EP2175058A1 - Loom with yarn quality sensor - Google Patents

Loom with yarn quality sensor Download PDF

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Publication number
EP2175058A1
EP2175058A1 EP08017764A EP08017764A EP2175058A1 EP 2175058 A1 EP2175058 A1 EP 2175058A1 EP 08017764 A EP08017764 A EP 08017764A EP 08017764 A EP08017764 A EP 08017764A EP 2175058 A1 EP2175058 A1 EP 2175058A1
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EP
European Patent Office
Prior art keywords
weft
yarn
quality sensor
weaving machine
yarn quality
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Granted
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EP08017764A
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German (de)
French (fr)
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EP2175058B1 (en
Inventor
Walter Schümperli
Erich Weidmann
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Loepfe AG Gebrueder
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Loepfe AG Gebrueder
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Priority to EP20080017764 priority Critical patent/EP2175058B1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B65H63/062—Electronic slub detector
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/342—Handling the weft between bulk storage and weft-inserting means knot detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a weaving machine with yarn quality sensor according to the preamble of claim 1.
  • Yarn defects can affect the quality of fabric. Therefore, the yarn used for weaving is subjected to regular quality controls.
  • lint i. Tufts entrained by the yarn present a problem in the fabric, but e.g. also knots or other yarn defects.
  • JP 7-42069 It is proposed to use a lint monitor in the weaving machine, but the sensor principle described there requires a complicated mechanical deflection of the yarn and would not be suitable for on-line measurement on the jerk-accelerated weft.
  • a yarn quality sensor is arranged between the weft feeder and the compartment.
  • This arrangement is based on the finding that yarn defects, in particular in the weft thread, are still relatively late, e.g. in the loom, can arise.
  • a tufts of fibers accumulate, which are entrained by the yarn at a certain time and introduced into the fabric. Due to the arrangement of the quality sensor after the weft feeder and such errors can still be detected.
  • the yarn quality sensor is a non-contact sensor, so that it itself can not contribute to deterioration of the yarn quality.
  • the invention also relates to a method of operating a weaving machine in which the weft thread moved by the weft drive is moved between the weft feeder and the tray by a yarn quality sensor.
  • the yarn quality sensor In the yarn quality sensor, at least one quality feature, e.g. the diameter or cross section of the yarn measured.
  • the invention is particularly suitable for detecting lint on the weft thread.
  • FIG. 1 schematically represents a weaving machine in the region of the weft insertion in front of the compartment.
  • the loom according to Fig. 1 has a reed 2 with the sheets 3, which lead in a known manner, the warp threads 4 and used to hit the weft thread 5a.
  • the warp threads 4 are stretched towards the compartment 1 and a weft thread 5a is inserted into the compartment.
  • a last weft thread guide 6 which guides the weft thread 5a to be inserted in the warp direction X and in the vertical direction Z.
  • the weft guide 6 may be, for example, a U- or V-shaped guide, as in Fig. 1 represented, act, or even around two transverse guide rods.
  • the weft guide 6 is fixedly mounted on a holder 11 which does not follow the movement of the reed 2.
  • a looper weaving machine which has at least one driven gripper 7 as a weft thread drive, which in the in Fig. 1 Operating phase shown in the tray 1 and the weft 5a in Weft direction Y has pulled into the tray.
  • the present invention can also be used for use on weaving machines with a different weft thread drive, in particular on projectile or air-jet weaving machines.
  • a weft feeder 9 For supplying the weft thread in a transfer area 8 in front of the compartment 4, a weft feeder 9 is provided.
  • the weft feeder 9 is a weft changer with a plurality of movably arranged eye arms 10a-10d, with which at least one of a plurality of weft threads 5a-5d can optionally be fed to the transfer area 8.
  • each eye arm 10a-10d leads in each case one of the weft threads 5a-5d and can optionally be moved into the transfer area 8. The weft thread brought into this area is then taken over by the weft drive and entered into the compartment 1.
  • a yarn quality sensor 12 is stationarily arranged. In the execution after Fig. 1 he is attached to the holder 11.
  • the yarn quality sensor 12 serves to measure the yarn quality. This is to be understood as the measurement of at least one parameter which allows a conclusion to be drawn on a quality feature of the yarn.
