EP0708189B1 - Method of controlling yarn tension - Google Patents

Method of controlling yarn tension Download PDF

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Publication number
EP0708189B1
EP0708189B1 EP94810604A EP94810604A EP0708189B1 EP 0708189 B1 EP0708189 B1 EP 0708189B1 EP 94810604 A EP94810604 A EP 94810604A EP 94810604 A EP94810604 A EP 94810604A EP 0708189 B1 EP0708189 B1 EP 0708189B1
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EP
European Patent Office
Prior art keywords
accordance
thread
control curve
thread tension
curve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP94810604A
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German (de)
French (fr)
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EP0708189A1 (en
Inventor
Frank Dr. Lehnert
Godert Dr. De Jager
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Itema Switzerland Ltd
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Sulzer Textil AG
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Publication date
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Priority to DE59409619T priority Critical patent/DE59409619D1/en
Priority to EP94810604A priority patent/EP0708189B1/en
Priority to JP7254173A priority patent/JPH08269845A/en
Priority to US08/537,558 priority patent/US5669421A/en
Publication of EP0708189A1 publication Critical patent/EP0708189A1/en
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Publication of EP0708189B1 publication Critical patent/EP0708189B1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/18—Devices for indicating warp tension
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

  • the invention relates to a method for regulating the Thread tension, especially for weft or warp threads in a weaving machine and weaving machine for carrying out the Procedure.
  • DE-C-43 23 748 a method is disclosed in the one based on the weft yarn-specific data that represent a target value and a control curve for the course of the measured actual value the tensile force calculated. Deviations occur from the Setpoint-actual value comparison on, a new control curve calculated to by changing the brake stroke adjustment the weft braking force to the course of the Adjust thread tension.
  • control curve is only limited when the weaving machine is running can be changed, the change of Thread tension based on experience and the Brake setting based on the previously defined Braking parameters and yarn properties are done manually.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the Task a procedure for regulating the thread tension and a weaving machine to carry out the method create, in which the adaptation to the optimal Thread tension curve based on specifications and in Dependence of the weaving process takes place automatically and that to regulate the thread tension for warp threads and / or Weft threads are suitable.
  • the first step is for each angle of rotation Thread tension measured per weft insertion and for one certain number of weft entries, e.g. 50 a Average of the thread tension for each angle of rotation determined as the actual thread tension data in a Curve a are shown. Below are these Thread tension actual value data with at least one setpoint the thread tension compared. This comparison becomes calculates a first approximate control curve b. Out this first control curve results in a new one Actual value of the thread tension (curve c).
  • the next step is to compare the new Actual value curve with the nominal value of the thread tension one another control curve with one compared to the first Control curve reduced target / actual value deviation calculated. After a selectable number of Weft entries will be the control curve in the scheme brought in.
  • the target / actual value deviation is reduced to a minimum.
  • This rule structure includes one Control device 1, which is part of the weaving machine control is an actuator 2, which is on the loom a controlled system is provided, i.e. the thread course, a device 3 for measuring the thread tension, a Device 4 for entering parameters and a Device 5 for determining the control curve.
  • the regulation and control structure described above form a basic version with which the Thread tension regulated for weft threads and / or warp threads can be and which e.g. Gripper and Projectile looms can be applied.
  • the weft course includes one Braking phase (window 1) while the thread is being braked and a return phase (window 2) during the registered weft thread through the thread tensioner is withdrawn.
  • the thread tension curve is optimized according to the basic version of the Regulation, wherein a setpoint curve for a Weft insertion, i.e. 360 values are given and where additionally the thread break analysis with the criteria Thread breakage due to excessive thread tension and Weft insertion error due to insufficient thread tension be included. When these criteria occur the nominal value of the thread tension is newly determined.
  • the Thread break analysis is advantageously carried out in the braking or Return phase.
  • the thread tension curve of a weft thread is on the one hand by the braking force and the braking time as well as the properties of the yarn changed.
  • the maximum thread tension (curve g) during the braking phase (Window 1) are brought below a setpoint S1.
  • the thread tension curve increases during the Return phase (window 2) on.
  • the regulation reacts to this with an increase in braking force, causing the setpoint S2 exceeded, i.e. is observed. Based on these Measures the second control curve (curve f) calculated so that a new actual value curve (curve g) results.
  • This rule structure includes one Control device 11, which is part of the not shown Machine control is a magnetically operated Thread brake 12, the controlled system, i.e. the Weft thread course when weft insertion, a pressure gauge 13, whose pressure readings are proportional to the thread tension are a device 14 for determining the control curve and a device 15 for specifying the thread tension.
  • Control device 11 which is part of the not shown Machine control is a magnetically operated Thread brake 12, the controlled system, i.e. the Weft thread course when weft insertion, a pressure gauge 13, whose pressure readings are proportional to the thread tension are a device 14 for determining the control curve and a device 15 for specifying the thread tension.
  • fuzzy logic for example for window 1 the categories high, medium, good, which are related to an average thread tension and for window 2 sets the categories high, good, low, which are related to the absolute values of the thread tension.
  • Window 1 Braking force Braking time high high less later high Good - later high deep higher later medium high less - medium Good - later medium deep higher - Good high less earlier Good Good - - Good deep higher earlier
  • the thread tension curve of the warp threads is on the one hand through the warp let-off device, the match tree and the Goods removal device specified and as shown in FIG. 7 on the other hand, by touching the reed (window 1) and affects the opening of the shed (window 2), so that the warp run is subject to an alternating load.
  • the thread tension curve is optimized according to the basic version.
  • the warp thread break analysis includes the thread break due to too high thread tension and severing the Warp threads through the projectile or the Looper due to thread tension too low.
  • the cutting of the warp threads occurs due to the The warp threads tend to cling, i.e. from the warp beam unwound threads stick together. this leads to cause warp threads in the latter when the shed is open hang in and be severed by the entry organ.
  • the parenthesis inclination is determined statistically using the occurring thread breaks within e.g. 100,000 Shot entries determined and by increasing the The target value of the thread tension curve has been eliminated.
  • This rule structure includes one Control device 21, which is part of the not shown Machine control is an actively controllable Match tree 22, the controlled system, i.e. the Warp thread course from the warp beam to the edge of the goods, one Pressure meter 23, the pressure measured values proportional to Thread tension are a device 24 for determining the control curve and a device 25 for specifying or automatic adjustment of the setpoints of the Thread tension.

