EP2550387B1 - Two-thread lock stitch sewing machine or multi-head sewing machine with rotating shuttle - Google Patents

Two-thread lock stitch sewing machine or multi-head sewing machine with rotating shuttle Download PDF

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Publication number
EP2550387B1
EP2550387B1 EP11712469.3A EP11712469A EP2550387B1 EP 2550387 B1 EP2550387 B1 EP 2550387B1 EP 11712469 A EP11712469 A EP 11712469A EP 2550387 B1 EP2550387 B1 EP 2550387B1
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EP
European Patent Office
Prior art keywords
thread
needle
embroidery
head
gripper
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EP11712469.3A
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German (de)
French (fr)
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EP2550387A2 (en
Inventor
Gottlieb Schmidt
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Zoje Europe GmbH
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Zoje Europe GmbH
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D05B19/02—Sewing machines having electronic memory or microprocessor control unit
    • D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • 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

Definitions

  • the invention relates to single-head or multi-head embroidery machines with stitch imaging tools which are each formed by a needle cooperating with a lockstitch gripper for producing stitches, and have a feed device for achieving relative movements between the embroidery bottom and the stitch pattern tools.
  • the lockstitch gripper which is predominantly used here, is a revolving gripper which executes two full revolutions per stitching period, as it is used a hundred thousandfold in sewing machines as a "standard gripper” and has also proven itself very well here.
  • This lockstitch gripper requires a certain size of the thread tension for the stitch formation, in particular for the Sticheinzug.
  • sewing seam essentially represents a connecting or fastening seam with which usually two or more parts are firmly connected to each other
  • the embroidered seam represents an embroidery (ornamental seam) applied to the embroidery floor, which has no forces to transmit.
  • the strength of the fastening seam is thereby achieved that the fallen from the gripper thread loop is pulled by the thread lever with relatively large force in the direction of the top of the fabric, so that the knotting of needle and hook thread comes to rest in the middle to be sewn fabric layers. Accordingly, the thread force of the looper thread is to be measured.
  • a sewing machine is described with a driven by a main shaft needle bar and with a mechanically independent of the main shaft drive motor which drives a looper of the sewing machine.
  • the drive of the main shaft and the drive motor of the loop taker are synchronized with each other, but are not mechanically connected to each other in operative connection. Due to certain conditions of use, such sewing machines may experience synchronization discrepancies.
  • the the DE 197 51 083 A1 The underlying invention is intended to prevent this synchronization discrepancy.
  • sensors are provided with which state information of the main shaft, the sewing motor, the loop taker and the loop taker drive motor are detected.
  • a speed correction is determined on the basis of the determined state information, by which a synchronization of the main shaft and the loop taker can be achieved.
  • a sewing machine in which a separate drive is provided for a plurality of different driven components of the sewing machine, for example needle bar, gripper, presser foot, transport means or thread tensioning device.
  • each drive movement should be generated, which is independent of drive movements of the other drives.
  • a substantial adjustability of the sewing machine to different applications should be possible, for example, to be able to set the sewing machine to different materials to be processed, number of sewing material layers to be sewn together and the like.
  • the invention is therefore based on the object to provide a solution that makes it possible to keep the minimum thread tension in the desired much lower range in embroidery machines with lockstitch circular grippers.
  • the invention is based on the recognition that at lockstitch gripper embroidery machines, the stitch formation on the one hand and the feed movement of the embroidery on the other hand at least partially overlap such that the advancing movement of the embroidery already begins when the stitching is not complete is completed, ie the needle thread is not completely retracted by the thread lever.
  • Fig. 1 the front part 1 of a conventional embroidery head is shown in sectional view, which has a lockstitch gripper 2, a table top 3, and a throat plate 4.
  • On the table top 3 is the freely movable in two axes embroidery frame 5, in which the embroidery bottom is clamped.
  • the lockstitch gripper 2 is of conventional design and has a bobbin case carrier 6 for receiving a bobbin case 7.
  • the bobbin thread supply receiving coil is rotatably mounted.
  • the cooperating with the lockstitch gripper 2 and a needle 8-bearing needle bar 9 is vertical in a base frame 10 movably received and is driven in a conventional manner by a driver 11, which transmits the drive movement of the needle drive to the needle bar 9.
  • a hold-down 12 is further provided per embroidery thread, which is arranged displaceably on the needle bar 9 and is driven by a driver 13.
  • driven thread lever 14 is arranged, which is pivotally mounted on an axis 15, which in turn is received in the base frame 10.
  • the embroidery head in a known manner adjustable yarn brake 16 which is fixedly attached to the front part 1.
  • the rear part of the embroidery head not shown is fixedly connected to the machine frame and carries the drives for the needle bar 9, the hold-down 12 and the thread lever 14.
  • the rear part of the embroidery head is also connected via a straight guide, not shown, with the front part 1, so that it can be moved within a vertical plane in the direction of the flight of the existing needle bars 9 above the lockstitch gripper 2, wherein in each case a needle bar 9, a hold-down 12 and a thread lever 14 are connected to the respective drive.
  • FIG. 2 shows the typical movement diagram of the known kinematic interaction of the needle 8 with a lockstitch 2, which rotates twice according to the prior art, as well as the feed device and the hold-down device 12, not shown, over one revolution of the machine main shaft.
  • the graph 17 illustrates the movement of the tip of the needle 8 to the surface of the needle plate.
  • the needle tip emerges at the time 18 through the tap hole below the surface of the throat plate 4 and rises again at time 19 on this.
  • the graph 20 illustrates the lifting movement and the distance of the underside of the blank holder 12 on the stitch plate 4 from.
  • the graph 21 indicates the progress of the embroidery frame movement relative to the last needle drop point at the time point 18 on the embroidery bottom.
  • the start of the embroidery frame movement takes place at the time 22 and thus shortly after the time 19, which corresponds to the time of exit of the needle 8 from the throat plate 4.
  • the graph 23 represents the thread requirement of the needle 8, beginning at time 24, when its eye descends below the embroidery bottom surface.
  • the top of the lockstitch gripper 2 enters the needle thread loop formed by the needle 8, whereby the lockstitch gripper 2 takes control of the needle thread.
  • Its yarn requirement is represented by the graph 26.
  • the tip of the lockstitch gripper 2 first expands the thread loop presented to it by the needle 8 and then guides it around the bobbin case 7 arranged inside the lockstitch gripper 2. Thereafter, the thread requirement of the lockstitch gripper 2 decreases again until the gripper closes Needle thread at time 27 completely releases again.
  • the lockstitch gripper 2 is therefore only in the time between the points 25 and 27 in contact with the needle thread.
  • the thread requirement of needle 8 and lockstitch gripper 2 is opposed by the threading according to graph 28. It is a function of the pivotal position of the thread lever 14 about its axis 15.
  • the threading according to the graph 28 points opposite to the Thread requirement (23, 26) on a surplus. This serves as a reserve, from which the stitch length-dependent thread consumption is taken from the previous stitch cycle.
  • the threading 28 is reduced by the amount of this thread consumption, so that the effective threading with the graph 29 is identical.
  • a difference to the diagram of a sewing machine relates to the length of the time window for the movement of the embroidery frame. For the sewing machine this is approx. 120 °. In the gripper embroidery machine but 180 ° and more. The beginning of the embroidery frame movement at the time 22, therefore, according to the prior art, according to temporally advanced. Although this is a necessary concession to the numerically controlled embroidery frame drive, which is independent of the embroidery mechanism, it leads to a not inconsiderable embroidery disadvantage with regard to the size of the required thread tension.
  • FIG. 4 it can be seen that to secure the bobbin case 6 against rotation on this a radially directed groove 34 is provided, into which a stationary stop piece 35 engages with a nose, so that the needle thread between the stop piece 35 and the lateral boundary surface 36 of the groove 34 are moved therethrough can. If, with stitch lengths greater than 2 mm, the last insertion point of the needle 8 is displaced more than one millimeter to the middle of the stitch hole by the embroidery bottom movement according to graph 21 in the time domain 31, two deflections 32, 33 (FIG. Fig. 4 ) of the needle thread on the way between the thread lever 14, the groove 34 and the stop piece 35.
  • the magnitude of the force F2 is given by the stitch formation process and therefore can not be changed. So that this again reaches the value specified by the system, the thread force F1 must be increased even with favorable material pairings with a factor "K" of approx. 2.5. In unfavorable material pairings (cotton thread / embroidery bottom of cotton), this factor "K” tends to the value of 4. The thus increased thread force F1 corresponds to the minimum retention force of the thread brake 16 when thread feeding through the thread lever 14th
  • Fig. 5 the conditions for the time window 31 are shown, in which the thread lever 14 attracts the thread loop and the thread passage between the nose of the stop piece 35 and the lateral boundary surface 36 of the groove 34 opens, wherein the advancing movement of the embroidery base against the advancing movement in Fig. 4 is reversed and in the direction of the arrow in Fig. 5 he follows.
  • the needle thread is devoured not only with the looper thread 37, but also with itself. In the sewing machine, this transport direction and situation hardly occurs.
  • FIG. 3 According to the invention shown diagram of the movement of the stitch pattern tools corresponds with the exception of the movement of the lockstitch gripper 2 and the dependent course of the thread requirement and the thread release graph 26, 28 and 29 the diagram Fig. 2 ,
  • the present invention allows the operation of a gripper embroidery machine with a thread tension, which is only slightly above the systemic minimum voltage for reasons of reliability of the stitch formation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Sewing Machines And Sewing (AREA)

