über einen Läufer 15 zur Spule 17. Zur Verspinnung des Faserverbandes 12 wird die Spule 17 in Drehung versetzt, dies hat zur Fol- ge, dass der Läufer 15 durch den Faserverband 12 auf dem Spinnring 16 ebenfalls in Drehung versetzt wird. Durch die unterschiedliche Drehge- schwindigkeit von Spule 17 und Läufer 15 wird dem Faserverband 12 eine Drehung erteilt und dadurch ein Garn gebildet welches durch ein auf und ab Bewegen der Ringbank 18 auf die Spule 17 aufgespult wird. Figure 1 shows a schematic representation of a longitudinal section of a spinning machine according to the prior art, in particular a ring spinning machine. By way of example, individual components of the spinning machine are shown, namely a drafting device 2 and a spinning device 14. The drafting device 2 consists of three pairs of rollers, an input roller pair 5, a pair of apron rollers 64 and an output roller pair 9. The pair of belt rollers 6 is formed by a pair of rollers Top roller 7 and a bottom roller 8. The output roller pair 9 is formed by an output top roller 10 and an output bottom roller 11. The two rollers of a pair of rollers are pressed against each other and form a nip at their point of contact, the nip K1 through the top roller 7 and the bottom roller 8 and the nip K2 is formed by the output roller pair 9 between the output top roller 10 and the output bottom roller 11. The entering into the drafting 2 fiber structure 1 passes through the drafting system 2 in the direction 3 and is clamped between the rollers of the roller pairs 3,4 and 5 through the clamping points. Due to different rotational speeds of the roller pairs 3, 4 and 5, the fiber composite 1 is stretched. The clamping points K1 and K2 form a draft field plane 4. During the drawing, the fiber structure 1 is simultaneously transported through the drafting system 2. After leaving the drafting system 2, the drawn fiber structure 12 reaches a yarn guide 13 and is continued to the spinning device 14. The spinning device 14 consists essentially of a ring rail 18, which carries the spinning ring 16, and a spindle rail 19, on which the coil 17 is fixed. The fiber composite 12 passes through a rotor 15 to the coil 17. To spin the fiber structure 12, the coil 17 is rotated, this has the consequence that the rotor 15 is also rotated by the fiber structure 12 on the spinning ring 16 in rotation becomes. Due to the different rotational speed of the spool 17 and the runner 15, the fiber structure 12 is given a rotation, thereby forming a yarn which is wound onto the spool 17 by moving the ring rail 18 up and down.

Figur 2 zeigt eine schematische Darstellung eines Längsschnittes einer er- findungsgemässen Ausführungsform einer Verdichtungsvorrichtung des Streckwerks. Das Riemchenwalzenpaar 6, bestehend aus einer Oberwalze 7 und einer Unterwalze 8 bildet eine erste Klemmstelle K1. Das Ausgangswal- zenpaar 9, bestehend aus der Ausgangsunterwalze 10 und der Ausgangs- oberwalze 11 bildet eine zweite Klemmstelle K2. Der zu verstreckende Fa- serverband 1 wird in Laufrichtung 3 durch die Walzenpaare 6 und 9 durch das Streckwerk geführt. Die Walzenpaare 6 und 9 bilden durch ihre Klemm- stellen K1 und K2 eine Streckfeldebene 4 aus. Die Ausgangsoberwalze 10 weist in ihrer Anordnung gegenüber der Ausgangsunterwalze 11 in der Streckfeldebene 4 in der Laufrichtung 3 gesehen einen Vorhang A von be- vorzugterweise 10 mm auf. Zudem hat die Ausgangsoberwalze 10 einen Durchmesser E welcher grösser ist als der Durchmesser F der Ausgangsun- terwalze 11 , wobei ein Verhältnis des Durchmessers E der Ausgangsober- walze 10 zum Durchmesser F der Ausgangsunterwalze 11 bevorzugterweise 1.79 beträgt. Aufgrund dieser bestimmten geometrischen Verhältnisse zwi- schen der Ausgangsoberwalze 10 und der Ausgangsunterwalze 11 werden ideale Bedingungen für die Bildung einer Faserbündelungszone 20 geschaf- fen. Nachfolgend an das Ausgangswalzenpaar 9 ist ein Saugrohr 21 angeordnet. Das Saugrohr 21 wird von einem Siebelement 22 umschlungen, welches als Endlos-Band ausgeführt ist und über eine Umlenkung 25 geführt ist. Im ge- zeigten Ausführungsbeispiel bildet das Siebelement 22 mit der Ausgangs- oberwalze 10 eine dritte Klemmstelle K3 für den verstreckten Faserverband. Die Form des Saugrohres 21 ist beispielhaft als ein Dreieck dargestellt. FIG. 2 shows a schematic representation of a longitudinal section of an embodiment according to the invention of a compression device of the drafting system. The Riemchenwalzenpaar 6, consisting of an upper roller 7 and a lower roller 8 forms a first nip K1. The output roller pair 9, consisting of the output lower roller 10 and the upper roller 11 forms a second terminal point K2. The fiber assembly 1 to be drawn is guided in the running direction 3 through the roller pairs 6 and 9 through the drafting system. Roller pairs 6 and 9 form a stretching field plane 4 through their clamping points K1 and K2. The output upper roller 10, viewed in its arrangement with respect to the lower output roller 11 in the stretching field plane 4 in the running direction 3, has a curtain A of preferably 10 mm. In addition, the output top roller 10 has a diameter E which is greater than the diameter F of the output bottom roller 11, wherein a ratio of the diameter E of the top roller 10 to the diameter F of the bottom roller 11 is preferably 1.79. Because of these particular geometrical relationships between the exit top roll 10 and the exit bottom roll 11, ideal conditions for the formation of a fiber bundle zone 20 are created. Subsequent to the output roller pair 9, a suction tube 21 is arranged. The suction tube 21 is looped by a sieve element 22, which is designed as an endless belt and is guided over a deflection 25. In the illustrated embodiment, the sieve element 22 forms, with the exit upper roller 10, a third clamping point K3 for the drawn fiber structure. The shape of the suction tube 21 is exemplified as a triangle.

