EP0439183A1 - Method for measuring the traction force of a yarn - Google Patents

Method for measuring the traction force of a yarn Download PDF

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Publication number
EP0439183A1
EP0439183A1 EP91100967A EP91100967A EP0439183A1 EP 0439183 A1 EP0439183 A1 EP 0439183A1 EP 91100967 A EP91100967 A EP 91100967A EP 91100967 A EP91100967 A EP 91100967A EP 0439183 A1 EP0439183 A1 EP 0439183A1
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Prior art keywords
signal
thread
value
friction
thread tension
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German (de)
French (fr)
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EP0439183B1 (en
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Hellmut Lorenz
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Oerlikon Barmag AG
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Barmag AG
Barmag Barmer Maschinenfabrik AG
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    • DTEXTILES; PAPER
    • D02YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02GCRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0206Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
    • D02G1/0266Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting false-twisting machines

Definitions

  • the invention relates to a method for monitoring the thread tension according to the preamble of claim 1. This method is known from EP 207 471 A1.
  • the object of the invention is to control the twist on the one hand, but on the other hand, by thread tension measurement to still be able to carry out quality monitoring by measuring the tensile force.
  • twist transmission of the false twister is understood to mean the magnitude of the frictional force of the false twister on the thread and / or the division of the frictional force into the twist-giving component and the promoting component.
  • the invention succeeds in combining the quality-increasing measure of a regulated thread tension with a time-constant mean value and the quality-relevant detection of changes in friction force.
  • a friction false twister which consists of three axes arranged on the corners of an isosceles triangle with spanned disks that overlap in the center of the triangle, is characterized in particular for the implementation of the method by the characterizing features of claim 3, second alternative.
  • the axes can be adjusted in particular by mounting two axes on eccentrics, which can be adjusted by a drive device.
  • the figure shows a schematic representation of a processing point of a false twist crimping machine.
  • the synthetic thread 1 is drawn off from the supply spool 2 by the input delivery unit 3.
  • the texturing zone is formed between the input delivery unit 3 and the take-off delivery unit 9. It mainly comprises a heating rail 4, a cooling rail 5 and the friction false twister 6.
  • the friction false twister has endlessly moving surfaces which are moved transversely to the thread axis and against which the thread lies. These surfaces give the thread a twist in the direction of the input delivery unit, which dissolves again in the direction of the output delivery unit 9.
  • a thread tension measuring instrument 8 is arranged, by means of which the thread tension, also called “thread tension”, is measured and passed on as an output signal. It should be noted that after the starting delivery unit 9 there is a winding or an intermediate treatment by heating.
  • the long-term value LW is fed to a control device 12 together with a target value.
  • the target value and the long-term value are compared with one another and converted into an adjustment variable VS.
  • the adjusting variable VS adjusts an actuator 7, by means of which the twist transmission of the friction false twister 6 onto the thread is controlled.
  • the output signal Z of the tensile force meter 8 as well as the adjustment signal VS of an evaluation device 10 are given.
  • the adjustment signal VS represents the mean value.
  • the monitoring of the adjustment signal within certain limits thus replaces the monitoring of the mean value according to this invention.
  • the evaluation device 10 delivers an evaluation of the current output signal Z, which represents the currently measured thread tension according to the principles described in EP 207 471 A1. This means that an upper limit value and a lower limit value for the adjustment signal VS are stored in the evaluation device 10 (GOVS, GUVS). If the adjustment signal VS exceeds one of these limit values, an alarm signal is issued.
  • the difference value DU between the current output signal Z and the adjustment signal VS - after both have previously been converted into compatible, comparable quantities - is formed in the evaluation device 10.
  • the upper limit value and the lower limit value of this difference signal DU are stored in the evaluation device 10, and an alarm signal A occurs when the difference signal DU between the adjustment signal and the currently measured output signal Z exceeds one of the limit values GODU, GUDU .
  • the adjusting device 7 can be the drive motor of the friction false twister, for example.
  • the device 12 converts the difference signal from the long-term value and the desired value into a variable, for example into a frequency, which determines the rotational speed of the drive motor 7 of the friction false twister designed as a synchronous motor or as an asynchronous motor.
  • the adjusting device 7 can alternatively or additionally adjust the center distance, e.g. the axes are each supported on an eccentric and the eccentrics are rotated accordingly depending on the adjustment signal VS (cf. DE-AS 21 30 550).
  • the adjustment signal (VS) is to be output as electrical current by the control device 12.
  • this electric current is fed to the electromagnet and determines the frictional force that is exerted on the thread.
  • This current is also responsible for the fact that the thread tension can fluctuate only briefly and - measured over a longer period - is adjusted to the setpoint specified by the control device (R).
  • this electrical current is used to determine other errors, such as those mentioned above.
  • the electrical current and the current measured value - after conversion into comparable signal quality - are compared with one another and it is determined whether the current measured value leaves a predefined tolerance band for the electrical current and / or it is determined when the electrical current leaves a predefined second tolerance band .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

