EP1318097B1 - Method and device for controlling the yarn tension in a textile machine and use of the method - Google Patents

Method and device for controlling the yarn tension in a textile machine and use of the method Download PDF

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Publication number
EP1318097B1
EP1318097B1 EP20020020139 EP02020139A EP1318097B1 EP 1318097 B1 EP1318097 B1 EP 1318097B1 EP 20020020139 EP20020020139 EP 20020020139 EP 02020139 A EP02020139 A EP 02020139A EP 1318097 B1 EP1318097 B1 EP 1318097B1
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EP
European Patent Office
Prior art keywords
thread
tension
disturbances
thread tension
supply
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EP20020020139
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German (de)
French (fr)
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EP1318097A1 (en
Inventor
Thomas Burger
Marc Schaad
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SSM Schaerer Schweiter Mettler AG
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SSM Schaerer Schweiter Mettler AG
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Priority claimed from EP01128877A external-priority patent/EP1319622A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/005—Means compensating the yarn tension in relation with its moving due to traversing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a method for controlling the thread tension on a textile machine, on which the thread is withdrawn by a thread delivery from a supply and fed to a thread laying, wherein a controlled variable for the delivery speed of the thread is obtained
  • the in the EP-A-0 950 742 described device for controlling the yarn feed on a textile machine includes a sensor for measuring the yarn tension, means for measuring the yarn delivery speed and a controller for precise adjustment of these two parameters, preferably the yarn delivery speed on the basis of Thread tension is regulated.
  • a similar device is in the EP-A-0 875 479 Schrer Schweiter Mettler AG described.
  • the EP 0 950 631 A1 describes a device for controlling the thread tension on a textile machine with a motor-driven delivery mechanism for a thread and a thread laying device with a thread guide for winding the thread on a Gammon.
  • the DE 4129803 A1 describes a method for controlling the thread tension on a textile machine on which the thread is withdrawn by a thread delivery from a supply. It is obtained a control variable for the thread tension of the thread, wherein initially a distinction between periodic and non-periodic disturbances of the thread tension is made and the non-periodic disturbances are compensated by the controlled variable.
  • an adaptive adaptation of the delivery speed takes place on the basis of the calculated periodic disturbances, in which the delivery speed is increased or reduced as a function of the respective position of the thread guide.
  • the solution according to the invention is based on the recognition that the variations in the thread tension are not only caused by one cause, but are based on two main causes, namely the disturbances caused by the withdrawal from the supply bobbin and by the thread transfer, with the disturbances due to the withdrawal.
  • a first preferred embodiment of the method according to the invention is characterized in that the thread tension is measured and the stochastic disturbances measured in the process are likewise taken into account for the said controlled variable. As a result, the stochastic disturbances are compensated, so that a practically constant value of the thread tension is achieved.
  • the adaptive adaptation takes place such that the thread tension at the reversal points and in the middle of the movement path of the thread guide reaches the same value.
  • the invention further relates to a device for controlling the thread tension on a textile machine, with a motor-driven delivery mechanism for the thread and a thread laying with a thread guide for winding the thread on a yarn carrier.
  • the device according to the invention is characterized in that the drive of the delivery mechanism is regulated in such a way that a compensation of the periodic disturbances of the thread tension caused by the thread transfer takes place.
  • a first preferred embodiment of the device according to the invention is characterized in that a sensor for measuring the thread tension is arranged between delivery mechanism and thread transfer and the drive of the delivery mechanism is regulated in such a way that, in addition to the compensation of the periodic disturbances, a compensation of the stochastic disturbances of the thread tension measured by the sensor takes place ,
  • a second preferred embodiment of the inventive device is characterized in that the compensation of the periodic disturbances of the thread tension by an adaptive adjustment of the drive of the delivery mechanism based on a calculation of the thread tension for the different positions of the thread guide takes place.
  • said calculation takes place taking into account the current thread speed.
  • the position of the thread guide is either determined by a sensor or it is predetermined by a control stage.
  • a further preferred embodiment of the device according to the invention is characterized in that a first control stage for the drive of the yarn carrier and the thread laying and a second control stage connected thereto are provided for the drive of the delivery mechanism, and that the second control stage data on the current position of the thread guide and the current thread tension are supplied.
  • the invention further relates to an application of said method to winding machines.
  • the winding station consists according to presentation of a Aufsteckung 1 for receiving a feed bobbin 2 with a thread F, a thread insulation 3, a driven by a motor 4 delivery 5, a sensor 6 for measuring the tension of the thread F and a winding unit 7.
  • the latter consists of a by a motor (not shown) drivable spindle 8 for receiving and holding a bobbin 9, on which a coil 10 is wound, and from a thread laying 11.
  • the drive of the coil 10 via a motor-driven friction roller on which the Coil 10 rests (see EP-A-1 125 878 ).
  • the thread laying 11 contains, as the most essential element, a yarn guide 12, which performs an oscillating traversing movement along the axis of the spool 10.
  • a yarn guide 12 which performs an oscillating traversing movement along the axis of the spool 10.
  • the yarn guide 12 is mounted on a sliding in a rail or groove-like guide back and forth slide 13, on which a traversing element 14 engages.
  • This is designed as a flexible and traversing stiff body for transmitting tensile forces and, for example, by a string, a wire, a metal cable, a flat, toothed or V-belt, a metal band, a chain or the like. Formed.
  • the traversing element 14 passes over two rollers 15 and 16, one of which, according to the roller 16, serves as a drive wheel for driving the traversing element 14.
  • the drive wheel 16 is driven by a servomotor (not shown), preferably a stepping motor.
  • the drive wheel 16 is mounted directly on the motor shaft.
  • the motor is a sensor (not shown) for detecting the rotational position of the drive wheel 16 and thus associated with the traversing position of the yarn guide 12.
  • this sensor is on the EP-A-0 829 444 and those corresponding to it US-A-5,918,829 directed.
  • the sensor is a consisting of a transmitting and a receiving diode photoelectric sensor, which scans the movement of the drive wheel 16 or a rigidly connected to this disc.
  • the drive wheel 16 or the disc is provided for this purpose with suitable optically scannable markers, for example, arranged along a circle holes or slots.
  • the drive motors of the spindle 8 and the drive wheel 16, the sensor for the traversing position of the yarn guide 12 and any other sensors, such as the speed of the coil 10 are connected to a spindle control 17, which said motors based on programmed winding parameters and winding laws and the controls data supplied by the sensors.
  • the spindle control 17 is also connected to a delivery control 18, which in turn is connected to the yarn tension sensor 6 and to the drive motor 4 of the delivery mechanism 5.
  • the yarn tension sensor 6 measures the so-called stochastic variations in yarn tension, that is, disturbances caused by the yarn withdrawal from the supply spool 2 and the delivery 5, and notifies these deviations to the delivery control 18.
  • the delivery control 18 calculates those for correcting these deviations Required controlled variable and supplies to the motor 4, a corresponding control signal.
  • the difference of the thread tension to a reference value can be calculated for each point of the traversing movement, which takes place in the delivery control 18, which receives the position information of the thread guide 12 from the spindle control 17 for this purpose.
  • the spindle controller 18 calculates a required for the correction of the periodic voltage fluctuations controlled variable and performs with both said control variables an adaptive control of the thread delivery to compensate for the voltage fluctuations.
  • the adaptive control takes place in such a way that the same thread tension prevails at the reversal points and in the center of the coil, the periodic disturbance caused by the thread laying 11 is virtually completely compensated. Since the maximum amplitude of the periodic voltage fluctuations is a multiple, for example three to five times, the maximum amplitude of the stochastic voltage fluctuations, the adaptive control of the yarn delivery compensates for the majority of the disturbances.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Regelung der Fadenspannung auf einer Textilmaschine, auf welcher der Faden durch eine Fadenlieferung von einem Vorrat abgezogen und einer Fadenverlegung zugeführt wird, wobei eine Regelgrösse für die Liefergeschwindigkeit des Fadens gewonnen wirdThe present invention relates to a method for controlling the thread tension on a textile machine, on which the thread is withdrawn by a thread delivery from a supply and fed to a thread laying, wherein a controlled variable for the delivery speed of the thread is obtained

