EP1163384A2 - Method for optimizing and monitoring weft insertion in power looms - Google Patents

Method for optimizing and monitoring weft insertion in power looms

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Publication number
EP1163384A2
EP1163384A2 EP00922537A EP00922537A EP1163384A2 EP 1163384 A2 EP1163384 A2 EP 1163384A2 EP 00922537 A EP00922537 A EP 00922537A EP 00922537 A EP00922537 A EP 00922537A EP 1163384 A2 EP1163384 A2 EP 1163384A2
Authority
EP
European Patent Office
Prior art keywords
weft
thread
yarn
weft insertion
force
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00922537A
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German (de)
French (fr)
Other versions
EP1163384B1 (en
Inventor
Urs Meyer
Ivan Castelli
Leonardo Fogu
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.)
Iropa AG
Original Assignee
Iro Patent AG
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Application filed by Iro Patent AG filed Critical Iro Patent AG
Publication of EP1163384A2 publication Critical patent/EP1163384A2/en
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
    • D03J1/00—Auxiliary apparatus combined with or associated with looms
    • D03J1/005—Displays or displaying data
    • 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 weft insertion is determined by a permanently entered program and monitored with mechanical, capacitive, t ⁇ boelekt ⁇ schen or optoeiekt ⁇ schen thread watchers.
  • mechanical, capacitive, t ⁇ boelekt ⁇ schen or optoeiekt ⁇ schen thread watchers To ensure a reliable response of the sensors to thread breakage, they have to react relatively slowly, that is means with a response time in the order of magnitude of 10 ms or more.
  • the course of the thread movement during weft insertion from weft to weft can be determined at most approximately by measuring the response times of different sensors arranged in the thread path. A continuous measurement and monitoring of the thread movement during weft insertion is therefore impossible It is also not possible to optimize the course of the weft insertion, for example by specifically controlling the air nozzles in the air nozzle weaving machine.
  • the measurement of the tensile force on the weft thread is occasionally carried out experimentally for scientific purposes.
  • the sensors used use strain gauges as mechanical-electrical transducers
  • the sensitivity, the overload capability and the limit frequency are limited by the materials used so that only carefully prepared laboratory measurements on individual weft insertion cycles can be carried out, and this only with particularly robust yarns that can withstand the additional stress caused by the deflection points of the sensor.
  • the aim of the present invention is to use a cost-effective, robust, accurate and fast-reacting sensor to measure the thread force during the weft insertion and thus to better optimize and monitor the course of the weft insertion better and to monitor it more reliably than 45 degrees, preferably less than 30 degrees
  • the limit frequency of the sensor is above 1 kHz, preferably above 5 kHz.
  • This sensor is preferably implemented with a piezoresistive or piezoelectric crystal.
  • a force sensor from Honeywell, type PK 88870 is used for this purpose This is used in conjunction with a DC voltage booster with a cutoff frequency of at least 1 kHz, preferably above 5 kHz.
  • a force sensor from the Kistler range is used in conjunction with a charge booster In die In this case, a quasi-static output signal is generated by resetting the amplifier in the power-free phase of the entry cycle. The details of the piezoelectric measuring method are described in detail in the Kistler sales documentation
  • FIG. 1 shows the schematic relationship of the means according to the method
  • FIG. 2 shows the thread force signal
  • FIG. 3 shows the procedure for monitoring the weft insertion
  • FIG. 4 shows the principles for optimizing the weft insertion
  • the principle of the measuring device is shown schematically in FIG. 1.
  • the weft thread 1 is drawn off the bobbin 2 with the aid of the weft thread store 3. It then passes through a thread brake 4 and the thread force sensor 5 according to the invention.
  • the force acting on the weft thread is measured in a known manner by deflecting the thread by converting the reaction force 7 of the thread from the pressure-sensitive element 6 into an electrical signal 13.
  • the weft thread then passes through the so-called color selector, which ensures the assignment of different weft threads for the weft insertion.
  • the thread in element 9 is accelerated and driven further This element has different shapes depending on the type of weaving machine.
  • It can be a projectile or a gripper, or the main nozzle and the following relay nozzles of an air-jet weaving machine, or the injector of a water jet weaving machine.
  • the force measuring element 6 can be built on a plate 5 provided with thread guides or can be integrated into the thread already present on the machine in such a way that the desired force component is generated on it. In any case, it is arranged in the thread path after the brake 4, but before entering the shed 11, at Air and water looms in front of the main nozzle 9
  • the electrical signal 13 supplied by the thread force sensor 5 is electronically amplified in the evaluation unit 14, evaluated and sent as a signal 15 to a display 16 which informs the operator of the course of the weft insertion and draws his attention to faults and corrections thereto.
