EP1576219B1 - Device and method for stretching - Google Patents

Device and method for stretching Download PDF

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Publication number
EP1576219B1
EP1576219B1 EP03789093A EP03789093A EP1576219B1 EP 1576219 B1 EP1576219 B1 EP 1576219B1 EP 03789093 A EP03789093 A EP 03789093A EP 03789093 A EP03789093 A EP 03789093A EP 1576219 B1 EP1576219 B1 EP 1576219B1
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EP
European Patent Office
Prior art keywords
weft thread
thread
weft
deflecting
piston
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.)
Expired - Lifetime
Application number
EP03789093A
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German (de)
French (fr)
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EP1576219A1 (en
Inventor
Jean Marie Bamelis
Chris Delanote
Jozef Peeters
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Picanol NV
Original Assignee
Picanol NV
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Filing date
Publication date
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Publication of EP1576219A1 publication Critical patent/EP1576219A1/en
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    • 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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the weft
    • 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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the invention relates to a device and a method for stretching a weft thread inserted into a shed, in particular for air jet looms.
  • weft threads are entered at high speeds in a shed. Due to the driving forces and due to the braking forces at the end of the weaving process, the weft threads are elastically stretched. Due to this elongation, the weft threads tend to jump back into the shed upon completion of the weft insertion and form loops or loops there. Such loops or loops mean weaving errors.
  • so-called stretching nozzles are arranged on the side opposite the entry side of the shed, which stretch with a stream of air the registered weft thread and keep stretched. This tensioning and stretching can be further supported by the fact that the so-called auxiliary blowing nozzles or relay nozzles remain switched on after the weft insertion for a certain period of time. In order to apply a sufficiently high force for the stretching, a relatively large length of weft thread must be taken up by the stretching nozzle. In addition, the air consumption of such a stretching nozzle is relatively high.
  • an air jet loom with a weft insertion device wherein the weft insertion device enters the weft thread via a weft insertion channel in the shed, the weft thread is supported in the shed over a plurality of juxtaposed Staffettendüsen to the catcher side, on the catch side a clamping device consisting of a Clamping and one or more guided transversely to the weft thread clamping threads, is arranged, which clamps the weft thread end during the Abbindevorganges, and in the weft direction before the clamping device a stretching device is arranged outside the reed, which stretches the weft thread defined in the clamping device to form a weft thread loop and with it.
  • the invention has for its object to provide an improved device for straightening a registered weft thread.
  • This object is achieved in that on the side opposite the entry side of a shed an operable by means of a control thread clamp for clamping the weft yarn is provided in front of - as seen in weft transport direction - an operable by means of a control device for deflecting the weft thread, and the Device for deflecting as actuating device includes at least one pneumatic piston-cylinder unit.
  • the thread clamp and the device for deflecting on the same side i. are arranged on the entry side opposite side of a shed. Otherwise the risk of loops or loops being created is particularly high on this side.
  • the thread clamp prevents the registered weft thread springs back into the shed. Since it will not be possible in most cases to clamp the weft exactly at the moment in which it has completed its insertion movement, but has not yet moved back again, the means for deflecting and tensioning is provided. This ensures that the weft is then held stretched when he should have moved back a bit. In this way it is achieved that the tension of the weft thread over the weaving width is substantially the same, so that a good fabric quality is obtained.
  • a device for detecting the movement of a weft thread is provided, the signal is converted into actuation signals for the thread clamp and the means for deflecting. Since differences in the entry movement of the weft threads can occur, it is advantageous if the operation of the thread clamp and the means for deflecting in response to the detected movement of the weft thread, since then a better timing is possible.
  • a detector of a Vorspultechniks that detects the number of withdrawn at a weft insertion turns of the weft.
  • the signal is triggered on the entry side, so that even at very high web speeds sufficient time remains to operate the thread brake and the device for deflecting in a timely manner.
  • the size of the deflection force of the device for deflecting the weft thread is adjustable, controllable or controllable.
  • This adaptation to weft threads with different materials is possible to stretch a weft sufficiently without tearing it.
  • the invention is provided in a further embodiment that the course of the deflection force during the deflection of the weft thread is adjustable. It can be done, for example, that are provided in a further embodiment of the invention, at least two independently operable devices for deflecting.
  • Independently actuatable means for deflecting may also be useful if the materials of two weft threads to be successively inserted are so different that a different deflection force makes sense for them and this different deflection force is not possible by changing the setting of the same device.
  • a method for stretching in which the weft thread is clamped at least approximately with the end of the entry on the opposite side of the entry side and then held by deflection stretched until it is struck, the weft thread with a piston Cylinder unit is deflected, which is controllable or regulated.
  • a weft thread 10 is withdrawn from a supply spool, not shown by means of a Vorspulsammlungs 11 and wound in several turns on a drum of this Vorspulauss.
  • the weft thread 10 is held in two main blowing nozzles 12, 13. Between the Vorspul réelle 11 and the Hauptblasdüsen 12, 13 a yarn brake 14 is arranged.
  • the weft thread is blown by means of the main blower nozzles 12, 13 in a shed, which is formed in the region of a reed 15 from warp threads, not shown.
  • the lamellae are provided in a known manner with a U-shaped recess which is open to the fabric edge of the fabric, not shown.
  • the transport of the weft thread 10 in the weft transport channel 16 is supported by Hilfsblasdüsen or Stafettendüsen 17, each of which directs a blast of air in the weft transport channel 16.
  • Weft threads usually consist of a relatively elastic material. Due to the high working speeds they are elastically stretched when entering into a shed and in particular when braking at the end of the weft insertion. This elastic elongation is the reason why a registered weft thread has the tendency to jump back into the interior of the shed, or into the interior of the weft transport channel 16. He then forms in this area loops, which lead to a weaving error.
  • a thread clamp 22 is provided which engages the registered weft thread 10 on the entry side opposite side of a shed and stuck. Since it is not ensured that the inserted weft thread is grasped in time, i. if it is still (sufficiently) stretched, on the side opposite the entry side of the shed the thread clamp 22 is preceded by a device 23 with which the weft thread 10 is deflected and thus tensioned.
  • the thread clamp 22 and the device 23 are designed and arranged so that they do not hinder the entry of a weft thread.
  • the control device 21 forms an actuating signal for the thread clamp 22 and the device 23 as a function of the detected movement of the weft thread 10 during entry. In order to have a sufficient time for the operation of the thread clamp 22 and the device 23, the movement of the weft thread 10 is detected on the entry side. In the embodiment, this is done by means of the detector 20, which counts the withdrawn during the weft insertion of the drum of the Vorspultechniks 11 turns.
  • the control device 21 forms the actuating signal for the thread clamp 22 and the device 23 in response to the signal, the penultimate withdrawn turn corresponds.
  • the beginning and the end of the operation of the yarn brake 22 and the device 23 can be adjusted via the control device 21 in order to adapt to the material of the weft threads and / or the type of fabric weave.
  • FIGS. 1 and 2 are provided as actuators for the thread clamp 22 and the device 23 pneumatic piston-cylinder units 24, 25, which have very short switching times, since between the beginning and end of pressing only relatively short periods of time are available which are on the order of 20 ms.
  • the piston-cylinder units 24, 25 of the embodiment are driven in both directions with compressed air, so that no return springs are present.
  • the beginning and end of the operation of the thread clamp 22 and the device 23 is determined by the control device 21, which controls the compressed air supply to the piston-cylinder units 24, 25 via solenoid valves 26, 27.
  • the solenoid valves 26, 27 are preferably 5/3-way valves.
  • compressed air source is a compressed air reservoir or compressed air tank 28, is stored in the compressed air at a relatively high pressure, for example 6 bar.
  • the piston-cylinder unit 24 of the thread clamp 22 is supplied directly with the high pressure via the valve 26, so that for the thread clamp 22 very short switching times can be achieved.
  • the piston-cylinder unit 25 of the device 23 for deflecting is subjected to a variable pressure. In this case, a pressure curve is sought, as shown for example in Fig. 5.
  • the piston-cylinder unit 25 of the device 23 is subjected to a high pressure in order to trigger the movement as quickly as possible. After that, the pressure is reduced to a lower value, so that the force is reduced, with which the weft thread 10 is kept taut.
  • the pressure profile shown in Fig. 5 is achieved in that the solenoid valve 27, a throttle valve 29 and a small reservoir 30 are connected upstream. As long as the solenoid valve 27 blocks the line in the extension direction to the piston-cylinder unit 25, a pressure builds up in the small reservoir 30, which essentially corresponds to the pressure in the compressed-air tank 28. If the solenoid valve 27 in the extension direction the connection to the piston-cylinder unit 25 ago, so this is briefly applied to the full pressure until the reservoir 30 is emptied so far that it is refilled with the throttled by the throttle valve 29 pressure. This results in the pressure curve shown in Fig.
  • the throttling of the throttle valve 29 is preferably adjustable via an input device and the control device 21 in order to adapt to different materials of the weft threads and / or also to different weave bindings.
  • the throttle position of the throttle valve 29 can also be adjusted, controlled or regulated during weaving.
  • the control device 21 is actuated by means of a solenoid valve 31 of the piston-cylinder unit 25 connects a second compressed air supply.
  • the designed as shut-off valve solenoid valve 31 is preceded by an adjustable throttle valve 32, which is set to a higher pressure value than the throttle valve 29.
  • the actuation of the solenoid valve 31 may by the controller 21 a predetermined setting of a time period or an angular position of the Main shaft of the loom done.
  • a position detector 33 is associated with the piston of the piston-cylinder unit 25 of the device 23, which outputs a signal depending on the position of the piston or in a predetermined position, the second pressure peak causes.
  • the beginning and the end of the actuation of the thread clamp 22 and the device 23 can take place in predetermined periods of time after the signal of the detector 20.
  • the beginning and the end of the pressing is also determined in dependence on the angular positions ⁇ of the main shaft of the loom, since the movement of the sley and thus of the reed 15 is associated with these angular positions.
  • the time span between the arrival of the weft thread at the weft detector 19 and the signal from the detector 20 can also be taken into account.
  • the elements of the thread clamp 22 and the device 23 are arranged on the batten of the loom, which carries the reed 15. The arrangement is made so that all elements are in the rest position outside the contour of the weft transport channel, as can be seen from Figure 6.
  • Fig. 2 there is a stationary clamping member 34 above the weft transport channel 16.
  • the piston-cylinder unit 24 is arranged below the weft transport channel so far that the outermost end of the piston 35 is in the rest position below the weft transport channel 16.
  • the piston-cylinder unit 25 is likewise arranged below the weft transport channel 16 such that the piston 36 is completely below the weft transport channel 16 in the rest position.
  • the device 23 includes two deflecting elements 37, 38, which are arranged above the weft transport channel 16.
  • the piston 36, together with the weft thread 10, can be moved into the region between the two deflection elements 37, 38, and takes the weft 10 with.
  • the deflection path of the weft thread 10 therefore corresponds to twice the travel of the piston 36.
  • the thread clamp 22 can be followed by another weft guard 39.
  • a stretching nozzle 40 may be arranged, which blows from a arranged below the weft transport channel 16 blowing a compressed air jet together with the end of the weft thread in a perpendicular to the weft transport channel 16 extending above the weft transport channel 16 arranged pipe.
  • the tube and the blow opening are aligned obliquely or parallel to the weft transport channel 16.
  • two means 23 and 23 'for deflecting the weft thread can be arranged one behind the other.
  • the device 23 'then also has a piston-cylinder unit 25', the piston between two stationary deflecting elements 37 and 37 'is movable upwards.
  • a second device 23 'for deflecting a registered weft thread can also be useful if the loom is running very fast and weft threads must be entered from very different material in a row.
  • the piston-cylinder unit 25 ' would have to be equipped with its own solenoid valve and its own pressure supply line, which can be controlled independently of the control device 21.
  • the device 23 can be provided as shown in Fig. 4.
  • the piston-cylinder unit 25 is with a fork-shaped piston 41 is provided, the two prongs between the deflecting elements 37 ', 37 and 38 are hineinbewegbar.
  • the device according to the invention also makes it possible to remedy a weft breakage, for example after DE 37 30 480 without obstruction.
  • the device is not actuated, so that all elements are in a position in which a weft thread is free to move through the weft transport channel 16.
  • a weft scissors is provided immediately after the weft guard 19.
  • the device 23, 23 'or 23 "has been arranged in each case on the side of the shed facing the entry side, ie on the side facing away from the pre-pulser 11.
  • a device for deflecting on the entry side
  • the thread brake 14 present on the entry side, which is controlled in such a way that it deflects the inserted weft thread after the thread clamp 22 has been actuated
  • the thread brake has an adjustable deflection element 42 which can be moved in between two stationary deflection elements 43.
  • a means for deflecting between both fabrics can be arranged.
  • the means for deflecting can be arranged at any point between the thread stopper 18 and the thread clamp 22 in principle.

