EP3724383B1 - Drawing frame for a spinning machine comprising a compaction device - Google Patents
Drawing frame for a spinning machine comprising a compaction device Download PDFInfo
- Publication number
- EP3724383B1 EP3724383B1 EP18814847.2A EP18814847A EP3724383B1 EP 3724383 B1 EP3724383 B1 EP 3724383B1 EP 18814847 A EP18814847 A EP 18814847A EP 3724383 B1 EP3724383 B1 EP 3724383B1
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- EP
- European Patent Office
- Prior art keywords
- roller
- fiber
- drafting system
- clamping point
- output roller
- Prior art date
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- 238000009987 spinning Methods 0.000 title claims description 30
- 238000005056 compaction Methods 0.000 title description 5
- 239000000835 fiber Substances 0.000 claims description 136
- 238000007378 ring spinning Methods 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 description 16
- 238000007906 compression Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 6
- 239000003570 air Substances 0.000 description 5
- 229920006240 drawn fiber Polymers 0.000 description 5
- 206010020112 Hirsutism Diseases 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 206010010774 Constipation Diseases 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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 compressing drafted slivers in a spinning machine.
- Drafting devices for spinning machines comprise at least two pairs of rollers between which a fiber structure is drawn due to the different speeds of the pairs of rollers.
- the pair of rollers after which the drafted fiber structure leaves the drafting system and is fed to a spinning device is referred to as the pair of exit rollers.
- the pair of output rollers consists of an output upper roller and an output lower roller, which form a nip through which the fiber strand is conveyed.
- Devices for compressing the stretched fiber structure are arranged after the exit roller pair, mechanical as well as pneumatic compression devices are used.
- the compacting device disclosed therein is of a pneumatic design and essentially consists of a suction shoe, a perforated transport means and a drive roller for the compacting device.
- the fiber bundle leaving the pair of output rollers of the drafting system is placed on the perforated transport means and guided by it via the suction shoe to a pair of delivery rollers.
- a disadvantage of the disclosed device is, in addition to an additionally required drive shaft for the perforated transport means and the pair of delivery rollers, that a long fiber bundling zone is provided, whereby the individual fibers of the drawn product The fiber structure can be moved over the suction shoe without being clamped. This can lead to a loss of the stretching of the fiber structure determined by the drafting system.
- the DE 199 22 861 A1 discloses a method for compressing a drafted fiber structure in a compression zone following a pair of output rollers of a drafting system.
- the fiber structure is transported through the compression zone by means of a perforated, vacuum-extracted conveyor belt. It is provided that the fiber strand has the same direction of movement as the transport means when it reaches the compression zone. Furthermore, care is taken to ensure that a sufficient quantity of the fibers in the fiber structure is still clamped by the pair of exit rollers during compression. This leads to the advantage that the front ends of the fibers of the fiber assembly to be compressed do not dip into the perforation of the conveyor belt and thereby lead to constipation.
- the distance between the two clamping points is selected so that it is at most slightly larger, but preferably smaller than the average staple length of the fibers in the fiber structure. Densification takes place in the drafting field level by compressing the fiber structure in which the fibers are displaced transversely to their longitudinal axis. The hairiness of the fiber structure is hardly affected by this.
- the object of the present invention is to further develop known devices and to create a compacting device that is simple in construction and can be used at individual spinning stations, which is characterized by a uniform reduction in the hairiness of the fiber structure.
- Proposed is a drafting system for a spinning machine for drawing a fiber structure, with at least a first pair of rollers consisting of an upper roller and a lower roller, and with a second pair of rollers consisting of an output upper roller and an output lower roller, and with a fiber compression downstream of the output roller pair for compressing the drawn fiber structure .
- the fiber compaction has a pneumatic compaction device with a fiber bundling zone and with a suction tube that is wrapped around by a screen element and that can be sucked out.
- a first nip point is defined by the first pair of rollers and a second nip point by the second pair of rollers, and the first nip point and the second nip point form a drafting field plane through which the fiber strand runs in a running direction from the first nip point to the second nip point.
- the upper exit roller Seen in the direction of travel of the fiber structure, has a curtain opposite the lower exit roller in the drafting field plane and a third nip is defined by the exit top roller and the screen element.
- a nip length from the second nip point to the third nip point along a surface of the output top roller is less than an average staple length of the fiber structure to be drawn.
- a suction pipe is arranged after the pair of output rollers. Which is at least partially wrapped by a screen element.
- a fiber bundling zone is located between the second and the third nip, enclosed by the screening element and the elements forming the second nip. In this fiber bundling zone, the drawn fiber structure leaving the second clamping point is bundled.
- the fiber bundle emerging from the pair of output rollers hits the screen element shortly before reaching the third nip point and is guided on it to the third nip point. In this way, the fiber structure is bundled by the influence of an air current.
- the sieve element runs around the suction pipe, which has a suction opening in the area between the second and the third clamping point.
- the ambient air sucked in through the suction opening means that individual fibers protruding from the fiber structure are moved to the suction opening and the fiber structure is thus bundled.
- conventional pneumatic compaction in which the fiber structure is moved on a screen element transversely to its direction of travel and the fibers are thus pushed together, with fiber bundling only fiber parts or fiber ends protruding from the fiber structure are brought up to the fiber structure without the fiber structure being deflected from its direction of travel .
- the fiber ends are guided to the fiber structure by a pneumatic suction flow and applied to the fiber structure in the third clamping point.
- the suction tube and thus the screen element are advantageously brought as close as possible to the second clamping point.
- a nip length is formed along a surface of the output top roller, which is smaller than an average fiber staple length of the fiber strand to be compressed.
- the fiber bundle is transported in a defined manner from the second to the third clamping point.
