EP1577431B1 - Chain stitch sewing machine - Google Patents

Chain stitch sewing machine Download PDF

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Publication number
EP1577431B1
EP1577431B1 EP05001358A EP05001358A EP1577431B1 EP 1577431 B1 EP1577431 B1 EP 1577431B1 EP 05001358 A EP05001358 A EP 05001358A EP 05001358 A EP05001358 A EP 05001358A EP 1577431 B1 EP1577431 B1 EP 1577431B1
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EP
European Patent Office
Prior art keywords
thread
catcher
needle
thread catcher
sewn material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05001358A
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German (de)
French (fr)
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EP1577431A1 (en
Inventor
Frank Rattay
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KSA GmbH and Co KG
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KSA GmbH and Co KG
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Publication date
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Publication of EP1577431A1 publication Critical patent/EP1577431A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/02—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making single-thread seams
    • D05B1/06—Single chain-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B61/00—Loop holders; Loop spreaders; Stitch-forming fingers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/006—Hooked needles

Definitions

  • the invention relates to a chain stitch sewing apparatus having a sewing head movable parallel to a sewing material plane, comprising a needle bar for a thread-guiding needle, a needle drive for rectilinear reciprocating movement of the needle bar transversely to the sewing material plane, a needle-shaped thread catcher provided with an open catch hook and a catcher drive for rectilinear approach - And move the thread catcher transversely to the Nähgutebene, the trajectories of the needle and the thread catcher form an acute angle with each other, the vertex is below the Nähgutebene and wherein the needle drive and the catcher drive are controlled so that when retracting the needle from the fabric below the same formed thread loop detected by the thread catcher and pulled up through the fabric.
  • Such a sewing device is for example from the DE 197 51 011 A1 known.
  • the thread catcher is driven during its up and down movement to rotate about its direction of rotation.
  • the thread catcher assumes a rotational position in which the hook opening points at least approximately in the feed direction of the sewing head, so that the thread loop when advancing the sewing head does not slip from the catcher and the new loop can be pulled through the previous loop to allow a secure chaining of the loops.
  • the invention has for its object to provide a sewing device of the type mentioned, which is not only reliable, but also simple in construction.
  • the thread catcher is associated with a drivable thread puller, which has a transverse to the trajectory of the thread catcher in the path of the thread catcher hanging thread loop movable arm and its drive is controlled so that the arm near the upper position of Yarn catcher deflects the thread loop hanging on the thread catcher transversely to the path of movement of the thread catcher after the side opposite the hook opening.
  • the thread catcher is only moved up and down, but otherwise retains a position at which the hook opening points against the sewing direction. This avoids the risk that the thread catcher again detects the thread loop already deposited on the sewing surface when pulling up the new thread loop.
  • the new thread loop hanging on the hook of the thread catcher in its upper position is stretched into the hook by the thread-pulling device, see above that it can not slide off the thread catcher when it reverses its direction of movement to stab back into the fabric. This ensures that the thread catcher punctures in its downward movement through the loop into the fabric and pulls the new loop on its return through the deposited on the top of the fabric loop.
  • the device according to the invention is easy to implement and ensures safe chain formation.
  • the arm of the thread puller may for example be formed by a wire-shaped bracket, which extends substantially parallel to the material plane and is mounted such that its free end upon actuation of its drive along a - viewed in a vertical projection on the fabric plane - annular closed path emotional. By this trajectory it is avoided that the thread catcher and the thread puller interfere with each other.
  • the trajectory of the yarn catcher is expediently directed substantially perpendicular to the material plane, wherein the trajectories of the needle and the yarn catcher lie in a direction transverse to the feed direction of the sewing head and perpendicular to the Nähgutebene plane.
  • the angle between the trajectories of the thread catcher and the needle is preferably in the range of 30 ° to 60 °.
  • the sewing head as a whole has a relatively large mass, it is expedient if it can be moved continuously in order to avoid constant deceleration and acceleration of the sewing head.
  • at least the needle and the thread catcher, possibly also the thread puller are expediently arranged together with their respective drive on a frame which can be moved back and forth parallel to the sewing direction in the sewing head housing, so that the sewing head as a whole can also be moved in sewing direction when the needle and / or the thread catcher are still in the fabric.
  • the frame follows the sewing head movement within the sewing head housing until the needle again pierces the fabric.
  • Fig.1 is denoted by 10 a schematically illustrated sewing head, which can hang in a conventional manner on a robot arm, not shown, and with the aid of which in the direction of arrow A can be transported parallel to a Nähgutauflage representation 12 via a workpiece lying thereon 14.
  • a Nähgutniederhalter 18 is arranged on the housing 16 of the sewing head 10 .
  • a needle bar 20 which carries a needle 22 and about a disposed within the housing 16, not completely shown drive 24 in the direction of the arrow B back and forth.
  • the needle 22 is intended to pierce the fabric 14 while pulling a thread through the fabric 14.
  • a needle-shaped thread catcher 26 is arranged on the sewing head, which is held by a catcher rod 28 and by means of a catcher drive 29 within the Nähkopfgeophuses 16 in the direction of arrow C is substantially perpendicular to the fabric support 12 up and down movable.
  • the thread catcher 26 is aligned so that the opening 34 of the hook 30 opposite to the feed direction A of the sewing head 10 has. As well as the thread catcher 26 has been pulled out of the fabric 14, move the sewing head 10 or the seam-forming members 22 and 26 in the direction of arrow A, before by piercing the needle 22 into the fabric 14, a new cycle begins.
  • the needle bar 20 and the catcher rod 28 are guided in a frame, which because of the clarity of the illustration in the Fig.1 is not shown and which is arranged in a conventional manner within the housing 16 so that it is parallel to the sewing direction A relative to the housing 16 back and forth.
  • the housing 16 of the sewing head 10 can be moved continuously, while the needle 22 and the thread catcher 26 are only advanced when they are outside the material 14.
  • a thread pulling device generally designated 36, is provided.
  • This comprises a substantially vertical rod 38, at its lower end a directed substantially parallel to the fabric support 12 arm 40 is fixed with a U-shaped hook-shaped end 42.
  • the rod 38 is fixed to the one end of a horizontal lever 44 which is slidably mounted by means of a slot 46 on a sliding block 48 in the direction of arrow D and about the axis 50 of a bolt 52 pivotally.
  • the sliding block 48 is fastened with the bolt 52 to a housing-fixed support, not shown.
  • the other end of the lever 44 is connected to an eccentric 54 which is mounted in a housing-fixed bearing part 56 and driven by bevel gears 58.
  • Fig.2 shows a position of the thread catcher 26 and the arm 38 of the thread puller according to the Fig.1 , ie shortly before or when the thread catcher 26 has reached its top dead center and the loop 32 has pulled out of the fabric 14.
  • the arm 40 is pivoted in the direction of the loop 32, wherein it deflects approximately in the feed direction of the sewing head 10, so that the loop 32 is pulled into the hook 30, as shown in Figure 3 can be seen. It can be seen that during a downward movement of the thread catcher 26 from the in Figure 3 shown position of the thread catcher 26 passes through the loop 32, which slides out of the hook 30 on the yarn catcher 26 upwards.
  • the arm 40 of the thread pulling device 36 is retracted ( Figure 4 ). This ensures that the thread catcher 26 passes through the loop 32 during insertion into the sewing material 14 and also pulls the new loop through the then lying on the fabric surface loop 32 'in its upward movement, so as to form a chain seam.
  • the thread-pulling device 36 can be realized by simple means and ensures reliable operation of the sewing device.

