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EP1100987B1 - Stitch-forming machine and method for detecting malfunctions - Google Patents

Stitch-forming machine and method for detecting malfunctions Download PDF

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Publication number
EP1100987B1
EP1100987B1 EP99961064A EP99961064A EP1100987B1 EP 1100987 B1 EP1100987 B1 EP 1100987B1 EP 99961064 A EP99961064 A EP 99961064A EP 99961064 A EP99961064 A EP 99961064A EP 1100987 B1 EP1100987 B1 EP 1100987B1
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EP
European Patent Office
Prior art keywords
thread
stitch
forming machine
machine according
malfunction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99961064A
Other languages
German (de)
French (fr)
Other versions
EP1100987A1 (en
Inventor
Kurt Christ
Thomas Müller
Kurt Stephan
Sevki Hosagasi
Ulrich Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSM-Kaiserslautern Stickmaschinen GmbH
Original Assignee
KSM-Kaiserslautern Stickmaschinen GmbH
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Publication date
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Publication of EP1100987A1 publication Critical patent/EP1100987A1/en
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Publication of EP1100987B1 publication Critical patent/EP1100987B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/08—Thread-tensioning arrangements
    • D05C11/14—Stop motions responsive to thread tension or breakage
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/36—Devices for stopping drive when abnormal conditions occur, e.g. thread breakage
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C13/00—Auxiliary devices incorporated in embroidering machines, not otherwise provided for; Ancillary apparatus for use with embroidering machines
    • D05C13/02—Counting, measuring, indicating, warning, or safety devices

Definitions

  • the present invention relates to a stitch-forming Machine, in particular embroidery machine, sewing machine or sewing unit, with at least one thread for Embroidery or sewing, namely with at least one Upper thread and with at least one lower thread, and with a device for detecting malfunctions in the area of the thread.
  • the present invention further relates to a Procedure for detecting malfunctions in the area at least one thread for embroidery or sewing, namely at least one upper thread and / or at least one bobbin thread, one stitch-forming Machine, especially an embroidery machine, one Sewing machine or a sewing machine.
  • the stitch-forming machine can be used in this Fall even create an embroidery design, which is so generated embroidery designs, however, not on its carrier is liable because the knot could not be made. As a result, the embroidery pattern can be done by itself slight pull on the thread can be destroyed.
  • evaluation means are at least one averager and have at least one comparator for time ranges formed by time division of the electrical signal from the Detection device is delivered, respectively formed at least one mean, the Presence of a malfunction and / or the nature of the Malfunction by comparing each Average values with predefined threshold values is recognized.
  • Figure 1 is an embodiment of a stitch-forming machine in the form of an embroidery machine according to the present invention.
  • the stitch-forming machine has an embroidery head 1, of those essential to the invention Components is shown.
  • the embroidery head 1 has several threads in the form of upper threads 4 with different properties and colors, whereby however with only one upper thread at all times 4 is embroidered.
  • Figure 1 denotes the thread transmitter 2; is for embroidery in Figure 1 the thread feeder 3 in action.
  • the upper threads 4 are placed around the thread rod 5 and then to Thread feeder 2, 3 guided; afterwards are the Upper threads 4 threaded into the sewing needles 7, 8.
  • Thread rod 5 at both ends in bending elements 6 attached.
  • Each of the bending elements 6 instructs a permanent magnet 9 on its free end, with respect to the permanent magnet 9 over an air gap there is a Hall sensor 10 which proportional to the magnetic field strength emits electrical voltage signal.
  • the Hall sensor 10 is associated with the Amplification circuit on a circuit board 11 housed, the bending element 6 also this board 11 is attached so that the air gap between the permanent magnet 9 and the Hall sensor 10 has a clearly defined width (cf. Figure 2, in which a detection unit with board 11th the stitch-forming machine of Figure 1 schematically is shown).
  • the air gap is now enlarged. Since the Hall sensor 10 in the stray field of the permanent magnet 9 is located, the measured at the Hall sensor 10 magnetic field strength is lower if the Distance of the Hall sensor 10 to the permanent magnet 9 increased. Here is a change in distance of a few millimeters sufficient to get one generate evaluable signal.
  • the force on a bending element 6 also varies the position of the working thread.
  • the sum of the two Forces on the bending elements 6 is however here equal to twice the thread force.
  • To the thread force in to grasp this context are the signals of the two measuring elements 9, 10 summed, the The signals are summed in a microprocessor the analog / digital conversion of the signals takes place.
  • the Natural frequency of the bending element 6 is significantly higher than the frequency range of the measurement signal. This is achieved in the present invention by that the double thread force is used as a measuring force is selected and therefore the bending element 6 stiff can be.
  • FIG. 3 shows a typical of the Hall sensor 10 stitch-forming machine from Figure 1 electrical voltage signal, with both the Upper thread 4 and the lower thread is present.
  • the voltage signal in a fixed ratio to the machine shaft shows two maxima, whereby the first maximum occurs when the upper thread 4 around the bobbin case is pulled; the second maximum arises when the thread take-up 3 knots tightens.
  • the upper thread 4 is monitored or controlled in the first area of the tension signal, which extends to ⁇ A.
  • the second area of the tension signal which extends from ⁇ A to ⁇ E , the lower thread is monitored or checked.
  • the state that there is no malfunction FK can be recognized by the fact that both the first mean M1 above the corresponding threshold S1 as well the second mean M2 above the corresponding one Threshold S2 lies.
  • the state that a malfunction FU of the lower thread is present can be identified from the mean value M2 become. If the mean M2 is below the associated Threshold S2 is not necessarily due to a malfunction FU of the lower thread but can also be due to a miss stitch FS be caused. To make a decision in this regard to be able to meet, will change the Voltage signal tracked across multiple stitches. If the supply of bobbin thread is about to go Going to the end shows the signal of the mean M2 the course indicated in Figure 4:
  • the signal of the Mean M2 at stitch n-1 is larger than that assigned threshold S2, but less than that Average M2 signal at stitch n-2. If the Falling below threshold S2 at stitch n, consider the gradient of the signal of the Mean M2 in the last three stages.
  • This first threshold S1 is lower than that second threshold value S2 selected (see FIG. 5), where the first threshold S1 is approximately half as large the second threshold value S2 for the signal of the Mean M2 in the bobbin thread detection.
  • the one caused by the amplification circuit Gain is set so that a sufficient tension level with minimal thread force is present.
  • the first threshold S1 and the second Threshold S2 are then at this thread force or fixed at this thread tension.
  • the Gain circuit with very high thread force can be overridden. This will, however Operation of the overall system in no form impaired because the signals when Errors are getting weaker anyway.
  • the lower limit and the upper limit will be depending on the pattern in the setting phase Central control communicated to the embroidery heads 1;
  • the 1 within an embroidery head Threads 4 depending on the nature and different lower and / or upper types Have limit values.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

The invention relates to a stitch-forming machine, notably an embroidery machine, sewing machine or sewing system, comprising at least one thread for embroidering or sewing, namely at least one upper thread (4) and at least one lower thread, as well as a device for recognizing malfunctions in the area of the thread. The invention also relates to a corresponding method. The device comprises at least one thread bar (5) by means of which the upper thread (4) is deflected. The thread bar (5) can be deflected from an unsolicited initial position against a restoring force in the direction of a force which results from the tension of the upper thread (4) and is applied in the plane defined by the deflected upper thread (4). At least one detection device for detecting the thread bar deflection caused by the thread tension force is assigned to the thread bar. The device further has evaluation means which present at least one averaging element and at least one comparator.

Description

Die vorliegende Erfindung betrifft eine stichbildende Maschine, insbesondere Stickmaschine, Nähmaschine oder Nähanlage, mit mindestens einem Faden zum Sticken oder Nähen, nämlich mit mindestens einem Oberfaden und mit mindestens einem Unterfaden, und mit einer Vorrichtung zum Erkennen von Fehlfunktionen im Bereich des Fadens.The present invention relates to a stitch-forming Machine, in particular embroidery machine, sewing machine or sewing unit, with at least one thread for Embroidery or sewing, namely with at least one Upper thread and with at least one lower thread, and with a device for detecting malfunctions in the area of the thread.

Die vorliegende Erfindung betrifft des weiteren ein Verfahren zum Erkennen von Fehlfunktionen im Bereich mindestens eines Fadens zum Sticken oder Nähen, nämlich mindestens eines Oberfadens und/oder mindestens eines Unterfadens, einer stichbildenden Maschine, insbesondere einer Stickmaschine, einer Nähmaschine oder einer Nähanlage.The present invention further relates to a Procedure for detecting malfunctions in the area at least one thread for embroidery or sewing, namely at least one upper thread and / or at least one bobbin thread, one stitch-forming Machine, especially an embroidery machine, one Sewing machine or a sewing machine.

Bei derartigen stichbildenden Maschinen werden zum Sticken gemäß dem Stepstichverfahren im Regelfall zwei Fäden verwendet, nämlich der sogenannte Oberfaden, der durch die Nähnadel geführt ist, und der sogenannte Unterfaden, der mittels einer Spulenkapsel zum Verknoten verwendet wird. Bei der Stichbildung sind der Oberfaden und der Unterfaden gleichermaßen beteiligt, so daß das Fehlen eines der beiden Fäden zu einer unerwünschten Fehlfunktion des stich- bzw. stickbildenden Vorgangs führt.In such stitch-forming machines Embroidery according to the step stitch procedure as a rule used two threads, namely the so-called Upper thread, which is passed through the sewing needle, and the so-called bobbin thread, which by means of a Bobbin case is used for knotting. In the Stitch formation is the upper thread and the lower thread equally involved, so the absence of one of the both threads to an undesirable malfunction of the leads stitch or embroidery process.