Zwischen der zweiten Klemmstelle K2 und der dritten Klemmstelle K3 durch- läuft der verstreckte Faserverband die Faserbündelungszone 20. Die Faser- bündelungszone 20 bezeichnet den Raum, welcher durch die Ausgangs- oberwalze 10, die Ausgangsunterwalze 11 und das Saugrohr 21 umschlos- sen wird. Dabei wird von der zweiten Klemmstelle K2 zur dritten Klemmstelle K3 entlang einer Oberfläche der Ausgangsoberwalze 10 eine Klemmlänge B ausgebildet, welche geringer ist als eine mittlere Stapellänge des zu verstre- ckenden Faserverbandes 1. Das Saugrohr 21 weist in dieser Faserbünde- lungszone 20 eine Säugöffnung 24 auf. Die Säugöffnung 24 ist als schlitz- förmiger Durchbruch in der Wandung des Saugrohres 21 ausgeformt. Das Saugrohr 21 ist an eine Unterdruckquelle (nicht gezeigt) angeschlossen, dies bewirkt, dass über die Säugöffnung 24 und damit auch durch das über die Säugöffnung 24 gleitende Siebelement 22 Luft aus der Faserbündelungszo- ne 20 angesaugt wird. Durch die entstehende Luftströmung wird der ver- streckte Faserverband an das Siebelement 22 herangezogen, wobei einzel- ne vom verstreckten Faserverband abstehende Fasern oder Faserteile zur Säugöffnung 24 gefördert und damit an den verstreckten Faserverband an- geschmiegt werden. Während dieses Anschmiegevorganges werden die ein- zelnen Fasern des Faserverbandes aufgrund der kurzen Klemmlänge B mehrheitlich entweder durch die zweite Klemmstelle K2 oder die dritte Klemmstelle K3 gehalten, sodass nur die freistehenden Enden der Fasern in den Faserverband eingebunden werden. Ebenfalls bewirkt durch die Anord- nung der schlitzförmigen Säugöffnung 24 von einem der zweiten Klemmstelle K2 zugewandten Ende des Saugrohres 21 in Richtung der dritten Klemmstel- le K3, dass die Faserenden nach Verlassen der zweiten Klemmstelle K2 un- mittelbar von der Saugwirkung erfasst werden. Between the second nip K2 and the third nip K3, the stretched fiber strand passes through the fiber bundling zone 20. The fiber bundling zone 20 designates the space which is enclosed by the top roller 10, the bottom roller 11 and the suction tube 21. In this case, a clamping length B is formed from the second nip K2 to the third nip K3 along a surface of the topmost roller 10, which is less than an average staple length of the fiber structure to be stretched 1. The suction tube 21 has a mammal opening 24 in this fiber bundle zone 20 on. The mammal opening 24 is formed as a slot-shaped opening in the wall of the suction tube 21. The suction tube 21 is connected to a vacuum source (not shown) which causes air to be sucked out of the fiber-bundling zone 20 via the mammal opening 24 and thus also through the sieve element 22 sliding over the mammal opening 24. As a result of the resulting air flow, the stretched fiber structure is drawn onto the sieve element 22, whereby individual fibers or fiber parts projecting from the stretched fiber structure are conveyed to the mammal opening 24 and thus cling to the stretched fiber structure. During this fitting process, the individual fibers of the fiber structure due to the short clamping length B are held in majority by either the second nip K2 or the third nip K3, so that only the free-standing ends of the fibers are integrated into the fiber structure. Also caused by the arrangement of the slot-shaped mammal opening 24 of one of the second nip K2 facing the end of the suction tube 21 in the direction of the third Klemmstel le K3 that the fiber ends are detected directly after leaving the second nip K2 of the suction effect.