Abstract

A thread stretching device for a weaving machine, especially an air jet weaving machine, includes a thread gripper (22) for gripping the weft thread (10) as a device for stretching a weft thread inserted into a shed. A mechanism (23) for deflecting the weft thread is arranged upstream of the thread gripper, relative to the weft thread transport direction.

Description

Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Strecken eines in ein Webfach eingetragenen Schussfadens, insbesondere für Luftdüsenwebmaschinen.The invention relates to a device and a method for stretching a weft thread inserted into a shed, in particular for air jet looms.

Schussfäden werden mit hohen Geschwindigkeiten in ein Webfach eingetragen. Aufgrund der Antriebskräfte und aufgrund der Bremskräfte am Ende des Webvorganges werden die Schussfäden elastisch gedehnt. Aufgrund dieser Dehnung haben die Schussfäden die Neigung, nach Beenden des Schusseintrags in das Webfach zurückzuspringen und dort Schlingen oder Schlaufen zu bilden. Derartige Schlingen oder Schlaufen bedeuten Webfehler. Um das Zurückspringen zu verhindern werden üblicherweise auf der der Eintragsseite gegenüberliegenden Seite des Webfaches sogenannte Streckdüsen angeordnet, die mit einem Luftstrom den eingetragenen Schussfaden spannen und gestreckt halten. Dieses Spannen und Strecken kann noch dadurch unterstützt werden, dass die sogenannten Hilfsblasdüsen oder Stafettendüsen nach dem Schusseintrag noch über einen gewissen Zeitraum eingeschaltet bleiben. Um eine ausreichend hohe Kraft für das Strecken aufzubringen, muss eine relativ große Länge an Schussfaden von der Streckdüse aufgenommen werden. Außerdem ist der Luftverbrauch einer derartigen Streckdüse relativ hoch.Weft threads are entered at high speeds in a shed. Due to the driving forces and due to the braking forces at the end of the weaving process, the weft threads are elastically stretched. Due to this elongation, the weft threads tend to jump back into the shed upon completion of the weft insertion and form loops or loops there. Such loops or loops mean weaving errors. In order to prevent the springing back usually so-called stretching nozzles are arranged on the side opposite the entry side of the shed, which stretch with a stream of air the registered weft thread and keep stretched. This tensioning and stretching can be further supported by the fact that the so-called auxiliary blowing nozzles or relay nozzles remain switched on after the weft insertion for a certain period of time. In order to apply a sufficiently high force for the stretching, a relatively large length of weft thread must be taken up by the stretching nozzle. In addition, the air consumption of such a stretching nozzle is relatively high.