Description

Die Erfindung betrifft Ein- oder Mehrkopfstickmaschinen mit Stichbildewerkzeugen die von jeweils einer mit einem Doppelsteppstich-Greifer zur Erzeugung von Stichen zusammenwirkenden Nadel gebildet sind, und eine Vorschubvorrichtung zur Erzielung von Relativbewegungen zwischen dem Stickboden und den Stichbildewerkzeugen aufweisen.The invention relates to single-head or multi-head embroidery machines with stitch imaging tools which are each formed by a needle cooperating with a lockstitch gripper for producing stitches, and have a feed device for achieving relative movements between the embroidery bottom and the stitch pattern tools.

Der hierbei überwiegend verwendete Doppelsteppstich-Greifer ist ein pro Stichbildeperiode zwei volle Umdrehungen ausführender Umlaufgreifer wie er bei Nähmaschinen als "Standard-Greifer" hunderttausendfach zum Einsatz kommt und sich hier auch sehr gut bewährt hat. Dieser Doppelsteppstich-Greifer erfordert für die Stichbildung, insbesondere für den Sticheinzug eine bestimmte Größe der Fadenspannung.The lockstitch gripper, which is predominantly used here, is a revolving gripper which executes two full revolutions per stitching period, as it is used a hundred thousandfold in sewing machines as a "standard gripper" and has also proven itself very well here. This lockstitch gripper requires a certain size of the thread tension for the stitch formation, in particular for the Sticheinzug.

Durch die unterschiedlichen Aufgaben einer genähten Naht ("Nähnaht") einerseits und einer gestickten Naht ("Sticknaht") andererseits ist ein wesentlicher Unterschied in den Anforderungen an eine Nähmaschine bzw. an eine Stickmaschine begründet. Während die Nähnaht im Wesentlichen eine Verbindungs- oder Befestigungsnaht darstellt, mit der meist zwei oder mehrere Teile fest miteinander verbunden werden, stellt die gestickte Naht eine auf den Stickboden aufgebrachte Verzierung (Ziernaht) dar, die keinerlei Kräfte zu übertragen hat.Due to the different tasks of a sewn seam ("sewing seam") on the one hand and an embroidered seam ("stitching") on the other hand, a significant difference in the requirements for a sewing machine or an embroidery machine is justified. While the sewing seam essentially represents a connecting or fastening seam with which usually two or more parts are firmly connected to each other, the embroidered seam represents an embroidery (ornamental seam) applied to the embroidery floor, which has no forces to transmit.

Die Festigkeit der Befestigungsnaht wird dabei dadurch erreicht, dass die vom Greifer abgefallene Fadenschlinge durch den Fadenhebel mit relativ großer Kraft in Richtung zur Oberseite des Nähgutes gezogen wird, damit die Verknotung von Nadel- und Greiferfaden mittig in den zu vernähenden Stofflagen zu liegen kommt. Dementsprechend ist auch die Fadenkraft des Greiferfadens zu bemessen.The strength of the fastening seam is thereby achieved that the fallen from the gripper thread loop is pulled by the thread lever with relatively large force in the direction of the top of the fabric, so that the knotting of needle and hook thread comes to rest in the middle to be sewn fabric layers. Accordingly, the thread force of the looper thread is to be measured.

Völlig anders sind die Verhältnisse bei der Bildung einer gestickten Naht. Da hier der Nadelfaden (=Stickfaden) zur Erzielung von Ziereffekten auf der Oberseite des Stickgutes nur sauber aufliegen soll, wird die Fadenspannung beim Stickvorgang möglichst so gering gehalten, dass der Stickfaden auf dem Stickboden zwar lagemäßig ausreichend gesichert ist, dennoch aber keine losen Fadenanteile entstehen, und die Verknotung zwischen Nadel- und Greiferfaden immer an der Unterseite des Stickbodens zu liegen kommt.Completely different are the conditions in the formation of an embroidered seam. Since here the needle thread (= embroidery thread) to achieve decorative effects on the top of the embroidery material should rest only clean, the thread tension is kept as low as possible during the embroidery process, that the embroidery thread on the embroidery floor positionally is sufficiently secured, but still no loose thread portions arise, and the knot between needle and looper thread always comes to rest on the underside of the embroidery base.

Aus diesem Grund wird für Stickmaschinen gegenüber Nähmaschinen eine wesentlich geringere Spannung des Nadelfadens angestrebt.For this reason, a much lower tension of the needle thread is sought for sewing machines compared to sewing machines.

Da bei der Übernahme des pro Stichbildeperiode zwei Umdrehungen ausführenden Doppelsteppstich-Greifers in die Stickmaschine deren Kinematik nicht entsprechend angepasst wurde, setzt selbst bei den aktuellen Stickmaschinen die Vorschubbewegung für den Stickboden schon zu einem Zeitpunkt ein, zu dem der Stichbildevorgang noch nicht völlig abgeschlossen ist. Dies ist in so weit sehr nachteilig weil sich hierdurch der Stickboden zum Zeitpunkt des Beginns des Fadeneinzuges durch den Fadenhebel schon um einen beträchtlichen Betrag gegenüber seiner Lage beim Einstich der Nadel in den Stickboden verschoben hat. In der Folge erfährt der vom Stichloch zum Fadenvorrat führende Schenkel der Fadenschlinge sowohl bei seinem Austritt aus dem Stichloch, als auch unmittelbar nach seinem Durchtritt durch den Stickboden jeweils eine zusätzliche Umlenkung. Die beiden Umlenkungen verursachen beim Einzug des Fadens durch den Fadenhebel einen zusätzlichen Widerstand, der zwangsweise zu der unerwünschten Erhöhung der Mindestgröße der Fadenspannung führt.Since in the acquisition of per stitch pattern two turns exporting lockstitch gripper in the embroidery machine whose kinematics has not been adjusted accordingly, even with the current embroidery machines, the advancing movement for the embroidery floor already at a time at which the stitching process is not yet complete. This is very disadvantageous in so far as this has shifted the embroidery bottom at the time of the beginning of the thread feed through the thread lever by a considerable amount compared to its position during the insertion of the needle into the embroidery floor. As a result, the leg of the thread loop leading from the stitch hole to the thread supply experiences an additional deflection both at its exit from the stitch hole and immediately after it has passed through the embroidery base. The two deflections cause when pulling the thread through the thread lever an additional resistance that forcibly leads to the undesirable increase in the minimum size of the thread tension.