  • the evaluation unit 14 stands for this via the data line 17 in connection with the machine control 19, from where it receives the time signals of further machine functions involved in the weft insertion, for example the current angular position of the main shaft of the machine.
  • the machine control receives the monitoring signals of the thread force evaluation, for example, via the data line 18 for immediate stopping in the event of a thread break during weft insertion, or for activating a machine-related alarm means in the event of a malfunction that requires operator intervention
  • the shape of the signal 13 is shown in its time course in FIG. 2 using the example of an air-jet weaving machine.
  • the diagram shows the thread tension in the vertical axis 20, the time in section 22 in the horizontal axis 21, outside the actual weft insertion process, the thread is not under Train at time 23, the thread is accelerated and enters the shed.This leads to a rapid increase in the thread force. In time segment 24, the thread runs into the shed. At time 25, the length of the thread predetermined by the pre-cleaning unit 3 is stopped by this, resulting in a typical force peak. The thread remains selected afterwards. rend the time period 26 until at 27 the reed strikes the thread on the tissue and again generates a characteristic force peak. The thread is then cut on both sides by the scissors 10 and 12, the thread force disappears and the cycle begins again
  • the force signal with interference-free weft insertion is shown analogously to FIG. 2.
  • the monitoring of such a signal course over certain time periods is part of the known state of the art in digital signal processing, in analog form
  • the signal supplied by the sensor is digitized in time intervals of at most 10 ms, preferably less than 1 ms, and compared with the limit values assigned to the relevant time step.
  • These limit values can be entered by the user of the machine on the basis of yarn data or empirical values, or by Evaluation device itself can be determined during practical use according to the principle of adaptive control.
  • a so-called teach-in by the operator is also provided.
  • Schhesslich is also provided, based on the operating experience of the thread force for each n Time step to form the mean and thus define a pattern course.Each individual weft entry is compared with this pattern course, and if a specified tolerance is exceeded, an alarm is triggered or the machine is stopped.A decisive advantage is that the force curve leading to the stop is then used for diagnosis is available by the operator and can be compared with the image that the machine itself offers
  • the limit values are, for example, the maximum tensile force 30 when the yarn is being drawn in. This tensile force is limited to a certain value due to the simultaneous acceleration of the game, which is generally lower than that when the game is stopped throughout A minimal thread force 31 is to be monitored in order to immediately recognize thread breaks. Finally, the peak load of the yarn when stopping 32 is to be monitored.
  • This force peak is, on the other hand, a characteristic of the successfully implemented weft insertion, and is in turn also monitored with a minimum value 33 the timing, given by the position of the force peaks 23, 25 and 27, is to be monitored in an analog manner by the control system. This function is not shown here because it is handled in the same way as the monitoring of the arrival of the line in the area of the Scissors 12 (Fig 1) with an optical sensor
  • the design of the method for optimizing the weft insertion is shown in FIG. 4.
  • the thread force is shown in the vertical axis 20.
  • the horizontal axis 40 is not divided here in time, but in sections 41 of the weaving cycle, which correspond to a certain number of degrees of angularity of the main shaft of the weaving machine the assignment of certain effects during weft insertion to the control functions of the weaving machine can be recognized.
  • the normal force curve 42 is numerically determined by averaging a number of entry cycles and is shown in color on the screen (dotted here).
  • Deviations of individual cycles that lead to the machine stopping are deviated from it particularly clearly identified.
  • Automatic error diagnosis immediately indicates the type of error, as is already done in a simple manner with alphanumeric displays on the weaving machines, but only to a very limited extent, e.g. with the Differentiate between weft and warp defects
  • the display draws attention to unfavorable setting values, for example excessive force peaks 45 in the area of the thread stopping.
  • the arrow 46 clearly indicates the sensitive area, which is indicated by a changed setting is to be remedied, for example, by slowing down the weft insertion by reducing the pressure at the relay nozzles

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Abstract

A method for monitoring the cycle of the weft insertion into a weaving machine. The weft yarn passes a yarn brake and a yarn force sensor and the force acting on the weft yarn is measured in a known fashion and the reaction force of the yarn is converted by a pressure sensitive element into an electrical signal. The electrical signal outputted by the yarn force sensor is electronically amplified in an evaluation unit, is evaluated and is transmitted to an indicator informing the operator of the development of the weft insertion and of disturbances and corrections. For this purpose, the evaluation unit is connected via a data line with a machine control unit. Evaluation unit is supplied with time signals from the machine control unit associated with further machine functions participating at the weft insertion, e.g. the momentary angular position of the main shaft of the machine. The machine control unit receives monitoring signals of the yarn force evaluation via the data line, e.g. for immediate stoppage in case of a yarn breakage occurring during the weft insertion, or to activate a machine related alarm system in case of a disturbance needing the interference by an operator.