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

Description

Die Erfindung betrifft eine Kettenstichnähvorrichtung mit einem parallel zu einer Nähgutebene bewegbaren Nähkopf, umfassend eine Nadelstange für eine fadenführende Nadel, einen Nadelantrieb zum geradlinigen Hin- und Herbewegen der Nadelstange quer zur Nähgutebene, einen mit einem offenen Fanghaken versehenen nadelförmigen Fadenfänger und einen Fängerantrieb zum geradlinigen hin- und herbewegen des Fadenfängers quer zur Nähgutebene, wobei die Bewegungsbahnen der Nadel und des Fadenfängers einen spitzen Winkel miteinander bilden, dessen Scheitel unterhalb der Nähgutebene liegt und wobei der Nadelantrieb und der Fängerantrieb so gesteuert sind, daß eine beim Zurückziehen der Nadel aus dem Nähgut unterhalb desselben gebildete Fadenschlaufe von dem Fadenfänger erfaßt und durch das Nähgut nach oben gezogen wird.The invention relates to a chain stitch sewing apparatus having a sewing head movable parallel to a sewing material plane, comprising a needle bar for a thread-guiding needle, a needle drive for rectilinear reciprocating movement of the needle bar transversely to the sewing material plane, a needle-shaped thread catcher provided with an open catch hook and a catcher drive for rectilinear approach - And move the thread catcher transversely to the Nähgutebene, the trajectories of the needle and the thread catcher form an acute angle with each other, the vertex is below the Nähgutebene and wherein the needle drive and the catcher drive are controlled so that when retracting the needle from the fabric below the same formed thread loop detected by the thread catcher and pulled up through the fabric.