  • the yarn quality sensor 12 is configured as a lint sensor, which is able to detect lint adhering to the yarn or possibly also other thickenings.
  • Yarn quality sensor 12 preferably operates without contact, i. he does not touch the weft 5a. This reduces the risk that e.g. at the yarn quality sensor 12 fibers accumulate, which are then entrained by the weft yarn as fluff in the subject.
  • the yarn quality sensor has a frame 13, in which a measuring region 14 is arranged and which has an opening 15 perpendicular to the weft yarn direction Y, through which the Weft 5a can be introduced transversely to the weft direction (Y) in the measuring range 14.
  • the weft 5a which has been brought from the weft feeder 9 in the transfer area 8, from the weft drive, i. from the gripper 7, recorded and guided into the tray. In doing so, it moves in the region of the yarn quality sensor 12 by a certain offset transversely to the weft direction Y, i. in the warp direction X and / or vertical direction Z, and is thus introduced through the opening 15 in the measuring region 14 of the yarn quality sensor 12. Shortly thereafter, and before it touches the frame 13, it comes into contact with the weft guide 6, so that further movement in the warp direction X and / or vertical direction Z is stopped, thus preventing contact of the frame 13.
  • the weft 5a is in the measuring range 14, its quality can be monitored. If it is determined that the measured quality parameter does not satisfy a desired criterion, then e.g. the operation of the loom may be interrupted to remove the faulty shot, or the error may be statistically evaluated, e.g. stop the machine only in case of an accumulation of errors and / or to determine a quality specification for the produced fabric.
  • a desired criterion e.g. the operation of the loom may be interrupted to remove the faulty shot, or the error may be statistically evaluated, e.g. stop the machine only in case of an accumulation of errors and / or to determine a quality specification for the produced fabric.
  • the yarn quality sensor preferably forms a light barrier, with light source and receiver e.g. can be arranged in the frame 13.
  • the weft in the measuring area 14 shadows a portion of the light from the light source, so that the signal at the receiver is reduced accordingly. If the yarn has a thickening, e.g. in the form of a flute or a node, this leads to a momentary strong signal reduction, which can be detected.
  • the measuring region 14 preferably has a smaller dimension in the weft direction Y than in the warp direction X and the vertical direction Z.
  • the small dimension in the weft direction Y also results small imperfections to a strong, well detectable signal, while large dimensions in the warp direction X and vertical direction Z make the detection against transverse movements of the weft thread 5a insensitive.
  • This geometry of the measuring region 14 can be realized by an elongated configuration of the light source and the light receiver in the direction transverse to the weft direction Y and by a sufficiently large distance between the light source and the light receiver.
  • the yarn quality sensor 12 may be constructed in other ways, e.g. as a reflective optical sensor which measures light reflected or scattered by the weft yarn, or as a capacitive sensor in which the yarn cross section is measured without contact by passing weft yarn between two plates of a capacitor.
  • Corresponding sensors are known to those skilled in the art of yarn quality measurement, e.g. at Umspulstationen, known.
  • the yarn quality sensor is disposed between the weft feeder 9 and the weft yarn guide 6. This arrangement is preferred because there is usually a lot of space in this area, especially in rapier looms.
  • the yarn quality sensor 12 can also be integrated directly into the weft thread guide 6.
  • weft yarns of very different thicknesses are used, often only the thickest weft yarn causes problems (fluff). However, if all weft yarns are to be monitored for fluff with different thickness weft yarns, then a different threshold value can be specified for each weft yarn.
  • a loom used with weft changer with which optionally a plurality of weft threads can be entered, it allows the arrangement of the yarn quality sensor 12 between the weft changer and the compartment to monitor the quality of all weft yarns with only one sensor.
  • the yarn quality sensor is preferably arranged after the main nozzle and in front of the compartment.
  • the yarn quality sensor is preferably arranged in front of the compartment in such a way that the projectile traverses the measuring range of the sensor and pulls the weft thread through the measuring area. In this case, e.g. to provide a synchronization with the machine cycle to suppress the error detection during the passage of the projectile through the measuring range.

