EP1270780A2 - Device for detecting leno yarn breakages on weaving looms and loom, particularly with heald frames and a device for detecting yarn breakages - Google Patents

Device for detecting leno yarn breakages on weaving looms and loom, particularly with heald frames and a device for detecting yarn breakages Download PDF

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Publication number
EP1270780A2
EP1270780A2 EP02011125A EP02011125A EP1270780A2 EP 1270780 A2 EP1270780 A2 EP 1270780A2 EP 02011125 A EP02011125 A EP 02011125A EP 02011125 A EP02011125 A EP 02011125A EP 1270780 A2 EP1270780 A2 EP 1270780A2
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EP
European Patent Office
Prior art keywords
leno
arms
determining
loom
thread
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Granted
Application number
EP02011125A
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German (de)
French (fr)
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EP1270780B1 (en
EP1270780A3 (en
Inventor
Hockemeyer Kurt
Schwemmlein Christoph
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Gebrueder Kloecker GmbH
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Kloecker Entwicklungs GmbH
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Priority claimed from DE10133800A external-priority patent/DE10133800C1/en
Application filed by Kloecker Entwicklungs GmbH filed Critical Kloecker Entwicklungs GmbH
Priority to SI200230515T priority Critical patent/SI1270780T1/en
Publication of EP1270780A2 publication Critical patent/EP1270780A2/en
Publication of EP1270780A3 publication Critical patent/EP1270780A3/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C7/00—Leno or similar shedding mechanisms
    • D03C7/08—Devices for twisting warp threads repeatedly in the same direction
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C7/00—Leno or similar shedding mechanisms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/20—Warp stop motions

Definitions

  • the present invention relates to a device for determining Thread breaks in leno threads in the area of leno selvedges Weaving machines, with the leno selvedge at least two arms Has leadership of at least two leno threads, whereby by rotation the arms are twisted together.
  • the invention also relates to a weaving machine with heald frames and at least one leno selector device that is reversible in its direction of rotation and a device for determining thread breaks on the Leno threads.
  • a fabric has a so-called on the two side edges "Dreherkante" on.
  • Such a leno edge prevents that Tissue dissolves.
  • the various devices become known; for example, is off EP 0 674 031 discloses a rotary edge lathe for weaving machines, which is a so-called rotating disc with opposing eyelets for guiding the leno threads.
  • a so-called "full-turn edge” can be produced, what this is accomplished that the two leno threads around the weft twisted around with each other.
  • Eliminating the twist of the leno threads is a reversal of the direction of rotation a certain number of revolutions is required.
  • DE 196 47 495 C1 describes a device for forming a full-turn edge known, which is driven by a Rotational body with arms diagonally opposite each other distinguished, the arms at the ends of eyelets for carrying out the leno threads exhibit. This device also requires that Untwist the leno threads on the feed side after one A certain number of revolutions reverses the direction of rotation.
  • warp thread monitors Such warp guard are in the back compartment between the leno selvedge and the coil bearing arranged.
  • warp thread monitors are metallic, electrical conductive fins that hang on the leno threads.
  • the invention is therefore based on the object of a device to provide the type mentioned at the beginning, with which it is possible Thread breaks, even with arms reversible in their direction of rotation provided rotating edge devices to be reliably detected, with such Dreherkantenapparaten, on the side of the supply of leno threads cause a twist by reversing the direction of rotation again must be canceled.
  • the device for determining yarn breaks has a device for determining the natural vibrations of the arms.
  • the following consideration is assumed:
  • the arms of the leno selvedge apparatus are under tension by the leno threads guided in the ends of the arms. During rotation, the arms perform a substantially uniform rotation. The vibration behavior of the arms is damped when the rotary movement is stopped, the damping being brought about by the tensioned guidance of the leno threads in the eyelets of the arms.
  • the arm through the eyelet of which the leno thread is no longer guided, is without load and therefore without damping.
  • this arm is set into an oscillation which differs considerably from the oscillation or the course of the oscillation which the arm exerts under the load of the leno thread when stopping.
  • the natural vibration behavior of the arms or the resulting vibration profile thus allows a direct statement to be made about the condition of the leno threads.
  • the device for determining the Vibration behavior of the arms is not in contact with the arms, therefore works without contact, so that the mass of the arms remains unchanged remains.
  • the mass of the arms is to be kept low, otherwise the required high acceleration values from the leno selvedge cannot be realized.
  • the device for determining the Vibration behavior of the arms in the area of the arms of a magnetic field a sensor unit for determining Changes in the magnetic field due to the movement of the magnetic conductive arms of the leno selvedge apparatus is provided, and wherein one Evaluation unit is provided, with the evaluation unit Vibration spectra of the natural vibrations generated by the arms if the thread is broken or intact, the Evaluation unit is arranged downstream of a signal output unit.
  • the Rotation of the magnetically conductive arms finds a change in the Magnetic field instead, the measure of the change in the magnetic field that Reflecting the vibration behavior of the arms.
  • the sensor unit itself can be inductive or capacitive-working means to determine the vibration of the arms of the leno selvedge exhibit.
  • Capacitive means for determining vibrations or the Vibration curve are a capacitor, with the corresponding Movement of the arms in a certain frequency Voltage change in the capacitor takes place.
  • the invention also relates to a weaving machine by a device with one or more features of the above described device for determining thread breaks, wherein here the device for determining thread breaks advantageously in the front compartment is arranged between the leno selvedge and heald frames.
  • the invention also relates to a weaving machine, in particular with heald frames and at least one in its direction of rotation reversible leno selvedge apparatus and a device for determining Thread breaks on the leno threads.
  • a weaving machine in particular with heald frames and at least one in its direction of rotation reversible leno selvedge apparatus and a device for determining Thread breaks on the leno threads.
  • the leno threads with regard to a thread break in Monitor area of the back compartment.
  • This is different Difficulties connected, in particular it should be emphasized that with very strongly adhering threads, such as. B. cotton threads, themselves in the event of a broken thread in the area of the rear thread, that slats designed as warp thread monitors actually fall down and to the desired shutdown of the drive of the weaving machine to lead.
  • the invention is therefore based on the object in a weaving machine of the type mentioned with a reversible in its direction of rotation Dreherkantenapparat a device for determining thread breaks Arrange leno threads in such a way that by twisting the thread in the Back pocket of the operation of the device for determining thread breaks of Leno threads are not hindered.
  • the object is achieved in that the device to determine thread breaks in the front compartment, in particular between Heald frames and leno selvedge is arranged. Find in the front compartment an unwanted twisting of the threads in front of the heald frames Weft does not take place. As a result, there is a possibility of Arrangement of the device for determining thread breaks without their function in any way by twisting the leno threads, as is the case in the back compartment, is negatively influenced.
  • the device for determining Thread breaks are not connected to the leno threads, d. H. as non-contact device is formed.
  • non-contact sensors such as. B. light barriers, Scanner u.
  • Such a sensor unit for determining thread breaks stands advantageously with an evaluation unit and / or directly one Signal output unit in connection, whereby by the signal output unit the drive of the weaving machine can be controlled, d. H. in case of doubt is to be stopped.
  • the bobbin holder designated overall by 1, can be seen from FIG. 1, from which the two leno threads 2 and 3 are subtracted.
  • the two Leno threads 2 and 3 are held down by the thread retainer 4 Tension held and redirected.
  • the leno device designated 10 the two leno threads 2, 3 on the back, d. H. fed in the area of the rear compartment H.
  • the leno selvedge 10 downstream are the heald frames 20 as well as the reed 21 and the tree 22, that picks up the tissue.
  • the front compartment V now extends from that Point of twisting of the leno threads with the weft thread up to Leno device.
  • the leno selvedge 10 shows the motor Drive 11 and the two diagonally opposite arms 12, which form a "propeller".
  • the arms 12 have ends Eyelets 12a for passing the leno threads 2, 3.
  • On the housing of the Motors 11 are provided at least two magnets 13 and behind them each have a sensor unit 14, for example in the form of a coil, one Hall sensor or a capacitor. It is advantageous if both the Magnet, as well as the sensor and the arms 12 of the leno selvedge 10 are arranged one behind the other at a standstill.
  • the sensor unit 14 for example a coil or a Hall sensor as inductive sensors or a capacitor the change of the magnetic field as a frequency spectrum is determined and in an evaluation unit 14a the damping or Vibration curve that is caused by the damping and / or that Vibration spectrum for broken with that with intact leno thread is compared, then depending on the result of the Compare a signal to stop from the signal output unit 14b the drive of the weaving machine takes place.

