EP0268550A1 - Thread tension device for a textile machine - Google Patents

Thread tension device for a textile machine Download PDF

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Publication number
EP0268550A1
EP0268550A1 EP87810518A EP87810518A EP0268550A1 EP 0268550 A1 EP0268550 A1 EP 0268550A1 EP 87810518 A EP87810518 A EP 87810518A EP 87810518 A EP87810518 A EP 87810518A EP 0268550 A1 EP0268550 A1 EP 0268550A1
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EP
European Patent Office
Prior art keywords
thread
lamella
yarn
deflection element
air
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
EP87810518A
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German (de)
French (fr)
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EP0268550B1 (en
Inventor
Anton Egloff
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.)
Sulzer AG
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Sulzer AG
Gebrueder Sulzer AG
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Publication of EP0268550A1 publication Critical patent/EP0268550A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • B65H59/28—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged towards each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/10—Actuating means linear
    • B65H2555/11—Actuating means linear pneumatic, e.g. inflatable elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a device for tensioning a thread presented to a textile machine, wherein a deflection element which is effective transversely to the thread path is provided.
  • Such a device is used for example on weaving machines in which the weft thread is inserted into the shed by means of a gripper. To tension the thread, it is deflected from its normal running direction, for example by a spring-loaded lever, before it is guided by a deflection element in a direction outside the effective range of the lever.
  • a deflection element in a direction outside the effective range of the lever.
  • CH-PS No. 182 692, Fig. 17 Such an arrangement is known from CH-PS No. 182 692, Fig. 17.
  • the movement of the lever can partially compensate for fluctuations in consumption of the thread entering the textile machine.
  • the repeated deflection of the thread in the area of the tensioning device also results in a braking effect, as a result of which the thread can only be drawn off after the tensioning device in the downward direction while overcoming a certain braking force.
  • Tensioning devices of the type described are used in numerous embodiments on various textile machines.
  • the known devices have the disadvantage that the thread is strongly deflected in the tensioning device, whereby the frictional stress on the thread can possibly become too great.
  • a certain system inertia for example due to the lever mass, the mass of a spring element, the bearing friction in the lever bearing, must also be overcome, so that strong fluctuations in tension can occur in the event of very short consumption fluctuations of the thread.
  • the thread can either be stretched too much for a short time, or it falls below a predetermined minimum tension if the tensioning device does not respond quickly enough in the deflection direction. In both cases, this can lead to malfunctions in the textile machine.
  • the weft thread When weaving weft yarn in rapier weaving machines, the weft thread is subject to strong fluctuations in consumption during entry due to the discontinuous movement sequences.
  • the weft thread is drawn in, for example, by a rapier gripper into the middle of the shed and handed over to a slave rapier there.
  • a slave gripper is described in U.S. Patent No. 4,062,382.
  • the weft thread When the weft thread is transferred from the donor gripper into the hook of the above mentioned gripper gripper, the weft thread first slides over the outer edge of the hook before it can slide into the mouth of the hook via the hook tip. After the weft thread has slid into the hook mouth, the thread is slightly relaxed before it is firmly gripped by the hook.
  • this object is achieved in that the deflection element is of low mass and can be acted upon by a force field which is effective in the deflection direction.
  • the force field can be built up by compressed air flowing against the deflection element on one side, the space between the outlet opening of the air and the lamella being advantageously shielded as completely as possible so that the compressed air losses remain small.
  • the force field can also be generated by electromagnetic or electrostatic means.
  • the deflection element is formed, for example, by a curved lamella fastened on one side to a base plate, which is guided through plates on its narrow sides and which can come into contact with the weft thread on the convex part of its long side.