Diese Situation wirkt sich bei Stickmaschinen insgesamt in so weit, besonders nachteilig aus, als diese gegenüber Nähmaschinen im Allgemeinen sowohl mit wesentlich größeren Stichlängen, als auch mit in unterschiedliche Richtungen verlaufenden Vorschubrichtungen arbeiten.This situation affects embroidery machines as a whole in so far, particularly disadvantageous, as they work against sewing machines generally both with much larger stitch lengths, as well as extending in different directions feed directions.

Aus der US 2008/0216722 A1 ist eine Zick-Zack-Nähmaschine bekannt, die mit einem Nadeltransport versehen ist, um eine Nadel einer Nähmaschine in einer rechten und einer linken Nadelposition anzuordnen. Durch den während eines Nahterzeugungsvorgangs vorgenommenen Nadeltransport ergeben sich Synchronisationsschwierigkeiten zwischen dem Greifer der Nähmaschine und dessen Nadel in ihren beiden Positionen. Die US 2008/0216722 A1 schlägt vor, zur Korrektur der sich bei unterschiedlichen links/rechts Positionen der Nadel ergebenden Synchronisationsabweichungen die Rotationsgeschwindigkeit des Getriebes des Greifers zu variieren.From the US 2008/0216722 A1 For example, there is known a zig-zag sewing machine provided with a needle feed for placing a needle of a sewing machine in right and left needle positions. Due to the needle transport made during a seam-forming operation, synchronization difficulties between the gripper of the sewing machine and its needle result in its two positions. The US 2008/0216722 A1 suggests to vary the rotational speed of the transmission of the gripper to correct for the synchronization deviations resulting in different left / right positions of the needle.

In der DE 197 51 083 A1 ist eine Nähmaschine mit einer mittels einer Hauptwelle angetriebenen Nadelstange sowie mit einem von der Hauptwelle mechanisch unabhängigen Antriebsmotor beschrieben, der einen Schlingengreifer der Nähmaschine antreibt. Der Antrieb der Hauptwelle und der Antriebsmotor des Schlingengreifers sind miteinander synchronisiert, stehen jedoch mechanisch nicht miteinander in Wirkverbindung. Aufgrund bestimmter Einsatzbedingungen kann es bei solchen Nähmaschinen zu Synchronisationsdiskrepanzen kommen. Die der DE 197 51 083 A1 zugrunde liegende Erfindung soll diese Synchronisationsdiskrepanz verhindern. Hierzu sind Sensoren vorgesehen, mit denen Zustandsinformationen der Hauptwelle, des Nähmotors, des Schlingengreifers und des Schlingengreiferantriebsmotors erfaßt werden. Mit einer Synchronisationssteuereinheit wird auf Basis der ermittelten Zustandsinformationen eine Drehzahlkorrektur ermittelt, durch die eine Synchronisierung der Hauptwelle und des Schlingengreifers erzielt werden kann.In the DE 197 51 083 A1 a sewing machine is described with a driven by a main shaft needle bar and with a mechanically independent of the main shaft drive motor which drives a looper of the sewing machine. The drive of the main shaft and the drive motor of the loop taker are synchronized with each other, but are not mechanically connected to each other in operative connection. Due to certain conditions of use, such sewing machines may experience synchronization discrepancies. The the DE 197 51 083 A1 The underlying invention is intended to prevent this synchronization discrepancy. For this purpose, sensors are provided with which state information of the main shaft, the sewing motor, the loop taker and the loop taker drive motor are detected. With a synchronization control unit, a speed correction is determined on the basis of the determined state information, by which a synchronization of the main shaft and the loop taker can be achieved.

Auch in der US 4,690,081 wird eine Nähmaschine offenbart, bei der für eine Vielzahl verschiedener angetriebener Komponenten der Nähmaschine, beispielsweise Nadelstange, Greifer, Presserfuß, Transportmittel oder Fadenspannvorrichtung, jeweils ein separater Antrieb vorgesehen ist. Mit jedem der separaten Antriebe soll jeweils eine Antriebsbewegung erzeugbar sein, die unabhängig von Antriebsbewegungen der anderen Antriebe ist. Hierdurch soll eine weitgehende Einstellbarkeit der Nähmaschine auf unterschiedliche Einsatzfälle möglich sein, beispielsweise um die Nähmaschine auf unterschiedliche zu verarbeitende Materialien, Anzahl an miteinander zu vernähenden Nähgutlagen und ähnliches einstellen zu können.Also in the US 4,690,081 a sewing machine is disclosed in which a separate drive is provided for a plurality of different driven components of the sewing machine, for example needle bar, gripper, presser foot, transport means or thread tensioning device. With each of the separate drives each drive movement should be generated, which is independent of drive movements of the other drives. As a result, a substantial adjustability of the sewing machine to different applications should be possible, for example, to be able to set the sewing machine to different materials to be processed, number of sewing material layers to be sewn together and the like.

Der Erfindung liegt daher die Aufgabe zu Grunde, eine Lösung zu schaffen, die es ermöglicht, bei Stickmaschinen mit Doppelsteppstich-Umlaufgreifern die Mindestfadenspannung im gewünschten wesentlich niedrigerem Bereich zu halten.The invention is therefore based on the object to provide a solution that makes it possible to keep the minimum thread tension in the desired much lower range in embroidery machines with lockstitch circular grippers.

Die Erfindung geht dabei von der Erkenntnis aus, dass sich bei Doppelsteppstich-Greifer-Stickmaschinen die Stichbildung einerseits und die Vorschubbewegung des Stickguts andererseits zumindest teilweise derart überlappen, dass die Vorschubbewegung des Stickgutes schon dann einsetzt, wenn die Stichbildung noch nicht vollständig abgeschlossen ist, d.h. der Nadelfaden durch den Fadenhebel noch nicht völlig eingezogen ist.The invention is based on the recognition that at lockstitch gripper embroidery machines, the stitch formation on the one hand and the feed movement of the embroidery on the other hand at least partially overlap such that the advancing movement of the embroidery already begins when the stitching is not complete is completed, ie the needle thread is not completely retracted by the thread lever.

Zur Lösung der vorgenannten Aufgabe wird zur Vermeidung der zeitlichen Überlappung der Stichbildung mit der Vorschubbewegung des Stickbodens vorgeschlagen, den Doppelsteppstich-Greifer mit einer Drehzahl umlaufen zu lassen, die der n-fachen Drehzahl der Hauptwelle der Stickmaschine entspricht, wobei <"n" eine ganze Zahl ist, die größer als die Zahl "2" ist>.To solve the above problem, it is proposed to avoid the temporal overlap of stitch formation with the advancing movement of the embroidery base, to let the lockstitch gripper rotate at a speed that corresponds to n times the speed of the main shaft of the embroidery machine, wherein <"n" a whole Number is greater than the number "2">.

