EP2692925A1 - Thread pulling blade for a sewing machine, thread cutting module and sewing machine with such a thread pulling blade - Google Patents

Thread pulling blade for a sewing machine, thread cutting module and sewing machine with such a thread pulling blade Download PDF

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Publication number
EP2692925A1
EP2692925A1 EP13177798.9A EP13177798A EP2692925A1 EP 2692925 A1 EP2692925 A1 EP 2692925A1 EP 13177798 A EP13177798 A EP 13177798A EP 2692925 A1 EP2692925 A1 EP 2692925A1
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EP
European Patent Office
Prior art keywords
thread
knife
pulling knife
gripper
pulling
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Granted
Application number
EP13177798.9A
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German (de)
French (fr)
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EP2692925B1 (en
Inventor
Radomir Humplik
Christoph Heckner
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Duerkopp Adler AG
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Duerkopp Adler AG
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Publication of EP2692925A1 publication Critical patent/EP2692925A1/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread

Definitions

  • the invention relates to a thread-pulling knife for a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a thread trimming assembly and a sewing machine with such a thread-pulling knife.
  • a thread-pulling knife of the type mentioned is known from the EP 1 847 641 B1 , A thread trimmer for a zigzag stitch-producing sewing machine is described in U.S. Patent Nos. 4,178,055 US 4,455,957 , The US 4,879,960 discloses a thread cutting system for an inline chain stitch sewing machine.
  • Thread-pulling knives can be designed for sewing machines with grippers, which are rotatable about horizontal or vertical gripper axes.
  • the thread-pulling knife is regularly designed to cut both an upper thread and a looper thread, so that at the end of a seam formation both threads can be automatically cut off. If thick threads are to be sewn, which is often the case when sewing very resistant sewing material, the known thread-pulling knives sometimes no longer work reliably.
  • two separately arranged thread detection grooves for correspondingly separate detection of the upper thread on the one hand and the looper thread on the other hand offer the possibility of cutting both threads without the two threads converge uncontrolled when cutting and hinder each other in the worst case.
  • the separate thread detection enables a safe cutting of both threads even if thick thread types are used during sewing.
  • the thread-pulling knife pivot axis can run parallel to the gripper axis.
  • the thread detection grooves can open to the same direction.
  • the design of the thread-pulling knife for a sewing machine with a horizontally extending gripper axis is particularly suitable for a sewing machine designed for sewing heavy or durable material, for example leather or plastic plates.
  • An arrangement of the two thread-detecting grooves according to claim 2 allows due to the intermediate blade base body a compulsory separation of detection areas for the upper thread on the one hand and the looper thread on the other hand, resulting in a reliable thread detection.
  • a thread-pulling knife according to claim 3 allows a thread trimming close to a stitch pattern location, so that short thread ends remain on the fabric.
  • An arcuate design of the thread-pulling knife according to claim 4 ensures that a base body or a supporting body of the thread-pulling knife interfere with the yarn path as little as possible.
  • Staggered cutting edges of the thread-detecting grooves according to claim 5 reduce a maximum occurring cutting or shearing force when cutting the two threads.
  • Another object of the invention is to equip a sewing machine with such a thread-pulling knife.
  • the counter knife may be integrally provided with a common cutting edge which cooperates with the two bottom cutting edges of the thread detecting grooves, or may be equipped with two separately formed cutting edges each associated with the bottom cutting edge in the thread detecting groove. In the case of two separate cutting of the counter knife this can be carried out in two parts.
  • a sewing machine 1 has a base plate 2 with a stand 3 extending upward therefrom and an angled arm 4.
  • the sewing machine 1 is designed for sewing heavy or durable sewing material, for example leather or plastic plates.
  • the arm 4 ends in a head 5.
  • arm shaft 6 rotatably mounted.
  • This drives in the head 5, which is not set forth, a crank mechanism with a thread lever.
  • the crank mechanism is drivingly connected to a needle bar 9 axially slidably mounted in the head 5 in connection, of which in the Fig. 1 only a lower section is shown.
  • This has at its lower end a needle 10.
  • the needle 10 is moved up and down by the crank mechanism on a vertical axis 9a.
  • the needle 10 leads in an eye from a spool via a thread tensioning device and the thread lever supplied needle thread or upper thread 11, which is also shown only in sections in the drawing.
  • a gripper 12 which has a gripper body with a gripper tip 12a.
  • the gripper 12 is designed as a Barell gripper.
  • a cylindrical storage housing 12b is mounted for receiving a looper thread supply.
  • a cylinder axis of the storage housing 12b is perpendicular to a rotational axis of the gripper 12.
  • the storage housing 12b is designed to receive a bobbin.
  • the storage housing 12b is therefore also referred to as a coil housing.
  • the gripper 12 is rotatable about a horizontal gripper axis 13.
  • a gripper or lower thread 14 serves a Fadenabschneid assembly 15, which in the Fig. 2 in a thread trimming position and in the Fig. 3 is shown in a basic position.
  • the two threads 11, 14 have in the sewing of durable fabric a considerable thickness, which may be, for example, 1 mm and more.
  • the Fadenabschneid assembly 15 has a movable between the Fadenabschneid too and the basic position thread-pulling knife 16 and a fixed to a frame, so for example the base plate 2, the sewing machine 1 connected counter knife 17. Between the basic position and the Fadenabschneid ein is a thread detection position of the thread pulling knife 16. Das The thread-pulling knife 16 is pivotable adjacent to the gripper 12 and to the spool housing 12b.
  • the thread-pulling knife 16 is arcuately executed about a pivot axis 18 about which the thread-pulling knife 16 of the displacement between the basic position and the Fadenabschneid ein is pivotable.
  • the thread-pulling knife 16 has an arc-shaped carrier body 19, with which a likewise curved knife body 20 of the thread-pulling knife 16 is screwed by means of a mounting bracket 21.
  • the carrier body 19 is arcuately formed so that it is arranged in the assembled basic position around the gripper 12 around.