Abstract

The system to register a leno yarn beak at a loom leno selvage unit has at least two guide arms for at least two leno yarns (2,3), which are twisted together by the rotation of the arms. A monitor (13,14) registers the natural oscillation of the two arms (12). The yarn break monitor is located at the front shed of the loom, between the leno selvage unit (10) and the loom shafts. The oscillation is monitored without contact, using a magnetic field from the magnetically conductive arms and a field sensor. The sensor readings are processed by an evaluation unit, which compares signals for intact and broken yarns, and is connected to a signal transmitter. The arms are fitted with permanent magnets, and the sensor has an inductive action through a coil or a Hall sensor, or it has a capacitative operation.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Ermittlung von Fadenbrüchen von Dreherfäden im Bereich von Dreherkantenapparaten bei Webmaschinen, wobei der Dreherkantenapparat mindestens zwei Arme zur Führung von mindestens zwei Dreherfäden aufweist, wobei durch Rotation der Arme die Fäden miteinander verdrehbar sind. The present invention relates to a device for determining Thread breaks in leno threads in the area of leno selvedges Weaving machines, with the leno selvedge at least two arms Has leadership of at least two leno threads, whereby by rotation the arms are twisted together.

Gegenstand der Erfindung ist ebenfalls eine Webmaschine mit Webschäften sowie mindestens einen in seiner Drehrichtung umkehrbaren Dreherkantenapparat und einer Einrichtung zur Ermittlung von Fadenbrüchen an den Dreherfäden.The invention also relates to a weaving machine with heald frames and at least one leno selector device that is reversible in its direction of rotation and a device for determining thread breaks on the Leno threads.

Eine Gewebe weist an den beiden Seitenkanten eine sogenannte "Dreherkante" auf. Eine solche Dreherkante verhindert, dass sich das Gewebe auflöst. Zur Herstellung einer solchen Dreherkante sind die verschiedensten Apparaturen bekannt geworden; so ist beispielsweise aus der EP 0 674 031 ein Rotationskantendreher für Webmaschinen bekannt, der eine sogenannte Dreherscheibe mit einander gegenüberliegenden Ösen zur Führung der Dreherfäden aufweist. Mit Hilfe dieser bekannten Vorrichtung ist eine sogenannte "Volldreherkante" herstellbar, was dadurch bewerkstelligt wird, dass die beiden Dreherfäden um den Schussfaden herum miteinander verdrillt werden. Um auf der Seite der Zuführung die Verdrillung der Dreherfäden aufzuheben, ist eine Drehrichtungsumkehr nach einer bestimmten Anzahl von Umdrehungen erforderlich.A fabric has a so-called on the two side edges "Dreherkante" on. Such a leno edge prevents that Tissue dissolves. To produce such a leno edge are the various devices become known; for example, is off EP 0 674 031 discloses a rotary edge lathe for weaving machines, which is a so-called rotating disc with opposing eyelets for guiding the leno threads. With the help of this known Device is a so-called "full-turn edge" can be produced, what this is accomplished that the two leno threads around the weft twisted around with each other. To on the side of the feeder Eliminating the twist of the leno threads is a reversal of the direction of rotation a certain number of revolutions is required.