Dadurch dass der Doppelsteppstich-Greifer beispielsweise mit <"n" gleich 3"> umläuft, ist die Stichbildung -bezogen auf den von der Maschinenhauptwelle zurück gelegten Drehwinkel- entsprechend der hierdurch entstehenden größeren Winkelgeschwindigkeit des Doppelsteppstich-Greifers früher als bei mit <"n gleich 2"> umlaufendem Doppelsteppstich-Greifer beendet. Das Zeitfenster, in dem die Stichbildung und die Vorschubbewegung des Stickbodens gleichzeitig aktiv sind, ist damit minimiert.Because the lockstitch gripper revolves with <"n" equal to 3 ">, for example, the stitch formation-corresponding to the greater angular speed of the lockstitch gripper resulting from the main machine shaft-is earlier than at <" n The time window in which the stitch formation and the feed movement of the embroidery base are active at the same time is thus minimized.

Da pro Stichbildeperiode zweifach umlaufende Doppelsteppstich-Greifer im Bereich der sogenannten Schnellnäher mit weit höheren Drehzahlen absolut zufriedenstellende Ergebnisse erzeugen, ist offensichtlich, dass die erfindungsgemäße Erhöhung der Drehzahl des Doppelsteppstich-Greifers weder die Qualität der erzeugten Nähte noch die mechanische Haltbarkeit negativ beeinflusst.Since per double stitching lockstitch grippers produce absolutely satisfactory results in the area of the so-called high-speed stitches, it is obvious that the increase in the speed of the lockstitch gripper according to the invention negatively affects neither the quality of the seams produced nor the mechanical durability.

Während bei der vorbeschriebenen Lösung der Doppelsteppstich-Greifer mit konstanter <"n-facher"> Drehzahl der Maschinenhauptwelle umläuft, ist eine weitere Lösung der der Erfindung zu Grunde liegenden Aufgabe darin zu sehen, den Doppelsteppstich-Greifer mit gegenüber der Hauptwelle der Maschine sich periodisch veränderbarer Winkelgeschwindigkeit umlaufen zu lassen, wobei die Winkelgeschwindigkeit des Doppelsteppstich-Greifers während seiner Arbeitsumdrehungen den größeren und während seiner Leerumdrehungen den demgegenüber kleineren Wert aufweist.While in the above-described solution the lockstitch gripper rotates at a constant <"n-fold"> speed of the machine main shaft, a further solution of the object underlying the invention is to see the lockstitch gripper periodically with respect to the main shaft of the machine circulating variable angular velocity, wherein the angular velocity of the lockstitch gripper during its working revolutions has the larger and during its idle revolutions the other hand, smaller value.

Die Erfindung ist nachstehend anhand eines Ausführungsbeispieles mit entsprechenden Diagrammen näher erläutert.The invention is explained below with reference to an embodiment with corresponding diagrams.

Es zeigt:

  • Fig. 1 : Einen Teilschnitt des vorderen Bereiches eines üblichen Stickkopfes mit einem Doppelsteppstich-Greifer;
  • Fig. 2 : Ein Weg / Zeit Diagramm der Bewegungen der Stichbildewerkzeuge und der Vorschubeinrichtung nach dem Stand der Technik, mit sich zeitweise überlappenden Zeitfenstern für die Stichbildung und die Vorschubbewegung;
  • Fig. 3 : Ein Weg / Zeit Diagramm der Bewegungen der Stichbildewerkzeuge und der Vorschubeinrichtung gemäß der Erfindung;
  • Fig. 4 : Die Situation der Fadenschlinge beim Durchgang an der Verdrehstütze (Anhaltestück) des Spulenkapselträgers des Doppelsteppstich-Greifers entsprechend dem Zeitfenster 31 in Figur 2- gemäß dem Stand der Technik;
  • Fig. 5 : Wie Fig 4, jedoch dargestellt für eine andere Richtung der Vorschubbewegung des Stickrahmens.
  • Fig. 6 : Die Situation der Fadenschlinge beim Durchgang an der Verdrehstütze (Anhaltestück) des Spulenkapselträgers des Doppelsteppstich-Greifers - entsprechend dem Zeitfenster 31 in Figur 3 - gemäß der Erfindung.
It shows:
  • Fig. 1 : A partial section of the front portion of a conventional embroidery head with a lockstitch gripper;
  • Fig. 2 : A path / time diagram of the movements of the stitch pattern tools and the advancing device according to the prior art, with temporally overlapping time windows for the stitch formation and the advancing movement;
  • Fig. 3 : A path / time diagram of the movements of the stitching tools and the feed device according to the invention;
  • Fig. 4 : The situation of the thread loop when passing at the twist support (stopper piece) of the bobbin case carrier of the lockstitch rapier corresponding to the time window 31 in FIG FIG. 2 - According to the prior art;
  • Fig. 5 : How Fig. 4 , but shown for a different direction of the advancing movement of the hoop.
  • Fig. 6 : The situation of the thread loop when passing the twist support (stopper piece) of the bobbin case carrier of the lockstitch rapier - corresponding to the time window 31 in FIG FIG. 3 - According to the invention.

In Fig. 1 ist das Vorderteil 1 eines üblichen Stickkopfes in Schnittdarstellung gezeigt, das einen Doppelsteppstich-Greifer 2, eine Tischplatte 3, sowie eine Stichplatte 4 aufweist. Auf der Tischplatte 3 liegt der in zwei Achsen frei bewegbare Stickrahmen 5 auf, in den der Stickboden eingespannt wird. Der Doppelsteppstich-Greifer 2 ist üblicher Bauart und weist einen Spulenkapselträger 6 zur Aufnahme einer Spulenkapsel 7 auf. In der Spulenkapsel 7 ist die den Greiferfadenvorrat aufnehmende Spule drehbar gelagert.In Fig. 1 the front part 1 of a conventional embroidery head is shown in sectional view, which has a lockstitch gripper 2, a table top 3, and a throat plate 4. On the table top 3 is the freely movable in two axes embroidery frame 5, in which the embroidery bottom is clamped. The lockstitch gripper 2 is of conventional design and has a bobbin case carrier 6 for receiving a bobbin case 7. In the bobbin case 7, the bobbin thread supply receiving coil is rotatably mounted.

Die mit dem Doppelsteppstich-Greifer 2 zusammenwirkende und eine Nadel 8 tragende Nadelstange 9 ist in einem Grundrahmen 10 vertikal bewegbar aufgenommen und wird in an sich bekannter Weise von einem Mitnehmer 11 angetrieben, der die Antriebsbewegung des Nadelantriebes auf die Nadelstange 9 überträgt. Am Vorderteil 1 des Stickkopfes ist ferner pro Stickfaden ein Niederhalter 12 vorgesehen, der auf der Nadelstange 9 verschieblich angeordnet ist und von einem Mitnehmer 13 angetrieben wird. Weiterhin ist am Vorderteil 1 des Stickkopfes pro Stickfaden ein in bekannter Weise angetriebener Fadenhebel 14 angeordnet, der auf einer Achse 15 schwenkbar gelagert ist, die ihrerseits im Grundrahmen 10 aufgenommen ist. Schließlich weist der Stickkopf in bekannter Weise einstellbare Fadenbremse 16 auf, die ortsfest am Vorderteil 1 angebracht ist.The cooperating with the lockstitch gripper 2 and a needle 8-bearing needle bar 9 is vertical in a base frame 10 movably received and is driven in a conventional manner by a driver 11, which transmits the drive movement of the needle drive to the needle bar 9. At the front part 1 of the embroidery head, a hold-down 12 is further provided per embroidery thread, which is arranged displaceably on the needle bar 9 and is driven by a driver 13. Furthermore, on the front part 1 of the embroidery head per embroidery thread in a known manner driven thread lever 14 is arranged, which is pivotally mounted on an axis 15, which in turn is received in the base frame 10. Finally, the embroidery head in a known manner adjustable yarn brake 16 which is fixedly attached to the front part 1.