  • the weft thread is advantageously guided through eyelets in front of and behind the slat, so that the thread deflection is limited due to the position of the slat on the thread area between the eyelets.
  • the selected arrangement ensures that the thread tensioner reacts very quickly to changes during the thread run.
  • the weft thread 2 runs from the weft thread store 1 in the direction of the arrow 2 ⁇ into the thread tensioner 3 and from there through the eyelet of the weft thread selector 4 to the rapier gripper 5.
  • a rapier gripper is described in US Pat. No. 4,071,055. Its function is therefore not explained further here.
  • the rapier gripper 5 takes over the weft thread 2 by moving it along the stop line 13 into the shed 11 formed by the warp threads 7 and 8. Before the carrier gripper 5 enters the shed 11, the weft thread 2 is cut by the scissors 9.
  • the rapier gripper pulls the weft thread into the shed 11 according to arrow 52 up to the position 5 ⁇ , where the slave gripper 6 in the position 6 ⁇ takes over the weft thread tip 21 from the rapier gripper 5 and is retracted according to the directional arrow 62 until it emerges from the shed 11 with the scissors 10 .
  • the weft thread tip 21 is released and clamped by the edge warp threads 71.
  • the weft thread should be kept under as constant a tension as possible, so that no transfer errors occur from the weft thread selector 4 to the gripper 5, from the gripper 5 to the gripper 6.
  • the tension in the weft thread should also be constant after the release by the slave gripper 6 until it strikes the stop line 13, which is necessary to achieve a uniform fabric image. As indicated at the beginning, strong fluctuations in the weft thread speed occur during the weft insertion. When transferring the weft thread from the hook to the The pick thread comes to a standstill, the weft even has to be pulled back a little.
  • the thread tensioner 3 is used to keep the thread tension constant and to retract the weft thread 2 slightly, the structure of which can be seen in detail in FIG. 2.
  • the thread tensioner 3 consists essentially of a plate 36 fastened on the base plate 31 by means of the screw 39 and guided laterally between side plates 32 and 33.
  • the lamella Under the action of the air flowing out of the bore 36 according to arrow 37, the lamella is pressed against the weft thread 2, which runs through the eyelets 341 and 351 in the end plates 34 and 35.
  • the degree of weft deflection within the thread tensioner and thus its tension during the entry can be achieved by regulating the air supplied.
  • the free end of the lamella 36 moves essentially within the trough 30.
  • the shape of the lamella 36, the position of the trough 30 and the side plates 32 and 33 make the air flowing out of the bore 37 flow freely between the plates 32 and 33 hindered, which results in a reasonably low air consumption.
  • the inside of the thread tensioner is kept free of deposits by the outflowing air.
  • the air required in the thread tensioner 3 can be used, for example, as exhaust air from the suction device 40 on the catching side 16.
  • the air acts directly on the weft thread without a deflection element, the weft thread is only minimally stressed by the air currents.
  • the lamella 36 is from above by the weft thread and gravity due to its own mass as well as kept below in balance by the force field of the air flowing against them.
  • the slat is designed with as little mass as possible so that it can react quickly to changes in the weft thread.
  • a force field can also be applied to the lamella in another way, for example by an electromagnetic field.
  • a permanent magnet or electromagnet is arranged above a lamella made of magnetizable material.
  • the lamella 36 is advantageously produced from plastic, for example from carbon fiber-reinforced synthetic resin.
  • the lamella 36 is pressed, for example, into the dashed position 362, the lamella having its back against a bolt 70 fastened transversely in the side plates 32, 33 and the weft thread 2, in FIG. 2 is drawn in the dash-dotted position 22, is clamped between the lamella 362 and the bolt 70, so that no weft thread can be retightened from the right.
  • the lamella 36 is designed to be flexible, it is curved by the bolt 70, as a result of which the weft thread 2 is retracted further in the area to the left of the bolt 70 in FIG. 2, without 1 thread being able to be drawn from the weft thread store.
  • the interaction of the lamella 36 with the bolt 70 makes it possible to work with a particularly low weft thread tension.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Abstract

