EP1249422B2 - Yarn clearing device in the winding station of a textile machine - Google Patents

Yarn clearing device in the winding station of a textile machine Download PDF

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Publication number
EP1249422B2
EP1249422B2 EP02003948A EP02003948A EP1249422B2 EP 1249422 B2 EP1249422 B2 EP 1249422B2 EP 02003948 A EP02003948 A EP 02003948A EP 02003948 A EP02003948 A EP 02003948A EP 1249422 B2 EP1249422 B2 EP 1249422B2
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EP
European Patent Office
Prior art keywords
yarn
thread
length
clearing device
measuring
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EP02003948A
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German (de)
French (fr)
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EP1249422B1 (en
EP1249422A3 (en
EP1249422A2 (en
Inventor
Andreas Krüger
Gerard Küsters
Christian Sturm
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Oerlikon Textile GmbH and Co KG
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Oerlikon Textile GmbH and Co KG
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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
    • B65H61/00—Applications of devices for metering predetermined lengths of running material
    • B65H61/005—Applications of devices for metering predetermined lengths of running material for measuring speed of running yarns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B65H63/062—Electronic slub detector
    • 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 invention relates to a yarn cleaning device according to the preamble of claim 1.
  • a quality matrix is created in which, for example, the diameter deviation in percent and the error length in millimeters are entered.
  • the desired degree of purification is set and given to the machine or workstation.
  • the measuring values required for determining the error length are obtained by the cleaner, for example by detecting the instantaneous surface speed or the rotational speed of the drive roller, which causes the cross-wound bobbin to rotate by means of friction. Jobs with such a cleaner are for example from the CH 635 300 A5 , from the DE 29 18 740 C2 , from the DE 39 11 505 A1 or the generic DE 196 40 184 A1 known.
  • the CH 669 779 A5 describes the length measurement of the current yarn on spooling machines producing cross-wound bobbins.
  • the length measurement is carried out with the aid of an optical correlator system.
  • winding or rewinding the length of the wound yarn is to be determined as accurately as possible, for example, in the weaving preparation to reduce the rewinding of residual bobbins or waste by remaining on the bobbins yarn residues or completely avoided.
  • the yarn is rewound for example by a spinning cop on the driven by a grooved cheese cross-wound bobbin.
  • Such a grooved drum is also referred to as a drive roller with a sweeping thread.
  • a probe with built-in knife and a control unit are used for electronic yarn cleaning.
  • the length measuring device consists of a further probe, which includes an optical device and a preamplifier and a counting and display unit, which contains all other circuits. From Garnrillian or from a mechanical yarn feeler and the drive means of the cheese, the length measuring receives the information that actually a yarn is wound. This is to avoid that in the Umspulpausen or thread interruptions measured values are detected, leading to erroneous results.
  • the counting unit receives signals from the length measuring device. After reaching the nominal length of the wound on the cross-wound bobbin, a signal is delivered to the yarn cleaner by the counting unit and the thread is severed by the built-in knife. A further exchange of data between the length measuring device and the yarn cleaner does not take place.
  • the winding device is used to produce cheeses, wherein the rotation of the cheese is generated by means of friction action of a drive roller.
  • the signal generator is designed as a pickup picking up pulses from a flywheel connected to the drive roller of the cheese.
  • the density of the pulse train is a measure of the peripheral speed of the drive roller known in its diameter and thus also approximately for the speed of the running yarn.
  • the generic DE 196 40 184 A1 describes the complete cleaning of both long and short yarn defects at the winding units of a winding machine. For this purpose, after the occurrence of a yarn error, the length of the faulty thread between the time of the occurrence of the error and the time of thread trimming is determined. To eliminate the faulty thread piece, a suction tube is positioned in front of the package. The thread end is unwound, the entry of the thread determined by means of a suction tube arranged in the thread end sensor and determined by the winding package unwound and entering the suction pipe thread length.
  • the unwinding process is stopped when, based on the determined thread length such a thread length has been sucked into the suction pipe, that during the subsequent insertion of the package-side yarn in the yarn end connecting device since the occurrence of the yarn defect still wound thread length outside the Thread end connecting device for separating remains.
  • the quality control of the yarn is carried out by the measuring head of a cleaner.
  • the speed of the thread passing through the cleaner during the winding process varies by approximately ⁇ 35 percent, depending on the laying frequency of the thread. According to inaccurate obtained by the prior art by evaluating the drive roller pulses Garnschreibinn for the cleaning of the yarn.
  • a further advantageous embodiment of the invention is the subject of Unteralls.
  • a yarn cleaning device which is set up in such a way that the device for determining the longitudinal extent of a yarn defect has a non-contact measuring head with two measuring points arranged one after the other in the direction of movement of the running yarn and has a time-of-flight correlator for evaluating the chronological sequence of the detected measured values, increases the accuracy of measured error length significantly. In addition to a higher level of measurement reliability, it is also possible to completely or partially dispense with a "safety margin" when determining the purification limits in the quality matrix.
  • Such a supplement consists, for example, in a shortening of the impermissible error length given in each case in order to ensure that despite the occurrence of the measurement inaccuracy, a specific impermissible error is still detected and cut out.
  • a speed lower than the actual speed of the yarn passing through the cleaner cleaning head of the yarn cleaning device is detected from the pulses detected at the drive roller of the prior art, an error length shorter than the actual error length is calculated.