  • the thread-pulling knife carrier body 19 is rotatably connected to a blade shaft 22 which extends along the pivot axis 18 in the base plate 2 parallel to the arm shaft 6.
  • a pivot axis of the thread-pulling knife carrier body 19 extends parallel to the gripper axis 13.
  • the gripper axis is vertical.
  • the pivot axis of the thread-pulling knife carrier body is vertical.
  • the arrangement of the thread-pulling knife 16 and the counter knife 17 is rotated in the case of a vertical gripper axis by 90 ° so that the cutting edges of the thread-pulling knife 16 and the counter blade 17 cooperating with each other during thread cutting are substantially vertical in this alternative embodiment.
  • the blade shaft 22 is mechanically coupled to a blade drive shaft 24, which is also housed parallel to the arm shaft 6, at the transition between the stator 3 and the arm 4.
  • a drive movement of the knife drive shaft 24 is derived from the arm shaft 6 via a cam 24 a, which is rotatably connected to the arm shaft 6.
  • a lift cylinder 24b provides controlled displacement of the thread trimmer mechanism between a neutral position, in which the cam disc 24a remains ineffective, and a thread trimmer operating position in which the cam plate 24a acts to drive a cutting movement of the thread pulling knife 16.
  • the thread-pulling knife 16 has two separately arranged thread-detecting grooves 25, 26, each having a cutting edge with respective cutting edge 26a.
  • the cutting edges 26a represent edge transitions between the thread-detecting grooves 25 and 26 on the one hand and an upper side of the thread-pulling knife 16 on the other hand Fig. 3
  • Thread detection groove 26 shown above is used to detect the upper thread 11 and in the Fig. 3
  • the thread detection groove 25 shown below is used to detect the lower thread 14.
  • the two thread detection grooves 25, 26 are arranged on both sides of a knife base 27 of the thread pulling knife 16.
  • the two thread-detecting grooves 25 and 26 open to the same direction, namely, as seen from a free end of the thread pulling knife 16 in the basic position, in the direction of movement of the thread pulling knife 16 for thread detection position and the cutting position.
  • the counter-blade 17 is adjustably screwed in position with a bearing block 28, which in turn is bolted to the frame of the sewing machine 1.
  • the thread clamp 29 clamps the bobbin-side lower thread 14, which is pulled around the thread pulling knife 16 during cutting, after cutting, so that its position remains defined after deposition. This facilitates sewing and prevents a loose end of the lower thread 14 from entering a later trajectory of the gripper.
  • FIG. 5 The exploded view after Fig. 5 further shows a screw 30 with countersunk head for attachment of the counter blade 17 to an upper bearing surface 31 of the bearing block 28.
  • the screw 30 is screwed for this purpose in a thread 32, which is executed in the contact surface 31.
  • a ball cap 33 is arranged, which is designed to match a conical socket 34 in a screw passage opening 35 of the counter blade 17.
  • a threaded pin 36 is arranged for adjusting the counter blade 17.
  • a cutting relative position of a cutting edge 38 of the counter blade 17 to the cutting edges 26a of the thread pulling knife 16 can be specified.
  • a cutting pressure during the thread cutting between the cutting edges 26a and 38 is generated by a radius of the knife main body 27 rising to the cutting point in the region of the thread-detecting grooves 25, 26.
  • the sewing machine 1 operates as follows: In the normal sewing operation, the thread-pulling knife 16 is in the home position. With the help of the gripper and the needle 10 in a known manner looping and knotting of looper thread 14 and needle thread 11 for seam formation. At the end of the seaming operation, a thread trimming operation is initiated for both threads 11, 14. For this purpose, a knife drive is actuated, via the knife drive shaft 24, the pull rod 23, the knife shaft 22, a pivoting of the thread pulling knife 16 from the basic position in the Thread trimming position causes. Here, the thread-pulling knife 16 passes through the thread-detecting position, in which the thread-detecting groove 25, the upper thread 11 and the thread-detecting groove 26 detects the lower thread 14.
  • the counter knife 17 With covered in the grooves 25, 26 threads 11, 14, the counter knife 17 then reaches the Fadenabschneidleton in which the threads 11, 14 between the cutting edges 26a of the thread pulling knife 16 and the cutting edge 38 of the counter blade 17 are sheared.
  • the thread-pulling knife 16 then returns, again driven by the components 22 to 24, in the normal position.
  • FIGS. 7 and 8 Two further embodiments of a thread trimming assembly with a thread-pulling knife and a counter knife are explained below. Components corresponding to those described above with reference to the thread trimming assembly according to the Fig. 1 to 6 already described, bear the same reference numbers and will not be discussed again in detail.
  • the cutting edge 38 of the counter blade 17 is inclined relative to a connecting line 39 between the two cutting edges 26a of the thread-detecting grooves 25, 26.
  • the counter knife cutting edge 38 encloses an angle ⁇ of 8 ° with the connecting line 39 in the area of the thread cutting position.
  • the execution after Fig. 7 closes the cutting edge 38 of the counter blade 17 with a movement direction 40 of Fadenabschneid movement of the thread-pulling knife 16 relative to the counter blade 17 a right angle.
  • the oblique course of the counter knife cutting edge 38 to the connecting line 39 of the two cutting edges 26a is thus due to the fact that the two cutting edges 26a of the thread detection grooves 25, 26 are arranged offset in the direction of movement 40 to each other. In absolute terms, this offset can be, for example, in the range of 1 mm to 2 mm.
  • the counter-blade cutting edge 38 is not perpendicular to the direction of movement 40 of the thread-pulling knife 16, but takes this to a minimum angle ⁇ , which is smaller than 88 ° and in the illustrated embodiment is about 78 °.
  • the thread-pulling knife 16 is in the execution after Fig. 8 also with regard to the arrangement of the cutting edges 26 a executed exactly as the thread-pulling knife 16 after Fig. 6 , The cutting edges 26a are after the thread-pulling knife 16 after Fig. 8 in the direction of movement 40 so not offset from each other.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The thread drawing blade is pivoted between a basic position and a thread spinning position centering on a pivot axis. A blade main portion is provided with the thread spinning channels and a cutting blade. The blade main portion is provided for supporting the supply housing for receiving untwisted yarn supply. The thread spinning channels are positioned separately. A hook shaft is extended in a horizontal direction of the blade main portion. The thread spinning channels are arranged on both sides of a blade base.