To monitor the traction force of a yarn, an average value is continuously formed. A check is made to ensure that the continuous measured value does not exceed the upper limit and a lower limit which varies with the average value, and that the average value does not go beyond specific limits. At the same time, a regulation of the yarn tension is carried out by entering the yarn tension in the false-twist transmitter (6) via a time filter (11), in such a way that a control of the frictional force takes place. The regulating signal forms said average-value signal. …<IMAGE>…

Description

Die Erfindung bezieht sich auf ein Verfahren zur Überwachung der Fadenzugkraft nach dem Oberbegriff des Anspruchs 1. Dieses Verfahren ist durch die EP 207 471 A1 bekannt.The invention relates to a method for monitoring the thread tension according to the preamble of claim 1. This method is known from EP 207 471 A1.

Dieses Verfahren gewährleistet, daß beim Falschzwirntexturieren die Qualitätsausbeute wesentlich verbessert wird.This process ensures that the quality yield is significantly improved in false twist texturing.

Durch die DE 33 06 594 A1 ist ein Verfahren zum Falschzwirntexturieren bekannt, bei dem das von dem Friktionsfalschdrallgeber auf den Faden übertragene Drallmoment in Abhängigkeit von der Zugkraft verstellt wird, und zwar indem die Anpreßkraft zweier auf den Faden einwirkenden Oberflächen entsprechend verstellt wird. Mit diesem Verfahren kann die Fadenzugkraft auf einen konstanten Wert eingeregelt werden. Der Nachteil dieses Verfahrens bei gleichzeitiger Anwendung des eingangs geschilderten bekannten Verfahrens ist jedoch, daß Schwankungen des Mittelwertes nicht mehr in Erscheinung treten und daher u.U. Fehler, die durch die Fadenzugkraftmessung erfaßt werden sollten, nicht mehr erfaßt werden können. Wenn also z.B. durch Verschleiß eines Lieferwerkes oder Fehler in der Temperaturführung der Texturierzone Fadenzugkraftänderungen auftreten, so dient das Meßverfahren nach der EP 207 471 A1 dem Zweck, diese Fehler aufzudecken. Durch Anwendung des Verfahrens nach der DE 33 06 594 A1 wird die Fadenzugkraft jedoch unter Außerachtlassung dieser Fehler ausgeregelt und dadurch werden diese Fehler überdeckt.
Aufgabe der Erfindung ist es, durch Fadenzugkraftmessung einerseits die Drallgebung zu steuern, andererseits aber trotzdem die Möglichkeit zu erhalten, durch Zugkraftmessung auch eine Qualitätsüberwachung durchzuführen.
From DE 33 06 594 A1, a method for false twist texturing is known, in which the twist moment transmitted by the friction false twist transmitter to the thread is adjusted as a function of the tensile force, specifically by adjusting the contact pressure of two surfaces acting on the thread. With this method the thread tension can be adjusted to a constant value. The disadvantage of this method with simultaneous use of the known method described at the outset, however, is that fluctuations in the mean value no longer appear, and therefore errors that should be detected by the thread tension measurement can no longer be detected. If, for example, changes in the tensile force occur due to wear of a delivery unit or errors in the temperature control of the texturing zone, the measuring method according to EP 207 471 A1 serves the purpose of detecting these errors. By using the method according to DE 33 06 594 A1, however, the thread tension is corrected without taking these errors into account and these errors are thereby covered.
The object of the invention is to control the twist on the one hand, but on the other hand, by thread tension measurement to still be able to carry out quality monitoring by measuring the tensile force.