- the fiber bundling zone only the fiber parts protruding from the fiber structure are brought into the fiber strand.
- the air flow ensures that fiber parts or fiber ends protruding from the fiber structure are guided to the fiber structure, with the fiber structure itself not being transported directly through the screen element, but instead passing through the fiber bundling zone held by the clamping points. This eliminates the so-called hairiness of the fiber structure and binds the hair into the fiber structure.
- the constant clamping of at least one fiber end also prevents the fiber structure from losing or partially losing the stretching applied in the drafting system while passing through the fiber bundling zone.
- the screen element is also driven by the output top roller through the third clamping point.
- the frictional drive of the screen element creates a slight slip, so that the screen element has a lower speed than the output roller pair. This circumstance also contributes to the fact that bundling of the fiber assembly, or integration of protruding fiber ends in the fiber assembly, becomes possible.
- the curtain of the upper exit roller compared to the lower exit roller, measured in the drafting zone is 2 mm to 15 mm, particularly preferably 5 mm to 12 mm.
- the curtain of the upper exit roller opposite the lower exit roller enables the third nip to be located close to the second nip.
- the ratio of the diameter of the top roller to the diameter of the bottom roller is 1.4 to 2.5.
- the enlargement of the upper exit roller compared to the lower exit roller improves the spatial arrangement of the fiber bundling zone.
- the upper exit roller preferably has a diameter of 34 mm to 60 mm and the lower exit roller has a diameter of 24 mm to 36 mm.
- the selected diameters of the rollers lead to the creation of a fiber bundling zone that is not too large and avoid excessive deviations in the further course of the fiber structure after the compression device to a spinning device after the compression device has been attached to existing spinning machines. A further conversion of the spinning machine, for example by changing the arrangement of the drafting field level, to maintain the process conditions prevailing before the compaction device was attached is therefore not necessary.
- the nip length from the second nip point to the third nip point along a surface of the output top roller is preferably 12 mm to 20 mm.
- the protruding fiber parts are bundled into a fiber structure in such a way that they are securely integrated in the subsequent spinning process. As a result, other fiber parts are used for substance utilization in the yarn compared to an uncompacted fiber structure.
- the short clamping length has the advantage that only the free fiber ends are moved and the fiber bundling forces only have to overcome the stiffness of the individual fibers.
- the screen element is advantageously deflected after the third clamping point in such a way that a detachment point on a surface of the screen element at which the compacted fiber strand detaches from the screen element is less than 10 mm, preferably less than 5 mm, away from the third clamping point. It is also advantageous if the detachment point in the radial direction of the output top roller of the third nip is less than 4 mm away from a surface of the output top roller.
- the shortest possible guidance of the fiber structure through the sieve element after the third clamping point results in further advantages for the geometric arrangement of the subsequent spinning device. This also minimizes the risk of the fiber structure shifting laterally on the sieve element and thus damage to the previously bundled fiber structure.
- the upper exit roller preferably has a shorter axial length than the lower exit roller. This results in the advantage that tilting of the axes of the upper output roller and the lower output roller is largely avoided. Even with increasing wear of the linings of the output rollers, good running reliability and maintenance of the second and third nip point is achieved.
- the compression device is advantageously arranged on a machine frame of the spinning machine or on the drafting system.
- the attachment is preferably arranged on a pressure arm of the drafting system.
- lifting the pressure arm which usually also carries the top rollers of the pairs of drafting rollers, not only is the entire drafting system opened, but the compacting device is also raised. This has advantages for the maintenance of the drafting systems.
- a ring spinning machine is proposed with at least one drafting system for compressing a fiber structure in a spinning machine according to the above description.
- 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 by way of example, namely a drafting system 2 and a spinning device 10.
- the drafting system 2 consists of three pairs of rollers, an input roller pair 3, a strap roller pair 4 and an output roller pair 5.
- the output roller pair 5 is formed by an output upper roller 6 and an output lower roller 7.
- the two rollers of a roller pair 3, 4 and 5 are pressed against each other and form a nip point at their point of contact, with a first nip point K1 through the apron roller pair 4 and a second nip point K2 through the output roller pair 5 is formed between the output top roller 6 and the output bottom roller 7 .
- the nip formed by the input roller pair 3 is not essential.
- the fiber structure 1 entering the drafting system 2 is between the rollers of the roller pairs 3, 4 and 5 is clamped by the nip points of the pair of input rollers and K1 and K2 and stretched due to the different speeds of the pairs of rollers 3, 4 and 5.
- the fiber structure 1 is transported through the drafting system 2 at the same time.
- the pairs of rollers 3, 4 and 5 form a drafting field plane which is inclined towards a spinning device 10.
- the drafted fiber structure 8 reaches a thread guide 9 and is carried on to the spinning device 10.
- the course of the drafted fiber structure 8 from the drafting system 2 to the thread guide 9 has a significant impact on the operational reliability of the spinning device and the quality of the yarn to be produced with it.
- the spinning device 10 consists essentially of a ring rail 14, which carries the spinning ring 12, and a spindle rail 15, on which the coil 13 is attached.
- the fiber structure 8 arrives at the spool 13 via a rotor 11.
- the spool 13 is set in rotation, with the result that the rotor 11 is also set in rotation by the fiber structure 8 on the ring 12. Due to the different rotational speeds of the bobbin 13 and the rotor 11, the fiber strand 8 is rotated and a yarn is thereby formed which is wound onto the bobbin 13 by moving the ring rail 14 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 apron roller pair 4 consisting of an upper roller 16 and a lower roller 17 forms a first nip K1.
- the output roller pair 5, consisting of the output lower roller 7 and the output upper roller 6 forms a second nip K2.
- the fiber strand 1 to be drafted is guided in the running direction 25 by the pairs of rollers 4 and 5 through the drafting system.
