EP0885991B1 - Process for monitoring the operation of a weft feeler on air jet looms - Google Patents

Process for monitoring the operation of a weft feeler on air jet looms Download PDF

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Publication number
EP0885991B1
EP0885991B1 EP98106022A EP98106022A EP0885991B1 EP 0885991 B1 EP0885991 B1 EP 0885991B1 EP 98106022 A EP98106022 A EP 98106022A EP 98106022 A EP98106022 A EP 98106022A EP 0885991 B1 EP0885991 B1 EP 0885991B1
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EP
European Patent Office
Prior art keywords
light barrier
weft thread
weft
signal
loom
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EP98106022A
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German (de)
French (fr)
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EP0885991A1 (en
Inventor
Dieter Dipl.-Ing. Teufel (Fh)
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/3073—Detection means therefor
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the invention relates to a method for monitoring the function of an output of the Weft insertion channel of a reed arranged weft monitor with at least a first and a second light barrier, the first light barrier having the correct Entry of a weft thread in the weft insertion channel of a reed and the second light barrier has an incorrect weft insertion, e.g. one too long Detects weft or a so-called weft break and the hit Findings are transmitted by electrical signals from an evaluation device.
  • CH-PS 655 745 A5 is a method for determining a weft insertion error by means of a weft detection device arranged on a weaving machine, hereinafter referred to as weft monitor, after which a predetermined angle of rotation range per revolution of the main loom shaft is determined and the presence of a weft is determined within this angle of rotation range.
  • the shot guard monitors both a first rotation angle range in which a shot is to be detected and a second rotation angle range lying outside the first rotation angle range, a signal about the presence of a properly entered shot being generated only in the first rotation angle range while another , signal not generated by a weft thread, a so-called false signal, is also detected in the second angle range and a signal is generated there that triggers a weaving stop.
  • the signal generated in the second angle of rotation range is only perceived as a false signal when it occurs, for example, continuously over a certain number of revolutions of the main loom shaft.
  • a device for monitoring a weft thread by sensors is known from EP 0 004 836 A2.
  • the subject of this previously known document is that a monitoring device known per se with a first and a second sensor is assigned a third sensor which detects the weft thread in the event of a defect in one of the two sensors.
  • This solution is also not based on a functional check of the sensors.
  • the first light barrier can be operated in web mode by interference signals, e.g. due to cable break can come about, generate false reports in such a way that a signal for one correct weft entry is present even though the weft entry was incorrect. Such an error message or such a false signal can also occur in one Rotation angle range of the weaving machine main shaft are generated, which is not that Corresponds to the angle of rotation range in which the weft thread after its entry into the Shed has reached the first light barrier.
  • the second light barrier is only in because of rarely occurring thread breaks Take action, so give a signal when there is a weft break. A defect of the second light barrier is therefore not detectable during each weft insertion.
  • the object of the invention is therefore to provide a method for continuously monitoring the Functionality of such light barriers to create, thereby eliminating malfunctions in the course of a weaving process and consequently manufacturing of defective tissue is avoided.
  • Monitoring the functionality of the first light barrier of the weft monitor is that in a range of rotation angle ⁇ 2 of the main loom shaft, the corresponds to the angle of rotation range ⁇ 1 in which the arrival of the one Weft insertion nozzle inserted into the shed through the first Light barrier of an evaluation device is signaled, occurring faults, e.g. the Breakage of a signal line leading to the light barrier, as at least one electrical one Interference signal from the evaluation device is signaled.
  • the weaving machine drive stops the main shaft and an error message is generated, for example, on a display for the operating personnel. It is also essential to the invention that not every first interference signal resulting from the function monitoring in the rotation angle range ⁇ 2 or missing signal outside the rotation angle range ⁇ 1 must lead to a machine stop, but that more than one interference signal or missing signals can occur, and these signals by means of an algorithm for Determine the likelihood of a malfunction on the light barriers or, for example, in the course of the weaving process and only then the main drive is stopped.
  • the functionality of the second light barrier is monitored by the fact that after the weft thread has been inserted into the weft insertion channel of the reed, the second light barrier is broken when the weft thread strikes the fabric edge, that is, it is broken even if there is no weft breakage. When the second light barrier is broken, it inevitably emits a signal to the evaluation device at each weft thread stop, which is used to monitor the functionality of the second light barrier. It has proven to be advantageous if the projection of a fabric table is used as a precaution, as is known from DE-PS 38 44 510.
  • the rotation angle ranges ⁇ 1 and ⁇ 2, not shown here, of the total rotation angle of the Main loom shaft are related to one revolution of the main shaft.
  • a weft thread 7 supplied by the thread store 15 is used transported by means of the entry nozzle 11 through the entry channel 5 of a reed 4 and its arrival at the light barrier 2 of the shot guard 1 detected and as an electrical Signal S1 transmitted to a signal evaluation device 8.
  • the signal is recorded in a rotation angle range ⁇ 1 of the main loom shaft. Outside of the angle of rotation range ⁇ 1, no signals are normally generated by the light barrier 2 because the weft thread 7 cannot arrive at the light barrier 2 in this region.
  • the second light barrier 3 of the weft monitor 1 emits an electrical signal S2 to the evaluation device 8 if the weft thread 7 breaks through the light barrier 3 within the first rotation angle range ⁇ 1 of the main loom of the weaving machine. This is the case if, for example, there is a so-called broken shot.
  • the signal S2 triggers a stop of the drive 10 of the main shaft via the evaluation device 8 in the machine control 9.
  • the second light barrier 3 will only come into action owing to the rarely occurring weft breaks, that is to say emit a signal if, for example, there is a weft break.
  • a defect in the second light barrier 3, in contrast to the first light barrier 2, cannot be determined during each weft insertion.
  • a defect in the second light barrier 3 can remain undetected over a longer period of time.
  • the first light barrier 2 generates a signal S1, for example in the event of a shot break, but this signal S1 cannot be canceled by the signal S2 of the second light barrier 3.
  • a defect in the light barrier 3 will result in a weft break being interpreted as a correctly inserted weft thread by the light barrier 2, that is to say a signal S1 is generated, although the signal S2 should have been generated.
  • the second light barrier 3 is monitored for functionality according to the invention in that with each weft thread striking the binding point 13 of the fabric 14 through the reed 4, see also FIG. 2, the second light barrier 3 is broken through by a precaution outside the angle of rotation ⁇ 1 and thereby a signal S4 generated, which is different from the signal S2.
  • the fabric table 12 of which has a projection 12 ' the with each weft thread stop between the light barriers 2, 3 in the entry channel 5 immersed projection 12 'in the light barrier 3 from the signal S4, which the Loom control 9 reports the functionality of the light barrier 3.
  • the signals S3 and S4 are statistically in the Loom control 9 detected and by means of an algorithm, the probability the presence of a fault or a fault on the light barriers 2, 3 and a fault determined in the course of the weaving process by the weaving machine control 9.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