Wenn nun der Oberfaden reißt oder der Oberfadenvorrat im Begriffe ist, zu Ende zu gehen, ist dieser Zustand durch Beobachten von außen ohne weiteres zu erkennen; wenn jedoch der Unterfaden reißt oder der Unterfadenvorrat im Begriffe ist, zu Ende zu gehen, ist dieser Zustand von außen nicht unbedingt zu erkennen. Die stichbildende Maschine kann in diesem Fall sogar ein Stickmuster erzeugen,wobei das derart erzeugte Stickmuster jedoch nicht an seinem Träger haftet, weil die Verknotung nicht erfolgen konnte. Demzufolge kann das Stickmuster allein schon durch leichtes Ziehen am Faden vernichtet werden.If the upper thread breaks or the upper thread supply is about to end, this is the state easily recognized by external observation; however, if the lower thread breaks or the Bobbin thread is about to come to an end this condition is not necessarily from the outside detect. The stitch-forming machine can be used in this Fall even create an embroidery design, which is so generated embroidery designs, however, not on its carrier is liable because the knot could not be made. As a result, the embroidery pattern can be done by itself slight pull on the thread can be destroyed.

Aus den vorgenannten Gründen sind bei gattungsgemäßen stichbildenden Maschinen Meßeinrichtungen erforderlich, die das Fehlen des Oberfadens und/oder des Unterfadens automatisch erkennen. Obwohl das Fehlen des Oberfadens zwar leicht durch Beobachten zu erkennen ist, wird eine automatisierte Erkennung benötigt, um beispielsweise bei Auftreten eines Fadenbruchs die stichbildende Maschine sofort anhalten zu können.For the reasons mentioned above are in generic stitch-forming machines required the absence of the upper thread and / or automatically detect the bobbin thread. Although that Absence of the upper thread is easy due to observation is an automated detection needed, for example, when a Thread break the stitch-forming machine immediately to be able to stop.

Hierbei kommen heutzutage für die Oberfadenüberwachung verschiedene Prinzipien zum Einsatz, wie beispielsweise optische Methoden, bei denen der Oberfaden durch eine Art Lichtschranke geführt wird.These days come for the Upper thread monitoring different principles for Use, such as optical methods, at which the upper thread through a kind of light barrier to be led.

Alternativ kommt auch die Überwachung und Erkennung durch Fadenkraftmessung in Betracht, denn bei der Schlaufenbildung und beim Verknoten wird der Faden gezogen; durch Messung dieser durch die Fadenspannung hervorgerufenen Fadenkraft kann dann erkannt werden, ob der Oberfaden vorhanden ist.Alternatively, there is also monitoring and detection by thread force measurement, because with the Loop formation and knotting becomes the thread drawn; by measuring this by the thread tension induced thread force can then be recognized whether the upper thread is present.

Schließlich wird auch eine Oberfadenüberwachung durch einen elektrischen Schalter praktiziert, indem der Oberfaden über eine Feder geführt wird, die durch die Fadenspannung einen elektrischen Kontakt schließt.Finally, upper thread monitoring is also carried out practiced an electrical switch by the Upper thread is guided over a spring by the Thread tension closes an electrical contact.

Für die Unterfadenüberwachung werden zumeist berührungslose optische Methoden eingesetzt, wobei die Unterfadenüberwachung wegen der bestehenden Platzprobleme nicht selten beträchtliche Schwierigkeiten aufwirft. Aus diesem Grunde werden hierfür die berührungslosen Verfahren, wie etwa optische Methoden, eingesetzt, die jedoch aufgrund ihrer Staubempfindlichkeit nicht sehr zuverlässig sind.For the bobbin thread monitoring are mostly non-contact optical methods are used, whereby the bobbin thread monitoring due to the existing Space problems are often considerable Poses difficulties. For this reason for this the contactless methods, such as optical methods used, but due to their sensitivity to dust is not very reliable are.

In bezug auf eine Nähmaschine ist eine Einrichtung zur Fehlsticherkennung bekannt (US-A-4 170 951), in der die Oberfadenkraft gemessen wird. Auch die Druckschriften DE-C-38 39 733 und die DE-C-40 30 420 beschäftigen sich mit diesem Problem, ohne allerdings in den vorgestellten Lösungsansätzen voll zu überzeugen.With regard to a sewing machine is a device known for misstitch detection (US-A-4 170 951), in which the upper thread force is measured. Also the Publications DE-C-38 39 733 and DE-C-40 30 420 deal with this problem without, however fully in the proposed approaches convince.

Ausgehend von den vorstehend dargelegten Nachteilen und Unzulänglichkeiten liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine gattungsgemäße stichbildende Maschine so auszubilden, daß mit der Vorrichtung zum Erkennen von Fehlfunktionen im Bereich des Fadens nicht nur der Oberfaden, sondern in baulich integrierter Weise gleichzeitig auch der Unterfaden überwacht werden kann.Based on the disadvantages set out above and shortcomings are due to the present Invention based on the object of a generic stitch-forming machine so that with the Device for detecting malfunctions in the Area of thread not just the upper thread, but in a structurally integrated manner at the same time Bobbin thread can be monitored.

Diese Aufgabe wird bei einer stichbildenden Maschine gemäß dem Oberbegriff des Patentanspruchs 1 dadurch gelöst, daß die Vorrichtung mindestens eine Fadenstange aufweist, mittels der der Oberfaden umgelenkt ist, daß die Fadenstange aus der unbelasteten Ausgangslage entgegen einer Rückstellkraft in Richtung einer aus der Spannung des Oberfadens resultierenden, in der durch den umgelenkten Oberfaden aufgespannten Ebene liegenden Fadenkraft auslenkbar ist, daß der Fadenstange mindestens eine Erfassungseinrichtung zum Erfassen der durch die Fadenkraft erfolgten Auslenkung der Fadenstange zugeordnet ist und daß Auswertemittel vorgesehen sind, die

  • mindestens einen Mittelwertbildner zum Bilden von jeweils mindestens einem Mittelwert für durch zeitliche Unterteilung gebildete Zeitbereiche mindestens eines von der Erfassungseinrichtung abgegebenen elektrischen Signals und
  • mindestens einen vergleicher zum Vergleichen der jeweiligen Mittelwerte mit jeweils vorgegebenen Schwellenwerten aufweisen.
This object is achieved in a stitch-forming machine according to the preamble of claim 1 in that the device has at least one thread rod, by means of which the upper thread is deflected, that the thread rod from the unloaded starting position against a restoring force in the direction of a resulting from the tension of the upper thread , in the plane spanned by the deflected upper thread lying thread force can be deflected, that the thread rod is assigned at least one detection device for detecting the deflection of the thread rod effected by the thread force and that evaluation means are provided which
  • at least one mean value generator for forming in each case at least one mean value for time ranges formed by time subdivision of at least one electrical signal emitted by the detection device and
  • have at least one comparator for comparing the respective mean values with respectively predetermined threshold values.

Ähnliche Vorrichtungen sind aus der DE-A-40 13 648 und aus der JP-A-1265-171 bekannt. Jedoch ist festzustellen, daß die in diesen Druckschriften dargelegten Vorrichtungen nur zur Überwachung der Oberfäden, nicht jedoch zur gleichzeitigen, baulich integrierten Überwachung des oder der Unterfäden dienen, so daß bei den in diesen Druckschriften vorgestellten Vorrichtungen eine Entscheidung dahingehend ausreicht, ob ein Signal vorhanden ist oder nicht.Similar devices are from DE-A-40 13 648 and known from JP-A-1265-171. However is determine that the in these documents devices set out only for monitoring the Upper threads, but not for simultaneous, structural integrated monitoring of the lower thread or threads serve so that the in these publications presented devices a decision is sufficient whether a signal is present or not.

Der eigentliche Signalverlauf wird bei den in der DE-A-40 13 648 und in der JP-A-1265-171 vorgestellten Lösungsansätzen nicht beachtet, was insofern einen entscheidenden Unterschied zur vorliegenden Erfindung darstellt, als bei der Erfindung gemäß deren Lehre ein Verfahren zum Erkennen von Fehlfunktionen im Bereich mindestens eines Fadens zum Sticken oder Nähen, nämlich mindestens eines Oberfadens und/oder mindestens eines Unterfadens, einer stichbildenden Maschine, insbesondere einer Stickmaschine, einer Nähmaschine oder einer Nähanlage, zur Verfügung gestellt wird, welches Verfahren die folgenden Schritte aufweist:

  • a) mindestens ein elektrisches Signal wird von mindestens einer Erfassungseinrichtung abgegeben,
  • b) für durch zeitliche Unterteilung gebildete Zeitbereiche des elektrischen Signals wird jeweils mindestens ein Mittelwert gebildet, und
  • c) das Vorliegen einer Fehlfunktion und/oder die Art der Fehlfunktion wird durch vergleichen der jeweiligen Mittelwerte mit jeweils vorgegebenen Schwellenwerten erkannt.
    • The actual signal curve is not taken into account in the solution approaches presented in DE-A-40 13 648 and in JP-A-1265-171, which represents a decisive difference from the present invention in that a method for the invention according to its teaching Detection of malfunctions in the area of at least one thread for embroidery or sewing, namely at least one upper thread and / or at least one lower thread, a stitch-forming machine, in particular an embroidery machine, a sewing machine or a sewing system, which method has the following steps:
  • a) at least one electrical signal is emitted by at least one detection device,
  • b) at least one mean value is formed in each case for time ranges of the electrical signal formed by time division, and
  • c) the presence of a malfunction and / or the type of malfunction is recognized by comparing the respective mean values with predefined threshold values.