Der nicht näher dargestellte hintere Teil des Stickkopfes ist mit dem Maschinengestell fest verbunden und trägt die Antriebe für die Nadelstange 9, den Niederhalter 12 und den Fadenhebel 14. Der hintere Teil des Stickkopfes ist ferner über eine nicht näher dargestellte Geradführung mit dem Vorderteil 1 verbunden, so daß dieses innerhalb einer vertikalen Ebene in Richtung der Flucht der vorhandenen Nadelstangen 9 oberhalb des Doppelsteppstich-Greifers 2 verschoben werden kann, wobei jeweils eine Nadelstange 9, ein Niederhalter 12 und ein Fadenhebel 14 mit dem jeweiligen Antrieb verbunden sind.The rear part of the embroidery head not shown is fixedly connected to the machine frame and carries the drives for the needle bar 9, the hold-down 12 and the thread lever 14. The rear part of the embroidery head is also connected via a straight guide, not shown, with the front part 1, so that it can be moved within a vertical plane in the direction of the flight of the existing needle bars 9 above the lockstitch gripper 2, wherein in each case a needle bar 9, a hold-down 12 and a thread lever 14 are connected to the respective drive.

Der Antrieb der vorgenannten Teile erfolgt mit Ausnahme des Antriebes des Doppelsteppstich-Greifers 2 von einer nicht dargestellten Maschinen-Hauptwelle, die pro Stichbildeperiode eine volle, d. h. eine 360° umfassende Drehbewegung ausführt. Während beim Stand der Technik der Doppelsteppstich-Greifer 2 mit der doppelten Drehzahl, also mit <"n= 2"> umläuft, läuft erfindungsgemäß der Doppelsteppstich-Greifer 2 mit <"n= eine ganze Zahl, die größer ist als die Zahl "2> um.
Demzufolge ist bei dem gezeigten Ausführungsbeispiel der Erfindung zwischen der Maschinenhauptwelle und dem Doppelsteppstich-Greifer 2 ein Übersetzungsgetriebe mit einem Übersetzungsverhältnis "n= 3" vorgesehen.The drive of the aforementioned parts is done with the exception of the drive of lockstitch gripper 2 by a machine main shaft, not shown, which performs a full, ie a 360 ° comprehensive rotational movement per stitch forming period. While in the prior art the lockstitch gripper 2 rotates at twice the speed, that is with <"n = 2">, according to the invention the lockstitch gripper 2 runs with <"n = an integer greater than the number" 2 > around.
Accordingly, in the illustrated embodiment of the invention between the machine main shaft and the lockstitch gripper 2, a transmission gear with a transmission ratio "n = 3" is provided.

Zum Verständnis der Erfindung wird zunächst auf Fig. 2 eingegangen, die das typische Bewegungsdiagramm des bekannten kinematischen Zusammenwirkens der Nadel 8 mit einem gemäß dem Stand der Technik zweifach umlaufendem Doppelsteppstich-Greifer 2, sowie der nicht dargestellten Vorschubeinrichtung und des Niederhalters 12 über einer Umdrehung der Maschinenhauptwelle zeigt.To understand the invention is first on Fig. 2 which shows the typical movement diagram of the known kinematic interaction of the needle 8 with a lockstitch 2, which rotates twice according to the prior art, as well as the feed device and the hold-down device 12, not shown, over one revolution of the machine main shaft.

Der Graph 17 stellt die Bewegung der Spitze der Nadel 8 zur Oberfläche der Stichplatte dar. Die Nadelspitze taucht im Zeitpunkt 18 durch das Stichloch unter die Oberfläche der Stichplatte 4 und erhebt sich zum Zeitpunkt 19 wieder über diese.The graph 17 illustrates the movement of the tip of the needle 8 to the surface of the needle plate. The needle tip emerges at the time 18 through the tap hole below the surface of the throat plate 4 and rises again at time 19 on this.

Der Graph 20 bildet die Hubbewegung und den Abstand der Unterseite des Niederhalters 12 über der Stichplatte 4 ab.The graph 20 illustrates the lifting movement and the distance of the underside of the blank holder 12 on the stitch plate 4 from.

Der Graph 21 zeigt den Fortschritt der Stickrahmenbewegung an, relativ zum letzten Nadeleinstichpunkt zum Zeitpunkt 18 auf dem Stickboden.The graph 21 indicates the progress of the embroidery frame movement relative to the last needle drop point at the time point 18 on the embroidery bottom.

Der Start der Stickrahmenbewegung erfolgt zum Zeitpunkt 22 und somit kurz nach dem Zeitpunkt 19, der dem Zeitpunkt des Austrittes der Nadel 8 aus der Stichplatte 4 entspricht. Das Ende der Stickrahmenbewegung fällt mit dem Ende des Diagramms zusammen.
Alle Werte dieser Bewegungsfunktion sind mit der variablen Stichlänge (= Abstand vom letzten Einstichpunkt 18 zum zukünftigen Nadeleinstichpunkt) als konstantem Faktor linear skaliert.The start of the embroidery frame movement takes place at the time 22 and thus shortly after the time 19, which corresponds to the time of exit of the needle 8 from the throat plate 4. The end of the embroidery frame movement coincides with the end of the diagram.
All values of this motion function are scaled linearly with the variable stitch length (= distance from the last insertion point 18 to the future needle entry point) as a constant factor.

Der Graph 23 repräsentiert den Fadenbedarf der Nadel 8, beginnend zum Zeitpunkt 24, wenn deren Öhr abwärts unter die Stickbodenoberfläche taucht. Beim Zeitpunkt 25 tritt die Spitze des Doppelsteppstich-Greifers 2 in die von der Nadel 8 gebildete Nadelfadenschleife ein, wodurch der Doppelsteppstich-Greifer 2 die Kontrolle über den Nadelfaden übernimmt. Sein Fadenbedarf ist durch den Graphen 26 dargestellt. Die Spitze des Doppelsteppstich-Greifers 2 weitet zunächst die ihm von der Nadel 8 dargebotene Fadenschlinge auf und führt sie dann um die innerhalb des Doppelsteppstich-Greifers 2 angeordnete Spulenkapsel 7. Danach nimmt der Fadenbedarf des Doppelsteppstich-Greifers 2 wieder ab, bis der Greifer den Nadelfaden zum Zeitpunkt 27 wieder vollständig freigibt. Der Doppelsteppstich-Greifer 2 ist also nur in der Zeit zwischen den Punkten 25 und 27 mit dem Nadelfaden in Kontakt. Dies entspricht maximal 180° der 360° der Stichbildeperiode, die restliche Zeit bewegt sich der Doppelsteppstich-Greifer 2 leer, d. h. der Doppelsteppstich-Greifer 2 kommt erst in der nächst folgenden Stichbildeperiode wieder in Kontakt mit dem Nadelfaden.The graph 23 represents the thread requirement of the needle 8, beginning at time 24, when its eye descends below the embroidery bottom surface. At time 25, the top of the lockstitch gripper 2 enters the needle thread loop formed by the needle 8, whereby the lockstitch gripper 2 takes control of the needle thread. Its yarn requirement is represented by the graph 26. The tip of the lockstitch gripper 2 first expands the thread loop presented to it by the needle 8 and then guides it around the bobbin case 7 arranged inside the lockstitch gripper 2. Thereafter, the thread requirement of the lockstitch gripper 2 decreases again until the gripper closes Needle thread at time 27 completely releases again. The lockstitch gripper 2 is therefore only in the time between the points 25 and 27 in contact with the needle thread. This corresponds to a maximum of 180 ° of the 360 ° stitch pattern period, the rest of the time, the lockstitch gripper 2 moves empty, d. H. the lockstitch gripper 2 comes again in contact with the needle thread in the next stitch forming period next.

