EP1264921B1 - Device for holding the weft yarn ends in an air jet loom - Google Patents

Device for holding the weft yarn ends in an air jet loom Download PDF

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Publication number
EP1264921B1
EP1264921B1 EP02009621A EP02009621A EP1264921B1 EP 1264921 B1 EP1264921 B1 EP 1264921B1 EP 02009621 A EP02009621 A EP 02009621A EP 02009621 A EP02009621 A EP 02009621A EP 1264921 B1 EP1264921 B1 EP 1264921B1
Authority
EP
European Patent Office
Prior art keywords
weft
air jet
weft thread
weaving loom
flow channel
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
EP02009621A
Other languages
German (de)
French (fr)
Other versions
EP1264921A2 (en
EP1264921A3 (en
Inventor
Andreas Weixler
Bernd Vögeli
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.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier GmbH
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 GmbH filed Critical Lindauer Dornier GmbH
Publication of EP1264921A2 publication Critical patent/EP1264921A2/en
Publication of EP1264921A3 publication Critical patent/EP1264921A3/en
Application granted granted Critical
Publication of EP1264921B1 publication Critical patent/EP1264921B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D47/3066—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

Definitions

  • the invention relates to a holding device for the ends of weft threads in an air jet loom according to the preamble of claim 1.
  • a device for stretching a registered weft thread in particular for an air-jet loom, known.
  • the device is according to the features of US 6014990 A arranged on the reed of a weaving machine that connects a channel of the stretching device to the weft insertion channel of the reed.
  • the end of a registered weft thread is stretched by means of an air flow generated by a tuyere.
  • the previously entered weft thread end is automatically released when the weft thread length is preferably provided.
  • a disadvantage of this invention is that the free weft thread end can lead to unwanted looping and inclusions in the fabric edge after coming out of the stretching device.
  • air jet looms which additionally have a weft thread holding device in the form of a suction device in the region of the weft stretching device. After weft insertion, stretching and striking the weft threads to the stop edge of the fabric, the weft ends are detected by the suction device and held until the weft threads are firmly integrated into the fabric and at least one catch strip to be formed.
  • the object of the invention is therefore to provide a holding device for the ends of the weft threads arising on the side of a shed, which prevents free weft thread ends from leading to a reduction in the quality of the fabric, and that can be dispensed with a costly suction device.
  • the holding device consists of a base body arranged stationarily on an air jet, which has a flow channel which can be acted upon with compressed air, in which the ends of the weft threads emerging from the shed are introduced and temporarily held, and the base body is arranged on the shed side on the shed is that the flow channel is transverse to the stop edge of the fabric.
  • the holding device according to the invention has the advantage that only the already existing on the machine compressed air is needed for their operation.
  • the holding device improves the running properties of the weaving machine, since the secure holding of the weft ends after stretching in the weft stretching device avoids the formation of unwanted loops and knocks on the fabric edge.
  • Figure 1 shows the view of the holding device from the perspective of the registered and emerging from the weft insertion channel of a reed weft thread.
  • the holding device comprises an approximately cuboid base body 1 of predetermined dimensions with a lower part 2 and an upper part 3. Both parts are connected by a connecting means 4, e.g. a screw, held together.
  • the main body 1 is stationary, e.g. arranged on the bearing plate (not shown) for the fabric width of the loom.
  • the main body 1 has an opening 5, through which the weft thread to be introduced passes in the direction of the arrow 12 and enters the region of a weft thread stretching device, not shown, where it is first grasped and stretched. While the weft is held stretched, it is struck by a movement of the reed in the direction of arrow 13 at the stop edge of the fabric. In this case, the weft thread passes into a slot 6 of the holding device, which adjoins the opening 5.
  • a flow channel 7 is formed in the lower part 2 of the base body 1, below the slot 6, which opens downwards (arrow 14) and in the direction of the fabric withdrawal (arrow 13).
  • the flow channel 7 is acted upon in the direction of arrow 14 with a compressed air flow, which detects the ends of several weft threads, presses down in the direction of arrow 14 and thus keeps in the flow channel 7.
  • the compressed air required for this purpose passes via a arranged at the upper part 3 of the body 1 compressed air connection 8 in a distribution channel 9, where it is distributed to a plurality of nozzles 11 and blown from above into the flow channel.
  • the distribution channel 9 is closed at the end by a closure 10.