Weiter zeigt das Saugrohr 21 gegen die Faserbündelungszone 20 eine ebe- ne Fläche welche zu einer Senkrechten der Streckfeldebene 4 mit einem Winkel a von 62° gegen die Streckfeldebene 4 geneigt ist. Das Siebelement 22 welches das Saugrohr 21 umläuft ist mit einem Abstand C von 1.0 mm zur Ausgangsunterwalze 11 angeordnet. Dadurch wird eine durch die Aus- gangsoberwalze 10, die Ausgangsunterwalze 11 und das Saugrohr 21 ge- schlossene Faserbündelungszone 20 gebildet, sodass die durch die Sau- göffnung 24 angesaugte Umgebungsluft mehrheitlich von der Seite, also quer zur Bewegungsrichtung des Faserverbandes in die Faserbündelungs- zone 20 angesaugt wird. Furthermore, the suction tube 21 against the fiber-bundling zone 20 shows an even surface which is inclined to a vertical of the stretching-field plane 4 at an angle α of 62 ° with respect to the stretching-field plane 4. The sieve element 22 which circumscribes the suction tube 21 is arranged at a distance C of 1.0 mm from the output sub-roller 11. As a result, a fiber bundling zone 20 closed by the exit upper roller 10, the output lower roller 11 and the suction tube 21 is formed so that the ambient air sucked in through the suction opening 24 is mostly from the side, ie transversely to the direction of movement of the fiber bundle into the fiber bundling zone 20 is sucked.

Das Siebelement 22 wird von der Ausgangsoberwalze 10 über die entste- hende Reibkraft in der dritten Klemmstelle K3 in Bewegung versetzt, wodurch der verstreckte Faserverband aus der Faserbündelungszone 20 der dritten Klemmstelle K3 zugeführt wird. Der verdichtete Faserverband 23 ver- lässt anschliessend das Siebelement 22, dabei wird eine möglichst geringe Auskragung des Saugrohres 21 über die dritte Klemmstelle K3 hinaus ange- strebt. Der verdichtete Faserverband 23 wird an die Spinnvorrichtung 14 res- pektive den der Spinnvorrichtung 14 vorgelagerten Fadenführer 13 der Spinnmaschine übergeben (siehe Figur 1 ). Durch die Geometrie des Saug- rohres 21 wird es ermöglicht die notwendige Einlaufgeometrie für eine ein- wandfreie Funktion der Spinnvorrichtung 14 trotz der zusätzlichen Anordnung der Verdichtungsvorrichtung beizubehalten. The sieve element 22 is set in motion by the output top roller 10 via the resulting frictional force in the third clamping point K3, whereby the stretched fiber structure from the fiber bundling zone 20 is fed to the third clamping point K3. The compacted fiber structure 23 subsequently leaves the sieve element 22, in which case the smallest possible projection of the suction tube 21 is aimed beyond the third clamping point K3. The compacted fiber structure 23 is transferred to the spinning device 14 in the direction of the yarn guide 13 of the spinning machine upstream of the spinning device 14 (see FIG. 1). The geometry of the suction tube 21 makes it possible to maintain the necessary inlet geometry for a perfect functioning of the spinning device 14 despite the additional arrangement of the compacting device.

