WO2003102282A1 - Method for holding taut a weft thread and a loom for carrying out said method - Google Patents

Method for holding taut a weft thread and a loom for carrying out said method Download PDF

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Publication number
WO2003102282A1
WO2003102282A1 PCT/DE2003/001434 DE0301434W WO03102282A1 WO 2003102282 A1 WO2003102282 A1 WO 2003102282A1 DE 0301434 W DE0301434 W DE 0301434W WO 03102282 A1 WO03102282 A1 WO 03102282A1
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WO
WIPO (PCT)
Prior art keywords
mixing tube
weft thread
air flow
center axis
longitudinal center
Prior art date
Application number
PCT/DE2003/001434
Other languages
German (de)
French (fr)
Inventor
Peter D. Dornier
Adnan Wahhoud
Original Assignee
Lindauer Dornier Gesellschaft Mbh
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 Lindauer Dornier Gesellschaft Mbh filed Critical Lindauer Dornier Gesellschaft Mbh
Priority to EP03735272A priority Critical patent/EP1509645A1/en
Priority to BR0304920-5A priority patent/BR0304920A/en
Priority to JP2004509150A priority patent/JP2005528535A/en
Priority to US10/516,555 priority patent/US20050236062A1/en
Publication of WO2003102282A1 publication Critical patent/WO2003102282A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—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
    • D03D47/3026—Air supply systems
    • D03D47/3053—Arrangements or lay out of air supply systems
    • 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
    • D03D47/3006—Construction of the nozzles
    • D03D47/3013—Main nozzles

Definitions

  • the invention relates to a method for keeping a weft thread in the mixing tube of the main nozzle of an air jet weaving machine, according to which a length of the weft thread, which is preferably supplied by a prewinder, is acted upon in the mixing tube of the main nozzle by an air stream exerting a tensile force on the weft thread, which air flow is below is at a predetermined pressure level.
  • the invention further relates to an air jet weaving machine for carrying out the method with at least one pneumatically actuated weft thread insertion means having a mixing tube, with at least one controllable valve operatively connected to the weft thread insertion means via a pressure line for acting on the length section of a weft thread preferably supplied by a prewinder in the mixing tube with a predetermined pressure level of an air flow, with at least one pneumatic pressure source and with a programmable weaving machine control for controlling the at least one controllable valve.
  • the weft thread to be inserted into the shed is made available to the pneumatically acting weft thread insertion means, hereinafter referred to as the main nozzle, with a predetermined length on air jet looms.
  • a length section of the weft thread to be inserted into the shed is located in the mixing tube of the main nozzle, while a further length section of the weft thread is located between the main nozzle and the thread store and on the thread store itself and is held on the thread store by suitable means for the duration of at least one weaving cycle ,
  • the length section of the weft thread located in the mixing tube of the main nozzle is kept stretched with the aid of an air flow acting in the direction of the longitudinal center axis of the mixing tube.
  • the time to keep the weft thread stretched is usually increased by an amount that can span several weaving cycles.
  • the object is achieved in that a below a predetermined
  • Pressure level P2 standing air flow for a predetermined period of time at an angle that is greater than zero degrees to the longitudinal center axis of the mixing tube on the end portion of the length section of a weft thread held in the mixing tube of the main nozzle.
  • the predetermined period of time for the loading of the weft end area corresponds at least to the duration of a weaving cycle.
  • the duration of exposure to the weft end area is greater than a weaving cycle if, depending on the pattern, several main nozzles are used to produce a fabric.
  • the air flow acting on the weft end region is emitted at an angle to the longitudinal center axis of the mixing tube.
  • the front end of the weft thread is thus deflected from approximately the plane of the longitudinal center axis of the mixing tube.
  • the air flow acting on the weft end area thus holds the Weft stretched from the thread storage device to the deflection point in the mixing tube.
  • the structure of the weft thread is not affected by the so-called holding air.
  • the length of the deflected end of the weft thread is defined such that it can be cut off by the warp threads after the weft thread has been inserted into the shed and after it has tied.
  • the weft thread end area with its structure, which is changed by the holding air, for example, is therefore not part of the fabric produced.
  • the mixing tube of the main nozzle has a device in the region of its free end which deflects the front end of the weft thread from the plane of the longitudinal center axis of the mixing tube by means of an air stream.
  • the wall of the mixing tube e.g. perpendicular to the longitudinal center axis of the
  • the inlet channel is connected via a pressure line to a valve which can be controlled by the weaving machine control.
  • the device can consist of a separate connecting piece which is connected to the free end of the mixing tube or it can consist of a separate intermediate piece which is integrated into the mixing tube.
  • the connection piece or the intermediate piece has an inlet channel with an outlet and an inlet of an outlet channel arranged diametrically opposite the outlet of the inlet channel.
  • the center axis of the inlet and outlet channels is arranged transversely to the longitudinal center axis of the mixing tube.
  • the main nozzle 1 comprises the injector 3 which can be screwed into the mixing tube body 2 and the mixing tube 4 connected to the mixing tube body 2.
  • a device In the area of the free end of the mixing tube 4, a device is provided according to the invention which allows the front end 5a of a weft thread 5 to be deflected from approximately the plane of the longitudinal center axis 4a of the mixing tube 4 by means of an air stream in the direction of the vertically running longitudinal center axis 17 of the device.
  • the direction arrow symbolically represented as pressure line 8, shows the direction of flow of the air flow.
  • the device consists of an inlet channel 6, preferably penetrating the wall 4b of the mixing tube 4, and an inlet 7a of an outlet channel 7 arranged diametrically opposite the outlet 6a of the inlet channel 6.
  • the pressure P2 of the air flow supplied by a pressure source 10 is applied to a valve 9, which e.g. is an electromagnetically controlled valve.
  • the valve 9 is connected to the control electronics 11 of the loom via the control line 12 in a signal-transmitting manner.
  • a further valve 13 which is also connected to the control electronics 11 of the weaving machine in a signal-transmitting manner via the control line 14, the pressure P 1 of an air flow acting on the weft thread 5 impulsively via the pressure line 15 is present, which air flow is symbolically represented by an arrow. This air flow serves to insert the weft thread into the shed.