In an air jet loom including a stop motion arrangement with first and second light beam sensor devices for detecting the presence of an inserted weft thread, the functionality of the sensor devices is continuously monitored. An inserted weft thread is expected to reach the first sensor device during an angular range ( alpha 1) of one rotation of the main shaft of the loom, whereupon the first sensor device emits a weft arrival signal (S1). In the event of a weft break, the weft thread reaches the second sensor device during the angular range ( alpha 1), whereupon the second sensor device emits a weft fault signal (S2). To monitor the functionality of the first sensor device, an interference signal (S3) emitted thereby during a second angular range ( alpha 2) not corresponding to the first angular range ( alpha 1) is evaluated. To monitor the functionality of the second sensor device, its light beam is positively interrupted by a projection (12') of a machine component (12) during each weft insertion cycle as the reed beats-up the inserted weft thread. Thus, the second sensor device positively emits a test signal during each reed beat-up at a time outside of the first angular range ( alpha 1). The presence, absence or irregularities of the signals (S3) and (S4) are statistically evaluated to determine whether a loom stop is necessary.

Description

Die Erfindung betrifft ein Verfahren zur Funktionsüberwachung eines am Ausgang des Schußfadeneintragkanals eines Webblattes angeordneten Schußfadenwächters mit wenigstens einer ersten und einer zweiten Lichtschranke, wobei die erste Lichtschranke den korrekten Eintrag eines Schußfadens in den Schußfadeneintragskanal eines Webblattes feststellt und die zweite Lichtschranke einen nicht korrekten Schußfadeneintrag, z.B. einen zu langen Schußfaden oder einen sogenannten Schußfadenbruch feststellt und die getroffenen Feststellungen durch elektrische Signale einer Auswerteeinrichtung übermittelt werden.The invention relates to a method for monitoring the function of an output of the Weft insertion channel of a reed arranged weft monitor with at least a first and a second light barrier, the first light barrier having the correct Entry of a weft thread in the weft insertion channel of a reed and the second light barrier has an incorrect weft insertion, e.g. one too long Detects weft or a so-called weft break and the hit Findings are transmitted by electrical signals from an evaluation device.