Description

Verfahren zum Optimieren und Überwachen des Schusseintrages auf Webmaschinen Process for optimizing and monitoring weft insertion on weaving machines
Bei den bekannten Webmaschinen wird der Schusseintrag in seinem Ablauf von einem fest eingegebenem Programm bestimmt und mit mechanischen, kapazitiven, tπ- boelektπschen oder optoeiektπschen Fadenwachtem überwacht Um ein zuverlässiges Ansprechen der Sensoren auf Fadenbruch sicher zu stellen, müssen diese ver- haltnismassig langsam reagieren, das heisst mit einer Ansprechzeit in der Grossenordnung von 10 ms oder mehr Der Verlauf der Fadenbewegung beim Schusseintrag von Schuss zu Schuss lasst sich damit höchstens annähernd durch Messung der Ansprechzeitpunkte verschiedener, im Fadenlauf angeordneter Sensoren bestimmen Eine kontinuierliche Messung und Überwachung der Fadenbewegung beim Schusseintrag ist damit ausgeschlossen Auch eine Optimierung des Verlaufes des Schusseintrages, beispielsweise über die gezielte Ansteuerung der Luftdusen bei der Luftdusenwebmaschiπe, ist damit nicht möglich Ebenso ist es schwierig, Schwierigkeiten beim Schusseintrag frühzeitig zu erkennen Das zuverlässige Stoppen der Webmaschine bei Schussstorungen ist aber Voraussetzung, um Webfehler zu vermeiden Vielfach werden deshalb die bestehenden Sensoren so empfindlich eingestellt, dass sie im Zweifelsfall die Maschine stoppen Dies fuhrt aber zu einem vermehrten Bedarf an BedienungseingriffenIn the case of the known weaving machines, the weft insertion is determined by a permanently entered program and monitored with mechanical, capacitive, tπboelektπschen or optoeiektπschen thread watchers. To ensure a reliable response of the sensors to thread breakage, they have to react relatively slowly, that is means with a response time in the order of magnitude of 10 ms or more. The course of the thread movement during weft insertion from weft to weft can be determined at most approximately by measuring the response times of different sensors arranged in the thread path. A continuous measurement and monitoring of the thread movement during weft insertion is therefore impossible It is also not possible to optimize the course of the weft insertion, for example by specifically controlling the air nozzles in the air nozzle weaving machine. It is also difficult to recognize difficulties in the weft insertion at an early stage However, reliable stopping of the weaving machine in the event of weft disturbances is a prerequisite to avoid weaving errors. For this reason, the existing sensors are often set so sensitively that they stop the machine in case of doubt. However, this leads to an increased need for operator intervention
Die Messung der Zugkraft auf dem Schussfaden wird gelegentlich zu wissenschaftlichen Zwecken experimentell durchgeführt Die dabei eingesetzten Sensoren benutzen Dehnmessstreifen als mechanisch-elektrische Wandler Die Empfindlichkeit, die Uberlastfahigkeit und die Grenzfrequenz sind dabei durch die eingesetzten Werkstoffe derart begrenzt, dass nur sorgfaltig vorbereitete Labormessungen an einzelnen Schusseintragszyklen durchgeführt werden können, und dies nur mit besonders robusten Garnen, welche die zusätzliche Beanspruchung durch die Umlenkstellen des Sensors aushalten Ein Einsatz dieses Messverfahrens in der industriellen Produktion kommt deshalb, und weiter auch wegen der begrenzten Lebensdauer, der anspruchsvollen Handhabung und der hohen Kosten dieser experimentellen Gerate, nicht in Frage Die vorliegende Erfindung hat zum Ziel, mit einem kostengünstigen, robusten, genauen und rasch reagierenden Sensor die Fadenkraft beim Schusseintrag zu messen und damit den Verlauf des Schusseintrages besser zu optimieren und zuverlässiger zu überwachen Der Sensor beruht auf dem Prinzip einer Fadenumlenkung, wobei der Umlenkwinkel weniger als 45 Grad, bevorzugt weniger als 30 Grad betragt Die Grenzfrequenz des Sensors liegt über 1 kHz, bevorzugt über 5 kHz Dieser Sensor wird bevorzugt mit einem piezoresistiven oder piezoelektrischen Kristall realisiert Für das piezoresisitive Messprinzip wird dazu beispielsweise ein Kraftsensor der Firma Honeywell Typ PK 88870 benutzt Dieser wird in Verbindung mit einem Gleichspan- πungsverstarker mit einer Greπzfrequenz von mindestens 1 kHz, bevorzugt über 5 kHz, eingesetzt Für das piezoelektrische Messprinzip wird beispielsweise ein Kraftsensor aus dem Programm der Firma Kistler eingesetzt, in Verbindung mit einem La- dungsverstarker In diesem Fall wird ein quasistatisches Ausgangssignal erzeugt, indem der Verstarker jeweils in der kraftfreien Phase des Eintragszyklus zurückgestellt wird Die Einzelheiten