- the pairs of rollers 4 and 5 form a drawing field plane 24 through their clamping points K1 and K2.
- the output top roller 6 has seen from their arrangement opposite the output bottom roller 7 in the drafting zone plane 24 in the running direction 25 a curtain A.
- the upper exit roller 6 has a diameter D which is greater than the diameter E of the lower exit roller 7. Due to these specific geometric relationships between the upper exit roller 6 and the lower exit roller 7, ideal conditions for the formation of a fiber bundling zone 18 are created.
- a suction pipe 19 is arranged following the output roller pair 5, a suction pipe 19 is arranged.
- the suction tube 19 is wrapped around by a sieve element 21, which is designed as an endless belt and is guided over a deflection 22.
- the screen element 21 forms a third nip point K3 for the drafted fiber bundle with the output top roller 6 .
- the shape of the intake manifold 19 is shown as a polygon, but any other shape such as a triangle, ellipse, etc. is also possible.
- a nip length B is formed from the second nip point K2 to the third nip point K3 along a surface of the output top roller 6, which is less than an average staple length of the fiber structure 1 to be drawn.
- the suction tube 19 has a suction opening 20 in this fiber bundling zone 18.
- the suction opening 20 is preferably formed as a slit-shaped opening in the wall of the suction pipe 19.
- the suction pipe 19 is connected to a vacuum source (not shown), which causes air to be sucked out of the fiber bundling zone 18 via the suction opening 20 and thus also through the screen element 21 sliding over the suction opening 20 . Due to the resulting air flow, the stretched Fiber structure used on the screen element 21, with individual fibers or fiber parts protruding from the drawn fiber structure being conveyed to the suction opening 20 and thus clinging to the drawn fiber structure. During this clinging process, the individual fibers of the fiber structure are mostly held either by the second clamping point K2 or the third clamping point K3 due to the short clamping length B, so that only the free ends of the fibers are tied into the fiber structure.
- the screen element 21 is set in motion by the output top roller 6 via the resulting frictional force in the third clamping point K3, as a result of which the drafted fiber structure is fed from the fiber bundling zone 18 to the third clamping point K3.
- the compacted fiber structure 23 then leaves the screen element 21 at a detachment point 26, which does not correspond to the third clamping point K3.
- the compacted fiber structure 23 is transferred from the detachment point 26 to the spinning device 10 or to the thread guide 9 of the spinning machine located upstream of the spinning device 10 (see FIG figure 1 ).
- the geometry of the suction pipe 19 and the resulting arrangement of the detachment point 26 makes it possible to maintain the necessary inlet geometry for the perfect functioning of the spinning device despite the additional arrangement of the compression device.
- a length C, which the compressed fiber structure covers from the third clamping point K3 to the detachment point 26 on the screen element 21, is less than 10 mm.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Description
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 compressing drafted slivers in a spinning machine.
Streckwerke für Spinnmaschinen umfassen zumindest zwei Walzenpaare zwischen denen ein Faserverband aufgrund der unterschiedlichen Drehzahlen der Walzenpaare verstreckt wird. Das Walzenpaar nach welchem der verstreckte Faserverband das Streckwerk verlässt und einer Spinnvorrichtung zugeführt wird, wird als Ausgangswalzenpaar bezeichnet. Das Ausgangswalzenpaar besteht aus einer Ausgangsoberwalze und einer Ausgangsunterwalze, welche eine Klemmstelle bilden durch welche der Faserverband gefördert wird. Vorrichtungen zur Verdichtung des verstreckten Faserverbandes werden nach dem Ausgangswalzenpaar angeordnet, dabei kommen mechanische wie auch pneumatische Verdichtungsvorrichtungen zum Einsatz.Drafting devices for spinning machines comprise at least two pairs of rollers between which a fiber structure is drawn due to the different speeds of the pairs of rollers. The pair of rollers after which the drafted fiber structure leaves the drafting system and is fed to a spinning device is referred to as the pair of exit rollers. The pair of output rollers consists of an output upper roller and an output lower roller, which form a nip through which the fiber strand is conveyed. Devices for compressing the stretched fiber structure are arranged after the exit roller pair, mechanical as well as pneumatic compression devices are used.
Gattungsgemäße Vorrichtungen sind im Stand der Technik bekannt und kommen immer dann zum Einsatz, wenn ein Faserband nach einem Verstreckungsvorgang in einer Spinnmaschine verdichtet werden muss. Beschrieben ist eine entsprechende Vorrichtung beispielsweise in der
Weiter offenbart die
Die
Aufgabe der vorliegenden Erfindung ist es, bekannte Vorrichtungen weiterzubilden und eine im konstruktiven Aufbau einfache und an einzelnen Spinnstellen einsetzbare Verdichtungsvorrichtung zu schaffen, welche sich durch eine gleichmäßige Verminderung der Haarigkeit des Faserverbandes auszeichnet.The object of the present invention is to further develop known devices and to create a compacting device that is simple in construction and can be used at individual spinning stations, which is characterized by a uniform reduction in the hairiness of the fiber structure.
Die Aufgabe wird gelöst durch ein Streckwerk mit den Merkmalen des unabhängigen Patentanspruchs.The problem is solved by a drafting system with the features of the independent patent claim.
