EP0853692A1 - Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom - Google Patents

Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom

Info

Publication number
EP0853692A1
EP0853692A1 EP96934506A EP96934506A EP0853692A1 EP 0853692 A1 EP0853692 A1 EP 0853692A1 EP 96934506 A EP96934506 A EP 96934506A EP 96934506 A EP96934506 A EP 96934506A EP 0853692 A1 EP0853692 A1 EP 0853692A1
Authority
EP
European Patent Office
Prior art keywords
channel
wear
resistant
branch
duct
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
EP96934506A
Other languages
German (de)
French (fr)
Other versions
EP0853692B1 (en
Inventor
Jean-Marie Bamelis
Chris Delanote
Jozef Peeters
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.)
Picanol NV
Original Assignee
Picanol NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Picanol NV filed Critical Picanol NV
Publication of EP0853692A1 publication Critical patent/EP0853692A1/en
Application granted granted Critical
Publication of EP0853692B1 publication Critical patent/EP0853692B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • D03D47/28—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

Definitions

  • the invention relates to a device for stretching a inserted weft thread, in particular for an air jet weaving machine, which has a channel adjoining a weft insertion channel of a weaving reed, into which a blowing nozzle opens which essentially branches perpendicularly from this channel, at least one deflection point is directed for the branch channel having the weft thread.
  • a device for stretching the inserted weft thread is arranged at the end of the weft insertion channel, which is formed from a plurality of lamellae of the reed, in order to prevent the weft thread from jumping back after the insertion.
  • Such devices have a channel which extends in a straight line in the extension of the weft insertion channel and into which a blowing nozzle opens which is directed to a branch channel which branches off essentially perpendicularly to this channel.
  • a branch channel which branches off essentially perpendicularly to this channel.
  • At the entrance of this channel which can also be returned to the channel by a curved path (EP 0 493 847 AI), there is a deflection point.
  • the invention has for its object to improve a device of the type mentioned.
  • the at least one deflection point is formed from a wear-resistant element which is arranged essentially transversely to the direction of insertion of the weft thread.
  • the invention is based on the consideration that the deflecting points or deflecting points are subject to wear due to the weft thread running over them, so that after a certain operating time the effect of the device changes and, if appropriate, also that of the device ⁇ fend and held in this weft thread can be damaged.
  • the wear-resistant element or elements at the deflection point (s) ensure that a constant function is guaranteed over a longer operating time, while on the other hand the risk is reduced that the device damages the weft threads.
  • the branch duct has a curved course and re-opens into the duct, two wear-resistant elements, each forming a deflection point for the weft thread, being arranged at the entrance of the branch duct.
  • the friction of the weft thread at the deflection points and the applied pneumatic forces counteract a springing back of the weft thread, whereby the existing conditions remain constant even over a longer operating time, since the deflection points are designed as wear-resistant elements and thus not subject to significant wear even after a long period of operation.
  • FIG. 1 shows a partial view of an air jet weaving machine with a section through a stretching device according to the invention
  • Fig. 2 shows a cross section through the stretching device approximately along the line II-II of Fig. 1 and
  • FIG. 3 shows an enlarged section F3 of FIG. 1.
  • the device 1 for stretching is attached to a sley 2 together with a reed 3.
  • the reed 3 consists of a plurality of lamellae which form a U-shaped weft insertion channel 4 which is open on one side.
  • the stretching device 1 has a housing-like body which is provided with a channel 5 directly adjoining the weft insertion channel 4 of the reed 3, which also has a U-shaped cross section which essentially corresponds to the weft insertion channel 4 and in the entry direction A runs in the extension of the weft insertion channel 4.
  • a branching channel 6 branches off from the channel 5, the first section of which is directed approximately perpendicular to the channel 5 away from the sley 2 and then merges with an approximately cylindrical curvature into a second section which closes leads back to channel 5.