A device for tensioning a yarn fed to a textile machine possesses a yarn-deflecting element (36) which acts transversely to the yarn run and by means of which as constant a yarn tension of the yarn (2) as possible should be achieved in the textile machine in spite of pronounced consumption fluctuations. The deflecting element used is a low-mass lamella (36) which can be deflected by a force field effective transversely to the direction of run of the yarn. The force field can be applied by an air jet or, for example, electromagnetic or electrostatic means. The arrangement guarantees a very rapid reaction of the yarn tension device to variations during the yarn run, with the result that the tension fluctuations in the yarn behind the yarn tension device remain only slight. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zum Spannen eines einer Textilmaschine vorgelegten Fadens, wobei ein quer zum Fadenlauf wirksames Auslenkelement vorgesehen ist.The invention relates to a device for tensioning a thread presented to a textile machine, wherein a deflection element which is effective transversely to the thread path is provided.

Eine derartige Vorrichtung wird beispielsweise an Webmaschinen verwendet, bei welchen der Schussfaden mittels eines Greifers in das Webfach eingetragen wird. Zum Spannen des Fadens wird dieser beispielsweise durch einen federbelasteten Hebel aus seiner normalen Laufrichtung abgelenkt, bevor er durch ein Umlenkelement in eine Richtung ausserhalb des Wirkungsbereichs des Hebels geleitet wird. Eine solche Anordnung ist aus der CH-PS Nr. 182 692, Fig. 17, bekannt. Durch die Bewegung des Hebels können Verbrauchsschwankungen des in die Textilmaschine einlaufenden Fadens teilweise ausgeglichen werden. Durch die mehrmalige Umlenkung des Fadens im Bereich der Spannvorrichtung wird auch ein Bremseffekt erzielt, wodurch der Faden in Ablaufrichtung nach der Spannvorrichtung nur unter Ueberwindung einer gewissen Bremskraft abgezogen werden kann. Spannvorrichtungen nach der beschriebenen Art werden in zahlreichen Ausführungsformen an verschiedenen Textilmaschinen verwendet. Die bekannten Vorrichtungen haben den Nachteil, dass der Faden in der Spannvorrichtung stark umgelenkt wird, wodurch die Reibungsbeanspruchung des Fadens unter Umständen zu gross werden kann. Bei den bekannten mechanischen Spannvorrichtungen muss auch eine gewisse Systemträgheit beispielsweise aufgrund der Hebelmasse, der Masse eines Federelementes, der Lagerreibung im Hebellager überwunden werden, so dass bei sehr kurzzeitigen Verbrauchsschwankungen des Fadens starke Spannungsschwankungen auftreten können. Dabei kann der Faden entweder kurzzeitig zu stark gedehnt werden, oder er unterschreitet eine vorgegebene Mindestspannung, wenn die Spannvorrichtung nicht rasch genug in Auslenkrichtung anspricht. In beiden Fällen kann dies zu Betriebsstörungen in der Textilmaschine führen. Beim Verweben von Schussgarn in Greiferwebmaschinen unterliegt der Schussfaden während des Eintrags aufgrund der diskontinuierlichen Bewegungsabläufe starken Verbrauchsschwankungen. Der Schussfaden wird beispielsweise durch einen Bringergreifer bis in die Mitte des Webfaches eingezogen und dort einem Nehmergreifer übergeben. Ein derartiger Nehmergreifer ist im US-Patent Nr. 4 062 382 beschrieben. Bei der Uebergabe des Schussfadens vom Gebergreifer in den Haken des erwähnten Nehmergreifers streift der Schussfaden zunächst über die Aussenkante des Hakens, bevor er über die Hakenspitze in das Maul des Hakens hineingleiten kann. Nach dem Hereingleiten des Schussfadens in das Hakenmaul wird der Faden geringfügig entspannt, bevor er durch den Haken fest ergriffen wird. Die Entspannung des Fadens muss durch die eingangs erwähnte Spannvorrichtung möglichst vollständig ausgeglichen werden, da der Schussfaden nur unter einer gewissen Mindestspannung vom Nehmergreifer sicher erfasst werden kann. Aehnliche kritische Phasen während des Schusseintrages treten bei der Uebernahme des Schussfadens durch den Gebergreifer auf der Eintragsseite der Webmaschine und nach der Abgabe des Schussfadens vom Nehmergreifer auf der Fangseite der Webmaschine auf.Such a device is used for example on weaving machines in which the weft thread is inserted into the shed by means of a gripper. To tension the thread, it is deflected from its normal running direction, for example by a spring-loaded lever, before it is guided by a deflection element in a direction outside the effective range of the lever. Such an arrangement is known from CH-PS No. 182 692, Fig. 17. The movement of the lever can partially compensate for fluctuations in consumption of the thread entering the textile machine. The repeated deflection of the thread in the area of the tensioning device also results in a braking effect, as a result of which the thread can only be drawn off after the tensioning device in the downward direction while overcoming a certain braking force. Tensioning devices of the type described are used in numerous embodiments on various textile machines. The known devices have the disadvantage that the thread is strongly deflected in the tensioning device, whereby the frictional stress on the thread can possibly become too great. In the known mechanical tensioning devices, a certain system inertia, for example due to the lever mass, the mass of a spring element, the bearing friction in the lever bearing, must also be overcome, so that strong fluctuations in tension can occur in the event of very short consumption fluctuations of the thread. In this case, the thread can either be stretched too much for a short time, or it falls below a predetermined minimum tension if the tensioning device does not respond quickly enough in the deflection direction. In both cases, this can lead to malfunctions in the textile machine. When weaving weft yarn in rapier weaving machines, the weft thread is subject to strong fluctuations in consumption during entry due to the discontinuous movement sequences. The weft thread is drawn in, for example, by a rapier gripper into the middle of the shed and handed over to a slave rapier there. Such a slave gripper is described in U.S. Patent No. 4,062,382. When the weft thread is transferred from the donor gripper into the hook of the above mentioned gripper gripper, the weft thread first slides over the outer edge of the hook before it can slide into the mouth of the hook via the hook tip. After the weft thread has slid into the hook mouth, the thread is slightly relaxed before it is firmly gripped by the hook. The relaxation of the thread must be compensated for as completely as possible by the tensioning device mentioned at the outset, since the weft thread can only be reliably gripped by the slave gripper under a certain minimum tension. Similar critical phases during the weft insertion occur when the weft thread is taken over by the donor gripper on the insertion side of the Loom and after the delivery of the weft thread from the taker on the catch side of the loom.