    • Indem bei der stichbildenden Maschine gemäß der vorliegenden Erfindung Auswertemittel vorgesehen sind, die mindestens einen Mittelwertbildner und mindestens einen Vergleicher aufweisen, wird für die durch zeitliche Unterteilung gebildeten Zeitbereiche des elektrischen Signals, das von der Erfassungseinrichtung abgegeben wird, jeweils mindestens ein Mittelwert gebildet, wobei das Vorliegen einer Fehlfunktion und/oder die Art der Fehlfunktion durch Vergleichen der jeweiligen Mittelwerte mit jeweils vorgegebenen Schwellenwerten erkannt wird.By the stitch-forming machine according to the present invention evaluation means provided are at least one averager and have at least one comparator for time ranges formed by time division of the electrical signal from the Detection device is delivered, respectively formed at least one mean, the Presence of a malfunction and / or the nature of the Malfunction by comparing each Average values with predefined threshold values is recognized.

    Hierdurch kann mit der Vorrichtung zum Erkennen von Fehlfunktionen im Bereich des Fadens nicht nur der Oberfaden, sondern in baulich integrierter Weise gleichzeitig auch der Unterfaden überwacht werden.This allows the device for recognizing Malfunctions in the area of the thread not only the Upper thread, but in a structurally integrated manner the bobbin thread is also monitored at the same time.

    Die stichbildende Maschine gemäß der vorliegenden Erfindung kann verschiedene bevorzugte Ausführungsformen aufweisen, die sich unabhängig voneinander dadurch auszeichnen,

    • daß die Fadenstange einen kreisförmigen Querschnitt aufweist;
    • daß die Auslenkung der Fadenstange im wesentlichen proportional zur Fadenkraft ist;
    • daß die Fadenstange in ihren Endbereichen mit der Erfassungseinrichtung in Verbindung steht;
    • daß die der Fadenstange zugewandten Bereiche der Erfassungseinrichtung im wesentlichen außerhalb eines Stickkopfs der stichbildenden Maschine und die von der Fadenstange abgewandten Bereiche der Erfassungseinrichtung im wesentlichen innerhalb des Stickkopfs der stichbildenden Maschine vorgesehen sind;
    • daß der Stickkopf über mindestens zwei Oberfäden verfügt;
    • daß sich die Oberfäden in ihrer Beschaffenheit, Dicke, Farbe, Qualität, Reißfestigkeit und/oder Stärke voneinander unterscheiden;
    • daß jedem der Oberfäden ein Fadengeber zugeordnet ist;
    • daß der Oberfaden zumindest teilweise um die Fadenstange herumgeführt ist, durch den Fadengeber hindurchgeführt ist und in eine Nähnadel eingefädelt ist;
    • daß die Erfassungseinrichtung mindestens zwei Erfassungseinheiten aufweist;
    • daß die Erfassungseinheiten voneinander beabstandet angeordnet sind;
    • daß jede der Erfassungseinheiten aufweist:
      • mindestens ein mit der Fadenstange in Verbindung stehendes Biegeelement und
      • mindestens ein dem Biegeelement zugeordnetes Meßelement zum Erfassen der durch die Auslenkung der Fadenstange bestimmten Biegung des Biegeelements;
    • daß die Biegeelemente balken-, stab- oder stangenförmig ausgebildet sind;
    • daß die Fadenstange an einem Endbereich des Biegeelements angebracht ist;
    • daß das Biegeelement an einem Endbereich einen vorspringenden Abschnitt aufweist, an dem die Fadenstange angebracht ist;
    • daß die Biegung des Biegeelements im wesentlichen proportional zur Fadenkraft erfolgt;
    • daß das Meßelement ein magnetisches Meßelement ist;
    • daß das magnetische Meßelement mindestens einen Magneten und mindestens einen Hallsensor aufweist;
    • daß der Magnet ein Permanentmagnet ist;
    • daß der Permanentmagnet rechteckförmig ist;
    • daß das Material des Permanentmagneten auf Eisen, Neodym und Bor basiert;
    • daß der Magnet an einem Endbereich des Biegeelements angebracht ist;
    • daß der Magnet an demselbem Endbereich des Biegeelements wie die Fadenstange angebracht ist;
    • daß die Fadenstange und der Magnet auf voneinander abgewandten Seiten des Endbereichs des Biegeelements angebracht sind;
    • daß dem Hallsensor mindestens eine Verstärkungsschaltung zugeordnet ist;
    • daß bei hoher Fadenkraft ein Übersteuern der Verstärkungsschaltung erfolgt;
    • daß der Hallsensor auf einer Platine vorgesehen ist;
    • daß die Auswertemittel auf der Platine vorgesehen sind;
    • daß die Platine mit dem Biegeelement in Verbindung steht;
    • daß die Platine mit dem Endbereich des Biegeelements in Verbindung steht, der dem Endbereich des Biegeelements entgegengesetzt ist, an dem der Magnet angebracht ist;
    • daß zwischen dem Magneten und dem Hallsensor ein Luftspalt vorgesehen ist, dessen Größe durch die Biegung des Biegeelements bestimmt ist;
    • daß sich durch die Biegung des Biegeelements bestimmte Änderungen in der Größe des Luftspaltes im Bereich von etwa einigen wenigen Mikrometern bewegen;
    • daß das vom Hallsensor abgegebene elektrische Meßsignal in Form eines elektrischen Spannungssignals im wesentlichen direkt proportional zur magnetischen Feldstärke ist;
    • daß die Erfassungseinrichtung mindestens zwei Erfassungseinheiten aufweist;
    • daß jede der Erfassungseinheiten für die Abgabe elektrischer Meßsignale ausgelegt ist;
    • daß die Auswertemittel mindestens einen Summierer zum Aufsummieren der elektrischen Meßsignale aufweisen;
    • daß die Auswertemittel mindestens einen Analog-/Digitalwandler aufweisen;
    • daß die Auswertemittel als mindestens eine Verarbeitungseinheit ausgebildet sind;
    • daß die Verarbeitungseinheit als Mikroprozessor ausgebildet ist; und/oder
    • daß mindestens eine Anzeigeeinheit vorgesehen ist, mittels der das Vorliegen der Fehlfunktion und/oder die Art der Fehlfunktion anzeigbar ist.
    The stitch-forming machine according to the present invention can have various preferred embodiments which are characterized independently of one another by
    • that the thread rod has a circular cross section;
    • that the deflection of the thread rod is essentially proportional to the thread force;
    • that the thread rod is connected in its end regions to the detection device;
    • that the areas of the detection device facing the thread bar are provided essentially outside an embroidery head of the stitch-forming machine and the areas of the detection device facing away from the thread bar are essentially provided inside the embroidery head of the stitch-forming machine;
    • that the embroidery head has at least two upper threads;
    • that the upper threads differ in their nature, thickness, color, quality, tensile strength and / or strength;
    • that each of the upper threads is assigned a thread feeder;
    • that the upper thread is at least partially led around the thread rod, is passed through the thread feeder and is threaded into a sewing needle;
    • that the detection device has at least two detection units;
    • that the detection units are arranged at a distance from one another;
    • that each of the registration units has:
      • at least one bending element connected to the thread rod and
      • at least one measuring element assigned to the bending element for detecting the bending of the bending element determined by the deflection of the thread rod;
    • that the bending elements are bar, rod or rod-shaped;
    • that the thread rod is attached to an end portion of the bending element;
    • that the bending element has at one end portion a projecting portion to which the thread rod is attached;
    • that the bending of the bending element is essentially proportional to the thread force;
    • that the measuring element is a magnetic measuring element;
    • that the magnetic measuring element has at least one magnet and at least one Hall sensor;
    • that the magnet is a permanent magnet;
    • that the permanent magnet is rectangular;
    • that the material of the permanent magnet is based on iron, neodymium and boron;
    • that the magnet is attached to an end portion of the flexure;
    • that the magnet is attached to the same end region of the bending element as the thread rod;
    • that the thread rod and the magnet are mounted on opposite sides of the end region of the bending element;
    • that at least one amplification circuit is assigned to the Hall sensor;
    • that when the thread force is high, the amplification circuit is overdriven;
    • that the Hall sensor is provided on a circuit board;
    • that the evaluation means are provided on the board;
    • that the board is connected to the bending element;
    • that the board communicates with the end portion of the flexure that is opposite the end portion of the flexure to which the magnet is attached;
    • that an air gap is provided between the magnet and the Hall sensor, the size of which is determined by the bending of the bending element;
    • that certain changes in the size of the air gap are in the range of about a few micrometers due to the bending of the bending element;
    • that the electrical measurement signal emitted by the Hall sensor in the form of an electrical voltage signal is essentially directly proportional to the magnetic field strength;
    • that the detection device has at least two detection units;
    • that each of the detection units is designed for the delivery of electrical measurement signals;
    • that the evaluation means have at least one summer for summing the electrical measurement signals;
    • that the evaluation means have at least one analog / digital converter;
    • that the evaluation means are designed as at least one processing unit;
    • that the processing unit is designed as a microprocessor; and or
    • that at least one display unit is provided, by means of which the presence of the malfunction and / or the type of malfunction can be displayed.