Abstract

The invention relates to a method for holding taut the weft thread (5) in the blending tube (4) of the main jet (1) of an air-jet loom and to an air-jet loom for carrying out said method. The aim of the invention is to eliminate the air stream that acts approximately over the entire length of the main jet (1) and has a detrimental effect on the structure of the weft thread (5) when the latter is idle in the main jet (1), whilst holding taut the weft thread (5) in said main jet (1). To achieve this, during the idle phase of the weft thread (5), the air stream only acts on the front end (5a) of the latter in the blending tube of the main jet.

Description

Verfahren zum Gestreckthalten eines Schussfadens und Webmaschine zur Weft thread stretching method and loom
VerfahrensdurchführungProcess implementation
Die Erfindung betrifft ein Verfahren zum Gestreckthalten eines Schussfadens im Mischrohr der Hauptdüse einer Luftdüsenwebmaschine, wonach ein Längenabschnitt des von vorzugsweise einem Vorspulgerät gelieferten Schussfadens während einer vorbestimmten Zeitdauer in dem Mischrohr der Hauptdüse durch einen eine Zugkraft auf den Schussfaden ausübenden Luftstrom beaufschlagt wird, welcher Luftstrom unter einem vorbestimmten Druckniveau steht.The invention relates to a method for keeping a weft thread in the mixing tube of the main nozzle of an air jet weaving machine, according to which a length of the weft thread, which is preferably supplied by a prewinder, is acted upon in the mixing tube of the main nozzle by an air stream exerting a tensile force on the weft thread, which air flow is below is at a predetermined pressure level.
Die Erfindung betrifft ferner eine Luftdüsenwebmaschine zur Durchführung des Verfahrens mit wenigstens einem ein Mischrohr aufweisendes, pneumatisch beaufschlagbares Schussfadeneintragsmittel, mit wenigstens ein mit dem Schussfadeneintragsmittel über eine Druckleitung wirkverbundenes, steuerbares Ventil zum Beaufschlagen des im Mischrohr gestreckt zu haltenden Längenabschnitts eines von vorzugsweise einem Vorspulgerät gelieferten Schussfadens mit einem vorbestimmten Druckniveau eines Luftstromes, mit wenigstens einer pneumatischen Druckquelle und mit einer speicherprogrammierbaren Webmaschinensteuerung zum Ansteuern des wenigstens einen steuerbaren Ventils.The invention further relates to an air jet weaving machine for carrying out the method with at least one pneumatically actuated weft thread insertion means having a mixing tube, with at least one controllable valve operatively connected to the weft thread insertion means via a pressure line for acting on the length section of a weft thread preferably supplied by a prewinder in the mixing tube with a predetermined pressure level of an air flow, with at least one pneumatic pressure source and with a programmable weaving machine control for controlling the at least one controllable valve.
Wie allgemein bekannt, wird auf Luftdüsenwebmaschinen der in das Webfach einzutragende Schussfaden von einem sogenannten Fadenspeicher bzw. Vorspulgerät dem pneumatisch wirkenden Schussfadeneintragsmittel, nachfolgend mit Hauptdüse bezeichnet, mit vorbestimmter Länge zur Verfügung gestellt.As is generally known, the weft thread to be inserted into the shed is made available to the pneumatically acting weft thread insertion means, hereinafter referred to as the main nozzle, with a predetermined length on air jet looms.
Ein Längenabschnitt des in das Webfach einzutragenden Schussfadens befindet sich in dem Mischrohr der Hauptdüse, während ein weiterer Längenabschnitt des Schussfadens sich zwischen der Hauptdüse und dem Fadenspeicher und auf dem Fadenspeicher selbst befindet und durch geeignete Mittel für die Zeitdauer wenigstens eines Webzyklus auf dem Fadenspeicher festgehalten wird. Der sich im Mischrohr der Hauptdüse befindende Längenabschnitt des Schussfadens wird mit Hilfe eines in Richtung der Längsmittenachse des Mischrohres wirkenden Luftstromes gestreckt gehalten.A length section of the weft thread to be inserted into the shed is located in the mixing tube of the main nozzle, while a further length section of the weft thread is located between the main nozzle and the thread store and on the thread store itself and is held on the thread store by suitable means for the duration of at least one weaving cycle , The length section of the weft thread located in the mixing tube of the main nozzle is kept stretched with the aid of an air flow acting in the direction of the longitudinal center axis of the mixing tube.