Eine solche Nähvorrichtung ist beispielsweise aus der DE 197 51 011 A1 bekannt. Bei der dort beschriebenen Lösung wird der Fadenfänger während seiner Auf- und Abbewegung auch um seine Bewegungsrichtung rotatorisch schwingend angetrieben. Beim Einstechen des Fadenfängers in das Nähgut nimmt der Fadenfänger eine Drehstellung ein, in der die Hakenöffnung zumindest annähernd in Vorschubrichtung des Nähkopfes zeigt, damit die Fadenschlaufe beim Vorrücken des Nähkopfes nicht von dem Fänger rutscht und die neue Schlaufe durch die vorhergehende Schlaufe gezogen werden kann, um eine sichere Verkettung der Schlaufen zu ermöglichen. Vor der Aufwärtsbewegung des Fadenfängers mit der neu erfaßten Schlaufe aber wird der Fadenfänger in eine Drehstellung geschwenkt, in welcher die Hakenöffnung zumindest annähernd entgegen der Transportrichtung des Nähkopfes weist, um zu verhindern, daß die auf der Nähgutoberfläche liegende Schlaufe bei der Aufwärtsbewegung des Fadenfängers erneut von dem Haken erfaßt wird. Um den Fadenfänger neben der Auf- und Abbewegung aber auch um seine Bewegungsbahn hin und her zu drehen, ist eine komplizierte Mechanik erforderlich.Such a sewing device is for example from the DE 197 51 011 A1 known. In the solution described there, the thread catcher is driven during its up and down movement to rotate about its direction of rotation. When the thread catcher is inserted into the sewing material, the thread catcher assumes a rotational position in which the hook opening points at least approximately in the feed direction of the sewing head, so that the thread loop when advancing the sewing head does not slip from the catcher and the new loop can be pulled through the previous loop to allow a secure chaining of the loops. Before the upward movement of the thread catcher with the newly detected loop but the thread catcher is pivoted into a rotational position in which the hook opening at least approximately opposite to the transport direction of the sewing head, to prevent the lying on the fabric surface loop in the upward movement of the thread catcher again the hook is detected. To turn the thread catcher in addition to the up and down movement but also about its trajectory back and forth, a complicated mechanism is required.

Der Erfindung liegt die Aufgabe zugrunde, eine Nähvorrichtung der eingangs genannten Art anzugeben, die nicht nur funktionssicher, sondern auch einfach im Aufbau ist.The invention has for its object to provide a sewing device of the type mentioned, which is not only reliable, but also simple in construction.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß dem Fadenfänger ein antreibbarer Fadenzieher zugeordnet ist, der einen quer zur Bewegungsbahn des Fadenfängers in den Weg der an dem Fadenfänger hängenden Fadenschlaufe bewegbaren Arm hat und dessen Antrieb so gesteuert ist, daß der Arm nahe der oberen Stellung des Fadenfängers die an dem Fadenfänger hängende Fadenschlaufe quer zur Bewegungsbahn des Fadenfängers nach der der Hakenöffnung entgegengesetzten Seite auslenkt.This object is achieved in that the thread catcher is associated with a drivable thread puller, which has a transverse to the trajectory of the thread catcher in the path of the thread catcher hanging thread loop movable arm and its drive is controlled so that the arm near the upper position of Yarn catcher deflects the thread loop hanging on the thread catcher transversely to the path of movement of the thread catcher after the side opposite the hook opening.