Für verschiedene Prozesse in der Textilindustrie, beispielsweise für den Spulprozess, ist eine konstante Fadenspannung eine der Voraussetzungen für eine optimale und einheitliche Qualität des bei dem betreffenden Prozess hergestellten Produkts. Trotzdem kommt es beim Spulprozess immer wieder vor, dass in Abhängigkeit von der Qualität der Vorlagespule, von eventuell vorgenommenen Fadenbehandlungen wie beispielsweise Färben und dergleichen, und von der Spulgeschwindigkeit, die Fadenspannung relativ stark schwankt. Aus diesem Grund wurden verschiedene Einrichtungen vorgeschlagen, die eine konstante Fadenspannung ermöglichen sollen, beispielsweise die in der DE-C-38 24 034 und in der EP-A-0 950 742 beschriebenen.For various processes in the textile industry, for example for the winding process, a constant yarn tension is one of the prerequisites for an optimal and uniform quality of the product produced in the process in question. Nevertheless, it often happens during the winding process that, depending on the quality of the supply bobbin, any possible thread treatments such as dyeing and the like, and the winding speed, the yarn tension fluctuates relatively strongly. For this reason, various devices have been proposed to allow a constant thread tension, for example, in the DE-C-38 24 034 and in the EP-A-0 950 742 described.