  • actually existing impermissible errors could not be recognized as such and undesirably reduce the yarn quality.
  • a speed is determined which is higher than the actual speed, an impermissible error is concluded on the basis of the measurement results, although such is not present and the number of cleaner cuts or spin interruptions is thus unnecessarily increased.
  • the two yarn sensors connected to the yarn sensors can be used two successively arranged measuring points are used to act non-contact sensors that operate, for example, on an optical or capacitive basis.
  • the yarn sensors detect a stochastic function of the transverse dimension of the running thread, wherein the variations in the transverse dimension may be mass, volume or diameter variations.
  • the measuring head according to the invention is designed so that the yarn sensors detect the transverse dimension of the running thread.
  • the signals representing the transverse dimension of the running thread can be used on the one hand for a highly accurate determination of the yarn speed, and on the other hand advantageously for quality monitoring of the yarn.
  • This also has the advantage that the transverse dimension of the running yarn and the yarn speed can be measured at the same point and thus can not occur due to different measuring locations distortions of the measurement result.
  • a hitherto for the yarn cleaning usual separate cleaner measuring head deleted. The elimination of the cleaner measuring head at each job can be achieved in multi-site textile machines, such as winder or spinning-winding machines, significant savings or cost reductions.
  • a further increase in the measurement reliability is achieved in that the yarn cleaning device is set up such that a third signal is formed as an arithmetic mean from the respective measured values of the two measuring points as a signal for monitoring the transverse dimension of the running thread.
  • a yarn cleaning device can be advantageously achieve an increase in measurement accuracy and reliability, improve the quality of the yarn and cost savings and productivity increases on the textile machine.
  • FIG. 1 is not within the scope of the claims.
  • the thread 1 is withdrawn from a delivery bobbin 2 and passes through a controlled yarn brake 3, a cleaner 4, a cutting device 5 and the measuring head 6 of a device for determining the continuous thread length, before being offset by a provided with Kehrgewinderillen drive roller 7 in a traversing movement and on the cheese is wound up.
  • the drive roller 7 gives the cross-wound bobbin 8 a rotational movement by means of a frictional action.
  • the cross-wound bobbin 8 is carried by a bobbin holder 9, which is pivotally mounted in a hinge 10 in the machine frame 11 partially shown.
  • the thread 1 is subject to continuous quality control.
  • the diameter of the running thread 1 is measured by means of the cleaner measuring head 4.
  • a per se known optical sensor device is used for the diameter or thickness measurement of the thread 1.
  • the measuring head 6 has two in the direction of movement of the running thread 1 successively fixed measuring points, each with a yarn sensor 12, 13.
  • the measured values of the yarn sensors 12, 13 are evaluated via a time-of-flight correlator 14 and the yarn speed is determined. Via an integrator, the thread speed is evaluated for the cumulative run length determination of the thread.
  • An angle sensor 15 outputs signals proportional to the yarn speed.
  • a flywheel 17 is arranged on the shaft 16 of the drive roller 7, the individual poles are registered when passing on the angle sensor 15.
  • the number of pulses is counted and fed via the control device 18 to the delay correlator 14 for setting the range for the correct locking of the control loop.
  • the control device 18 comprises an evaluation and storage module.
  • the controller 18 includes a module for storing the predetermined yarn length and comparing the predetermined yarn length and the cumulated yarn length. If the cumulated yarn length reaches the predetermined value, the control device 18 generates a signal with which the cutting device 5 is activated and the thread 1 is severed. The winding process is terminated, the full cheese 8 removed and started after inserting an empty sleeve, not shown, a new winding process.
  • the length measurement described allows highly accurate adherence to the predetermined length of thread to be wound on the cheese 8.
  • the cleaner measuring head 4 detects an inadmissible undershooting or exceeding the thickness of the thread 1, the length of this yarn fault is detected via the control device 18. If it appears that a yarn fault that is impermissible in accordance with the specified cleaning limits of the quality matrix is present, the cutting device 5 is activated and a cleaner cut is carried out in a known manner. After eliminating the faulty thread section, as for example from the DE 196 14 184 A1 is known, the thread ends are reconnected in a splicer 19 and the winding process then continued.
  • a high-quality quality monitoring of the thread 1 can be achieved.
  • the high measurement reliability allows a significant reduction in the cleaner cuts and thus the yarn quality and an increase in productivity through fewer interruptions of the winding process.
  • FIG. 2 shows a winding unit with an embodiment of the yarn cleaning device according to the invention, which largely the winding unit of FIG. 1 like. In contrast to the winding unit of FIG. 1 however, this winding unit does not have a separate detergent measuring head.
  • the yarn sensor 12 detects the thread thickness.
  • the yarn sensor 12 is part of a known per se and therefore not shown in detail optical measuring path. If an impermissible thickness deviation of the thread 1 is detected, the length of the yarn defect is determined via the link with the control device 18.
  • the execution of a cleaner cut and end and beginning of the winding process are at the winding unit of FIG. 2 analogous to FIG. 1 completed procedure completed.
  • the measured values of the yarn sensor 12 representing the thread thickness of the thread 1 are evaluated on the one hand as a thickness value for quality monitoring and serve in conjunction with the measured values of the yarn sensor 12 for the speed relationship or yarn length measurement.
  • the invention is of course not limited to the embodiment described in the FIG. 2 is shown.
  • the drive, storage and mounting of device parts as well as the control and linking takes place, as far as not further explained, according to the prior art, as is apparent, for example, from the cited documents and the cited prior art there.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Description