  • a blowing nozzle 8 is directed toward the inlet opening of the branch duct 6 and opens into the underside 13 of the duct 5 facing the sley 2 and slightly offset from the entry duct 4. Because of this offset arrangement, the blowing of the incoming weft thread into the branch duct 6 is facilitated.
  • the branch duct 6 is separated from the duct 5 by means of a thread guide element which has an overall cross-section which is approximately pear-shaped or drop-shaped in the thread running direction.
  • the thread guide element has on the side of the entrance of the branch duct 6 a wear- Stes element 7, which has a cylindrical shape and forms an apex deflection for a weft 14.
  • a wear-resistant element 11 is located at the outlet of the branch duct 6 on the side facing the duct 5.
  • the support element 12 is designed such that it is set back relative to the weft thread 14 guided by the wear-resistant elements 7 and 11. The support element therefore does not touch the weft thread and therefore cannot lead to damage, even if there were burrs.
  • the two wear-resistant elements 7 and 10 run essentially transversely to the blowing direction of the blowing nozzle 8 and have curved outer surfaces.
  • a further blowing nozzle 9 is located approximately above the apex line of the wear-resistant element, which enables the weft thread 14 to wrap at an angle of approximately 90 °.
  • the blowing nozzle 9 runs essentially in the direction of the second section of the branch duct 6 which leads back to channel 5.
  • the air flow emerging from the blowing nozzle 9 ensures that the weft thread 14 lies securely against the wear-resistant element 7 and also against the wear-resistant element 11.
  • the blowing nozzle 8 has two or more small blowing openings from which compressed air is blown out with well-directed jets, the blowing nozzle 9 only has a larger blowing opening.
  • a further wear-resistant element 10 is arranged in the region of the front edge of the entrance to the branch duct 6, which element is oriented essentially transversely to the entry direction A of the weft thread 14 and a first deflection point forms for the weft.
  • the dimensions, ie the diameter, of this element tes 10 is relatively small in order to bring the entrance to the branch duct 6 as close as possible to the weft insertion duct 4.
  • the wear-resistant element 7 has a cross-section which corresponds essentially to the cross-section of the branch duct 6, so that the thread lies against the wear-resistant element 7 along a relatively large distance.
  • the wear-resistant elements 7 and 11 and the support element 12 consist of a component which then has a pear-shaped or teardrop-shaped cross section.
  • a connector 20 is attached to the housing-like body of the device 1, to which a compressed air supply line can be attached. From this connection piece lead-in channels 15, 16 and 17 lead into the blow nozzles 8 and 9.
  • the body can be produced, for example, by injection molding, the shape of the channel 5 and the branch channel 6 and the blow nozzles 8 and 9 and the supply channels 15, 16 and 17 are molded during injection molding. In another solution, only the outer shape of the body is cast, while the channel 5 and the branch channel 6 are produced by milling.
  • the supply ducts 15, 16 and 17 and the blowing nozzles 8, 9 are then realized through bores, the supply ducts 16 and 17 being closed by means of sealing plugs 18 and 19.
  • the wear-resistant elements 7, 10 and 11, which form deflection points for a weft thread 14, have rounded contact surfaces for the weft thread. They are preferably cylindrical bodies that are easy to manufacture and assemble. Since they are wear-resistant, they are subject to relatively little wear, so that the risk of damage to the thread end of a weft thread 14 is reduced.
  • the wear-resistant elements 7, 10 and 11 are designed as ceramic bodies. With an their embodiment they are metal or plastic basic elements, which are provided with a wear-resistant coating.
  • a detector 21 is arranged in the extension of the channel 5 at the outlet end thereof, into which a weft thread 14 is blown.
  • this detector 21 which is also attached to the sley 2, it is possible, for example, to detect a weft 14 that is too long.
  • the device for stretching the weft which is blown in a known manner by means of main blowing nozzles and relay nozzles through the weft insertion channel 4 of the reed 3, the weft 14 is first deflected by the blowing nozzle 8 around the wear-resistant element 7 and then by the further blowing nozzle 9 deflected around the wear-resistant element 7.
  • a jumping back of the weft thread 14 after the weft insertion is prevented due to the effect of the air flow blown out of the blowing nozzles 8 and 9 and due to the friction of the weft thread 14 in particular on the wear-resistant element 7 and also on the wear-resistant element 10.