Es ist Aufgabe der vorliegenden Erfindung, eine Spannvorrichtung zu schaffen, welche sehr kurzfristige Spannungsschwankungen während des Fadenverbrauchs auszugleichen vermag. Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass das Auslenkelement massenarm ausgebildet ist und durch ein in Auslenkrichtung wirksames Kraftfeld beaufschlagbar ist. Das Kraftfeld kann durch einseitig gegen das Auslenkelement strömende Druckluft aufgebaut werden, wobei der Raum zwischen der Austrittsöffnung der Luft und der Lamelle mit Vorteil möglichst vollständig abgeschirmt wird, damit die Druckluftverluste klein bleiben. Das Kraftfeld kann auch durch elektromagnetische bzw. elektrostatische Mittel erzeu gt werden. Das Auslenkelement wird beispielsweise durch eine einseitig an einer Grundplatte befestigte gekrümmte Lamelle gebildet, welche an ihren Schmalseiten durch Platten geführt wird und welche am konvexen Teil ihrer Längsseite mit dem Schussfaden in Berührung treten kann. Vor und hinter der Lamelle wird der Schussfaden mit Vorteil durch Oesen geführt, so dass die Fadenauslenkung aufgrund der Stellung der Lamelle auf dem Fadenbereich zwischen den Oesen beschränkt bleibt. Durch die gewählte Anordnung ist ein sehr rasches Reagieren des Fadenspanners auf Veränderungen während des Fadenablaufs gewährleistet.It is an object of the present invention to provide a tensioning device which is able to compensate for very short-term tension fluctuations during thread consumption. According to the invention, this object is achieved in that the deflection element is of low mass and can be acted upon by a force field which is effective in the deflection direction. The force field can be built up by compressed air flowing against the deflection element on one side, the space between the outlet opening of the air and the lamella being advantageously shielded as completely as possible so that the compressed air losses remain small. The force field can also be generated by electromagnetic or electrostatic means. The deflection element is formed, for example, by a curved lamella fastened on one side to a base plate, which is guided through plates on its narrow sides and which can come into contact with the weft thread on the convex part of its long side. The weft thread is advantageously guided through eyelets in front of and behind the slat, so that the thread deflection is limited due to the position of the slat on the thread area between the eyelets. The selected arrangement ensures that the thread tensioner reacts very quickly to changes during the thread run.

Im folgenden wird die Erfindung anhand der Figuren im einzelnen beschrieben.The invention is described in detail below with reference to the figures.

Es zeigen:

  • Fig. 1 einen schematischen Ueberblick über den Fadenspanner bei der Anwendung an einer Greiferwebmaschine,
  • Fig. 2 einen Längsschnitt durch den Fadenspanner mit dem eingezogenen Schussfaden.
Show it:
  • 1 shows a schematic overview of the thread tensioner when used on a rapier weaving machine,
  • Fig. 2 shows a longitudinal section through the thread tensioner with the weft thread.