Dem Fadenbedarf von Nadel 8 und Doppelsteppstich-Greifer 2 steht die Fadengabe entsprechend Graph 28 gegenüber. Sie ist eine Funktion der Schwenkposition des Fadenhebels 14 um dessen Achse 15. Die Fadengabe entsprechend dem Graph 28 weist gegenüber dem Fadenbedarf (23, 26) einen Überschuss auf. Dieser dient als Reserve, aus der der stichlängenabhängige Fadenverbrauch aus dem vorhergehenden Stichzyklus entnommen wird.The thread requirement of needle 8 and lockstitch gripper 2 is opposed by the threading according to graph 28. It is a function of the pivotal position of the thread lever 14 about its axis 15. The threading according to the graph 28 points opposite to the Thread requirement (23, 26) on a surplus. This serves as a reserve, from which the stitch length-dependent thread consumption is taken from the previous stitch cycle.

Die Fadengabe 28 ist um den Betrag dieses Fadenverbrauchs gemindert, so dass die effektive Fadengabe mit dem Graph 29 identisch ist. Der besagte Fadenverbrauch wird erst im Zeitbereich zwischen dem Zeitpunkt 30 und Fadenhebel OT durch den Fadenhebel 14 vom Nadelfadenvorrat abgezogen und dabei die Systemfadenlänge (= gesamte Länge des Nadelfadens zwischen der Fadenbremse 14 bis zur Stichplatte 4, bei der höchsten Schwenkstellung des Fadenhebels 14 wieder neu ausgeglichen.The threading 28 is reduced by the amount of this thread consumption, so that the effective threading with the graph 29 is identical. The said thread consumption is only deducted in the time range between the time 30 and thread lever OT by the thread lever 14 from the needle thread stock while the system thread length (= entire length of the needle thread between the thread brake 14 to the throat plate 4, at the highest pivot position of the thread lever 14 again compensated ,

Ein Unterschied zum Diagramm einer Nähmaschine betrifft die Länge des Zeitfensters für die Bewegung des Stickrahmens. Bei der Nähmaschine beträgt dieses ca. 120°. Bei der Greiferstickmaschine aber 180° und auch mehr. Der Beginn der Stickrahmenbewegung zum Zeitpunkt 22, ist deshalb beim Stand der Technik entsprechend zeitlich vorverlegt. Dies ist zwar ein notwendiges Zugeständnis an den von der Stickmechanik unabhängigen, numerisch gesteuerten Stickrahmenantrieb, führt aber hinsichtlich der Größe der erforderlichen Fadenspannung zu einem nicht unerheblichen sticktechnischen Nachteil.A difference to the diagram of a sewing machine relates to the length of the time window for the movement of the embroidery frame. For the sewing machine this is approx. 120 °. In the gripper embroidery machine but 180 ° and more. The beginning of the embroidery frame movement at the time 22, therefore, according to the prior art, according to temporally advanced. Although this is a necessary concession to the numerically controlled embroidery frame drive, which is independent of the embroidery mechanism, it leads to a not inconsiderable embroidery disadvantage with regard to the size of the required thread tension.

Die zeitliche Vorverlegung des Beginns der Vorschubbewegung des Stickrahmens in den Bereich deutlich vor den Zeitpunkt der Beendigung des Fadeneinzuges durch den Fadenhebel 14 zur Vollendung des begonnen Stiches führt dazu, dass der Stickboden vor Abschluß des Fadeneinzuges relativ zur Stichplatte 4 bewegt wird.The temporal advancing the beginning of the advancing movement of the embroidery frame in the area well before the time of completion of the thread take-up by the thread lever 14 to complete the initiated stitch causes the embroidery floor is moved relative to the stitch plate 4 before the conclusion of the thread take-up.

In Figur 4 erkennt man, daß zur Sicherung des Spulenkapselträgers 6 gegen Drehbewegung an diesem eine radial gerichtete Nut 34 vorgesehen ist, in die ein ortsfestes Anhaltestück 35 mit einer Nase eingreift, sodass der Nadelfaden zwischen dem Anhaltestück 35 und der seitlichen Begrenzungsfläche 36 der Nut 34 hindurch bewegt werden kann.
Ist nun bei Stichlängen größer als 2 mm der letzte Einstichpunkt der Nadel 8 zum Zeitpunkt 18 mehr als einen Millimeter zur Stichlochmitte durch die Stickbodenbewegung gemäß Graph 21 im Zeitbereich 31 verschoben, so entstehen zwei Umlenkungen 32, 33 (Fig. 4) des Nadelfadens auf dem Weg zwischen dem Fadenhebel 14, der Nut 34 und dem Anhaltestück 35. Die im Bereich des Nadelfadens oberhalb des Stickbodens zum Fadenhebel 14 hin gerichtete Fadenkraft F1 wird zuerst an der Umlenkung 32 und dann nochmals an der Umlenkung 33 in insgesamt 2 Schritten durch die Fadenreibung reduziert. Übrig bleibt die Kraft F2. Dies ist die Kraft, die zum Öffnen des Fadendurchganges zwischen dem Anhaltestück 35 und der seitlichen Begrenzungsfläche 36 der Nut 34 erforderlich ist.In FIG. 4 it can be seen that to secure the bobbin case 6 against rotation on this a radially directed groove 34 is provided, into which a stationary stop piece 35 engages with a nose, so that the needle thread between the stop piece 35 and the lateral boundary surface 36 of the groove 34 are moved therethrough can.
If, with stitch lengths greater than 2 mm, the last insertion point of the needle 8 is displaced more than one millimeter to the middle of the stitch hole by the embroidery bottom movement according to graph 21 in the time domain 31, two deflections 32, 33 (FIG. Fig. 4 ) of the needle thread on the way between the thread lever 14, the groove 34 and the stop piece 35. The directed in the needle thread above the embroidery base to the thread lever 14 towards thread force F1 is first reduced at the deflection 32 and then again at the deflection 33 in a total of 2 steps by the thread friction. What remains is the force F2. This is the force required to open the thread passage between the stopper piece 35 and the lateral boundary surface 36 of the groove 34.

Die Größe der Kraft F2 ist durch den Stichbildeprozess vorgegeben und ist daher nicht veränderbar. Damit diese wieder den vom System vorgegebenen Wert erreicht, muss die Fadenkraft F1 selbst bei günstigen Materialpaarungen mit einem Faktor "K" von ca. 2,5 erhöht werden. Bei ungünstigen Materialpaarungen (Baumwollfaden / Stickboden aus Baumwolle) tendiert dieser Faktor "K" gegen den Wert 4. Die so erhöhte Fadenkraft F1 entspricht der Mindestrückhaltekraft der Fadenbremse 16 beim Fadeneinzug durch den Fadenhebel 14.The magnitude of the force F2 is given by the stitch formation process and therefore can not be changed. So that this again reaches the value specified by the system, the thread force F1 must be increased even with favorable material pairings with a factor "K" of approx. 2.5. In unfavorable material pairings (cotton thread / embroidery bottom of cotton), this factor "K" tends to the value of 4. The thus increased thread force F1 corresponds to the minimum retention force of the thread brake 16 when thread feeding through the thread lever 14th

In Fig. 5 sind die Verhältnisse für das Zeitfenster 31 gezeigt, in dem der Fadenhebel 14 die Fadenschlinge anzieht und den Fadendurchgang zwischen der Nase des Anhaltestückes 35 und der seitlichen Begrenzungsfläche 36 der Nut 34 öffnet, wobei die Vorschubbewegung des Stickbodens gegenüber dessen Vorschubbewegung in Fig. 4 umgekehrt ist und in Richtung des Pfeils in Fig. 5 erfolgt. Dies entspricht etwa der Situation, in der beim Nähen oder Sticken die so genannten Schlingstiche entstehen. Dabei ist der Nadelfaden nicht nur mit dem Greiferfaden 37 verschlungen, sondern auch mit sich selbst. Bei der Nähmaschine tritt diese Transportrichtung und Situation kaum auf.In Fig. 5 the conditions for the time window 31 are shown, in which the thread lever 14 attracts the thread loop and the thread passage between the nose of the stop piece 35 and the lateral boundary surface 36 of the groove 34 opens, wherein the advancing movement of the embroidery base against the advancing movement in Fig. 4 is reversed and in the direction of the arrow in Fig. 5 he follows. This corresponds approximately to the situation in which the so-called loop stitches occur during sewing or embroidering. In this case, the needle thread is devoured not only with the looper thread 37, but also with itself. In the sewing machine, this transport direction and situation hardly occurs.