des piezoelektrischen Messverfahrens sind in der Verkaufsdo- kumentatioπ der Firma Kistler ausführlich beschriebenThe measurement of the tensile force on the weft thread is occasionally carried out experimentally for scientific purposes.The sensors used use strain gauges as mechanical-electrical transducers The sensitivity, the overload capability and the limit frequency are limited by the materials used so that only carefully prepared laboratory measurements on individual weft insertion cycles can be carried out, and this only with particularly robust yarns that can withstand the additional stress caused by the deflection points of the sensor. This measurement method is therefore used in industrial production, and also because of the limited service life, the demanding handling and the high cost of this experimental process Devices, out of the question The aim of the present invention is to use a cost-effective, robust, accurate and fast-reacting sensor to measure the thread force during the weft insertion and thus to better optimize and monitor the course of the weft insertion better and to monitor it more reliably than 45 degrees, preferably less than 30 degrees The limit frequency of the sensor is above 1 kHz, preferably above 5 kHz.This sensor is preferably implemented with a piezoresistive or piezoelectric crystal. For the piezoresistive measuring principle, a force sensor from Honeywell, type PK 88870, is used for this purpose This is used in conjunction with a DC voltage booster with a cutoff frequency of at least 1 kHz, preferably above 5 kHz. For the piezoelectric measuring principle, for example, a force sensor from the Kistler range is used in conjunction with a charge booster In die In this case, a quasi-static output signal is generated by resetting the amplifier in the power-free phase of the entry cycle. The details of the piezoelectric measuring method are described in detail in the Kistler sales documentation
In Fig 1 ist der schematische Zusammenhang der verfahrensgemassen Mittel, in Fig 2 das Fadenkraftsignal dargestellt Fig 3 zeigt die verfahreπsgemasse Anwendung zur Überwachung des Schusseintrages, und Fig 4 die Prinzipien für die Optimierung des Schusseintrages1 shows the schematic relationship of the means according to the method, FIG. 2 shows the thread force signal. FIG. 3 shows the procedure for monitoring the weft insertion, and FIG. 4 shows the principles for optimizing the weft insertion
Das Prinzip der Messeinrichtung ist in Fig 1 schematisch dargestellt Der Schussfaden 1 wird von der Spule 2 mit Hilfe des Schussfadenspeichers 3 abgezogen Hierauf durchlauft er eine Fadenbremse 4 und den erfindungsgemassen Fadenkraftsensor 5 Die auf den Schussfaden wirkende Kraft wird auf bekannte Weise durch Auslenkung des Fadens gemessen, indem die Reaktionskraft 7 des Fadens vom druckempfindlichen Element 6 in ein elektrisches Signal 13 umgewandelt wird Hierauf durchlauft der Schussfaden den sogenannten Farbwahler, der die Zuordnung unterschiedlicher Schussfaden für den Schusseintrag besorgt Für den eigentlichen Schusseintrag wird der Faden im Element 9 beschleunigt und weiter angetrieben Dieses Element hat je nach Art der Webmaschine verschiedene Gestalt Es kann sich um ein Projektil oder um einen Greifer handeln oder um die Hauptduse und die folgenden Stafettendusen einer Luftwebmaschine, oder um den Injektor einer Wasser- strahlwebmaschine Beim Schusseintrag durchlauft der Faden nun das zwischen den Scheren 10 und 12 liegende Webfach 11The principle of the measuring device is shown schematically in FIG. 1. The weft thread 1 is drawn off the bobbin 2 with the aid of the weft thread store 3. It then passes through a thread brake 4 and the thread force sensor 5 according to the invention. The force acting on the weft thread is measured in a known manner by deflecting the thread by converting the reaction force 7 of the thread from the pressure-sensitive element 6 into an electrical signal 13. The weft thread then passes through the so-called color selector, which ensures the assignment of different weft threads for the weft insertion. For the actual weft insertion, the thread in element 9 is accelerated and driven further This element has different shapes depending on the type of weaving machine. It can be a projectile or a gripper, or the main nozzle and the following relay nozzles of an air-jet weaving machine, or the injector of a water jet weaving machine. When the weft is inserted, the thread now runs between the scissors 10 and 12 lying shed 11