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

Description

Die Erfindung betrifft ein Verfahren zur Regelung der Fadenzugkraft, insbesondere für Schuss- bzw. Kettfäden in einer Webmaschine und Webmaschine zur Durchführung des Verfahrens.The invention relates to a method for regulating the Thread tension, especially for weft or warp threads in a weaving machine and weaving machine for carrying out the Procedure.

Beim Webvorgang werden die Kettfäden während der Fachbildung und dem Anschlagen sowie der Schussfaden während des Eintrages wechselnden Beanspruchungen ausgesetzt.In the weaving process, the warp threads during the Shedding and weft as well as weft stresses changing during the entry exposed.

In der DE-C-43 23 748 ist ein Verfahren offenbart, bei dem anhand der einen Schussfaden repräsentierenden garnspezifischen Daten, die einen Sollwert darstellen und dem gemessenen Istwert eine Steuerkurve für den Verlauf der Zugkraft berechnet. Treten Abweichungen aus dem Soll-Istwertvergleich auf, wird eine neue Steuerkurve berechnet, um durch eine Änderung der Bremshubverstellung die Schussfadenbremskraft an den Verlauf der Fadenzugkräfte anzupassen.In DE-C-43 23 748 a method is disclosed in the one based on the weft yarn-specific data that represent a target value and a control curve for the course of the measured actual value the tensile force calculated. Deviations occur from the Setpoint-actual value comparison on, a new control curve calculated to by changing the brake stroke adjustment the weft braking force to the course of the Adjust thread tension.

Der Nachteil dieser Vorgehensweise besteht darin, dass die Steuerkurve bei laufender Webmaschine nur begrenzt verändert werden kann, wobei die Aenderung der Fadenzugkraft anhand von Erfahrungswerten und die Bremseinstellung anhand der zuvor festgelegten Bremsparametern und Garneigenschaften manuell erfolgt. The disadvantage of this approach is that the control curve is only limited when the weaving machine is running can be changed, the change of Thread tension based on experience and the Brake setting based on the previously defined Braking parameters and yarn properties are done manually.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe ein Verfahren zur Regelung der Fadenzugkraft und eine Webmaschine zur Durchführung des Verfahrens zu schaffen, bei dem die Anpassung an den optimalen Fadenzugkraftverlauf aufgrund von Vorgaben und in Abhängigkeit des Webvorganges automatisch erfolgt und das zur Regelung der Fadenzugkraft für Kettfäden und/oder Schussfäden geeignet ist.The invention seeks to remedy this. The invention as characterized in the claims, solves the Task a procedure for regulating the thread tension and a weaving machine to carry out the method create, in which the adaptation to the optimal Thread tension curve based on specifications and in Dependence of the weaving process takes place automatically and that to regulate the thread tension for warp threads and / or Weft threads are suitable.