Die Erfindung betrifft eine Garnreinigungseinrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a yarn cleaning device according to the preamble of claim 1.

Es ist üblich, an Textilmaschinen, wie zum Beispiel Spulmaschinen oder Spinn-Spulmaschinen, die Qualität des laufenden Fadens durch einen sogenannten Reiniger an jeder Arbeitsstelle zu überwachen, um eine hohe Gleichmäßigkeit beziehungsweise eine hohe Qualität des Garns zu erzielen. Dabei wird mittels eines Garnsensors kontinuierlich eine Querdimension des Fadens, zum Beispiel die Dicke des Fadens, detektiert. Bei Über- oder Unterschreitung vorgegebener Werte der Querdimension des Fadens wird die Länge dieser Toleranzüberschreitung ermittelt. Abhängig von dem Grad der Dickenabweichung und der Länge der Abweichung wird entschieden, ob der Fehler lediglich registriert oder ob der Garnabschnitt mit einem unzulässigen Fehler durch einen Reinigerschnitt oder eine Spinnunterbrechung eliminiert wird.It is common on textile machines, such as winder or spinning-winding machines, to monitor the quality of the running thread by a so-called cleaner at each workstation in order to achieve a high uniformity or a high quality of the yarn. In this case, a transverse dimension of the thread, for example the thickness of the thread, is continuously detected by means of a yarn sensor. If the specified values of the transverse dimension of the thread are exceeded or not reached, the length of this tolerance violation is determined. Depending on the degree of thickness deviation and the length of the deviation, it is decided whether the defect is merely registered or whether the yarn portion is eliminated with an impermissible defect by a cleaner cut or a spinning break.

Für diese Entscheidung wird eine Qualitätsmatrix erstellt, in der beispielsweise die Durchmesserabweichung in Prozent und die Fehlerlänge in Millimeter eingetragen sind. Nach dieser Matrix wird der gewünschte Ausreinigungsgrad eingestellt und der Maschine beziehungsweise der Arbeitsstelle vorgegeben. Die zur Bestimmung der Fehlerlänge erforderlichen Meßwerte erhält der Reiniger zum Beispiel durch Detektion der momentanen Oberflächengeschwindigkeit beziehungsweise der Drehzahl der Antriebswalze, welche mittels Friktion die Kreuzspule in Rotation versetzt. Arbeitsstellen mit einem derartigen Reiniger sind zum Beispiel aus der CH 635 300 A5 , aus der DE 29 18 740 C2 , aus der DE 39 11 505 A1 oder der gattungsbildenden DE 196 40 184 A1 bekannt.For this decision, a quality matrix is created in which, for example, the diameter deviation in percent and the error length in millimeters are entered. After this matrix, the desired degree of purification is set and given to the machine or workstation. The measuring values required for determining the error length are obtained by the cleaner, for example by detecting the instantaneous surface speed or the rotational speed of the drive roller, which causes the cross-wound bobbin to rotate by means of friction. Jobs with such a cleaner are for example from the CH 635 300 A5 , from the DE 29 18 740 C2 , from the DE 39 11 505 A1 or the generic DE 196 40 184 A1 known.

Die CH 669 779 A5 beschreibt die Längenmessung des laufenden Fadens auf Kreuzspulen herstellenden Spulmaschinen. Die Längenmessung erfolgt mit Hilfe eines optischen Korrelatorsystems. Beim Auf- oder Umspulen soll die Länge des aufgespulten Fadens möglichst genau ermittelt werden, um zum Beispiel in der Webereivorbereitung das Umspulen von Restspulen oder Abfall durch auf den Spulen verbleibenden Garnresten zu vermindern oder ganz zu vermeiden. Das Garn wird beispielsweise von einem Spinnkops auf die von einer Nutentrommel angetriebene Kreuzspule umgespult. Eine solche Nutentrommel wird auch als Antriebswalze mit Kehrgewinde bezeichnet. Ein Tastkopf mit eingebautem Messer und ein Steuergerät dienen der elektronischen Garnreinigung. Die Längenmeßeinrichtung besteht aus einem weiteren Tastkopf, welcher eine Optikeinrichtung und einen Vorverstärker enthält sowie aus einer Zähl- und Anzeigeeinheit, welche alle übrigen Schaltungen enthält. Vom Garnreiniger oder auch von einem mechanischen Fadentaster sowie von der Antriebseinrichtung der Kreuzspule erhält die Längenmeßeinrichtung die Information, daß tatsächlich ein Garn gespult wird. Damit soll vermieden werden, daß in den Umspulpausen beziehungsweise bei Fadenunterbrechungen Meßwerte erfaßt werden, die zu fehlerhaften Ergebnissen führen. Die Zähleinheit erhält Signale von der Längenmeßeinrichtung. Nach dem Erreichen der Soll-Länge des auf der Kreuzspule aufgewickelten Fadens wird von der Zähleinheit ein Signal an den Garnreiniger abgegeben und der Faden vom eingebauten Messer durchtrennt. Ein weitergehenderer Datenaustausch zwischen der Längenmeßeinrichtung und dem Garnreiniger findet nicht statt.The CH 669 779 A5 describes the length measurement of the current yarn on spooling machines producing cross-wound bobbins. The length measurement is carried out with the aid of an optical correlator system. When winding or rewinding the length of the wound yarn is to be determined as accurately as possible, for example, in the weaving preparation to reduce the rewinding of residual bobbins or waste by remaining on the bobbins yarn residues or completely avoided. The yarn is rewound for example by a spinning cop on the driven by a grooved cheese cross-wound bobbin. Such a grooved drum is also referred to as a drive roller with a sweeping thread. A probe with built-in knife and a control unit are used for electronic yarn cleaning. The length measuring device consists of a further probe, which includes an optical device and a preamplifier and a counting and display unit, which contains all other circuits. From Garnreiniger or from a mechanical yarn feeler and the drive means of the cheese, the length measuring receives the information that actually a yarn is wound. This is to avoid that in the Umspulpausen or thread interruptions measured values are detected, leading to erroneous results. The counting unit receives signals from the length measuring device. After reaching the nominal length of the wound on the cross-wound bobbin, a signal is delivered to the yarn cleaner by the counting unit and the thread is severed by the built-in knife. A further exchange of data between the length measuring device and the yarn cleaner does not take place.