Bekannt ist aus der CH-PS 655 745 A5 ein Verfahren zum Feststellen eines Schußeintragfehlers durch eine an einer Webmaschine angeordnete Schußfeststellvorrichtung, nachfolgend Schußwächter genannt, wonach ein vorbestimmter Drehwinkelbereich pro Umdrehung der Webmaschinen-Hauptwelle festgelegt und die Anwesenheit eines Schusses innerhalb dieses Drehwinkelbereiches festgestellt wird.
Durch den Schußwächter wird dabei sowohl ein erster Drehwinkelbereich, in welchem ein Schuß festgestellt werden soll, als auch ein außerhalb des ersten Drehwinkelbereiches liegender zweiter Drehwinkelbereich überwacht, wobei ein Signal über das Vorliegen eines ordnungsgemäß eingetragenen Schusses nur im ersten Drehwinkelbereich erzeugt wird, während ein anderes, nicht durch einen Schußfaden erzeugtes Signal, ein sogenanntes Fehlsignal, auch im zweiten Drehwinkelbereich erfaßt wird und dort ein Signal erzeugt wird, das einen Webstop auslöst.
Das im zweiten Drehwinkelbereich erzeugte Signal wird dabei erst dann als Fehlsignal wahrgenommen, wenn es z.B. kontinuierlich über eine bestimmte Anzahl von Umdrehungen der Webmaschinen-Hauptwelle auftritt.Known from CH-PS 655 745 A5 is a method for determining a weft insertion error by means of a weft detection device arranged on a weaving machine, hereinafter referred to as weft monitor, after which a predetermined angle of rotation range per revolution of the main loom shaft is determined and the presence of a weft is determined within this angle of rotation range.
The shot guard monitors both a first rotation angle range in which a shot is to be detected and a second rotation angle range lying outside the first rotation angle range, a signal about the presence of a properly entered shot being generated only in the first rotation angle range while another , signal not generated by a weft thread, a so-called false signal, is also detected in the second angle range and a signal is generated there that triggers a weaving stop.
The signal generated in the second angle of rotation range is only perceived as a false signal when it occurs, for example, continuously over a certain number of revolutions of the main loom shaft.

Bekannt ist aus der US-PS 4,487,235 ferner ein Verfahren und eine Vorrichtung zum Detektieren eines in ein Webfach einer Düsenwebmaschine eingetragenen Schußfadens.
Auf eine Funktionskontrolle der einzelnen Schußwächter, insbesondere des zweiten Schußwächters stellt das bekannte Verfahren nicht ab.Also known from US Pat. No. 4,487,235 is a method and a device for detecting a weft thread inserted into a shed of a jet loom.
The known method is not based on a functional check of the individual shot guard, in particular of the second shot guard.

Des weiteren ist aus der EP 0 004 836 A2 eine Einrichtung zum Überwachen eines Schußfadens durch Sensoren bekannt.
Gegenstand dieser vorbekannten Druckschrift ist, daß einer an sich bekannten Überwachungseinrichtung mit einem ersten und einem zweiten Sensor ein dritter Sensor zugeordnet ist, der im Falle eines Defekts eines der zwei Sensoren den Schußfaden detektiert. Auf eine Funktionskontrolle der Sensoren stellt auch diese Lösung nicht ab.Furthermore, a device for monitoring a weft thread by sensors is known from EP 0 004 836 A2.
The subject of this previously known document is that a monitoring device known per se with a first and a second sensor is assigned a third sensor which detects the weft thread in the event of a defect in one of the two sensors. This solution is also not based on a functional check of the sensors.