Das Kraftmesselement 6 kann auf eine mit Fadenfuhrern versehene Platte 5 aufgebaut oder so in den maschinenseits bereits vorhandenen Fadeniauf integriert werden, dass die gewünschte Kraftkomponente darauf erzeugt wird Es ist im Fadenlauf jedenfalls nach der Bremse 4, jedoch vor dem Eintritt ins Webfach 11 angeordnet, bei Luft- und Wasserwebmaschinen vor der Hauptduse 9The force measuring element 6 can be built on a plate 5 provided with thread guides or can be integrated into the thread already present on the machine in such a way that the desired force component is generated on it. In any case, it is arranged in the thread path after the brake 4, but before entering the shed 11, at Air and water looms in front of the main nozzle 9
Das vom Fadenkraftsensor 5 gelieferte elektπsche Signal 13 wird in der Auswerteein- heit 14 elektronisch verstärkt, ausgewertet und als Signal 15 auf eine Anzeige 16 gegeben, welche den Bediener über den Verlauf des Schusseintrages orientiert und ihn auf Störungen und Korrekturen dazu aufmerksam macht Die Auswerteeiπheit 14 steht dazu über die Datenleitung 17 in Verbindung mit der Maschinensteuerung 19, von wo sie die Zeitsignale weiterer, am Schusseintrag beteiligter Maschinenfunktionen erhalt, beispielsweise die momentane Winkellage der Hauptwelle der Maschine Andererseits erhalt die Maschinensteuerung über die Datenleitung 18 die Uberwa- chungssignale der Fadenkraftauswertung, beispielsweise zum sofortigen Stillsetzen im Falle eines Fadenbruches beim Schusseintrag, oder zum Aktivieren eines maschinenbezogenen Alarmmittels im Falle einer Störung, welche einen Bedienereingriff verlangtThe electrical signal 13 supplied by the thread force sensor 5 is electronically amplified in the evaluation unit 14, evaluated and sent as a signal 15 to a display 16 which informs the operator of the course of the weft insertion and draws his attention to faults and corrections thereto. The evaluation unit 14 stands for this via the data line 17 in connection with the machine control 19, from where it receives the time signals of further machine functions involved in the weft insertion, for example the current angular position of the main shaft of the machine. On the other hand, the machine control receives the monitoring signals of the thread force evaluation, for example, via the data line 18 for immediate stopping in the event of a thread break during weft insertion, or for activating a machine-related alarm means in the event of a malfunction that requires operator intervention
Die Form des Signals 13 ist in ihrem zeitlichen Verlauf in Fig 2 am Beispiel einer Luftwebmaschine dargestellt Das Diagramm zeigt in der vertikalen Achse 20 den Fadenzug, in der horizontalen Achse 21 die Zeit im Abschnitt 22, ausserhalb des eigentlichen Schusseintragsvorganges, steht der Faden nicht unter Zug im Zeitpunkt 23 wird der Faden beschleunigt und tritt ins Webfach ein Dies fuhrt zu einem raschen Anstieg der Fadenkraft Im Zeitabschnitt 24 lauft der Faden ins Webfach ein Im Zeitpunkt 25 wird der in seiner Lange vom Vorspuigerat 3 vorbestimmte Faden von diesem gestoppt, was zu einer typischen Kraftspitze fuhrt Der Faden bleibt danach wah- rend dem Zeitabschnitt 26 gespannt, bis im Zeitpunkt 27 das Webblatt den Faden ans Gewebe anschlagt und dabei wiederum eine charakteristische Kraftspitze erzeugt Anschliessend wird der Faden beidseits von den Scheren 10 und 12 geschnitten, die Fadenkraft verschwindet, und der Zyklus beginnt erneutThe shape of the signal 13 is shown in its time course in FIG. 2 using the example of an air-jet weaving machine. The diagram shows the thread tension in the vertical axis 20, the time in section 22 in the horizontal axis 21, outside the actual weft insertion process, the thread is not under Train at time 23, the thread is accelerated and enters the shed.This leads to a rapid increase in the thread force. In time segment 24, the thread runs into the shed. At time 25, the length of the thread predetermined by the pre-cleaning unit 3 is stopped by this, resulting in a typical force peak. The thread remains selected afterwards. rend the time period 26 until at 27 the reed strikes the thread on the tissue and again generates a characteristic force peak. The thread is then cut on both sides by the scissors 10 and 12, the thread force disappears and the cycle begins again