Die Lösung ergibt sich aus dem Kennzeichen des Anspruchs 1.The solution results from the characterizing part of claim 1.

Unter Drallübertragung des Falschdrallgebers wird in dieser Anmeldung die Größe der Reibkraft des Falschdrallers am Faden und/oder die Aufteilung der Reibkraft in die Drallgebende Komponente und fördernde Komponente verstanden.In this application, twist transmission of the false twister is understood to mean the magnitude of the frictional force of the false twister on the thread and / or the division of the frictional force into the twist-giving component and the promoting component.

Das Funktionsprinzip des Friktionsfalschdrallers besteht darin, daß eine oder mehrere bewegte Oberflächen eine Reibkraft auf den Faden ausüben, die eine drallerteilende und eine fadenzugkrafterzeugende Komponente aufweist. Die drallerteilende Komponente erzeugt ein Drehmoment am Faden, wodurch dieser - in Laufrichtung des Fadens gesehen - stromaufwärts gezwirnt wird. Wenn sich die Größe der Reibkraft z.B. durch Änderung des Reibbeiwertes ändert, so ändert sich sowohl die drallerteilende Komponente wie auch die fadenzugkrafterzeugende Komponente, d.h. die Änderung der Fadenzugkraft hat einen indirekten Aussagewert für die Intensität des Texturierprozesses.The principle of operation of the friction false twister is that one or more moving surfaces exert a frictional force on the thread, which has a twist-distributing and a thread tension-generating component. The twist-distributing component generates a torque on the thread, as a result of which it is twisted upstream, as seen in the running direction of the thread. If the magnitude of the friction force e.g. changes by changing the coefficient of friction, so changes both the twist-distributing component and the thread tension-generating component, i.e. the change in thread tension has an indirect value for the intensity of the texturing process.

Erfahrungsgemäß stehen einige Texturierfehler wie Kapillarbrüche, Stellen mit nicht aufgelöstem Drall (tight spots) und die Dichte der Aufwickelpakete in direktem Zusammenhang mit der Fadenzugkraft nach dem Drallgeber. Insofern wirkt es qualitätsverbessernd, wenn die Fadenzugkraft innerhalb enger vorgegebener Grenzen gehalten wird.Experience has shown that some texturing errors such as capillary breaks, places with undissolved twist (tight spots) and the density of the winding packages are directly related to the thread tension after the twister. In this respect, it improves quality if the thread tension is kept within narrow, predetermined limits.

Mit der Erfindung gelingt es, die qualitätssteigernde Maßnahme einer geregelten Fadenspannung mit zeitlich konstantem Mittelwert und die qualitätsrelevante Erfassung von Reibkraftänderungen miteinander zu verbinden.The invention succeeds in combining the quality-increasing measure of a regulated thread tension with a time-constant mean value and the quality-relevant detection of changes in friction force.

Zur Beeinflussung der Drallübertragung steht - wie durch Anspruch 2 vorgeschlagen - insbesondere das Mittel zur Verfügung, die Drehgeschwindigkeit des Friktionsfalschdrallers zu beeinflussen. Bei entsprechender Auslegung der Geometrie im Drallgeber wird durch diese Änderung (innerhalb gewisser Grenzen) die Drallerteilung am Faden nicht wesentlich beeinflußt. Es bleibt der qualitätsfördernde Effekt der weitgehend konstanten Fadenzugkraft. Eine Beeinflussung der Fadenzugkraft hinter dem Drallgeber ist auch über eine geometrische Verstellung am Drallgeber möglich z.B. durch gezielte Veränderung des Achsabstandes.In order to influence the swirl transmission - as proposed by claim 2 - there is in particular the means available to influence the rotational speed of the friction false twister. With an appropriate design of the geometry in the twister, this change (within certain limits) does not significantly affect the twist distribution on the thread. The quality-enhancing effect of the largely constant thread tension remains. It is also possible to influence the thread tension behind the swirl device via a geometric adjustment on the swirl device, e.g. by deliberately changing the center distance.