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 Walzenpaar bestehend aus einer Ausgangsoberwalze und einer Ausgangsunterwalze, und mit einer dem Ausgangswalzenpaar nachgeordneten Faserverdichtung zur Verdichtung des verstreckten Faserverbandes. Die Faserverdichtung weist eine pneumatische Verdichtungsvorrichtung mit einer Faserbündelungszone und mit einem von einem Siebelement umschlungenen und besaugbaren Saugrohr auf. Dabei ist eine erste Klemmstelle durch das erste Walzenpaar und eine zweite Klemmstelle durch das zweite Walzenpaar definiert und die erste Klemmstelle und die zweite Klemmstelle bilden eine Streckfeldebene aus, welche vom Faserverband in einer Laufrichtung von der ersten Klemmstelle zur zweiten Klemmstelle durchlaufen wird. Die Ausgangsoberwalze weist in der Streckfeldebene in Laufrichtung des Faserverbandes gesehen einen Vorhang gegenüber der Ausgangsunterwalze auf und es ist eine dritte Klemmstelle durch die Ausgangsoberwalze und das Siebelement definiert. Dabei ist eine Klemmlänge von der zweiten Klemmstelle zur dritten Klemmstelle entlang einer Oberfläche der Ausgangsoberwalze geringer als eine mittlere Stapellänge des zu verstreckenden Faserverbandes.Proposed is a drafting system for a spinning machine for drawing a fiber structure, with at least a first pair of rollers consisting of an upper roller and a lower roller, and with a second pair of rollers consisting of an output upper roller and an output lower roller, and with a fiber compression downstream of the output roller pair for compressing the drawn fiber structure . The fiber compaction has a pneumatic compaction device with a fiber bundling zone and with a suction tube that is wrapped around by a screen element and that can be sucked out. A first nip point is defined by the first pair of rollers and a second nip point by the second pair of rollers, and the first nip point and the second nip point form a drafting field plane through which the fiber strand runs in a running direction from the first nip point to the second nip point. Seen in the direction of travel of the fiber structure, the upper exit roller has a curtain opposite the lower exit roller in the drafting field plane and a third nip is defined by the exit top roller and the screen element. A nip length from the second nip point to the third nip point along a surface of the output top roller is less than an average staple length of the fiber structure to be drawn.
Anschließend an das Ausgangswalzenpaar ist ein Saugrohr angeordnet. Welches zumindest teilweise von einem Siebelement umschlungen wird. Zwischen der zweiten und der dritten Klemmstelle, eingeschlossen vom Siebelement und den die zweite Klemmstelle bildenden Elementen, befindet sich eine Faserbündelungszone. In dieser Faserbündelungszone wird der die zweite Klemmstelle verlassende verstreckte Faserverband gebündelt. Der aus dem Ausgangswalzenpaar austretende Faserverband trifft kurz vor dem Erreichen der dritten Klemmstelle auf das Siebelement und wird auf diesem zur dritten Klemmstelle geführt. Auf diesem Weg wird der Faserverband durch den Einfluss eines Luftstromes gebündelt. Das Siebelement umläuft das Saugrohr, welches im Bereich zwischen der zweiten und der dritten Klemmstelle eine Saugöffnung aufweist. Die durch die Saugöffnung angesaugte Umgebungsluft führt dazu, dass einzelne vom Faserverband abstehende Fasern zur Saugöffnung bewegt werden 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 Faserverband herangeführt ohne dass der Faserverband aus seiner Laufrichtung ausgelenkt wird. In einem derartigen Verfahren einer Faserbündelung werden die Faserenden durch eine pneumatische Saugströmung zum Faserverband geführt und in der dritten Klemmstelle an den Faserverband angelegt. Das Saugrohr und damit das Siebelement werden vorteilhafterweise möglichst nahe an die zweite Klemmstelle herangeführt.A suction pipe is arranged after the pair of output rollers. Which is at least partially wrapped by a screen element. A fiber bundling zone is located between the second and the third nip, enclosed by the screening element and the elements forming the second nip. In this fiber bundling zone, the drawn fiber structure leaving the second clamping point is bundled. The fiber bundle emerging from the pair of output rollers hits the screen element shortly before reaching the third nip point and is guided on it to the third nip point. In this way, the fiber structure is bundled by the influence of an air current. The sieve element runs around the suction pipe, which has a suction opening in the area between the second and the third clamping point. The ambient air sucked in through the suction opening means that individual fibers protruding from the fiber structure are moved to the suction opening and the fiber structure is thus bundled. Compared to conventional pneumatic compaction, in which the fiber structure is moved on a screen element transversely to its direction of travel and the fibers are thus pushed together, with fiber bundling only fiber parts or fiber ends protruding from the fiber structure are brought up to the fiber structure without the fiber structure being deflected from its direction of travel . In such a fiber bundling method, the fiber ends are guided to the fiber structure by a pneumatic suction flow and applied to the fiber structure in the third clamping point. The suction tube and thus the screen element are advantageously brought as close as possible to the second clamping point.
Zwischen der zweiten Klemmstelle und der dritten Klemmstelle wird entlang einer Oberfläche der Ausgangsoberwalze eine Klemmlänge ausgebildet, welche kleiner als eine mittlere Faserstapellänge des zu verdichtenden Faserverbandes ist. Dadurch werden die meisten im Faserverband enthaltenen Fasern immer entweder in der zweiten Klemmstelle oder in der dritten Klemmstelle gehalten. Der Faserverband 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 Faserverband selbst nicht direkt durch das Siebelement transportiert, sondern durch die Klemmstellen gehalten die Faserbündelungszone durchläuft. Dadurch wird die sogenannte Haarigkeit des Faserverbandes beseitigt und die Haare in den Faserverband eingebunden. Ebenfalls wird durch die ständige Klemmung zumindest eines Faserendes verhindert, dass der Faserverband die im Streckwerk aufgebrachte Streckung während des Durchlaufens der Faserbündelungszone wieder verliert oder teilweise verlieren kann.Between the second nip point and the third nip point, a nip length is formed along a surface of the output top roller, which is smaller than an average fiber staple length of the fiber strand to be compressed. As a result, most of the fibers contained in the fiber structure are always held either in the second clamping point or in the third clamping point. The fiber bundle is transported in a defined manner from the second to the third clamping point. In the fiber bundling zone, only the fiber parts protruding from the fiber structure are brought into the fiber strand. The air flow ensures that fiber parts or fiber ends protruding from the fiber structure are guided to the fiber structure, with the fiber structure itself not being transported directly through the screen element, but instead passing through the fiber bundling zone held by the clamping points. This eliminates the so-called hairiness of the fiber structure and binds the hair into the fiber structure. The constant clamping of at least one fiber end also prevents the fiber structure from losing or partially losing the stretching applied in the drafting system while passing through the fiber bundling zone.