    Das Verfahren gemäß der vorliegenden Erfindung kann verschiedene vorteilhafte Weiterbildungen aufweisen, die sich unabhängig voneinander dadurch auszeichnen,

    • daß ein erstes elektrisches Meßsignal von einer ersten Erfassungseinheit der Erfassungseinrichtung abgegeben wird und daß ein zweites elektrisches Meßsignal von einer zweiten Erfassungseinheit der Erfassungseinrichtung abgegeben wird;
    • daß das erste elektrische Meßsignal und das zweite elektrische Meßsignal zum elektrischen Signal aufsummiert werden;
    • daß das erste elektrische Meßsignal und das zweite elektrische Meßsignal vor dem Aufsummieren einer Analog-/Digitalumwandlung unterzogen werden;
    • daß das erste elektrische Meßsignal und das zweite elektrische Meßsignal in der Verarbeitungseinheit zu einem elektrischen Signal aufsummiert werden;
    • daß die jeweiligen Mittelwerte als arithmetische Mittelwerte oder als geometrische Mittelwerte gebildet werden;
    • daß die jeweiligen Mittelwerte durch Integrieren gebildet werden;
    • daß das elektrische Signal in zwei Zeitbereiche zeitlich unterteilt wird;
    • daß der für den ersten zeitlichen Bereich gebildete erste Mittelwert dem Überwachen des Oberfadens zugeordnet wird;
    • daß der für den ersten zeitlichen Bereich gebildete erste Mittelwert dem Vorgang des Ziehens des Oberfadens um eine für die stichbildende Maschine vorgesehene Spulenkapsel zugeordnet wird;
    • daß der für den zweiten zeitlichen Bereich gebildete zweite Mittelwert dem Überwachen des Unterfadens zugeordnet wird;
    • daß der für den zweiten zeitlichen Bereich gebildete zweite Mittelwert dem Vorgang des Festziehens der Verknotung durch einen für die stichbildende Maschine vorgesehenen Fadengeber zugeordnet wird;
    • daß folgende Zustände erkennbar sind:
      • es liegt keine Fehlfunktion vor;
      • es liegt eine Fehlfunktion des Oberfadens vor;
      • es liegt eine Fehlfunktion des Unterfadens vor; und
      • es liegt ein Fehlstich vor;
    • daß keine Fehlfunktion vorliegt, wenn der erste Mittelwert größer als der zugehörige erste Schwellenwert ist und wenn der zweite Mittelwert größer als der zugehörige zweite Schwellenwert ist;
    • daß eine Fehlfunktion des Oberfadens vorliegt, wenn der erste Mittelwert kleiner als der zugehörige erste Schwellenwert ist und wenn der zweite Mittelwert kleiner als der zugehörige zweite Schwellenwert ist;
    • daß eine Fehlfunktion des Unterfadens vorliegt, wenn der erste Mittelwert größer als der zugehörige erste Schwellenwert ist und wenn der zweite Mittelwert kleiner als der zugehörige zweite Schwellenwert ist;
    • daß eine Fehlfunktion des Unterfadens vorliegt, wenn die Bedingung erfüllt ist, daß der gebildete zweite Mittelwert kleiner als vier Fünftel des zuvor gebildeten zweiten Mittelwertes ist;
    • daß eine Fehlfunktion des Unterfadens vorliegt, wenn das Kriterium, daß der zweite Mittelwert kleiner als der zugehörige zweite Schwellenwert ist, und/oder wenn die Bedingung mindestens zweimal aufeinanderfolgend erfüllt wird;
    • daß ein Fehlstich vorliegt, wenn der erste Mittelwert kleiner als der zugehörige erste Schwellenwert ist und wenn der zweite Mittelwert größer als der erste Schwellenwert ist;
    • daß der erste Schwellenwert kleiner als der zweite Schwellenwert gewählt wird;
    • daß der erste Schwellenwert in etwa halb so groß wie der zweite Schwellenwert gewählt wird;
    • daß das erste elektrische Meßsignal und/oder das zweite elektrische Meßsignal durch einen Verstärkungsfaktor verstärkt werden;
    • daß der Verstärkungsfaktor so gewählt wird, daß bei geringer Fadenkraft das erste elektrische Meßsignal und/oder das zweite elektrische Meßsignal in einer zum Erkennen von Fehlfunktionen im Bereich des Fadens ausreichenden Größe vorliegt;
    • daß der erste Schwellenwert und/oder der zweite Schwellenwert bei geringer Fadenkraft vorgegeben werden;
    • daß die Häufigkeit des Auftretens von Fehlfunktionen berechnet wird;
    • daß die Häufigkeit des Auftretens von Fehlfunktionen angezeigt wird;
    • daß bei Erkennen einer Fehlfunktion die Art der Fehlfunktion angezeigt wird;
    • daß bei Erkennen einer Fehlfunktion des Oberfadens und/oder bei Erkennen einer Fehlfunktion des Unterfadens die stichbildende Maschine angehalten wird;
    • daß für jeden Faden ein jeweiliger oberer Grenzwert der Fadenkraft und ein jeweiliger unterer Grenzwert der Fadenkraft vorgegeben werden;
    • daß die Fadenkraft durch Ziehen am freien Ende des Fadens ermittelt wird;
    • daß die ermittelte Fadenkraft mit dem oberen Grenzwert der Fadenkraft und/oder mit dem unteren Grenzwert der Fadenkraft verglichen wird; und/oder
    • daß das Vorliegen einer Fadenkraft oberhalb des oberen Grenzwertes der Fadenkraft und/oder unterhalb des unteren Grenzwertes der Fadenkraft angezeigt wird.
    The method according to the present invention can have various advantageous developments which are distinguished independently of one another by
    • that a first electrical measurement signal is emitted by a first detection unit of the detection device and that a second electrical measurement signal is issued by a second detection unit of the detection device;
    • that the first electrical measurement signal and the second electrical measurement signal are added up to form the electrical signal;
    • that the first electrical measurement signal and the second electrical measurement signal are subjected to an analog / digital conversion before summation;
    • that the first electrical measurement signal and the second electrical measurement signal are summed up in the processing unit to form an electrical signal;
    • that the respective mean values are formed as arithmetic mean values or as geometric mean values;
    • that the respective mean values are formed by integrating;
    • that the electrical signal is divided into two time periods;
    • that the first mean value formed for the first time range is assigned to the monitoring of the upper thread;
    • that the first mean value formed for the first time range is assigned to the process of pulling the upper thread around a bobbin case provided for the stitch-forming machine;
    • that the second mean value formed for the second time range is assigned to the monitoring of the lower thread;
    • that the second mean value formed for the second time range is assigned to the process of tightening the knot by a thread feeder provided for the stitch-forming machine;
    • that the following conditions are recognizable:
      • there is no malfunction;
      • the upper thread is malfunctioning;
      • there is a malfunction of the lower thread; and
      • there is a skipped stitch;
    • that there is no malfunction if the first average is greater than the associated first threshold and if the second average is greater than the associated second threshold;
    • that the upper thread malfunctions when the first average is less than the associated first threshold and when the second average is less than the associated second threshold;
    • that the bobbin thread malfunctions when the first average is greater than the associated first threshold and when the second average is less than the associated second threshold;
    • that the lower thread malfunctions if the condition is met that the second mean formed is less than four fifths of the second mean previously formed;
    • that the bobbin thread malfunctions if the criterion that the second mean value is smaller than the associated second threshold value and / or if the condition is met at least twice in succession;
    • that a missing stitch is present when the first average is less than the associated first threshold and when the second average is greater than the first threshold;
    • that the first threshold is chosen to be less than the second threshold;
    • that the first threshold is chosen to be approximately half the size of the second threshold;
    • that the first electrical measurement signal and / or the second electrical measurement signal are amplified by an amplification factor;
    • that the amplification factor is selected such that the first electrical measurement signal and / or the second electrical measurement signal is of a size sufficient for detecting malfunctions in the area of the thread when the thread force is low;
    • that the first threshold value and / or the second threshold value are specified with a low thread force;
    • that the frequency of malfunction occurrence is calculated;
    • that the frequency of malfunction occurrence is displayed;
    • that the type of malfunction is displayed when a malfunction is detected;
    • that the stitch-forming machine is stopped when a malfunction of the upper thread and / or when a malfunction of the lower thread is detected;
    • that a respective upper limit value of the thread force and a respective lower limit value of the thread force are specified for each thread;
    • that the thread force is determined by pulling on the free end of the thread;
    • that the determined thread force is compared with the upper limit value of the thread force and / or with the lower limit value of the thread force; and or
    • that the presence of a thread force above the upper limit value of the thread force and / or below the lower limit value of the thread force is indicated.

    Weitere Ausgestaltungen, Merkmale und Vorteile der vorliegenden Erfindung werden nachstehend in der Zeichnung anhand der Figuren 1 bis 5 beschrieben, durch die in exemplarischer Form ein Ausführungsbeispiel der stichbildenden Maschine gemäß der vorliegenden Erfindung veranschaulicht ist. Further configurations, features and advantages of the present invention are hereinafter described in the Drawing described with reference to Figures 1 to 5, through the in an exemplary form Embodiment of the stitch-forming machine according to of the present invention.

    Es zeigt:

    Figur 1
    eine Ausführungsform einer stichbildenden Maschine gemäß der vorliegenden Erfindung;
    Figur 2
    eine Erfassungseinheit mit Platine der stichbildenden Maschine aus Figur 1;
    Figur 3
    ein vom Hallsensor der stichbildenden Maschine aus Figur 1 abgegebenes elektrisches Spannungssignal;
    Figur 4
    eine diagrammatische Darstellung des für den zweiten zeitlichen Bereich gebildeten zweiten Mittelwerts in Abhängigkeit von der Anzahl der Stiche; und
    Figur 5
    eine diagrammatische Darstellung des für den ersten zeitlichen Bereich gebildeten ersten Mittelwerts und des für den zweiten zeitlichen Bereich gebildeten zweiten Mittelwerts in Abhängigkeit von der Zeit.
    It shows:
    Figure 1
    an embodiment of a stitch-forming machine according to the present invention;
    Figure 2
    a detection unit with board of the stitch-forming machine of Figure 1;
    Figure 3
    an electrical voltage signal emitted by the Hall sensor of the stitch-forming machine from FIG. 1;
    Figure 4
    a diagrammatic representation of the second mean value formed for the second time range as a function of the number of stitches; and
    Figure 5
    a diagrammatic representation of the first mean value formed for the first time range and the second mean value formed for the second time range as a function of time.