Des Weiteren ist aus der DE 196 47 495 C1 eine Vorrichtung zum Bilden einer Volldreherkante bekannt, die sich durch einen angetriebenen Rotationskörper mit einander diagonal gegenüberliegenden Armen auszeichnet, wobei die Arme endseitig Ösen zur Durchführung der Dreherfäden aufweisen. Auch bei dieser Vorrichtung ist es erforderlich, dass zur Entdrillung der Dreherfäden auf der Seite der Zuführung nach einer bestimmten Anzahl von Umdrehungen eine Drehrichtungsumkehr erfolgt.Furthermore, DE 196 47 495 C1 describes a device for forming a full-turn edge known, which is driven by a Rotational body with arms diagonally opposite each other distinguished, the arms at the ends of eyelets for carrying out the leno threads exhibit. This device also requires that Untwist the leno threads on the feed side after one A certain number of revolutions reverses the direction of rotation.

Bekannt ist zur Überwachung der Dreherfäden im Hinblick auf einen Bruch sogenannte "Kettfadenwächter" einzusetzen. Solche Kettfadenwächter werden im Hinterfach zwischen Dreherkantenapparat und Spulenlagerung angeordnet. Diese Kettfadenwächter stellen sich als metallische, elektrisch leitfähige Lamellen dar, die an den Dreherfäden hängen. It is known to monitor the leno threads for breakage use so-called "warp thread monitors". Such warp guard are in the back compartment between the leno selvedge and the coil bearing arranged. These warp thread monitors are metallic, electrical conductive fins that hang on the leno threads.

Bricht nun ein Faden, so sackt die auf dem Faden sitzende Lamelle durch ihr Eigengewicht ab und schließt einen elektrischen Kontakt, wodurch der Antrieb der Webmaschine stillgesetzt wird.If a thread breaks now, the lamella sitting on the thread sags their own weight and closes an electrical contact, whereby the Drive of the loom is stopped.

Es hat sich nun allerdings herausgestellt, dass die Überwachung der Dreherfäden mittels Lamellen bei verschiedenen Fäden nicht durchführbar ist. Bei dünnen oder empfindlichen Fäden, wie z. B. Fiberglasfäden, kann die Belastung durch die Lamellen so hoch sein, dass diese allein durch das Gewicht der Lamellen brechen. Es sind daher bereits auch Methoden zur Überwachung der Dreherfäden durch Lichtschranken, Scanner u. ä. bekannt geworden. Es hat sich jedoch herausgestellt, dass die Zuverlässigkeit solcher Systeme auf Grund der Staubanfälligkeit sehr gering ist, und auch die Ansprechzeiten zu lang sind.However, it has now been found that the monitoring of the Leno threads cannot be carried out with lamellas on different threads is. With thin or sensitive threads, such as. B. fiberglass threads can the load on the lamellae should be so high that the Break the weight of the slats. There are therefore already methods for Monitoring of the leno threads by light barriers, scanners and. known become. However, it has been found that reliability such systems is very low due to the susceptibility to dust, and also the response times are too long.

Insbesondere bei der Verwendung der eingangs genannten Dreherkantenapparate mit einer Drehrichtungsumkehr, d. h. bei Dreherkantenapparaten, durch die die Dreherfäden auf der Zuführungsseite, d. h. im Hinterfach, verdrillt werden, besteht bei dem Einsatz von Kettfadenwächtern in Form von Lamellen die Gefahr, dass selbst beim Fadenbruch die Lamellen nicht herabfallen, da ansonsten die Baumwollfäden stark aneinander klammern und somit selbst der gebrochene Faden die Lamelle weitertragen kann. Es besteht die Gefahr, dass der gerissene Faden hierbei mit dem anderen noch intakten Faden durch dessen Öse des Dreherkantenapparates gezogen wird. Selbst bei einer Drehrichtungsumkehr, also dann, wenn auf der Zuführungsseite die Dreherfäden entdrillt werden, fällt die Litze dann nicht ab.Especially when using the leno selvedge devices mentioned at the beginning with a reversal of direction of rotation, d. H. with leno edging devices, through which the leno threads on the feed side, d. H. in the back compartment, are twisted when using warp thread monitors in shape of slats the danger that even if the thread breaks, the slats will not fall down, otherwise the cotton threads cling strongly and thus even the broken thread can carry the slat on. It there is a risk that the broken thread will still be with the other intact thread is pulled through the eye of the leno selvedge. Even if the direction of rotation is reversed, i.e. if on the The leno threads are untwisted, the strand does not fall from.

Der Erfindung liegt daher die Aufgabe zu Grunde, eine Vorrichtung der eingangs genannten Art bereitzustellen, mit der es möglich ist, Fadenbrüche, auch bei in ihrer Drehrichtung umkehrbaren, mit Armen versehenen Drehekantenapparaten sicher zu detektieren, mithin bei solchen Dreherkantenapparaten, die auf der Seite der Zuführung der Dreherfäden eine Verdrillung bewirken, die durch Drehrichtungsumkehr wieder aufgehoben werden muss.The invention is therefore based on the object of a device to provide the type mentioned at the beginning, with which it is possible Thread breaks, even with arms reversible in their direction of rotation provided rotating edge devices to be reliably detected, with such Dreherkantenapparaten, on the side of the supply of leno threads cause a twist by reversing the direction of rotation again must be canceled.