Durch die dritte Klemmstelle wird zudem das Siebelement durch die Ausgangsoberwalze angetrieben. Durch den Reibantrieb des Siebelementes entsteht ein geringfügiger Schlupf, sodass das Siebelement eine geringere Geschwindigkeit aufweist als das Ausgangswalzenpaar. Auch dieser Umstand trägt dazu bei, dass eine Bündelung des Faserverbandes, respektive eine Einbindung von abstehenden Faserenden in den Faserverband, möglich wird.The screen element is also driven by the output top roller through the third clamping point. The frictional drive of the screen element creates a slight slip, so that the screen element has a lower speed than the output roller pair. This circumstance also contributes to the fact that bundling of the fiber assembly, or integration of protruding fiber ends in the fiber assembly, becomes possible.
Vorteilhafterweise beträgt der Vorhang der Ausgangsoberwalze gegenüber der Ausgangsunterwalze, gemessen in der Streckfeldebene, 2 mm bis 15 mm, besonders bevorzugt 5 mm bis 12 mm. Der Vorhang der Ausgangsoberwalze gegenüber der Ausgangsunterwalze ermöglicht eine Anordnung der dritten Klemmstelle nahe der zweiten Klemmstelle.Advantageously, the curtain of the upper exit roller compared to the lower exit roller, measured in the drafting zone, is 2 mm to 15 mm, particularly preferably 5 mm to 12 mm. The curtain of the upper exit roller opposite the lower exit roller enables the third nip to be located close to the second nip.
Weiter ist es von Vorteil, wenn ein Verhältnis des Durchmessers der Ausgangsoberwalze zum Durchmesser der Ausgangsunterwalze 1,4 bis 2,5 beträgt. Durch die Vergrößerung der Ausgangsoberwalze gegenüber der Ausgangsunterwalze wird eine Verbesserung der räumlichen Anordnung der Faserbündelungszone erreicht. Bevorzugterweise weist die Ausgangsoberwalze einen Durchmesser von 34 mm bis 60 mm und die Ausgangsunterwalze einen Durchmesser von 24 mm bis 36 mm auf. Die gewählten Durchmesser der Walzen führen zur Schaffung einer nicht zu großen Faserbündelungszone und vermeiden eine zu hohe Abweichung des weiteren Verlaufes des Faserverbandes nach der Verdichtungsvorrichtung zu einer Spinnvorrichtung nach einem Anbau der Verdichtungsvorrichtung an bestehende Spinnmaschinen. Ein weiterführender Umbau der Spinnmaschine, beispielsweise durch Veränderung der Anordnung der Streckfeldebene, zur Aufrechterhaltung der vor einem Anbau der Verdichtungsvorrichtung herrschenden Verfahrensbedingungen ist dadurch nicht notwendig.It is also advantageous if the ratio of the diameter of the top roller to the diameter of the bottom roller is 1.4 to 2.5. The enlargement of the upper exit roller compared to the lower exit roller improves the spatial arrangement of the fiber bundling zone. The upper exit roller preferably has a diameter of 34 mm to 60 mm and the lower exit roller has a diameter of 24 mm to 36 mm. The selected diameters of the rollers lead to the creation of a fiber bundling zone that is not too large and avoid excessive deviations in the further course of the fiber structure after the compression device to a spinning device after the compression device has been attached to existing spinning machines. A further conversion of the spinning machine, for example by changing the arrangement of the drafting field level, to maintain the process conditions prevailing before the compaction device was attached is therefore not necessary.
Bevorzugterweise beträgt die Klemmlänge von der zweiten Klemmstelle zur dritten Klemmstelle entlang einer Oberfläche der Ausgangsoberwalze 12 mm bis 20 mm. Die abstehenden Faserteile werden derart zum Faserverband gebündelt, dass diese beim nachfolgenden Spinnprozess sicher eingebunden werden. Dadurch werden gegenüber einem unverdichteten Faserverband weitere Faserteile zur Substanzausnutzung im Garn herangezogen. Gegenüber herkömmlichen pneumatischen Verdichtungsverfahren, bei welchem Fasern in ihrer ganzen Länge über ein Siebelement bewegt werden, ergibt sich durch die kurze Klemmlänge der Vorteil, dass nur die freien Faserenden bewegt werden und damit die Faserbündelungskräfte lediglich die Steifheit der einzelnen Fasern überwinden müssen.The nip length from the second nip point to the third nip point along a surface of the output top roller is preferably 12 mm to 20 mm. The protruding fiber parts are bundled into a fiber structure in such a way that they are securely integrated in the subsequent spinning process. As a result, other fiber parts are used for substance utilization in the yarn compared to an uncompacted fiber structure. Compared to conventional pneumatic compression methods, in which fibers are moved over their entire length over a screen element, the short clamping length has the advantage that only the free fiber ends are moved and the fiber bundling forces only have to overcome the stiffness of the individual fibers.