    Gleiche oder ähnliche Bestandteile oder Merkmale der Erfindung sind in den Figuren 1 und 2 mit identischen Bezugszeichen versehen.Same or similar components or characteristics of the Invention are in Figures 1 and 2 with identical Provide reference numerals.

    In Figur 1 ist eine Ausführungsform einer stichbildenden Maschine in Form einer Stickmaschine gemäß der vorliegenden Erfindung gezeigt. Die stichbildende Maschine weist einen Stickkopf 1 auf, der mit den für die Erfindung wesentlichen Bestandteilen dargestellt ist. Der Stickkopf 1 verfügt über mehrere Fäden in Form von Oberfäden 4 mit unterschiedlichen Eigenschaften und Farben, wobei allerdings zu jedem Zeitpunkt mit nur einem Oberfaden 4 gestickt wird.In Figure 1 is an embodiment of a stitch-forming machine in the form of an embroidery machine according to the present invention. The stitch-forming machine has an embroidery head 1, of those essential to the invention Components is shown. The embroidery head 1 has several threads in the form of upper threads 4 with different properties and colors, whereby however with only one upper thread at all times 4 is embroidered.

    Stellvertretend für mehrere Fäden, die in einem bestimmten Moment nicht zum Einsatz kommen, ist in Figur 1 der Fadengeber 2 bezeichnet; zum Sticken ist in Figur 1 der Fadengeber 3 in Aktion. Die Oberfäden 4 sind um die Fadenstange 5 gelegt und dann zum Fadengeber 2, 3 geführt; anschließend sind die Oberfäden 4 in die Nähnadeln 7, 8 eingefädelt.Representing multiple threads in one certain moment is not used is in Figure 1 denotes the thread transmitter 2; is for embroidery in Figure 1 the thread feeder 3 in action. The upper threads 4 are placed around the thread rod 5 and then to Thread feeder 2, 3 guided; afterwards are the Upper threads 4 threaded into the sewing needles 7, 8.

    Wie aus Figur 1 des weiteren hervorgeht, ist die Fadenstange 5 an ihren beiden Enden in Biegeelementen 6 befestigt. Jedes der Biegeelemente 6 weist an seinem freien Ende eine Permanentmagneten 9 auf, wobei sich gegenüber dem Permanentmagneten 9 über einem Luftspalt ein Hallsensor 10 befindet, der proportional zur magnetischen Feldstärke ein elektrisches Spannungssignal abgibt.As can further be seen from FIG. 1, the Thread rod 5 at both ends in bending elements 6 attached. Each of the bending elements 6 instructs a permanent magnet 9 on its free end, with respect to the permanent magnet 9 over an air gap there is a Hall sensor 10 which proportional to the magnetic field strength emits electrical voltage signal.

    Der Hallsensor 10 ist mit der dazugehörigen Verstärkungsschaltung auf einer Platine 11 untergebracht, wobei das Biegeelement 6 auch an dieser Platine 11 befestigt ist, so daß der Luftspalt zwischen dem Permanentmagneten 9 und dem Hallsensor 10 eine eindeutig definierte Breite aufweist (vgl. Figur 2, in der eine Erfassungseinheit mit Platine 11 der stichbildenden Maschine aus Figur 1 schematisch dargestellt ist).The Hall sensor 10 is associated with the Amplification circuit on a circuit board 11 housed, the bending element 6 also this board 11 is attached so that the air gap between the permanent magnet 9 and the Hall sensor 10 has a clearly defined width (cf. Figure 2, in which a detection unit with board 11th the stitch-forming machine of Figure 1 schematically is shown).

    Durch die auf den Oberfaden 4 wirkende Fadenkraft wird der Luftspalt nun vergrößert. Da sich der Hallsensor 10 im Streufeld des Permanentmagneten 9 befindet, wird die am Hallsensor 10 gemessene magnetische Feldstärke geringer, wenn sich der Abstand des Hallsensors 10 zum Permanentmagneten 9 vergrößert. Hierbei ist eine Abstandsänderung von einigen wenigen Millimetern ausreichend, um ein auswertbares Signal zu erzeugen.By the thread force acting on the upper thread 4 the air gap is now enlarged. Since the Hall sensor 10 in the stray field of the permanent magnet 9 is located, the measured at the Hall sensor 10 magnetic field strength is lower if the Distance of the Hall sensor 10 to the permanent magnet 9 increased. Here is a change in distance of a few millimeters sufficient to get one generate evaluable signal.

    Die aus der Spannung des Oberfadens 4 resultierende, in der durch den umgelenkten Oberfaden 4 aufgespannten Ebene liegende Fadenkraft verformt über die Fadenstange 5 die beiden Biegeelemente 6. Die Kraftverteilung auf die Biegeelemente 6 hängt hierbei davon ab, in welcher Lage die Fadenkraft auf die Fadenstange 5 wirkt.The resulting from the tension of the upper thread 4, in the through the deflected upper thread 4 Thread force lying on the stretched plane deforms over the thread rod 5 the two bending elements 6. The Force distribution on the bending elements 6 depends on this depending on the position of the thread force on the Thread rod 5 acts.

    Demnach variiert die Kraft auf ein Biegeelement 6 mit der Lage des Arbeitsfadens. Die Summe der beiden Kräfte auf die Biegeelemente 6 ist hierbei jedoch gleich der doppelten Fadenkraft. Um die Fadenkraft in diesem Zusammenhang zu erfassen, werden die Signale der beiden Meßelemente 9, 10 summiert, wobei die Summierung der Signale in einem Mikroprozessor nach der Analog-/Digitalumwandlung der Signale erfolgt.Accordingly, the force on a bending element 6 also varies the position of the working thread. The sum of the two Forces on the bending elements 6 is however here equal to twice the thread force. To the thread force in to grasp this context are the signals of the two measuring elements 9, 10 summed, the The signals are summed in a microprocessor the analog / digital conversion of the signals takes place.

    Wie bereits vorstehend ausgeführt, wirkt auf die Fadenstange 5 abgesehen von einer geringen Reibung durch die gewählte Fadenführung die doppelte Fadenkraft, Durch diese hohe, zur Messung zur Verfügung stehende Kraft ist es möglich, die Federkonstante der Biegeelemente 6 hoch zu wählen. Wenn das Biegeelement 6 aus seiner Ruhelage abgelenkt und danach losgelassen wird, schwingt sein freies Ende mit dem Permanentmagneten 9 mit einer geringen Dämpfungskonstante um seine Ruhelage.As already stated above, acts on the Thread rod 5 apart from a low friction through the selected thread guide, double Thread force, due to this high, for measuring to Available force it is possible that Select spring constant of the bending elements 6 high. When the bending element 6 is deflected from its rest position and after being released, his free swing End with the permanent magnet 9 with a small Damping constant around its rest position.

    Um das Meßsignal nicht zu verfälschen, müßte die Eigenfrequenz des Biegeelements 6 wesentlich höher als der Frequenzbereich des Meßsignals liegen. Dies wird bei der vorliegenden Erfindung dadurch erreicht, daß die doppelte Fadenkraft als Meßkraft ausgenutzt wird und mithin das Biegeelement 6 steif ausgewählt werden kann.In order not to falsify the measurement signal, the Natural frequency of the bending element 6 is significantly higher than the frequency range of the measurement signal. This is achieved in the present invention by that the double thread force is used as a measuring force is selected and therefore the bending element 6 stiff can be.

    Im vorliegenden Ausführungsbeispiel der Figuren 1 und 2 beträgt die Eigenfrequenz, mit der die Meßelemente 9, 10 schwingen, ein Vielfaches der Nutzfrequenz bei der höchsten Drehzahl der stichbildenden Maschine, so daß die Eigenfrequenz des Meßsystems entweder durch eine elektrische Filterung oder durch eine angepaßte Signalverarbeitung unterdrückt werden kann.In the present embodiment of Figures 1 and 2 is the natural frequency with which the measuring elements 9, 10 vibrate, a multiple of the useful frequency the highest speed of the stitch-forming machine, so that the natural frequency of the measuring system either by an electrical filtering or by an adapted Signal processing can be suppressed.

    Figur 3 zeigt ein typisches, vom Hallsensor 10 der stichbildenden Maschine aus Figur 1 abgegebenes elektrisches Spannungssignal, wobei sowohl der Oberfaden 4 als auch der Unterfaden vorhanden ist. Das Spannungssignal, das in einem festen Verhältnis zur Maschinenwelle steht, zeigt zwei Maxima, wobei das erste Maximum entsteht, wenn der Oberfaden 4 um die Spulenkapsel gezogen wird; das zweite Maximum entsteht, wenn der Fadengeber 3 die Verknotung festzieht.FIG. 3 shows a typical of the Hall sensor 10 stitch-forming machine from Figure 1 electrical voltage signal, with both the Upper thread 4 and the lower thread is present. The voltage signal in a fixed ratio to the machine shaft shows two maxima, whereby the first maximum occurs when the upper thread 4 around the bobbin case is pulled; the second maximum arises when the thread take-up 3 knots tightens.