Bei der in der DE-C-38 24 034 beschriebenen Einrichtung sind bei einer fadenverbrauchenden Maschine, insbesondere einer Rundstrickmaschine, die mehrere fadenverarbeitende Stellen aufweist, entsprechend viele Liefereinrichtungen für das fadenförmige Gut vorgesehen. An jeder Lieferstelle befindet sich eine Fadenspannungseinrichtung, die mit dem fadenförmigen Gut zusammen wirkt und einen Geber und eine Messschaltung enthält.When in the DE-C-38 24 034 described device are provided in a yarn-consuming machine, in particular a circular knitting machine having a plurality of yarn processing sites, corresponding to many delivery facilities for the filamentary Good. At each delivery point there is a thread tensioning device which cooperates with the thread-like material and contains a sensor and a measuring circuit.

Die in der EP-A-0 950 742 beschriebene Einrichtung zur Steuerung der Garnzufuhr an einer Textilmaschine, wie beispielsweise einer Strick-, Wirk- oder Spulmaschine, enthält einen Sensor zu Messung der Fadenspannung, Mittel zur Messung der Fadenliefergeschwindigkeit und eine Steuerung zur präzisen Einstellung dieser beiden Parameter, wobei vorzugsweise die Fadenliefergeschwindigkeit anhand der Fadenspannung geregelt wird. Ein ähnliche Einrichtung ist in der EP-A-0 875 479 der Schärer Schweiter Mettler AG beschrieben.The in the EP-A-0 950 742 described device for controlling the yarn feed on a textile machine, such as a knitting, kneading or winding machine, includes a sensor for measuring the yarn tension, means for measuring the yarn delivery speed and a controller for precise adjustment of these two parameters, preferably the yarn delivery speed on the basis of Thread tension is regulated. A similar device is in the EP-A-0 875 479 Schärer Schweiter Mettler AG described.

Bei Spulmaschinen besteht das Problem, dass durch die lineare Bewegung der Fadenverlegeeinheit der Faden verkürzt oder verlängert wird und dadurch die Fadenspannung kurzzeitig stark ansteigt beziehungsweise absinkt. Diese Spannungsschwankungen können aber durch die bekannten Einrichtungen wegen der durch die Trägheit des Sensors und der Steuerung bedingten Zeitverzögerung nicht ausgeregelt werden.In winding machines there is the problem that is shortened or lengthened by the linear movement of the yarn laying unit, the thread and thus the thread tension increases or decreases sharply for a short time. These voltage fluctuations can not be compensated by the known devices because of the time delay caused by the inertia of the sensor and the control.

Die EP 0 950 631 A1 beschreibt eine Vorrichtung zur Regelung der Fadenspannung auf einer Textilmaschine mit einem motorisch angetriebenen Lieferwerk für einen Faden und einer Fadenverlegeeinrichtung mit einem Fadenführer zum Aufwickeln des Fadens auf einen Gamträger.The EP 0 950 631 A1 describes a device for controlling the thread tension on a textile machine with a motor-driven delivery mechanism for a thread and a thread laying device with a thread guide for winding the thread on a Gamträger.

Die DE 4129803 A1 beschreibt ein Verfahren zur Regelung der Fadenspannung auf einer Textilmaschine, auf welcher der Faden durch eine Fadenlieferung von einem Vorrat abgezogen wird. Es wird eine Regelgröße für die Fadenspannung des Fadens gewonnen, wobei zunächst eine Unterscheidung zwischen periodischen und nicht periodischen Störungen der Fadenspannung vorgenommen wird und die nicht periodischen Störungen über die Regelgröße ausgeglichen werden.The DE 4129803 A1 describes a method for controlling the thread tension on a textile machine on which the thread is withdrawn by a thread delivery from a supply. It is obtained a control variable for the thread tension of the thread, wherein initially a distinction between periodic and non-periodic disturbances of the thread tension is made and the non-periodic disturbances are compensated by the controlled variable.

Durch die Erfindung sollen nun die bekannten Verfahren und Einrichtungen zur Regelung der Fadenspannung auf einer Textilmaschine so verbessert werden, dass auch der Spuiprozess in Richtung auf eine Qualitäts- und/oder Nutzeffektserhöhung deutlich verbessert wird.By means of the invention, the known methods and devices for regulating the thread tension on a textile machine are now to be improved in such a way that the spooling process in the direction of a quality and / or efficiency increase is also markedly improved.