Description

Der Inhalt der deutschen Patentanmeldung 10 2012 213 599.5 wird durch Bezugnahme hierin aufgenommen.The content of the German patent application 10 2012 213 599.5 is incorporated herein by reference.

Die Erfindung betrifft ein Fadenziehmesser für eine Nähmaschine nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung eine Fadenabschneid-Baugruppe sowie eine Nähmaschine mit einem derartigen Fadenziehmesser.The invention relates to a thread-pulling knife for a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a thread trimming assembly and a sewing machine with such a thread-pulling knife.

Ein Fadenziehmesser der eingangs genannten Art ist bekannt aus der EP 1 847 641 B1 . Einen Fadenabschneider für eine einen Zick-Zack-Stich erzeugende Nähmaschine ist beschrieben in der US 4,455,957 . Die US 4,879,960 offenbart ein Fadenabschneidsystem für eine Inline Kettenstich-Nähmaschine.A thread-pulling knife of the type mentioned is known from the EP 1 847 641 B1 , A thread trimmer for a zigzag stitch-producing sewing machine is described in U.S. Patent Nos. 4,178,055 US 4,455,957 , The US 4,879,960 discloses a thread cutting system for an inline chain stitch sewing machine.

Fadenziehmesser können für Nähmaschinen mit Greifern gestaltet werden, die um horizontal oder vertikal verlaufende Greiferachsen drehbar sind. Das Fadenziehmesser ist regelmäßig zum Abschneiden sowohl eines Oberfadens als auch eines Greiferfadens gestaltet, so dass am Ende einer Nahtbildung beide Fäden automatisch abgeschnitten werden können. Sofern dicke Fäden vernäht werden sollen, was beim Vernähen von sehr widerstandsfähigem Nähgut oftmals der Fall ist, arbeiten die bekannten Fadenziehmesser mitunter nicht mehr betriebssicher.Thread-pulling knives can be designed for sewing machines with grippers, which are rotatable about horizontal or vertical gripper axes. The thread-pulling knife is regularly designed to cut both an upper thread and a looper thread, so that at the end of a seam formation both threads can be automatically cut off. If thick threads are to be sewn, which is often the case when sewing very resistant sewing material, the known thread-pulling knives sometimes no longer work reliably.

Es ist daher eine Aufgabe der vorliegenden Erfindung, ein Fadenziehmesser der eingangs genannten Art sowie eine hiermit ausgerüstete Fadenabschneid-Baugruppe derart weiterzubilden, dass es betriebssicher auch bei dicken abzuschneidenden Fadentypen arbeitet.It is therefore an object of the present invention, a thread-pulling knife of the type mentioned above and a thread trimming assembly equipped therewith in such a way that it works reliably even with thick types of thread to be cut off.

Diese Aufgabe ist erfindungsgemäß gelöst durch ein Fadenziehmesser mit den im Anspruch 1 angegebenen Merkmalen.This object is achieved by a thread-pulling knife with the features specified in claim 1.

Erfindungsgemäß wurde erkannt, dass zwei voneinander getrennt angeordnete Fadenerfassungs-Nuten zur entsprechend getrennten Erfassung des Oberfadens einerseits und des Greiferfadens andererseits die Möglichkeit eines Abschneidens beider Fäden bieten, ohne dass die beiden Fäden unkontrolliert beim Abschneiden zusammenlaufen und einander im ungünstigen Fall behindern. Die getrennte Fadenerfassung ermöglicht ein sicheres Abschneiden beider Fäden auch dann, wenn dicke Fadentypen beim Nähen zum Einsatz kommen. Die Fadenziehmesser-Schwenkachse kann parallel zur Greiferachse verlaufen. Die Fadenerfassungs-Nuten können sich zur gleichen Richtung hin öffnen. Die Ausgestaltung des Fadenziehmessers für eine Nähmaschine mit horizontal verlaufender Greiferachse eignet sich insbesondere für eine Nähmaschine, die zum Vernähen von schwerem bzw. widerstandfähigem Nähgut ausgelegt ist, zum Beispiel von Leder oder von Kunststoffplatten.According to the invention, it has been recognized that two separately arranged thread detection grooves for correspondingly separate detection of the upper thread on the one hand and the looper thread on the other hand offer the possibility of cutting both threads without the two threads converge uncontrolled when cutting and hinder each other in the worst case. The separate thread detection enables a safe cutting of both threads even if thick thread types are used during sewing. The thread-pulling knife pivot axis can run parallel to the gripper axis. The thread detection grooves can open to the same direction. The design of the thread-pulling knife for a sewing machine with a horizontally extending gripper axis is particularly suitable for a sewing machine designed for sewing heavy or durable material, for example leather or plastic plates.

Eine Anordnung der beiden Fadenerfassungs-Nuten nach Anspruch 2 ermöglicht aufgrund des zwischenliegenden Messer-Grundkörpers eine zwangsweise Trennung von Erfassungsbereichen für den Oberfaden einerseits und den Greiferfaden andererseits, was zu einer betriebssicheren Fadenerfassung führt.An arrangement of the two thread-detecting grooves according to claim 2 allows due to the intermediate blade base body a compulsory separation of detection areas for the upper thread on the one hand and the looper thread on the other hand, resulting in a reliable thread detection.

Ein Fadenziehmesser nach Anspruch 3 ermöglicht ein Fadenabschneiden nahe an einer Stichbildestelle, sodass kurze Fadenenden am Nähgut verbleiben.A thread-pulling knife according to claim 3 allows a thread trimming close to a stitch pattern location, so that short thread ends remain on the fabric.

Eine bogenförmige Gestaltung des Fadenziehmessers nach Anspruch 4 stellt sicher, dass ein Grundkörper bzw. ein Tragkörper des Fadenziehmessers den Fadenlauf möglichst wenig stören.An arcuate design of the thread-pulling knife according to claim 4 ensures that a base body or a supporting body of the thread-pulling knife interfere with the yarn path as little as possible.

Versetzte Schneidkanten der Fadenerfassungs-Nuten nach Anspruch 5 verringern eine maximal auftretende Schneid- bzw. Scherkraft beim Abschneiden der beiden Fäden.Staggered cutting edges of the thread-detecting grooves according to claim 5 reduce a maximum occurring cutting or shearing force when cutting the two threads.

Die Vorteile einer Fadenabschneid-Baugruppe nach Anspruch 6 entsprechen denen, die vorstehend unter Bezugnahme auf das erfindungsgemäße Fadenziehmesser bereits erläutert wurden.The advantages of a thread trimming assembly according to claim 6 correspond to those which have already been explained above with reference to the thread-pulling knife according to the invention.

Bei den Gestaltungsvarianten der Fadenabschneid-Baugruppe nach den Ansprüchen 7 und 8 ergibt sich eine Verringerung einer maximalen Schneid- bzw. Scherkraft beim Abschneiden der beiden Fäden.In the design variants of the thread trimming assembly according to claims 7 and 8 results in a reduction of a maximum cutting or shearing force when cutting the two threads.

Eine weitere Aufgabe der Erfindung ist es, eine Nähmaschine mit einem derartigen Fadenziehmesser auszurüsten.Another object of the invention is to equip a sewing machine with such a thread-pulling knife.

Diese Aufgabe ist erfindungsgemäß gelöst durch eine Nähmaschine mit dem im Anspruch 9 angegebenen Merkmalen.This object is achieved by a sewing machine with the features specified in claim 9.

Die Vorteile der erfindungsgemäßen Nähmaschine entsprechen denen, die vorstehend unter Bezugnahme auf das erfindungsgemäße Fadenmesser bereits erläutert wurden.The advantages of the sewing machine according to the invention correspond to those which have already been explained above with reference to the thread knife according to the invention.