Vorteilhafterweise wird das Siebelement nach der dritten Klemmstelle derart umgelenkt, dass ein Ablösepunkt auf einer Oberfläche des Siebelements an welchem sich der verdichtete Faserverband vom Siebelement löst, weniger als 10 mm, bevorzugterweise weniger als 5 mm von der dritten Klemmstelle entfernt ist. Ebenfalls vorteilhaft ist es, wenn der Ablösepunkt in radialer Richtung der Ausgangsoberwalze der dritten Klemmstelle weniger als 4 mm von einer Oberfläche der Ausgangsoberwalze entfernt ist. Eine möglichst kurze Führung des Faserverbandes durch das Siebelement nach der dritten Klemmstelle ergibt weitere Vorteile für die geometrische Anordnung der nachfolgenden Spinnvorrichtung. Auch kann dadurch die Gefahr einer seitlichen Verschiebung des Faserverbandes auf dem Siebelement und damit eine Schädigung des zuvor gebündelten Faserverbandes minimiert werden.The screen element is advantageously deflected after the third clamping point in such a way that a detachment point on a surface of the screen element at which the compacted fiber strand detaches from the screen element is less than 10 mm, preferably less than 5 mm, away from the third clamping point. It is also advantageous if the detachment point in the radial direction of the output top roller of the third nip is less than 4 mm away from a surface of the output top roller. The shortest possible guidance of the fiber structure through the sieve element after the third clamping point results in further advantages for the geometric arrangement of the subsequent spinning device. This also minimizes the risk of the fiber structure shifting laterally on the sieve element and thus damage to the previously bundled fiber structure.
Bevorzugterweise weist die Ausgangsoberwalze eine geringere axiale Länge als die Ausgangsunterwalze auf. Daraus ergibt sich der Vorteil, dass eine Verkantung der Achsen der Ausgangsoberwalze und der Ausgangsunterwalze weitestgehend vermieden wird. Es ergibt sich auch bei zunehmender Abnutzung der Beläge der Ausgangswalzen eine gute Laufsicherheit und Aufrechterhaltung der zweiten und dritten Klemmstelle.The upper exit roller preferably has a shorter axial length than the lower exit roller. This results in the advantage that tilting of the axes of the upper output roller and the lower output roller is largely avoided. Even with increasing wear of the linings of the output rollers, good running reliability and maintenance of the second and third nip point is achieved.
Vorteilhafterweise ist die Verdichtungsvorrichtung an einem Maschinengestell der Spinnereimaschine oder am Streckwerk angeordnet. Bei einer Anordnung der Verdichtungsvorrichtung am Streckwerk ist die Befestigung bevorzugterweise an einem Druckarm des Streckwerks angeordnet. Beim Abheben des Druckarmes, welcher üblicherweise auch die Oberwalzen der Streckwerkswalzenpaare trägt, wird nicht nur das gesamte Streckwerk geöffnet, sondern auch die Verdichtungsvorrichtung angehoben. Dies hat für die Wartung der Streckwerke Vorteile.The compression device is advantageously arranged on a machine frame of the spinning machine or on the drafting system. When the compression device is arranged on the drafting system, the attachment is preferably arranged on a pressure arm of the drafting system. When lifting the pressure arm, which usually also carries the top rollers of the pairs of drafting rollers, not only is the entire drafting system opened, but the compacting device is also raised. This has advantages for the maintenance of the drafting systems.
Weiter wird eine Ringspinnmaschine vorgeschlagen mit zumindest einem Streckwerk zur Verdichtung eines Faserverbandes in einer Spinnmaschine nach der obigen Beschreibung.Furthermore, a ring spinning machine is proposed with at least one drafting system for compressing a fiber structure in a spinning machine according to the above description.
Weitere Vorteile der Erfindung sind im nachfolgenden Ausführungsbeispiel beschrieben. Es zeigen
Figur 1- eine schematische Darstellung eines Längsschnittes einer Spinnmaschine nach dem Stand der Technik und
Figur 2- eine schematische Darstellung eines Längsschnittes einer erfindungsgemäßen Ausführungsform der Verdichtungsvorrichtung des Streckwerks.
- figure 1
- a schematic representation of a longitudinal section of a spinning machine according to the prior art and
- figure 2
- a schematic representation of a longitudinal section of an embodiment according to the invention of the compression device of the drafting system.