Aus der EP 0 335 011 A1 ist eine Luftdüsenwebmaschine mit einer Schussfadeneintragsvorrichtung bekannt, wobei die Schussfadeneintragsvorrichtung den Schussfaden über einen Schusseintragskanal in das Webfach einträgt, der Schussfaden im Webfach über eine Vielzahl nebeneinander angeordneter Staffettendüsen zur Fangseite getragen wird, an der Fangseite eine Klemmeinrichtung, bestehend aus einem Klemmbock und einem oder mehreren quer zum Schussfaden geführten Klemmfäden, angeordnet ist, welche das Schussfadenende während des Abbindevorganges klemmend festhält, und in Schussrichtung vor der Klemmeinrichtung eine Streckeinrichtung ausserhalb des Webblattes angeordnet ist, welche den in der Klemmeinrichtung festgelegten Schussfaden unter Bildung einer Schussfadenschlaufe streckt und damit spannt.From the EP 0 335 011 A1 an air jet loom with a weft insertion device is known, wherein the weft insertion device enters the weft thread via a weft insertion channel in the shed, the weft thread is supported in the shed over a plurality of juxtaposed Staffettendüsen to the catcher side, on the catch side a clamping device consisting of a Clamping and one or more guided transversely to the weft thread clamping threads, is arranged, which clamps the weft thread end during the Abbindevorganges, and in the weft direction before the clamping device a stretching device is arranged outside the reed, which stretches the weft thread defined in the clamping device to form a weft thread loop and with it.

Der Erfindung liegt die Aufgabe zugrunde, eine verbesserte Vorrichtung zum Gestreckthalten eines eingetragenen Schussfadens zu schaffen.The invention has for its object to provide an improved device for straightening a registered weft thread.

Diese Aufgabe wird dadurch gelöst, dass auf der der Eintragsseite gegenüberliegenden Seite eines Webfaches eine mittels einer Steuereinrichtung betätigbare Fadenklemme zum Klemmen des Schussfadens vorgesehen ist, vor der - gesehen in Schussfadentransportrichtung - eine mittels einer Steuereinrichtung betätigbare Einrichtung zum Auslenken des Schussfadens angeordnet ist, und die Einrichtung zum Auslenken als Betätigungsvorrichtung wenigstens eine pneumatische Kolben-Zylindereinheit enthält.This object is achieved in that on the side opposite the entry side of a shed an operable by means of a control thread clamp for clamping the weft yarn is provided in front of - as seen in weft transport direction - an operable by means of a control device for deflecting the weft thread, and the Device for deflecting as actuating device includes at least one pneumatic piston-cylinder unit.

Bei einer bevorzugten Weiterbildung wird vorgesehen, dass die Fadenklemme und die Einrichtung zum Auslenken auf der gleichen Seite, d.h. auf der der Eintragsseite gegenüberliegenden Seite eines Webfachs angeordnet sind. Auf dieser Seite ist sonst die Gefahr des Entstehens von Schlingen oder Schlaufen besonders hoch.In a preferred embodiment it is provided that the thread clamp and the device for deflecting on the same side, i. are arranged on the entry side opposite side of a shed. Otherwise the risk of loops or loops being created is particularly high on this side.

Mittels der Fadenklemme wird verhindert, dass der eingetragene Schussfaden in das Webfach zurückspringt. Da es in den meisten Fällen nicht möglich sein wird, den Schussfaden exakt in dem Moment zu klemmen, in welchem er seine Eintragsbewegung vollendet hat, sich jedoch noch nicht wieder zurückbewegt hat, wird die Einrichtung zum Auslenken und Spannen vorgesehen. Diese stellt sicher, dass der Schussfaden auch dann gestreckt gehalten wird, wenn er sich schon wieder ein Stück zurück bewegt haben sollte. Auf diese Weise wird erreicht, dass die Spannung des Schussfadens über die Webbreite im wesentlichen gleich ist, so dass eine gute Gewebequalität erhalten wird.By means of the thread clamp prevents the registered weft thread springs back into the shed. Since it will not be possible in most cases to clamp the weft exactly at the moment in which it has completed its insertion movement, but has not yet moved back again, the means for deflecting and tensioning is provided. This ensures that the weft is then held stretched when he should have moved back a bit. In this way it is achieved that the tension of the weft thread over the weaving width is substantially the same, so that a good fabric quality is obtained.

In weiterer Ausgestaltung der Erfindung wird eine Einrichtung zum Erkennen der Bewegung eines Schussfadens vorgesehen, deren Signal in Betätigungssignale für die Fadenklemme und die Einrichtung zum Auslenken umgewandelt wird. Da Unterschiede in der Eintragsbewegung der Schussfäden auftreten können, ist es vorteilhaft, wenn die Betätigung der Fadenklemme und der Einrichtung zum Auslenken in Abhängigkeit der erkannten Bewegung des Schussfadens erfolgt, da dann eine bessere zeitliche Abstimmung möglich ist. In weiterer vorteilhafter Ausgestaltung der Erfindung wird vorgesehen, dass als Einrichtung zum Erfassen der Bewegung des Schussfadens ein Detektor eines Vorspulgerätes dient, der die Anzahl der bei einem Schusseintrag abgezogenen Windungen des Schussfadens erfasst. Damit wird das Signal auf der Eintragsseite ausgelöst, so dass auch bei sehr hohen Webgeschwindigkeiten ausreichend Zeit verbleibt, die Fadenbremse und die Einrichtung zum Auslenken rechtzeitig zu betätigen.In a further embodiment of the invention, a device for detecting the movement of a weft thread is provided, the signal is converted into actuation signals for the thread clamp and the means for deflecting. Since differences in the entry movement of the weft threads can occur, it is advantageous if the operation of the thread clamp and the means for deflecting in response to the detected movement of the weft thread, since then a better timing is possible. In a further advantageous embodiment of the invention it is provided that serves as a device for detecting the movement of the weft yarn, a detector of a Vorspulgerätes that detects the number of withdrawn at a weft insertion turns of the weft. Thus, the signal is triggered on the entry side, so that even at very high web speeds sufficient time remains to operate the thread brake and the device for deflecting in a timely manner.

In weiterer Ausgestaltung der Erfindung wird vorgesehen, dass die Größe der Auslenkkraft der Einrichtung zum Auslenken des Schussfadens einstellbar, steuerbar oder regelbar ist. Damit ist einer Anpassung an Schussfäden mit unterschiedlichen Materialien möglich, um einen Schussfaden ausreichend zu strecken ohne ihn zu zerreißen. Zu dem Zweck einer Anpassung an Schussfäden aus unterschiedlichen Materialien wird in weiterer Ausgestaltung der Erfindung vorgesehen, dass der Verlauf der Auslenkkraft während des Auslenkens des Schussfadens einstellbar ist. Es kann beispielsweise dadurch erfolgen, dass in weiterer Ausgestaltung der Erfindung wenigstens zwei unabhängig voneinander betätigbare Einrichtungen zum Auslenken vorgesehen sind. Unabhängig betätigbare Einrichtungen zum Auslenken können gegebenenfalls auch dann sinnvoll sein, wenn die Materialien von zwei aufeinanderfolgend einzutragenden Schussfäden so verschieden sind, dass für sie eine unterschiedliche Auslenkkraft sinnvoll ist und diese unterschiedliche Auslenkkraft durch Verändern der Einstellung der gleichen Vorrichtung nicht möglich ist.In a further embodiment of the invention, it is provided that the size of the deflection force of the device for deflecting the weft thread is adjustable, controllable or controllable. This adaptation to weft threads with different materials is possible to stretch a weft sufficiently without tearing it. For the purpose of adaptation to weft threads made of different materials, the invention is provided in a further embodiment that the course of the deflection force during the deflection of the weft thread is adjustable. It can be done, for example, that are provided in a further embodiment of the invention, at least two independently operable devices for deflecting. Independently actuatable means for deflecting may also be useful if the materials of two weft threads to be successively inserted are so different that a different deflection force makes sense for them and this different deflection force is not possible by changing the setting of the same device.