Im folgenden wird die Erfindung anhand der beiliegenden Zeichnungen erläutert.In the following the invention with reference to the enclosed Drawings explained.

Es zeigen:

Fig. 1
ein Diagramm mit einem vorgebenen Fadenzugkraftverlauf und einer nach dem erfindungsgemässen Verfahren erzeugten Steuerkurve,
Fig. 2
eine Regelstruktur zur Erzeugung der Steuerkurve,
Fig. 3 und 4
ein Diagramm des Istwertverlauf der Fadenzugkraft und ein Diagramm der zugehörigen Steuerkurven bei Einbezug der Fadenbruchanalyse,
Fig. 5
eine Regelstruktur zur Erzeugung der Steuerkurve gemäss Fig. 4,
Fig. 6
ein Diagramm welche die Kategorien in den Belastungsbereichen zeigt, wenn eine Fuzzy-Logik verwendet wird,
Fig. 7 und 8
ein Diagramm des Istwertverlaufes der Kettfadenzugkraft und ein Diagramm der zugehörigen Steuerkurve und
Fig. 9
eine Regelstruktur zur Erzeugung der Steuerkurve gemäss Fig. 8.
Show it:
Fig. 1
2 shows a diagram with a specified thread tension curve and a control curve generated by the method according to the invention,
Fig. 2
a control structure for generating the control curve,
3 and 4
a diagram of the actual value curve of the thread tension and a diagram of the associated control curves when the thread break analysis is included,
Fig. 5
4 shows a control structure for generating the control curve according to FIG. 4,
Fig. 6
a diagram showing the categories in the load areas when fuzzy logic is used,
7 and 8
a diagram of the actual value curve of the warp thread tension and a diagram of the associated control curve and
Fig. 9
a control structure for generating the control curve according to FIG. 8.

Es wird auf die Figuren 1 und 2 Bezug genommen.In einem ersten Schritt wird für jeden Drehwinkel die Fadenzugkraft pro Schusseintrag gemessen und für eine bestimmte Anzahl von Schusseinträgen, z.B. 50 ein Mittelwert der Fadenzugkraft für jeden Drehwinkel bestimmt, die als Fadenzugkraft-Istwertdaten in einer Kurve a dargestellt sind. Nachfolgend werden diese Fadenzugkraft-Istwertdaten mit mindestens einem Sollwert der Fadenzugkraft verglichen. Aus diesem Vergleich wird eine erste angenäherte Steuerkurve b berechnet. Aus dieser ersten Steuerkurve ergibt sich ein neuer Istwertverlauf der Fadenzugkraft (Kurve c).Reference is made to FIGS. 1 and 2 The first step is for each angle of rotation Thread tension measured per weft insertion and for one certain number of weft entries, e.g. 50 a Average of the thread tension for each angle of rotation determined as the actual thread tension data in a Curve a are shown. Below are these Thread tension actual value data with at least one setpoint the thread tension compared. This comparison becomes calculates a first approximate control curve b. Out this first control curve results in a new one Actual value of the thread tension (curve c).

In einem weiteren Schritt wird durch Vergleich des neuen Istwertverlaufes mit dem Sollwert der Fadenzukraft eine weitere Steuerkurve mit einer gegenüber der ersten Steuerkurve verringerten Soll/Istwertabweichung berechnet. Nach einer wählbaren Anzahl von Schusseinträgen wird die Steuerkurve in die Regelung eingebracht.The next step is to compare the new Actual value curve with the nominal value of the thread tension one another control curve with one compared to the first Control curve reduced target / actual value deviation calculated. After a selectable number of Weft entries will be the control curve in the scheme brought in.

Durch Weiterführung der Vergleiche kann die Soll/Istwertabweichung auf ein Minimum reduziert werden.By continuing the comparisons, the The target / actual value deviation is reduced to a minimum.