    Hieraus folgt, daß weder das erste Maximum noch das zweite Maximum entsteht, wenn der Oberfaden 4 gebrochen oder sein Vorrat zu Ende gegangen ist. Wenn der Unterfaden bricht bzw. reißt oder sein Vorrat zu Ende geht, wird das zweite Maximum des Spannungssignals kleiner, während das erste Maximum hiervon unbeeinflußt bleibt.It follows that neither the first maximum nor the second maximum occurs when the upper thread 4 broken or out of stock. If the bobbin thread breaks or tears or its stock closes The second maximum of the Voltage signal smaller while the first maximum remains unaffected by this.

    Bei einem sogenannten Fehlstich sind zwar sowohl der Oberfaden 4 als auch der Unterfaden vorhanden, jedoch findet keine Verknotung statt, weil der Greifer die Schlinge des Oberfadens nicht greifen konnte. Die Häufigkeit dieses Zustands, der unter verschiedenen Einflüssen in der stichbildenden Maschine entsteht, stellt insofern ein Gütekriterium dar, als ein seltenes Auftreten von Fehlstichen für die Güte der stichbildenden Maschine spricht. Hierbei entsteht bei einem Fehlstich das erste Maximum nicht, wohingegen das zweite Maximum in der Amplitude im Vergleich zur normalen Stichbildung wesentlich kleiner ist.In a so-called skipped stitch, both are Upper thread 4 and the lower thread are present, however there is no knotting because the gripper Loop of the upper thread could not grip. The Frequency of this condition, which varies among Influences arise in the stitch-forming machine, represents a quality criterion insofar as a rare occurrence of skipped stitches for the quality of the stitch-forming machine speaks. This creates at the first maximum in a skipped stitch, whereas the second maximum in amplitude compared to normal stitch formation is much smaller.

    Mithin können demnach die folgenden verschiedenen Zustände vorliegen:

    • es liegt keine Fehlfunktion FK vor;
    • es liegt eine Fehlfunktion FO des Oberfadens 4 vor;
    • es liegt eine Fehlfunktion FU des Unterfadens vor; und
    • es liegt ein Fehlstich FS vor.
    The following different states can therefore exist:
    • there is no malfunction FK;
    • there is a malfunction FO of the upper thread 4;
    • there is a malfunction FU of the lower thread; and
    • there is a miss stitch FS.

    Um diese verschiedenen Zustände zu erkennen, wird das in Figur 3 dargestellte, vom Hallsensor 10 der stichbildenden Maschine aus Figur 1 abgegebene elektrische Spannungssignal in zwei zeitliche Bereiche eingeteilt bzw. unterteilt, wobei die Einteilung bzw. Unterteilung durch ein Winkelsignal von der Hauptwelle durchgeführt wird. Im ersten Bereich des Spannungssignals, der sich bis A erstreckt, wird der Oberfaden 4 überwacht bzw. kontrolliert. Im zweiten Bereich des Spannungssignals, der sich von A bis E erstreckt, wird der Unterfaden überwacht bzw. kontrolliert.In order to recognize these different states, the electrical voltage signal shown in FIG. 3, which is emitted by the Hall sensor 10 of the stitch-forming machine from FIG. 1, is divided or divided into two time ranges, the division or division being carried out by an angle signal from the main shaft. The upper thread 4 is monitored or controlled in the first area of the tension signal, which extends to  A. In the second area of the tension signal, which extends from  A to  E , the lower thread is monitored or checked.

    Anstelle nun den jeweiligen Maximalwert innerhalb der beiden Abschnitte einer Schwellenwertoperation zu unterziehen, werden zunächst arithmetische Mittelwerte M1 und M2 gebildet (vgl. Figur 4, die eine diagrammatische Darstellung des für den zweiten zeitlichen Bereich gebildeten zweiten Mittelwerts M2 in Abhängigkeit von der Anzahl der Stiche zeigt, sowie Figur 5, die eine diagrammatische Darstellung des für den ersten zeitlichen Bereich gebildeten ersten Mittelwerts M1 und des für den zweiten zeitlichen Bereich gebildeten zweiten Mittelwerts M2 in Abhängigkeit von der Zeit zeigt).Instead of the respective maximum value within the both sections of a threshold operation undergo arithmetic first Mean values M1 and M2 are formed (see FIG. 4, the a diagrammatic representation of the for the second temporal area formed second average M2 depending on the number of stitches shows and Figure 5, which is a diagrammatic representation the one formed for the first time range first average M1 and that for the second temporal area formed second average M2 depending on the time shows).

    Diese Werte an den Winkelpunkten A (erster Mittelwert M1) und E (zweiter Mittelwert M2) stellen dann die Entscheidungsgrößen dar. Diese Mittelwerte M1 und M2 sind relativ unabhängig von der Drehzahl der stichbildenden Maschine und werden von den Eigenschwingungen des Meßsystems kaum beeinflußt, weil diese Mittelwerte M1 und M2 durch Integrieren ermittelt werden. Vor diesem Hintergrund liefern Schwingungen mit höheren Frequenzen nur einen ausgesprochen geringen Beitrag zu den Mittelwerten M1 und M2 des Spannungssignals.These values at the angle points  A (first average M1) and  E (second average M2) then represent the decision variables. These average values M1 and M2 are relatively independent of the speed of the stitch-forming machine and are hardly influenced by the natural vibrations of the measuring system, because these mean values M1 and M2 are determined by integrating. Against this background, vibrations with higher frequencies only make an extremely small contribution to the mean values M1 and M2 of the voltage signal.

    Der Zustand, daß keine Fehlfunktion FK vorliegt, kann daran erkannt werden, daß sowohl der erste Mittelwert M1 über dem entsprechenden Schwellenwert S1 als auch der zweite Mittelwert M2 über dem entsprechenden Schwellenwert S2 liegt.The state that there is no malfunction FK can be recognized by the fact that both the first mean M1 above the corresponding threshold S1 as well the second mean M2 above the corresponding one Threshold S2 lies.

    Der Zustand, daß eine Fehlfunktion FO des Oberfadens 4 vorliegt, kann daran erkannt werden, daß sowohl der erste Mittelwert M1 unter dem ihm zugeordneten Schwellenwert S1 als auch der zweite Mittelwert M2 unter dem ihm zugeordneten Schwellenwert S2 liegt. The condition that a malfunction FO of the upper thread 4 is present, it can be recognized that both the first mean M1 below that assigned to it Threshold value S1 as well as the second mean value M2 is below the threshold value S2 assigned to it.

    Der Zustand, daß eine Fehlfunktion FU des Unterfadens vorliegt, kann anhand des Mittelwerts M2 erkannt werden. Wenn der Mittelwert M2 unter dem zugehörigen Schwellenwert S2 liegt, muß dies nicht unbedingt durch eine Fehlfunktion FU des Unterfadens bedingt sein, sondern kann auch durch einen Fehlstich FS verursacht sein. Um eine diesbezügliche Entscheidung treffen zu können, wird die Änderung des Spannungssignals über mehrere Stiche hinweg verfolgt. Wenn der Vorrat an Unterfaden im Begriffe ist, zu Ende zu gehen, zeigt das Signal des Mittelwerts M2 den in Figur 4 angegebenen Verlauf:The state that a malfunction FU of the lower thread is present, can be identified from the mean value M2 become. If the mean M2 is below the associated Threshold S2 is not necessarily due to a malfunction FU of the lower thread but can also be due to a miss stitch FS be caused. To make a decision in this regard to be able to meet, will change the Voltage signal tracked across multiple stitches. If the supply of bobbin thread is about to go Going to the end shows the signal of the mean M2 the course indicated in Figure 4:

    Bei Stich n erfolgt die Verknotung nicht mehr, weil kein Unterfaden mehr vorhanden ist. Das Signal des Mittelwerts M2 bei Stich n-1 ist zwar größer als der zugeordnete Schwellenwert S2, jedoch kleiner als das Signal des Mittelwerts M2 bei Stich n-2. Wenn der Schwellenwert S2 bei Stich n unterschritten wird, betrachtet man den Gradienten des Signals des Mittelwerts M2 in den letzten drei Stadien.With stitch n, the knot no longer occurs because there is no longer a bobbin thread. The signal of the Mean M2 at stitch n-1 is larger than that assigned threshold S2, but less than that Average M2 signal at stitch n-2. If the Falling below threshold S2 at stitch n, consider the gradient of the signal of the Mean M2 in the last three stages.

    Bei einem Signalverlauf, wie er in Figur 4 abgebildet ist, ist der Vorrat an Unterfaden zu Ende gegangen. Wenn der Unterfaden bricht oder reißt, bleibt der Mittelwert M2 über mehrere Stiche hinweg unter seinem Schwellenwert S2, ohne zuvor eine abnehmende Tendenz in der Signalhöhe in Form eines negativen Gradienten zu zeigen. In einem derartigen Fall kann beispielsweise nach drei Stichen die Entscheidung getroffen werden.With a signal curve as shown in FIG. 4 the supply of bobbin thread has run out. If the bobbin thread breaks or breaks, it stays Mean M2 over several stitches below his Threshold S2 without a decreasing trend beforehand in the signal level in the form of a negative gradient to show. In such a case for example, the decision after three tricks to be hit.

    Der Zustand schließlich, daß ein Fehlstich FS vorliegt (in Figur 5 zum Zeitpunkt T), kann daran erkannt werden, daß der erste Mittelwert M1 unter dem entsprechenden Schwellenwert S1 liegt, wohingegen der zweite Mittelwert M2 über diesem Schwellenwert S1 liegt.Finally, the condition that a miss stitch FS is present (in FIG. 5 at time T), can be done can be recognized that the first mean M1 below the corresponding threshold value S1, whereas the second mean M2 above this threshold S1 lies.