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

Abstract

A weft holder device holds the free weft thread ends in an air jet loom, using pressurized air and without requiring a suction device. The body of the device has a tapering opening through which the end of the inserted weft thread extends. The opening tapers into a narrower slot in the beat-up and drawing-off direction. An air flow channel communicates downwardly from the slot. Nozzles blow pressurized air downwardly through the slot and into the channel, to pneumatically push the weft thread ends into the channel, so as to hold the weft thread ends from when they are beat-up and bound into the woven cloth and a catch selvage, until the catch selvage is trimmed from the cloth. The weft holder device may be stationarily mounted at a location between a weft detector and a weft tensioner that are connected to the reed so as to move therewith.

Description

Die Erfindung betrifft eine Halteeinrichtung für die Enden von Schussfäden bei einer Luftdüsenwebmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a holding device for the ends of weft threads in an air jet loom according to the preamble of claim 1.

Aus der US 6014990 A ist eine Vorrichtung zum Strecken eines eingetragenen Schussfadens, insbesondere für eine Luftdüsenwebmaschine, bekannt. Die Vorrichtung ist gemäß den Merkmalen der US 6014990 A derart am Webblatt einer Webmaschine angeordnet, dass sich ein Kanal der Streckvorrichtung an den Schusseintragskanal des Webblattes anschließt. In diesem Kanal und in einem Abzweigkanal wird das Ende eines eingetragenen Schussfadens mittels eines von einer Blasdüse erzeugten Luftstromes gestreckt. Während der Rückwärtsbewegung der Weblade mit der Streckvorrichtung kommt das zuvor eingetragene Schussfadenende bei bevorzugt vorgesehener Schussfadenlänge automatisch frei. Ein Nachteil dieser Erfindung besteht darin, dass das freie Schussfadenende nach dem Freikommen aus der Streckvorrichtung zu unerwünschter Schlingenbildung und Einschlüssen im Geweberand führen kann.From US 6014990 A, a device for stretching a registered weft thread, in particular for an air-jet loom, known. The device is according to the features of US 6014990 A arranged on the reed of a weaving machine that connects a channel of the stretching device to the weft insertion channel of the reed. In this channel and in a branch channel, the end of a registered weft thread is stretched by means of an air flow generated by a tuyere. During the backward movement of the sley with the stretching device, the previously entered weft thread end is automatically released when the weft thread length is preferably provided. A disadvantage of this invention is that the free weft thread end can lead to unwanted looping and inclusions in the fabric edge after coming out of the stretching device.

Zur Vermeidung dieses Nachteils sind Luftdüsenwebmaschinen gebaut worden, die im Bereich der Schussfadenstreckeinrichtung zusätzlich eine Schussfadenhalteeinrichtung in Form einer Saugeinrichtung aufweisen. Nach dem Schusseintrag, dem Strecken und dem Anschlagen der Schussfäden an die Anschlagkante des Gewebes werden die Schussfadenenden von der Saugeinrichtung erfasst und solange gehalten, bis die Schussfäden fest in dem Gewebe und in wenigstens einer zu bildenden Fangleiste eingebunden sind.To avoid this disadvantage air jet looms have been built, which additionally have a weft thread holding device in the form of a suction device in the region of the weft stretching device. After weft insertion, stretching and striking the weft threads to the stop edge of the fabric, the weft ends are detected by the suction device and held until the weft threads are firmly integrated into the fabric and at least one catch strip to be formed.

Nachteil dieser bekannten Anordnung ist, dass speziell für die Saugeinrichtung eine Unterdruckeinheit, ein sogenannter Ringverdichter, vorgesehen werden muss, welche die Saugdüse mit Unterdruck versorgt. Der Ringverdichter ist relativ groß und beansprucht an der Webmaschine einen relativ großen Bauraum. Ferner stellt der Ringverdichter einen nicht unerheblichen Kostenfaktor dar.Disadvantage of this known arrangement is that specially for the suction device, a vacuum unit, a so-called ring compressor, must be provided, which supplies the suction nozzle with negative pressure. The ring compressor is relatively large and claimed on the loom a relatively large amount of space. Furthermore, the ring compressor is a not inconsiderable cost factor.