Ferner ist eine systematische Variation der Amplitude und/oder der Phase bezüglich dem Drehwinkel vorgesehen, um die Steuerkurve zu optimieren. Die Optimierung erfolgt, indem die Amplitude der Steuerkurve konstant gehalten und die Phase, d.h. Lage der Steuerkurve bezüglich dem Drehwinkel der Hauptwelle systematisch, z.B. zwischen +/- 10° variiert wird, um die zeitliche Abweichung des Steuersignals festzustellen. Nachfolgend werden die Amplitude und Phase abwechselnd variiert. Die Einstellung mit der geringsten Abweichung wird gespeichertThere is also a systematic variation in amplitude and / or the phase with respect to the angle of rotation is provided, to optimize the control curve. The optimization done by keeping the amplitude of the control curve constant held and the phase, i.e. Position of the control curve systematically with respect to the angle of rotation of the main shaft, e.g. is varied between +/- 10 ° to the temporal Determine deviation of the control signal. Below the amplitude and phase are varied alternately. The Setting with the least deviation saved

Zur Durchführung der vorstehend beschriebenen Regelung wird eine Regelstruktur verwendet, die in Fig. 2 dargestellt ist. Diese Regelstruktur umfasst eine Steuereinrichtung 1, die Teil der Webmaschinensteuerung ist, ein Stellelement 2, das an der Webmaschine vorgesehen ist, eine Regelstrecke, d.h. der Fadenverlauf, eine Einrichtung 3 zur Messung der Fadenzugkraft, eine Einrichtung 4 zur Eingabe von Parametern und eine Vorrichtung 5 zur Ermittlung der Steuerkurve.To implement the regulation described above a control structure is used, which is shown in FIG is shown. This rule structure includes one Control device 1, which is part of the weaving machine control is an actuator 2, which is on the loom a controlled system is provided, i.e. the thread course, a device 3 for measuring the thread tension, a Device 4 for entering parameters and a Device 5 for determining the control curve.

Die vorstehend beschriebene Regelung und Regelstruktur bilden eine Grundausführung, mit welcher die Fadenzugkraft für Schussfäden und/oder Kettfäden geregelt werden können und die bei z.B. Greifer- und Projektilwebmaschinen angewendet werden kann.The regulation and control structure described above form a basic version with which the Thread tension regulated for weft threads and / or warp threads can be and which e.g. Gripper and Projectile looms can be applied.

Während der Herstellung eines Gewebes ist der Fadenzugkraftverlauf verschiedenen Aenderungen unterworfen. Folgende Aenderungen werden erfindungsgemäss in die Regelung einbezogen:

  • 1. Die Position des jeweiligen Stellelementes, die durch eine Messeinrichtung fortlaufend ermittelt wird.
  • 2. Die Werte der Fadenbruchanalyse, mit welcher die Häufigkeit und der Zeitpunkt des Fadenbruches anhand der Fadenzugkraftänderung in Abhängigkeit des Drehwinkels der Hauptwelle erfasst wird, bzw. die Anzahl der Fadenbrüche in Abhängigkeit der Zeit statistisch ermittelt werden.
  • 3. Die Anzahl von Maschinenstopps aufgrund von Störungen im Fadenlauf.
  • 4. Die Anschlagkraft des Webblattes und/oder die Fachgeometrie, die aus der entstehenden Längenänderung der Kette anhand der Positionsänderung des Stellelementes mit Vorteil des Streichbaumes bestimmt werden.
  • 5. Die Durchlaufzeit des eingetragenen Schussfadens.
  • 6. Die Klammerneigung der Kettfaden, etc.
    • The course of the thread tension is subject to various changes during the manufacture of a fabric. The following changes are included in the control according to the invention:
  • 1. The position of the respective control element, which is continuously determined by a measuring device.
  • 2. The values of the thread break analysis, with which the frequency and the time of the thread break is recorded on the basis of the change in thread tension depending on the angle of rotation of the main shaft, or the number of thread breaks depending on the time is determined statistically.
  • 3. The number of machine stops due to thread run problems.
  • 4. The impact force of the reed and / or the geometry of the shed, which are determined from the resulting change in length of the chain based on the change in position of the adjusting element with advantage of the match tree.
  • 5. The throughput time of the inserted weft thread.
  • 6. The inclination of the warp threads, etc.

    • Ausgehend von der vorstehend beschriebenen Grundausführung der Regelung wird nachfolgend die Regelung des Fadenzugkraftverlaufes eines Schussfadens bei einer Projektilwebmaschine beschrieben.Starting from the one described above The basic version of the regulation is as follows Regulation of the thread tension curve of a weft thread described in a projectile loom.

    Der für einen Schusseintrag charakteristische Fadenzugverlauf (Kurve d) ist in Fig. 3 und die entsprechende erste Steuerkurve (Kurve e) ist in Fig. 4 dargestellt.The characteristic of a weft entry Thread course (curve d) is in Fig. 3 and the the corresponding first control curve (curve e) is shown in FIG. 4 shown.

    Wie die Fig. 3 zeigt, umfasst der Schussfadenverlauf eine Bremsphase (Fenster 1) während der Faden abgebremst wird und eine Rückholphase (Fenster 2) während der eingetragene Schussfaden durch den Fadenspanner zurückgezogen wird.As shown in FIG. 3, the weft course includes one Braking phase (window 1) while the thread is being braked and a return phase (window 2) during the registered weft thread through the thread tensioner is withdrawn.