Eine weitere Vorrichtung zum Messen der Geschwindigkeit von Fäden an einer Wickeleinrichtung zeigt die DE 42 25 842 A1 . Die Wickeleinrichtung dient der Herstellung von Kreuzspulen, wobei die Drehung der Kreuzspule mittels Friktionswirkung von einer Antriebswalze erzeugt wird. Eine Laufzeitkorrelator-Schaltung mit zwei in festem Abstand in Bewegungsrichtung des laufenden Textilfadens hintereinander angeordneten Meßpunkten, an denen berührungslos gemessen wird, und ein weiterer Signalgeber sind miteinander verbunden. Der Signalgeber ist als Impulsaufnehmer ausgebildet, der Impulse von einem mit der Antriebswalze der Kreuzspule verbundenen Polrad aufnimmt. Die Dichte der Impulsfolge ist dabei ein Maß für die Umfangsgeschwindigkeit der in ihrem Durchmesser bekannten Antriebswalze und damit auch annähernd für die Geschwindigkeit des laufenden Fadens. Diese Signale werden dem Laufzeitkorrelator zur Bereichsvorgabe für das Einrasten des Regelkreises auf das richtige Totzeitmaximum (Maximum der Korrelationsfunktion für die Laufzeit des Fadens vom ersten zum zweiten Meßpunkt = Totzeit) zugeleitet. Dadurch kann die hohe Meßgenauigkeit des Laufzeitkorrelators ohne erheblichen Aufwand an Rechenkapazität auch bei sich ändernden Fadengeschwindigkeiten genutzt werden. Die mit Hilfe des Laufzeitkorrelators ermittelte Geschwindigkeit kann über einen Integrator unmittelbar zur kumulativen Lauflängenbestimmung eines Textilfadens ausgewertet werden.Another device for measuring the speed of threads on a winder shows the DE 42 25 842 A1 , The winding device is used to produce cheeses, wherein the rotation of the cheese is generated by means of friction action of a drive roller. A term correlator circuit with two at a fixed distance in the direction of movement of the running textile thread successively arranged measuring points at which contact is measured, and another signal generator are connected to each other. The signal generator is designed as a pickup picking up pulses from a flywheel connected to the drive roller of the cheese. The density of the pulse train is a measure of the peripheral speed of the drive roller known in its diameter and thus also approximately for the speed of the running yarn. These signals are the term correlator for range setting for the engagement of the control loop to the right dead time maximum (maximum of the correlation function for the duration of the thread from the first to the second measuring point = dead time) fed. As a result, the high accuracy of the time of flight correlator can be used without considerable expenditure of computing capacity even with changing thread speeds. The speed determined with the aid of the time-of-flight correlator can be evaluated directly by an integrator for the cumulative run-length determination of a textile thread.

Die gattungsbildende DE 196 40 184 A1 beschreibt die vollständige Ausreinigung sowohl langer als auch kurzer Garnfehler an den Spulstellen einer Spulmaschine. Dazu wird nach Auftreten eines Garnfehlers die Länge des fehlerbehafteten Fadens zwischen dem Zeitpunkt des Auftretens des Fehlers und dem Zeitpunkt des Fadenschnitts ermittelt. Zur Beseitigung des fehlerbehafteten Fadenstücks wird ein Saugrohr vor der Auflaufspule positioniert. Das Fadenende wird abgespult, der Eintritt des Fadens mittels eines in dem Saugrohr angeordneten Fadenendensensors festgestellt und die von der Auflaufspule abgewickelte und in das Saugrohr einlaufende Fadenlänge ermittelt. Der Abwickelvorgang wird gestoppt, wenn auf Basis der ermittelten Fadenlänge eine solche Fadenlänge in das Saugrohr eingesaugt worden ist, daß beim anschließenden Einlegen des auflaufspulenseitigen Fadens in die Fadenendenverbindeeinrichtung die seit Auftreten des Garnfehlers noch aufgespulte Fadenlänge außerhalb der Fadenendenverbindeeinrichtung zum Abtrennen verbleibt. Die Qualitätsüberwachung des Garns erfolgt durch den Meßkopf eines Reinigers.The generic DE 196 40 184 A1 describes the complete cleaning of both long and short yarn defects at the winding units of a winding machine. For this purpose, after the occurrence of a yarn error, the length of the faulty thread between the time of the occurrence of the error and the time of thread trimming is determined. To eliminate the faulty thread piece, a suction tube is positioned in front of the package. The thread end is unwound, the entry of the thread determined by means of a suction tube arranged in the thread end sensor and determined by the winding package unwound and entering the suction pipe thread length. The unwinding process is stopped when, based on the determined thread length such a thread length has been sucked into the suction pipe, that during the subsequent insertion of the package-side yarn in the yarn end connecting device since the occurrence of the yarn defect still wound thread length outside the Thread end connecting device for separating remains. The quality control of the yarn is carried out by the measuring head of a cleaner.

Die Geschwindigkeit des den Reiniger beim Spulvorgang durchlaufenden Fadens variiert beispielsweise abhängig von der Verlegefrequenz des Fadens um circa ± 35 Prozent. Entsprechend ungenau sind die nach dem Stand der Technik durch Auswertung der Antriebswalzenimpulse gewonnenen Garnfehlerlängen für die Ausreinigung des Garns.For example, the speed of the thread passing through the cleaner during the winding process varies by approximately ± 35 percent, depending on the laying frequency of the thread. According to inaccurate obtained by the prior art by evaluating the drive roller pulses Garnfehlerlängen for the cleaning of the yarn.