Landscapes

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

Abstract

In a device for drafting an inserted weft yarn (14), in particular for an air nozzle mechanical loom, a channel (5) into which an air blowing nozzle opens follows a weft inserting channel (4) of a weaving reed (3). The air blowing nozzle is oriented towards a branching channel that branches off from said channel (5) in a substantially perpendicular direction. At least one deflecting point for the weft yarn (14) is formed by a wear-resistant element (7, 10, 11) arranged transversely to the insertion direction (A) of the weft yarn.

Description

Vorrichtung zum Strecken eines eingetragenen Schußfadens, insbesondere für eine Luftdüsenwebmaschine Device for stretching a inserted weft thread, in particular for an air jet weaving machine
Die Erfindung betrifft eine Vorrichtung zum Strecken eines eingetragenen Schußfadens, insbesondere für eine Luftdüsen¬ webmaschine, die einen an einen Schußeintragskanal eines Web¬ blattes anschließenden Kanal aufweist, in den eine Blasdüse mündet, die auf einen im wesentlichen lotrecht von diesem Ka¬ nal abzweigenden, wenigstens eine Umlenkstelle für den Schu߬ faden aufweisenden Abzweigkanal gerichtet ist.The invention relates to a device for stretching a inserted weft thread, in particular for an air jet weaving machine, which has a channel adjoining a weft insertion channel of a weaving reed, into which a blowing nozzle opens which essentially branches perpendicularly from this channel, at least one deflection point is directed for the branch channel having the weft thread.
Bei Luftdüsenwebmaschinen wird am Ende des Schußeintragska¬ nals, der aus einer Vielzahl von Lamellen des Webblattes ge¬ bildet wird, eine Vorrichtung zum Strecken des eingetragenen Schußfadens angeordnet, um nach dem Eintragen ein Zurück¬ springen des Schußfadens zu vermeiden. Derartige Vorrichtun¬ gen besitzen einen geradlinig in Verlängerung des Schußein¬ tragskanals verlaufenden Kanal, in den eine Blasdüse mündet, die auf einen im wesentlichen lotrecht zu diesem Kanal ab¬ zweigenden Abzweigkanal gerichtet ist. Am Eingang dieses Ka¬ nals, der auch auf gekrümmtem Wege zu dem Kanal wieder zu¬ rückgeführt werden kann (EP 0 493 847 AI) , besteht eine Um¬ lenkstelle. Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art zu verbessern.In air jet looms, a device for stretching the inserted weft thread is arranged at the end of the weft insertion channel, which is formed from a plurality of lamellae of the reed, in order to prevent the weft thread from jumping back after the insertion. Such devices have a channel which extends in a straight line in the extension of the weft insertion channel and into which a blowing nozzle opens which is directed to a branch channel which branches off essentially perpendicularly to this channel. At the entrance of this channel, which can also be returned to the channel by a curved path (EP 0 493 847 AI), there is a deflection point. The invention has for its object to improve a device of the type mentioned.
Diese Aufgabe wird dadurch gelöst, daß die wenigstens eine Umlenkstelle aus einem verschleißfesten Element gebildet ist, das im wesentlichen quer zur Eintragsrichtung des Schußfadens angeordnet ist.This object is achieved in that the at least one deflection point is formed from a wear-resistant element which is arranged essentially transversely to the direction of insertion of the weft thread.
Die Erfindung geht von der Überlegung aus, daß die Umlenk¬ stelle oder Umlenkstellen einem Verschleiß aufgrund des dar¬ über laufenden Schußfadens unterliegen, so daß nach einer ge¬ wissen Betriebszeit sich die Wirkung der Vorrichtung verän¬ dert und auch gegebenenfalls der in die Vorrichtung einlau¬ fende und in dieser gehaltene Schußfaden beschädigt werden kann. Aufgrund des oder der verschleißfesten Elemente an der oder den Umlenkstellen wird sichergestellt, daß eine gleich¬ bleibende Funktion über eine längere Betriebszeit gewährlei¬ stet ist, während andererseits die Gefahr verringert ist, daß die Vorrichtung die Schußfäden beschädigt .The invention is based on the consideration that the deflecting points or deflecting points are subject to wear due to the weft thread running over them, so that after a certain operating time the effect of the device changes and, if appropriate, also that of the device ¬ fend and held in this weft thread can be damaged. The wear-resistant element or elements at the deflection point (s) ensure that a constant function is guaranteed over a longer operating time, while on the other hand the risk is reduced that the device damages the weft threads.