Abstract

The loom has a non-contact yarn quality sensor (12) in the passage of the weft yarn at the transfer zone (8) between the weft guide (9) and the shed (1). The sensor registers the yarn diameter or cross section and detects the presence of any lint. The sensor forms a light barrier with a measurement zone (14) at a frame (13) at right angles to the weft movement line (Y) and an opening (15) across the weft.

Description

Die Erfindung betrifft eine Webmaschine mit Garnqualitätssensor gemäss Oberbegriff von Anspruch 1.The invention relates to a weaving machine with yarn quality sensor according to the preamble of claim 1.

Garnfehler können die Qualität von Gewebe beeinträchtigen. Deshalb wird das zum Weben verwendete Garn regelmässigen Qualitätskontrollen unterworfen.Yarn defects can affect the quality of fabric. Therefore, the yarn used for weaving is subjected to regular quality controls.

Insbesondere sind Flusen, d.h. Faserbüschel, welche vom Garn mitgerissen werden, im Gewebe ein Problem, aber z.B. auch Knoten oder andere Garnfehler.In particular, lint, i. Tufts entrained by the yarn present a problem in the fabric, but e.g. also knots or other yarn defects.

In JP 7-42069 wird vorgeschlagen, im Bereich der Webmaschine einen Flusenwächter einzusetzen, wobei das dort beschriebene Sensorprinzip jedoch eine komplizierte mechanische Umlenkung des Garns erfordert und zur on-line Messung am ruckartig beschleunigten Schussfaden nicht geeignet wäre.In JP 7-42069 It is proposed to use a lint monitor in the weaving machine, but the sensor principle described there requires a complicated mechanical deflection of the yarn and would not be suitable for on-line measurement on the jerk-accelerated weft.

Es stellt sich die Aufgabe, eine Webmaschine sowie ein Verfahren zum Betrieb einer Webmaschine bereitzustellen, welche eine bessere Qualitätsüberwachung erlauben.It has as its object to provide a loom and a method for operating a weaving machine, which allow better quality control.

Diese Aufgabe wird von den unabhängigen Ansprüchen erfüllt. Anspruchsgemäss ist zwischen der Schussfadenzuführung und dem Fach ein Garnqualitätssensor angeordnet.This object is met by the independent claims. According to the claims, a yarn quality sensor is arranged between the weft feeder and the compartment.

Diese Anordnung basiert auf der Erkenntnis, dass Garnfehler insbesondere beim Schussfaden noch relativ spät, z.B. in der Webmaschine, entstehen können. So kann sich z.B. im Bereich der Schussfadenzuführung ein Faserbüschel ansammeln, welches zu einem gewissen Zeitpunkt vom Garn mitgerissen und ins Gewebe eingetragen wird. Durch die Anordnung des Qualitätssensors nach der Schussfadenzuführung können auch solche Fehler noch erkannt werden.This arrangement is based on the finding that yarn defects, in particular in the weft thread, are still relatively late, e.g. in the loom, can arise. Thus, for example, In the area of the weft feeder, a tufts of fibers accumulate, which are entrained by the yarn at a certain time and introduced into the fabric. Due to the arrangement of the quality sensor after the weft feeder and such errors can still be detected.

Vorzugsweise ist der Garnqualitätssensor ein berührungsloser Sensor, damit er selbst nicht zu einer Beeinträchtigung der Garnqualität beitragen kann.Preferably, the yarn quality sensor is a non-contact sensor, so that it itself can not contribute to deterioration of the yarn quality.

Die Erfindung betrifft auch ein Verfahren zum Betrieb einer Webmaschine, bei welchem der vom Schussfadenantrieb bewegte Schussfaden durch einen Garnqualitätssensor zwischen der Schussfadenzuführung und dem Fach bewegt wird. Im Garnqualitätssensor wird mindestens ein Qualitätsmerkmal, wie z.B. der Durchmesser oder Querschnitt, des Garns gemessen.The invention also relates to a method of operating a weaving machine in which the weft thread moved by the weft drive is moved between the weft feeder and the tray by a yarn quality sensor. In the yarn quality sensor, at least one quality feature, e.g. the diameter or cross section of the yarn measured.

Besonders geeignet ist die Erfindung zur Erkennung von Flusen am Schussfaden.The invention is particularly suitable for detecting lint on the weft thread.

Weitere bevorzugte Ausführungen der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels. Dabei wird Bezug genommen auf die beiliegende Fig. 1, welche schematisch eine Webmaschine im Bereich des Schussfadeneintrags vor dem Fach darstellt.Further preferred embodiments of the invention will become apparent from the following description of an embodiment. Reference is made to the attached Fig. 1 which schematically represents a weaving machine in the region of the weft insertion in front of the compartment.

Die Webmaschine gemäss Fig. 1 besitzt ein Riet 2 mit den Blättern 3, welche in bekannter Weise die Kettfäden 4 führen und zum Anschlagen des Schussfadens 5a verwendet werden. In der Position nach Fig. sind die Kettfäden 4 zum Fach 1 aufgespannt und es wird ein Schussfaden 5a in das Fach eingetragen.The loom according to Fig. 1 has a reed 2 with the sheets 3, which lead in a known manner, the warp threads 4 and used to hit the weft thread 5a. In the position shown in FIG. 4, the warp threads 4 are stretched towards the compartment 1 and a weft thread 5a is inserted into the compartment.