Figur 3 zeigt eine schematische Darstellung einer Draufsicht in Richtung X nach der Figur 2. In der Darstellung ist die Ausgangsoberwalze 10 angedeu- tet, sodass das um das Saugrohr 21 umlaufende Siebelement 22 zu sehen ist. Im unter dem Siebelement 22 liegenden Saugrohr 21 ist eine schlitzför mige Säugöffnung 24 mit einer Länge L vorgesehen. Der über das Siebele- ment 22 laufende Faserverband 23 zeigt abstehende Faserenden im Bereich dem Ende der Säugöffnung 24 welche der Ausgangsunterwalze 11 zuge- wandt ist. Im Verlauf der Säugöffnung 24 in Laufrichtung 3 werden die abste- henden Faserenden durch die Wirkung der quer zur Laufrichtung 3 an die Säugöffnung 24 herangesagten Umgebungsluft an den Faserverband 23 an- gelegt. FIG. 3 shows a schematic representation of a plan view in the direction X according to FIG. 2. In the illustration, the output top roller 10 is indicated, so that the screen element 22 revolving around the suction tube 21 can be seen. In lying below the strainer 22 suction tube 21 a schlitzför shaped mammal opening 24 is provided with a length L. The over the Siebele- 22 running fiber structure 23 shows protruding fiber ends in the region of the end of the mammal opening 24 which the output sub-roller 11 is facing. In the course of the mammal opening 24 in the running direction 3, the projecting fiber ends are applied to the fiber structure 23 by the action of the ambient air, which is directed toward the mammal opening 24 transversely to the running direction 3.

Bezuqszeichenliste LIST OF REFERENCES

1 Faserverband 1 fiber structure

2 Streckwerk  2 drafting system

3 Laufrichtung  3 direction

4 Streckfeldebene  4 stretch field plane

5 Eingangswalzenpaar  5 input roller pair

6 Riemchenwalzenpaar  6 pair of apron rollers

7 Oberwalze  7 top roller

8 Unterwalze  8 bottom roller

9 Ausgangswalzenpaar  9 outgoing roller pair

10 Ausgangsoberwalze  10 output top roller

11 Ausgangsunterwalze  11 output sub-roller

12 Verstreckter Faserverband  12 Stretched fiber bandage

13 Fadenführer  13 thread guides

14 Spinnvorrichtung  14 spinning device

15 Läufer  15 runners

16 Spinnring  16 spinning ring

17 Spule  17 coil

18 Ringbank  18 ring bank

19 Spindelbank  19 spindle bank

20 Faserbündelungszone  20 fiber bundling zone

21 Saugrohr  21 intake manifold

22 Siebelement  22 sieve element

23 Verdichteter Faserverband  23 Compacted fiber bandage

24 Säugöffnung  24 mammal opening

25 Umlenkung  25 diversion

a Neigungswinkel Saugrohr a Tilt angle intake manifold

A Vorhang Ausgangsoberwalze A curtain outlet top roller

B Abstand Klemmstellen C Abstand Ausgangsunterwalze und SaugrohrB distance clamping points C Distance output sub-roller and intake manifold