Es ist Aufgabe der Erfindung, die bekannten Garnreinigungseinrichtungen an Spulstellen von Textilmaschinen zu verbessern.It is an object of the invention to improve the known yarn cleaning devices on winding units of textile machines.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Eine Weitere vorteilhafte Ausgestaltung der Erfindung ist Gegenstand des Unteransprüches.A further advantageous embodiment of the invention is the subject of Unteransprüches.

Eine erfindungsgemäße Garnreinigungseinrichtung, die so eingerichtet ist, daß die Einrichtung zum Bestimmen der Längsausdehnung eines Garnfehlers einen berührungslos arbeitenden Meßkopf mit zwei in Bewegungsrichtung des laufenden Fadens hintereinander angeordneten Meßpunkten aufweist sowie einen Laufzeitkorrelator zur Auswertung der zeitlichen Abfolge der detektierten Meßwerte besitzt, erhöht die Genauigkeit der gemessenen Fehlerlänge signifikant. Neben einer höheren Meßsicherheit kann auch auf einen "Sicherheitszuschlag" bei der Festlegung der Ausreinigungsgrenzen in der Qualitätsmatrix ganz oder teilweise verzichtet werden. Ein derartiger Zuschlag besteht zum Beispiel in einer Verkürzung der als jeweils unzulässig vorgegebenen Fehlerlänge, um sicherzustellen, daß trotz Auftreten der Meßungenauigkeit ein bestimmter unzulässiger Fehler noch detektiert und herausgeschnitten wird. Wird aus den an der Antriebswalze nach dem Stand der Technik detektierten Impulsen eine Geschwindigkeit ermittelt, die niedriger ist als die tatsächliche Geschwindigkeit des durch den Reinigermeßkopf der Garnreinigungseinrichtung laufenden Fadens, wird eine Fehlerlänge berechnet, die kürzer ist als die tatsächliche Fehlerlänge. Dadurch könnten tatsächlich vorhandene unzulässige Fehler nicht als solche erkannt werden und die Garnqualität unerwünscht mindern. Wird dagegen eine Geschwindigkeit ermittelt, die höher ist als die tatsächliche Geschwindigkeit, wird aufgrund der Meßergebnisse auf einen unzulässigen Fehler geschlossen, obwohl ein solcher nicht vorliegt und die Zahl der Reinigerschnitte oder der Spinnunterbrechungen somit unnötig erhöht.A yarn cleaning device according to the invention, which is set up in such a way that the device for determining the longitudinal extent of a yarn defect has a non-contact measuring head with two measuring points arranged one after the other in the direction of movement of the running yarn and has a time-of-flight correlator for evaluating the chronological sequence of the detected measured values, increases the accuracy of measured error length significantly. In addition to a higher level of measurement reliability, it is also possible to completely or partially dispense with a "safety margin" when determining the purification limits in the quality matrix. Such a supplement consists, for example, in a shortening of the impermissible error length given in each case in order to ensure that despite the occurrence of the measurement inaccuracy, a specific impermissible error is still detected and cut out. When a speed lower than the actual speed of the yarn passing through the cleaner cleaning head of the yarn cleaning device is detected from the pulses detected at the drive roller of the prior art, an error length shorter than the actual error length is calculated. As a result, actually existing impermissible errors could not be recognized as such and undesirably reduce the yarn quality. On the other hand, if a speed is determined which is higher than the actual speed, an impermissible error is concluded on the basis of the measurement results, although such is not present and the number of cleaner cuts or spin interruptions is thus unnecessarily increased.

Da mit einer erfindungsgemäßen Garnreinigungseinrichtung der Sicherheitszuschlag weitgehend oder ganz vernachlässigt werden kann, sinkt die Zahl der als unzulässig angezeigten Garnfehler deutlich und damit auch die Zahl der Reinigungsschnitte oder der Spinnunterbrechungen. Dies führt zu einer verbesserten Garnqualität und einer Steigerung der Produktivität der Arbeitsstelle oder der Textilmaschine.Since the security surcharge can be largely or completely neglected with a yarn cleaning device according to the invention, the number of yarn faults displayed as being inadmissible drops significantly, and thus also the number of cleaning cuts or spinning interruptions. This leads to an improved yarn quality and an increase in the productivity of the job or the textile machine.