Unmittelbar vor dem Fach 1 ist eine letzte Schussfadenführung 6 vorgesehen, welche den einzutragenden Schussfaden 5a in Kettfadenrichtung X und in vertikaler Richtung Z führt. (Der Begriff "vertikal" bezeichnet dabei die Richtung senkrecht zu X und Z, unabhängig von der Orientierung der Webmaschine.) Bei der Schussfadenführung 6 kann es sich z.B. um eine U- oder V-förmige Führung, wie in Fig. 1 dargestellt, handeln, oder aber auch um zwei quer zueinander stehende Führungsstäbe.Immediately in front of the compartment 1, a last weft thread guide 6 is provided which guides the weft thread 5a to be inserted in the warp direction X and in the vertical direction Z. (The term "vertical" refers to the direction perpendicular to X and Z, regardless of the orientation of the loom.) The weft guide 6 may be, for example, a U- or V-shaped guide, as in Fig. 1 represented, act, or even around two transverse guide rods.

Die Schussfadenführung 6 ist stationär an einem Halter 11 angebracht, welcher der Bewegung des Riets 2 nicht folgt.The weft guide 6 is fixedly mounted on a holder 11 which does not follow the movement of the reed 2.

Die in Fig. 1 dargestellte Webmaschine ist eine Greifer-Webmaschine, welche als Schussfadenantrieb mindestens einen angetriebenen Greifer 7 aufweist, welcher sich in der in Fig. 1 dargestellten Betriebsphase gerade im Fach 1 befindet und den Schussfaden 5a in Schussfadenrichtung Y in das Fach gezogen hat. Es ist jedoch zu betonen, dass die vorliegende Erfindung auch für den Einsatz auf Webmaschinen mit anderem Schussfadenantrieb, insbesondere auf Projektil- oder Luftwebmaschinen einsetzbar ist.In the Fig. 1 Loom shown is a looper weaving machine, which has at least one driven gripper 7 as a weft thread drive, which in the in Fig. 1 Operating phase shown in the tray 1 and the weft 5a in Weft direction Y has pulled into the tray. However, it should be emphasized that the present invention can also be used for use on weaving machines with a different weft thread drive, in particular on projectile or air-jet weaving machines.

Zum Zuführen des Schussfadens in einen Übergabebereich 8 vor dem Fach 4 ist eine Schussfadenzuführung 9 vorgesehen. In der Ausführung nach Fig. 1 ist die Schussfadenzuführung 9 ein Schussfadenwechsler mit mehreren beweglich angeordneten Ösenarmen 10a - 10d, mit welchen jeweils mindestens einer von mehreren Schussfäden 5a - 5d wahlweise dem Übergabebereich 8 zugeführt werden kann. Hierzu führt jeder Ösenarm 10a - 10d jeweils einen der Schussfäden 5a - 5d und kann wahlweise in den Übergabebereich 8 bewegt werden. Der jeweils in diesen Bereich gebrachte Schussfaden wird sodann vom Schussfadenantrieb übernommen und ins Fach 1 eingetragen.For supplying the weft thread in a transfer area 8 in front of the compartment 4, a weft feeder 9 is provided. In the execution after Fig. 1 the weft feeder 9 is a weft changer with a plurality of movably arranged eye arms 10a-10d, with which at least one of a plurality of weft threads 5a-5d can optionally be fed to the transfer area 8. For this purpose, each eye arm 10a-10d leads in each case one of the weft threads 5a-5d and can optionally be moved into the transfer area 8. The weft thread brought into this area is then taken over by the weft drive and entered into the compartment 1.

Zwischen der Schussfadenzuführung 9 und dem Fach 1 ist stationär ein Garnqualitätssensor 12 angeordnet. In der Ausführung nach Fig. 1 ist er am Halter 11 angebracht. Wie eingangs erwähnt, dient der Garnqualitätssensor 12 dazu, die Garnqualität zu messen. Hierunter ist die Messung mindestens eines Parameters zu verstehen, der einen Rückschluss auf ein Qualitätsmerkmal des Garns erlaubt. Vorzugsweise ist der Garnqualitätssensor 12 als Flusensensor ausgestaltet, der am Garn anhaftende Flusen oder eventuell auch andere Verdickungen zu detektieren vermag.Between the weft feeder 9 and the tray 1, a yarn quality sensor 12 is stationarily arranged. In the execution after Fig. 1 he is attached to the holder 11. As mentioned above, the yarn quality sensor 12 serves to measure the yarn quality. This is to be understood as the measurement of at least one parameter which allows a conclusion to be drawn on a quality feature of the yarn. Preferably, the yarn quality sensor 12 is configured as a lint sensor, which is able to detect lint adhering to the yarn or possibly also other thickenings.

Der Garnqualitätssensor 12 arbeitet vorzugsweise berührungslos, d.h. er berührt den Schussfaden 5a nicht. Dadurch wird die Gefahr reduziert, dass sich z.B. am Garnqualitätssensor 12 Fasern ansammeln, die sodann vom Schussfaden als Flusen ins Fach mitgerissen werden.Yarn quality sensor 12 preferably operates without contact, i. he does not touch the weft 5a. This reduces the risk that e.g. at the yarn quality sensor 12 fibers accumulate, which are then entrained by the weft yarn as fluff in the subject.