E Durchmesser Ausgangsoberwalze E diameter output top roller

F Durchmesser Ausgangsunterwalze  F diameter output sub-roller

K1 Erste Klemmstelle  K1 First nip

K2 Zweite Klemmstelle  K2 second clamping point

K3 Dritte Klemmstelle  K3 Third nip

L Länge schlitzförmige Säugöffnung  L-length slit-shaped mammal opening

Claims

P a t e n t a n s p r ü c h e Patent claims 1. Streckwerk (2) für eine Spinnmaschine zum Verstrecken eines Faser- verbandes (1 ) mit zumindest einem ersten Walzenpaar (6) bestehend aus einer Oberwalze (7) und einer Unterwalze (8), und mit einem zweiten Walzenpaar (9) bestehend aus einer Ausgangsoberwalze (11 ) und einer Ausgangsunterwalze (12), wobei eine erste Klemmstelle (K1 ) durch das erste Walzenpaar (6) und eine zweite Klemmstelle (K2) durch das zweite Walzenpaar (9) definiert ist und die erste Klemmstelle (K1 ) und die zweite Klemmstelle (K2) eine Streckfeld- ebene (4) ausbilden, welche vom Faserverband (1 ) in einer Laufrich- tung (3) von der ersten Klemmstelle (K1 ) zur zweiten Klemmstelle (K2) durchlaufen wird, und mit einer dem Ausgangswalzenpaar (9) nach- geordneten Faserverdichtungszone zur Verdichtung des verstreckten Faserverbandes, welche eine pneumatische Verdichtungsvorrichtung mit einer Faserbündelungszone (20) und mit einem von einem Sie- belement (22) umschlungenen und besaugbaren Saugrohr (21 ) auf- weist, wobei die Faserbündelungszone (20) durch die zweite Klemm- stelle (K2) und eine dritte Klemmstelle (K3) begrenzt ist, wobei die drit- te Klemmstelle (K3) durch die Ausgangsoberwalze (10) und das Sie- belement (22) gebildet ist, dadurch gekennzeichnet, dass das Saug- rohr (21 ) eine schlitzförmige Säugöffnung (24) mit einer Länge (L) von 2.0 mm bis 5.0 mm aufweist, welche in der Faserbündelungszone (20) angeordnet ist, wobei die schlitzförmige Säugöffnung (24) im Saugrohr (21 ) von einem der zweiten Klemmstelle (K2) zugewandten Ende des Saugrohres (21 ) in Richtung der dritten Klemmstelle (K3) angeordnet ist. 1. drafting system (2) for a spinning machine for stretching a fiber composite (1) with at least a first pair of rollers (6) consisting of an upper roller (7) and a lower roller (8), and with a second roller pair (9) consisting of an output top roller (11) and an output bottom roller (12), wherein a first nip (K1) is defined by the first roller pair (6) and a second nip (K2) is defined by the second roller pair (9) and the first nip (K1) and the second clamping point (K2) forms a draft field plane (4) which is traversed by the fiber structure (1) in a running direction (3) from the first clamping point (K1) to the second clamping point (K2), and with one pair of the output rollers (9) secondary fiber compaction zone for compaction of the drawn fiber structure, which comprises a pneumatic compaction device with a fiber bundling zone (20) and with a suction pipe (21) looped and sucked by a sieve element (22) wherein the fiber-bundling zone (20) is bounded by the second nip (K2) and a third nip (K3), the third nip (K3) being formed by the top-end roll (10) and the sifting member (22) characterized in that the suction tube (21) has a slot-shaped mammal opening (24) with a length (L) of 2.0 mm to 5.0 mm, which is arranged in the fiber-bundling zone (20), wherein the slot-shaped mammal opening (24) in the suction pipe (21) from one of the second clamping point (K2) facing the end of the suction pipe (21) in the direction of the third clamping point (K3) is arranged. 2. Streckwerk (2) nach Anspruch 1 , dadurch gekennzeichnet, dass ein Abstand (B) von der zweiten Klemmstelle (K2) zur dritten Klemmstelle (K3) entlang einer Oberfläche der Ausgangsoberwalze (10) geringer ist als eine mittlere Stapellänge des zu verstreckenden Faserverban- des (1 ). 2. drafting system (2) according to claim 1, characterized in that a distance (B) from the second nip (K2) to the third nip (K3) along a surface of the Ausgangsoberwalze (10) lower is a mean staple length of the fiber composite (1) to be drawn. 3. Streckwerk (2) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Säugöffnung (24) in einer ebenen Fläche des Saugrohres (21 ) in der Faserbündelungszone (20) angeordnet ist. 3. drafting system (2) according to claim 1 or 2, characterized in that the mammal opening (24) in a flat surface of the suction tube (21) in the fiber bundling zone (20) is arranged. 4. Streckwerk (2) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Säugöffnung (24) in einer gekrümmten Fläche des Saugroh- res (21 ) in der Faserbündelungszone (20) angeordnet ist, wobei die Krümmung kleiner als 0.04 (1/mm) beträgt. 