Bei einer Einrichtung zum Bestimmen der Längsausdehnung eines Garnfehlers, die einen berührungslos arbeitenden Meßkopf mit zwei in Bewegungsrichtung des laufenden Fadens hintereinander angeordneten Meßpunkten aufweist sowie einen Laufzeitkorrelator zur Auswertung der zeitlichen Abfolge der detektierten Meßwerte besitzt, kann es sich bei den zwei Garnsensoren, die an den beiden hintereinander angeordneten Meßpunkten eingesetzt sind, um berührungslos arbeitende Sensoren handeln, die zum Beispiel auf optischer oder kapazitiver Basis arbeiten. Die Garnsensoren erfassen eine stochastische Funktion der Querdimension des laufenden Fadens, wobei die Schwankungen der Querdimension Masse-, Volumen- oder Durchmesserschwankungen sein können. Der Meßkopf ist erfindungsgemäß so ausgebildet, daß die Garnsensoren die Querdimension des laufenden Fadens detektieren. Die die Querdimension des laufenden Fadens repräsentierenden Signale können einerseits für eine hochgenaue Bestimmung der Garngeschwindigkeit, und andererseits vorteilhaft für eine Qualitätsüberwachung des Garns genutzt werden. Dies hat zudem den Vorteil, daß die Querdimension des laufenden Fadens und die Garngeschwindigkeit an derselben Stelle gemessen werden und somit keine durch unterschiedliche Meßorte hervorgerufene Verfälschungen des Meßergebnisses auftreten können. Ein bisher für die Garnreinigung üblicher gesonderter Reinigermeßkopf entfällt. Durch den Wegfall des Reinigermeßkopfes an jeder Arbeitsstelle lassen sich bei Vielstellen-Textilmaschinen, wie Spulmaschinen oder Spinn-Spulmaschinen, erhebliche Einsparungen beziehungsweise Kostensenkungen erzielen.In a device for determining the longitudinal extent of a yarn defect, which has a non-contact measuring head with two measuring points arranged one after the other in the direction of movement of the running yarn and has a time-of-flight correlator for evaluating the time sequence of the detected measured values, the two yarn sensors connected to the yarn sensors can be used two successively arranged measuring points are used to act non-contact sensors that operate, for example, on an optical or capacitive basis. The yarn sensors detect a stochastic function of the transverse dimension of the running thread, wherein the variations in the transverse dimension may be mass, volume or diameter variations. The measuring head according to the invention is designed so that the yarn sensors detect the transverse dimension of the running thread. The signals representing the transverse dimension of the running thread can be used on the one hand for a highly accurate determination of the yarn speed, and on the other hand advantageously for quality monitoring of the yarn. This also has the advantage that the transverse dimension of the running yarn and the yarn speed can be measured at the same point and thus can not occur due to different measuring locations distortions of the measurement result. A hitherto for the yarn cleaning usual separate cleaner measuring head deleted. The elimination of the cleaner measuring head at each job can be achieved in multi-site textile machines, such as winder or spinning-winding machines, significant savings or cost reductions.

Vorzugsweise wird eine weitere Steigerung der Meßsicherheit dadurch erreicht, daß die Garnreinigungseinrichtung so eingerichtet ist, daß als Signal zur Überwachung der Querdimension des laufenden Fadens jeweils ein drittes Signal als arithmetischer Mittelwert aus den jeweiligen Meßwerten der beiden Meßpunkte gebildet ist.Preferably, a further increase in the measurement reliability is achieved in that the yarn cleaning device is set up such that a third signal is formed as an arithmetic mean from the respective measured values of the two measuring points as a signal for monitoring the transverse dimension of the running thread.

Mit einer erfindungsgemäßen Garnreinigungseinrichtung lassen sich in vorteilhafter Weise eine Steigerung der Meßgenauigkeit und der Meßsicherheit, eine Qualitätsverbesserung des Garns sowie Kosteneinsparungen und Produktivitätssteigerungen an der Textilmaschine erzielen.With a yarn cleaning device according to the invention can be advantageously achieve an increase in measurement accuracy and reliability, improve the quality of the yarn and cost savings and productivity increases on the textile machine.

Anhand des in Figur 2 dargestellten Ausführungsbeispieles wird die Erfindung weiter erläutert. Figur 1 fällt nicht unter den Schutzumfang der Ansprüche.Based on the in FIG. 2 illustrated embodiment, the invention will be further explained. FIG. 1 is not within the scope of the claims.

Es zeigen:

Fig. 1
eine Spulstelle einer Spulmaschine in vereinfachter Darstellung mit dem Meßkopf einer Längenmeßeinrichtung und einem Reinigermeßkopf im Fadenlauf,
Fig. 2
eine Spulstelle einer Spulmaschine in vereinfachter Darstellung mit dem Meßkopf einer Längenmeßeinrichtung.
Show it:
Fig. 1
a winding unit of a winding machine in a simplified representation with the measuring head of a length measuring device and a cleaner measuring head in the yarn path,
Fig. 2
a winding unit of a winding machine in a simplified representation with the measuring head of a length measuring device.

An der Spulstelle der Figur 1 wird der Faden 1 von einer Ablaufspule 2 abgezogen und durchläuft eine geregelte Fadenbremse 3, einen Reiniger 4, eine Schneideinrichtung 5 und den Meßkopf 6 einer Einrichtung zum Bestimmen der durchlaufenden Fadenlänge, bevor er durch eine mit Kehrgewinderillen versehene Antriebswalze 7 in eine Changierbewegung versetzt und auf die Kreuzspule aufgewickelt wird. Die Antriebswalze 7 erteilt der Kreuzspule 8 mittels Friktionswirkung eine Rotationsbewegung. Die Kreuzspule 8 wird von einem Spulenhalter 9 getragen, der in einem Drehgelenk 10 im teilweise dargestellten Maschinengestell 11 schwenkbar gelagert ist.At the winding unit of the FIG. 1 the thread 1 is withdrawn from a delivery bobbin 2 and passes through a controlled yarn brake 3, a cleaner 4, a cutting device 5 and the measuring head 6 of a device for determining the continuous thread length, before being offset by a provided with Kehrgewinderillen drive roller 7 in a traversing movement and on the cheese is wound up. The drive roller 7 gives the cross-wound bobbin 8 a rotational movement by means of a frictional action. The cross-wound bobbin 8 is carried by a bobbin holder 9, which is pivotally mounted in a hinge 10 in the machine frame 11 partially shown.