In der Ausführung nach Fig. 1 besitzt der Garnqualitätssensor einen Rahmen 13, in welchem ein Messbereich 14 angeordnet ist und der senkrecht zur Schussfadenrichtung Y eine Öffnung 15 aufweist, durch welche der Schussfaden 5a quer zur Schussfadenrichtung (Y) in den Messbereich 14 eingeführt werden kann.In the execution after Fig. 1 the yarn quality sensor has a frame 13, in which a measuring region 14 is arranged and which has an opening 15 perpendicular to the weft yarn direction Y, through which the Weft 5a can be introduced transversely to the weft direction (Y) in the measuring range 14.

Im Betrieb wird der Schussfaden 5a, der von der Schussfadenzuführung 9 in den Übergabebereich 8 gebracht wurde, vom Schussfadenantrieb, d.h. vom Greifer 7, erfasst und ins Fach geführt. Dabei bewegt er sich im Bereich des Garnqualitätssensors 12 um einen gewissen Versatz quer zur Schussfadenrichtung Y, d.h. in Kettfadenrichtung X und/oder Vertikalrichtung Z, und wird so durch die Öffnung 15 in den Messbereich 14 des Garnqualitätssensors 12 eingeführt. Kurz danach, und bevor er den Rahmen 13 berührt, kommt er in Kontakt mit der Schussfadenführung 6, so dass eine weitere Bewegung in Kettfadenrichtung X und/oder Vertikalrichtung Z gestoppt und so eine Berührung des Rahmens 13 verhindert wird.In operation, the weft 5a, which has been brought from the weft feeder 9 in the transfer area 8, from the weft drive, i. from the gripper 7, recorded and guided into the tray. In doing so, it moves in the region of the yarn quality sensor 12 by a certain offset transversely to the weft direction Y, i. in the warp direction X and / or vertical direction Z, and is thus introduced through the opening 15 in the measuring region 14 of the yarn quality sensor 12. Shortly thereafter, and before it touches the frame 13, it comes into contact with the weft guide 6, so that further movement in the warp direction X and / or vertical direction Z is stopped, thus preventing contact of the frame 13.

Sobald der Schussfaden 5a sich im Messbereich 14 befindet, kann dessen Qualität überwacht werden. Wird dabei festgestellt, dass der gemessene Qualitätsparameter ein gewünschtes Kriterium nicht erfüllt, so kann z.B. der Betrieb der Webmaschine unterbrochen werden, um den fehlerhaften Schuss zu entfernen, oder der Fehler kann statistisch ausgewertet werden, um z.B. die Maschine nur bei einer Häufung von Fehlern zu stoppen und/oder eine Qualitätsangabe für das hergestellte Gewebe zu ermitteln.Once the weft 5a is in the measuring range 14, its quality can be monitored. If it is determined that the measured quality parameter does not satisfy a desired criterion, then e.g. the operation of the loom may be interrupted to remove the faulty shot, or the error may be statistically evaluated, e.g. stop the machine only in case of an accumulation of errors and / or to determine a quality specification for the produced fabric.

Der Garnqualitätssensor bildet vorzugsweise eine Lichtschranke, wobei Lichtquelle und -empfänger z.B. im Rahmen 13 angeordnet sein können. Der Schussfaden im Messbereich 14 schattet einen Teil des Lichts von der Lichtquelle ab, so dass das Signal am Empfänger entsprechend reduziert wird. Besitzt das Garn eine Verdickung, z.B. in Form einer Fluse oder eines Knotens, so führt dies zu einer momentanen starken Signalreduktion, welche detektiert werden kann.The yarn quality sensor preferably forms a light barrier, with light source and receiver e.g. can be arranged in the frame 13. The weft in the measuring area 14 shadows a portion of the light from the light source, so that the signal at the receiver is reduced accordingly. If the yarn has a thickening, e.g. in the form of a flute or a node, this leads to a momentary strong signal reduction, which can be detected.

Vorzugsweise besitzt der Messbereich 14 in Schussfadenrichtung Y eine kleinere Abmessung als in Kettfadenrichtung X und Vertikalrichtung Z. Durch die kleine Abmessung in Schussfadenrichtung Y führen auch kleine Fehlstellen zu einem starken, gut detektierbaren Signal, während grosse Abmessungen in Kettfadenrichtung X und Vertikalrichtung Z die Detektion gegenüber Querbewegungen des Schussfadens 5a unempfindlich machen.The measuring region 14 preferably has a smaller dimension in the weft direction Y than in the warp direction X and the vertical direction Z. The small dimension in the weft direction Y also results small imperfections to a strong, well detectable signal, while large dimensions in the warp direction X and vertical direction Z make the detection against transverse movements of the weft thread 5a insensitive.