4. drafting system (2) according to claim 1 or 2, characterized in that the mammal opening (24) is arranged in a curved surface of the Saugroh- res (21) in the fiber bundling zone (20), wherein the curvature is less than 0.04 (1 / mm). 5. Streckwerk (2) nach Anspruch 3, dadurch gekennzeichnet, dass die ebene Fläche des Saugrohres (21 ) zu einer Senkrechten zur Laufrich- tung (3) um einen Winkel (a) von 45° bis 75° gegen die Streckfeld- ebene (4) geneigt ist. 5. drafting system (2) according to claim 3, characterized in that the flat surface of the suction tube (21) to a perpendicular to the running direction (3) by an angle (a) of 45 ° to 75 ° against the Yield field plane ( 4) is inclined. 6. Streckwerk (2) nach Anspruch 4, dadurch gekennzeichnet, dass eine Tangente in der dritten Klemmstelle (K3) an die gekrümmte Fläche des Saugrohres (21 ) zu einer Senkrechten zur Laufrichtung (3) um ei- nen Winkel (a) von 45° bis 75° gegen die Streckfeldebene (4) geneigt ist. 6. drafting system (2) according to claim 4, characterized in that a tangent in the third clamping point (K3) to the curved surface of the suction tube (21) to a perpendicular to the running direction (3) by an angle (a) of 45th ° is inclined to 75 ° to the stretching field plane (4). 7. Streckwerk (2) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass ein radialer Abstand (C) zwischen der Ausgangsunterwalze (11 ) und dem am Saugrohr (21 ) anliegenden Siebelement (22) 0.4 mm bis 2.0 mm beträgt. 7. drafting system (2) according to one or more of the preceding claims, characterized in that a radial distance (C) between the output lower roller (11) and the suction tube (21) adjacent the sieve element (22) is 0.4 mm to 2.0 mm. 8. Streckwerk (2) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass die schlitzförmige Säugöffnung (24) in einer Längsausdehnung innerhalb von ± 15 Winkelgraden geneigt zur Laufrichtung (3) angeordnet ist. 8. drafting system (2) according to one or more of the preceding claims, characterized in that the slot-shaped mammal opening (24) is arranged in a longitudinal extent within ± 15 degrees inclined to the running direction (3). 9. Streckwerk (2) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Saugrohr (21 ) in einer Laufrichtung des Siebeielements (22) weniger als 5 mm über die dritte Klemmstelle (K3) auskragt. 9. drafting system (2) according to one or more of the preceding claims, characterized in that the suction tube (21) in a running direction of the Siebeielements (22) projects less than 5 mm beyond the third nip (K3). 10. Streckwerk (2) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Ausgangsoberwalze (10) in der Streckfeldebene (4) in Laufrichtung gesehen einen Vorhang (A) ge- genüber der Ausgangsunterwalze (11 ) aufweist. 10. drafting system (2) according to one or more of the preceding claims, characterized in that the Ausgangsoberwalze (10) seen in the stretching field plane (4) in the running direction a curtain (A) compared to the output lower roller (11). 11. Streckwerk (2) nach Anspruch 9, dadurch gekennzeichnet, dass der Vorhang (A), gemessen in der Streckfeldebene (4), zwischen 2 mm und 15 mm und/oder das Verhältnis des Durchmessers (E) der Aus- gangsoberwalze (10) zum Durchmesser (F) der Ausgangsunterwalze (11 ) 1 ,4 bis 2,5 beträgt. 11. drafting system (2) according to claim 9, characterized in that the curtain (A), measured in the stretching field plane (4), between 2 mm and 15 mm and / or the ratio of the diameter (E) of the top top roll (10 ) to the diameter (F) of the output sub-roller (11) is 1.4 to 2.5. 12. Ringspinnmaschine dadurch gekennzeichnet, dass zumindest ein Streckwerk (2) nach einem der Ansprüche 1 bis 11 vorgesehen ist. 12. A ring spinning machine characterized in that at least one drafting device (2) is provided according to one of claims 1 to 11. 13. Verfahren zur Verdichtung eines aus Einzelfasern bestehender Faser- verbandes (1 ) in einer Spinnmaschine mit zumindest einem ersten Walzenpaar (6) bestehend aus einer Oberwalze (7) und einer Unter- walze (8), und mit einem zweiten Walzenpaar (9) bestehend aus einer Ausgangsoberwalze (10) und einer Ausgangsunterwalze (11 ), wobei eine erste Klemmstelle (K1 ) durch das erste Walzenpaar (6) und eine zweite Klemmstelle (K2) durch das zweite Walzenpaar (9) definiert werden, und durch die erste Klemmstelle (K1 ) und die zweite Klemm- stelle (K2) eine Streckfeldebene (4) ausgebildet wird, welche vom Fa- serverband (1 ) in einer Laufrichtung (3) von der ersten Klemmstelle (K1 ) zur zweiten Klemmstelle (K2) durchlaufen wird, und mit einer dem Ausgangswalzenpaar (9) nachgeordneten Faserverdichtungszo- ne zur Verdichtung des verstreckten