    Dieser erste Schwellenwert S1 ist niedriger als der zweite Schwellenwert S2 gewählt (vgl. Figur 5), wobei der erste Schwellenwert S1 in etwa halb so groß wie der zweite Schwellenwert S2 für das Signal des Mittelwerts M2 bei der Unterfadenerkennung ist.This first threshold S1 is lower than that second threshold value S2 selected (see FIG. 5), where the first threshold S1 is approximately half as large the second threshold value S2 for the signal of the Mean M2 in the bobbin thread detection.

    Der durch die Verstärkungsschaltung bedingte Verstärkungsfaktor ist so eingestellt, daß ein ausreichender Spannungspegel bei minimaler Fadenkraft vorliegt. Der erste Schwellenwert S1 und der zweite Schwellenwert S2 werden dann bei dieser Fadenkraft bzw. bei dieser Fadenspannung festgelegt. Zu ergänzen ist in diesem Zusammenhang, daß die Verstärkungsschaltung bei sehr hoher Fadenkraft übersteuert werden kann. Hierdurch wird jedoch die Arbeitsweise des Gesamtsystems in keiner Form beeinträchtigt, weil die Signale beim Auftreten von Fehlern ohnehin schwächer werden.The one caused by the amplification circuit Gain is set so that a sufficient tension level with minimal thread force is present. The first threshold S1 and the second Threshold S2 are then at this thread force or fixed at this thread tension. To complete in this context is that the Gain circuit with very high thread force can be overridden. This will, however Operation of the overall system in no form impaired because the signals when Errors are getting weaker anyway.

    Da in der beschriebenen Vorrichtung die Fadenkraft gemessen wird, bestünde die Möglichkeit, dem Bediener der stichbildenden Maschine bei der Fadenkrafteinstellung die Fadenkraft anzuzeigen, woraufhin der Bediener dann die geforderte Kraft einstellen könnte.Since the thread force in the described device is measured, there would be the possibility for the operator the stitch-forming machine at the Thread force setting to display the thread force whereupon the operator then applies the required force could set.

    Eine weitaus effektivere Variante besteht jedoch darin, die Fadenkraft mit einem unteren Grenzwert und mit einem oberen Grenzwert zu vergleichen und eine Anzeige vorzusehen, wenn die Fadenkraft nicht im vorgesehenen Bereich zwischen dem unteren Grenzwert und dem oberen Grenzwert liegt.However, there is a far more effective variant therein the thread force with a lower limit and to compare with an upper limit and a Provide indication when the thread force is not in the provided range between the lower limit and the upper limit.

    Der untere Grenzwert und der obere Grenzwert werden in der Einstellphase musterabhängig von der Zentralsteuerung an die Stickköpfe 1 mitgeteilt; hierbei können innerhalb eines Stickkopfes 1 die Fäden 4 in Abhängigkeit von der Beschaffenheit und von der Sorte verschiedene untere und/oder obere Grenzwerte aufweisen.The lower limit and the upper limit will be depending on the pattern in the setting phase Central control communicated to the embroidery heads 1; Here, the 1 within an embroidery head Threads 4 depending on the nature and different lower and / or upper types Have limit values.

    Claims (72)