    Die Optimierung des Fadenzugkraftverlaufes erfolgt gemäss der vorstehend beschriebenen Grundausführung der Regelung, wobei ein Sollwertverlauf für einen Schusseintrag, d.h. 360 Werte vorgegeben werden und wobei zusätzlich die Fadenbruchanalyse mit den Kriterien Fadenbruch aufgrund zu hoher Fadenzugkraft und Schusseintragfehler aufgrund zu geringer Fadenzugkraft einbezogen werden. Beim Auftreten dieser Kriterien wird der Sollwert der Fadenzugkraft neu bestimmt. Die Fadenbruchanalyse erfolgt mit Vorteil in der Brems- bzw. Rückholphase.The thread tension curve is optimized according to the basic version of the Regulation, wherein a setpoint curve for a Weft insertion, i.e. 360 values are given and where additionally the thread break analysis with the criteria Thread breakage due to excessive thread tension and Weft insertion error due to insufficient thread tension be included. When these criteria occur the nominal value of the thread tension is newly determined. The Thread break analysis is advantageously carried out in the braking or Return phase.

    Der Fadenzugkraftverlauf eines Schussfaden wird einerseits durch die Bremskraft und den Bremszeitpunkt sowie andererseits durch die Eigenschaften des Garnes verändert. Durch einen späteren Bremszeitpunkt kann die maximale Fadenzugkraft (Kurve g) während der Bremsphase (Fenster 1) unter einen Sollwert S1 gebracht werden. In der Folge steigt der Fadenzugkraftverlauf während der Rückholphase (Fenster 2) an. Die Regelung reagiert darauf mit einer Anhebung der Bremskraft, wodurch der Sollwert S2 überschritten,d.h. eingehalten wird. Aufgrund dieser Massnahmen wird die zweite Steuerkurve (Kurve f) berechnet, so dass sich ein neuer Istwertverlauf (Kurve g) ergibt. Tritt im weiteren ein Fadenbruch aufgrund zu geringer Kraft auf, wird der Sollwert S2 erhöht und im Falle eines Fadenbruchs aufgrund zu hoher Kraft wird der Sollwert S1 herabgesetzt. Dadurch wird das Risiko von Fadenbrüchen in die Regelung einbezogen und die bestmögliche Einstellung der Bremskraft erreicht.The thread tension curve of a weft thread is on the one hand by the braking force and the braking time as well as the properties of the yarn changed. By a later braking time, the maximum thread tension (curve g) during the braking phase (Window 1) are brought below a setpoint S1. In As a result, the thread tension curve increases during the Return phase (window 2) on. The regulation reacts to this with an increase in braking force, causing the setpoint S2 exceeded, i.e. is observed. Based on these Measures the second control curve (curve f) calculated so that a new actual value curve (curve g) results. If a thread break occurs due to low force, the setpoint S2 is increased and in In the event of a thread break due to excessive force, the Setpoint S1 reduced. This will reduce the risk of Thread breaks included in the regulation and the best possible setting of the braking force reached.

    Die Fig. 5 zeigt eine Regelstruktur zur Durchführung der Regelung. Diese Regelstruktur umfasst eine Steuereinrichtung 11, die Teil der nicht dargestellten Maschinensteuerung ist, eine magnetisch betätigbare Fadenbremse 12, die Regelstrecke, d.h. den Schussfadenverlauf beim Schusseintrag, einen Druckmesser 13, dessen Druckmesswerte proportional zur Fadenzugkraft sind, eine Einrichtung 14 zur Ermittlung der Steuerkurve und eine Einrichtung 15 zur Vorgabe der Fadenzugkraft. 5 shows a control structure for carrying out the Regulation. This rule structure includes one Control device 11, which is part of the not shown Machine control is a magnetically operated Thread brake 12, the controlled system, i.e. the Weft thread course when weft insertion, a pressure gauge 13, whose pressure readings are proportional to the thread tension are a device 14 for determining the control curve and a device 15 for specifying the thread tension.

    Für die Regelung kann eine konventionelle Logik oder Fuzzy-Logik vorgesehen werden.Conventional logic or Fuzzy logic can be provided.