Bei der Greiferstickmaschine entsteht sie jedoch regelmäßig. Durch die intensivere Umschlingung an der Fadenumlenkstelle 32 erhöht sich der Faktor "K" weiter. Nachdem die Nadelfadenschlinge den Fadendurchgang passiert hat, fällt die Nadelfadenspannung fast auf Null ab. Der Fadenhebel 14 verkleinert die Nadelfadenschlinge weiter, bis sie an der Stelle 30 vollständig minimiert ist. Auf dem Weg dorthin wird der Nadelfadenteil 38 der bisher flach auf dem Stickboden lag, durch Reibung des Nadelfadens an der Verknotung 39 mit sich selbst, zu einer über den Stickboden aufragenden Fadenschlaufe 40 aufgebaut. Diese muss im Zeitbereich 30 bis Fadenhebel (OT) wieder eingezogen werden. Das gelingt umso besser je steiler der Nadelfadenfadenteil 41 zum Nadelöhr strebt und dabei, die Oberfläche des Stickbodens verlässt. Diese Steilheit nimmt mit dem zu diesem Zeitpunkt zurückgelegten Weg des Stickbodentransportes, (dem Graphen 21 nach, sind das dort nun schon 75% der Stichlänge), nach trigonometrischen Gesetzmäßigkeiten ab. Abhängig vom Reibbeiwert des verwendeten Nadelfadens ist der sichere Einzug der Fadenschlaufe 40 nur bis zu einer dazu gehörenden maximalen Stichlänge möglich.However, in the case of the hook-and-loop embroidery machine, it arises regularly. Due to the more intensive wrapping at the Fadenumlenkstelle 32, the factor "K" increases further. After the needle thread loop has passed the thread passage, the needle thread tension drops to almost zero. The thread lever 14 further reduces the needle thread loop until it is completely minimized at the point 30. On the way there, the needle thread part 38, which was previously lying flat on the embroidery base, is built up by friction of the needle thread on the knot 39 with itself, to form a thread loop 40 which rises above the embroidery bottom. This must be retracted in the time range 30 to thread take-up (TDC). This works the better the steeper the needle thread thread part 41 strives for the needle eye and thereby leaves the surface of the embroidery base. This steepness decreases with the distance of the embankment transport (at the point of view of the graphene 21, that is already 75% of the stitch length), according to trigonometric laws. Depending on the coefficient of friction the needle thread used is the safe collection of the thread loop 40 only up to a corresponding maximum stitch length possible.

Wie aus der Beschreibung zu den Figuren 4 und 5 hervorgeht, liegen die Umstände, welche die notwendige Fadenspannung erhöhen darin begründet, dass der Fadendurchgang zwischen dem Anhaltestück 35 und der seitlichen Begrenzungsfläche 36 der Nut 34 erst mitten in der laufenden, schon fortgeschrittener Vorschubbewegung des Stickbodens geschieht. Dies ist die Folge der zeitlichen Überlappung der Aktivitäten des Greifers bzw. der Stichbildung mit denen des Stickbodentransportes bzw. der Vorschubeinrichtung.As from the description of the FIGS. 4 and 5 As can be seen, the circumstances that increase the necessary thread tension are due to the fact that the thread passage between the stop piece 35 and the lateral boundary surface 36 of the groove 34 does not occur until the middle of the current, already advanced feed movement of the embroidery base. This is the consequence of the temporal overlap of the activities of the gripper or the stitch formation with those of the embankment transport or the feed device.

Damit ist offensichtlich, dass die Vorverlegung des Beginns der Vorschubbewegung des Stickrahmens in den zeitlichen Bereich des Hochziehens des Nadelfadens durch den Fadenhebel 14, zu einer unvermeidbaren Erhöhung der Fadenspannung führt. Genau das ist aber bei Stickmaschinen unerwünscht.Thus, it is obvious that the advancement of the start of the advancing movement of the embroidery frame into the time range of the pulling up of the needle thread by the thread lever 14, leads to an unavoidable increase in the thread tension. This is exactly what is undesirable for embroidery machines.

Das in Fig. 3 entsprechend der Erfindung gezeigte Diagramm der Bewegung der Stichbildewerkzeuge entspricht mit Ausnahme der Bewegung des Doppelsteppstich-Greifers 2 und dem davon abhängigen Verlauf der den Fadenbedarf und die Fadenfreigabe darstellenden Graphs 26, 28 und 29 dem Diagramm gemäß Fig. 2.This in Fig. 3 According to the invention shown diagram of the movement of the stitch pattern tools corresponds with the exception of the movement of the lockstitch gripper 2 and the dependent course of the thread requirement and the thread release graph 26, 28 and 29 the diagram Fig. 2 ,

Dadurch, dass der Doppelsteppstich-Greifer beispielsweise mit <"n" gleich 3"> umläuft, erfolgt die Stichbildung -bezogen auf den von der Maschinenhauptwelle zurück gelegten Drehwinkel- entsprechend der hierdurch entstehenden größeren Winkelgeschwindigkeit des Doppelsteppstich-Greifers früher als bei mit <"n gleich 2"> umlaufendem Doppelsteppstich-Greifer. Dies bedeutet, dass die Freigabe der Fadenschlinge durch den Doppelsteppstich-Greifer 2 -bezogen auf den Drehwinkel der Maschinenhauptwelle- zu einem früheren Zeitpunkt als beim zweifach umlaufenden Doppelsteppstich-Greifer erfolgt, und damit der die Schlingenfreigabe durch den Doppelsteppstich-Greifer markierende Zeitpunkt 27 gegenüber seiner Position im Diagramm gemäß Fig. 2 im Diagramm gemäß Fig. 3 nach links verlagert ist.Due to the fact that the lockstitch gripper revolves with <"n" equal to 3 ">, for example, the stitching takes place earlier than in the case of <" n-based on the angle of rotation returned by the machine main shaft, in accordance with the resulting greater angular velocity of the lockstitch gripper This means that the release of the thread loop by the lockstitch gripper 2 -related to the rotation angle of the machine main shaft- occurs earlier than with the double-circumference lockstitch gripper, and thus the loop release the lockstitch gripper marking time 27 relative to its position in the diagram according to Fig. 2 in the diagram according to Fig. 3 is shifted to the left.