Das Gegenmesser kann einteilig mit einer gemeinsamen Schneide, die mit den beiden bodenseitigen Schneiden der Fadenerfassungs-Nuten zusammenwirkt, oder kann mit zwei separat ausgebildeten Schneiden, die jeweils der bodenseitigen Schneide in der Fadenerfassungs-Nut zugeordnet sind, ausgerüstet sein. Im Falle zweier separater Schneiden des Gegenmessers kann dieses insgesamt zweiteilig ausgeführt sein.The counter knife may be integrally provided with a common cutting edge which cooperates with the two bottom cutting edges of the thread detecting grooves, or may be equipped with two separately formed cutting edges each associated with the bottom cutting edge in the thread detecting groove. In the case of two separate cutting of the counter knife this can be carried out in two parts.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:

Fig. 1
eine bedienerseitige perspektivische Ansicht einer Nähmaschine;
Fig. 2
perspektivisch und vergrößert eine FadenabschneidBaugruppe der Nähmaschine nach Fig. 1, wobei ein Fadenziehmesser relativ zu einem Gegenmesser in einer Fadenabschneid-Stellung dargestellt ist;
Fig. 3
eine weitere perspektivische Darstellung der FadenabschneidBaugruppe nach Fig. 2, dargestellt in einer Grundstellung des Fadenziehmessers relativ zum Gegenmesser;
Fig. 4
in einer weiteren Perspektive die Fadenabschneid-Baugruppe nach Fig. 2 in der Fadenabschneid-Stellung;
Fig. 5
eine Explosionsdarstellung von Gegenmesser-Komponenten der Fadenabschneid-Baugruppe;
Fig. 6
eine Aufsicht auf die Fadenabschneid-Baugruppe mit dem Fadenziehmesser und dem Gegenmesser in einer Relativstellung vor der Fadenabschneid-Stellung; und
Fig. 7 und 8
in zur Fig. 6 ähnlichen Darstellungen zwei weitere Ausführungen einer Fadenabschneid-Baugruppe, wobei jeweils eine Schneidkante des Gegenmessers relativ zu einer Verbindungslinie zwischen Schneidkanten von Fadenerfassungs-Nuten des Fadenziehmessers schräg verläuft.
An embodiment of the invention will be explained in more detail with reference to the drawing. In this show:
Fig. 1
a user-side perspective view of a sewing machine;
Fig. 2
perspective and enlarged by a FadenabschneidBaugruppe the sewing machine after Fig. 1 wherein a thread-pulling knife is illustrated relative to a counter knife in a thread cutting position;
Fig. 3
a further perspective view of the FadenabschneidBaugruppe after Fig. 2 , shown in a basic position of the thread-pulling knife relative to the counter-blade;
Fig. 4
in a further perspective the thread trimming assembly after Fig. 2 in the thread trimming position;
Fig. 5
an exploded view of counter knife components of the thread trimming assembly;
Fig. 6
a plan view of the thread trimming assembly with the thread-pulling knife and the counter blade in a relative position before the Fadenabschneid position; and
FIGS. 7 and 8
in to Fig. 6 two similar embodiments of a thread trimming assembly, wherein in each case a cutting edge of the counter knife is inclined relative to a connecting line between cutting edges of thread-detecting grooves of the thread-pulling knife.

Eine Nähmaschine 1 hat eine Grundplatte 2 mit einem sich davon aufwärts erstreckenden Ständer 3 und einem abgewinkelten Arm 4. Die Nähmaschine 1 ist ausgelegt zum Vernähen von schwerem bzw. widerstandsfähigem Nähgut, zum Beispiel von Leder oder Kunststoffplatten.A sewing machine 1 has a base plate 2 with a stand 3 extending upward therefrom and an angled arm 4. The sewing machine 1 is designed for sewing heavy or durable sewing material, for example leather or plastic plates.

Der Arm 4 endet in einem Kopf 5. In dem Arm 4 ist eine in der Fig. 1 abschnittsweise dargestellte Armwelle 6 drehbar gelagert. Diese treibt in dem Kopf 5, was nicht näher gestellt ist, einen Kurbeltrieb mit einem Fadenhebel an. Der Kurbeltrieb steht antriebsmäßig mit einer in dem Kopf 5 axial verschiebbar gelagerten Nadelstange 9 in Verbindung, von der in der Fig. 1 ausschließlich ein unterer Abschnitt dargestellt ist. Diese hat an ihrem unteren Ende eine Nadel 10. Die Nadel 10 ist durch den Kurbeltrieb auf einer vertikalen Achse 9a auf- und abbewegbar. Die Nadel 10 führt in einem Öhr einen von einer Spule über eine Fadenspannvorrichtung und den Fadenhebel zugeführten Nadelfaden bzw. Oberfaden 11, der in der Zeichnung ebenfalls nur abschnittsweise dargestellt ist.The arm 4 ends in a head 5. In the arm 4 is a in the Fig. 1 partially shown arm shaft 6 rotatably mounted. This drives in the head 5, which is not set forth, a crank mechanism with a thread lever. The crank mechanism is drivingly connected to a needle bar 9 axially slidably mounted in the head 5 in connection, of which in the Fig. 1 only a lower section is shown. This has at its lower end a needle 10. The needle 10 is moved up and down by the crank mechanism on a vertical axis 9a. The needle 10 leads in an eye from a spool via a thread tensioning device and the thread lever supplied needle thread or upper thread 11, which is also shown only in sections in the drawing.

Unterhalb einer Auflageplatte, die in der Zeichnung nicht dargestellt und in einer Ausnehmung 11a der Grundplatte 2 montiert ist, befindet sich ein Greifer 12, der einen Greiferkörper mit einer Greiferspitze 12a aufweist. Der Greifer 12 ist als Barell-Greifer ausgeführt. In dem Greiferkörper ist ein zylindrisches Vorratsgehäuse 12b zur Aufnahme eines Greiferfadenvorrats gelagert. Eine Zylinderachse des Vorratsgehäuses 12b verläuft senkrecht zu einer Drehachse des Greifers 12. Das Vorratsgehäuse 12b ist zur Aufnahme einer Unterfadenspule ausgeführt. Das Vorratsgehäuse 12b wird daher auch als Spulengehäuse bezeichnet.Below a support plate, which is not shown in the drawing and mounted in a recess 11a of the base plate 2, there is a gripper 12, which has a gripper body with a gripper tip 12a. The gripper 12 is designed as a Barell gripper. In the gripper body, a cylindrical storage housing 12b is mounted for receiving a looper thread supply. A cylinder axis of the storage housing 12b is perpendicular to a rotational axis of the gripper 12. The storage housing 12b is designed to receive a bobbin. The storage housing 12b is therefore also referred to as a coil housing.

Der Greifer 12 ist um eine horizontale Greiferachse 13 drehbar.The gripper 12 is rotatable about a horizontal gripper axis 13.