Zur Lösung der Aufgabe wird bei einem bekannten Dreherkantenapparat mit mindestens zwei Armen zur Führung von mindestens zwei Dreherfäden, wobei durch Rotation der Arme die Dreherfäden miteinander verdrehbar sind, vorgeschlagen, dass die Vorrichtung zur Ermittlung von Fadenbrüchen eine Einrichtung zur Ermittlung der Eigenschwingungen der Arme aufweist. Hierbei wird von folgender Überlegung ausgegangen:
Die Arme des Dreherkantenapparates stehen durch die endseitig in den Ösen der Arme geführten Dreherfäden unter Spannung. Während der Rotation führen die Arme eine im Wesentlichen gleichförmige Drehbewegung aus. Das Schwingungsverhalten der Arme ist beim Stoppen der Drehbewegung gedämpft, wobei die Dämpfung durch die gespannte Führung der Dreherfäden in den Ösen der Arme bewirkt wird. Kommt es zum Bruch des Dreherfadens, dann ist der Arm, durch dessen Öse kein Dreherfaden mehr geführt ist, ohne Last, mithin ohne Dämpfung. Das hat zur Folge, dass bei Abschluss der entsprechenden Rotationsbewegung dieser Arm in eine Schwingung versetzt wird, die sich erheblich von der Schwingung bzw. dem Schwingungsverlauf unterscheidet, die der Arm unter der Last des Dreherfadens beim Stoppen ausübt. Das Eigenschwingungsverhalten der Arme bzw. der sich hieraus ergebende Schwingungsverlauf lässt somit unmittelbar eine Aussage über den Zustand der Dreherfäden zu.To achieve the object, it is proposed in a known leno selvedge apparatus with at least two arms for guiding at least two leno threads, the leno threads being rotatable with one another by rotating the arms, that the device for determining yarn breaks has a device for determining the natural vibrations of the arms. The following consideration is assumed:
The arms of the leno selvedge apparatus are under tension by the leno threads guided in the ends of the arms. During rotation, the arms perform a substantially uniform rotation. The vibration behavior of the arms is damped when the rotary movement is stopped, the damping being brought about by the tensioned guidance of the leno threads in the eyelets of the arms. If the leno thread breaks, the arm, through the eyelet of which the leno thread is no longer guided, is without load and therefore without damping. As a result, upon completion of the corresponding rotational movement, this arm is set into an oscillation which differs considerably from the oscillation or the course of the oscillation which the arm exerts under the load of the leno thread when stopping. The natural vibration behavior of the arms or the resulting vibration profile thus allows a direct statement to be made about the condition of the leno threads.

Wesentlich hierbei ist, dass die Einrichtung zur Ermittlung des Schwingungsverhaltens der Arme mit den Armen nicht in Kontakt steht, mithin berührungslos arbeitet, so dass die Masse der Arme unverändert bleibt. Die Masse der Arme ist gering zu halten, da ansonsten die erforderlichen hohen Beschleunigungswerte von dem Dreherkantenapparat nicht zu realisieren sind.It is essential here that the device for determining the Vibration behavior of the arms is not in contact with the arms, therefore works without contact, so that the mass of the arms remains unchanged remains. The mass of the arms is to be kept low, otherwise the required high acceleration values from the leno selvedge cannot be realized.

Im Einzelnen ist vorgesehen, dass die Einrichtung zur Ermittlung des Schwingungsverhaltens der Arme im Bereich der Arme Mittel zum Aufbau eines Magnetfeldes aufweist, wobei eine Sensoreinheit zur Ermittlung von Veränderungen des Magnetfeldes durch die Bewegung der magnetisch leitfähigen Arme des Dreherkantenapparates vorgesehen ist, und wobei eine Auswerteeinheit vorgesehen ist, wobei durch die Auswerteeinheit die Schwingungsspektren der durch die Arme erzeugten Eigenschwingungen bei gerissenem und bei intaktem Faden verglichen werden, wobei der Auswerteeinheit eine Signalausgabeeinheit nachgeordnet ist. Durch die Rotation der magnetisch leitfähigen Arme findet eine Veränderung des Magnetfeldes statt, wobei das Maß der Änderung des Magnetfeldes das Schwingungsverhalten der Arme wiederspiegelt. Das heißt, es ergibt sich entsprechend der Bewegung der Arme ein Schwingungsverlauf, der korrespondierend ein entsprechendes Signal in der Spule bzw. dem Hallsensor als Sensoreinheit hervorruft. Diese Signale, die den Schwingungsverläufen der Arme im Zustand des gerissenen bzw. intakten Fadens entsprechen, werden dann in der Auswerteeinheit miteinander verglichen, um nach Vergleich eine Aussage darüber zu treffen, ob der Dreherfaden gebrochen oder intakt ist. In Abhängigkeit von dem Ergebnis dieses Vergleiches erfolgt ein Signal durch eine Signalausgabeeinheit an den Antrieb der Webmaschine mit dem Ziel, die Webmaschine gegebenenfalls stillzusetzen. Denkbar ist als Variante ebenfalls die Arme zu magnetisieren bzw. Permanentmagnete an den Arme anzuordnen, um hierdurch ein Magnetfeld zu erzeugen.Specifically, it is provided that the device for determining the Vibration behavior of the arms in the area of the arms of a magnetic field, a sensor unit for determining Changes in the magnetic field due to the movement of the magnetic conductive arms of the leno selvedge apparatus is provided, and wherein one Evaluation unit is provided, with the evaluation unit Vibration spectra of the natural vibrations generated by the arms if the thread is broken or intact, the Evaluation unit is arranged downstream of a signal output unit. Through the Rotation of the magnetically conductive arms finds a change in the Magnetic field instead, the measure of the change in the magnetic field that Reflecting the vibration behavior of the arms. That is, it results a waveform corresponding to the movement of the arms, the correspondingly a corresponding signal in the coil or Hall sensor as a sensor unit. These signals that the Vibrations of the arms in the state of torn or intact Faden correspond, are then together in the evaluation unit compared to make a statement after comparison whether the Leno thread is broken or intact. Depending on the result this comparison, a signal is made by a signal output unit to the Drive the weaving machine with the aim of the weaving machine if necessary shut down. As a variant, it is also conceivable to magnetize the arms or to arrange permanent magnets on the arms, thereby a Generate magnetic field.