Die der Erfindung zugrunde liegende Aufgabe wird durch die Gegenstände der unabhängigen Patentansprüche gelöst,
Bei einem Verfahren der eingangs genannten Art erfindungsgemäss eine Unterscheidung der die Schwankungen der Fadenspannung verursachenden Störungen nach periodischen und stochastischen Störungen, und die periodischen Störungen werden berechnet und für die genannte Regelgröße berücksichtigt.The object underlying the invention is solved by the subject matters of the independent claims,
In a method of the type mentioned according to the invention a distinction of the fluctuations of the thread tension causing disturbances after periodic and stochastic disturbances, and the periodic disturbances are calculated and taken into account for said control variable.

Dabei erfolgt anhand der berechneten periodischen Störungen eine adaptive Anpassung der Liefergeschwindigkeit, bei welcher in Abhängigkeit von der jeweiligen Position des Fadenführers die Liefergeschwindigkeit erhöht oder reduziert wird.In this case, an adaptive adaptation of the delivery speed takes place on the basis of the calculated periodic disturbances, in which the delivery speed is increased or reduced as a function of the respective position of the thread guide.

Die erfindungsgemässe Lösung beruht auf der Erkenntnis, dass die Schwankungen der Fadenspannung nicht nur eine einzige Ursache haben, sondern auf zwei Hauptursachen beruhen, nämlich auf den vom Abzug von der Vorlagespule und auf den von der Fadenverlegung verursachten Störungen, wobei die durch den Abzug bedingten Störungen zufällig und die durch die Fadenverlegung bedingten Störungen geometrisch bedingt sind und berechnet werden können, Und da Untersuchungen gezeigt haben, dass die periodischen Störungen wesentlich grösser sind als die stochastischen, ergibt sich durch die rechnerische Berücksichtigung der periodischen Störungen bereits eine starke Glättung der Fadenspannung. Und diese starke Glättung der Fadenspannung wird erzielt, ohne dass ein Sensor für die Fadenspannung erforderlich wäre, was eine merkliche Kosteneinsparung ergibt.The solution according to the invention is based on the recognition that the variations in the thread tension are not only caused by one cause, but are based on two main causes, namely the disturbances caused by the withdrawal from the supply bobbin and by the thread transfer, with the disturbances due to the withdrawal Because investigations have shown that the periodic perturbations are considerably larger than the stochastic ones, the calculation of the periodic perturbations already results in a strong smoothing of the thread tension. And this high level of thread tensioning is achieved without the need for a thread tension sensor, resulting in significant cost savings.

Eine erste bevorzugte Ausführungsform des erfindungsgemässen Verfahrens ist dadurch gekennzeichnet, dass die Fadenspannung gemessen und die dabei gemessenen stochastischen Störungen ebenfalls für die genannte Regelgröße berücksichtigt werden. Dadurch werden auch die stochastischen Störungen ausgeregelt, so dass ein praktisch gleichbleibender Wert der Fadenspannung erzielt wird.A first preferred embodiment of the method according to the invention is characterized in that the thread tension is measured and the stochastic disturbances measured in the process are likewise taken into account for the said controlled variable. As a result, the stochastic disturbances are compensated, so that a practically constant value of the thread tension is achieved.

Gemäss einer weiteren bevorzugten Ausführungsform erfolgt die adaptive Anpassung derart, dass die Fadenspannung an den Umkehrpunkten und in der Mitte der Bewegungsbahn des Fadenführers den gleichen Wert erreicht.
Die Erfindung betrifft weiter eine Vorrichtung zur Regelung der Fadenspannung auf einer Textilmaschine, mit einem motorisch angetriebenen Lieferwerk für den Faden und einer Fadenverlegung mit einem Fadenführer zum Aufwickeln des Fadens auf einen Garnträger.According to a further preferred embodiment, the adaptive adaptation takes place such that the thread tension at the reversal points and in the middle of the movement path of the thread guide reaches the same value.
The invention further relates to a device for controlling the thread tension on a textile machine, with a motor-driven delivery mechanism for the thread and a thread laying with a thread guide for winding the thread on a yarn carrier.

Die erfindungsgemässe Vorrichtung ist dadurch gekennzeichnet, dass der Antrieb des Lieferwerks so geregelt ist, dass ein Ausgleich der durch die Fadenverlegung bedingten periodischen Störungen der Fadenspannung erfolgt.The device according to the invention is characterized in that the drive of the delivery mechanism is regulated in such a way that a compensation of the periodic disturbances of the thread tension caused by the thread transfer takes place.