Sind zur Herstellung eines Gewebes mehrere Hauptdüsen im Einsatz, so verlängert sich die Zeit zum Gestreckthalten des Schussfadens in der Regel um einen Betrag, der mehrere Webzyklen umfassen kann.If several main nozzles are used to produce a fabric, the time to keep the weft thread stretched is usually increased by an amount that can span several weaving cycles.
Je nach der Struktur der Schussfäden kann das über eine längere Zeitdauer währende Gestreckthalten des Schussfadens zu Schäden führen, die insbesondere als Schussfadenbrüche auftreten, die als Veränderung der Fadenstruktur deutlich werden und die schließlich zu Entscheidungen führen, den Einsatzbereich der Luftdüsenwebmaschine zu beschränken.Depending on the structure of the weft threads, keeping the weft thread stretched over a longer period of time can lead to damage, which occurs in particular as weft thread breaks, which become apparent as a change in the thread structure and which ultimately lead to decisions to limit the area of use of the air jet weaving machine.
Die vorgenannten Nachteile zu vermeiden ist Aufgabe der Erfindung.The object of the invention is to avoid the aforementioned disadvantages.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass ein unter einem vorbestimmtenAccording to the invention the object is achieved in that a below a predetermined
Druckniveau P2 stehender Luftstrom während einer vorbestimmten Zeitdauer in einem Winkel, der größer als Null Grad ist, zur Längsmittenachse des Mischrohres auf den Endbereich des im Mischrohr der Hauptdüse gehaltenen Längenabschnitts eines Schussfadens abgegeben wird.Pressure level P2 standing air flow for a predetermined period of time at an angle that is greater than zero degrees to the longitudinal center axis of the mixing tube on the end portion of the length section of a weft thread held in the mixing tube of the main nozzle.
Die vorbestimmte Zeitdauer der Beaufschlagung des Schussfaden-Endbereiches entspricht dabei wenigstens der Dauer eines Webzyklus.The predetermined period of time for the loading of the weft end area corresponds at least to the duration of a weaving cycle.
Mit anderen Worten, die Dauer der Beaufschlagung des Schussfaden-Endbereiches ist dann größer als ein Webzyklus, wenn musterabhängig mehrere Hauptdüsen zur Herstellung eines Gewebes verwendet werden.In other words, the duration of exposure to the weft end area is greater than a weaving cycle if, depending on the pattern, several main nozzles are used to produce a fabric.
Erfindungswesentlich ist also, dass der auf den Schussfaden-Endbereich wirkende Luftstrom in einem Winkel zur Längsmittenachse des Mischrohres abgegeben wird. Damit wird das vordere Ende des Schussfadens aus etwa der Ebene der Längsmittenachse des Mischrohres abgelenkt. Der auf den Schussfaden-Endbereich wirkende Luftstrom hält so den Schussfaden vom Fadenspeicher bis zur Umlenkstelle im Mischrohr gestreckt. Bis zur Umlenkstelle im Mischrohr wird also die Struktur des Schussfadens durch die sogenannte Halteluft nicht beeinträchtigt. Der abgelenkte Schussfaden-Endbereich ist dabei in seiner Länge so festgelegt, dass dieser nach dem Eintragen des Schussfadens in das Webfach und nach dessen Abbinden durch die Kettfäden abgeschnitten werden kann. Der Schussfaden-Endbereich mit seiner etwa durch die Halteluft veränderten Struktur ist also nicht Bestandteil des hergestellten Gewebes.It is essential to the invention that the air flow acting on the weft end region is emitted at an angle to the longitudinal center axis of the mixing tube. The front end of the weft thread is thus deflected from approximately the plane of the longitudinal center axis of the mixing tube. The air flow acting on the weft end area thus holds the Weft stretched from the thread storage device to the deflection point in the mixing tube. Up to the deflection point in the mixing tube, the structure of the weft thread is not affected by the so-called holding air. The length of the deflected end of the weft thread is defined such that it can be cut off by the warp threads after the weft thread has been inserted into the shed and after it has tied. The weft thread end area with its structure, which is changed by the holding air, for example, is therefore not part of the fabric produced.