Die Sensoreinheit selbst kann induktiv bzw. auch kapazitivarbeitende Mittel zur Ermittlung der Schwingung der Arme des Dreherkantenapparates aufweisen. Kapazitive Mittel zur Ermittlung Schwingungen bzw. des Schwingungsverlaufes sind ein Kondensator, wobei entsprechend der Bewegung der Arme in einer bestimmten Frequenz eine Spannungsänderung im Kondensator erfolgt.The sensor unit itself can be inductive or capacitive-working means to determine the vibration of the arms of the leno selvedge exhibit. Capacitive means for determining vibrations or the Vibration curve are a capacitor, with the corresponding Movement of the arms in a certain frequency Voltage change in the capacitor takes place.

Gegenstand der Erfindung ist ebenfalls eine Webmaschine, gekennzeichnet durch eine Vorrichtung mit einem oder mehreren Merkmalen der zuvor beschriebenen Vorrichtung zur Ermittlung von Fadenbrüchen, wobei hierbei die Vorrichtung zur Ermittlung von Fadenbrüchen vorteilhaft im Vorderfach zwischen Dreherkantenapparat und Webschäften angeordnet ist.The invention also relates to a weaving machine by a device with one or more features of the above described device for determining thread breaks, wherein here the device for determining thread breaks advantageously in the front compartment is arranged between the leno selvedge and heald frames.

Gegenstand der Erfindung ist ebenfalls eine Webmaschine, insbesondere mit Webschäften sowie mindestens einem in seiner Drehrichtung umkehrbaren Dreherkantenapparat und eine Einrichtung zur Ermittlung von Fadenbrüchen an den Dreherfäden. Wie bereits an anderer Stelle ausgeführt ist bislang bekannt, die Dreherfäden im Hinblick auf einen Fadenbruch im Bereich des Hinterfaches zu überwachen. Dies ist mit verschiedenen Schwierigkeiten verbunden, wobei insbesondere hervorzuheben ist, dass bei sehr stark aneinander haftenden Fäden, wie z. B. Baumwollfäden, selbst bei gerissenem Faden im Bereich des Hinterfadens nicht gewährleistet ist, dass als Kettfadenwächter ausgebildete Lamellen tatsächlich herunterfallen und zu der gewünschten Stillsetzung des Antriebes der Webmaschine führen.The invention also relates to a weaving machine, in particular with heald frames and at least one in its direction of rotation reversible leno selvedge apparatus and a device for determining Thread breaks on the leno threads. As stated elsewhere is known so far, the leno threads with regard to a thread break in Monitor area of the back compartment. This is different Difficulties connected, in particular it should be emphasized that with very strongly adhering threads, such as. B. cotton threads, themselves in the event of a broken thread in the area of the rear thread, that slats designed as warp thread monitors actually fall down and to the desired shutdown of the drive of the weaving machine to lead.

Der Erfindung liegt daher die Aufgabe zu Grunde, bei einer Webmaschine der eingangs genannten Art mit einem in seiner Drehrichtung umkehrbaren Dreherkantenapparat eine Vorrichtung zur Ermittlung von Fadenbrüchen an Dreherfäden derart anzuordnen, dass durch die Verdrillung des Fadens im Hinterfach der Betrieb der Einrichtung zur Ermittlung von Fadenbrüchen von Dreherfäden nicht behindert wird.The invention is therefore based on the object in a weaving machine of the type mentioned with a reversible in its direction of rotation Dreherkantenapparat a device for determining thread breaks Arrange leno threads in such a way that by twisting the thread in the Back pocket of the operation of the device for determining thread breaks of Leno threads are not hindered.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Vorrichtung zur Ermittlung von Fadenbrüchen im Vorderfach insbesondere zwischen Webschäften und Dreherkantenapparat angeordnet ist. Im Vorderfach findet vor den Webschäften eine ungewollte Verdrillung der Fäden ohne Schussfaden nicht statt. Infolgedessen besteht dort die Möglichkeit der Anordnung der Vorrichtung zur Ermittlung von Fadenbrüchen, ohne dass deren Funktion in irgendeiner Weise durch die Verdrillung der Dreherfäden, wie dies im Hinterfach der Fall ist, negativ beeinflusst wird.The object is achieved in that the device to determine thread breaks in the front compartment, in particular between Heald frames and leno selvedge is arranged. Find in the front compartment an unwanted twisting of the threads in front of the heald frames Weft does not take place. As a result, there is a possibility of Arrangement of the device for determining thread breaks without their function in any way by twisting the leno threads, as is the case in the back compartment, is negatively influenced.