Eine erste bevorzugte Ausführungsform der erfindungsgemässen Vorrichtung ist dadurch gekennzeichnet, dass zwischen Lieferwerk und Fadenverlegung ein Sensor zur Messung der Fadenspannung angeordnet und der Antrieb des Lieferwerks so geregelt ist, dass zusätzlich zum Ausgleich der periodischen Störungen ein Ausgleich der vom Sensor gemessenen stochastischen Störungen der Fadenspannung erfolgt.A first preferred embodiment of the device according to the invention is characterized in that a sensor for measuring the thread tension is arranged between delivery mechanism and thread transfer and the drive of the delivery mechanism is regulated in such a way that, in addition to the compensation of the periodic disturbances, a compensation of the stochastic disturbances of the thread tension measured by the sensor takes place ,

Eine zweite bevorzugte Ausführungsform der erfindungsgemässen Vorrichtung ist dadurch gekennzeichnet, dass der Ausgleich der periodischen Störungen der Fadenspannung durch eine adaptive Anpassung des Antriebs des Lieferwerks anhand einer Berechnung der Fadenspannung für die verschiedenen Positionen des Fadenführers erfolgt.A second preferred embodiment of the inventive device is characterized in that the compensation of the periodic disturbances of the thread tension by an adaptive adjustment of the drive of the delivery mechanism based on a calculation of the thread tension for the different positions of the thread guide takes place.

Vorzugsweise erfolgt die genannte Berechnung unter Mitberücksichtigung der momentanen Fadengeschwindigkeit. Die Position des Fadenführers wird entweder durch einen Sensor bestimmt oder sie ist von einer Steuerstufe vorgegeben.Preferably, said calculation takes place taking into account the current thread speed. The position of the thread guide is either determined by a sensor or it is predetermined by a control stage.

Eine weitere bevorzugte Ausführungsform der erfindungsgemässen Vorrichtung ist dadurch gekennzeichnet, dass eine erste Steuerstufe für den Antrieb des Garnträgers und der Fadenverlegung und eine mit dieser verbundene zweite Steuerstufe für den Antrieb des Lieferwerks vorgesehen sind, und dass der zweiten Steuerstufe Daten über die momentane Position des Fadenführers und die momentane Fadenspannung zugeführt sind.A further preferred embodiment of the device according to the invention is characterized in that a first control stage for the drive of the yarn carrier and the thread laying and a second control stage connected thereto are provided for the drive of the delivery mechanism, and that the second control stage data on the current position of the thread guide and the current thread tension are supplied.

Die Erfindung betrifft weiter eine Anwendung des genannten Verfahrens auf Spulmaschinen.The invention further relates to an application of said method to winding machines.

Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels und der einzigen Zeichnung näher erläutert; diese zeigt eine schematische Darstellung der Spulstation einer Spulmaschine. Die Spulstation besteht darstellungsgemäss aus einer Aufsteckung 1 zur Aufnahme einer Vorlagespule 2 mit einem Faden F, einer Fadendämmung 3, einem von einem Motor 4 angetriebenen Lieferwerk 5, einem Sensor 6 zur Messung der Spannung des Fadens F und einem Spulaggregat 7. Das letztere besteht aus einer durch einen Motor (nicht dargestellt) antreibbaren Spindel 8 zur Aufnahme und Halterung einer Spulenhülse 9, auf die eine Spule 10 aufgewickelt wird, und aus einer Fadenverlegung 11. Alternativ kann der Antrieb der Spule 10 über eine motorisch angetriebene Reibwalze erfolgen, auf der die Spule 10 aufliegt (siehe dazu EP-A-1 125 878 ). Die Fadenverlegung 11 enthält als wesentlichstes Element einen Fadenführer 12, der entlang der Achse der Spule 10 eine oszillierende Changierbewegung ausführt. Eine solche Fadenverlegung ist beispielsweise in der EP-A-0 829 444 (= US-A-5 918 829 ), der EP-A-1 125 878 , der EP-A-1 209 114 und der EP-A-1 219 559 beschrieben, auf welche alle hiermit ausdrücklich Bezug genommen wird.In the following the invention will be explained in more detail with reference to an embodiment and the single drawing; this shows a schematic representation of the winding station of a winder. The winding station consists according to presentation of a Aufsteckung 1 for receiving a feed bobbin 2 with a thread F, a thread insulation 3, a driven by a motor 4 delivery 5, a sensor 6 for measuring the tension of the thread F and a winding unit 7. The latter consists of a by a motor (not shown) drivable spindle 8 for receiving and holding a bobbin 9, on which a coil 10 is wound, and from a thread laying 11. Alternatively, the drive of the coil 10 via a motor-driven friction roller on which the Coil 10 rests (see EP-A-1 125 878 ). The thread laying 11 contains, as the most essential element, a yarn guide 12, which performs an oscillating traversing movement along the axis of the spool 10. Such a thread laying is for example in the EP-A-0 829 444 (= US-A-5,918,829 ), of the EP-A-1 125 878 , of the EP-A-1 209 114 and the EP-A-1 219 559 described, all of which are hereby incorporated by reference.