Vom Schussfadenspeicher 1 läuft der Schussfaden 2 gemäss Richtungspfeil 2ʹ in den Fadenspanner 3 und von diesem durch die Oese des Schussfadenwählers 4 zum Bringergreifer 5. Ein solcher Bringergreifer ist in der US-Patentschrift 4 071 055 beschrieben. Seine Funktion wird deshalb hier nicht weiter erläutert. Der Bringergreifer 5 übernimmt den Schussfaden 2, indem er längs der Anschlaglinie 13 in das durch die Kettfäden 7 und 8 gebildete Webfach 11 hineinfährt. Vor Eintritt des Bringergreifers 5 in das Webfach 11 wird der Schussfaden 2 durch die Schere 9 geschnitten. Der Bringergreifer zieht den Schussfaden gemäss Pfeil 52 bis zur Stellung 5ʹ in das Webfach 11 ein, wo der Nehmergreifer 6 in der Stellung 6ʹ die Schussfadenspitze 21 vom Bringergreifer 5 übernimmt und gemäss Richtungspfeil 62 bis zum Austritt aus dem Webfach 11 bei der Schere 10 zurückgezogen wird. Nach dem Austritt des Nehmergreifers 6 aus dem Webfach wird die Schussfadenspitze 21 freigegeben und durch die Randkettfäden 71 festgeklemmt. Während des gesamten Ablaufs des Schussfadeneintrags soll der Schussfaden unter einer möglichst konstanten Spannung gehalten werden, damit keine Uebergabefehler vom Schussfadenwähler 4 zum Bringergreifer 5, vom Bringergreifer 5 zum Nehmergreifer 6 auftreten. Die Spannung im Schussfaden soll auch nach der Freigabe durch den Nehmergreifer 6 bis zum Anschlagen an die Anschlaglinie 13 konstant sein, was zur Erzielung eines gleichmässigen Gewebebildes nötig ist. Wie eingangs angedeutet, treten während des Schusseintrages starke Schwankungen der Schussfadengeschwindigkeit auf. Bei der Uebergabe des Schussfadens vom Bringergreifer an den Nehmergreifer kommt der Schussfaden zum Stillstand, wobei der Schussfaden sogar ein wenig zurückgezogen werden muss. Zur Konstanthaltung der Fadenspannung und zum geringfügigen Zurückziehen des Schussfadens 2 dient der Fadenspanner 3, dessen Aufbau in Fig. 2 im einzelnen zu sehen ist. Der Fadenspanner 3 besteht im wesentlichen aus einer auf der Grundplatte 31 mittels der Schraube 39 befestigten Lamelle 36, welche zwischen Seitenplatten 32 und 33 seitlich geführt ist. Unter der Wirkung der ausströmenden Luft aus der Bohrung 36 gemäss Pfeil 37 wird die Lamelle gegen den Schussfaden 2 gedrückt, der durch die Oesen 341 bzw. 351 in den Stirnplatten 34 und 35 läuft. Der Grad der Schussfadenumlenkung innerhalb des Fadenspanners und somit seine Spannung während des Eintrages kann durch Regulierung der zugeführten Luft erreicht werden. Das freie Ende der Lamelle 36 bewegt sich im wesentlichen innerhalb der Mulde 30. Durch die Form der Lamelle 36, die Lage der Mulde 30 und die Seitenplatten 32 und 33 wird die aus der Bohrung 37 ausströmende Luft am freien Abströmen zwischen den Platten 32 und 33 gehindert, wodurch sich ein vertretbar geringer Luftverbrauch ergibt. Das Innere des Fadenspanners wird durch die abströmende Luft von Ablagerungen freigehalten. Die im Fadenspanner 3 benötigte Luft kann beispielsweise als Abluft von der Absaugeinrichtung 40 auf der Fangseite 16 verwendet werden. Im Gegensatz zu anderen Fadenspannern, bei welchen die Luft ohne ein Ablenkelement direkt auf den Schussfaden einwirkt, wird hier der Schussfaden durch die Luftströmungen nur minimal beansprucht.The weft thread 2 runs from the weft thread store 1 in the direction of the arrow 2ʹ into the thread tensioner 3 and from there through the eyelet of the weft thread selector 4 to the rapier gripper 5. Such a rapier gripper is described in US Pat. No. 4,071,055. Its function is therefore not explained further here. The rapier gripper 5 takes over the weft thread 2 by moving it along the stop line 13 into the shed 11 formed by the warp threads 7 and 8. Before the carrier gripper 5 enters the shed 11, the weft thread 2 is cut by the scissors 9. The rapier gripper pulls the weft thread into the shed 11 according to arrow 52 up to the position 5ʹ, where the slave gripper 6 in the position 6ʹ takes over the weft thread tip 21 from the rapier gripper 5 and is retracted according to the directional arrow 62 until it emerges from the shed 11 with the scissors 10 . After the take-off gripper 6 emerges from the shed, the weft thread tip 21 is released and clamped by the edge warp threads 71. During the entire course of the weft thread insertion, the weft thread should be kept under as constant a tension as possible, so that no transfer errors occur from the weft thread selector 4 to the gripper 5, from the gripper 5 to the gripper 6. The tension in the weft thread should also be constant after the release by the slave gripper 6 until it strikes the stop line 13, which is necessary to achieve a uniform fabric image. As indicated at the beginning, strong fluctuations in the weft thread speed occur during the weft insertion. When transferring the weft thread from the hook to the The pick thread comes to a standstill, the weft even has to be pulled back a little. The thread tensioner 3 is used to keep the thread tension constant and to retract the weft thread 2 slightly, the structure of which can be seen in detail in FIG. 2. The thread tensioner 3 consists essentially of a plate 36 fastened on the base plate 31 by means of the screw 39 and guided laterally between side plates 32 and 33. Under the action of the air flowing out of the bore 36 according to arrow 37, the lamella is pressed against the weft thread 2, which runs through the eyelets 341 and 351 in the end plates 34 and 35. The degree of weft deflection within the thread tensioner and thus its tension during the entry can be achieved by regulating the air supplied. The free end of the lamella 36 moves essentially within the trough 30. The shape of the lamella 36, the position of the trough 30 and the side plates 32 and 33 make the air flowing out of the bore 37 flow freely between the plates 32 and 33 hindered, which results in a reasonably low air consumption. The inside of the thread tensioner is kept free of deposits by the outflowing air. The air required in the thread tensioner 3 can be used, for example, as exhaust air from the suction device 40 on the catching side 16. In contrast to other thread tensioners, in which the air acts directly on the weft thread without a deflection element, the weft thread is only minimally stressed by the air currents.