Bei einer bevorzugten Ausführungsform weist der Abzweigkanal einen gekrümmten Verlauf auf und mündet wieder in den Kanal ein, wobei am Eingang des Abzweigkanals zwei jeweils eine Um¬ lenkstelle für den Schußfaden bildende, verschleißfeste Ele¬ mente angeordnet sind. Bei dieser Ausführungsform wirken die Reibung des Schußfadens an den Umlenkstellen und die aufge¬ brachten pneumatischen Kräfte einem Zurückspringen des Schu߬ fadens entgegen, wobei die dabei vorhandenen Verhältnisse auch über eine längere Betriebszeit gleichbleiben, da die Um¬ lenkstellen als verschleißfeste Elemente ausgebildet sind und somit auch nach einer längeren Betriebszeit keinem wesentli¬ chen Verschleiß unterliegen.In a preferred embodiment, the branch duct has a curved course and re-opens into the duct, two wear-resistant elements, each forming a deflection point for the weft thread, being arranged at the entrance of the branch duct. In this embodiment, the friction of the weft thread at the deflection points and the applied pneumatic forces counteract a springing back of the weft thread, whereby the existing conditions remain constant even over a longer operating time, since the deflection points are designed as wear-resistant elements and thus not subject to significant wear even after a long period of operation.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung des in der Zeichnung schema¬ tisch dargestellten Ausführungsbeispiels. O 97/13017 PC17EP96/04282Further advantages and features of the invention result from the following description of the exemplary embodiment shown schematically in the drawing. O 97/13017 PC17EP96 / 04282
Fig. 1 zeigt eine Teilansicht einer Luftdüsenwebmaschine mit einem Schnitt durch eine erfindungsgemäße Streckvor¬ richtung,1 shows a partial view of an air jet weaving machine with a section through a stretching device according to the invention,
Fig. 2 zeigt einen Querschnitt durch die Streckvorrichtung in etwa entlang der Linie II-II der Fig. 1 undFig. 2 shows a cross section through the stretching device approximately along the line II-II of Fig. 1 and
Fig. 3 einen vergrößerten Ausschnitt F3 der Fig. 1.3 shows an enlarged section F3 of FIG. 1.
Die Vorrichtung 1 zum Strecken ist auf einer Weblade 2 zusam¬ men mit einem Webblatt 3 angebracht. Das Webblatt 3 besteht aus einer Vielzahl von Lamellen, die einen einseitig offenen U-förmigen Schußeintragskanal 4 bilden.The device 1 for stretching is attached to a sley 2 together with a reed 3. The reed 3 consists of a plurality of lamellae which form a U-shaped weft insertion channel 4 which is open on one side.
Die Streckvorrichtung 1 besitzt einen gehäuseartigen Körper, der mit einem unmittelbar an den Schußeintragskanal 4 des Webblattes 3 anschließenden Kanal 5 versehen ist, der eben¬ falls einen U-förmigen, im wesentlichen dem Schußeintragska¬ nal 4 entsprechenden Querschnitt aufweist und in Eintrags¬ richtung A in Verlängerung des Schußeintragskanals 4 ver¬ läuft.The stretching device 1 has a housing-like body which is provided with a channel 5 directly adjoining the weft insertion channel 4 of the reed 3, which also has a U-shaped cross section which essentially corresponds to the weft insertion channel 4 and in the entry direction A runs in the extension of the weft insertion channel 4.
Unmittelbar nach dem Eingang des Kanals 5 zweigt ein Abzweig¬ kanal 6 von dem Kanal 5 ab, dessen erster Abschnitt annähernd lotrecht zu dem Kanal 5 hinweg von der Weblade 2 gerichtet ist und dann mit einer etwa zylindrischen Krümmung in einen zweiten Abschnitt übergeht, der zu dem Kanal 5 zurückführt. Auf die Eingangsöffnung des Abzweigkanals 6 ist eine Blasdüse 8 gerichtet, die in der der Weblade 2 zugewandten, gegenüber dem Eintragskanal 4 etwas abgesetzten Unterseite 13 des Ka¬ nals 5 mündet. Aufgrund dieser abgesetzten Anordnung wird das Einblasen des ankommenden Schußfadens in den Abzweigkanal 6 erleichtert. Der Abzweigkanal 6 ist von dem Kanal 5 mittels eines Fadenführungselementes abgetrennt, das in Fadenlauf¬ richtung einen etwa birnenförmigen oder tropfenförmigen Ge¬ samtquerschnitt aufweist. Das Fadenführungselement besitzt an der Seite des Eingangs des Abzweigkanals 6 ein verschleißte- stes Element 7, das eine zylindrische Gestalt aufweist und eine Scheitelumlenkung für einen Schußfaden 14 bildet. An dieses im wesentlichen quer zur Eintragsrichtung A des Schu߬ fadens 14 angeordnete verschleißfeste Element 7 schließt ein Stützelement 12 an, das Bestandteil des gehäuseartigen Kör¬ pers oder ein gesondertes Bauteil sein kann. Ein verschlei߬ festes Element 11 befindet sich am Ausgang des Abzweigkanals 6 auf der dem Kanal 5 zugewandten Seite. Das Stützelement 12 ist so ausgebildet, daß es gegenüber dem von den verschlei߬ festen Elementen 7 und 11 geführten Schußfaden 14 zurückge¬ setzt ist. Das Stützelement berührt deshalb den Schußfaden nicht und kann deshalb nicht zu einer Schädigung führen, selbst wenn ein Grat vorhanden wäre. Die beiden verschleißfe¬ sten Elemente 7 und 10 verlaufen im wesentlichen quer zur Blasrichtung der Blasdüse 8 und besitzen gewölbte Mantelflä¬ chen.Immediately after the entrance of the channel 5, a branching channel 6 branches off from the channel 5, the first section of which is directed approximately perpendicular to the channel 5 away from the sley 2 and then merges with an approximately cylindrical curvature into a second section which closes leads back to channel 5. A blowing