Der Faden 1 unterliegt einer kontinuierlichen Qualitätsüberwachung. Dazu wird mittels des Reinigermeßkopfes 4 der.Durchmesser des laufenden Fadens 1 gemessen. Für die Durchmesser- beziehungsweise Dickenmessung des Fadens 1 wird eine an sich bekannte optische Sensoreinrichtung eingesetzt.The thread 1 is subject to continuous quality control. For this purpose, the diameter of the running thread 1 is measured by means of the cleaner measuring head 4. For the diameter or thickness measurement of the thread 1, a per se known optical sensor device is used.

Mit Hilfe des berührungslos arbeitenden Meßkopfes 6 wird die Länge des zur Kreuzspule 8 durchlaufenden Fadens 1 bestimmt. Der Meßkopf 6 weist zwei in Bewegungsrichtung des laufenden Fadens 1 hintereinander fest angeordnete Meßpunkte mit jeweils einem Garnsensor 12, 13 auf. Die Meßwerte der Garnsensoren 12, 13 werden über einen Laufzeitkorrelator 14 ausgewertet und die Fadengeschwindigkeit ermittelt. Über einen Integrator wird die Fadengeschwindigkeit zur kumulativen Lauflängenbestimmung des Fadens ausgewertet.With the help of the non-contact measuring head 6, the length of the yarn passing through to the cheese 8 8 is determined. The measuring head 6 has two in the direction of movement of the running thread 1 successively fixed measuring points, each with a yarn sensor 12, 13. The measured values of the yarn sensors 12, 13 are evaluated via a time-of-flight correlator 14 and the yarn speed is determined. Via an integrator, the thread speed is evaluated for the cumulative run length determination of the thread.

Ein Winkelsensor 15 gibt Signale proportional der Fadengeschwindigkeit ab. Zum Erzeugen der Impulse ist auf der Welle 16 der Antriebswalze 7 ein Polrad 17 angeordnet, dessen einzelne Pole beim Vorbeiwandern am Winkelsensor 15 registriert werden. Die Anzahl der Impulse wird gezählt und über die Steuereinrichtung 18 dem Laufzeitkorrelator 14 zur Bereichsvorgabe für das richtige Einrasten des Regelkreises zugeleitet. Die Steuereinrichtung 18 umfaßt ein Auswerte- und Speichermodul.An angle sensor 15 outputs signals proportional to the yarn speed. To generate the pulses, a flywheel 17 is arranged on the shaft 16 of the drive roller 7, the individual poles are registered when passing on the angle sensor 15. The number of pulses is counted and fed via the control device 18 to the delay correlator 14 for setting the range for the correct locking of the control loop. The control device 18 comprises an evaluation and storage module.

Weitere Einzelheiten zu einer Längenmessung mit Laufzeitkorrelator, wie sie auch in der in Fig. 1 dargestellten Spulstelle eingesetzt ist, können der DE 42 25 842 A1 entnommen werden.Further details on a length measurement with a time-of-flight correlator, as described in the Fig. 1 used winding unit is used, the DE 42 25 842 A1 be removed.

Die Steuereinrichtung 18 weist ein Modul auf, um die vorgegebene Garnlänge zu speichern und die vorgegebene Garnlänge und die kumulierte Garnlänge miteinander zu vergleichen. Erreicht die kumulierte Garnlänge den vorgegebenen Wert, generiert die Steuereinrichtung 18 ein Signal, mit dem die Schneideinrichtung 5 aktiviert und der Faden 1 durchtrennt wird. Der Wickelvorgang wird beendet, die volle Kreuzspule 8 abtransportiert und nach Einlegen einer nicht dargestellten leeren Hülse ein neuer Wickelvorgang gestartet.The controller 18 includes a module for storing the predetermined yarn length and comparing the predetermined yarn length and the cumulated yarn length. If the cumulated yarn length reaches the predetermined value, the control device 18 generates a signal with which the cutting device 5 is activated and the thread 1 is severed. The winding process is terminated, the full cheese 8 removed and started after inserting an empty sleeve, not shown, a new winding process.

Die beschriebene Längenmessung erlaubt hochgenaues Einhalten der vorgegebenen Fadenlänge, die auf der Kreuzspule 8 aufgewickelt sein soll.The length measurement described allows highly accurate adherence to the predetermined length of thread to be wound on the cheese 8.

Erfaßt der Reinigermeßkopf 4 eine unzulässige Unter- oder Überschreitung der Dicke des Fadens 1, wird die Länge dieses Garnfehlers über die Steuereinrichtung 18 detektiert. Zeigt sich, daß ein gemäß der vorgegebenen Reinigungsgrenzen der Qualitätsmatrix unzulässiger Garnfehler vorliegt, wird die Schneideinrichtung 5 aktiviert und ein Reinigerschnitt in bekannter Weise durchgeführt. Nach dem Eliminieren des fehlerbehafteten Fadenabschnittes, wie es beispielsweise aus der DE 196 14 184 A1 bekannt ist, werden die Fadenenden in einer Spleißeinrichtung 19 wieder verbunden und der Spulvorgang anschließend fortgesetzt.If the cleaner measuring head 4 detects an inadmissible undershooting or exceeding the thickness of the thread 1, the length of this yarn fault is detected via the control device 18. If it appears that a yarn fault that is impermissible in accordance with the specified cleaning limits of the quality matrix is present, the cutting device 5 is activated and a cleaner cut is carried out in a known manner. After eliminating the faulty thread section, as for example from the DE 196 14 184 A1 is known, the thread ends are reconnected in a splicer 19 and the winding process then continued.