Die Aufgabe der Erfindung liegt daher darin, eine Halteeinrichtung für die auszugsseitig eines Webfaches entstehenden Enden der Schussfäden zu schaffen, die verhindert, dass freie Schussfadenenden zu Qualitätsminderung des Gewebes führen, und dass dabei auf eine kostenaufwändige Saugeinrichtung verzichtet werden kann.The object of the invention is therefore to provide a holding device for the ends of the weft threads arising on the side of a shed, which prevents free weft thread ends from leading to a reduction in the quality of the fabric, and that can be dispensed with a costly suction device.

Die Aufgabe wird erfindungsgemäß durch die Merkmale der Ansprüche 1 und 6 gelöst. Erfindungswesentlich ist danach, dass die Halteeinrichtung aus einem stationär an einer Luftwebmaschine angeordneten Grundkörper besteht, der einen mit Druckluft beaufschlagbaren Strömungskanal aufweist, in welchem die auszugsseitig des Webfaches entstehenden Enden der Schussfäden eingebracht und temporär gehalten werden, und wobei der Grundkörper derart auszugsseitig des Webfaches angeordnet ist, dass der Strömungskanal quer zur Anschlagkante des Gewebes verläuft.The object is achieved by the features of claims 1 and 6. It is essential to the invention that the holding device consists of a base body arranged stationarily on an air jet, which has a flow channel which can be acted upon with compressed air, in which the ends of the weft threads emerging from the shed are introduced and temporarily held, and the base body is arranged on the shed side on the shed is that the flow channel is transverse to the stop edge of the fabric.

Die erfindungsgemäße Halteeinrichtung bietet den Vorteil, dass für ihren Betrieb ausschließlich die an der Maschine ohnehin vorhandene Druckluft benötigt wird. Ein Ringverdichter sowie eine Saugdüse im Bereich der Schussfadenstreckeinrichtung und diverse Schläuche entfallen, wodurch Kosten und Platz gespart wird.
Zusätzlich verbessert die Halteeinrichtung die Laufeigenschaften der Webmaschine, da durch das sichere Halten der Schussfadenenden nach dem Strecken in der Schussfadenstreckeinrichtung die Bildung von unerwünschten Schlingen und Einschlägen an der Gewebekante vermieden wird.The holding device according to the invention has the advantage that only the already existing on the machine compressed air is needed for their operation. A ring compressor and a suction nozzle in the range of weft stretching device and various hoses omitted, which costs and space is saved.
In addition, the holding device improves the running properties of the weaving machine, since the secure holding of the weft ends after stretching in the weft stretching device avoids the formation of unwanted loops and knocks on the fabric edge.

Ausgestaltende Merkmale der Erfindung sind in den abhängigen Ansprüchen offenbart.Ausgestaltende features of the invention are disclosed in the dependent claims.

Die Erfindung wird nachstehend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels erläutert.The invention will be explained below with reference to an embodiment shown in the drawings.

Es zeigen:

Figur 1
eine Seitenansicht der Halteeinrichtung und
Figur 2
einen Schnitt durch die Halteeinrichtung entlang der Linie A-A in Figur 1.
Show it:
FIG. 1
a side view of the holding device and
FIG. 2
a section through the holding device along the line AA in Figure 1.

Figur 1 zeigt die Ansicht der Halteeinrichtung aus Sicht des eingetragenen und aus dem Schusseintragskanal eines Webblattes austretenden Schussfadens. Die Halteeinrichtung umfasst einen etwa quaderförmigen Grundkörper 1 vorbestimmter Abmaße mit einem unteren Teil 2 und einem oberen Teil 3. Beide Teile werden von einem Verbindungsmittel 4, z.B. einer Schraube, zusammengehalten. Der Grundkörper 1 ist stationär, z.B. an der Lagerplatte (nicht dargestellt) für den Gewebebreithalter der Webmaschine angeordnet.Figure 1 shows the view of the holding device from the perspective of the registered and emerging from the weft insertion channel of a reed weft thread. The holding device comprises an approximately cuboid base body 1 of predetermined dimensions with a lower part 2 and an upper part 3. Both parts are connected by a connecting means 4, e.g. a screw, held together. The main body 1 is stationary, e.g. arranged on the bearing plate (not shown) for the fabric width of the loom.