Nachfolgend an das Ausgangswalzenpaar 5 ist ein Saugrohr 19 angeordnet. Das Saugrohr 19 wird von einem Siebelement 21 umschlungen, welches als Endlos-Band ausgeführt ist und über eine Umlenkung 22 geführt ist. Im gezeigten Ausführungsbeispiel bildet das Siebelement 21 mit der Ausgangsoberwalze 6 eine dritte Klemmstelle K3 für den verstreckten Faserverband. Die Form des Saugrohres 19 ist als ein Polygon dargestellt, es sind jedoch auch beliebig andere Formen wie Dreieck, Ellipsen, etc. möglich.Following the
Zwischen der zweiten Klemmstelle K2 und der dritten Klemmstelle K3 durchläuft der verstreckte Faserverband die Faserbündelungszone 18. Die Faserbündelungszone 18 bezeichnet den Raum, welcher durch die Ausgangsoberwalze 6, die Ausgangsunterwalze 7 und das Saugrohr 19 umschlossen wird. Dabei wird von der zweiten Klemmstelle K2 zur dritten Klemmstelle K3 entlang einer Oberfläche der Ausgangsoberwalze 6 eine Klemmlänge B ausgebildet, welche geringer ist als eine mittlere Stapellänge des zu verstreckenden Faserverbandes 1. Das Saugrohr 19 weist in dieser Faserbündelungszone 18 eine Saugöffnung 20 auf. Die Saugöffnung 20 ist vorzugsweise als schlitzförmiger Durchbruch in der Wandung des Saugrohres 19 ausgeformt. Das Saugrohr 19 ist an eine Unterdruckquelle (nicht gezeigt) angeschlossen, dies bewirkt, dass über die Saugöffnung 20 und damit auch durch das über die Saugöffnung 20 gleitende Siebelement 21 Luft aus der Faserbündelungszone 18 angesaugt wird. Durch die entstehende Luftströmung wird der verstreckte Faserverband an das Siebelement 21 herangezogen, wobei einzelne vom verstreckten Faserverband abstehende Fasern oder Faserteile zur Saugöffnung 20 gefördert und damit an den verstreckten Faserverband angeschmiegt werden. Während dieses Anschmiegevorganges werden die einzelnen 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.Between the second nip point K2 and the third nip point K3, the drawn fiber strand passes through the
Das Siebelement 21 wird von der Ausgangsoberwalze 6 über die entstehende Reibkraft in der dritten Klemmstelle K3 in Bewegung versetzt, wodurch der verstreckte Faserverband aus der Faserbündelungszone 18 der dritten Klemmstelle K3 zugeführt wird. Der verdichtete Faserverband 23 verlässt anschließend das Siebelement 21 an einem Ablösepunkt 26, welcher nicht der dritten Klemmstelle K3 entspricht. Der verdichtete Faserverband 23 wird vom Ablösepunkt 26 an die Spinnvorrichtung 10 respektive den der Spinnvorrichtung 10 vorgelagerten Fadenführer 9 der Spinnmaschine übergeben (siehe
Eine Länge C welche der verdichtete Faserverband vom dritten Klemmpunkt K3 bis zum Ablösepunkt 26 auf dem Siebelement 21 zurücklegt, ist kleiner als 10 mm. Dadurch wird eine Faserschädigung vermieden und der Faserverband bleibt durch die Vermeidung eines Weitertransports auf dem Siebelement 21 in seiner gebündelten Form erhalten.A length C, which the compressed fiber structure covers from the third clamping point K3 to the
- 11
- Faserverbandfiber bandage
- 22
- Streckwerkdrafting system
- 33
- Eingangswalzenpaarpair of input rollers
- 44
- Riemchenwalzenpaarpair of apron rollers
- 55
- Ausgangswalzenpaaroutput roller pair
- 66
- Ausgangsoberwalzeoutput top roller
- 77
- Ausgangsunterwalzeexit bottom roller
- 88th
- Verstreckter FaserverbandStretched fiber structure
- 99
- Fadenführerthread guide
- 1010
- Spinnvorrichtungspinning device
- 1111
- Läuferrunner
- 1212
- Ringring
- 1313
- SpuleKitchen sink
- 1414
- Ringbankring bank
- 1515
- Spindelbankspindle bank
- 1616
- Oberwalzetop roller
- 1717
- Unterwalzebottom roller
- 1818
- Faserbündelungszonefiber bundling zone
- 1919
- Saugrohrintake manifold
- 2020
- Saugöffnungsuction port
- 2121
- Siebelementscreen element
- 2222
- Umlenkungdeflection
- 2323
- Verdichteter FaserverbandCompressed fiber structure
- 2424
- Streckfeldebenestretching plane
- 2525
- Laufrichtungrunning direction
- 2626
- Ablösepunktdetachment point
- AA
- Vorhang AusgangsoberwalzeCurtain exit top roller
- BB
- Klemmlängeclamping length
- CC
- Längelength
- DD
- Durchmesser AusgangsoberwalzeDiameter of exit top roller
- EE
- Durchmesser AusgangsunterwalzeOutput bottom roll diameter
- K1K1
- Erster KlemmpunktFirst pinch point
- K2K2
- Zweiter KlemmpunktSecond pinch point
- K3K3
- Dritter KlemmpunktThird pinch point
Claims (10)
- A drafting system for a spinning machine for drafting a fiber strand (1), having at least one first roller pair (4) made of a top roller (16) and a bottom roller (17), and having a second roller pair (5) made of a top output roller (6) and a bottom output roller (7), and having a fiber condensing device for condensing the drafted fiber strand and disposed downstream of the output roller pair (5) and comprising a pneumatic condensing device having a fiber bundling zone (18) and having a suctionable suction tube (19) enlaced by a lattice element (21), a first clamping point (K1) being defined by the first roller pair (4) and a second clamping point (K2) being defined by the second roller pair (5), and the first clamping point (K1) and the second clamping point (K2) implementing a drafting zone plane (24) transited by the fiber strand (1) in a running direction (25) from the first clamping point (K1) to the second clamping point (K2) and a third clamping point (K3) is defined by the top output roller (6) and the lattice element (21), characterized in that the top output roller (6) comprises an offset (A) in the drafting zone plane (24) relative to the bottom output roller (7) as seen in the running direction (25) of the fiber strand (1), and wherein a clamping length (B) from the second clamping point (K2) to the third clamping point (K3) along a surface of the top output roller (6) is less than an average staple length of the fiber strand (1) to be drafted at the drafting system.
- The drafting system according to claim 1, characterized in that the offset (A) is 2 mm to 15 mm as measured in the drafting zone plane (24).
- The drafting system according to claim 1 or 2, characterized in that the offset (A) is 5 mm to 12 mm.
- The drafting system according to any one or more of the preceding claims, characterized in that a ratio of the diameter (D) of the top output roller (6) to the diameter (E) of the bottom output roller (7) is between 1.4 and 2.5.
- The drafting system according to any one or more of the preceding claims, characterized in that the top output roller (6) has a diameter (D) of 34 mm to 60 mm and the bottom output roller (7) has a diameter (E) of 24 mm to 36 mm.