nozzle 8 is directed toward the inlet opening of the branch duct 6 and opens into the underside 13 of the duct 5 facing the sley 2 and slightly offset from the entry duct 4. Because of this offset arrangement, the blowing of the incoming weft thread into the branch duct 6 is facilitated. The branch duct 6 is separated from the duct 5 by means of a thread guide element which has an overall cross-section which is approximately pear-shaped or drop-shaped in the thread running direction. The thread guide element has on the side of the entrance of the branch duct 6 a wear- Stes element 7, which has a cylindrical shape and forms an apex deflection for a weft 14. This wear-resistant element 7, which is arranged essentially transversely to the entry direction A of the weft thread 14, is adjoined by a support element 12, which can be part of the housing-like body or a separate component. A wear-resistant element 11 is located at the outlet of the branch duct 6 on the side facing the duct 5. The support element 12 is designed such that it is set back relative to the weft thread 14 guided by the wear-resistant elements 7 and 11. The support element therefore does not touch the weft thread and therefore cannot lead to damage, even if there were burrs. The two wear-resistant elements 7 and 10 run essentially transversely to the blowing direction of the blowing nozzle 8 and have curved outer surfaces.
In etwa oberhalb der Scheitellinie des verschleißfesten Ele¬ mentes, das für den Schußfaden 14 eine Umschlingung in einem Winkel von annähernd 90° ermöglicht, befindet sich eine wei¬ tere Blasdüse 9. Die Blasdüse 9 verläuft im wesentlichen in Richtung des zweiten Abschnittes des Abzweigkanales 6, der zu dem Kanal 5 zurückführt. Der aus der Blasdüse 9 austretende Luftstrom sorgt dafür, daß sich der Schußfaden 14 sicher an das verschleißfeste Element 7 und auch an das verschleißfeste Element 11 anlegt. Während die Blasdüse 8 zwei oder mehrere kleine Blasδffnungen aufweist, aus denen Druckluft mit gut ausgerichteten Strahlen ausgeblasen wird, besitzt die Blasdü¬ se 9 nur eine größere Blasöffnung.A further blowing nozzle 9 is located approximately above the apex line of the wear-resistant element, which enables the weft thread 14 to wrap at an angle of approximately 90 °. The blowing nozzle 9 runs essentially in the direction of the second section of the branch duct 6 which leads back to channel 5. The air flow emerging from the blowing nozzle 9 ensures that the weft thread 14 lies securely against the wear-resistant element 7 and also against the wear-resistant element 11. While the blowing nozzle 8 has two or more small blowing openings from which compressed air is blown out with well-directed jets, the blowing nozzle 9 only has a larger blowing opening.
Wie insbesondere aus Fig. 3 zu ersehen ist, ist im Bereich der Vorderkante des Eingangs zu dem Abzweigkanal 6 ein weite¬ res verschleißfestes Element 10 angeordnet, das im wesentli¬ chen quer zur Eintragsrichtung A des Schußfadens 14 ausge¬ richtet ist und eine erste Umlenkstelle für den Schußfaden bildet. Die Abmessungen, d.h. der Durchmesser, dieses Elemen- tes 10 ist relativ klein, um den Eingang zu dem Abzweigkanal 6 möglichst dicht an den Schußeintragskanal 4 heranzubringen.As can be seen in particular from FIG. 3, a further wear-resistant element 10 is arranged in the region of the front edge of the entrance to the branch duct 6, which element is oriented essentially transversely to the entry direction A of the weft thread 14 and a first deflection point forms for the weft. The dimensions, ie the diameter, of this element tes 10 is relatively small in order to bring the entrance to the branch duct 6 as close as possible to the weft insertion duct 4.
Das verschleißfeste Element 7 besitzt einen Querschnitt, der im wesentlichen dem Querschnitt des Abzweigkanals 6 ent¬ spricht, so daß sich der Faden entlang einer relativ großen Strecke an dem verschleißfesten Element 7 anlegt. In Abwand¬ lung des dargestellten Ausführungsbeispiels wird vorgesehen, daß die verschleißfesten Elemente 7 und 11 sowie das Stütz- element 12 aus einem Bauteil bestehen, das dann einen birnen¬ förmigen oder tropfenförmigen Querschnitt aufweist.The wear-resistant element 7 has a cross-section which corresponds essentially to the cross-section of the branch duct 6, so that the thread lies against the wear-resistant element 7 along a relatively large distance. In a modification of the exemplary embodiment shown, it is provided that the wear-resistant elements 7 and 11 and the support element 12 consist of a component which then has a pear-shaped or teardrop-shaped cross section.