Diese Geometrie des Messbereichs 14 kann durch eine längliche Ausgestaltung der Lichtquelle und des Lichtempfängers in Richtung quer zur Schussfadenrichtung Y und durch einen ausreichend grossen Abstand zwischen Lichtquelle und Lichtempfänger realisiert werden.This geometry of the measuring region 14 can be realized by an elongated configuration of the light source and the light receiver in the direction transverse to the weft direction Y and by a sufficiently large distance between the light source and the light receiver.

Es ist jedoch zu betonen, dass der Garnqualitätssensor 12 auch in anderer Weise aufgebaut sein kann, z.B. als reflektiv arbeitender optischer Sensor, der vom Schussfaden zurückgeworfenes oder gestreutes Licht misst, oder als kapazitiver Sensor, bei welchem der Garnquerschnitt berührungslos gemessen wird, indem Schussfaden zwischen zwei Platten eines Kondensators hindurchgeführt wird. Entsprechende Sensoren sind dem Fachmann aus dem Gebiet der Garnqualitätsmessung, z.B. an Umspulstationen, bekannt.It should be understood, however, that the yarn quality sensor 12 may be constructed in other ways, e.g. as a reflective optical sensor which measures light reflected or scattered by the weft yarn, or as a capacitive sensor in which the yarn cross section is measured without contact by passing weft yarn between two plates of a capacitor. Corresponding sensors are known to those skilled in the art of yarn quality measurement, e.g. at Umspulstationen, known.

In der Ausführung nach Fig. 1 ist der Garnqualitätssensor zwischen der Schussfadenzuführung 9 und der Schussfadenführung 6 angeordnet. Diese Anordnung ist bevorzugt, da in diesem Bereich in der Regel viel Platz ist, insbesondere bei Greiferwebmaschinen.In the execution after Fig. 1 the yarn quality sensor is disposed between the weft feeder 9 and the weft yarn guide 6. This arrangement is preferred because there is usually a lot of space in this area, especially in rapier looms.

Grundsätzlich ist jedoch auch eine Anordnung zwischen Schussfadenführung 6 und Fach 1 denkbar, wie dies in Fig. 1 gestrichelt unter Bezugsziffer 17 illustriert ist.In principle, however, an arrangement between the weft guide 6 and tray 1 is conceivable, as in Fig. 1 dashed lines under reference numeral 17 is illustrated.

Grundsätzlich kann der Garnqualitätssensor 12 auch direkt in die Schussfadenführung 6 integriert werden.In principle, the yarn quality sensor 12 can also be integrated directly into the weft thread guide 6.

Es zeigt sich, dass bei Verwendung des Garnqualitätssensors 12 zur Detektion von Flusen oder Dickstellen (Knoten) eine Synchronisation der Detektion mit dem Maschinenzyklus nicht erforderlich ist, zumindest wenn die Schussfäden ungefähr gleich dick sind oder zumindest nicht stark voneinander abweichen, denn grundsätzlich sollte zu keinem Zeitpunkt des Zyklus die Menge von Garn im Messbereich 14 einen gewissen Schwellwert überschreiten. Ist dies dennoch der Fall, so kann zuverlässig auf einen Fehler geschlossen werden. Wird als Qualitätssensor eine Lichtschranke eingesetzt, kann das Signal des Empfängers hierzu z.B. auf die Unterschreitung eines unteren Schwellwerts überwacht werden.It turns out that when using the yarn quality sensor 12 for the detection of fluff or thick spots (nodes) synchronization of the detection with the machine cycle is not required, at least if the weft threads are approximately the same thickness or at least not very different, because in principle At any point in the cycle, the amount of yarn in the measurement area 14 should not exceed a certain threshold. If this is still the case, then it can be reliably concluded that there is an error. If a photoelectric sensor is used as the quality sensor, the signal of the receiver can be monitored, for example, for the undershooting of a lower threshold value.

Werden Schussgarne stark unterschiedlicher Dicken verwendet, so macht oftmals nur der dickste Schussfaden Probleme (Flusen). Wenn jedoch bei verschieden dicken Schussgarnen alle Schussgarne auf Flusen überwacht werden sollen, so kann pro Schussgarn ein unterschiedlicher Schwellwert vorgegeben werden.If weft yarns of very different thicknesses are used, often only the thickest weft yarn causes problems (fluff). However, if all weft yarns are to be monitored for fluff with different thickness weft yarns, then a different threshold value can be specified for each weft yarn.