In Verbindung mit der hochgenauen Längenmessung ist eine qualitativ hochwertige Qualitätsüberwachung des Fadens 1 erreichbar. Die hohe Meßsicherheit ermöglicht eine deutliche Verminderung der Reinigerschnitte und damit der Garnqualität sowie eine Steigerung der Produktivität durch weniger Unterbrechungen des Spulvorgangs.In conjunction with the high-precision length measurement, a high-quality quality monitoring of the thread 1 can be achieved. The high measurement reliability allows a significant reduction in the cleaner cuts and thus the yarn quality and an increase in productivity through fewer interruptions of the winding process.

Figur 2 zeigt eine Spulstelle mit einer Ausbildung der erfindungsgemäßen Garnreinigungseinrichtung, die weitgehend der Spulstelle der Figur 1 gleicht. Im Unterschied zur Spulstelle der Figur 1 weist diese Spulstelle jedoch keinen separaten Reinigermeßkopf auf. Der Garnsensor 12 detektiert die Fadendicke. Der Garnsensor 12 ist dabei Teil einer an sich bekannten und daher nicht im einzelnen dargestellten optischen Meßstrecke. Wird eine unzulässige Dickenabweichung des Fadens 1 detektiert, wird über die Verknüpfung mit der Steuereinrichtung 18 die Länge des Garnfehlers bestimmt. Die Durchführung eines Reinigerschnittes sowie Ende und Beginn des Spulvorganges werden an der Spulstelle der Figur 2 analog dem bei Figur 1 vorbeschriebenen Ablauf vollzogen. FIG. 2 shows a winding unit with an embodiment of the yarn cleaning device according to the invention, which largely the winding unit of FIG. 1 like. In contrast to the winding unit of FIG. 1 however, this winding unit does not have a separate detergent measuring head. The yarn sensor 12 detects the thread thickness. The yarn sensor 12 is part of a known per se and therefore not shown in detail optical measuring path. If an impermissible thickness deviation of the thread 1 is detected, the length of the yarn defect is determined via the link with the control device 18. The execution of a cleaner cut and end and beginning of the winding process are at the winding unit of FIG. 2 analogous to FIG. 1 completed procedure completed.

Die die Fadendicke des Fadens 1 repräsentierenden Meßwerte des Garnsensors 12 werden einerseits als Dickenwert für die Qualitätsüberwachung ausgewertet und dienen in Verknüpfung mit den Meßwerten des Garnsensors 12 der Geschwindigkeitsbeziehungsweise Fadenlängenmessung.The measured values of the yarn sensor 12 representing the thread thickness of the thread 1 are evaluated on the one hand as a thickness value for quality monitoring and serve in conjunction with the measured values of the yarn sensor 12 for the speed relationship or yarn length measurement.

In einer alternativen Ausgestaltung der Erfindung werden an einer Spulstelle, entsprechend der Figur 2, die Meßwerte zur Detektion der Fadendicke sowohl des Garnsensors 12 wie auch des Garnsensors 13, der wie der Garnsensor 12 ausgebildet ist, der Steuereinrichtung 18 zugeleitet und in der Steuereinrichtung 18 aus den jeweils von der gleichen Stelle des Fadens gewonnenen Meßwerten jeweils ein drittes Signal als arithmetischer Mittelwert der beiden Meßwerte gebildet. Mit diesem die Fadendicke repräsentierenden Signal wird die Meßsicherheit erhöht.In an alternative embodiment of the invention are at a winding station, according to the FIG. 2 , the measured values for detecting the thread thickness of both the yarn sensor 12 and the yarn sensor 13, which is like the yarn sensor 12, fed to the control device 18 and in the control device 18 from each of the same point of the thread measured values obtained in each case a third signal Arithmetic mean of the two measured values formed. With this signal representing the thread thickness, the measurement reliability is increased.

Die Erfindung ist selbstverständlich nicht auf die Ausführung beschränkt, die in der Figur 2 dargestellt ist. Der Antrieb, die Lagerung und die Halterung von Vorrichtungsteilen sowie die Steuerung und Verknüpfung erfolgt, soweit hier nicht näher erläutert, entsprechend dem Stand der Technik, wie er zum Beispiel aus den zitierten Druckschriften und dem dort angeführten bekannten Stand der Technik hervorgeht.The invention is of course not limited to the embodiment described in the FIG. 2 is shown. The drive, storage and mounting of device parts as well as the control and linking takes place, as far as not further explained, according to the prior art, as is apparent, for example, from the cited documents and the cited prior art there.

Claims (2)

  1. Yam clearing device in the winding station of a textile machine, which comprises a device for determining the length of a fault in the yam,
    characterised in that,
    the device for determining the length of a fault in the yarn comprises a non-contacting measuring head (6) with two measuring points arranged behind one another in the direction of movement of the running thread (1) as well as a running time correlation unit (14) that determines the time lag between the detected measurement values and
    in that the yarn clearing device is set up so that it uses the measurement values detected by the measuring head (6) for continuously monitoring the transverse dimension to check the quality of the thread (1).
  2. Yarn clearing device according to claim 1, characterised in that the yarn clearing device is set up so that as the signal for monitoring the transverse dimension of the thread (1) a third signal is formed as the arithmetic mean of the respective measurement values of the two measuring points.
EP02003948A 2001-04-14 2002-02-22 Yarn clearing device in the winding station of a textile machine Expired - Lifetime EP1249422B2 (en)

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DE10118660A DE10118660A1 (en) 2001-04-14 2001-04-14 Yarn cleaning device at the winding unit of a textile machine
DE10118660 2001-04-14

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DE10118660A1 (en) 2002-10-17
EP1249422B1 (en) 2005-05-04
JP2002348043A (en) 2002-12-04
EP1249422A3 (en) 2003-01-02
DE50202968D1 (en) 2005-06-09
EP1249422A2 (en) 2002-10-16

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