Bei einem Friktionsfalschdraller, der aus zwei Oberflächen besteht, die den Faden zwischen sich einklemmen - vergleiche z.B. EP 22 743 (Bag. 1187), US-PS 4,145,871 - wird vorzugsweise der Andruck verstellt, wie es auch durch die DE-A1 33 06 594 vorgeschlagen wird.For a friction false twister that consists of two surfaces that pinch the thread between them - compare e.g. EP 22 743 (Bag. 1187), US Pat. No. 4,145,871 - the pressure is preferably adjusted, as is also proposed by DE-A1 33 06 594.

Ein Friktionsfalschdraller, der aus drei auf den Ecken eines gleichschenkligen Dreiecks angeordneten Achsen mit darauf aufgespannten, sich im Zentrum des Dreiecks überlappenden Scheiben besteht, zeichnet sich zur Ausführung des Verfahrens insbesondere durch die kennzeichnenden Merkmale des Anspruchs 3, zweite Alternative, aus. Die Verstellung der Achsen kann insbesondere dadurch geschehen, daß zwei Achsen auf Exzentern gelagert werden, welche durch eine Antriebseinrichtung verstellt werden können.A friction false twister, which consists of three axes arranged on the corners of an isosceles triangle with spanned disks that overlap in the center of the triangle, is characterized in particular for the implementation of the method by the characterizing features of claim 3, second alternative. The axes can be adjusted in particular by mounting two axes on eccentrics, which can be adjusted by a drive device.

Durch die DE-A1 33 06 594 ist es auch bekannt, das Fadenzugkraftsignal zur Ermittlung der Betriebsfähigkeit der Texturierstelle zu verwenden, indem das Meßsignal der Fadenzugkraft auf einen Grenzwertsignalgeber gegeben wird, der bei Überschreiten gewisser Maximalwerte und/oder Minimalwerte der Fadenzugkraft ein Ausgangssignal gibt. Dabei wird jedoch die Aussagekraft des Meßverfahrens nach der EP 207 471 A1, bei der der laufende Meßwert auf den Mittelwert bezogen wird, nicht erreicht.From DE-A1 33 06 594 it is also known to use the thread tension signal to determine the operability of the texturing point by passing the measurement signal of the thread tension to a limit signal transmitter which gives an output signal when certain maximum values and / or minimum values of the thread tension are exceeded. However, the informative value of the measuring method according to the EP 207 471 A1, in which the current measured value is related to the mean value, has not been reached.

Im folgenden werden Ausführungsbeispiele der Erfindung anhand der Zeichnung beschrieben.Exemplary embodiments of the invention are described below with reference to the drawing.

Die Figur zeigt eine schematische Darstellung einer Bearbeitungsstelle einer Falschzwirnkräuselmaschine. Der synthetische Faden 1 wird durch das Eingangslieferwerk 3 von der Vorlagespule 2 abgezogen. Die Texturierzone wird zwischen dem Eingangslieferwerk 3 und dem Abzugslieferwerk 9 gebildet. Sie umfaßt vor allem eine Heizschiene 4, eine Kühlschiene 5 und den Friktionsfalschdraller 6. Der Friktionsfalschdraller weist endlos bewegte Oberflächen auf, die quer zur Fadenachse bewegt sind und an denen der Faden anliegt. Diese Oberflächen erteilen dem Faden in Richtung Eingangslieferwerk eine Zwirnung, die sich in Richtung des Ausgangslieferwerks 9 wieder auflöst.The figure shows a schematic representation of a processing point of a false twist crimping machine. The synthetic thread 1 is drawn off from the supply spool 2 by the input delivery unit 3. The texturing zone is formed between the input delivery unit 3 and the take-off delivery unit 9. It mainly comprises a heating rail 4, a cooling rail 5 and the friction false twister 6. The friction false twister has endlessly moving surfaces which are moved transversely to the thread axis and against which the thread lies. These surfaces give the thread a twist in the direction of the input delivery unit, which dissolves again in the direction of the output delivery unit 9.