- The drafting system according to any one or more of the preceding claims, characterized in that wherein a clamping length (B) from the second clamping point (K2) to the third clamping point (K3) along a surface of the top output roller (6) is 12 mm to 20 mm.
- The drafting system according to any one or more of the preceding claims, characterized in that the lattice element (21) is deflected after the third clamping point (K3), such that a length (C) on the lattice element (21) between the third clamping point (K3) and a release point (26) on a surface of the lattice element (21) at which the condensed fiber strand (26) releases from the lattice element (21) is less than 10 mm, preferably less than 5 mm.
- The drafting system according to any one or more of the preceding claims, characterized in that the top output roller (6) has a lesser axial length than the bottom output roller (7).
- The drafting system according to any one or more of the preceding claims, characterized in that the condensing device is disposed on a machine frame of the spinning machine or on the drafting system.
- A ring spinning machine characterized in that at least one drafting system according to any one of the claims 1 through 9 is provided.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01528/17A CH714445A1 (en) | 2017-12-15 | 2017-12-15 | Drafting system for a spinning machine with a compacting device. |
PCT/EP2018/083313 WO2019115265A1 (en) | 2017-12-15 | 2018-12-03 | Drawing frame for a spinning machine comprising a compaction device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3724383A1 EP3724383A1 (en) | 2020-10-21 |
EP3724383B1 true EP3724383B1 (en) | 2023-01-25 |
Family
ID=64606980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18814847.2A Active EP3724383B1 (en) | 2017-12-15 | 2018-12-03 | Drawing frame for a spinning machine comprising a compaction device |
Country Status (4)
Country | Link |
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EP (1) | EP3724383B1 (en) |
CN (1) | CN111465728B (en) |
CH (1) | CH714445A1 (en) |
WO (1) | WO2019115265A1 (en) |
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DE102021126795A1 (en) | 2021-10-15 | 2023-04-20 | Maschinenfabrik Rieter Ag | Device for compacting a fiber structure |
Family Cites Families (17)
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US4976096A (en) * | 1989-06-15 | 1990-12-11 | The United States Of America As Represented By The Secretary Of Agriculture | System for producing core/wrap yarn |
AU6917998A (en) * | 1997-03-03 | 1998-09-22 | Csm-Sachsische Spinnereimaschinen Gmbh | Drawing mechanism for spinning frames with a fibre bunching zone and ring-spinning frame equipped therewith |
DE19922861A1 (en) * | 1999-05-19 | 2000-11-23 | Stahlecker Fritz | System to condense a drawn sliver maintains a clamping action on a significant portion of the sliver fibers at the end of the drawing unit during the condensing action to prevent clogging the transport belt |
DE19955525A1 (en) * | 1999-11-18 | 2001-05-23 | Fritz Stahlecker | Sliver compaction arrangement for spinning machine drafting system includes pressurized air supply to blow outwards through perforated apron |
JP2001279539A (en) * | 2000-03-08 | 2001-10-10 | Zinser Textilmas Gmbh | Draft system in fine spinning frame |
DE10019436A1 (en) * | 2000-04-19 | 2001-10-25 | Zinser Textilmaschinen Gmbh | Sliver drawing unit has a condensing action between two defined sliver clamping points with a lateral reciprocating movement across the sliver travel line to reduce wear for a consistent spun yarn quality |
DE10218843A1 (en) * | 2002-04-23 | 2003-11-06 | Stahlecker Gmbh Wilhelm | Spinning machine yarn compacting assembly drafting rollers discharge with air-permeable transport belt through first shallow curve to second sharp curve |
CN1320183C (en) * | 2003-06-25 | 2007-06-06 | 东台纺织机械有限责任公司 | Fiber collecting device for ring spinning frame |
CH697457B1 (en) * | 2004-07-14 | 2008-10-31 | Holding Fuer Industriebeteiligungen Ag | Pressure roller unit. |
BRPI0404427A (en) * | 2004-10-19 | 2006-06-06 | Lakshmi Machine Works Ltd | apparatus for condensation of a suctioned fiber fragment |
CN100503914C (en) * | 2006-06-09 | 2009-06-24 | 宁波韵升股份有限公司 | Spinning machine with collecting device |
DE102007006282A1 (en) * | 2007-02-01 | 2008-08-07 | Wilhelm Stahlecker Gmbh | Drawframe with compression zone |
CN201670914U (en) * | 2010-05-21 | 2010-12-15 | 常州市同和纺织机械制造有限公司 | Negative pressure collecting pipe of pneumatic yarn collecting device |
CN201793835U (en) * | 2010-08-17 | 2011-04-13 | 日照裕鑫动力有限公司 | Mechanical tight spinning drafting mechanism |
CN102517702A (en) * | 2011-12-15 | 2012-06-27 | 江南大学 | Method for improving airflow stability for mesh roller type compact spinning |
DE102012013574A1 (en) * | 2012-07-06 | 2014-05-22 | Saurer Germany Gmbh & Co. Kg | Drafting system for a spinning machine |
CN103820892B (en) * | 2014-03-05 | 2017-01-11 | 浙江理工大学 | Mechanical compact spinning fiber gathering device |
-
2017
- 2017-12-15 CH CH01528/17A patent/CH714445A1/en not_active Application Discontinuation
-
2018
- 2018-12-03 WO PCT/EP2018/083313 patent/WO2019115265A1/en unknown
- 2018-12-03 CN CN201880080251.1A patent/CN111465728B/en active Active
- 2018-12-03 EP EP18814847.2A patent/EP3724383B1/en active Active
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CN111465728A (en) | 2020-07-28 |
CN111465728B (en) | 2022-08-19 |
WO2019115265A1 (en) | 2019-06-20 |
EP3724383A1 (en) | 2020-10-21 |
CH714445A1 (en) | 2019-06-28 |
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