Die Lamelle 36 wird von oben durch den Schussfaden und die Schwerkraft aufgrund ihrer eigenen Masse sowie von unten her durch das Kraftfeld der gegen sie anströmenden Luft im Gleichgewicht gehalten. Die Lamelle wird möglichst massenarm ausgebildet, damit sie rasch auf Veränderungen im Schussfadenlauf reagieren kann.The lamella 36 is from above by the weft thread and gravity due to its own mass as well as kept below in balance by the force field of the air flowing against them. The slat is designed with as little mass as possible so that it can react quickly to changes in the weft thread.

Anstatt mittels Luft kann auf die Lamelle auch auf andere Weise ein Kraftfeld aufgebracht werden, beispielsweise durch ein elektromagnetisches Feld. In diesem Fall wird oberhalb einer Lamelle aus magnetisierbarem Material ein Dauermagnet oder Elektromagnet angeordnet. In der Ausführungsform des Fadenspanners mit Luftanschluss wird die Lamelle 36 mit Vorteil aus Kunststoff, beispielsweise aus kohlefaserverstärktem Kunstharz hergestellt.Instead of using air, a force field can also be applied to the lamella in another way, for example by an electromagnetic field. In this case, a permanent magnet or electromagnet is arranged above a lamella made of magnetizable material. In the embodiment of the thread tensioner with an air connection, the lamella 36 is advantageously produced from plastic, for example from carbon fiber-reinforced synthetic resin.

Wenn die Spannung des Schussfadens 2 einen bestimmten Wert unterschreitet, wird die Lamelle 36 beispielsweise in die gestrichelte Position 362 gedrückt, wobei die Lamelle mit ihrem Rücken an einem quer in den Seitenplatten 32,33 befestigten Bolzen 70 ansteht und der Schussfaden 2, in Fig. 2 in der strichpunktierten Position 22 eingezeichnet, zwischen der Lamelle 362 und dem Bolzen 70 eingeklemmt wird, so dass kein Schussfaden mehr von rechts nachgezogen werden kann. Wenn die Lamelle 36 biegeweich ausgeführt ist, wird sie durch den Bolzen 70 gekrümmt, wodurch im Bereich links des Bolzens 70 in Fig. 2 der Schussfaden 2 weiter zurückgezogen wird, ohne dass vom Schussfadenspeicher 1 Faden nachgezogen werden kann. Durch das Zusammenwirken der Lamelle 36 mit dem Bolzen 70 ist es möglich, mit besonders niedriger Schussfadenspannung zu arbeiten.If the tension of the weft thread 2 falls below a certain value, the lamella 36 is pressed, for example, into the dashed position 362, the lamella having its back against a bolt 70 fastened transversely in the side plates 32, 33 and the weft thread 2, in FIG. 2 is drawn in the dash-dotted position 22, is clamped between the lamella 362 and the bolt 70, so that no weft thread can be retightened from the right. If the lamella 36 is designed to be flexible, it is curved by the bolt 70, as a result of which the weft thread 2 is retracted further in the area to the left of the bolt 70 in FIG. 2, without 1 thread being able to be drawn from the weft thread store. The interaction of the lamella 36 with the bolt 70 makes it possible to work with a particularly low weft thread tension.