Zwischen dem Friktionsfalschdraller 6 und dem Ausgangslieferwerk 9 ist ein Fadenzugkraftmeßinstrument 8 angeordnet, durch welches die Fadenzugkraft, auch "Fadenspannung" genannt, gemessen und als Ausgangssignal weitergegeben wird. Es sei bemerkt, daß hinter dem Ausgangslieferwerk 9 eine Aufwicklung oder noch eine Zwischenbehandlung durch Erwärmung folgt.Between the friction false twister 6 and the output delivery mechanism 9, a thread tension measuring instrument 8 is arranged, by means of which the thread tension, also called "thread tension", is measured and passed on as an output signal. It should be noted that after the starting delivery unit 9 there is a winding or an intermediate treatment by heating.

Das Ausgangssignal Z des Zugkraftmessers 8, welches die gemessene Fadenzugkraft repräsentiert, wird über einen Filter 11 in einen Langzeitwert LW umgeformt. Der Langzeitwert LW wird gemeinsam mit einem Sollwert einer Regeleinrichtung 12 zugeführt. In der Regeleinrichtung 12 werden der Sollwert und der Langzeitwert miteinander verglichen und in eine Verstellgröße VS umgeformt. Durch die Verstellgröße VS wird ein Stellglied 7 verstellt, durch welches die Drallübertragung des Friktionsfalschdrallers 6 auf den Faden gesteuert wird.The output signal Z of the tensile force meter 8, which represents the measured thread tensile force, is converted into a long-term value LW by a filter 11. The long-term value LW is fed to a control device 12 together with a target value. In the control device 12, the target value and the long-term value are compared with one another and converted into an adjustment variable VS. The adjusting variable VS adjusts an actuator 7, by means of which the twist transmission of the friction false twister 6 onto the thread is controlled.

Das Ausgangssignal Z des Zugkraftmessers 8 wird ebenso wie das Verstellsignal VS einer Auswerteinrichtung 10 aufgegeben. In der Auswerteinrichtung 10 repräsentiert das Verstellsignal VS den Mittelwert. Die Überwachung des Verstellsignals innerhalb bestimmter Grenzen ersetzt also nach dieser Erfindung die Überwachung des Mittelwertes. Die Auswerteinrichtung 10 liefert eine Auswertung des aktuellen Ausgangssignals Z, welches die aktuell gemessene Fadenzugkraft repräsentiert entsprechend den Grundsätzen, die in der EP 207 471 A1 beschrieben sind. Das bedeutet: In der Auswerteinrichtung 10 ist ein oberer Grenzwert und ein unterer Grenzwert für das Verstellsignal VS eingespeichert (GOVS, GUVS). Wenn das Verstellsignal VS einen dieser Grenzwerte überschreitet, erfolgt ein Alarmsignal. Ferner wird in der Auswerteinrichtung 10 der Differenzwert DU zwischen dem aktuellen Ausgangssignal Z und dem Verstellsignal VS - nachdem beide zuvor in kompatible, vergleichbare Größen gewandelt worden sind - gebildet. Schließlich ist in der Auswerteinrichtung 10 der obere Grenzwert und der untere Grenzwert dieses Differenzsignales DU (GODU, GUDU) gespeichert, und es erfolgt ein Alarmsignal A, wenn das Differenzsignal DU zwischen dem Verstellsignal und dem aktuell gemessenen Ausgangssignal Z einen der Grenzwerte GODU, GUDU überschreitet.The output signal Z of the tensile force meter 8 as well as the adjustment signal VS of an evaluation device 10 are given. In the evaluation device 10, the adjustment signal VS represents the mean value. The monitoring of the adjustment signal within certain limits thus replaces the monitoring of the mean value according to this invention. The evaluation device 10 delivers an evaluation of the current output signal Z, which represents the currently measured thread tension according to the principles described in EP 207 471 A1. This means that an upper limit value and a lower limit value for the adjustment signal VS are stored in the evaluation device 10 (GOVS, GUVS). If the adjustment signal VS exceeds one of these limit values, an alarm signal is issued. Furthermore, the difference value DU between the current output signal Z and the adjustment signal VS - after both have previously been converted into compatible, comparable quantities - is formed in the evaluation device 10. Finally, the upper limit value and the lower limit value of this difference signal DU (GODU, GUDU) are stored in the evaluation device 10, and an alarm signal A occurs when the difference signal DU between the adjustment signal and the currently measured output signal Z exceeds one of the limit values GODU, GUDU .