Die verschiedenen Möglichkeiten zur Auswertung dieses Signals sind in der Folge beschrieben In Fig 3 ist das Kraftsignal bei störungsfreiem Schusseintrag analog zur Fig 2 dargestellt Die Überwachung eines solchen Signalverlaufes über bestimmte Zeitabschnitte hinweg gehört zum bekannten Stand der Technik der digitalen Signal- verarbeitung Das in analoger Form vom Sensor gelieferte Signal wird dazu in Zeitintervallen von maximal 10 ms, bevorzugt weniger als 1 ms, digitalisiert, und mit den dem betreffenden Zeitschritt zugeordneten Grenzwerten verglichen Diese Grenzwerte können vom Benutzer der Maschine auf Grund von Garndaten oder Erfahrungswerten fest eingegeben werden, oder aber vom Auswertegerat selbst wahrend des praktischen Einsatzes nach dem Prinzip der adaptiven Steuerung selbst festgelegt werden Auch ein sogenanntes Teach-In durch den Bediener ist vorgesehen Schhesslich ist auch vorgesehen, von dem auf Grund der Betriebserfahrung ermittelten Verlauf der Fadenkraft für jeden Zeitschritt den Mittelwert zu bilden und damit einen Musterverlauf festzulegen Nun wird jeder einzelne Schusseintrag mit diesem Musterverlauf verglichen, und bei Überschreiten einer vorgegebenen Toleranz ein Alarm ausgelost oder die Maschine gestoppt Ein entscheidender Vorteil besteht darin, dass der zum Stopp fuhrende Kraftverlauf anschliessend für die Diagnose durch den Bediener zur Verfugung steht und mit dem Bild verglichen werden kann, das ihm die Maschine selbst bietetThe various possibilities for evaluating this signal are described in the following. In FIG. 3, the force signal with interference-free weft insertion is shown analogously to FIG. 2. The monitoring of such a signal course over certain time periods is part of the known state of the art in digital signal processing, in analog form For this purpose, the signal supplied by the sensor is digitized in time intervals of at most 10 ms, preferably less than 1 ms, and compared with the limit values assigned to the relevant time step.These limit values can be entered by the user of the machine on the basis of yarn data or empirical values, or by Evaluation device itself can be determined during practical use according to the principle of adaptive control. A so-called teach-in by the operator is also provided. Schhesslich is also provided, based on the operating experience of the thread force for each n Time step to form the mean and thus define a pattern course.Each individual weft entry is compared with this pattern course, and if a specified tolerance is exceeded, an alarm is triggered or the machine is stopped.A decisive advantage is that the force curve leading to the stop is then used for diagnosis is available by the operator and can be compared with the image that the machine itself offers
Als Grenzwerte kommt, wie in Fig 3 gezeigt, beispielsweise die Maximalzugkraft 30 beim Einziehen des Garnes in Betracht Diese Zugkraft ist infolge der gleichzeitigen Beschleunigung des Games auf einen bestimmten Wert begrenzt, der in der Regel tiefer liegt als jener beim Stoppen des Games Wahrend des ganzen Schusseintrages ist eine minimale Fadenkraft 31 zu überwachen, um Fadenbruche sofort zu erkennen Schliesslich ist die Spitzenbelastung des Garnes beim Stoppen 32 zu überwachen Die Grosse dieser Kraftspitze ist andererseits ein Merkmal für den erfolgreich vollzogenen Schusseintrag, und wird wiederum mit einem Minimaiwert 33 überwacht Auch die zeitlichen Ablaufe, gegeben durch die Lage der Kraftspitzen 23, 25 und 27 sind auf analoge Weise durch die Steuerung zu überwachen Diese Funktion ist hier nicht weiter dargestellt, weil sie gleich gehandhabt wird wie die heute bereits übliche Überwachung des Ankommens des Fadenkopfes im Bereich der Schere 12 (Fig 1 ) mit einem optischen SensorThe limit values, as shown in FIG. 3, are, for example, the maximum tensile force 30 when the yarn is being drawn in. This tensile force is limited to a certain value due to the simultaneous acceleration of the game, which is generally lower than that when the game is stopped throughout A minimal thread force 31 is to be monitored in order to immediately recognize thread breaks. Finally, the peak load of the yarn when stopping 32 is to be monitored. The magnitude of this force peak is, on the other hand, a characteristic of the successfully implemented weft insertion, and is in turn also monitored with a minimum value 33 the timing, given by the position of the force peaks 23, 25 and 27, is to be monitored in an analog manner by the control system.This function is not shown here because it is handled in the same way as the monitoring of the arrival of the line in the area of the Scissors 12 (Fig 1) with an optical sensor