In der aus der EP 0 004 836 A2 bekannten Einrichtung, in der der Schußfadenwächter am Ausgang des Webblattes aus einer ersten und zweiten Lichtschranke besteht, ist die Überwachungsfunktion der Lichtschranken bis gegenwärtig nicht eindeutig gesichert.In the device known from EP 0 004 836 A2, in which the weft monitor at the exit of the Webblattes consists of a first and second light barrier, is the Monitoring function of the light barriers has not yet been clearly secured.

Die erste Lichtschranke kann im Webbetrieb durch Störsignale, die z.B. durch Kabelbruch zustande kommen können, Fehlmeldungen derart erzeugen, daß ein Signal für einen korrekten Schußfadeneintrag vorliegt, obwohl ein nicht korrekter Schußfadeneintrag erfolgte. Eine solche Fehlmeldung bzw. ein solches Falschsignal kann auch in einem Drehwinkelbereich der Webmaschinen-Hauptwelle erzeugt werden, der nicht dem Drehwinkelbereich entspricht, in welchem der Schußfaden nach seinem Eintrag in das Webfach die erste Lichtschranke erreicht hat.The first light barrier can be operated in web mode by interference signals, e.g. due to cable break can come about, generate false reports in such a way that a signal for one correct weft entry is present even though the weft entry was incorrect. Such an error message or such a false signal can also occur in one Rotation angle range of the weaving machine main shaft are generated, which is not that Corresponds to the angle of rotation range in which the weft thread after its entry into the Shed has reached the first light barrier.

Die zweite Lichtschranke wird aufgrund von selten auftretenden Fadenbrüchen nur dann in Aktion treten, also ein Signal abgeben, wenn ein Schußfadenbruch vorliegt. Ein Defekt der zweiten Lichtschranke ist also nicht während eines jeden Schußfadeneintrags feststellbar.The second light barrier is only in because of rarely occurring thread breaks Take action, so give a signal when there is a weft break. A defect of the second light barrier is therefore not detectable during each weft insertion.

Aufgabe der Erfindung ist es daher, ein Verfahren zum kontinuierlichen Überwachen der Funktionstüchtigkeit solcher Lichtschranken zu schaffen, wodurch Fehlfunktionen im Ablauf eines Webprozesses ausgeschlossen und folglich das Herstellen von fehlerbehaftetem Gewebe vermieden wird. The object of the invention is therefore to provide a method for continuously monitoring the Functionality of such light barriers to create, thereby eliminating malfunctions in the course of a weaving process and consequently manufacturing of defective tissue is avoided.

Erfindungsgemäß wird die Aufgabe durch die Merkmale des Patentanspruchs 1 gelöst.According to the invention the object is achieved by the features of patent claim 1.

Die Überwachung der Funktionstüchtigkeit der ersten Lichtschranke des Schußfadenwächters besteht darin, daß in einem Drehwinkelbereich α2 der Webmaschinen-Hauptwelle, der nicht dem Drehwinkelbereich α1 entspricht, in dem die Ankunft des von einer Schußfadeneintragsdüse in das Webfach eingetragenen Schußfadens durch die erste Lichtschranke einer Auswerteeinrichtung signalisiert wird, auftretende Störungen, z.B. den Bruch einer zur Lichtschranke führenden Signalleitung, als wenigstens ein elektrisches Störsignal der Auswerteeinrichtung signalisiert wird.Monitoring the functionality of the first light barrier of the weft monitor is that in a range of rotation angle α2 of the main loom shaft, the corresponds to the angle of rotation range α1 in which the arrival of the one Weft insertion nozzle inserted into the shed through the first Light barrier of an evaluation device is signaled, occurring faults, e.g. the Breakage of a signal line leading to the light barrier, as at least one electrical one Interference signal from the evaluation device is signaled.