Die Verstelleinrichtung 7 kann z.B. der Antriebsmotor des Friktionsfalschdrallers sein. In diesem Falle erfolgt in der Einrichtung 12 eine Umwandlung des Differenzsignals aus dem Langzeitwert und dem Sollwert in eine Größe, z.B. in eine Frequenz, die die Drehzahl des als Synchronmotor oder als Asynchronmotor ausgelegten Antriebsmotors 7 des Friktionsfalschdrallers bestimmt.The adjusting device 7 can be the drive motor of the friction false twister, for example. In this case, the device 12 converts the difference signal from the long-term value and the desired value into a variable, for example into a frequency, which determines the rotational speed of the drive motor 7 of the friction false twister designed as a synchronous motor or as an asynchronous motor.

Wenn der Friktionsfalschdraller aus drei Achsen besteht, die auf den Eckpunkten eines gleichseitigen Dreiecks angeordnet sind und auf welchen Scheiben aufgespannt sind, die sich im Zentrum des Dreiecks überlappen, so kann durch die Verstelleinrichtung 7 alternativ oder zusätzlich der Achsabstand verstellt werden, indem z.B. die Achsen auf jeweils einem Exzenter gelagert und die Exzenter in Abhängigkeit von dem Verstellsignal VS entsprechend verdreht werden (vgl. DE-AS 21 30 550).If the friction false twister consists of three axes, which are arranged on the corner points of an equilateral triangle and on which discs are spanned, which overlap in the center of the triangle, the adjusting device 7 can alternatively or additionally adjust the center distance, e.g. the axes are each supported on an eccentric and the eccentrics are rotated accordingly depending on the adjustment signal VS (cf. DE-AS 21 30 550).

Wenn der Friktionsfalschdraller aus zwei Scheiben besteht, die den Faden zwischen sich einklemmen und von denen eine elastische Scheibe durch eine Andrückeinrichtung gegen die andere Scheibe gedrückt wird (vgl. z.B. EP 22 743 A1), so kann durch das Verstellsignal VS die Anpreßkraft verstellt werden. Hierzu wird auch auf die DE-A1 33 06 594 verwiesen.If the friction false twister consists of two disks, which clamp the thread between them and of which an elastic disk is pressed against the other disk by a pressing device (see e.g. EP 22 743 A1), the contact pressure can be adjusted by the adjustment signal VS. For this purpose, reference is also made to DE-A1 33 06 594.

Wenn die Anpreßkraft durch einen Stößel ausgeübt wird, welcher durch einen Elektromagneten auf die Rückseite einer der Scheiben gedrückt wird, so ist das Verstellsignal (VS) als elektrischer Strom durch die Regeleinrichtung 12 auszugeben. Dieser elektrische Strom wird einerseits dem Elektromagneten zugeführt und bestimmt die Reibkraft, die auf den Faden ausgeübt wird. Damit ist dieser Strom auch dafür verantwortlich, daß die Fadenzugkraft nur kurzzeitig schwanken kann und - über längere Zeit gemessen - auf den der Regeleinrichtung (R) vorgegebenen Sollwert ausgeregelt wird.
Andererseits wird dieser elektrische Strom aber genutzt zur Ermittlung von sonstigen Fehlern, z.B. den oben erwähnten. Dazu werden der elektrische Strom und der laufende Meßwert - nach Umformung in vergleichbare Signalqualität - miteinander verglichen und festgestellt, ob der laufende Meßwert ein vorgegebenes Toleranzband zum elektrischen Strom verläßt und/oder es wird festgestellt, wann der elektrische Strom ein für ihn vorgegebenes zweites Toleranzband verläßt.
If the contact pressure is exerted by a plunger, which is pressed onto the back of one of the disks by an electromagnet, the adjustment signal (VS) is to be output as electrical current by the control device 12. On the one hand, this electric current is fed to the electromagnet and determines the frictional force that is exerted on the thread. This current is also responsible for the fact that the thread tension can fluctuate only briefly and - measured over a longer period - is adjusted to the setpoint specified by the control device (R).
On the other hand, this electrical current is used to determine other errors, such as those mentioned above. For this purpose, the electrical current and the current measured value - after conversion into comparable signal quality - are compared with one another and it is determined whether the current measured value leaves a predefined tolerance band for the electrical current and / or it is determined when the electrical current leaves a predefined second tolerance band .