Der Fadenführer 12 ist auf einem in einer schienen- oder nutenartigen Führung hin und her bewegbaren Gleitorgan 13 befestigt, an welchem ein Changierelement 14 angreift. Dieses ist als flexibles und in Changierrichtung steifes Organ zur Übertragung von Zugkräften ausgebildet und beispielsweise durch eine Saite, einen Draht, ein Metallseil, einen Flach-, Zahn- oder Keilriemen, ein Metallband, eine Kette oder dgl. gebildet. Das Changierelement 14 läuft über zwei Rollen 15 und 16, von denen die eine, darstellungsgemäss die Rolle 16, als Treibrad für den Antrieb des Changierelements 14 dient.The yarn guide 12 is mounted on a sliding in a rail or groove-like guide back and forth slide 13, on which a traversing element 14 engages. This is designed as a flexible and traversing stiff body for transmitting tensile forces and, for example, by a string, a wire, a metal cable, a flat, toothed or V-belt, a metal band, a chain or the like. Formed. The traversing element 14 passes over two rollers 15 and 16, one of which, according to the roller 16, serves as a drive wheel for driving the traversing element 14.

Das Treibrad 16 ist von einem Servomotor (nicht dargestellt), vorzugsweise einem Schrittmotor, angetrieben. Vorzugsweise ist das Treibrad 16 direkt auf der Motorwelle befestigt. Dem Motor ist ein Sensor (nicht dargestellt) zur Detektion der Drehposition des Treibrades 16 und damit der Changierposition des Fadenführers 12 zugeordnet. Bezüglich dieses Sensors wird auf die EP-A-0 829 444 und die zu dieser korrespondierende US-A-5 918 829 verwiesen. Der Sensor ist ein aus einer Sende- und einer Empfangsdiode bestehender fotoelektrischer Sensor, der die Bewegung des Treibrads 16 oder einer mit diesem starr verbundenen Scheibe abtastet. Das Treibrad 16 oder die Scheibe ist zu diesem Zweck mit geeigneten optisch abtastbaren Markierungen, beispielsweise mit entlang eines Kreises angeordneten Löchern oder Schlitzen, versehen.The drive wheel 16 is driven by a servomotor (not shown), preferably a stepping motor. Preferably, the drive wheel 16 is mounted directly on the motor shaft. The motor is a sensor (not shown) for detecting the rotational position of the drive wheel 16 and thus associated with the traversing position of the yarn guide 12. Regarding this sensor is on the EP-A-0 829 444 and those corresponding to it US-A-5,918,829 directed. The sensor is a consisting of a transmitting and a receiving diode photoelectric sensor, which scans the movement of the drive wheel 16 or a rigidly connected to this disc. The drive wheel 16 or the disc is provided for this purpose with suitable optically scannable markers, for example, arranged along a circle holes or slots.

Die Antriebsmotoren der Spindel 8 und des Treibrades 16, der Sensor für die Changierposition des Fadenführers 12 sowie eventuelle weitere Sensoren, beispielsweise für die Drehzahl der Spule 10, sind mit einer Spindelsteuerung 17 verbunden, welche die genannten Motoren anhand von programmierten Spulparametern und Wickelgesetzen sowie der von den Sensoren gelieferten Daten steuert. Die Spindelsteuerung 17 ist ausserdem mit einer Liefersteuerung 18 verbunden, welche ihrerseits mit dem Fadenspannungssensor 6 und mit dem Antriebsmotor 4 des Lieferwerks 5 verbunden ist.The drive motors of the spindle 8 and the drive wheel 16, the sensor for the traversing position of the yarn guide 12 and any other sensors, such as the speed of the coil 10 are connected to a spindle control 17, which said motors based on programmed winding parameters and winding laws and the controls data supplied by the sensors. The spindle control 17 is also connected to a delivery control 18, which in turn is connected to the yarn tension sensor 6 and to the drive motor 4 of the delivery mechanism 5.

Der Fadenspannungssensor 6 misst die sogenannten stochastischen Schwankungen der Fadenspannung, das sind Störungen, die durch den Fadenabzug von der Vorlagespule 2 und durch die Lieferung 5 verursacht sind, und meldet diese Abweichungen an die Liefersteuerung 18. Die Liefersteuerung 18 berechnet die für die Korrektur dieser Abweichungen erforderliche Regelgrösse und liefert an den Motor 4 ein entsprechendes Regelsignal.The yarn tension sensor 6 measures the so-called stochastic variations in yarn tension, that is, disturbances caused by the yarn withdrawal from the supply spool 2 and the delivery 5, and notifies these deviations to the delivery control 18. The delivery control 18 calculates those for correcting these deviations Required controlled variable and supplies to the motor 4, a corresponding control signal.