Wird, wie im Beispiel gemäss Fig. 1 dargestellt, eine Webmaschine mit Schussfadenwechsler eingesetzt, mit welchem wahlweise mehrere Schussfäden eingetragen werden können, so erlaubt es die Anordnung des Garnqualitätssensors 12 zwischen dem Schussfadenwechsler und dem Fach, mit nur einem Sensor die Qualität aller Schussfäden zu überwachen.Is, as in the example according to Fig. 1 shown, a loom used with weft changer, with which optionally a plurality of weft threads can be entered, it allows the arrangement of the yarn quality sensor 12 between the weft changer and the compartment to monitor the quality of all weft yarns with only one sensor.

Beim Einsatz der Erfindung in einer Luftwebmaschine wird der Garnqualitätssensor vorzugsweise nach der Hauptdüse und vor dem Fach angeordnet.When using the invention in an air-jet weaving machine, the yarn quality sensor is preferably arranged after the main nozzle and in front of the compartment.

Beim Einsatz der Erfindung in einer Projektilwebmaschine wird der Garnqualitätssensor vorzugsweise so vor dem Fach angeordnet, dass das Projektil den Messbereich des Sensors durchfliegt und den Schussfaden nach sich durch den Messbereich zieht. In diesem Fall ist z.B. eine Synchronisation mit dem Maschinenzyklus vorzusehen, um die Fehlerdetektion während dem Durchflug des Projektils durch den Messbereich zu unterdrücken.When the invention is used in a projectile weaving machine, the yarn quality sensor is preferably arranged in front of the compartment in such a way that the projectile traverses the measuring range of the sensor and pulls the weft thread through the measuring area. In this case, e.g. to provide a synchronization with the machine cycle to suppress the error detection during the passage of the projectile through the measuring range.

Claims (13)