Zum Abschneiden sowohl des Oberfadens 11 als auch eines Greifer- bzw. Unterfadens 14 (vgl. Fig. 3) dient eine Fadenabschneid-Baugruppe 15, die in der Fig. 2 in einer Fadenabschneidstellung und in der Fig. 3 in einer Grundstellung dargestellt ist. Die beiden Fäden 11, 14 haben bei der Vernähung von widerstandsfähigem Nähgut eine erhebliche Dicke, die beispielsweise 1 mm und mehr betragen kann.For cutting both the upper thread 11 and a gripper or lower thread 14 (see. Fig. 3 ) serves a Fadenabschneid assembly 15, which in the Fig. 2 in a thread trimming position and in the Fig. 3 is shown in a basic position. The two threads 11, 14 have in the sewing of durable fabric a considerable thickness, which may be, for example, 1 mm and more.

Die Fadenabschneid-Baugruppe 15 hat ein zwischen der Fadenabschneidstellung und der Grundstellung verlagerbares Fadenziehmesser 16 und ein fest mit einem Rahmen, also beispielsweise der Grundplatte 2, der Nähmaschine 1 verbundenes Gegenmesser 17. Zwischen der Grundstellung und der Fadenabschneidstellung liegt eine Fadenerfassungsstellung des Fadenziehmessers 16. Das Fadenziehmesser 16 ist benachbart zum Greifer 12 und zum Spulengehäuse 12b verschwenkbar.The Fadenabschneid assembly 15 has a movable between the Fadenabschneidstellung and the basic position thread-pulling knife 16 and a fixed to a frame, so for example the base plate 2, the sewing machine 1 connected counter knife 17. Between the basic position and the Fadenabschneidstellung is a thread detection position of the thread pulling knife 16. Das The thread-pulling knife 16 is pivotable adjacent to the gripper 12 and to the spool housing 12b.

Das Fadenziehmesser 16 ist bogenförmig um eine Schwenkachse 18 ausgeführt, um die das Fadenziehmesser 16 der Verlagerung zwischen der Grundstellung und der Fadenabschneidstellung verschwenkbar ist. Das Fadenziehmesser 16 hat einen bogenförmigen Trägerkörper 19, mit dem ein ebenfalls bogenförmiger Messerkörper 20 des Fadenziehmessers 16 über einen Montageausleger 21 verschraubt ist. Der Trägerkörper 19 ist bogenförmig so ausgebildet, dass er in montierter Grundstellung um den Greifer 12 herum angeordnet ist.The thread-pulling knife 16 is arcuately executed about a pivot axis 18 about which the thread-pulling knife 16 of the displacement between the basic position and the Fadenabschneidstellung is pivotable. The thread-pulling knife 16 has an arc-shaped carrier body 19, with which a likewise curved knife body 20 of the thread-pulling knife 16 is screwed by means of a mounting bracket 21. The carrier body 19 is arcuately formed so that it is arranged in the assembled basic position around the gripper 12 around.

Der Fadenziehmesser-Trägerkörper 19 ist drehfest mit einer Messerwelle 22 verbunden, die längs der Schwenkachse 18 in der Grundplatte 2 parallel zur Armwelle 6 verläuft. Eine Schwenkachse des Fadenziehmesser-Trägerkörpers 19 verläuft parallel zur Greiferachse 13. Dies ist auch bei einer alternativen, nicht dargestellten Ausführung so, bei der die Greiferachse vertikal verläuft. In diesem Fall verläuft auch die Schwenkachse des Fadenziehmesser-Trägerkörpers vertikal. Die Anordnung des Fadenziehmessers 16 und des Gegenmessers 17 ist im Falle einer vertikalen Greiferachse um 90° so gedreht, dass die beim Fadenabschneiden miteinander zusammenwirkenden Schneidkanten des Fadenziehmessers 16 und des Gegenmessers 17 bei dieser alternativen Ausführung im Wesentlichen vertikal verlaufen.The thread-pulling knife carrier body 19 is rotatably connected to a blade shaft 22 which extends along the pivot axis 18 in the base plate 2 parallel to the arm shaft 6. A pivot axis of the thread-pulling knife carrier body 19 extends parallel to the gripper axis 13. This is also in an alternative, not shown embodiment in which the gripper axis is vertical. In this case, the pivot axis of the thread-pulling knife carrier body is vertical. The arrangement of the thread-pulling knife 16 and the counter knife 17 is rotated in the case of a vertical gripper axis by 90 ° so that the cutting edges of the thread-pulling knife 16 and the counter blade 17 cooperating with each other during thread cutting are substantially vertical in this alternative embodiment.

Über eine Zugstange 23 ist die Messerwelle 22 mechanisch an eine Messer-Antriebswelle 24 angekoppelt, die, ebenfalls parallel zur Armwelle 6 verlaufend, am Übergang zwischen dem Ständer 3 und dem Arm 4 untergebracht ist. Eine Antriebsbewegung der Messer-Antriebswelle 24 wird von der Armwelle 6 über eine Kurvenscheibe 24a abgeleitet, die drehfest mit der Armwelle 6 verbunden ist. Ein Hubzylinder 24b sorgt für ein gesteuertes Verlagern der Fadenabschneidermechanik zwischen einer Neutralstellung, in der die Kurvenscheibe 24a wirkungslos bleibt, und einer Fadenabschneider-Betriebstellung, in der die Kurvenscheibe 24a zum Antrieb einer Schneidbewegung des Fadenziehmessers 16 wirkt.About a pull rod 23, the blade shaft 22 is mechanically coupled to a blade drive shaft 24, which is also housed parallel to the arm shaft 6, at the transition between the stator 3 and the arm 4. A drive movement of the knife drive shaft 24 is derived from the arm shaft 6 via a cam 24 a, which is rotatably connected to the arm shaft 6. A lift cylinder 24b provides controlled displacement of the thread trimmer mechanism between a neutral position, in which the cam disc 24a remains ineffective, and a thread trimmer operating position in which the cam plate 24a acts to drive a cutting movement of the thread pulling knife 16.

Das Fadenziehmesser 16 hat zwei voneinander getrennt angeordnete Fadenerfassungs-Nuten 25, 26 mit jeweils einer Schneide mit jeweiliger Schneidkante 26a. Die Schneidkanten 26a stellen Kantenübergänge zwischen den Fadenerfassungs-Nuten 25 und 26 einerseits und einer Oberseite des Fadenziehmessers 16 andererseits dar. Die in der Fig. 3 oben dargestellte Fadenerfassungs-Nut 26 dient zur Erfassung des Oberfadens 11 und die in der Fig. 3 unten dargestellte Fadenerfassungs-Nut 25 dient zur Erfassung des Unterfadens 14. Die beiden Fadenerfassungs-Nuten 25, 26 sind beiderseits eines Messer-Grundkörpers 27 des Fadenziehmessers 16 angeordnet.The thread-pulling knife 16 has two separately arranged thread-detecting grooves 25, 26, each having a cutting edge with respective cutting edge 26a. The cutting edges 26a represent edge transitions between the thread-detecting grooves 25 and 26 on the one hand and an upper side of the thread-pulling knife 16 on the other hand Fig. 3 Thread detection groove 26 shown above is used to detect the upper thread 11 and in the Fig. 3 The thread detection groove 25 shown below is used to detect the lower thread 14. The two thread detection grooves 25, 26 are arranged on both sides of a knife base 27 of the thread pulling knife 16.