BEZUGSZEICHENAUFSTELLUNGREFERENCE SIGN LISTING

11
Faden thread
22nd
Vorlagespule Supply spool
33rd
Lieferwerk Delivery plant
44th
Heizer Stoker
55
Kühlschiene Cooling rail
66
Friktionsfalschdraller Frictional false twister
77
Verstelleinrichtung Adjustment device
88th
Fadenzugkraftmesser Thread tension meter
99
Lieferwerk Delivery plant
1010th
Auswerteinrichtung Evaluation device
1111
Filter filter
1212
Wandler Converter

Claims (3)

Verfahren zur Überwachung der Fadenzugkraft des laufenden Fadens in der Texturierzone einer vielstelligen Falschzwirnkräuselmaschine,
mit den folgenden Merkmalen:
Die Fadenzugkraft wird laufend oder pulsierend gemessen (Meßsignal: U);
ein Alarmsignal (A) wird an der Meßstelle erzeugt, wenn ein den laufenden Mittelwert (MU) des laufenden Meßwert repräsentierendes Signal (VS) ein vorgegebenes Toleranzfeld zwischen einem
oberen Grenzwert (GOVS) des Signals (VS) und einem unteren Grenzwert (GUVS) des Signals (VS) verläßt und/oder wenn ein aus dem Signal (VS) und dem laufenden Meßwert laufend gebildetes Differenzsignal (DU) ein zweites vorgegebenes Toleranzfeld zwischen einem oberen Grenzwert des Differenzwertes (GODU) und einem unteren Grenzwert des Differenzwertes (GUDU) verläßt, und mit dem kennzeichnenden Merkmal:
Die Fadenspannung wird dadurch ausgeregelt, daß die Fadenspannung über ein Zeitfilter in ein Verstellsignal (VS) umgewandelt und durch das Verstellsignal (VS) die Größe und/oder die Komponentenverteilung der Reibkraft des Falschdrallgebers am Faden gesteuert wird; das Verstellsignal (VS) wird als das den laufenden Mittelwert (MU) des laufenden Meßwerts (M) repräsentierende Signal zur Qualitätsüberwachung genutzt.
Method for monitoring the thread tension of the running thread in the texturing zone of a multi-digit false twist crimping machine,
with the following characteristics:
The thread tension is measured continuously or pulsating (measuring signal: U);
an alarm signal (A) is generated at the measuring point when a signal (VS) representing the current mean (MU) of the current measured value has a predetermined tolerance field between a
leaves the upper limit value (GOVS) of the signal (VS) and a lower limit value (GUVS) of the signal (VS) and / or if a difference signal (DU) continuously formed from the signal (VS) and the current measured value leaves a second predetermined tolerance field between one leaves the upper limit value of the difference value (GODU) and a lower limit value of the difference value (GUDU), and with the characteristic feature:
The thread tension is corrected in that the thread tension is converted into an adjustment signal (VS) via a time filter and the size and / or the component distribution of the frictional force of the false twister on the thread is controlled by the adjustment signal (VS); the adjustment signal (VS) is used as the signal for quality monitoring representing the current mean value (MU) of the current measured value (M).
Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß
durch das Verstellsignal (VS) die Geschwindigkeit des Friktionsdrallgebers gesteuert wird.
Method according to claim 1,
characterized in that
the speed of the friction swirl generator is controlled by the adjustment signal (VS).
Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß
durch das Verstellsignal (VS) die Reibkraft zwischen den bewegten Oberflächen des Friktionsfalschdrallers und dem Faden verstellt wird,
indem bei einem Friktionsfalschdraller mit zwei gegeneinander bewegten Oberflächen, zwischen denen der Faden geführt wird, die Anpreßkraft der Oberflächen auf den Faden verstellt wird oder
bei einem Friktionsfalschdraller mit drei Achsen und darauf aufgespannten Scheiben, die sich im Mittelpunkt zwischen den Achsen überlappen, der Achsabstand verstellt wird.
Method according to claim 1,
characterized in that
the friction signal between the moving surfaces of the friction false twister and the thread is adjusted by the adjustment signal (VS),
by adjusting the contact pressure of the surfaces on the thread in a friction false twister with two surfaces moving against one another, between which the thread is guided, or
In the case of a friction false twister with three axles and disks clamped thereon, which overlap in the center between the axles, the center distance is adjusted.
EP91100967A 1990-01-26 1991-01-25 Method for measuring the traction force of a yarn Expired - Lifetime EP0439183B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4002211 1990-01-26
DE4002211 1990-01-26
DE4005074 1990-02-17
DE4005074 1990-02-17