Im Einzelnen ist vorgesehen, dass die Vorrichtung zur Ermittlung von Fadenbrüchen nicht in Verbindung mit den Dreherfäden steht, d. h. als berührungslos arbeitende Vorrichtung ausgebildet ist. Denkbar sind hierbei im Einzelnen berührungslos arbeitende Sensoren, wie z. B. Lichtschranken, Scanner u. ä. Eine derartige Sensoreinheit zur Ermittlung von Fadenbrüchen steht vorteilhaft mit einer Auswerteeinheit und/oder unmittelbar einer Signalausgabeeinheit in Verbindung, wobei durch die Signalausgabeeinheit der Antrieb der Webmaschine ansteuerbar ist, d. h. im Zweifelsfall stillzusetzen ist.In detail, it is provided that the device for determining Thread breaks are not connected to the leno threads, d. H. as non-contact device is formed. Here are conceivable in particular non-contact sensors, such as. B. light barriers, Scanner u. Such a sensor unit for determining thread breaks stands advantageously with an evaluation unit and / or directly one Signal output unit in connection, whereby by the signal output unit the drive of the weaving machine can be controlled, d. H. in case of doubt is to be stopped.

Anhand der Zeichnungen wird die Erfindung nachstehend beispielhaft näher erläutert.

Figur 1
zeigt die schematische Anordnung des Dreherkanten-apparates an einer Webmaschine;
Figur 2
zeigt den Dreherkantenapparat gemäß Fig. 1 in vergrößerter Darstellung mit einer ausschnittsweisen Vergrößerung des wesentlichen Merkmale;
Figur 3
zeigt eine Darstellung des Dreherkantenapparates gemäß Fig. 2 in einer Ansicht von oben mit einer ausschnittsweisen Vergrößerung der wesentlichen Merkmale;
Figur 4
zeigt die Einrichtung zur Ermittlung des Schwingungsverhaltens, umfassend eine Sensoreinheit, eine Auswerteeinheit und eine Signalausgabeeinheit;
Figur 5
zeigt den Schwingungsverlauf der Arme bei starker Dämpfung durch die Spannung des Dreherfadens;
Figur 6
zeigt den Schwingungsverlauf gemäß Fig. 5 bei schwacher Dämpfung des Dreherfadens.
The invention is explained in more detail below by way of example with reference to the drawings.
Figure 1
shows the schematic arrangement of the leno edging apparatus on a weaving machine;
Figure 2
shows the Dreherkantenapparat according to Figure 1 in an enlarged view with a partial enlargement of the essential features.
Figure 3
shows a representation of the leno selvedge apparatus according to Figure 2 in a view from above with a partial enlargement of the essential features.
Figure 4
shows the device for determining the vibration behavior, comprising a sensor unit, an evaluation unit and a signal output unit;
Figure 5
shows the waveform of the arms with strong damping by the tension of the leno thread;
Figure 6
shows the waveform according to FIG. 5 with weak damping of the leno thread.

Aus Figur 1 ist die insgesamt mit 1 bezeichnete Spulenhalterung erkennbar, von der die beiden Dreherfäden 2 und 3 abgezogen werden. Die beiden Dreherfäden 2 und 3 werden durch den Fadenniederhalter 4 unter Spannung gehalten und umgelenkt. Dem mit 10 bezeichneten Dreherkantenapparat werden die beiden Dreherfäden 2, 3 auf der Rückseite, d. h. im Bereich des Hinterfaches H zugeführt. Dem Dreherkantenapparat 10 nachgeordnet sind die Webschäfte 20 sowie das Riet 21 und der Baum 22, der das Gewebe aufnimmt. Das Vorderfach V erstreckt sich nun von dem Punkt der Verdrillung der Dreherfäden mit dem Schussfaden bis zum Dreherkantenapparat. Der Dreherkantenapparat 10 zeigt den motorischen Antrieb 11 sowie die beiden diagonal einander gegenüberliegenden Arme 12, die insofern einen "Propeller" bilden. Die Arme 12 besitzen endseitig Ösen 12a zur Durchführung der Dreherfäden 2, 3. An dem Gehäuse des Motors 11 sind mindestens zwei Magnete 13 vorgesehen sowie dahinter jeweils eine Sensoreinheit 14, beispielsweise in Form einer Spule, eines Hallsensors oder eines Kondensators. Vorteilhaft ist, wenn sowohl der Magnet, als auch der Sensor und auch die Arme 12 des Dreherkantenapparates 10 im Stillstand hintereinander angeordnet sind. Dann kann durch den Sensor der Schwingungsverlauf sauber und störungsfrei erfasst werden, der sich ergibt, wenn der Arm unter der Spannung des Dreherfadens steht, mithin in seiner Eigenschwingung gedämpft ist, oder aber der Dreherfaden gerissen ist, und eine Dämpfung der Eigenschwingung des Armes im Wesentlichen nicht vorhanden ist. Auch zusätzlich kann das abweichende Schwingungs- bzw. Frequenzspektrum gedämpfter Schwingung der Arme auf Grund der anliegenden Spannung des Dreherfadens zur Auswertung herangezogen werden. Aus den Fig. 5 und 6 ist erkennbar, wie ein derartiger Schwingungsverlauf bei intaktem bzw. bei gerissenem Dreherfaden ausgebildet ist. Hier können Verfahren wie z. B. Fuzzy-Logik zusätzlich eingesetzt werden.The bobbin holder, designated overall by 1, can be seen from FIG. 1, from which the two leno threads 2 and 3 are subtracted. The two Leno threads 2 and 3 are held down by the thread retainer 4 Tension held and redirected. The leno device designated 10 the two leno threads 2, 3 on the back, d. H. fed in the area of the rear compartment H. The leno selvedge 10 downstream are the heald frames 20 as well as the reed 21 and the tree 22, that picks up the tissue. The front compartment V now extends from that Point of twisting of the leno threads with the weft thread up to Leno device. The leno selvedge 10 shows the motor Drive 11 and the two diagonally opposite arms 12, which form a "propeller". The arms 12 have ends Eyelets 12a for passing the leno threads 2, 3. On the housing of the Motors 11 are provided at least two magnets 13 and behind them each have a sensor unit 14, for example in the form of a coil, one Hall sensor or a capacitor. It is advantageous if both the Magnet, as well as the sensor and the arms 12 of the leno selvedge 10 are arranged one behind the other at a standstill. Then through the sensor detects the course of the vibration cleanly and without interference which arises when the arm is under the tension of the leno thread stands, therefore its natural vibration is damped, or the Leno thread is broken, and a damping of the natural vibration of the Poor essentially does not exist. In addition, that can deviating vibration or frequency spectrum damped Vibration of the arms due to the tension of the leno thread be used for evaluation. 5 and 6 is recognizable how such a waveform with intact or at torn leno thread is formed. Here procedures such. B. Fuzzy logic can also be used.