Faserverbandes, welche eine pneumatische Verdichtungsvorrichtung mit einer Faserbündelungszo- ne (20) und mit einem von einem Siebelement (22) umschlungenen und besaugbaren Saugrohr (21 ) mit einer Säugöffnung (24) aufweist, wobei die Faserbündelungszone (20) durch die zweite Klemmstellen (K2) und eine dritte Klemmstelle (K3) begrenzt wird, wobei die dritte Klemmstelle (K3) durch die Ausgangsoberwalze (10) und das Sie- belement (22) gebildet wird, dadurch gekennzeichnet, dass der Faser- verband nach der zweiten Klemmstelle (K2) durch das Siebelement (22) über die Säugöffnung (24) zur dritten Klemmstelle (K3) geführt wird und dass die einzelnen Fasern vor Verlassen der zweiten 13. Method for compacting a fiber composite consisting of individual fibers (1) in a spinning machine with at least one first pair of rollers (6) consisting of a top roller (7) and a bottom roller (8), and a second roller pair (9) consisting of a Ausgangsoberwalze (10) and a Ausgangsunterwalze (11), wherein a first nip (K1) by the first pair of rollers (6) and a second nip (K2) by the second pair of rollers (9) are defined, and by the first nip (K1) and the second clamping point (K2) is formed by a stretching field plane (4) which is traversed by the fiber dressing (1) in a running direction (3) from the first clamping point (K1) to the second clamping point (K2), and with a Faserverdichtungszo- downstream of the output roller pair (9) ne for densifying the drawn fiber structure comprising a pneumatic compacting device having a fiber bundling zone (20) and a suction tube (21) with a mammalian opening (24) which is looped and suctioned by a sieve element (22), the fiber bundling zone (20) passing through the second clamping points (K2) and a third clamping point (K3) is limited, wherein the third clamping point (K3) by the Ausgangsoberwalze (10) and the sieve (22) is formed, characterized in that the fiber composite after the second nip (K2) is passed through the screen element (22) via the mammal opening (24) to the third nip (K3) and that the individual fibers before leaving the second Klemmstelle (K2) durch die dritte Klemmstelle (K3) erfasst werden, wobei aus dem Faserverband abstehende Faserenden beim Überfah- ren der Säugöffnung (24) an den Faserverband angelegt werden.  Clamping point (K2) by the third terminal point (K3) are detected, wherein projecting from the fiber structure fiber ends are applied when overflow of the mammal opening (24) to the fiber structure. 14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass die 14. The method according to claim 13, characterized in that the Mehrheit der Fasern nicht frei von einer Klemmung vom Siebelement (22) von der zweiten Klemmstelle (K2) zur dritten Klemmstelle (K3) transportiert werden.  Most of the fibers are not transported free of a clamping from the screen element (22) from the second nip (K2) to the third nip (K3). 15. Verfahren nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass durch eine Neigung (a) des Siebelementes (22) entgegen der Lauf- richtung (3) gesehen gegen die Streckfeldebene (4) die Faserenden nach dem Verlassen der zweiten Klemmstelle (K2) sich durch den freien Raum in der Faserbündelungszone (20) bewegen bevor sie auf das Siebelement (22) treffen. 15. The method according to claim 13 or 14, characterized in that by an inclination (a) of the screen element (22) opposite to the running direction (3) seen against the stretching field plane (4) the fiber ends after leaving the second nip (K2) to move through the free space in the fiber bundling zone (20) before hitting the screen element (22).
EP18815979.2A 2017-12-15 2018-12-03 Drafting unit for a spinning machine comprising a compaction device, and method for compacting a fibre bundle Active EP3724385B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01530/17A CH714447A1 (en) 2017-12-15 2017-12-15 Drafting system for a spinning machine with a compacting device and method for compacting a fiber structure.
PCT/EP2018/083350 WO2019115270A1 (en) 2017-12-15 2018-12-03 Drawing frame for a spinning machine comprising a compaction device, and method for compacting a fibre composite

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DE102019128326A1 (en) 2019-10-21 2021-04-22 Saurer Spinning Solutions Gmbh & Co. Kg Compaction device for a drafting device of a spinning machine and drafting device for a compression device

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WO2019115270A1 (en) 2019-06-20
CN111479961A (en) 2020-07-31
CN111479961B (en) 2023-02-03
CH714447A1 (en) 2019-06-28
EP3724385B1 (en) 2023-01-25

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