Webmaschine mit einer Schussfadenzuführung (9) zum Zuführen mindestens eines Schussfadens in einen Übergabebereich (8) vor dem Fach (1) sowie mit einem Schussfadenantrieb (7) zum Bewegen des in den Übergabebereich (8) zugeführten Schussfadens durch das Fach (1), dadurch gekennzeichnet, dass die Webmaschine einen Garnqualitätssensor (12) aufweist, der zwischen der Schussfadenzuführung (9) und dem Fach (1) angeordnet ist.A loom having a weft supply (9) for supplying at least one weft thread in a transfer region (8) in front of the compartment (1) and with a weft thread drive (7) for moving the in the transfer region (8) supplied to the weft thread through the shed (1), characterized in that the weaving machine has a yarn quality sensor (12) which is arranged between the weft feeder (9) and the compartment (1). Webmaschine nach Anspruch 1, wobei der Garnqualitätssensor (12) ein berührungslos arbeitender Sensor ist und der Schussfaden so geführt ist, dass er den Garnqualitätssensor (12) nicht berührt.The loom of claim 1, wherein the yarn quality sensor (12) is a non-contact sensor and the weft yarn is guided so as not to contact the yarn quality sensor (12). Webmaschine nach einem der vorangehenden Ansprüche, wobei der Garnqualitätssensor (12) zur Messung des Garndurchmessers oder -querschnitts ausgestaltet ist.Weaving machine according to one of the preceding claims, wherein the yarn quality sensor (12) for measuring the yarn diameter or cross-section is configured. Webmaschine nach einem der vorangehenden Ansprüche, wobei der Garnqualitätssensor (12) ein Flusensensor ist.Weaving machine according to one of the preceding claims, wherein the yarn quality sensor (12) is a lint sensor. Webmaschine nach einem der vorangehenden Ansprüche, wobei der Garnqualitätssensor (12) eine Lichtschranke bildet, welche einen Messbereich (14) aufweist, welcher in Schussfadenrichtung (Y) kleinere Abmessung besitzt als in Kettfadenrichtung (X) und Vertikalrichtung (Z).Weaving machine according to one of the preceding claims, wherein the yarn quality sensor (12) forms a light barrier having a measuring area (14) having smaller dimension in the weft direction (Y) than in the warp direction (X) and vertical direction (Z). Webmaschine nach einem der vorangehenden Ansprüche, wobei der Garnqualitätssensor (12) einen Rahmen (13) aufweist, in welchem ein Messbereich (14) angeordnet ist, wobei der Rahmen (13) in einer Richtung senkrecht zur Schussfadenrichtung (Y) eine Öffnung (15) aufweist, durch welche der Schussfaden quer zur Schussfadenrichtung (Y) in den Messbereich (14) einführbar ist.Weaving machine according to one of the preceding claims, wherein the yarn quality sensor (12) has a frame (13) in which a measuring area (14) is arranged, wherein the frame (13) has an opening (15) in a direction perpendicular to the weft direction (Y). has, through which the weft thread transversely to the weft direction (Y) in the measuring range (14) can be inserted. Webmaschine nach einem der vorangehenden Ansprüche, wobei der Schussfadenantrieb (7) mindestens einen angetriebenen Greifer zum Ziehen des Schussfadens durch das Fach (1) aufweist.Weaving machine according to one of the preceding claims, wherein the weft drive (7) at least a driven gripper for pulling the weft thread through the tray (1). Webmaschine nach einem der vorangehenden Ansprüche, wobei die Webmaschine eine letzte, vor dem Fach (1) angeordnete Schussfadenführung (6) aufweist, um den Schussfaden in Kettfadenrichtung (X) und Vertikalrichtung (Z) bei seinem Schuss durch das Fach (1) zu führen, wobei der Garnqualitätssensor (12) zwischen der Schussfadenzuführung (9) und der Schussfadenführung (6) angeordnet ist.Weaving machine according to one of the preceding claims, wherein the weaving machine has a last, before the tray (1) arranged weft guide (6) to guide the weft yarn in the warp direction (X) and vertical direction (Z) in his shot through the tray (1) wherein the yarn quality sensor (12) is disposed between the weft feeder (9) and the weft yarn guide (6). Webmaschine nach einem der Ansprüche 1 bis 7, wobei die Webmaschine eine letzte, vor dem Fach (1) angeordnete Schussfadenführung (6) aufweist, um den Schussfaden in Kettfadenrichtung (X) und Vertikalrichtung (Z) bei seinem Schuss durch das Fach (1) zu führen, wobei der Garnqualitätssensor (12) zwischen der Schussfadenführung (6) und dem Fach (1) angeordnet ist.Weaving machine according to one of claims 1 to 7, wherein the weaving machine has a last, before the tray (1) arranged weft guide (6) to the weft yarn in the warp direction (X) and vertical direction (Z) in his shot through the compartment (1). to be guided, wherein the yarn quality sensor (12) between the weft guide (6) and the tray (1) is arranged. Webmaschine nach einem der vorangehenden Ansprüche, wobei die Schussfadenzuführung (9) ein Schussfadenwechsler ist, mit welchem jeweils mindestens einer mehrerer Schussfäden wahlweise dem Übergabebereich (8) zuführbar ist.Weaving machine according to one of the preceding claims, wherein the weft feeder (9) is a weft thread changer with which at least one of a plurality of weft threads can optionally be fed to the transfer area (8). Verfahren zum Betrieb einer Webmaschine, bei welchem der Schussfaden von einer Schussfadenzuführung (9) in einen Übergabebereich (8) vor dem Fach (1) zugeführt wird, von wo der Schussfaden von einem Schussfadenantrieb (7) durch das Fach (1) bewegt wird, dadurch gekennzeichnet, dass eine Qualität des Schussfadens von einem Garnqualitätssensor (12) zwischen der Schussfadenzuführung (9) und dem Fach (1) gemessen wird.Method for operating a weaving machine, in which the weft thread is fed from a weft feeder (9) into a transfer area (8) in front of the compartment (1), from where the weft thread is moved by a weft drive (7) through the compartment (1), characterized in that a quality of the weft yarn is measured by a yarn quality sensor (12) between the weft feeder (9) and the shed (1). Verfahren nach Anspruch 11, wobei mit dem Garnqualitätssensor (12) Flusen am Schussfaden detektiert werden.The method of claim 11, wherein the yarn quality sensor (12) lint on the weft yarn are detected. Verfahren nach einem der Ansprüche 11 oder 12, wobei der Schussfaden von einem Greifer im Übergabebereich (8) erfasst und ins Fach (1) eingetragen wird, wodurch der Schussfaden im Bereich des Garnqualitätssensors (12) seitlich in Kettfadenrichtung (X) und/oder Vertikalrichtung (Z) bewegt und in einen Messbereich (13) des Garnqualitätssensors (12) eingeführt wird.Method according to one of claims 11 or 12, wherein the weft thread is detected by a gripper in the transfer area (8) and entered into the compartment (1), whereby the weft thread in the region of the yarn quality sensor (12) is moved laterally in the warp direction (X) and / or vertical direction (Z) and inserted into a measuring range (13) of the yarn quality sensor (12).
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WO2012068697A2 (en) 2010-11-25 2012-05-31 Uster Technologies Ag A method and apparatus for controlling a jet loom
WO2012068698A2 (en) 2010-11-25 2012-05-31 Uster Technologies Ag A method and apparatus for controlling a jet loom
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