Claims (9)

1. Einrichtung zum Spannen eines einer Textilmaschine vorgelegten Fadens, wobei ein quer zum Fadenlauf wirksames Auslenkelement vorgesehen ist, dadurch gekennzeichnet, dass das Auslenkelement (36) massenarm ausgebildet ist und durch ein in die Auslenkrichtung (37') wirksames Kraftfeld beaufschlagbar ist.1. Device for tensioning a thread presented to a textile machine, wherein a deflection element effective transversely to the thread run is provided, characterized in that the deflection element (36) is designed with low mass and can be acted upon by a force field effective in the deflection direction (37 '). 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass am Fadenspanner ein Luftanschluss (37) vorgesehen ist, wobei die Austrittsöffnung für die Luft quer zum Auslenkelement gerichtet ist, so dass bei Luftzufuhr zum Fadenspanner ein Kraftfeld am Auslenkelement wirksam wird.2. Device according to claim 1, characterized in that an air connection (37) is provided on the thread tensioner, the outlet opening for the air being directed transversely to the deflection element, so that a force field on the deflection element becomes effective when air is supplied to the thread tensioner. 3. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Auslenkelement durch eine einseitig an einer Grundplatte (31) befestigte gebogene Lamelle (36) gebildet wird.3. Device according to claim 1, characterized in that the deflecting element is formed by a curved lamella (36) fastened on one side to a base plate (31). 4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass zur seitlichen Führung der Lamelle (36) Seitenplatten (32,33) am Fadenspanner angeordnet sind.4. Device according to claim 3, characterized in that for the lateral guidance of the lamella (36) side plates (32, 33) are arranged on the thread tensioner. 5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, dass zwischen der Grundplatte (31) und der Lamelle (36) einerseits und den Seitenplatten (32,33) andererseits ein Raum definiert ist, aus dem die Luft nur durch Spalte zwischen der Lamelle (36) und dem an sie angrenzenden Platten (31,32,33) entweichen kann.5. Device according to claim 4, characterized in that between the base plate (31) and the lamella (36) on the one hand and the side plates (32,33) on the other hand, a space is defined from which the air only through gaps between the lamella (36 ) and the adjacent plates (31,32,33) can escape. 6. Einrichtung nach Anspruch 1, gekennzeichnet durch Oesen (341,351) zur Führung des Fadens, welche in Fadenlaufrichtung vor und hinter dem Auslenkelement (36) angeordnet sind.6. Device according to claim 1, characterized by eyelets (341, 351) for guiding the thread, which are arranged in the thread running direction in front of and behind the deflecting element (36). 7. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Auslenkweg des Auslenkelementes (35) durch einen Anschlag (70) begrenzt ist, wobei der Schussfaden beim Aufliegen des Auslenkelementes (36) auf dem Anschlag (70) festgeklemmt wird.7. Device according to claim 1, characterized in that the deflection path of the deflection element (35) is limited by a stop (70), the weft thread being clamped on the stop (70) when the deflection element (36) rests. 8. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Lamelle (36) biegeweich ausgebildet ist.8. Device according to claim 3, characterized in that the lamella (36) is designed to be flexible. 9. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Lamelle (36) aus kohlefaserverstärktem Kunststoff gefertigt ist.9. Device according to claim 3, characterized in that the lamella (36) is made of carbon fiber reinforced plastic.
EP19870810518 1986-10-20 1987-09-08 Thread tension device for a textile machine Expired - Lifetime EP0268550B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH417286 1986-10-20
CH4172/86 1986-10-20

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EP0268550A1 true EP0268550A1 (en) 1988-05-25
EP0268550B1 EP0268550B1 (en) 1991-12-11