Im Falle, daß in dem vorgenannten Drehwinkelbereich α2 eine wie auch immer geartete Störung an der ersten Lichtschranke auftritt, stoppt der Webmaschinenantrieb die Hauptwelle und eine Fehlermeldung wird z.B. auf einer Anzeige dem Bedienpersonal generiert.
Erfindungswesentlich ist ferner, daß nicht jedes erste aus der Funktionsüberwachung resultierende Störsignal in dem genannten Drehwinkelbereich α2 oder fehlende Signal außerhalb des Drehwinkelbereichs α1 zu einem Maschinenstop führen muß, sondern daß mehr als ein Störsignal oder fehlende Signale auftreten können, und diese Signale mittels eines Algorithmus zum Feststellen der Wahrscheinlichkeit einer Funktionsstörung an den Lichtschranken oder z.B. im Ablauf des Webprozesses verwendet werden und erst daraufhin der Hauptantrieb gestoppt wird.In the event that a malfunction of any kind occurs at the first light barrier in the aforementioned angle of rotation range α2, the weaving machine drive stops the main shaft and an error message is generated, for example, on a display for the operating personnel.
It is also essential to the invention that not every first interference signal resulting from the function monitoring in the rotation angle range α2 or missing signal outside the rotation angle range α1 must lead to a machine stop, but that more than one interference signal or missing signals can occur, and these signals by means of an algorithm for Determine the likelihood of a malfunction on the light barriers or, for example, in the course of the weaving process and only then the main drive is stopped.

Die Überwachung der Funktionstüchtigkeit der zweiten Lichtschranke erfolgt dadurch, daß nach dem Eintragen des Schußfadens in den Schußeintragskanal des Webblattes beim Anschlagen des Schußfadens an die Gewebekante die zweite Lichtschranke durchbrochen wird, also auch dann durchbrochen wird, wenn kein Schußfadenbruch vorliegt.
Mit dem Durchbrechen der zweiten Lichtschranke gibt diese zwangsläufig bei jedem Schußfadenanschlag ein Signal an die Auswerteeinrichtung ab, das zur Überwachung der Funktionstüchtigkeit der zweiten Lichtschranke verwendet wird.
Als vorteilhaft hat sich erwiesen, wenn als Vorkehrungen der Vorsprung eines Gewebetisches verwendet wird, wie dieser aus der DE-PS 38 44 510 bekannt ist. The functionality of the second light barrier is monitored by the fact that after the weft thread has been inserted into the weft insertion channel of the reed, the second light barrier is broken when the weft thread strikes the fabric edge, that is, it is broken even if there is no weft breakage.
When the second light barrier is broken, it inevitably emits a signal to the evaluation device at each weft thread stop, which is used to monitor the functionality of the second light barrier.
It has proven to be advantageous if the projection of a fabric table is used as a precaution, as is known from DE-PS 38 44 510.

Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsbeispiele erläutert.The invention is described below with reference to the drawing Exemplary embodiments explained.

Es zeigen:

Figur 1
eine schematische Darstellung der erfindungswesentlichen Elemente der Webmaschine in der Draufsicht und
Figur 2
eine Schnittdarstellung gemäß der Linie I-I in Figur 1.
Show it:
Figure 1
a schematic representation of the essential elements of the weaving machine according to the invention in plan view and
Figure 2
2 shows a sectional illustration along line II in FIG. 1.

Die hier nicht dargestellten Drehwinkelbereiche α1 und α2 des Gesamtdrehwinkels der Webmaschinen-Hauptwelle sind auf eine Umdrehung der Hauptwelle bezogen.The rotation angle ranges α1 and α2, not shown here, of the total rotation angle of the Main loom shaft are related to one revolution of the main shaft.

Im normalen Webbetrieb wird ein von dem Fadenspeicher 15 gelieferter Schußfaden 7 mittels der Eintragsdüse 11 durch den Eintragskanal 5 eines Webblattes 4 transportiert und dessen Ankunft an der Lichtschranke 2 des Schußwächters 1 erfaßt und als elektrisches Signal S1 einer Signalauswerteeinrichtung 8 übermittelt.In normal weaving operation, a weft thread 7 supplied by the thread store 15 is used transported by means of the entry nozzle 11 through the entry channel 5 of a reed 4 and its arrival at the light barrier 2 of the shot guard 1 detected and as an electrical Signal S1 transmitted to a signal evaluation device 8.

Die Signalerfassung erfolgt dabei in einem Drehwinkelbereich α1 der Webmaschinen-Hauptwelle.
Außerhalb des Drehwinkelbereiches α1 werden von der Lichtschranke 2 im Normalfall keine Signale erzeugt, weil in diesem Bereich der Schußfaden 7 nicht an der Lichtschranke 2 ankommen kann.The signal is recorded in a rotation angle range α1 of the main loom shaft.
Outside of the angle of rotation range α1, no signals are normally generated by the light barrier 2 because the weft thread 7 cannot arrive at the light barrier 2 in this region.