Aus Fig. 4 ist erkennbar, dass durch die Sensoreinheit 14, beispielsweise eine Spule oder einen Hallsensor als induktiv arbeitende Sensoren bzw. einen Kondensator die Änderung des Magnetfeldes als Frequenzspektrum ermittelt wird und in einer Auswerteeinheit 14a die Dämpfung bzw. der Schwingungsverlauf, der durch die Dämpfung bewirkt wird und/oder das Schwingungsspektrum bei gebrochenen mit dem bei intaktem Dreherfaden verglichen wird, wobei dann in Abhängigkeit von dem Ergebnis des Vergleiches von der Signalausgabeeinheit 14b ein Signal zum Stillsetzen des Antriebs der Webmaschine erfolgt.It can be seen from FIG. 4 that the sensor unit 14, for example a coil or a Hall sensor as inductive sensors or a capacitor the change of the magnetic field as a frequency spectrum is determined and in an evaluation unit 14a the damping or Vibration curve that is caused by the damping and / or that Vibration spectrum for broken with that with intact leno thread is compared, then depending on the result of the Compare a signal to stop from the signal output unit 14b the drive of the weaving machine takes place.

Claims (14)

Vorrichtung zur Ermittlung von Fadenbrüchen von Dreherfäden im Bereich von Dreherkantenapparaten bei Webmaschinen, wobei der Dreherkantenapparat mindestens zwei Arme zur Führung von mindestens zwei Dreherfäden aufweist, wobei durch Rotation der Arme die Dreherfäden miteinander verdrehbar sind,
dadurch gekennzeichnet, dass die Vorrichtung (12, 13, 14, 14a) zur Ermittlung von Fadenbrüchen eine Einrichtung (13, 14) zur Ermittlung der Eigenschwingungen der Arme (12) aufweist.Device for determining yarn breaks in leno threads in the area of leno selvedge devices in weaving machines, the leno selvedge device having at least two arms for guiding at least two leno threads, the leno threads being rotatable with one another by rotation of the arms,
characterized in that the device (12, 13, 14, 14a) for determining thread breaks has a device (13, 14) for determining the natural vibrations of the arms (12). Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass die Einrichtung (13, 14) zur Ermittlung der Eigenschwingungen der Arme (12) mit den Armen (12) nicht in Kontakt steht.Device according to claim 1,
characterized in that the device (13, 14) for determining the natural vibrations of the arms (12) is not in contact with the arms (12). Vorrichtung nach Anspruch 2,
dadurch gekennzeichnet, dass die Dämpfung bzw. der Schwingungsverlauf und/oder das Schwingungspektrum der Arme (12) im Stillstand nach Abschluss der Rotation mit gebrochenen und intakten Dreherfaden (2, 3) ermittelt wird.Device according to claim 2,
characterized in that the damping or the course of the oscillation and / or the oscillation spectrum of the arms (12) at a standstill after completion of the rotation is determined with broken and intact leno threads (2, 3). Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet, dass die Einrichtung (13, 14) zur Ermittlung des Schwingungsverhaltens Mittel (13) zum Aufbau eines Magnetfeldes im Bereich der Arme (12) aufweist, wobei eine Sensoreinheit (14) zur Ermittlung von Veränderungen des Magnetfeldes durch die Bewegung der magnetisch leitfähigen Arme (12) des Dreherkantenapparates (10) vorgesehen ist, und wobei eine Auswerteeinheit (14a) vorgesehen ist, wobei durch die Auswerteeinheit (14a) die Schwingungsspektren bzw. die Dämpfung der durch die Arme (12) erzeugten Schwingungen bei gerissenem und bei intaktem Dreherfaden (2, 3) verglichen werden, wobei der Auswerteeinheit (14a) eine Signalausgabeeinheit (14b) nachgeordnet ist.Device according to claim 3,
characterized in that the device (13, 14) for determining the vibration behavior has means (13) for establishing a magnetic field in the region of the arms (12), a sensor unit (14) for determining changes in the magnetic field due to the movement of the magnetically conductive Arms (12) of the leno selvedge apparatus (10) are provided, and an evaluation unit (14a) is provided, the oscillation spectra or the damping of the vibrations generated by the arms (12) by the evaluation unit (14a) when the leno thread is broken and intact (2, 3) are compared, the evaluation unit (14a) being followed by a signal output unit (14b). Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, dass die Signalausgabeeinheit (14b) mit dem Antrieb der Webmaschine in Verbindung steht.Device according to claim 4,
characterized in that the signal output unit (14b) is connected to the drive of the weaving machine. Vorrichtung nach Anspruch 3,
dadurch gekennzeichnet, dass die Signalausgabeeinheit (14b) mit einer Anzeigeeinrichtung in Verbindung steht.Device according to claim 3,
characterized in that the signal output unit (14b) is connected to a display device. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, dass zum Aufbau des Magnetfeldes an den Armen (12) Permantenmagnete vorgesehen sind.Device according to claim 4,
characterized in that permanent magnets are provided on the arms (12) to build up the magnetic field. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, dass die Sensoreinheit (14) induktiv, z. B. eine Spule oder einen Hallsensor oder kapazitiv arbeitende Mittel zur Ermittlung der Dämpfung oder des Schwingungsspektrums aufweist.Device according to claim 4,
characterized in that the sensor unit (14) inductively, for. B. has a coil or a Hall sensor or capacitive means for determining the damping or the vibration spectrum. Webmaschine insbesondere mit Webschäften, sowie mindestens einem in seiner Drehrichtung umkehrbaren Dreherkantenapparat und einer Einrichtung zur Ermittlung von Fadenbrüchen an den Dreherfäden,
dadurch gekennzeichnet, dass die Vorrichtung zur Ermittlung von Fadenbrüchen im Vorderfach (V) insbesondere zwischen dem Dreherkantenapparat (10) und den Webschäften (20) angeordnet ist.Loom, in particular with heald frames, as well as at least one leno selvedge apparatus which is reversible in its direction of rotation and a device for determining yarn breaks on the leno threads
characterized in that the device for determining thread breaks in the front compartment (V) is arranged in particular between the leno selvedge apparatus (10) and the heald frames (20). Webmaschine nach Anspruch 9,
dadurch gekennzeichnet, dass die Vorrichtung (12, 13, 14, 14a) zur Ermittlung von Fadenbrüchen nicht in Verbindung mit den Dreherfäden (2, 3) steht.Loom according to claim 9,
characterized in that the device (12, 13, 14, 14a) for determining thread breaks is not connected to the leno threads (2, 3). Webmaschine nach Anspruch 9,
dadurch gekennzeichnet, dass die Vorrichtung (12, 13, 14, 14a) zur berührungslosen Ermittlung von Fadenbrüchen eine Sensoreinheit (14) zur Erfassung des Fadenbruches aufweist.Loom according to claim 9,
characterized in that the device (12, 13, 14, 14a) for contactless determination of thread breaks has a sensor unit (14) for detecting the thread break. Webmaschine nach Anspruch 11,
dadurch gekennzeichnet, dass die Sensoreinheit (14) mit einer Signalausgabeeinheit (14b) in Verbindung steht, wobei durch die Signalausgabeeinheit (14b) der Antrieb der Webmaschine ansteuerbar ist.Loom according to claim 11,
characterized in that the sensor unit (14) is connected to a signal output unit (14b), the drive of the weaving machine being controllable by the signal output unit (14b). Webmaschine,
gekennzeichnet durch
eine Vorrichtung gemäß einem oder mehrerer der Ansprüche 1 bis 8.loom
marked by
a device according to one or more of claims 1 to 8. Webmaschine nach Anspruch 13,
dadurch gekennzeichnet, dass die Vorrichtung zur Ermittlung von Fadenbrüchen im Vorderfach (V) angeordnet ist.Weaving machine according to claim 13,
characterized in that the device for determining thread breaks is arranged in the front compartment (V).
EP02011125A 2001-06-09 2002-05-18 Device for detecting leno yarn breakages on weaving looms and loom, particularly with heald frames and a device for detecting yarn breakages Expired - Lifetime EP1270780B1 (en)