In weiterer Ausgestaltung der Erfindung wird ein Verfahren zum Strecken vorgesehen, bei welchem der Schussfaden wenigstens annähernd mit dem Ende des Eintragens auf der der Eintragsseite gegenüberliegenden Seite geklemmt und dann durch Auslenken gespannt gehalten wird, bis er angeschlagen wird, wobei der Schussfaden mit einer Kolben-Zylindereinheit ausgelenkt wird, die steuerbar oder regelbar ist.In a further embodiment of the invention, a method for stretching is provided in which the weft thread is clamped at least approximately with the end of the entry on the opposite side of the entry side and then held by deflection stretched until it is struck, the weft thread with a piston Cylinder unit is deflected, which is controllable or regulated.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in der Zeichnung dargestellten Ausführungsbeispiele und den Unteransprüchen.

Fig. 1
zeigt in schematischer Darstellung den Aufbau einer erfindungsgemäßen Vorrichtung für eine Luftdüsenwebmaschine,
Fig. 2
eine Teilansicht der Ausführungsform nach Fig. 1 in größerem Maßstab,
Fig. 3
eine Teilansicht einer abgewandelten Vorrichtung,
Fig. 4
eine Teilansicht einer nochmals abgewandelten Vorrichtung,
Fig. 5
ein Diagramm des Verlaufs einer Auslenkkraft während des Streckens eines eingetragenen Schussfadens und
Fig. 6
eine Aussicht auf die Vorrichtung nach Figur 1 entgegen der Schussfadentransportrichtung.
Further features and advantages of the invention will become apparent from the following description of the embodiments illustrated in the drawings and the dependent claims.
Fig. 1
shows a schematic representation of the structure of an apparatus according to the invention for an air-jet loom,
Fig. 2
a partial view of the embodiment of FIG. 1 on a larger scale,
Fig. 3
a partial view of a modified device,
Fig. 4
a partial view of a further modified device,
Fig. 5
a diagram of the course of a deflection force during the stretching of a registered weft thread and
Fig. 6
a view of the device of Figure 1 opposite to the weft transport direction.

Bei einer Luftdüsenwebmaschine, wie sie in Fig. 1 teilweise dargestellt ist, wird ein Schussfaden 10 von einer nicht dargestellten Vorratsspule mittels eines Vorspulgerätes 11 abgezogen und in mehreren Windungen auf eine Trommel dieses Vorspulgerätes aufgewickelt. Der Schussfaden 10 wird in zwei Hauptblasdüsen 12, 13 bereitgehalten. Zwischen dem Vorspulgerät 11 und den Hauptblasdüsen 12, 13 ist eine Fadenbremse 14 angeordnet. Der Schussfaden wird mittels der Hauptblasdüsen 12, 13 in ein Webfach eingeblasen, das im Bereich eines Webblattes 15 aus nicht dargestellten Kettfäden gebildet wird. Das Webblatt 15, das eine Vielzahl von in geringem Abstand nebeneinander angeordneten Lamellen besitzt, bildet einen Schussfadentransportkanal 16. Hierzu sind die Lamellen in bekannter Weise mit einer U-förmigen Aussparung versehen, die zu dem Warenrand des nicht dargestellten Gewebes offen ist. Der Transport des Schussfadens 10 in dem Schussfadentransportkanal 16 wird mittels Hilfsblasdüsen oder Stafettendüsen 17 unterstützt, die jeweils einen Blasluftstrom in den Schussfadentransportkanal 16 richten.In an air jet loom, as shown in Fig. 1 partially, a weft thread 10 is withdrawn from a supply spool, not shown by means of a Vorspulgerätes 11 and wound in several turns on a drum of this Vorspulgerätes. The weft thread 10 is held in two main blowing nozzles 12, 13. Between the Vorspulgerät 11 and the Hauptblasdüsen 12, 13 a yarn brake 14 is arranged. The weft thread is blown by means of the main blower nozzles 12, 13 in a shed, which is formed in the region of a reed 15 from warp threads, not shown. The reed 15, which has a plurality of closely spaced apart lamellae, forms a weft transport channel 16. For this purpose, the lamellae are provided in a known manner with a U-shaped recess which is open to the fabric edge of the fabric, not shown. The transport of the weft thread 10 in the weft transport channel 16 is supported by Hilfsblasdüsen or Stafettendüsen 17, each of which directs a blast of air in the weft transport channel 16.

Wenn ein Schussfaden 10 in das Webfach eingetragen wird, so wird ein Stift 18 an der Trommel des Vorspulgerätes 11 gelöst. Die Hauptblasdüsen 12, 13 werden mit Druckluft beaufschlagt. Ebenso werden die Stafettendüsen 17 gruppenweise nacheinander mit Druckluft beaufschlagt. Wenn der Schussfaden 10 die der Eintragsseite gegenüberliegende Seite des Webfachs erreicht, so wird dies von einem Schussfadendetektor 19 gemeldet. Bevor der Schussfaden 10 das gegenüberliegende Ende des Webfaches erreicht, wird er bereits mittels der Fadenbremse 14 abgebremst. Die Betätigung der Fadenbremse 14 wird mittels eines Detektors 20 gesteuert, der die Anzahl der Windungen an Schussfaden zählt, die von der Trommel des Vorspulgerätes 11 beim Eintragen des Schussfadens abgezogen werden. Das Eintragen der Schussfäden, d.h. das Öffnen des Fadenstoppers 18, das Einschalten der Druckluftbeaufschlagung der Hauptblasdüsen 12, 13, das Beaufschlagen der Stafettendüsen 17 werden in bekannter Weise über eine Steuereinrichtung 21 gesteuert, an welcher auch der Schussfadenwächter 19 angeschlossen ist, der die Ankunft eines Schussfadens auf der der Eintragsseite gegenüberliegenden Seite meldet.When a weft thread 10 is inserted into the shed, a pin 18 is released on the drum of the Vorspulgerätes 11. The Hauptblasdüsen 12, 13 are pressurized with compressed air. Likewise, the relay nozzles 17 are pressurized in groups one after the other with compressed air. If the weft thread 10 reaches the side of the shed opposite the entry side, this is signaled by a weft yarn detector 19. Before the weft thread 10 reaches the opposite end of the shed, it is already braked by means of the thread brake 14. The operation of the yarn brake 14 is controlled by means of a detector 20, which counts the number of turns of weft, which are deducted from the drum of the Vorspulgerätes 11 when entering the weft. The insertion of the weft threads, i. the opening of the thread stopper 18, the switching on of the compressed air to the Hauptblasdüsen 12, 13, the charging of the relay nozzles 17 are controlled in a known manner via a control device 21, to which also the weft detector 19 is connected, the arrival of a weft thread on the entry side opposite Page reports.

Schussfäden bestehen üblicherweise aus einem relativ elastischen Material. Aufgrund der hohen Arbeitsgeschwindigkeiten werden sie beim Eintragen in ein Webfach und insbesondere beim Abbremsen am Ende des Schusseintrages elastisch gedehnt. Diese elastische Dehnung ist Ursache dafür, dass ein eingetragener Schussfaden die Tendenz hat, in das Innere des Webfachs, bzw. in das Innere des Schussfadentransportkanals 16 zurückzuspringen. Er bildet dann in diesem Bereich Schlaufen, die zu einem Webfehler führen.Weft threads usually consist of a relatively elastic material. Due to the high working speeds they are elastically stretched when entering into a shed and in particular when braking at the end of the weft insertion. This elastic elongation is the reason why a registered weft thread has the tendency to jump back into the interior of the shed, or into the interior of the weft transport channel 16. He then forms in this area loops, which lead to a weaving error.