Eine auftretende Störung an der Lichtschranke 2, z.B. durch Bruch der Signalleitung zur Übertragung des Signals S1, löst im Drehwinkelbereich α2 ein Signal aus. Dieses Signal wird mit S3 bezeichnet. Da aber das Signal S3 unterschiedlich zum Signal S1 ist, wird dieses nicht unmittelbar nach dessen Erzeugung zum Auslösen eines Webstops verwendet, wie später noch erläutert werden wird.An occurring fault on the light barrier 2, e.g. by breaking the signal line to Transmission of the signal S1 triggers a signal in the rotation angle range α2. This signal will designated S3. However, since signal S3 is different from signal S1, this will not used to trigger a web stop immediately after its creation, as later will be explained later.

Die zweite Lichtschranke 3 des Schußwächters 1 gibt an die Auswerteeinrichtung 8 ein elektrisches Signal S2 ab, wenn innerhalb des ersten Drehwinkelbereiches α1 der Webmaschinen-Hauptwelle der Schußfaden 7 die Lichtschranke 3 durchbricht.
Das ist dann der Fall, wenn z.B. ein sogenannter Schußbruch vorliegt.
Das Signal S2 löst über die Auswerteeinrichtung 8 in der Maschinensteuerung 9 einen Stop des Antriebes 10 der Hauptwelle aus.
Die zweite Lichtschranke 3 wird aber, wie bereits eingangs erwähnt, aufgrund von selten auftretenden Schußfadenbrüchen nur dann in Aktion treten, also ein Signal abgeben, wenn z.B. ein Schußbruch vorliegt.
Ein Defekt der zweiten Lichtschranke 3 ist also, im Gegensatz zur ersten Lichtschranke 2, nicht während eines jeden Schußeintrags feststellbar. Insofern kann ein Defekt an der zweiten Lichtschranke 3 über einen längeren Zeitraum unerkannt bleiben. Die Folge ist, daß z.B. bei einem Schußbruch die erste Lichtschranke 2 ein Signal S1 erzeugt, dieses Signal S1 jedoch nicht durch das Signal S2 der zweiten Lichtschranke 3 aufgehoben werden kann. Insofern wird ein Defekt an der Lichtschranke 3 dazu führen, daß ein Schußbruch als ein korrekt eingetragener Schußfaden durch die Lichtschranke 2 interpretiert wird, also ein Signal S1 erzeugt wird, obwohl das Signal S2 hätte erzeugt werden müssen. Dadurch bleiben Schußfehler im Gewebe zunächst unerkannt.
Hier setzt die Erfindung an.
Die zweite Lichtschranke 3 wird erfindungsgemäß dadurch auf Funktionstüchtigkeit überwacht, daß mit jedem Schußfadenanschlagen an den Bindepunkt 13 des Gewebes 14 durch das Webblatt 4, siehe auch Figur 2, die zweite Lichtschranke 3 durch eine Vorkehrung außerhalb des Drehwinkels α1 durchbrochen wird und dadurch ein Signal S4 erzeugt, das unterschiedlich zu dem Signal S2 ist.The second light barrier 3 of the weft monitor 1 emits an electrical signal S2 to the evaluation device 8 if the weft thread 7 breaks through the light barrier 3 within the first rotation angle range α1 of the main loom of the weaving machine.
This is the case if, for example, there is a so-called broken shot.
The signal S2 triggers a stop of the drive 10 of the main shaft via the evaluation device 8 in the machine control 9.
However, as already mentioned at the beginning, the second light barrier 3 will only come into action owing to the rarely occurring weft breaks, that is to say emit a signal if, for example, there is a weft break.
A defect in the second light barrier 3, in contrast to the first light barrier 2, cannot be determined during each weft insertion. In this respect, a defect in the second light barrier 3 can remain undetected over a longer period of time. The result is that the first light barrier 2 generates a signal S1, for example in the event of a shot break, but this signal S1 cannot be canceled by the signal S2 of the second light barrier 3. In this respect, a defect in the light barrier 3 will result in a weft break being interpreted as a correctly inserted weft thread by the light barrier 2, that is to say a signal S1 is generated, although the signal S2 should have been generated. As a result, weft defects in the tissue initially go undetected.
This is where the invention comes in.
The second light barrier 3 is monitored for functionality according to the invention in that with each weft thread striking the binding point 13 of the fabric 14 through the reed 4, see also FIG. 2, the second light barrier 3 is broken through by a precaution outside the angle of rotation α1 and thereby a signal S4 generated, which is different from the signal S2.