Zur Durchführung der Verfahrensmerkmale ist erfindungsgemäß vorgesehen, dass das Mischrohr der Hauptdüse im Bereich seines freien Endes eine Einrichtung aufweist, die das vordere Ende des Schussfadens aus der Ebene der Längsmittenachse des Mischrohres mittels eines Luftstromes ablenkt.To carry out the method features, it is provided according to the invention that the mixing tube of the main nozzle has a device in the region of its free end which deflects the front end of the weft thread from the plane of the longitudinal center axis of the mixing tube by means of an air stream.
Dazu ist ein die Wandung des Mischrohres, z.B. rechtwinklig zur Längsmittenachse desFor this purpose, the wall of the mixing tube, e.g. perpendicular to the longitudinal center axis of the
Mischrohres, durchdringender Einlasskanal mit Auslass und ein dem Auslass des Einlasskanals diametral gegenüberliegend angeordneter Einlass eines Auslasskanals vorgesehen. DerMixing tube, penetrating inlet duct with outlet and an inlet of an outlet duct arranged diametrically opposite the outlet of the inlet duct are provided. The
Einlasskanal steht über eine Druckleitung mit einem von der Webmaschinensteuerung ansteuerbaren Ventil in Verbindung.The inlet channel is connected via a pressure line to a valve which can be controlled by the weaving machine control.
Alternativ kann die Einrichtung aus einem separaten Anschlussstück bestehen, das mit dem freien Ende des Mischrohres verbunden ist oder sie kann aus einem separaten Zwischenstück bestehen, das in das Mischrohr eingebunden wird. Auch hier besitzt das Anschlussstück oder das Zwischenstück einen Einlasskanal mit Auslass und einen dem Auslass des Einlasskanals diametral gegenüberliegend angeordneten Einlass eines Auslasskanals.Alternatively, the device can consist of a separate connecting piece which is connected to the free end of the mixing tube or it can consist of a separate intermediate piece which is integrated into the mixing tube. Here, too, the connection piece or the intermediate piece has an inlet channel with an outlet and an inlet of an outlet channel arranged diametrically opposite the outlet of the inlet channel.
In einer bevorzugten Ausbildung der Einrichtung ist die Mittenachse des Ein- und Auslasskanals quer zur Längsmittenachse des Mischrohres angeordnet.In a preferred embodiment of the device, the center axis of the inlet and outlet channels is arranged transversely to the longitudinal center axis of the mixing tube.
Der mit der erfindungsgemäßen Lösung erreichte Vorteil besteht im Wesentlichen darin, dass die durch die Halteluft entstehenden strukturellen Veränderungen auf den Schussfaden-Endbereich begrenzt sind und dass ein solcher Endbereich nicht im hergestellten Gewebe enthalten ist. Die Erfindung wird nachstehend anhand eines Ausführungsbeispiel erläutert. Die anliegende Zeichnung zeigt in Figur 1 eine perspektivische Darstellung der Hauptdüse 1 einer Luftdüsenwebmaschine im Längsschnitt.The advantage achieved with the solution according to the invention essentially consists in the fact that the structural changes resulting from the holding air are limited to the weft thread end region and that such an end region is not contained in the fabric produced. The invention is explained below using an exemplary embodiment. The attached drawing shows in Figure 1 a perspective view of the main nozzle 1 of an air jet loom in longitudinal section.
Die Hauptdüse 1 umfasst den in dem Mischrohrkörper 2 einschraubbaren Injektor 3 und das mit dem Mischrohrkörper 2 verbundene Mischrohr 4.The main nozzle 1 comprises the injector 3 which can be screwed into the mixing tube body 2 and the mixing tube 4 connected to the mixing tube body 2.