    1. Stitch-forming machine, in particular embroidery machine, sewing machine or sewing plant, with at least one thread for embroidering or sawing, to be precise with at least one over-thread (4) and with at least one under-thread, and with a device for the detection of malfunctions (FO, FU, FS) in the region of the thread, characterized in that the device has at least one thread rod (5), by means of which the over-thread (4) is deflected, in that the thread rod (5) is capable of being deflected out of the non-loaded initial position, counter to a return force, in the direction of a thread force resulting from the tension of the over-thread (4) and lying in the plane spanned by the deflected over-thread (4), in that the thread rod (5) is assigned at least one detection means for detecting the deflection of the thread rod (5) which has taken place due to the thread force, and in that evaluation means are provided, which have
      at least one mean-value former for the formation of in each case at least one mean value (M1, M2) for time segments, formed by time subdivision, of at least one electrical signal emitted by the detection means, and
      at least one comparator for comparing the respective mean values (M1, M2) with in each case predetermined threshold values (S1, S2).
    2. Stitch-forming machine according to Claim 1, characterized in that the thread rod (5) has a circular cross section.
    3. Stitch-forming machine according to Claim 1 or 2, characterized in that the deflection of the thread rod (5) is essentially proportional to the thread force.
    4. Stitch-forming machine according to at least one of Claims 1 to 3, characterized in that the thread rod (5) is connected in its end regions to the detection means.
    5. Stitch-forming machine according to at least one of Claims 1 to 4, characterized in that the regions of the detection means which face the thread rod (5) are provided essentially outside an embroidery head (1) of the stitch-forming machine and the regions of the detection means which face away from the thread rod (5) are provided essentially inside the embroidery head (1) of the stitch-forming machine.
    6. Stitch-forming machine according to at least one of Claims 1 to 5, characterized in that the embroidery head (1) has at least two over-threads (4).
    7. Stitch-forming machine according to Claim 6, characterized in that the over-threads (4) differ from one another in their nature, thickness, colour, quality, tearing resistance and/or strength.
    8. Stitch-forming machine according to Claim 6 or 7, characterized in that each of the over-threads (4) is assigned a thread take-up lever (2, 3).
    9. Stitch-forming machine according to Claim 8, characterized in that the over-thread (4) is guided at least partially around the thread rod (5), is guided through the thread take-up lever (2, 3) and is threaded into a sewing needle (7, 8).
    10. Stitch-forming machine according to at least one of Claims 1 to 9, characterized in that the detention means has at least two detection units.
    11. Stitch-forming machine according to Claim 10, characterized in that the detection units are arranged at a distance from one another.
    12. Stitch-forming machine according to Claim 10 or 11, characterized in that each of the detection units has:
      at least one bending element (6) connected to the thread rod (5), and
      at least one measuring element (9, 10), assigned to the bending element (6), for detecting the bending of the bending element (6) determined by the deflection of the thread rod (5).
    13. Stitch-forming machine according to Claim 12, characterized in that the bending elements (6) are of beam-shaped, bar-shaped or rod-shaped design.
    14. Stitch-forming machine according to Claim 12 or 13, characzerized in than the thread rod (5) is mounted at one end region of the bending element (6).
    15. Stitch-forming machine according to Claim 14, characterized in that the bending element (6) has at one end region a projecting portion on which the thread rod (5) is mounted.
    16. Stitch-forming machine according to at least one of Claims 12 to 15, characterized in chat the bending of the bending element (6) takes place essentially proportionally to the thread force.
    17. stitch-forming machine according to at least one of Claims 12 to 16, characterized in that the measuring element (9, 10) is a magnetic measuring element.
    18. Stitch-forming machine according to Claim 17, characterized in that the magnetic measuring element has at least one magnet (9) and at least one Hall sensor (10).
    19. Stitch-forming machine according to Claim 18, characterized in that the magnet (9) is a permanent magnet.
    20. Stitch-forming machine according to Claim 19, characterized in that the permanent magnet is rectangular.
    21. Stitch-forming machine according to Claim 19 or 20, characterized in that the material of the permanent magnet is based on iron, neodymium and boron.
    22. Stitch-forming machine according to at least one of Claims 18 to 21, characterized in chat the magnet (9) is mounted on one end region of the bending element (6).
    23. Stitch-forming machine according to claim 14 or 15 and according to Claim 22, characterized in that the magnet (9) is mounted on the same end region of the bending element (6) as the thread rod (5).
    24. Stitch-forming machine according to Claim 23, characterized in that the thread rod (5) and the magnet (9) are mounted on sides of the end region of the bending element (6) which face away from one another.
    25. Stitch-forming machine according to at least one of Claims 18 to 24, characterized in that the Hall sensor (10) is assigned at least one amplifying circuit.
    26. Stitch-forming machine according to Claim 25, characterized in that, in the case of a high thread force, an overdrive of the amplifying circuit takes place.
    27. Stitch-forming machine according to at least one of Claims 18 to 26, characterized in that the Hall sensor (10) is provided on a board (11).
    28. Stitch-forming machine according to Claim 27, characterized in chat the evaluation means are provided on the board (11).
    29. Stitch-forming machine according to Claim 27 or 28, characterized in that the board (11) is connected to the bending element (6).
    30. Stitch-forming machine according to at least one of Claims 22 to 24 and according to Claim 29, characterized in that the board (11) is connected to the end region of the bending element (6) which is opposite the end region of the bending element (6) on which the magnet (9) is mounted.
    31. Stitch-forming machine according to at least one of Claims 18 to 30, characterized in that between the magnet (9) and the Hall sensor (10) is provided an air gap, the size of which is determined by the bending of the bending element (6).
    32. Stitch-forming machine according to Claim 31, characterized in that changes in the size of the air gap which are determined by the bending of the bending element (6) move within the range of about a few micrometers.
    33. Stitch-forming machine according to at least one of Claims 18 to 32, characterised in that the electrical measurement signal emitted by the Hall sensor (10), in the form of an electrical voltage signal, is essentially directly proportional to the magnetic field strength.
    34. Stitch-forming machine according to at least one of Claims 2 to 33, characterized in that the detection means has at least two detection units.
    35. Stitch-forming machine according to Claim 34, characterized in that each of the detection units is designed for the emission of electrical measurement signals.
    36. Stitch-forming machine according to Claim 35, characterized in that the evaluation means have at least one summer for summing up the electrical measurement signals.
    37. Stitch-forming machine according to at least one of Claims 1 to 36, characterized in that the evaluation means have at least one analogue/digital converter.
    38. Stitch-forming machine according to at least one of Claims 1 to 37, characterized in that the evaluation means are designed as at least one processing unit.
    39. Stitch-forming machine according to Claim 38, characterized in that the processing unit is designed as a microprocessor.
    40. Stitch-forming machine according to at least one of Claims 1 co 39, characterized in that at least one indicator unit is provided, by means of which the presence of the malfunction (FO, FU, FS) and/or the type of malfunction (FO, FU, FS) can be indicated.
    41. Method for the detection of malfunctions (FO, FU, FS) in the region of at least one thread for embroidering or sewing, to be precise at least one over-thread (4) and/or at least one under-thread, of a stitch-forming machine, in particular of an embroidery machine, a sewing machine or a sewing plant, according to at lest one of Claims 1 to 40, characterized by the following steps:
      a) at least one electrical signal is emitted by at least one detection means,
      b) in each case at least one mean value (M1, M2) is formed for time segments of the electrical Signal which are formed by time subdivision, and
      c) the presence of a malfunction (FO, FU, FS) and/or the type of malfunction (FO, FU, FS) is detected by the comparison of the respective mean values (M1, M2) with in each case predetermined threshold values (S1, S2).
    42. Method according to Claim 41, characterized in that a first electrical measurement signal is emitted by a first detection unit of the detection means, and in that a second electrical measurement signal is emitted by a second detection unit of the detection means.
    43. Method according to claim 42, characterized in that the first electrical measurement signal and the second electrical measurement signal are summed up to form the electrical signal.
    44. Method according to Claim 43, characterized in that the first electrical measurement signal and the second electrical measurement signal are subjected to analogue-digital conversion before being summed up.
    45. Method according to Claim 43 or 44, characterized in that the first electrical measurement signal and the second electrical measurement signal are summed up in the processing unit to form an electrical signal.
    46. Method according to at least one of Claims 41 to 45, characterized in that the respective mean values (M1, M2) are formed as arithmetic mean values or as geometric mean values.
    47. Method according to at least one of Claims 41 to 46, characterized in that the respective mean values (M1, M2) are formed by integration.
    48. Method according to at least one of Claims 41 to 47, characterized in that the electrical signal is time-subdivided into two time segments.
    49. Method according to Claim 48, characterized in that the first mean value (M1) formed for the first time segment is assigned to the monitoring of the over-thread (4).
    50. Method according to Claim 49, characterized in that the first mean value (M1) formed for the first time segment is assigned to the operation of drawing the over-thread (4) around a bobbin case provided with a stitch-forming machine.
    51. Method according to at least one of Claims 48 to 50, characterized in that the second mean value (M2) formed for the second time segment is assigned to the monitoring of the under-thread.
    52. Method according to Claim 51, characterized in that the second mean value (M2) formed for the second time segment is assigned to the operation of tightening the knotting by a thread take-up lever (2, 3) provided for the stitch-forming machine.
    53. Method according to at least one of Claims 41 to 52, characterized in that the following states can be detected:
      there is no malfunction (FK);
      there is a malfunction (FO) of the over-thread (4);
      there is a malfunction (FU) of the under-thread; and
      there is a false stitch (FS).
    54. Method according to Claim 53, characterized in that there is no malfunction (FK) when the first mean value (M1) is higher than the associated first threshold value (S1) and when the second mean value (M2) is higher than the associated second threshold value (S2).
    55. Method according to Claim 53 or 54, characterized in that there is a malfunction (FO) of the over-thread (4) when the first mean value (M1) is lower than the associated first threshold value (S1) and when the second mean value (M2) is lower than the associated second threshold value (S2).
    56. Method according to at least one of Claims 53 to 55, characterised in that there is a malfunction (FU) of the under-thread when the first mean value (M1) is higher than the associated first threshold value (S1) and when the second mean value (M2) is lower than the associated second threshold value (S2).
    57. Method according to Claim 56, characterized in that there is a malfunction (FU) of the under-thread when the condition that the second mean value (M2) formed is lower than four fifths of the previously formed second mean value (M2) is fulfilled.
    58. Method according to claim 56 or 57, characterized in that there is a malfunction (FU) of the under-thread when the criterion that the second mean value (M2) is lower than the associated second threshold value (S2) and/or when the condition is fulfilled at least twice in succession.
    59. Method according to at least one of Claims 53 to 58, characterized in that a false stitch (FS) is present when the first mean value (M1) is lower than the associated first threshold value (S1) and when the second mean value (M2) is higher than the first threshold value (S1).
    60. Method according to at least one of Claims 41 to 59, characterized in that the first threshold value (S1) is selected Sower than the second threshold value (S2).
    61. Method according to Claim 60, characterized in that the first threshold value (S1) is selected approximately half as high as the second threshold value (S2).
    62. Method according to at least one of Claims 41 to 61, characterized in that the first electrical measurement signal and/or the second electrical measurement signal are amplified by means of an amplification factor.
    63. Method according to Claim 62, characterized in that the amplification factor is selected such that, in the case of a low thread force, the first electrical measurement signal and/or the second electrical measurement signal is of a size sufficient for the detection of malfunctions (FO, FU, FS) in the region of the thread.
    64. Method according to at least one of Claims 41 to 63, characterised in that the first threshold value (S1) and/or the second threshold value (S2) are predetermined in the case of a low thread force.
    65. Method according to at least one of Claims 41 to 64, characterized in that the frequency of the occurrence of malfunctions (FO, FU, FS) is calculated.
    66. Method according to at as one of Claims 41 to 65, characterized in that the frequency of the occurrence of malfunctions (FO, FU, FS) is indicated.
    67. Method according to at least one of Claims 41 to 66, characterized in that, in the case of the detection of a malfunction (FO, FU, FS), the type of malfunction (FO, FU, FS) is indicated.
    68. Method according to at least one of Claims 41 to 67, characterized in that, in the case of the detection of a malfunction (FO) of the over-thread (4) and/or in the case of the detection of a malfunction (FU) of the under-thread, the stitch-forming machine is stopped.
    69. Method according to at least one of Claims 41 to 68, characterised in that a respective upper limit value of the thread force and a respective lower limit value of the thread force are predetermined for each thread.
    70. Method according to Claim 69, characterized in that the thread force is determined by a pull on the free end of the thread.
    71. Method according to Claim 70, characterized in that the thread force determined is compared with the upper limit value of the thread force and/or with the lower limit value of the thread force.
    72. Method according to Claim 71, characterized in that the presence of a thread force above the upper limit value of the thread force and/or below the lower limit value of the thread force is indicated.
    EP99961064A 1998-12-08 1999-12-08 Stitch-forming machine and method for detecting malfunctions Expired - Lifetime EP1100987B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19856620A DE19856620A1 (en) 1998-12-08 1998-12-08 Stitch-forming machine and method for detecting malfunctions
    DE19856620 1998-12-08
    PCT/EP1999/009657 WO2000034563A1 (en) 1998-12-08 1999-12-08 Stitch-forming machine and method for detecting malfunctions

    Publications (2)

    Publication Number Publication Date
    EP1100987A1 EP1100987A1 (en) 2001-05-23
    EP1100987B1 true EP1100987B1 (en) 2003-03-19

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    EP (1) EP1100987B1 (en)
    AT (1) ATE234954T1 (en)
    DE (2) DE19856620A1 (en)
    WO (1) WO2000034563A1 (en)

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP4732598B2 (en) * 2001-01-26 2011-07-27 日本電波株式会社 Multi-color embroidery sewing machine thread breakage detector
    DE10130346A1 (en) * 2001-06-27 2003-01-09 Zsk Stickmasch Gmbh Tension measurement for upper thread on multi-needle embroidery or sewing machine, involves a sensor measuring the force exerted on thread diversion guide
    EP1571248A1 (en) * 2004-03-03 2005-09-07 Dürkopp Adler Aktiengesellschaft Sewing machine with needle thread control system
    CN103046255A (en) * 2012-12-31 2013-04-17 浙江凯泽路亚绣花机有限责任公司 Broken thread sensing mechanism of embroidery machine
    CN110923978B (en) * 2019-11-27 2021-08-13 福建睿能科技股份有限公司 Embroidery machine and thread breakage detection method
    CN114575069B (en) * 2022-03-31 2023-04-11 浙江小轩窗家居股份有限公司 High-speed full-automatic embroidery machine

    Family Cites Families (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE2606035C3 (en) * 1976-02-14 1979-12-20 Optilon W. Erich Heilmann Gmbh, Cham (Schweiz) Device for measuring the thread tension during a sewing operation
    US4170951A (en) * 1978-12-14 1979-10-16 The Singer Company Skipped stitch detection system
    SE444960B (en) * 1984-11-28 1986-05-20 Rydborn S A O DEVICE FOR MONITORING ONE OR MORE THREADS IN A SEWING MACHINE
    DE3839733C2 (en) * 1988-11-24 1993-12-09 Pfaff Ag G M Stitch-forming machine with a sensor
    SE465274B (en) * 1989-04-27 1991-08-19 Rydborn S A O DEVICE FOR WIRE BREAK INDICATION
    DE4030420A1 (en) * 1990-09-26 1992-04-02 Pfaff Ag G M METHOD AND ARRANGEMENT FOR DETECTING MISSING STITCHES IN THE OPERATION OF A SEWING MACHINE

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    DE59904647D1 (en) 2003-04-24
    EP1100987A1 (en) 2001-05-23
    WO2000034563A1 (en) 2000-06-15
    DE19856620A1 (en) 2000-06-15
    ATE234954T1 (en) 2003-04-15

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