Die beiden Fadenerfassungs-Nuten 25 und 26 öffnen sich zur gleichen Richtung hin, nämlich, gesehen von einem freien Ende des Fadenziehmessers 16 in der Grundstellung aus, hin in Bewegungsrichtung des Fadenziehmessers 16 zur Fadenerfassungsstellung und zur Schneidstellung.The two thread-detecting grooves 25 and 26 open to the same direction, namely, as seen from a free end of the thread pulling knife 16 in the basic position, in the direction of movement of the thread pulling knife 16 for thread detection position and the cutting position.

Das Gegenmesser 17 ist in seiner Position einstellbar mit einem Lagerbock 28 verschraubt, der wiederum mit dem Rahmen der Nähmaschine 1 fest verschraubt ist. Mit dem Lagerbock 28 weiterhin verschraubt ist eine Fadenklemme 29. Die Fadenklemme 29 klemmt den spulenseitigen Unterfaden 14, der beim Abschneiden um das Fadenziehmesser 16 herumgezogen wird, nach dem Abschneiden, damit dessen Position nach dem Abscheiden definiert bleibt. Dies erleichtert das Annähen und verhindert, dass ein loses Ende des Unterfadens 14 in eine spätere Bewegungsbahn des Greifers gelangt.The counter-blade 17 is adjustably screwed in position with a bearing block 28, which in turn is bolted to the frame of the sewing machine 1. The thread clamp 29 clamps the bobbin-side lower thread 14, which is pulled around the thread pulling knife 16 during cutting, after cutting, so that its position remains defined after deposition. This facilitates sewing and prevents a loose end of the lower thread 14 from entering a later trajectory of the gripper.

Die Explosionsdarstellung nach Fig. 5 zeigt weiterhin eine Schraube 30 mit Senkkopf zur Befestigung des Gegenmessers 17 an einer oberen Anlagefläche 31 des Lagerbocks 28. Die Schraube 30 wird hierzu in ein Gewinde 32 eingeschraubt, das in der Anlagefläche 31 ausgeführt ist. Zwischen der Schraube 30 und dem Gegenmesser 17 ist noch eine Kugelkappe 33 angeordnet, die passend zu einer Kegelpfanne 34 in einer Schrauben-Durchtrittsöffnung 35 des Gegenmessers 17 ausgeführt ist.The exploded view after Fig. 5 further shows a screw 30 with countersunk head for attachment of the counter blade 17 to an upper bearing surface 31 of the bearing block 28. The screw 30 is screwed for this purpose in a thread 32, which is executed in the contact surface 31. Between the screw 30 and the counter blade 17 is still a ball cap 33 is arranged, which is designed to match a conical socket 34 in a screw passage opening 35 of the counter blade 17.

Zwischen dem Gegenmesser 17 und der Anlagefläche 31 ist ein Gewindestift 36 zur Einstellung des Gegenmessers 17 angeordnet. Je nach Einschraubtiefe des Gewindestiftes 36 in einer weiteren Gewindebohrung 37 in der Anlagefläche 31 des Lagerbocks 28 kann eine Schneid-Relativposition einer Schneidkante 38 des Gegenmessers 17 zu den Schneidkanten 26a des Fadenziehmessers 16 vorgegeben werden.Between the counter blade 17 and the contact surface 31, a threaded pin 36 is arranged for adjusting the counter blade 17. Depending on the depth of thread of the threaded pin 36 in a further threaded bore 37 in the contact surface 31 of the bearing block 28, a cutting relative position of a cutting edge 38 of the counter blade 17 to the cutting edges 26a of the thread pulling knife 16 can be specified.

Ein Schneiddruck beim Fadenabschneiden zwischen den Schneidkanten 26a und 38 wird durch einen bis zum Schneidpunkt ansteigenden Radius des Messer-Grundkörpers 27 im Bereich der Fadenerfassungs-Nuten 25, 26 erzeugt.A cutting pressure during the thread cutting between the cutting edges 26a and 38 is generated by a radius of the knife main body 27 rising to the cutting point in the region of the thread-detecting grooves 25, 26.

Die Nähmaschine 1 arbeitet folgendermaßen: Im normalen Nähbetrieb ist das Fadenziehmesser 16 in der Grundstellung. Mit Hilfe des Greifers und der Nadel 10 erfolgen in bekannter Weise eine Schlingenbildung und eine Verknotung von Greiferfaden 14 und Nadelfaden 11 zur Nahtbildung. Am Ende des Nahtbildungsvorgangs wird ein Fadenabschneidvorgang für beide Fäden 11, 14 eingeleitet. Hierzu wird ein Messerantrieb betätigt, der über die Messer-Antriebswelle 24, die Zugstange 23, die Messerwelle 22 eine Verschwenkung des Fadenziehmessers 16 aus der Grundstellung in die Fadenabschneidstellung bewirkt. Hierbei durchläuft das Fadenziehmesser 16 die Fadenerfassungsstellung, bei der die Fadenerfassungs-Nut 25 den Oberfaden 11 und die Fadenerfassungs-Nut 26 den Unterfaden 14 erfasst.The sewing machine 1 operates as follows: In the normal sewing operation, the thread-pulling knife 16 is in the home position. With the help of the gripper and the needle 10 in a known manner looping and knotting of looper thread 14 and needle thread 11 for seam formation. At the end of the seaming operation, a thread trimming operation is initiated for both threads 11, 14. For this purpose, a knife drive is actuated, via the knife drive shaft 24, the pull rod 23, the knife shaft 22, a pivoting of the thread pulling knife 16 from the basic position in the Thread trimming position causes. Here, the thread-pulling knife 16 passes through the thread-detecting position, in which the thread-detecting groove 25, the upper thread 11 and the thread-detecting groove 26 detects the lower thread 14.

Aufgrund der separaten, voneinander getrennten Anordnung der beiden Fadenerfassungs-Nuten 25, 26 für die beiden Fäden 11, 14 wird verhindert, dass sich die beiden Fäden 11, 14 in den Fadenerfassungs-Nuten 25, 26 gegenseitig behindern.Due to the separate, separate arrangement of the two thread-detecting grooves 25, 26 for the two threads 11, 14 prevents the two threads 11, 14 in the thread-detecting grooves 25, 26 hinder each other.