Im Bereich des freien Endes des Mischrohres 4 ist erfindungsgemäß eine Einrichtung vorgesehen, welche das Ablenken des vorderen Endes 5a eines Schussfadens 5 aus etwa der Ebene der Längsmittenachse 4a des Mischrohres 4 mittels eines Luftstromes in Richtung der vertikal verlaufenden Längsmittenachse 17 der Einrichtung ermöglicht. Der Richtungspfeil, symbolisch als Druckleitung 8 dargestellt, zeigt die Strömungsrichtung des Luftstromes an. Im einzelnen besteht die Einrichtung aus einem die Wandung 4b des Mischrohres 4 vorzugsweise quer durchdringenden Einlasskanal 6 und aus einem dem Auslass 6a des Einlasskanals 6 diametral gegenüberliegend angeordneten Einlass 7a eines Auslasskanals 7.In the area of the free end of the mixing tube 4, a device is provided according to the invention which allows the front end 5a of a weft thread 5 to be deflected from approximately the plane of the longitudinal center axis 4a of the mixing tube 4 by means of an air stream in the direction of the vertically running longitudinal center axis 17 of the device. The direction arrow, symbolically represented as pressure line 8, shows the direction of flow of the air flow. In detail, the device consists of an inlet channel 6, preferably penetrating the wall 4b of the mixing tube 4, and an inlet 7a of an outlet channel 7 arranged diametrically opposite the outlet 6a of the inlet channel 6.
Der Druck P2 des von einer Druckquelle 10 gelieferten Luftstromes liegt an einem Ventil 9 an, das z.B. ein elektromagnetisch gesteuertes Ventil ist.The pressure P2 of the air flow supplied by a pressure source 10 is applied to a valve 9, which e.g. is an electromagnetically controlled valve.
Das Ventil 9 ist mit der Steuerelektronik 11 der Webmaschine über die Steuerleitung 12 signalübertragend verbunden. An einem weiteren Ventil 13, das ebenfalls mit der Steuerelektronik 11 der Webmaschine signalübertragend über die Steuerleitung 14 verbunden ist, liegt der Druck Pl eines den Schussfaden 5 impulsartig über die Druckleitung 15 beaufschlagenden Luftstromes an, welcher Luftstrom durch einen Richtungspfeil symbolisch dargestellt ist. Dieser Luftstrom dient dem Eintragen des Schussfadens in das Webfach. Zum Verständnis der erfindungsgemäßen Lösung sei noch erwähnt, dass, nachdem derThe valve 9 is connected to the control electronics 11 of the loom via the control line 12 in a signal-transmitting manner. At a further valve 13, which is also connected to the control electronics 11 of the weaving machine in a signal-transmitting manner via the control line 14, the pressure P 1 of an air flow acting on the weft thread 5 impulsively via the pressure line 15 is present, which air flow is symbolically represented by an arrow. This air flow serves to insert the weft thread into the shed. To understand the solution according to the invention, it should also be mentioned that after the
Schussfaden 5 mittels des unter dem Druckniveau Pl stehenden Luftstromes in das Webfach eingetragen ist, über die Steuerelektronik 11 und das Ventil 12 der Luftstrom in der Leitung 15 gesperrt und daraufhin der andere Luftstrom über das Ventil 9 der Einrichtung 6,7 zum Gestreckthalten des Schussfadens 5 zugeführt wird. Diese Vorgänge wiederholen sich ständig bei der Herstellung eines Gewebes. Zeichnungs-LegendeWeft thread 5 is entered into the shed by means of the air flow at pressure level Pl, the air flow in line 15 is blocked via control electronics 11 and valve 12, and then the other air flow via valve 9 of device 6, 7 for keeping the weft thread 5 straight is fed. These processes are constantly repeated during the manufacture of a fabric. Drawing Legend
HauptdüseMain Jet
MischrohrkörperMixing tube body
Injektorinjector
Mischrohr a Längsmittenachse b WandungMixing tube a longitudinal center axis b wall
Schussfaden a vorderes EndeWeft a front end
Einlasskanal a AuslassInlet duct a outlet
Auslasskanal a EinlassOutlet duct a inlet
Druckleitungpressure line
Ventil 0 Druckquelle 1 Steuerelektronik 2 Steuerleitung 3 Ventil 4 Steuerleitung 5 Druckleitung 6 Anschlussstück 6a Einlasskanal 6a' Auslass 6b Aulasskanal 6b' Auslass 7 Längsmittenachse Valve 0 pressure source 1 control electronics 2 control line 3 valve 4 control line 5 pressure line 6 connector 6a inlet duct 6a 'outlet 6b outlet duct 6b' outlet 7 longitudinal center axis