Neben den genannten stochastischen Schwankungen der Fadenspannung kommt es zusätzlich zu periodischen Schwankungen, die durch die Fadenverlegung 11 verursacht sind. Ein Blick auf die Geometrie der Fadenverlegung zeigt, dass wegen der linearen Bewegung des Fadenführers 12, die Länge des Fadens F zwischen diesem und dem Fadenspannungssensor 6 an den Umkehrpunkten der Changierbewegung grösser ist als in der Mitte. Diese Verhältnisse sind durch den gestrichelten Kreisbogen B angedeutet, wobei der Längenunterschied zwischen den beiden Extremwerten mit dem Bezugszeichen A bezeichnet ist. Diesem Längenunterschied entspricht ein Unterschied der Fadenspannung, welche an den Umkehrpunkten grösser ist als in der Mitte. Die Fadenspannung erreicht also an einem Umkehrpunkt ihren Höchstwert, nimmt gegen die Mitte hin ab und erreicht dort ihren Tiefstwert und steigt dann bis zum Umkehrpunkt wieder an.In addition to the mentioned stochastic fluctuations in the thread tension, there are in addition to periodic fluctuations caused by the thread laying 11. A look at the geometry of the thread laying shows that because of the linear movement of the thread guide 12, the length of the thread F between this and the thread tension sensor 6 at the reversal points of the traversing movement is greater than in the middle. These relationships are indicated by the dashed circular arc B, wherein the difference in length between the two extreme values is denoted by the reference symbol A. This difference in length corresponds to a difference in the thread tension, which is greater at the reversal points than in the middle. The thread tension thus reaches its maximum value at a reversal point, decreases towards the middle and reaches its lowest value there and then rises again up to the reversal point.

Da die Geometrie der Fadenverlegung 11 bekannt ist, kann für jeden Punkt der Changierbewegung der Unterschied der Fadenspannung zu einem Bezugswert berechnet werden, was in der Liefersteuerung 18 erfolgt, welche zu diesem Zweck von der Spindelsteuerung 17 die Positionsangaben des Fadenführers 12 erhält. Die Spindelsteuerung 18 berechnet eine für die Korrektur der periodischen Spannungsschwankungen erforderliche Regelgrösse und führt mit beiden genannten Regelgrössen eine adaptive Regelung der Fadenlieferung zur Kompensation der Spannungsschwankungen durch.Since the geometry of the thread laying 11 is known, the difference of the thread tension to a reference value can be calculated for each point of the traversing movement, which takes place in the delivery control 18, which receives the position information of the thread guide 12 from the spindle control 17 for this purpose. The spindle controller 18 calculates a required for the correction of the periodic voltage fluctuations controlled variable and performs with both said control variables an adaptive control of the thread delivery to compensate for the voltage fluctuations.

Wenn beispielsweise die adaptive Regelung so erfolgt, dass an den Umkehrpunkten und in der Spulenmitte die gleiche Fadenspannung herrscht, wird die periodische Störung durch die Fadenverlegung 11 praktisch vollständig kompensiert. Da die maximale Amplitude der periodischen Spannungsschwankungen ein Mehrfaches, etwa das Drei- bis Fünffache, der maximalen Amplitude der stochastischen Spannungsschwankungen beträgt, ist durch die adaptive Regelung der Fadenlieferung der Grossteil der Störungen kompensiert.If, for example, the adaptive control takes place in such a way that the same thread tension prevails at the reversal points and in the center of the coil, the periodic disturbance caused by the thread laying 11 is virtually completely compensated. Since the maximum amplitude of the periodic voltage fluctuations is a multiple, for example three to five times, the maximum amplitude of the stochastic voltage fluctuations, the adaptive control of the yarn delivery compensates for the majority of the disturbances.

Wegen des weit überwiegenden Anteils der periodischen Spannungsschwankungen ist es auch möglich, für bestimmte Anwendungen, beispielsweise für Billigausführungen, auf den Sensor 6 zu verzichten und die Kompensation der Spannungsstörungen lediglich anhand der periodischen Störungen vorzunehmen.Because of the vast majority of the periodic voltage fluctuations, it is also possible for certain applications, such as cheap versions, to dispense with the sensor 6 and make the compensation of the voltage disturbances only on the basis of periodic disturbances.