Mit in den Nuten 25, 26 erfassten Fäden 11, 14 erreicht das Gegenmesser 17 dann die Fadenabschneidstellung, in der die Fäden 11, 14 zwischen den Schneidkanten 26a des Fadenziehmessers 16 und der Schneidkante 38 des Gegenmesser 17 abgeschert werden. Das Fadenziehmesser 16 kehrt dann, wiederum angetrieben über die Komponenten 22 bis 24, in die Grundstellung zurück.With covered in the grooves 25, 26 threads 11, 14, the counter knife 17 then reaches the Fadenabschneidstellung in which the threads 11, 14 between the cutting edges 26a of the thread pulling knife 16 and the cutting edge 38 of the counter blade 17 are sheared. The thread-pulling knife 16 then returns, again driven by the components 22 to 24, in the normal position.

Anhand der Fig. 7 und 8 werden nachfolgend zwei weitere Ausführungen einer Fadenabschneid-Baugruppe mit einem Fadenziehmesser und einem Gegenmesser erläutert. Komponenten, die denjenigen entsprechen, die vorstehend unter Bezugnahme auf die Fadenabschneid-Baugruppe nach den Fig. 1 bis 6 bereits erläutert wurden, tragen die gleichen Bezugsziffern und werden nicht nochmals im Einzelnen diskutiert.Based on FIGS. 7 and 8 Two further embodiments of a thread trimming assembly with a thread-pulling knife and a counter knife are explained below. Components corresponding to those described above with reference to the thread trimming assembly according to the Fig. 1 to 6 already described, bear the same reference numbers and will not be discussed again in detail.

Bei der Ausführung nach Fig. 7 verläuft die Schneidkante 38 des Gegenmessers 17 relativ zu einer Verbindungslinie 39 zwischen den beiden Schneidkanten 26a der Fadenerfassungs-Nuten 25, 26 schräg. Die Gegenmesser-Schneidkante 38 schließt dabei mit der Verbindungslinie 39 im Bereich der Fadenabschneid-Stellung einen Winkel β von 8° ein. Bei der Ausführung nach Fig. 7 schließt die Schneidkante 38 des Gegenmessers 17 mit einer Bewegungsrichtung 40 der Fadenabschneid-Bewegung des Fadenziehmessers 16 relativ zum Gegenmesser 17 einen rechten Winkel ein. Der Schrägverlauf der Gegenmesser-Schneidkante 38 zur Verbindungslinie 39 der beiden Schneidkanten 26a ist also dadurch bedingt, dass die beiden Schneidkanten 26a der Fadenerfassungs-Nuten 25, 26 in der Bewegungsrichtung 40 zueinander versetzt angeordnet sind. Absolut kann dieser Versatz beispielsweise im Bereich von 1 mm bis 2 mm liegen.In the execution after Fig. 7 the cutting edge 38 of the counter blade 17 is inclined relative to a connecting line 39 between the two cutting edges 26a of the thread-detecting grooves 25, 26. The counter knife cutting edge 38 encloses an angle β of 8 ° with the connecting line 39 in the area of the thread cutting position. In the execution after Fig. 7 closes the cutting edge 38 of the counter blade 17 with a movement direction 40 of Fadenabschneid movement of the thread-pulling knife 16 relative to the counter blade 17 a right angle. The oblique course of the counter knife cutting edge 38 to the connecting line 39 of the two cutting edges 26a is thus due to the fact that the two cutting edges 26a of the thread detection grooves 25, 26 are arranged offset in the direction of movement 40 to each other. In absolute terms, this offset can be, for example, in the range of 1 mm to 2 mm.

Aufgrund des beschriebenen Schrägverlaufs wird bei der Ausführung nach Fig. 7 zunächst der Faden abgeschnitten, der von der Fadenerfassungs-Nut 25 erfasst wird, und anschließend der Faden, der von der Fadenerfassungs-Nut 26 erfasst wird. Eine Scherkraft zwischen den Schneidkanten 26a und 38 wirkt also nicht gleichzeitig zum Abscheren beider Fäden, sondern sequentiell.Due to the described skew is in the execution after Fig. 7 First, the thread is cut, which is detected by the thread detection groove 25, and then the thread, which is detected by the thread detection groove 26. A shear force between the cutting edges 26a and 38 thus does not simultaneously act to shear off both threads, but sequentially.

Bei der Ausführung der Fadenabschneid-Baugruppe nach Fig. 8 verläuft die Gegenmesser-Schneidkante 38 nicht senkrecht zur Bewegungsrichtung 40 des Fadenziehmessers 16, sondern nimmt zu dieser einen kleinsten Winkel α ein, der kleiner ist als 88° und bei der dargestellten Ausführung etwa 78° beträgt. Das Fadenziehmesser 16 ist bei der Ausführung nach Fig. 8 auch hinsichtlich der Anordnung der Schneidkanten 26a genauso ausgeführt wie das Fadenziehmesser 16 nach Fig. 6. Die Schneidkanten 26a sind beim Fadenziehmesser 16 nach Fig. 8 in der Bewegungsrichtung 40 also nicht versetzt zueinander angeordnet.When executing the thread trimming assembly after Fig. 8 the counter-blade cutting edge 38 is not perpendicular to the direction of movement 40 of the thread-pulling knife 16, but takes this to a minimum angle α, which is smaller than 88 ° and in the illustrated embodiment is about 78 °. The thread-pulling knife 16 is in the execution after Fig. 8 also with regard to the arrangement of the cutting edges 26 a executed exactly as the thread-pulling knife 16 after Fig. 6 , The cutting edges 26a are after the thread-pulling knife 16 after Fig. 8 in the direction of movement 40 so not offset from each other.

Aufgrund des Schrägverlaufs der Gegenmesser-Schneidkante 38 ergibt sich beim Fadenabschneiden ein entsprechender sequentieller Scherkraft-Verlauf mit geringerer maximaler Scherkraft, da wiederum zuerst der Faden abgeschnitten wird, der von der Fadenerfassungs-Nut 25 erfasst wird, und anschließend der Faden abgeschnitten wird, der von der Fadenerfassungs-Nut 26 erfasst ist.Due to the oblique course of the counter knife cutting edge 38 results in the thread trimming a corresponding sequential shear force curve with lower maximum shear force, since again first the thread is cut, which is detected by the thread detection groove 25, and then the thread is cut, which is detected by the thread detection groove 26.