Um dieses Zurückspringen zu verhindern und um den Schussfaden so zu halten, dass er in gestreckter Form an den Warenrand mit Hilfe des Webblattes 15 angeschlagen wird, ist eine Fadenklemme 22 vorgesehen, die den eingetragenen Schussfaden 10 auf der der Eintragsseite gegenüberliegenden Seite eines Webfaches ergreift und klemmt. Da nicht sichergestellt ist, dass der eingetragene Schussfaden rechtzeitig ergriffen wird, d.h. wenn er noch (ausreichend) gestreckt ist, ist auf der der Eintragsseite gegenüberliegenden Seite des Webfaches der Fadenklemme 22 noch eine Einrichtung 23 vorgeschaltet, mit welcher der Schussfaden 10 ausgelenkt und damit gespannt wird. Die Fadenklemme 22 und die Einrichtung 23 sind so gestaltet und angeordnet, dass sie das Eintragen eines Schussfadens nicht behindern. Ihre einzelnen Elemente, die später noch erläutert werden, sind in Verlängerung und außerhalb der Kontur des Schussfadentransportkanals 16 angeordnet. Sie werden von der Steuereinrichtung 21 so betätigt, dass sie auf den Schussfaden 10 einwirken, wenn dieser eingetragen ist, und dass sie ihn rechtzeitig freigeben, wenn sich die Weblade mit dem Webblatt nach dem Anschlagen des Schussfadens an den Warenrand zurückbewegt. Dadurch ist es möglich, den Schussfaden 10 über die gesamte Breite des Webfaches unter weitgehend gleichmässiger Spannung zu halten, so dass eine hohe Gewebequalität erzielt wird.To prevent this jumping back and to keep the weft thread so that it is struck in stretched form to the edge of the fabric by means of the reed 15, a thread clamp 22 is provided which engages the registered weft thread 10 on the entry side opposite side of a shed and stuck. Since it is not ensured that the inserted weft thread is grasped in time, i. if it is still (sufficiently) stretched, on the side opposite the entry side of the shed the thread clamp 22 is preceded by a device 23 with which the weft thread 10 is deflected and thus tensioned. The thread clamp 22 and the device 23 are designed and arranged so that they do not hinder the entry of a weft thread. Their individual elements, which will be explained later, are arranged in extension and outside the contour of the weft transport channel 16. They are operated by the control device 21 so that they act on the weft thread 10 when it is registered, and that they release it in time when the sley with the reed after striking the weft thread moves back to the edge of the fabric. As a result, it is possible to keep the weft thread 10 under largely uniform tension over the entire width of the shed, so that a high quality of the fabric is achieved.

Die Steuereinrichtung 21 bildet ein Betätigungssignal für die Fadenklemme 22 und die Einrichtung 23 in Abhängigkeit von der detektierten Bewegung des Schussfadens 10 beim Eintragen. Um eine ausreichende Zeitspanne für die Betätigung des Fadenklemme 22 und der Einrichtung 23 zu haben, wird die Bewegung des Schussfadens 10 auf der Eintragsseite detektiert. Bei dem Ausführungsbeispiel geschieht das mittels des Detektors 20, der die während des Schussfadeneintrags von der Trommel des Vorspulgerätes 11 abgezogenen Windungen zählt. Bevorzugt bildet die Steuereinrichtung 21 das Betätigungssignal für die Fadenklemme 22 und die Einrichtung 23 in Abhängigkeit von dem Signal, das der vorletzten abgezogenen Windung entspricht. Der Beginn und das Ende des Betätigens der Fadenbremse 22 und der Einrichtung 23 ist über die Steuereinrichtung 21 einstellbar, um eine Anpassung an das Material der Schussfäden und / oder die Art der Gewebebindung vorzunehmen.The control device 21 forms an actuating signal for the thread clamp 22 and the device 23 as a function of the detected movement of the weft thread 10 during entry. In order to have a sufficient time for the operation of the thread clamp 22 and the device 23, the movement of the weft thread 10 is detected on the entry side. In the embodiment, this is done by means of the detector 20, which counts the withdrawn during the weft insertion of the drum of the Vorspulgerätes 11 turns. Preferably, the control device 21 forms the actuating signal for the thread clamp 22 and the device 23 in response to the signal, the the penultimate withdrawn turn corresponds. The beginning and the end of the operation of the yarn brake 22 and the device 23 can be adjusted via the control device 21 in order to adapt to the material of the weft threads and / or the type of fabric weave.

Bei dem Ausführungsbeispiel nach Fig. 1 und 2 sind als Betätigungsvorrichtungen für die Fadenklemme 22 und die Einrichtung 23 pneumatische Kolben-Zylindereinheiten 24, 25 vorgesehen, die sehr kurze Schaltzeiten haben, da zwischen dem Anfang und Ende des Betätigens nur relativ kurze Zeitspannen zur Verfügung stehen, die in der Größenordnung von 20 ms liegen. Die Kolben-Zylindereinheiten 24, 25 des Ausführungsbeispiels sind in beiden Richtungen mit Druckluft angetrieben, so dass keine Rückstellfedern vorhanden sind.In the embodiment of FIGS. 1 and 2 are provided as actuators for the thread clamp 22 and the device 23 pneumatic piston-cylinder units 24, 25, which have very short switching times, since between the beginning and end of pressing only relatively short periods of time are available which are on the order of 20 ms. The piston-cylinder units 24, 25 of the embodiment are driven in both directions with compressed air, so that no return springs are present.

Der Anfang und das Ende des Betätigens der Fadenklemme 22 und der Einrichtung 23 wird von der Steuereinrichtung 21 bestimmt, die über Magnetventile 26, 27 die Druckluftversorgung zu den Kolben-Zylindereinheiten 24, 25 steuert. Die Magnetventile 26, 27 sind bevorzugt 5/3-Wege-Ventile.The beginning and end of the operation of the thread clamp 22 and the device 23 is determined by the control device 21, which controls the compressed air supply to the piston-cylinder units 24, 25 via solenoid valves 26, 27. The solenoid valves 26, 27 are preferably 5/3-way valves.