Der Grundkörper 1 weist eine Öffnung 5 auf, durch die der einzutragende Schussfaden in Richtung des Pfeiles 12 hindurchtritt und in den Bereich einer nicht dargestellten Schussfadenstreckeinrichtung gelangt, wo er zunächst erfasst und gestreckt wird. Während der Schussfaden gestreckt gehalten wird, wird er durch eine Bewegung des Webblattes in Richtung des Pfeiles 13 an der Anschlagkante des Gewebes angeschlagen. Dabei gelangt der Schussfaden in einen Schlitz 6 der Halteeinrichtung, der sich an die Öffnung 5 anschließt.The main body 1 has an opening 5, through which the weft thread to be introduced passes in the direction of the arrow 12 and enters the region of a weft thread stretching device, not shown, where it is first grasped and stretched. While the weft is held stretched, it is struck by a movement of the reed in the direction of arrow 13 at the stop edge of the fabric. In this case, the weft thread passes into a slot 6 of the holding device, which adjoins the opening 5.

Wie am Besten in Figur 2 zu erkennen, ist im unteren Teil 2 des Grundkörpers 1, unterhalb des Schlitzes 6, ein Strömungskanal 7 ausgebildet, der sich nach unten (Pfeilrichtung 14) und in Richtung des Gewebeabzuges (Pfeilrichtung 13) öffnet. Der Strömungskanal 7 wird in Pfeilrichtung 14 mit einem Druckluftstrom beaufschlagt, der die Enden mehrerer Schussfäden erfasst, in Pfeilrichtung 14 nach unten drückt und so im Strömungskanal 7 hält.As best seen in Figure 2, a flow channel 7 is formed in the lower part 2 of the base body 1, below the slot 6, which opens downwards (arrow 14) and in the direction of the fabric withdrawal (arrow 13). The flow channel 7 is acted upon in the direction of arrow 14 with a compressed air flow, which detects the ends of several weft threads, presses down in the direction of arrow 14 and thus keeps in the flow channel 7.

Die hierfür benötigte Druckluft gelangt über einen am oberen Teil 3 des Grundkörpers 1 angeordneten Druckluftanschluss 8 in einen Verteilerkanal 9, wo sie auf mehrere Blasdüsen 11 verteilt und von oben in den Strömungskanal eingeblasen wird. Der Verteilerkanal 9 ist am Ende durch einen Verschluss 10 verschlossen.The compressed air required for this purpose passes via a arranged at the upper part 3 of the body 1 compressed air connection 8 in a distribution channel 9, where it is distributed to a plurality of nozzles 11 and blown from above into the flow channel. The distribution channel 9 is closed at the end by a closure 10.

Im Strömungskanal 7 werden also die Enden der an der Anschlagkante des Gewebes angeschlagenen Schussfäden temporär gehalten, bis sie, bei vorhandener Fangleiste, zusammen mit der Fangleiste vom Gewebe abgetrennt und entsorgt werden.In the flow channel 7, therefore, the ends of the posted at the stop edge of the fabric weft threads are temporarily held until they are separated and disposed of in the tissue with existing catch strip, together with the catch strip from the tissue.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Grundkörperbody
22
unteres Teillower part
33
oberes Teilupper part
44
Verbindungsmittelconnecting means
55
Öffnungopening
66
Schlitzslot
77
Strömungskanalflow channel
88th
DruckluftanschlussCompressed air connection
99
Verteilerkanaldistribution channel
1010
Verschlussshutter
1111
Blasdüsennozzles
1212
Pfeilrichtung (Schusseintrag)Arrow direction (weft insertion)
1313
Pfeilrichtung (Gewebeabzug)Arrow direction (fabric withdrawal)
1414
Pfeilrichtung (Luftströmung)Arrow direction (air flow)

Claims (6)