Claims

PATENTANSPRÜCHE
1. Verfahren zum Gestreckthalten des Schussfadens im Mischrohr der Hauptdüse einer Luftdüsenwebmaschine, wonach ein Längenabschnitt eines von vorzugsweise einem Vorspulgerät gelieferten Schussfadens während einer vorbestimmten Zeitdauer in dem Mischrohr der Hauptdüse durch einen eine Zugkraft auf den Schussfaden ausübenden Luftstrom beaufschlagt wird, welcher Luftstrom unter einem vorbestimmten Druckniveau steht, dadurch gekennzeichnet, dass der Luftstrom während der vorbestimmten Zeitdauer den Endbereich (5a) des Längenabschnitts in einem Winkel zur Längsmittenachse (4a) des Mischrohres (4) beaufschlagt.1. A method for keeping the weft thread in the mixing tube of the main nozzle of an air jet weaving machine, according to which a length section of a weft thread, which is preferably supplied by a prewinder, is acted upon in the mixing tube of the main nozzle for a predetermined period of time by an air stream exerting a tensile force on the weft thread, which air flow is below a predetermined one Pressure level, characterized in that the air flow acts on the end region (5a) of the longitudinal section at an angle to the longitudinal center axis (4a) of the mixing tube (4) for the predetermined period of time.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die vorbestimmte Zeitdauer wenigstens der Dauer eines Webzyklus entspricht.2. The method according to claim 1, characterized in that the predetermined time period corresponds at least to the duration of a weaving cycle.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Luftstrom in einem spitzen Winkel zur Längsmittenachse (4a) des Mischrohres (4) abgegeben wird.3. The method according to claim 1, characterized in that the air flow is emitted at an acute angle to the longitudinal center axis (4a) of the mixing tube (4).
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, d ass der Luftstrom in einem rechten Winkel zur Längsmittenachse (4a) des Mischrohres (4) abgegeben wird.4. The method according to claim 1, characterized in that the air flow is emitted at a right angle to the longitudinal center axis (4a) of the mixing tube (4).
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Luftstrom in einem stumpfen Winkel zur Längsmittenachse (4a) des Mischrohres (4) abgegeben wird.5. The method according to claim 1, characterized in that the air flow is emitted at an obtuse angle to the longitudinal center axis (4a) of the mixing tube (4).
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der von dem Luftstrom beaufschlagte Endbereich (5 a) des Längenabschnitts nach dem Einweben des Schussfadens (5) in ein Gewebe abgeschnitten wird.6. The method according to claim 1, characterized in that the end region (5 a) of the longitudinal section acted upon by the air flow is cut off into a fabric after the weft thread (5) has been woven in.
7. Luftdüsenwebmaschine zur Durchführung des Verfahrens nach Anspruch 1, umfassend, wenigstens ein ein Mischrohr (4) aufweisendes, pneumatisch beaufschlagbares Schussfadeneintragsmittel, wenigstens ein mit dem Schussfadeneintragsmittel über eine Druckleitung wirkverbundenes, steuerbares Ventil zum Beaufschlagen eines wenigstens im Mischrohr (4) gestreckt zu haltenden Längenabschnitt des von vorzugsweise einem Vorspulgerät gelieferten Schussfadens (5) mit einem vorbestimmten Druckniveau eines Luftstromes, wenigstens eine pneumatische Druckquelle und eine speicherprogrammierbare Webmaschinensteuerung (11) zum Ansteuern des wenigstens einen steuerbaren Ventils, dadurch gekennzeichnet, dass das Mischrohr (4) im Bereich seines freien Endes eine Einrichtung aufweist, die das vordere Ende (5 a) des Schussfadens (5) aus der Ebene der Längsmittenachse (4a) des Mischrohres (4) mittels des Luftstromes ablenkt.7. Air jet weaving machine for carrying out the method according to claim 1, comprising at least one weft insertion means which can be acted upon