Als Druckluftquelle dient ein Druckluftreservoir oder Drucklufttank 28, in dem Druckluft mit relativ hohem Druck gespeichert wird, beispielsweise 6 bar. Die Kolben-Zylindereinheit 24 der Fadenklemme 22 wird direkt mit dem hohen Druck über das Ventil 26 versorgt, so dass für die Fadenklemme 22 sehr kurze Schaltzeiten erreichbar sind. Die Kolben-Zylindereinheit 25 der Einrichtung 23 zum Auslenken wird dagegen mit einem variierbaren Druck beaufschlagt. Dabei wird ein Druckverlauf angestrebt, wie er beispielsweise in Fig. 5 dargestellt ist. Zu Beginn der Betätigung wird die Kolben-Zylindereinheit 25 der Einrichtung 23 mit einem hohen Druck beaufschlagt, um die Bewegung möglichst schnell auszulösen. Danach wird der Druck auf einen geringeren Wert reduziert, so dass die Kraft reduziert ist, mit welcher der Schussfaden 10 gespannt gehalten wird. Gegebenenfalls wird dann gegen Ende des Betätigens noch einmal eine Druckerhöhung vorgenommen. Bei dem Ausführungsbeispiel nach Fig. 1 wird der in Fig. 5 dargestellte Druckverlauf dadurch erreicht, dass dem Magnetventil 27 ein Drosselventil 29 und ein kleines Reservoir 30 vorgeschaltet sind. Solange das Magnetventil 27 die Leitung in Ausfahrrichtung zu der Kolben-Zylindereinheit 25 sperrt, baut sich in dem kleinen Reservoir 30 ein Druck auf, der im wesentlichen den Druck in dem Drucklufttank 28 entspricht. Stellt das Magnetventil 27 in Ausfahrrichtung die Verbindung zu der Kolben-Zylindereinheit 25 her, so wird diese kurzzeitig mit dem vollen Druck beaufschlagt, bis das Reservoir 30 soweit geleert ist, dass es mit dem von dem Drosselventil 29 gedrosselten Druck nachgefüllt wird. Dadurch ergibt sich der in Fig. 5 mit de durchgezogenen Linie dargestellte Druckverlauf, d.h. die Betätigung beginnt mit einer Druckspitze, wonach sich der Druck auf den gedrosselten Wert reduziert. Die Drosselung des Drosselventils 29 ist vorzugsweise über eine Eingabeeinrichtung und die Steuereinrichtung 21 einstellbar, um eine Anpassung an unterschiedliche Materialien der Schussfäden und / oder auch an unterschiedliche Gewebebindungen vorzunehmen. Die Drosselstellung des Drosselventils 29 kann auch während des Webens verstellt, gesteuert oder geregelt werden.As compressed air source is a compressed air reservoir or compressed air tank 28, is stored in the compressed air at a relatively high pressure, for example 6 bar. The piston-cylinder unit 24 of the thread clamp 22 is supplied directly with the high pressure via the valve 26, so that for the thread clamp 22 very short switching times can be achieved. The piston-cylinder unit 25 of the device 23 for deflecting, however, is subjected to a variable pressure. In this case, a pressure curve is sought, as shown for example in Fig. 5. At the beginning of the operation, the piston-cylinder unit 25 of the device 23 is subjected to a high pressure in order to trigger the movement as quickly as possible. After that, the pressure is reduced to a lower value, so that the force is reduced, with which the weft thread 10 is kept taut. If necessary, an increase in pressure is then made again towards the end of the actuation. In the embodiment of FIG. 1, the pressure profile shown in Fig. 5 is achieved in that the solenoid valve 27, a throttle valve 29 and a small reservoir 30 are connected upstream. As long as the solenoid valve 27 blocks the line in the extension direction to the piston-cylinder unit 25, a pressure builds up in the small reservoir 30, which essentially corresponds to the pressure in the compressed-air tank 28. If the solenoid valve 27 in the extension direction the connection to the piston-cylinder unit 25 ago, so this is briefly applied to the full pressure until the reservoir 30 is emptied so far that it is refilled with the throttled by the throttle valve 29 pressure. This results in the pressure curve shown in Fig. 5 with de solid line, ie the operation begins with a pressure peak, after which the pressure is reduced to the throttled value. The throttling of the throttle valve 29 is preferably adjustable via an input device and the control device 21 in order to adapt to different materials of the weft threads and / or also to different weave bindings. The throttle position of the throttle valve 29 can also be adjusted, controlled or regulated during weaving.

Wenn die in Fig. 5 gestrichelt gezeigte zweite Druckspitze gegen Ende der Betätigung der Einrichtung 23 gewünscht wird, d.h. eine erhöhte Auslenkkraft, so wird das gemäß dem Ausführungsbeispiel nach Fig. 1 dadurch erreicht, dass die Steuereinrichtung 21 mittels eines Elektromagnetventils 31 der Kolben-Zylindereinheit 25 eine zweite Druckluftzufuhr zuschaltet. Dem als Absperrventil ausgebildeten Elektromagnetventil 31 ist ein einstellbares Drosselventil 32 vorgeschaltet, das auf einen höheren Druckwert als das Drosselventil 29 eingestellt ist. Das Betätigen des Magnetventils 31 kann von der Steuereinrichtung 21 einer vorgegebenen Einstellung einer Zeitspanne oder einer Winkelposition der Hauptwelle der Webmaschine erfolgen. Bei dem Ausführungsbeispiel nach Fig. 1 und 2 ist jedoch vorgesehen, dass ein Positionsdetektor 33 dem Kolben der Kolben-Zylindereinheit 25 der Einrichtung 23 zugeordnet ist, der abhängig von der Position des Kolbens oder in einer vorbestimmten Position ein Signal gibt, das die zweite Druckspitze veranlasst.If the second pressure peak shown in dashed lines in FIG. 5 is desired towards the end of actuation of the device 23, ie an increased deflection force, this is achieved according to the embodiment of FIG. 1 in that the control device 21 is actuated by means of a solenoid valve 31 of the piston-cylinder unit 25 connects a second compressed air supply. The designed as shut-off valve solenoid valve 31 is preceded by an adjustable throttle valve 32, which is set to a higher pressure value than the throttle valve 29. The actuation of the solenoid valve 31 may by the controller 21 a predetermined setting of a time period or an angular position of the Main shaft of the loom done. In the embodiment of FIGS. 1 and 2, however, it is provided that a position detector 33 is associated with the piston of the piston-cylinder unit 25 of the device 23, which outputs a signal depending on the position of the piston or in a predetermined position, the second pressure peak causes.

Der Anfang und das Ende des Betätigens der Fadenklemme 22 und der Einrichtung 23 kann in vorgegebenen Zeitspannen nach dem Signal des Detektors 20 erfolgen. Bevorzugt wird jedoch der Anfang und das Ende des Betätigens auch in Abhängigkeit von den Winkelpositionen α der Hauptwelle der Webmaschine bestimmt, da auch die Bewegung der Weblade und damit des Webblattes 15 diesen Winkelpositionen zugeordnet ist. Um das Betätigen einzustellen, kann auch die Zeitspanne berücksichtigt werden, die zwischen der Ankunft des Schussfadens bei dem Schussfadenwächter 19 und dem Signal des Detektors 20 liegt.The beginning and the end of the actuation of the thread clamp 22 and the device 23 can take place in predetermined periods of time after the signal of the detector 20. Preferably, however, the beginning and the end of the pressing is also determined in dependence on the angular positions α of the main shaft of the loom, since the movement of the sley and thus of the reed 15 is associated with these angular positions. In order to adjust the actuation, the time span between the arrival of the weft thread at the weft detector 19 and the signal from the detector 20 can also be taken into account.

Die Elemente der Fadenklemme 22 und der Einrichtung 23 sind auf der Weblade der Webmaschine angeordnet, die das Webblatt 15 trägt. Die Anordnung ist dabei so vorgenommen, dass alle Elemente in der Ruhestellung außerhalb der Kontur des Schussfadentransportkanals liegen, wie das aus Figur 6 zu erkennen ist. Wie aus Fig. 2 zu ersehen ist, befindet sich ein stationäres Klemmteil 34 oberhalb des Schussfadentransportkanals 16. Die Kolben-Zylindereinheit 24 ist soweit unterhalb des Schussfadentransportkanals angeordnet, dass das äußerste Ende des Kolbens 35 in der Ruhestellung sich unterhalb des Schussfadentransportkanals 16 befindet. Die Kolben-Zylindereinheit 25 ist ebenfalls derart unterhalb des Schussfadentransportkanals 16 angeordnet, dass sich der Kolben 36 in der Ruhestellung vollständig unterhalb des Schussfadentransportkanals 16 befindet. Zu der Einrichtung 23 gehören zwei Umlenkelemente 37, 38, die oberhalb des Schussfadentransportkanals 16 angeordnet sind. Der Kolben 36 ist mitsamt dem Schussfaden 10 in den Bereich zwischen den beiden Umlenkelementen 37, 38 hineinbewegbar, und nimmt den Schussfaden 10 mit. Der Auslenkweg des Schussfadens 10 entspricht daher dem doppelten des Weges des Kolbens 36.The elements of the thread clamp 22 and the device 23 are arranged on the batten of the loom, which carries the reed 15. The arrangement is made so that all elements are in the rest position outside the contour of the weft transport channel, as can be seen from Figure 6. As can be seen from Fig. 2, there is a stationary clamping member 34 above the weft transport channel 16. The piston-cylinder unit 24 is arranged below the weft transport channel so far that the outermost end of the piston 35 is in the rest position below the weft transport channel 16. The piston-cylinder unit 25 is likewise arranged below the weft transport channel 16 such that the piston 36 is completely below the weft transport channel 16 in the rest position. The device 23 includes two deflecting elements 37, 38, which are arranged above the weft transport channel 16. The piston 36, together with the weft thread 10, can be moved into the region between the two deflection elements 37, 38, and takes the weft 10 with. The deflection path of the weft thread 10 therefore corresponds to twice the travel of the piston 36.