  1. An air jet weaving loom having a device for holding the ends of weft threads, comprising a base element (1), which has a flow channel (7) pressurisable with compressed air in which the extraction-side ends of the weft threads inserted in a shed are positioned and temporarily held, characterised in that the base element (1) is arranged fixedly on the air jet weaving loom.
  2. An air jet weaving loom according to claim 1, characterised in that the base element (1) has an opening (5) through which the weft threads are guided during weft thread insertion into the shed, the opening (5) narrowing in the direction of cloth take-off (13) to a slot (6) of predetermined dimensions.
  3. An air jet weaving loom according to claim 1, characterised in that the base element (1) comprises two detachably interconnected parts (2, 3), the flow channel (7) being arranged in the one part and means for pressurizing the weft thread ends being arranged in the other part.
  4. An air jet weaving loom according to claim 3, characterised in that the means comprise a compressed air connection (8), a distribution duct (9) and a plurality of blast nozzles (11) directed into the flow channel (7).
  5. An air jet weaving loom according to claim 1, characterised in that the flow channel (7) is open in the direction of the compressed air flow (14) and in the direction of cloth take-off (13).
  6. An air jet weaving loom according to any one of claims 1 to 5, characterised in that the holding device is fixedly arranged at a suitable point of the weaving loom between a weft thread detecting device connected to the reed and a weft thread drawing device connected to the reed.
EP02009621A 2001-05-10 2002-04-27 Device for holding the weft yarn ends in an air jet loom Expired - Lifetime EP1264921B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20107885U 2001-05-10
DE20107885U DE20107885U1 (en) 2001-05-10 2001-05-10 Holding device for the ends of weft threads in an air jet loom

Publications (3)

Publication Number Publication Date
EP1264921A2 EP1264921A2 (en) 2002-12-11
EP1264921A3 EP1264921A3 (en) 2003-09-17
EP1264921B1 true EP1264921B1 (en) 2006-06-28

Family

ID=7956713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02009621A Expired - Lifetime EP1264921B1 (en) 2001-05-10 2002-04-27 Device for holding the weft yarn ends in an air jet loom

Country Status (5)

Country Link
US (1) US6758246B2 (en)
EP (1) EP1264921B1 (en)
JP (1) JP2002371448A (en)
AT (1) ATE331828T1 (en)
DE (2) DE20107885U1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016236A6 (en) * 2004-03-05 2006-05-02 Picanol Nv EDGE INSTALLATION DEVICE FOR A WEAVING MACHINE.
EP1927691B1 (en) * 2006-11-29 2010-02-17 ITEMA (Switzerland) Ltd. Weft holding device and method for a rapier weaving machine
DE102015217356B3 (en) * 2015-09-10 2016-10-20 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Weaving machine with a device and method for holding, feeding and entering weft threads in a shed

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342135A1 (en) * 1988-05-10 1989-11-15 S.A. Saurer Diederichs Weft suction and retaining device for weaving machines using jet weft inserting
BE1005230A3 (en) * 1991-01-04 1993-06-01 Picanol Nv Device for seeking an impact on wire looms.
US5224521A (en) * 1991-04-30 1993-07-06 Sulzer Brothers Limited Weft catcher with gripping device
DE4213754C1 (en) * 1992-04-25 1993-12-02 Dornier Gmbh Lindauer Device for the pneumatic guiding of turbulent weft ends of an auxiliary fabric strip in air jet weaving machines
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
BE1009619A6 (en) * 1995-10-02 1997-06-03 Picanol Nv STRETCHER FOR WEAVING MACHINES.
DE19545839C1 (en) * 1995-12-08 1996-08-29 Dornier Gmbh Lindauer Air jet loom with weft thread auxiliary suction nozzle saves material
DE19728013A1 (en) * 1997-07-01 1999-01-07 Textilma Ag Device for stretching and tensioning a weft thread and weaving machine with such a device

Also Published As

Publication number Publication date
EP1264921A2 (en) 2002-12-11
US6758246B2 (en) 2004-07-06
ATE331828T1 (en) 2006-07-15
EP1264921A3 (en) 2003-09-17
DE20107885U1 (en) 2001-10-11
JP2002371448A (en) 2002-12-26
US20020166599A1 (en) 2002-11-14
DE50207359D1 (en) 2006-08-10

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