Claims (11)

  1. Method for controlling the thread tension on a textile machine, in which the thread (F) is drawn from a supply (2) by a thread supply device (5) and fed to a thread laying device (11), a controlled variable for the speed of supply of the thread (F) being obtained, and a distinction being drawn between the disturbances causing the fluctuations in the thread tension due to periodic and stochastic disturbances, and the periodic disturbances being calculated and taken into account in the aforementioned controlled variable, characterized in that, by using the calculated periodic disturbances, adaptive modification of the speed of supply is carried out, in which the speed of supply is increased or reduced as a function of the respective position of the thread guide (12) of the thread laying device (11).
  2. Method according to Claim 1, characterized in that the thread tension is measured and the stochastic disturbances measured in the process are likewise taken into account in the aforementioned controlled variable.
  3. Method according to Claim 1, characterized in that the adaptive modification is carried out in such a way that the thread tension reaches the same value at the reversal points and in the centre of the movement path of the thread guide (12).
  4. Device for controlling the thread tension on a textile machine having a motor-driven supply mechanism (5) for the thread (F) and a thread laying device (11) having a thread guide (12) for winding the thread (F) onto a yarn carrier (9), characterized in that a control system for calculating a controlled variable for correcting a periodic fluctuation of the thread tension and for adaptive control of the supply of the thread in order to compensate for the thread tension fluctuations are provided, the drive (4) of the supply mechanism (5) being controlled in such a way that compensation is provided for the periodic disturbances in the thread tension caused by the thread laying device (11).
  5. Device according to Claim 4, characterized in that a sensor (6) for measuring the thread tension is arranged between supply mechanism (5) and thread laying device (11), and the drive (4) of the supply mechanism (5) is controlled in such a way that, in addition to compensating for the periodic disturbances, compensation is provided for the measured stochastic disturbances in the thread tension measured by the sensor (6).
  6. Device according to Claim 4 or 5, characterized in that the compensation for the periodic disturbances in the thread tension is provided by means of adaptive modification of the drive (4) of the supply mechanism (5) by using a calculation of the thread tension for the various positions of the thread guide (12).
  7. Device according to Claim 6, characterized in that the aforementioned calculation is carried out while also taking the instantaneous thread speed into account.
  8. Device according to Claim 6 or 7, characterized in that the position of the thread guide (12) is determined by a sensor.
  9. Device according to Claim 6 or 7, characterized in that the position of the thread guide (12) is predefined by a control stage.
  10. Device according to one of Claims 6 to 8, characterized in that a first control stage (17) for the drive of the yarn carrier (9) and the thread laying device (11), and a second control stage (18) connected to the latter for the drive (4) of the supply mechanism (5) are provided, and in that the second control stage (18) is fed with data about the instantaneous position of the thread guide (12) and the instantaneous thread tension.
  11. Use of the method according to one of Claims 1 to 3 in winding machines.
EP20020020139 2001-12-05 2002-09-09 Method and device for controlling the yarn tension in a textile machine and use of the method Expired - Lifetime EP1318097B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20020020139 EP1318097B1 (en) 2001-12-05 2002-09-09 Method and device for controlling the yarn tension in a textile machine and use of the method

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01128877 2001-12-05
EP01128877A EP1319622A1 (en) 2001-12-05 2001-12-05 Method and apparatus for controlling the yarn tension in a textile machine and use of the method
EP20020020139 EP1318097B1 (en) 2001-12-05 2002-09-09 Method and device for controlling the yarn tension in a textile machine and use of the method

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EP1318097A1 EP1318097A1 (en) 2003-06-11
EP1318097B1 true EP1318097B1 (en) 2010-02-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3950552A1 (en) 2020-08-07 2022-02-09 TMT Machinery, Inc. Yarn winder

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE345303T1 (en) * 2003-10-04 2006-12-15 Ssm Ag METHOD AND DEVICE FOR CONTROLLING THREAD TENSION ON A TEXTILE MACHINE, AND APPLICATION OF THE METHOD
DE50305699D1 (en) * 2003-10-04 2006-12-28 Ssm Ag Method and device for controlling the thread tension on a winding machine, and application of the method
JP5730557B2 (en) * 2010-12-14 2015-06-10 Ｔｍｔマシナリー株式会社 Yarn winding machine
CN108313826B (en) * 2018-02-28 2024-02-20 浙江理工大学 Active tension-adjustable yarn feeding device and working method thereof
CH717382A1 (en) 2020-05-05 2021-11-15 Ssm Schaerer Schweiter Mettler Ag Method and device for winding a thread onto a bobbin.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4129803A1 (en) * 1991-09-07 1993-03-11 Schlafhorst & Co W THREAD STRENGTH SENSOR FOR A TEXTILE MACHINE
EP0950631B1 (en) * 1998-02-14 2003-08-06 Volkmann GmbH Method and device for winding conical bobbins

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3950552A1 (en) 2020-08-07 2022-02-09 TMT Machinery, Inc. Yarn winder

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