Claims (9)

Fadenziehmesser (16) für eine Nähmaschine (1), wobei die Nähmaschine (1) eine Oberfaden-Zuführung und einen um eine Greiferachse (13) drehbaren Greifer (12) umfasst, der einen Greiferkörper aufweist, der ein Vorratsgehäuse (12b) zur Aufnahme eines Greiferfadenvorrats trägt, - wobei das Fadenziehmesser (16) zwischen einer Grundstellung und einer Fadenerfassungsstellung um eine Schwenkachse (18) verschwenkbar ist, - wobei das Fadenziehmesser (16) zwei voneinander getrennt angeordnete Fadenerfassungs-Nuten (25, 26) mit jeweils einer Schneidkante (26a) aufweist, nämlich eine Fadenerfassungs-Nut (26) zur Erfassung eines Oberfadens (11) und eine Fadenerfassungs-Nut (25) zur Erfassung eines Greiferfadens (14), - wobei das Fadenziehmesser (16) für eine Nähmaschine (1) mit horizontal verlaufender Greiferachse (13) ausgestaltet ist. A thread-pulling knife (16) for a sewing machine (1), the sewing machine (1) comprising an upper thread feed and a gripper axis (13) rotatable gripper (12) having a gripper body having a storage housing (12b) for receiving a Looper thread supply, - wherein the thread-pulling knife (16) between a basic position and a thread detection position about a pivot axis (18) is pivotable, - wherein the thread-pulling knife (16) has two separately arranged thread detection grooves (25, 26) each having a cutting edge (26a), namely a thread detection groove (26) for detecting a top thread (11) and a thread detection groove (25 ) for detecting a rapier thread (14), - Wherein the thread-pulling knife (16) for a sewing machine (1) with horizontally extending gripper axis (13) is configured. Fadenziehmesser nach Anspruch 1, dadurch gekennzeichnet, dass die beiden Fadenerfassungs-Nuten (25, 26) beiderseits eines Messer-Grundkörpers (27) des Fadenziehmessers (16) angeordnet sind.Thread-pulling knife according to claim 1, characterized in that the two thread-detecting grooves (25, 26) on both sides of a knife base body (27) of the thread-pulling knife (16) are arranged. Fadenziehmesser nach Anspruch 1 oder 2, gekennzeichnet durch eine Ausgestaltung derart, dass das Fadenziehmesser (16) benachbart zum Greifer (12) verschwenkbar ist.Thread-pulling knife according to claim 1 or 2, characterized by a configuration such that the thread-pulling knife (16) adjacent to the gripper (12) is pivotable. Fadenziehmesser nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Fadenziehmesser (16) bogenförmig ausgebildet ist, so dass es in montierter Grundstellung um den Greifer (12) herum angeordnet ist.Thread-pulling knife according to one of claims 1 to 3, characterized in that the thread-pulling knife (16) is arc-shaped, so that it is arranged in the assembled basic position around the gripper (12) around. Fadenziehmesser nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Schneidkanten (26a) der beiden Fadenerfassungs-Nuten (25, 26) in Bewegungsrichtung (40) des Fadenziehmessers (16) zueinander versetzt angeordnet sind.Thread-pulling knife according to one of claims 1 to 4, characterized in that the cutting edges (26a) of the two thread-detecting grooves (25, 26) are arranged offset from each other in the direction of movement (40) of the thread-pulling knife (16). Fadenabschneid-Baugruppe für eine Nähmaschine (1) mit einem Fadenziehmesser (16) nach einem der Ansprüche 1 bis 5 und mit einem mit dem Fadenziehmesser (16) zusammenwirkenden, rahmenfest angeordneten Gegenmesser (17).Thread trimming assembly for a sewing machine (1) with a thread-pulling knife (16) according to one of claims 1 to 5 and with a with the thread-pulling knife (16) cooperating, frame-fixedly arranged counter knife (17). Fadenabschneid-Baugruppe nach Anspruch 6, dadurch gekennzeichnet, dass eine Schneidkante (38) des Gegenmessers (17) relativ zu einer Verbindungslinie (39) zwischen den beiden Schneidkanten (26a) der Fadenerfassungs-Nuten (25, 26) schräg verläuft.Thread trimming assembly according to claim 6, characterized in that a cutting edge (38) of the counter knife (17) is inclined relative to a connecting line (39) between the two cutting edges (26a) of the thread-detecting grooves (25, 26). Fadenabschneid-Baugruppe nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Schneidkante (38) des Gegenmessers (17) zur Bewegungsrichtung (40) des Fadenziehmessers (16) einen kleinsten Winkel (α) einnimmt, der kleiner ist als 88°.Thread trimming assembly according to claim 6 or 7, characterized in that the cutting edge (38) of the counter knife (17) to the direction of movement (40) of the thread-pulling knife (16) occupies a smallest angle (α), which is smaller than 88 °. Nähmaschine (1) - mit einem Rahmen, - mit einer Oberfaden-Zuführung, - mit einem um eine Greiferachse (13) drehbaren Greifer (12), der einen Greiferkörper aufweist, in dem ein Vorratsgehäuse (12b) zur Aufnahme eines Greiferfadenvorrats aufgenommen ist, gekennzeichnet durch eine Fadenabschneid-Baugruppe nach einem der Ansprüche 6 bis 8. Sewing machine (1) - with a frame, with an upper thread feeder, with a gripper (12) which can rotate about a gripper axis (13) and which has a gripper body in which a storage housing (12b) for receiving a gripper thread supply is accommodated, characterized by a thread trimming assembly according to any one of claims 6 to 8.
EP20130177798 2012-08-01 2013-07-24 Thread pulling blade for a sewing machine, thread cutting module and sewing machine with such a thread pulling blade Active EP2692925B1 (en)

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US4879960A (en) 1988-07-22 1989-11-14 Kansai Special Usa Corp. Thread trimmer system for in-line chain stitch sewing machine
US5333565A (en) * 1992-10-30 1994-08-02 Mim Industries, Inc. Thread cutting via reciprocating arm with pockets and a trimming plate
US5775246A (en) * 1996-12-27 1998-07-07 Kaulin Mfg. Co., Ltd. Under trimming device with inclinedly movable catchers for a multi-needle sewing machine with multiple longitudinally extending loopers
EP1847641B1 (en) 2006-04-21 2010-02-10 Dürkopp Adler Aktiengesellschaft Thread drawing knife for a sewing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3176296A1 (en) * 2015-11-24 2017-06-07 Dürkopp Adler AG Method for creating an initial upper thread of a seam with short seam width and assembly for carrying out the method
EP3360994A1 (en) * 2017-02-08 2018-08-15 Dürkopp Adler AG Double-lock-stitch sewing machine and method for generating an upper seam start thread with a low protrusion
CN112877930A (en) * 2021-01-13 2021-06-01 浙江中星制针股份有限公司 Sewing machine trimming lifts presser foot structure and sewing machine

Also Published As

Publication number Publication date
KR200486535Y1 (en) 2018-05-31
EP2692925B1 (en) 2014-11-12
CN203546369U (en) 2014-04-16
JP3186538U (en) 2013-10-10
DE102012213599A1 (en) 2014-02-06
KR20140000955U (en) 2014-02-11
TWM481936U (en) 2014-07-11

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