Die Ausgestaltung des Verfahrens zur Optimierung des Schusseintrages zeigt die Fig 4 Die Fadenkraft ist in der vertikalen Achse 20 dargestellt Die horizontale Achse 40 ist hier aber nicht zeitlich, sondern in Abschnitte 41 des Webzyklusses eingeteilt, welche einer bestimmten Anzahl Winkeigrade der Hauptwelle der Webmaschine entsprechen Hieraus lasst sich die Zuordnung bestimmter Effekte beim Schusseintrag zu den Steuerungsfunktionen der Webmaschine erkennen Dies ist für das praktische Vorgehen beim Optimieren des Schusseintrages entscheidend, denn über die dazu notigen Eingriffe muss der Bediener entscheiden, oder sie müssen ihm bei einem automatischen Optimierungsverfahren zumindest bekannt und plausibel sein Der normale Kraftverlauf 42 wird durch Mittelwertbildung einer Reihe von Eintragszyklen numerisch ermittelt und auf dem Bildschirm farbig (hier gepunktet) dargestellt Abweichungen einzelner Zyklen, die zum Stopp der Maschine fuhren, wie beispielsweise die durch Fadenbruch abgebrochenen Schusseintrage 43 oder 44, werden davon abweichend besonders kenntlich gemacht Dabei gibt eine automatische Fehlerdiagnose gleich die Art des Fehlers an, wie dies heute bereits in einfacher Weise mit alphanumerischen Anzeigen auf den Webmaschinen erfolgt, jedoch nur in sehr beschranktem Umfang, z B mit der Unterscheidung von Schuss- oder KettfehlerThe design of the method for optimizing the weft insertion is shown in FIG. 4. The thread force is shown in the vertical axis 20. However, the horizontal axis 40 is not divided here in time, but in sections 41 of the weaving cycle, which correspond to a certain number of degrees of angularity of the main shaft of the weaving machine the assignment of certain effects during weft insertion to the control functions of the weaving machine can be recognized.This is crucial for the practical procedure when optimizing the weft insertion, because the operator has to decide on the necessary interventions, or at least be familiar and plausible with an automatic optimization process The normal force curve 42 is numerically determined by averaging a number of entry cycles and is shown in color on the screen (dotted here). Deviations of individual cycles that lead to the machine stopping, such as those caused by thread breakage broken weft entries 43 or 44, are deviated from it particularly clearly identified.Automatic error diagnosis immediately indicates the type of error, as is already done in a simple manner with alphanumeric displays on the weaving machines, but only to a very limited extent, e.g. with the Differentiate between weft and warp defects
In ahnlicher Weise macht die Anzeige auf ungunstige Einsteilwerte aufmerksam, beispielsweise auf zu hohe Kraftspitzen 45 im Bereich des Fadenstoppens Wahrend in diesem Fall die Maschine nicht angehalten wird, weist die Anzeige deutlich mit dem Pfeil 46 auf die heikle Stelle hin, welche mit einer geänderten Einstellung zu beheben ist, beispielsweise durch Verlangsamung des Schusseintrages über eine Senkung des Druckes an den Stafettendusen In a similar manner, the display draws attention to unfavorable setting values, for example excessive force peaks 45 in the area of the thread stopping. In this case, the machine is not stopped, the arrow 46 clearly indicates the sensitive area, which is indicated by a changed setting is to be remedied, for example, by slowing down the weft insertion by reducing the pressure at the relay nozzles

Claims

Patentansprüche claims
Verfahren zum Messen der Fadenkraft beim Schusseintrag einer Webmaschine, dadurch gekennzeichnet, dass ein Sensor mit einer Greπzfrequenz von mindestens 1 kHz in Verbindung mit einer digitalen Auswertung mit einer Abtastrate von mindestens 100 Hz kontinuierlich von Schuss zu Schuss eingesetzt wirdMethod for measuring the thread force during the weft insertion of a weaving machine, characterized in that a sensor with a limit frequency of at least 1 kHz in connection with a digital evaluation with a sampling rate of at least 100 Hz is used continuously from weft to weft
Verfahren gemass Anspruch 1 , dadurch gekennzeichnet, dass zur Erfassung der Fadenzugkraft ein piezoresisitives Messeiement eingesetzt wirdMethod according to claim 1, characterized in that a piezoresistive measuring element is used to detect the thread tension
Verfahren gemass Anspruch 1 , dadurch gekennzeichnet, dass zur Erfassung der Fadeπzugkraft ein piezoelektrisches Messelement eingesetzt wirdA method according to claim 1, characterized in that a piezoelectric measuring element is used to detect the Fadeπzugkraft
Verfahren gemass einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Messung der Fadenkraft im Fadeπlauf nach der Schussfadenbremse, jedoch vor dem Eintritt ins Webfach erfolgt.Method according to one of the preceding claims, characterized in that the measurement of the thread force in the Fadeπlauf after the weft brake, but before entering the shed takes place.