Wie in Fig. 2 weiter dargestellt ist, kann der Fadenklemme 22 ein weiterer Schussfadenwächter 39 nachgeordnet werden. Des weiteren kann am Ende des Schussfadentransportkanals 16 noch eine Streckdüse 40 angeordnet sein, die aus einer unterhalb des Schussfadentransportkanals 16 angeordneten Blasöffnung einen Druckluftstrahl zusammen mit dem Ende des Schussfadens in einen lotrecht zu dem Schussfadentransportkanal 16 verlaufendes, oberhalb des Schussfadentransportkanal 16 angeordnetes Rohr einbläst. Bei einer abgewandelten Ausführungsform sind das Rohr und die Blasöffnung schräg oder parallel zum Schussfadentransportkanal 16 ausgerichtet.As further illustrated in FIG. 2, the thread clamp 22 can be followed by another weft guard 39. Furthermore, at the end of the weft transport channel 16 still a stretching nozzle 40 may be arranged, which blows from a arranged below the weft transport channel 16 blowing a compressed air jet together with the end of the weft thread in a perpendicular to the weft transport channel 16 extending above the weft transport channel 16 arranged pipe. In a modified embodiment, the tube and the blow opening are aligned obliquely or parallel to the weft transport channel 16.

Wenn ein größerer Auslenkweg benötigt wird, um den Schussfaden ausreichend auszulenken und zu spannen, können zwei Einrichtungen 23 und 23' zum Auslenken des Schussfadens hintereinander angeordnet werden. Die Einrichtung 23' besitzt dann ebenfalls eine Kolben-Zylindereinheit 25', deren Kolben zwischen zwei stationären Umlenkelementen 37 und 37' nach oben bewegbar ist. Eine zweite Einrichtung 23' zum Auslenken eines eingetragenen Schussfadens kann auch dann sinnvoll sein, wenn die Webmaschine sehr schnell läuft und Schussfäden aus sehr unterschiedlichem Material hintereinander eingetragen werden müssen. In diesem Fall müsste die Kolben-Zylindereinheit 25' mit einem eigenen Magnetventil und einer eigenen Druckversorgungsleitung ausgerüstet sein, die unabhängig von der Steuereinrichtung 21 ansteuerbar ist.If a larger Auslenkweg is required to deflect the weft sufficient and tension, two means 23 and 23 'for deflecting the weft thread can be arranged one behind the other. The device 23 'then also has a piston-cylinder unit 25', the piston between two stationary deflecting elements 37 and 37 'is movable upwards. A second device 23 'for deflecting a registered weft thread can also be useful if the loom is running very fast and weft threads must be entered from very different material in a row. In this case, the piston-cylinder unit 25 'would have to be equipped with its own solenoid valve and its own pressure supply line, which can be controlled independently of the control device 21.

Wenn es nur darum geht, einen möglichst großen Weg für die Auslenkung vorzusehen, so kann die Einrichtung 23" gemäß Fig. 4 vorgesehen werden. Bei dieser Einrichtung 23" ist die Kolben-Zylindereinheit 25" mit einem gabelförmigen Kolben 41 versehen, dessen beide Zinken zwischen die Umlenkelemente 37', 37 und 38 hineinbewegbar sind.If only the aim is to provide the greatest possible path for the deflection, the device 23 "can be provided as shown in Fig. 4. In this device 23", the piston-cylinder unit 25 "is with a fork-shaped piston 41 is provided, the two prongs between the deflecting elements 37 ', 37 and 38 are hineinbewegbar.

Anstelle der pneumatischen Kolben-Zylindereinheit 24, deren Kräfte gut einstellbar sind, sind auch andere Betätigungselemente für die Fadenklemme 22 einsetzbar. Für die Fadenklemme 22 kann auch ein elektromagnetischer Antrieb vorgesehen werden.Instead of the pneumatic piston-cylinder unit 24, whose forces are well adjustable, other actuators for the thread clamp 22 are used. For the thread clamp 22 and an electromagnetic drive can be provided.

Um die Bewegung der Kolben-Zylindereinheiten 24, 25 zu beschleunigen ist es möglich, die jeweils als Rückführteitung dienende Leitung mittels der Magnetventile 26, 27 nicht mit der Atmosphäre zu verbinden sondern an eine Absaugung anzuschließen.In order to accelerate the movement of the piston-cylinder units 24, 25, it is possible not to connect the respectively serving as a return line by means of the solenoid valves 26, 27 with the atmosphere but to connect to an exhaust.

Die erfindungsgemäße Vorrichtung gestattet es auch, das Beheben eines Schussfadenbruches, beispielsweise nach der DE 37 30 480 , ohne Behinderung durchzuführen. Für dieses Beheben eines Schussfadenbruches wird die Vorrichtung nicht betätigt, so dass alle Elemente sich in einer Position befinden, in welcher sich ein Schussfaden frei durch den Schussfadentransportkanal 16 bewegen kann.The device according to the invention also makes it possible to remedy a weft breakage, for example after DE 37 30 480 without obstruction. For this remedy of a weft break, the device is not actuated, so that all elements are in a position in which a weft thread is free to move through the weft transport channel 16.

Um zu erreichen, dass die Schussfäden mit gleichen Längen außerhalb des Gewebes enden, wird eine Schussfadenschere unmittelbar nach dem Schussfadenwächter 19 vorgesehen.In order to achieve that the weft threads end with equal lengths outside the fabric, a weft scissors is provided immediately after the weft guard 19.

Bei den bisher geschilderten Ausführungsbeispielen ist die Einrichtung 23, 23' oder 23" jeweils auf der der Eintragsseite gewandten Seite des Webfaches angeordnet worden, d.h. auf der dem Vorspulgerät 11 abgewandten Seite. Es ist jedoch auch möglich, eine Einrichtung zum Auslenken auf der Eintragsseite anzuordnen. Hierzu kann auch die auf der Eintragsseite vorhandene Fadenbremse 14 eingesetzt werden, die so gesteuert wird, dass sie nach dem Betätigen der Fadenklemme 22 den eingetragenen Schussfaden auslenkt. Die Fadenbremse hat ein verstellbares Umlenkelement 42, dass zwischen zwei stationäre Umlenkelemente 43 hineinbewegbar ist.In the exemplary embodiments described so far, the device 23, 23 'or 23 "has been arranged in each case on the side of the shed facing the entry side, ie on the side facing away from the pre-pulser 11. However, it is also possible to arrange a device for deflecting on the entry side To this end, it is also possible to use the thread brake 14 present on the entry side, which is controlled in such a way that it deflects the inserted weft thread after the thread clamp 22 has been actuated The thread brake has an adjustable deflection element 42 which can be moved in between two stationary deflection elements 43.

Wenn zwei Gewebebahnen nebeneinander auf der gleichen Webmaschine gewoben werden, so kann eine Einrichtung zum Auslenken zwischen beiden Gewebe angeordnet werden. Die Einrichtung zum Auslenken kann im Prinzip an beliebiger Stelle zwischen dem Fadenstopper 18 und der Fadenklemme 22 angeordnet werden.When two fabric webs are woven side by side on the same loom, a means for deflecting between both fabrics can be arranged. The means for deflecting can be arranged at any point between the thread stopper 18 and the thread clamp 22 in principle.