    Wie Fig. 6 zeigt, werden beispielsweise bei der Fuzzy-Logik für das Fenster 1 die Kategorien hoch, mittel, gut, die auf eine mittlere Fadenzugkraft bezogen sind und für das Fenster 2 die Kategorien hoch, gut, tief festgelegt, die auf die Absolutwerte der Fadenzugkraft bezogen sind.As shown in FIG. 6, fuzzy logic, for example for window 1 the categories high, medium, good, which are related to an average thread tension and for window 2 sets the categories high, good, low, which are related to the absolute values of the thread tension.

    Für die Einstellvorgänge werden folgende Regeln angegeben: Fenster 1 Fenster 2 Bremskraft Bremszeitpunkt hoch hoch geringer später hoch gut - später hoch tief höher später mittel hoch geringer - mittel gut - später mittel tief höher - gut hoch geringer früher gut gut - - gut tief höher früher The following rules are given for the setting processes: Window 1 Window 2 Braking force Braking time high high less later high Good - later high deep higher later medium high less - medium Good - later medium deep higher - Good high less earlier Good Good - - Good deep higher earlier

    Ausgehend von der eingangs beschriebenen Grundausführung der Regelung wird im folgenden die Regelung des Fadenverlaufes von Kettfäden bei einer Projektilwebmaschine beschrieben.Starting from the basic version described at the beginning the regulation is the regulation of the Thread course of warp threads in one Projectile weaving machine described.

    Analog zur Fig. 3 betreffend den Schussfadenzugkraftverlauf zeigt die Fig. 7 einen typischen Kettfadenzugkraftverlauf und Fig. 8 (analog zu Fig. 4) die entsprechende erste Steuerkurve.Analogous to FIG. 3 regarding the 7 shows a weft tension force curve typical warp thread tension curve and Fig. 8 (analog to Fig. 4) the corresponding first control curve.

    Der Fadenzugkraftverlauf der Kettfäden wird einerseits durch die Kettablasseinrichtung, den Streichbaum und die Warenabzugeinrichtung vorgegeben und wie Fig. 7 zeigt andererseits durch den Anschlag des Webblattes (Fenster 1) und die Öffnung des Webfaches (Fenster 2) beeinflusst, so dass der Kettlauf einer Wechselbelastung unterliegt.The thread tension curve of the warp threads is on the one hand through the warp let-off device, the match tree and the Goods removal device specified and as shown in FIG. 7 on the other hand, by touching the reed (window 1) and affects the opening of the shed (window 2), so that the warp run is subject to an alternating load.

    Bei der eingangs beschriebenen Grundausführung wird der Mittelwert der Fadenzugkraft über die ganze Breite der Kette oder mindestens einem Teil der Kette als Istwertverlauf und ein Fadenzugkraftverlauf über zwei Schusseinträge, d.h. 720 Werte als Sollwertverlauf angewendet.In the basic version described at the beginning, the Average value of the thread tension over the entire width of the Chain or at least part of the chain as Actual value curve and a thread tension curve over two Weft entries, i.e. 720 values as setpoint curve applied.

    Die Optimierung des Fadenzugkraftverlaufes erfolgt gemäss der Grundausführung.The thread tension curve is optimized according to the basic version.

    Bei dieser Optimierung wird erfindungsgemäss der Bewegungsablauf der Kette beeinflusst, indem insbesondere auf die Vorgänge Blattanschlag (Fenster 1) und Fachöffnung (Fenster 2) Bezug genommen wird. Hierzu wird ein Federmodell des Kett/Gewebelaufes zugrunde gelegt. Das Gewebe und die Kettfäden weisen eine gewisse Elastizität auf, deren Federkonstante sich nach der Formel k = ΔF x L/ΔL berechnet und deren Wert durch Zugversuch bestimmt werden kann. Hierin ist

    ΔF =
    Fadenzugkraftänderung
    L =
    Kettlänge vom Geweberand bis zur Ablöselinie auf dem Kettbaum
    ΔL =
    Kettfadenlängenänderung
    Die Kettfadenlängenänderung ergibt sich aus ΔL = ΔF x L/k. Werden L und k als konstant angenommen so folgt daraus, dass sich ΔL zu ΔF proportional verhält.
    Durch ständige Amplituden- und Phasenoptimierung wird ΔF gegen Null gebracht. Weil dies auf die Zugkraftänderung bei dem Blattanschlag und der Fachöffnung durchgeführt wird, ergibt sich in vorteilhafter Weise ein optimaler Bewegungsablauf des Stellelementes und folglich eine minimale Wechselbelastung für die Kette.With this optimization, the movement sequence of the chain is influenced according to the invention, in particular by referring to the processes of leaf stop (window 1) and compartment opening (window 2). For this purpose, a spring model of the warp / fabric run is used. The fabric and the warp threads have a certain elasticity, the spring constant of which is based on the formula k = ΔF x L / ΔL calculated and its value can be determined by tensile test. Here is
    ΔF =
    Thread tension change
    L =
    Warp length from the fabric edge to the release line on the warp beam
    ΔL =
    Warp length change
    The change in warp thread length results from ΔL = ΔF x L / k. If L and k are assumed to be constant, it follows that ΔL is proportional to ΔF.
    ΔF is brought to zero by constant amplitude and phase optimization. Because this is carried out on the change in tensile force at the blade stop and the compartment opening, there is advantageously an optimal movement sequence of the adjusting element and consequently a minimal alternating load for the chain.