Damit kann die Bewegung des Fadenhebels 14 zum Einzug der gebildeten Verschlingung von Nadel- und Greiferfaden -bezogen auf den Drehwinkel der Maschinenhauptwelle- zu einem entsprechend früheren Zeitpunkt einsetzen, sodass der Fadenhebel 14 den oberen Totpunkt (OT) seiner Bewegungsbahn dementsprechend früher erreicht, und damit die Stichbildung -bezogen auf den Drehwinkel der Maschinenhauptwelle- entsprechend früher abgeschlossen ist. Stichbildung und Vorschub sind nun zeitlich entflochten. Das Resultat ist in Fig. 6 dargestellt, die die Situation der Fadenschlinge kurz vor Fadenhebel (OT) zeigt, wenn der Rest der Fadenschlinge den Fadendurchgang zwischen dem Anhaltestückes 35 und der seitlichen Begrenzungsfläche 36 der Nut 34 passiert. Der dabei vom Faden zu überwindende Widerstand stellt die systembedingte Mindestfadenkraft (= Spannung) beim Einsatz eines Umlaufgreifers dar.Thus, the movement of the thread lever 14 for the insertion of the formed entanglement of needle and looper thread-related to the rotation angle of the machine main shaft-use at a corresponding earlier time, so that the thread lever 14 reaches the top dead center (TDC) of its trajectory accordingly earlier, and thus the stitch formation - related to the rotation angle of the machine main shaft - completed earlier accordingly. Stitch formation and feed are now temporally unbound. The result is in Fig. 6 which shows the situation of the thread loop just before the thread lever (OT) when the rest of the thread loop passes through the thread passage between the stop piece 35 and the lateral boundary surface 36 of the groove 34. The case of the thread to be overcome resistance represents the systemic minimum thread force (= voltage) when using a rotary gripper.

Im Vergleich mit den Figuren 4 und 5 sind die jeweiligen Fadenumlenkstellen an der Stichplatte und im Stickboden sowie im zur Nadel strebenden Schenkel der Fadenschlinge nicht mehr vorhanden. Dementsprechend entfallen aufgrund des Wegfalls der Fadenumlenkungen auch die hohen Reibkräfte und damit die bisher erforderliche Erhöhung der Fadenrückhaltekraft um den Faktor 2,5 bis 4 gegenüber der Mindestfadenkraft. Damit gestattet die vorliegende Erfindung den Betrieb einer Greiferstickmaschine mit einer Fadenspannung, die aus Gründen der Funktionssicherheit der Stichbildung nur geringfügig oberhalb der systembedingten Mindestspannung liegt.In comparison with the FIGS. 4 and 5 are the respective Fadenumlenkstellen on the needle plate and in the embroidery ground and in the direction of the needle-striving leg of the thread loop no longer available. Accordingly, eliminates due to the omission of the thread deflections and the high friction forces and thus the previously required increase the thread retention force by a factor of 2.5 to 4 compared to the minimum thread force. Thus, the present invention allows the operation of a gripper embroidery machine with a thread tension, which is only slightly above the systemic minimum voltage for reasons of reliability of the stitch formation.

Claims (3)

  1. Single-head or multi-head embroidery machine having stitch-forming tools which are each formed by a thread-guiding needle (8) which for forming stitches interacts with a double-lockstitch gripper (2), and an indexing installation for achieving relative movements between the embroidered goods and the stitch-forming tools, said relative movements being performed depending on the movements of the needle,
    characterized in that
    in order for a temporal overlap between the stitch-forming phase and the indexing movement of the stitched goods to be reduced, the double-lockstitch gripper (2) revolves at a rotation speed which corresponds to n-times the rotation speed of the main shaft, wherein "n" equals "3", and wherein a step-up gear unit having a gearing ratio of 1:3 is disposed between the main machine shaft and the double-lockstitch gripper (2).
  2. Single-head or multi-head embroidery machine according to Claim 1, characterized in that an embroidery base of the single-head or multi-head embroidery machine, prior to a thread being completely drawn in, is movable in relation to the needle plate (4).
  3. Single-head or multi-head embroidery machine according to Claim 1 or 2, characterized in that the double-lockstitch gripper (2) revolves at a constant rotation speed of 3 times the rotation speed of the main machine shaft.
EP11712469.3A 2010-03-24 2011-03-19 Two-thread lock stitch sewing machine or multi-head sewing machine with rotating shuttle Active EP2550387B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010013016A DE102010013016A1 (en) 2010-03-24 2010-03-24 Single or multi-head embroidery machine with lockstitch circular gripper
PCT/EP2011/001369 WO2011116912A2 (en) 2010-03-24 2011-03-19 Single-head or multi-head embroidery machine having a two-thread lockstitch rotary looper

Publications (2)

Publication Number Publication Date
EP2550387A2 EP2550387A2 (en) 2013-01-30
EP2550387B1 true EP2550387B1 (en) 2016-08-31

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Family Applications (1)

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EP11712469.3A Active EP2550387B1 (en) 2010-03-24 2011-03-19 Two-thread lock stitch sewing machine or multi-head sewing machine with rotating shuttle

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EP (1) EP2550387B1 (en)
JP (1) JP5828884B2 (en)
KR (1) KR101951200B1 (en)
CN (1) CN102918193B (en)
DE (1) DE102010013016A1 (en)
ES (1) ES2606033T3 (en)
TW (1) TWI530602B (en)
WO (1) WO2011116912A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013001346A1 (en) * 2013-01-28 2014-07-31 Zoje Europe Gmbh Embroidery machine with at least one lockstitch circular gripper

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JPH0451991A (en) * 1990-06-18 1992-02-20 Tokai Ind Sewing Mach Co Ltd Embroidery sewing machine
JPH04166187A (en) * 1990-10-31 1992-06-12 Juki Corp Rotary shuttle device for sewing machine
DE4217848C1 (en) * 1992-05-29 1993-06-24 G.M. Pfaff Ag, 6750 Kaiserslautern, De Sewing machine - has gripper mechanism which prevents jamming of the spool
US5839382A (en) * 1994-09-15 1998-11-24 Tice Engineering And Sales, Inc. Electronically geared sewing machine
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JPH10146487A (en) * 1996-11-19 1998-06-02 Brother Ind Ltd Sewing machine with spindle and rotating hook driven separately
JP3431800B2 (en) * 1997-03-28 2003-07-28 ブラザー工業株式会社 Multi-head sewing machine
DE19906433A1 (en) * 1999-02-12 2000-08-17 Hartmut Huelshoff Drive for feed units to move fabric on sewing or embroidery machines
JP4451561B2 (en) * 2000-11-07 2010-04-14 日本電波株式会社 Sewing machine with differential
US7143705B2 (en) * 2002-03-06 2006-12-05 L & P Property Management Company Multiple horizontal needle quilting machine and method
EP1597421A4 (en) * 2003-02-12 2007-01-17 Ralph J Koerner Quilting method and apparatus
CN200967877Y (en) * 2006-11-03 2007-10-31 中捷缝纫机股份有限公司 Differential feeding device for sewing machine
JP2008212383A (en) * 2007-03-05 2008-09-18 Brother Ind Ltd Sewing machine
CN201386195Y (en) * 2009-03-16 2010-01-20 中捷缝纫机股份有限公司 Backlash adjusting mechanism of lower shaft gear and transmission gear inside sewing machine

Also Published As

Publication number Publication date
KR20130009991A (en) 2013-01-24
EP2550387A2 (en) 2013-01-30
WO2011116912A2 (en) 2011-09-29
JP2013521957A (en) 2013-06-13
DE102010013016A1 (en) 2011-09-29
CN102918193A (en) 2013-02-06
WO2011116912A3 (en) 2012-04-05
ES2606033T3 (en) 2017-03-17
TW201139775A (en) 2011-11-16
KR101951200B1 (en) 2019-04-22
CN102918193B (en) 2015-06-10
JP5828884B2 (en) 2015-12-09
TWI530602B (en) 2016-04-21

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