Bei einer Luftdüsenwebmaschine, deren Gewebetisch 12 einen Vorsprung 12' besitzt, löst der bei jedem Schußfadenanschlag zwischen die Lichtschranken 2,3 in den Eintragskanal 5 eintauchende Vorsprung 12' in der Lichtschranke 3 das Signal S4 aus, das der Webmaschinensteuerung 9 die Funktionstüchtigkeit der Lichtschranke 3 mitteilt.In an air jet loom, the fabric table 12 of which has a projection 12 ', the with each weft thread stop between the light barriers 2, 3 in the entry channel 5 immersed projection 12 'in the light barrier 3 from the signal S4, which the Loom control 9 reports the functionality of the light barrier 3.

Im Hinblick auf das Auslösen eines Webstops durch das Signal S3 bei einer im Drehwinkelbereich α2 auftretenden Störung an der ersten Lichtschranke 2 und bei einem im Webprozeß an der Lichtschranke 3 nicht erzeugten Signal S4 außerhalb des Drehwinkelbereiches α1 werden die Signale S3 und S4 statistisch in der Webmaschinensteuerung 9 erfaßt und mittels eines Algorithmus wird die Wahrscheinlichkeit des Vorliegens eines Fehlers bzw. einer Störung an den Lichtschranken 2,3 und einer Störung im Ablauf des Webprozesses durch die Webmaschinensteuerung 9 festgestellt. With regard to triggering a web stop by signal S3 at an im Angle of rotation range α2 occurring on the first light barrier 2 and in a Weaving process at the light barrier 3 not generated signal S4 outside of Angle of rotation range α1, the signals S3 and S4 are statistically in the Loom control 9 detected and by means of an algorithm, the probability the presence of a fault or a fault on the light barriers 2, 3 and a fault determined in the course of the weaving process by the weaving machine control 9.

ZEICHNUNGS-LEGENDEDRAWING LEGEND

0101
SchußfadenwächterWeft guard
0202
LichtschrankePhotoelectric barrier
0303
LichtschrankePhotoelectric barrier
0404
WebblattReed
0505
EintragskanalEntry channel
0606
LuftdüsenwebmaschineAir jet loom
0707
SchußfadenWeft
0808
AuswerteeinrichtungEvaluation device
0909
WebmaschinensteuerungWeaving machine control
1010th
Antriebdrive
1111
EintragsdüseEntry nozzle
1212th
GewebetischFabric table
12'12 '
Vorsprunghead Start
1313
BindepunktTie point
1414
Gewebetissue
1515
FadenspeicherThread storage
1616
SpuleKitchen sink
1717th
KettfadenWarp thread
1818th
SchwingbewegungSwinging motion
S0S0
elektr. Signalelectr. signal
S1S1
elektr. Signalelectr. signal
S2S2
elektr. Signalelectr. signal
S3S3
elektr. Signalelectr. signal
S4S4
elektr. Signalelectr. signal

Claims (3)

  1. Method for the continuous monitoring of the operation of light barriers of a weft thread stop motion (1) which is arranged at the outlet of the weft thread inlet channel (5) of a weaving reed (4) of an air-jet loom (6), the weft thread stop motion (1) having at least a first light barrier (2) and a second light barrier (3), wherein
    a) the first light barrier (2) signals a correct entry of the weft thread by means of an electrical signal (S1) to an evaluation device (8) within a rotational angle range α1 per rotation of the loom main shaft,
    b) the second light barrier (3) signals an incorrect entry of the weft thread by means of an electrical signal (S2) to the evaluation device (8) within the rotational angle range α1,
    c) evaluated signals in accordance with the features a) and b) are signalled to a loom control (9) which disconnects the drive (10) of the loom main shaft by a signal (S0) as a function of the evaluation result, characterised in that
    d) electrical malfunction signals (S3), generated by the first light barrier (2) within a rotational angle range α2, which is not the rotational angle range for the arrival of the weft thread at the first light barrier (2), of the loom main shaft are recorded in the evaluation device and at first suppressed,
    e) one electrical signal (S4) is inevitably generated per weft thread stop by the second light barrier (3) outside the rotational angle range α1 and
    f) the malfunction signals (S3) of the first light barrier (2) in the rotational angle range α2 and non-appearing signals (S4), which are inevitably generated, of the second light barrier (3) outside the rotational angle range α1 are recorded statistically in the loom control (9) and are not considered to be the signal (S0) for disconnecting the drive (10) until the probability of the presence of a malfunction at the light barriers (2, 3) and a malfunction in the sequence of the weaving process has been established by means of an algorithm by the loom control (9).
  2. Method according to claim 1, characterised in that the electrical signal (S4) of the light barrier (3) is actuated by a loom component that is securely fixed to the machine.
  3. Method according to claim 2, characterised in that the projection (12') of a fabric table (12) is used as the component that is securely fixed to the machine.
EP98106022A 1997-04-21 1998-04-02 Process for monitoring the operation of a weft feeler on air jet looms Expired - Lifetime EP0885991B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19716587A DE19716587C1 (en) 1997-04-21 1997-04-21 On=line supervisory control for weft monitoring system of air jet loom
DE19716587 1997-04-21