    Zur Optimierung des Fadenzugkraftverlaufes wird zusätzlich die Kettfadenbruchanalyse einbezogen.To optimize the thread tension curve additionally the warp thread break analysis included.

    Die Kettfadenbruchanalyse umfasst den Fadenbruch aufgrund zu hoher Fadenzugkraft und der Durchtrennung der Kettfäden durch das eingeschossene Projekil bzw. der Greifer aufgrund zu tiefer Fadenzugkraft.The warp thread break analysis includes the thread break due to too high thread tension and severing the Warp threads through the projectile or the Looper due to thread tension too low.

    Ist die Fadenzugkraft zu hoch wird nach dem Auftreten einer Anzahl (z.B. 10) von hierfür typischen Fadenbrüchen der Sollwert der Fadenzugkraft herabgesetzt und die Steuerkurve neu bestimmt.If the thread tension is too high after the occurrence a number (e.g. 10) of typical thread breaks the nominal value of the thread tension is reduced and the Control curve redetermined.

    Die Durchtrennung der Kettfäden tritt aufgrund der Klammerneigung der Kettfäden auf, d.h. vom Kettbaum abgewickelte Fäden bleiben aneinander hängen. Dies führt dazu, dass Kettfäden bei geöffneten Webfach in letzteres hineinhängen und vom Eintragorgan durchtrennt werden.The cutting of the warp threads occurs due to the The warp threads tend to cling, i.e. from the warp beam unwound threads stick together. this leads to cause warp threads in the latter when the shed is open hang in and be severed by the entry organ.

    Die Klammerneigung wird auf statistischem Wege anhand der aufgetretenden Fadenbrüche innerhalb z.B. 100'000 Schusseintragungen ermittelt und durch Erhöhung des Sollwertes des Fadenzugkraftverlaufes behoben. The parenthesis inclination is determined statistically using the occurring thread breaks within e.g. 100,000 Shot entries determined and by increasing the The target value of the thread tension curve has been eliminated.

    Die Fig. 9 zeigt eine Regelstruktur zur Durchführung der Regelung. Diese Regelstruktur umfasst eine Steuereinrichtung 21, die Teil der nicht dargestellten Maschinensteuerung ist, einen aktiv ansteuerbaren Streichbaum 22, die Regelstrecke, d.h. den Kettfadenverlauf vom Kettbaum bis zum Warenrand, einen Druckmesser 23, dessen Druckmesswerte proportional zur Fadenzugkraft sind, eine Einrichtung 24 zur Ermittlung der Steuerkurve und eine Einrichtung 25 zur Vorgabe bzw. automatischen Einstellung der Sollwerte der Fadenzugkraft.9 shows a control structure for carrying out the Regulation. This rule structure includes one Control device 21, which is part of the not shown Machine control is an actively controllable Match tree 22, the controlled system, i.e. the Warp thread course from the warp beam to the edge of the goods, one Pressure meter 23, the pressure measured values proportional to Thread tension are a device 24 for determining the control curve and a device 25 for specifying or automatic adjustment of the setpoints of the Thread tension.

    Für die Regelung kann eine konventionelle Logik oder Fuzzy-Logik vorgesehen werden.Conventional logic or Fuzzy logic can be provided.

    Claims (16)