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DE10128079 2001-06-09
DE10128079 2001-06-09
DE10133800 2001-07-11
DE10133800A DE10133800C1 (en) 2001-06-09 2001-07-11 Device for determining thread breaks in leno threads in weaving machines or looms, in particular with heald frames, and a device for determining thread breaks

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CN105937074A (en) * 2014-04-22 2016-09-14 奉化市骏兴玩具有限公司 Improved automatic stopping device and automatic stopping method for broken yarn
CN108239821A (en) * 2016-12-27 2018-07-03 天津市华之阳特种线缆有限公司 Insulative yarn broken string automatic detector

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JP5217992B2 (en) * 2008-12-10 2013-06-19 株式会社豊田自動織機 Warp cutting detection device in loom
DE102012009420A1 (en) * 2012-05-11 2013-11-14 Gebrüder Klöcker GmbH Device for producing a fabric
EP3162934B1 (en) * 2015-10-28 2018-03-28 Gebrüder Klöcker GmbH Device for forming a leno selvedge, in particular for a loom, and projectile weaving loom equipped with said device
CN105671760B (en) * 2016-04-15 2017-12-05 苏州市丹纺纺织研发有限公司 A kind of oscillatory type broken warp indication device
CN106192168B (en) * 2016-08-29 2017-11-24 青岛天一集团红旗纺织机械有限公司 A kind of air-jet loom leon-selvedge mechanism experimental rig
CN110997999B (en) * 2017-08-24 2021-11-26 悉达尔斯·罗希亚 Device and method for detecting breakage or termination of warp yarns of a loom

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CN105937074A (en) * 2014-04-22 2016-09-14 奉化市骏兴玩具有限公司 Improved automatic stopping device and automatic stopping method for broken yarn
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US6814107B2 (en) 2004-11-09
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HK1049504A1 (en) 2003-05-16
EP1270780B1 (en) 2007-03-14
ES2282343T3 (en) 2007-10-16
HK1049504B (en) 2006-01-13
EP1270780A3 (en) 2004-04-14
CN1225578C (en) 2005-11-02
CN1390996A (en) 2003-01-15
JP3578154B2 (en) 2004-10-20
CZ300517B6 (en) 2009-06-10
DE50209702D1 (en) 2007-04-26
ATE356899T1 (en) 2007-04-15
DK1270780T3 (en) 2007-04-23
US20030024588A1 (en) 2003-02-06

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