Verfahren gemass einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Auswertung des Kraftsignals bezogen auf die Winkellage der Hauptwelle der Webmaschine erfolgtMethod according to one of the preceding claims, characterized in that the force signal is evaluated in relation to the angular position of the main shaft of the weaving machine
Verfahren gemass einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass die Fadenkraft über einen bezüglich Zeit oder Hauptwellenwinkel vorbestimmten Abschnitt hinweg auf einen Minimalwert hin überwacht wird, und dass bei Unterschreiten dieser Grenze eine vorbestimmte Funktion der Webmaschine ausgelost wirdMethod according to one of Claims 1-5, characterized in that the thread force is monitored for a minimum value over a section which is predetermined with respect to time or main shaft angle, and that a predetermined function of the weaving machine is triggered when this limit is undershot
Verfahren gemass einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass die Fadenkraft über einen bezüglich Zeit oder Hauptwellenwinkel vorbestimmten Abschnitt hinweg auf einen Maximalwert hin überwacht wird, und dass bei Unterschreiten dieser Grenze eine vorbestimmte Funktion der Webmaschine ausgelostMethod according to one of Claims 1-5, characterized in that the thread force is monitored for a maximum value over a section which is predetermined with respect to time or main shaft angle, and that a predetermined function of the weaving machine is triggered when this limit is undershot
Verfahren gemass einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass der Abstand bestimmter Merkmale des Fadenkraftverlaufes bezuglich Zeit oder Hauptwellenwinkel auf vorbestimmte Toleranzfelder hin überwacht wird, und dass bei Überschreiten dieser Toleranzen eine vorbestimmte Funktion der Webmaschine ausgelost wirdMethod according to one of claims 1-5, characterized in that the distance of certain features of the thread force curve with respect to time or main shaft angle is monitored for predetermined tolerance fields, and that if these tolerances are exceeded, a predetermined function of the weaving machine is triggered
Verfahren gemass einem der Ansprüche 1 - 5, dadurch gekennzeichnet, dass vom Verlauf der Fadenkraft wahrend einer Phase des Schusseintrages ein Muster aufgenommen und daraufhin die Überwachung der Fadenkraft auf das Einhalten dieses Musters hm erfolgt, und dass bei Abweichung von diesem Muster eine vorbestimmte Funktion der Webmaschine ausgelost wird Method according to one of claims 1-5, characterized in that a pattern is recorded of the course of the thread force during a phase of the weft insertion and then the thread force is monitored for compliance with this pattern hm, and that if this pattern deviates, a predetermined function of the Loom is drawn
EP00922537A 1999-03-22 2000-03-22 Method for optimizing and monitoring weft insertion in power looms Expired - Lifetime EP1163384B1 (en)

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CH54199 1999-03-22
CH54199 1999-03-22
PCT/EP2000/002541 WO2000056964A2 (en) 1999-03-22 2000-03-22 Method for optimizing and monitoring weft insertion in power looms

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WO2000056964A2 (en) 2000-09-28
KR100432266B1 (en) 2004-05-22
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KR20010108375A (en) 2001-12-07
DE50003645D1 (en) 2003-10-16
CN1108406C (en) 2003-05-14
EP1163384B1 (en) 2003-09-10
WO2000056964A3 (en) 2000-12-28
CN1347468A (en) 2002-05-01
JP4546649B2 (en) 2010-09-15
ATE249539T1 (en) 2003-09-15

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