pneumatically and has at least one mixing tube (4), at least one which is operatively connected to the weft insertion means via a pressure line, Controllable valve for supplying a length section of the weft thread (5), which is preferably supplied by a pre-winding device, to be stretched at least in the mixing tube (4) with a predetermined pressure level of an air flow, at least one pneumatic pressure source and a programmable weaving machine control (11) for controlling the at least one controllable valve , characterized in that the mixing tube (4) has in the region of its free end a device which deflects the front end (5 a) of the weft thread (5) from the plane of the longitudinal center axis (4a) of the mixing tube (4) by means of the air flow.
8. Luftdüsenwebmaschine nach Anspruch 7, dadurch gekennzeichnet, dass die Einrichtung einen die Wandung (4b) des Mischrohres (4) durchdringenden Einlasskanal (6) mit Auslass (6a) und einen dem Auslass (6a) des Einlasskanals (6) diametral gegenüberliegend angeordneten Einlass (7a) eines Auslasskanals (7) umfasst.8. Air jet weaving machine according to claim 7, characterized in that the device comprises an inlet channel (6) with outlet (6a) penetrating the wall (4b) of the mixing tube (4) and an inlet arranged diametrically opposite the outlet (6a) of the inlet channel (6) (7a) of an outlet channel (7).
9. Luftdüsenwebmaschine nach Anspruch 7, dadurch gekennzeichnet, dass die Einrichtung ein mit dem freien Ende des Mischrohres (4) verbindbares Anschlussstück (16) mit einem9. Air jet loom according to claim 7, characterized in that the device has a connection piece (16) which can be connected to the free end of the mixing tube (4)
Einlasskanal (16a) mit Auslass (16a') und einem dem Auslass (16a') des Einlasskanals (16a) diametral gegenüberliegend angeordneten Einlass (16b') eines Auslasskanals (16b) umfasst.Inlet channel (16a) with outlet (16a ') and an inlet (16b') of an outlet channel (16b) arranged diametrically opposite the outlet (16a ') of the inlet channel (16a).
10. Luftdüsenwebmaschine nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass die Längsmittenachse (17) des Ein- und Auslasskanals (6,7) vorzugsweise quer zur10. Air jet loom according to one of claims 8 or 9, characterized in that the longitudinal center axis (17) of the inlet and outlet channel (6, 7) is preferably transverse to
Längsmittenachse (4a) des Mischrohrkanals (4) ausgerichtet ist . Longitudinal center axis (4a) of the mixing tube channel (4) is aligned.
PCT/DE2003/001434 2002-05-31 2003-05-06 Method for holding taut a weft thread and a loom for carrying out said method WO2003102282A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP03735272A EP1509645A1 (en) 2002-05-31 2003-05-06 Method for holding taut a weft thread and a loom for carrying out said method
BR0304920-5A BR0304920A (en) 2002-05-31 2003-05-06 Process for holding a loom weft in a stretched position for carrying out the process
JP2004509150A JP2005528535A (en) 2002-05-31 2003-05-06 Method for weft elongation and loom for carrying out the method
US10/516,555 US20050236062A1 (en) 2002-05-31 2003-05-06 Method for holding taut a weft thread and a loom for carrying out said method

Applications Claiming Priority (2)

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DE10224078.7 2002-05-31
DE10224078A DE10224078A1 (en) 2002-05-31 2002-05-31 Process for keeping a weft thread straight and weaving machine for carrying out the process

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JP2022014545A (en) * 2020-07-07 2022-01-20 株式会社豊田自動織機 Weft tensioning device
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BR0304920A (en) 2004-09-28
DE10224078A1 (en) 2003-12-18
JP2005528535A (en) 2005-09-22
CN1668796A (en) 2005-09-14
RU2004138791A (en) 2005-05-27
EP1509645A1 (en) 2005-03-02
US20050236062A1 (en) 2005-10-27

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