Wie aus Fig. 2 zu erkennen ist, ist an dem gehäuseartigen Körper der Vorrichtung 1 ein Anschlußstück 20 angebracht, an welchem eine Druckluftzuführleitung befestigbar ist. Von die¬ sem Anschlußstück führen in den Körper eingearbeitete Zulei¬ tungskanäle 15, 16 und 17 zu den Blasdüsen 8 und 9. Der Kör¬ per kann beispielsweise im Spritzgußverfahren hergestellt werden, wobei die Form des Kanals 5 und des Abzweigkanals 6 sowie der Blasdüsen 8 und 9 und der Zuleitungskanäle 15, 16 und 17 beim Spritzgießen geformt werden. Bei einer anderen Lösung wird nur die Außenform des Körpers gegossen, während der Kanal 5 und der Abzweigkanal 6 durch Fräsen hergestellt werden. Die Zuleitungskanäle 15, 16 und 17 sowie die Blasdü¬ sen 8, 9 werden dann durch Bohrungen verwirklicht, wobei die Zuleitungskanäle 16 und 17 mittels Dichtungsstopfen 18 und 19 verschlossen werden.As can be seen from Fig. 2, a connector 20 is attached to the housing-like body of the device 1, to which a compressed air supply line can be attached. From this connection piece lead-in channels 15, 16 and 17 lead into the blow nozzles 8 and 9. The body can be produced, for example, by injection molding, the shape of the channel 5 and the branch channel 6 and the blow nozzles 8 and 9 and the supply channels 15, 16 and 17 are molded during injection molding. In another solution, only the outer shape of the body is cast, while the channel 5 and the branch channel 6 are produced by milling. The supply ducts 15, 16 and 17 and the blowing nozzles 8, 9 are then realized through bores, the supply ducts 16 and 17 being closed by means of sealing plugs 18 and 19.
Die verschleißfesten Elemente 7, 10 und 11, die Umlenkpunkte für einen Schußfaden 14 bilden, weisen für den Schußfaden ge¬ rundete Anlageflächen auf. Vorzugsweise sind sie zylindrische Körper, die einfach herzustellen und zu montieren sind. Da sie verschleißfest sind, unterliegen sie einem relativ gerin¬ gen Verschleiß, so daß die Gefahr einer Beschädigung des Fa¬ denendes eines Schußfadens 14 verrringert ist . Die ver¬ schleißfesten Elemente 7, 10 und 11 sind bei einer ersten Ausführungsform als Keramikkörper ausgebildet. Bei einer an- deren Ausführungsform sind sie Metall- oder Kunststoffgrund- elemente, die mit einer verschleißfesten Beschichtung verse¬ hen sind.The wear-resistant elements 7, 10 and 11, which form deflection points for a weft thread 14, have rounded contact surfaces for the weft thread. They are preferably cylindrical bodies that are easy to manufacture and assemble. Since they are wear-resistant, they are subject to relatively little wear, so that the risk of damage to the thread end of a weft thread 14 is reduced. In a first embodiment, the wear-resistant elements 7, 10 and 11 are designed as ceramic bodies. With an their embodiment they are metal or plastic basic elements, which are provided with a wear-resistant coating.
Wie aus Fig. 1 zu erkennen ist, ist in Verlängerung des Ka¬ nals 5 an dessen Austrittsende ein Detektor 21 angeordnet, in den ein Schußfaden 14 eingeblasen wird. Mittels dieses Detek¬ tors 21, der ebenfalls an der Weblade 2 befestigt ist, ist es beispielsweise möglich, einen zu langen Schußfaden 14 zu er¬ kennen.As can be seen from FIG. 1, a detector 21 is arranged in the extension of the channel 5 at the outlet end thereof, into which a weft thread 14 is blown. By means of this detector 21, which is also attached to the sley 2, it is possible, for example, to detect a weft 14 that is too long.
Die Vorrichtung zum Strecken des Schußfadens, der in bekann¬ ter Weise mittels Hauptblasdüsen und Stafettendüsen durch den Schußeintragskanal 4 des Webblattes 3 hindurchgeblasen wird, wird zunächst der Schußfaden 14 durch die Blasdüse 8 um das verschleißfeste Element 7 umgelenkt und danach von der weite¬ ren Blasdüse 9 um das verschleißfeste Element 7 umgelenkt. Ein Zurückspringen des Schußfadens 14 nach dem Schußeintrag wird aufgrund der Wirkung der aus den Blasdüsen 8 und 9 aus¬ geblasenen Luftströmung und aufgrund der Reibung des Schußfa¬ dens 14 insbesondere an dem verschleißfesten Element 7 und auch an dem verschleißfesten Element 10 verhindert.The device for stretching the weft, which is blown in a known manner by means of main blowing nozzles and relay nozzles through the weft insertion channel 4 of the reed 3, the weft 14 is first deflected by the blowing nozzle 8 around the wear-resistant element 7 and then by the further blowing nozzle 9 deflected around the wear-resistant element 7. A jumping back of the weft thread 14 after the weft insertion is prevented due to the effect of the air flow blown out of the blowing nozzles 8 and 9 and due to the friction of the weft thread 14 in particular on the wear-resistant element 7 and also on the wear-resistant element 10.
Der Schutzbereich der erfindungsgemäßen Vorrichtung ist nicht auf das Ausführungsbeispiel beschränkt, sondern wird vielmehr durch die beigefügten Patentansprüche bestimmt. Insbesondere sind Abwandlungen in der Form und/oder der Anordnung der ver¬ schleißfesten Elemente 7, 10 und 11 sowie in der Ausgestal¬ tung des Abzweigkanals 6 möglich. The scope of protection of the device according to the invention is not limited to the exemplary embodiment, but rather is determined by the appended claims. In particular, modifications are possible in the shape and / or the arrangement of the wear-resistant elements 7, 10 and 11 and in the configuration of the branch duct 6.