Es können auch mehrere Einrichtungen zum Auslenken des Schussfadens eingesetzt werden, beispielsweise die in Figur 1 dargestellte Einrichtung 23 und die ebenfalls in Figur 1 dargestellte Fadenbremse 14 als Einrichtung zum Auslenken. Mittels mehrerer Einrichtungen zum Auslenken ist es möglich, innerhalb sehr kurzer Zeit auch größere Fadenlängen aufzunehmen.It is also possible to use a plurality of devices for deflecting the weft thread, for example the device 23 shown in FIG. 1 and the thread brake 14 likewise shown in FIG. 1 as a device for deflecting. By means of several means for deflecting it is possible to record within a very short time and larger thread lengths.

Claims (21)

  1. Device for stretching a weft thread (10) inserted into a weaving shed, in particular for air-jet weaving machines, wherein a thread clamp (22) that can be actuated by means of a control unit (21) to clamp the weft thread (10) is provided, upstream from which - viewed in the weft thread transport direction - a device (14, 23, 23', 23") that can be actuated by a control unit (21) is provided for deflecting the weft thread (10), characterised in that the device (23, 23', 23") for deflecting comprises at least one pneumatic piston-cylinder device (25, 25', 25") as its actuation device.
  2. Device according to claim 1, characterised in that the thread clamp (22) and the device (23, 23', 23") are arranged next to each other on the same side.
  3. Device according to claim 1 or 2, characterised in that at least one device (20) for detecting the movement of a weft thread (10) is provided, whose signal is converted into actuation signals for the thread clamp (22) and the device (14, 23, 23', 23") for deflecting.
  4. Device according to claim 3, characterised in that the device for detecting the movement of the weft thread (10) is a detector (20) of a pre-winder (11), which detects the number of windings of the weft thread (10) drawn off at a weft insertion.
  5. Device according to any of claims 1 to 4, characterised in that the size of the deflection force exerted by the device (14, 23, 23', 23") for deflecting the weft thread (10) is adjustable, controllable or can be regulated.
  6. Device according to any of claims 1 to 5, characterised in that the variation of the deflection force exerted by the device (14, 23, 23', 23") for deflecting the weft thread is adjustable or can be regulated.
  7. Device according to any of claims 1 to 6, characterised in that two or more devices (14, 23, 23', 23") for deflecting are provided between a weft thread stopper (18) and the thread clamp (22).
  8. Device according to any of claims 1 to 7, characterised in that at least two devices (14, 23, 23') for deflecting the weft thread are provided, which can be actuated independently of one other.
  9. Device according to any of claims 1 to 8, characterised in that the beginning and/or the end of the actuation of the thread clamp (22) are variable.
  10. Device according to any of claims 1 to 9, characterised in that the beginning and/or the end of the actuation of the device (14, 23, 23', 23") for deflecting the weft thread (10) are variable.
  11. Device according to any of claims 1 to 10, characterised in that the thread clamp (22) and the device (14, 23, 23' 23") for deflecting the weft thread are arranged on a sley of the weaving machine.
  12. Device according to claim 11, characterised in that the sley carries a reed (15) having a weft thread guide duct (16) and that the thread clamp (22) and the device (14, 23, 23', 23") for deflecting are arranged on an extension of the weft thread guide duct.
  13. Device according to claim 12, characterised in that the elements (36, 37, 38, 36', 37', 42, 43) of the device (14, 23, 23', 23") for deflecting and the elements (34, 35) of the thread clamp (22) are arranged, in their rest position, outside the contour of the weft thread transport duct (16).
  14. Device according to any of claims 1 to 13, characterised in that the piston (36, 36', 41) of the piston-cylinder unit (25, 25', 25") can be driven in both directions with compressed air.
  15. Device according to any of claims 1 to 14, characterised in that a device (33) for detecting the position of the piston (36) of the piston-cylinder unit (25) of the device (23) for deflecting is provided.
  16. Device according to any of claims 1 to 15, characterised in that means are provided for determining the level of the pressure and/or the variation over time of the pressure that is delivered to the piston-cylinder unit (25, 25', 25") of the device (23, 23', 23") for deflecting.
  17. Device according to any of claims 1 to 16, characterised in that the piston-cylinder unit (25) of the device (23) for deflecting can be connected selectively via a switching valve (31) to at least two delivery lines for compressed air.
  18. Device according to any of claims 1 to 17, characterised in that a pneumatic piston-cylinder unit (24) is provided as actuating device for the thread clamp (22).
  19. Device according to claim 18, characterised in that the piston (35) of the piston-cylinder unit (24) can be driven in both directions with compressed air.
  20. Method for stretching a weft thread after its insertion into a weaving shed of a weaving machine, in particular an air-jet weaving machine, wherein the weft thread is clamped at least approximately at the end of the insertion on the side opposite to an insertion side and then held in tension by deflection until it is beaten up,
    characterised in that the weft thread is deflected by a piston-cylinder unit (25, 25', 25") which can be controlled or regulated.
  21. Method according to claim 20, characterised in that the weft thread is deflected at a plurality of locations.
EP03789093A 2002-12-20 2003-11-27 Device and method for stretching Expired - Lifetime EP1576219B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10261774 2002-12-20
DE10261774A DE10261774A1 (en) 2002-12-20 2002-12-20 Stretching device and method
PCT/EP2003/013338 WO2004059055A1 (en) 2002-12-20 2003-11-27 Device and method for stretching

Publications (2)

Publication Number Publication Date
EP1576219A1 EP1576219A1 (en) 2005-09-21
EP1576219B1 true EP1576219B1 (en) 2007-09-12

Family

ID=32404387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03789093A Expired - Lifetime EP1576219B1 (en) 2002-12-20 2003-11-27 Device and method for stretching

Country Status (9)

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US (1) US7559344B2 (en)
EP (1) EP1576219B1 (en)
JP (1) JP4805580B2 (en)
CN (1) CN1729330B (en)
AT (1) ATE373126T1 (en)
AU (1) AU2003293732A1 (en)
DE (2) DE10261774A1 (en)
ES (1) ES2293073T3 (en)
WO (1) WO2004059055A1 (en)

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EP2440696B1 (en) 2009-06-10 2016-01-06 Picanol Gripper unit, control system for a gripper unit and weaving machine

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JP5555409B2 (en) * 2008-02-29 2014-07-23 株式会社豊田自動織機 Weft insertion control device in jet loom
JP5689827B2 (en) * 2011-02-01 2015-03-25 株式会社豊田中央研究所 Weft tension applying device
CN102634916B (en) * 2012-04-06 2013-09-18 经纬纺织机械股份有限公司 First weft yarn stretching device
CN106592069B (en) * 2016-12-30 2018-07-06 吴江市兴业纺织有限公司 A kind of air-jet loom

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Publication number Priority date Publication date Assignee Title
EP2440696B1 (en) 2009-06-10 2016-01-06 Picanol Gripper unit, control system for a gripper unit and weaving machine
EP2440696B2 (en) † 2009-06-10 2018-12-26 Picanol Gripper unit, control system for a gripper unit and weaving machine

Also Published As

Publication number Publication date
US20060151047A1 (en) 2006-07-13
DE50308198D1 (en) 2007-10-25
DE10261774A1 (en) 2004-07-01
JP2006510820A (en) 2006-03-30
CN1729330B (en) 2011-07-06
ATE373126T1 (en) 2007-09-15
ES2293073T3 (en) 2008-03-16
WO2004059055A1 (en) 2004-07-15
AU2003293732A1 (en) 2004-07-22
JP4805580B2 (en) 2011-11-02
CN1729330A (en) 2006-02-01
EP1576219A1 (en) 2005-09-21
US7559344B2 (en) 2009-07-14

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