Publications (2)

Publication Number Publication Date
EP0439183A1 true EP0439183A1 (en) 1991-07-31
EP0439183B1 EP0439183B1 (en) 1994-04-27

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ID=25889413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91100967A Expired - Lifetime EP0439183B1 (en) 1990-01-26 1991-01-25 Method for measuring the traction force of a yarn

Country Status (5)

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US (1) US5146739A (en)
EP (1) EP0439183B1 (en)
DE (1) DE59101465D1 (en)
ES (1) ES2051528T3 (en)
RU (1) RU2043630C1 (en)

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DE4329136A1 (en) * 1992-08-31 1994-03-03 Murata Machinery Ltd False twisting assembly - has sensor to register back twist tension for control to correct the operation to maintain nominal values
DE4435923B4 (en) * 1993-10-19 2008-01-24 Oerlikon Textile Gmbh & Co. Kg Apparatus and method for uniformly texturing a running thread

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TW354078U (en) * 1991-01-17 1999-03-01 Barmag Barmer Maschf Apparatus for monitoring the tension of an advancing yarn
GB9202397D0 (en) * 1992-02-05 1992-03-18 British Tech Group Texturing yarn
DE59300117D1 (en) * 1992-02-10 1995-05-11 Barmag Barmer Maschf Process for controlling the thread tension of the running thread in a false twist texturing machine.
EP0604876B1 (en) * 1992-12-31 1999-07-14 Zellweger Uster, Inc. Methods for optimally controlling fiber processing machines
DE59611441D1 (en) * 1995-06-30 2007-09-20 Oerlikon Textile Gmbh & Co Kg Method for controlling the thread tension
JP3147024B2 (en) * 1997-03-07 2001-03-19 村田機械株式会社 False twisting device
JP3147027B2 (en) * 1997-03-14 2001-03-19 村田機械株式会社 Tension control system in false twisting machine
JP3331356B2 (en) * 1998-06-12 2002-10-07 村田機械株式会社 Tension control method by fluff controller
US6163733A (en) 1999-04-06 2000-12-19 Rubel; Laurence P. Monitor and malfunction predictor for textile machines
DE102006040065A1 (en) * 2006-08-26 2008-02-28 Oerlikon Textile Gmbh & Co. Kg Procedure for thermal treatment of a running yarn at a twisting machine with workplaces, comprises passing the yarn by a delivery mechanisms to a device for the thermal treatment of the yarn in tension free manner and spooling the yarn
WO2008151454A1 (en) * 2007-06-13 2008-12-18 Uster Technologies Ag Device and method for testing yarn
CN105274723B (en) * 2015-10-26 2017-03-29 武汉纺织大学 A kind of ultraphotic clean weft-knitting method of many fibrous yarn lines
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DE4435923B4 (en) * 1993-10-19 2008-01-24 Oerlikon Textile Gmbh & Co. Kg Apparatus and method for uniformly texturing a running thread

Also Published As

Publication number Publication date
RU2043630C1 (en) 1995-09-10
ES2051528T3 (en) 1994-06-16
US5146739A (en) 1992-09-15
DE59101465D1 (en) 1994-06-01
EP0439183B1 (en) 1994-04-27

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