Claims

Patentansprüche claims
1. Vorrichtung zum Strecken eines eingetragenen Schußfa¬ dens (14) , insbesondere für eine Luftdüsenwebmaschine, die einen an einen Schußeintragskanal (4) eines Web¬ blattes (3) anschließenden Kanal (5) aufweist, in den eine Blasdüse (8) mündet, die auf einen im wesentlichen lotrecht von diesem Kanal (5) abzweigenden, wenigstens eine Umlenkstelle für den Schußfaden aufweisenden Ab¬ zweigkanal (6) gerichtet ist, dadurch gekennzeichnet, daß die wenigstens eine Umlenkstelle aus einem ver¬ schleißfesten Element (7, 10, 11) gebildet ist, das im wesentlichen quer zur Eintragsrichtung (A) des Schußfa¬ dens (14) angeordnet ist.1. Device for stretching a inserted weft thread (14), in particular for an air jet loom, which has a channel (5) adjoining a weft insertion channel (4) of a reed (3), into which a blowing nozzle (8) opens, which is directed to an at least one deflection point for the weft thread branching branch channel (6) which branches off essentially perpendicularly from this channel (5), characterized in that the at least one deflection point consists of a wear-resistant element (7, 10, 11 ) is formed, which is arranged essentially transversely to the entry direction (A) of the weft thread (14).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Abzweigkanal (6) einen gekrümmten Verlauf hat und wieder in den Kanal (5) einmündet, und daß am Ein¬ gang des Abzweigkanals (6) jeweils eine Umlenkstelle für den Schußfaden (14) bildende, verschleißfeste Ele¬ mente (7, 10) angeordnet sind.2. Apparatus according to claim 1, characterized in that the branch duct (6) has a curved course and re-opens into the duct (5), and that at the entrance of the branch duct (6) each have a deflection point for the weft thread (14) forming, wear-resistant elements (7, 10) are arranged.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekenn¬ zeichnet, daß die dem Kanal (5) zugewandte Wandung des Abzweigkanals (6) aus einem Fadenführungselement gebil¬ det wird, das ein am Eingang und/oder Ausgang des Ab¬ zweigkanals (6) angeordnetes verschleißfestes Element (7, 11) enthält.3. Apparatus according to claim 1 or 2, characterized gekenn¬ characterized in that the channel (5) facing the wall of the branch channel (6) is formed from a thread guide element which is an at the entrance and / or exit of the branch channel (6 ) arranged wear-resistant element (7, 11) contains.
4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekenn¬ zeichnet, daß dem Eingang des Abzweigkanals (6) zuge¬ ordnete, verschleißfeste Element des Fadenführungsele¬ mentes eine Scheitelführung für den Schußfaden (14) bildet. Vorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß das Fadenführungselement ein den Kanal (5) und den Abzweigkanal (6) trennendes Stütz¬ element (12) enthält, das gegenüber den von den ver¬ schleißfesten Elementen (7, 11) gebildeten Umlenkstel¬ len zurückgesetzt ist.4. Apparatus according to claim 2 or 3, characterized gekenn¬ characterized in that the input of the branch channel (6) assigned, wear-resistant element of the thread guide element forms an apex guide for the weft thread (14). Device according to one of claims 2 to 4, characterized in that the thread guide element contains a supporting element (12) separating the channel (5) and the branching channel (6), which is opposite the wear-resistant elements (7, 11) formed Umlenkstel¬ len is reset.
Vorrichtung nach Anspruch 4 oder 5, dadurch gekenn¬ zeichnet, daß das die Scheitelführung bildende ver¬ schleißfeste Element (7) eine im wesentlichen zylindri¬ sche Gestalt aufweist und einen Querschnitt besitzt, der annähernd dem Querschnitt des Abzweigkanals (6) entspricht .Device according to Claim 4 or 5, characterized in that the wear-resistant element (7) forming the apex guide has an essentially cylindrical shape and has a cross section which approximately corresponds to the cross section of the branch duct (6).
Vorrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß in dem Abzweigkanal (6) in etwa über einer Scheitellinie des verschleißfesten Elementes (7) eine weitere Blasdüse (9) mündet, deren Blasrich¬ tung im wesentlichen dem zu dem Kanal (5) zurückführen¬ den Abschnitt des Abzweigkanals (6) entspricht.Device according to one of claims 2 to 6, characterized in that a further blowing nozzle (9) opens into the branch duct (6) approximately above a apex line of the wear-resistant element (7), the blowing direction of which essentially corresponds to that of the duct (5 ) return the section of the branch duct (6) corresponds.
Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Kanal (5) und der AbzweigkanalDevice according to one of claims 1 to 7, characterized in that the channel (5) and the branch channel
(6) in einen gehäuseartigen Körper eingearbeitet sind, der mit einem Druckluftanschluß (20) versehen ist, von welchem in den Körper eingearbeitete Verbindungskanäle(6) are worked into a housing-like body which is provided with a compressed air connection (20), from which connecting channels are worked into the body
(15, 16, 17) zu den Blasdüsen (8, 9) führen.(15, 16, 17) lead to the blow nozzles (8, 9).
Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das oder die verschleißfesten Ele¬ mente (7, 10, 11) , die vorzugsweise eine wenigstens an¬ nähernd zylindrische Gestalt aufweisen, aus einem Kera¬ mikmaterial bestehen. 10. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das oder die verschleißfesten Ele¬ mente (7, 10, 11) , die vorzugsweise eine wenigstens an¬ nähernd zylindrische Gestalt aufweisen, mit einer ver¬ schleißfesten Außenschicht versehen sind. Device according to one of claims 1 to 8, characterized in that the or the wear-resistant elements (7, 10, 11), which preferably have an at least approximately cylindrical shape, consist of a ceramic material. 10. Device according to one of claims 1 to 8, characterized in that the or the wear-resistant elements (7, 10, 11), which preferably have an at least approximately cylindrical shape, are provided with a wear-resistant outer layer.
EP96934506A 1995-10-02 1996-10-01 Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom Expired - Lifetime EP0853692B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9500814 1995-10-02
BE9500814A BE1009619A6 (en) 1995-10-02 1995-10-02 STRETCHER FOR WEAVING MACHINES.
PCT/EP1996/004282 WO1997013017A1 (en) 1995-10-02 1996-10-01 Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom

Publications (2)

Publication Number Publication Date
EP0853692A1 true EP0853692A1 (en) 1998-07-22
EP0853692B1 EP0853692B1 (en) 2002-05-02

Family

ID=3889211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96934506A Expired - Lifetime EP0853692B1 (en) 1995-10-02 1996-10-01 Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom

Country Status (6)

Country Link
US (1) US6014990A (en)
EP (1) EP0853692B1 (en)
JP (1) JP4070237B2 (en)
BE (1) BE1009619A6 (en)
DE (1) DE59609162D1 (en)
WO (1) WO1997013017A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19802254C1 (en) * 1998-01-22 1999-08-05 Dornier Gmbh Lindauer Weft stretching and detection device for jet weaving machines, in particular with pneumatic weft insertion
DE20107885U1 (en) * 2001-05-10 2001-10-11 Dornier Gmbh Lindauer Holding device for the ends of weft threads in an air jet loom
DE50300789D1 (en) * 2002-04-26 2005-08-25 Sultex Ag Rueti Catching and holding device for the fishing-side weft end in a loom
DE10261774A1 (en) * 2002-12-20 2004-07-01 Picanol N.V. Stretching device and method
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread

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BE1000989A3 (en) * 1987-10-09 1989-05-30 Picanol Nv Device for stretching weft thread on weaving machines - has U=shaped reed section with device at one side contg. S=shaped duct with blower pipe producing air current
EP0342135A1 (en) * 1988-05-10 1989-11-15 S.A. Saurer Diederichs Weft suction and retaining device for weaving machines using jet weft inserting
US4976292A (en) * 1988-06-27 1990-12-11 Tagawa Kikai Co., Ltd. Weft end tensioning and detecting devices for shuttleless loom
FR2643657B1 (en) * 1989-02-20 1994-08-12 Toyoda Automatic Loom Works THREE-DIMENSIONAL FABRIC AND METHOD FOR THE PRODUCTION THEREOF
BE1005230A3 (en) * 1991-01-04 1993-06-01 Picanol Nv Device for seeking an impact on wire looms.
DE4311918A1 (en) * 1993-04-10 1994-10-13 Kloecker Entwicklungs Gmbh A device downstream of the reed, for braking a weft thread inserted by means of an air stream
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Also Published As

Publication number Publication date
DE59609162D1 (en) 2002-06-06
US6014990A (en) 2000-01-18
JP4070237B2 (en) 2008-04-02
EP0853692B1 (en) 2002-05-02
WO1997013017A1 (en) 1997-04-10
JPH11512790A (en) 1999-11-02
BE1009619A6 (en) 1997-06-03

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