Publications (2)

Publication Number Publication Date
EP0885991A1 EP0885991A1 (en) 1998-12-23
EP0885991B1 true EP0885991B1 (en) 2000-11-29

Family

ID=7827140

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Application Number Title Priority Date Filing Date
EP98106022A Expired - Lifetime EP0885991B1 (en) 1997-04-21 1998-04-02 Process for monitoring the operation of a weft feeler on air jet looms

Country Status (7)

Country Link
US (1) US6014991A (en)
EP (1) EP0885991B1 (en)
JP (1) JP3263026B2 (en)
AT (1) ATE197824T1 (en)
DE (2) DE19716587C1 (en)
ES (1) ES2154066T3 (en)
PT (1) PT885991E (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010044127B3 (en) * 2010-11-18 2011-12-29 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Gripper head for the entry of weft threads on a rapier loom and a rapier loom with such a gripper head
JP5592239B2 (en) * 2010-11-29 2014-09-17 津田駒工業株式会社 Sub nozzle injection period setting method for air jet loom
JP6372229B2 (en) 2014-08-04 2018-08-15 株式会社豊田自動織機 Weft detection device in jet loom

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH485054A (en) * 1968-10-10 1970-01-31 Sulzer Ag Optical weft thread monitor for a weaving machine
US4041985A (en) * 1975-05-07 1977-08-16 Nissan Motor Company, Limited Weft sensor system of sensing malfunction of a weaving loom
JPS5750303Y2 (en) * 1978-04-04 1982-11-04
JPS5668142A (en) * 1979-11-07 1981-06-08 Toyoda Automatic Loom Works Accident detecting method of weft yarn detector in loom
JPS58208446A (en) * 1982-05-31 1983-12-05 津田駒工業株式会社 Weft yarn detection for jet loom
EP0108183B1 (en) * 1982-11-08 1986-09-10 GebràœDer Sulzer Aktiengesellschaft Weaving machine
KR910003227B1 (en) * 1987-03-16 1991-05-24 쯔다고마 고오교오 가부시끼가이샤 Method for judging replacemnet of bobbin
DE3821725A1 (en) * 1988-04-07 1989-10-26 Dornier Gmbh Lindauer AIR WAVING MACHINE
DE3844510A1 (en) * 1988-04-07 1989-12-28 Dornier Gmbh Lindauer Air-jet weaving machine
JPH0533246A (en) * 1991-07-30 1993-02-09 Tsudakoma Corp Weft-detection apparatus for loom
DE19602513C1 (en) * 1996-01-25 1996-10-02 Dornier Gmbh Lindauer Monitoring functioning of magnetic valves in looms
DE19611320C2 (en) * 1996-03-22 1999-05-20 Dornier Gmbh Lindauer Method and device for pneumatically supporting the insertion and tensioning of a weft thread in weaving machines

Also Published As

Publication number Publication date
EP0885991A1 (en) 1998-12-23
DE19716587C1 (en) 1998-09-03
US6014991A (en) 2000-01-18
ES2154066T3 (en) 2001-03-16
JPH10317261A (en) 1998-12-02
ATE197824T1 (en) 2000-12-15
JP3263026B2 (en) 2002-03-04
DE59800353D1 (en) 2001-01-04
PT885991E (en) 2001-04-30

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