    1. Method for the regulation of thread tension, in particular for weft or warp threads in a loom, wherein, with reference to actual data on thread tension measured per weft insertion and through comparison with at least one desired value of thread tension, a control curve is computed and, through at least one further desired value/actual value comparison, a further control curve having a lower desired value/actual value deviation, characterised in that the amplitude of the control curve and/or the phase of control curve is systematically varied with respect to the angle of rotation of the main shaft; in that the deviations between the actual and desired values of the thread tension are measured and in that that control curve for the control of the setting element is stored which is produced by systematic variation and has the lowest deviation between the actual and desired value, in order to compensate for deviations between actual and desired values of the thread tension and to restrict the maximum thread tension.
    2. Method in accordance with claim 1, characterised in that the actual values are measured in freely selectable time intervals.
    3. Method in accordance with one of the claims 1 or 3, characterised in that the amplitude and the phase are alternately varied.
    4. Method in accordance with one of the claims 1 or 2, characterised in that the amplitude is kept constant and the phase between two selective values is varied.
    5. Method in accordance with one of the claims 1 or 2, characterised in that that phase is kept constant and the amplitude is varied between two selective values.
    6. Method in accordance with one of the claims 1 to 5, characterised in that the control curve is calculated in dependence on the angle of rotation of the main shaft and taking account of at least one parameter of change and/or signal of change occurring in the course of the thread.
    7. Method in accordance with one of the claims 1 to 6, characterised by a parameter of change selected from the group, position of the setting elements, thread breakage analysis, the clip inclination of the warp threads, beat-up force of the reed, shed geometry, transit time of the weft thread or the like and also combinations of the same.
    8. Method in accordance with one of the claims 1 to 6, characterised in that the control curve is preset for at least one weft insertion.
    9. Method in accordance with one of the claims 1 to 6, characterised in that the control curve is preset for the duration of one repeat.
    10. Method in accordance with one of the claims 1 to 6, characterised in that the control curve is continuously preset.
    11. Method in accordance with one of the claims 1 to 6, characterised in that the parameters of change are stored on a storage medium together with the control curve data.
    12. Method in accordance with one of the claims 1 to 11, characterised in that the parameters of change are periodically compensated, and in particular weftwise.
    13. Method in accordance with one of the preceding claims, characterised in that the control curve, which has the smallest deviation between actual value and desired value is used as a constant control curve for the regulation of thread tension.
    14. Method in accordance with one of the claims 1 to 12, characterised in that the desired value of the thread tension is increased or reduced and the control curve is newly determined for the control of the setting element.
    15. Method in accordance with one of the preceding claims, characterised in that the course of the thread tension of the warp thread is preset by the warp tension compensation device, by the whip roll and by the cloth take-off device.
    16. Method in accordance with one of the claims 1 to 14, characterised in that the course of the thread tension of a weft thread is changed by the braking force and the braking time point.
    EP94810604A 1994-10-17 1994-10-17 Method of controlling yarn tension Expired - Lifetime EP0708189B1 (en)

    Priority Applications (4)

    Application Number Priority Date Filing Date Title
    DE59409619T DE59409619D1 (en) 1994-10-17 1994-10-17 Procedure for regulating the thread tension
    EP94810604A EP0708189B1 (en) 1994-10-17 1994-10-17 Method of controlling yarn tension
    JP7254173A JPH08269845A (en) 1994-10-17 1995-09-29 Method for adjusting yarn tension and loom for executing said method
    US08/537,558 US5669421A (en) 1994-10-17 1995-10-02 Method of controlling the yarn tension in a weaving machine

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP94810604A EP0708189B1 (en) 1994-10-17 1994-10-17 Method of controlling yarn tension

    Publications (2)

    Publication Number Publication Date
    EP0708189A1 EP0708189A1 (en) 1996-04-24
    EP0708189B1 true EP0708189B1 (en) 2000-12-27

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    Application Number Title Priority Date Filing Date
    EP94810604A Expired - Lifetime EP0708189B1 (en) 1994-10-17 1994-10-17 Method of controlling yarn tension

    Country Status (4)

    Country Link
    US (1) US5669421A (en)
    EP (1) EP0708189B1 (en)
    JP (1) JPH08269845A (en)
    DE (1) DE59409619D1 (en)

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    ITTO20010737A1 (en) * 2001-07-25 2003-01-25 Lgl Electronics Spa PERFECTED METHOD AND SYSTEM FOR CHECKING BRAKES AND ELECTRIC-CONTROLLED DEVICES FOR AUTOMATIC ADJUSTMENT OF MECHANICAL VOLTAGE
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    DE102010026609B3 (en) * 2010-07-09 2011-11-17 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Method and apparatus for weaving patterns on fabrics with added weft effects
    DE102010034969B3 (en) 2010-08-20 2011-11-03 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Weaving and weaving machine for weaving patterns in fabrics with additional pattern effects
    CN108897293B (en) * 2018-07-19 2020-05-22 广东溢达纺织有限公司 Loom control method, loom control system, computer device, and storage medium
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    Also Published As

    Publication number Publication date
    EP0708189A1 (en) 1996-04-24
    DE59409619D1 (en) 2001-02-01
    US5669421A (en) 1997-09-23
    JPH08269845A (en) 1996-10-15

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