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EP19870810518 Expired - Lifetime EP0268550B1 (en) 1986-10-20 1987-09-08 Thread tension device for a textile machine

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EP (1) EP0268550B1 (en)
JP (1) JPS63105148A (en)
DE (1) DE3775180D1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356380A1 (en) * 1988-08-25 1990-02-28 Sulzer RàœTi Ag Method to avoid stress peaks in the weft at insertion during braking
GB2283762A (en) * 1993-11-11 1995-05-17 Fabio Botturi Yarn feeding device for a loom
US5425399A (en) * 1993-04-16 1995-06-20 Nissan Texsys Co., Ltd. Weft picking system for jet loom with device for deforming a weft yarn slackened portion
US5544680A (en) * 1993-12-22 1996-08-13 Picanol N.V. Weft thread brake with rotary drive
EP0790208A1 (en) * 1996-02-16 1997-08-20 Iro Ab Device for deflecting a yarn
WO2012041508A1 (en) * 2010-09-30 2012-04-05 Honigmann Industrielle Elektronik Gmbh Dancer device
WO2021078791A1 (en) * 2019-10-21 2021-04-29 Maschinenfabrik Rieter Ag Method of driving a mechanical element comprising a yarn catch on a textile machine, a device for moving yarn on a textile machine and a textile machine

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
JPH0640603Y2 (en) * 1988-08-09 1994-10-26 日産テクシス株式会社 Weft tensioner device for weaving machine with weft threading device

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CH182692A (en) * 1934-01-17 1936-02-29 Tefag Textil Finanz Ag Method and device for regulating the weft thread tension in looms, in particular those with rapier shuttle.
FR2352086A1 (en) * 1976-05-17 1977-12-16 Saurer Diederichs Sa DEVICE FOR RETENTING A WEFT YARN ON FEEDING IN A WEAVING MACHINE WITHOUT SHUTTLE
FR2466548A1 (en) * 1979-09-27 1981-04-10 Cretin Louis Atel Shuttleless loom weft withdrawal device - cuts down weft losses at selvedges

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JPS5940721A (en) * 1982-08-30 1984-03-06 Sony Tektronix Corp Diagnostic device for digital-analog converter

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Publication number Priority date Publication date Assignee Title
CH182692A (en) * 1934-01-17 1936-02-29 Tefag Textil Finanz Ag Method and device for regulating the weft thread tension in looms, in particular those with rapier shuttle.
FR2352086A1 (en) * 1976-05-17 1977-12-16 Saurer Diederichs Sa DEVICE FOR RETENTING A WEFT YARN ON FEEDING IN A WEAVING MACHINE WITHOUT SHUTTLE
FR2466548A1 (en) * 1979-09-27 1981-04-10 Cretin Louis Atel Shuttleless loom weft withdrawal device - cuts down weft losses at selvedges

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356380A1 (en) * 1988-08-25 1990-02-28 Sulzer RàœTi Ag Method to avoid stress peaks in the weft at insertion during braking
US4962796A (en) * 1988-08-25 1990-10-16 Sulzer Brothers Limited Weft brake with damping control
US5425399A (en) * 1993-04-16 1995-06-20 Nissan Texsys Co., Ltd. Weft picking system for jet loom with device for deforming a weft yarn slackened portion
GB2283762A (en) * 1993-11-11 1995-05-17 Fabio Botturi Yarn feeding device for a loom
GB2283762B (en) * 1993-11-11 1997-03-26 Fabio Botturi Yarn feeding device for a loom
US5544680A (en) * 1993-12-22 1996-08-13 Picanol N.V. Weft thread brake with rotary drive
EP0790208A1 (en) * 1996-02-16 1997-08-20 Iro Ab Device for deflecting a yarn
WO2012041508A1 (en) * 2010-09-30 2012-04-05 Honigmann Industrielle Elektronik Gmbh Dancer device
WO2021078791A1 (en) * 2019-10-21 2021-04-29 Maschinenfabrik Rieter Ag Method of driving a mechanical element comprising a yarn catch on a textile machine, a device for moving yarn on a textile machine and a textile machine
CN114787059A (en) * 2019-10-21 2022-07-22 里特机械公司 Method for driving a mechanical element comprising a yarn catcher on a textile machine, device for moving a yarn on a textile machine and textile machine

Also Published As

Publication number Publication date
EP0268550B1 (en) 1991-12-11
DE3775180D1 (en) 1992-01-23
JPS63105148A (en) 1988-05-10

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