Bei der erfindungsgemäßen Nähvorrichtung wird der Fadenfänger nur auf- und abbewegt, behält im übrigen aber eine Stellung bei, bei welcher die Hakenöffnung entgegen der Nährichtung zeigt. Damit wird die Gefahr vermieden, daß der Fadenfänger die auf der Nähoberfläche bereits abgelegte Fadenschlaufe beim Hochziehen der neuen Fadenschlaufe wieder mit erfaßt. Andererseits wird durch den Fadenzieher die am Haken des in seiner oberen Stellung befindlichen Fadenfängers hängende neue Fadenschlaufe in den Haken gespannt, so daß sie nicht von dem Fadenfänger abgleiten kann, wenn dieser seine Bewegungsrichtung umkehrt, um wieder in das Nähgut einzustechen. Dadurch ist sichergestellt, daß der Fadenfänger bei seiner Abwärtsbewegung durch die Schlaufe hindurch in das Nähgut einsticht und die neue Schlaufe bei seiner Rückkehr durch die auf der Oberseite des Nähgutes abgelegte Schlaufe zieht. Die erfindungsgemäße Vorrichtung ist einfach zu realisieren und gewährleistet eine sichere Kettenbildung.In the sewing device according to the invention, the thread catcher is only moved up and down, but otherwise retains a position at which the hook opening points against the sewing direction. This avoids the risk that the thread catcher again detects the thread loop already deposited on the sewing surface when pulling up the new thread loop. On the other hand, the new thread loop hanging on the hook of the thread catcher in its upper position is stretched into the hook by the thread-pulling device, see above that it can not slide off the thread catcher when it reverses its direction of movement to stab back into the fabric. This ensures that the thread catcher punctures in its downward movement through the loop into the fabric and pulls the new loop on its return through the deposited on the top of the fabric loop. The device according to the invention is easy to implement and ensures safe chain formation.

Der Arm des Fadenziehers kann beispielsweise von einem drahtförmigen Bügel gebildet sein, der sich im wesentlichen parallel zur Nähgutebene erstreckt und derart gelagert ist, dass sein freies Ende bei Betätigung seines Antriebes sich entlang einer - in einer senkrechten Projektion auf die Nähgutebene betrachtet - ringförmig geschlossenen Bahn bewegt. Durch diese Bewegungsbahn wird vermieden, dass sich der Fadenfänger und der Fadenzieher gegenseitig behindern.The arm of the thread puller may for example be formed by a wire-shaped bracket, which extends substantially parallel to the material plane and is mounted such that its free end upon actuation of its drive along a - viewed in a vertical projection on the fabric plane - annular closed path emotional. By this trajectory it is avoided that the thread catcher and the thread puller interfere with each other.

Um eine sichere Stichbildung zu gewährleisten, ist die Bewegungsbahn des Fadenfängers zweckmäßigerweise im wesentlichen senkrecht zur Nähgutebene gerichtet, wobei die Bewegungsbahnen der Nadel und des Fadenfängers in einer quer zur Vorschubrichtung des Nähkopfes und senkrecht zur Nähgutebene gerichteten Ebene liegen. Der Winkel zwischen den Bewegungsbahnen des Fadenfängers und der Nadel liegt vorzugsweise im Bereich von 30° bis 60°.In order to ensure a secure stitch formation, the trajectory of the yarn catcher is expediently directed substantially perpendicular to the material plane, wherein the trajectories of the needle and the yarn catcher lie in a direction transverse to the feed direction of the sewing head and perpendicular to the Nähgutebene plane. The angle between the trajectories of the thread catcher and the needle is preferably in the range of 30 ° to 60 °.

Da der Nähkopf insgesamt eine relativ große Masse hat, ist es zweckmäßig, wenn er kontinuierlich bewegt werden kann, um ein ständiges Abbremsen und Beschleunigen des Nähkopfes zu vermeiden. Um eine solche kontinuierliche Bewegung zu ermöglichen, sind mindestens die Nadel und der Fadenfänger, gegebenenfalls auch der Fadenzieher zusammen mit ihrem jeweiligen Antrieb zweckmäßigerweise an einem in dem Nähkopfgehäuse parallel zur Nährichtung hin- und herverstellbaren Rahmen angeordnet, so daß der Nähkopf als Ganzes auch dann in Nährichtung bewegt werden kann, wenn sich die Nadel und/oder der Fadenfänger noch im Nähgut befinden. Sowie der Fadenfänger und die Nadel gleichzeitig aus dem Nähgut herausgezogen sind, folgt der Rahmen der Nähkopfbewegung innerhalb des Nähkopfgehäuses, bis die Nadel wieder in das Nähgut einsticht.Since the sewing head as a whole has a relatively large mass, it is expedient if it can be moved continuously in order to avoid constant deceleration and acceleration of the sewing head. In order to enable such a continuous movement, at least the needle and the thread catcher, possibly also the thread puller are expediently arranged together with their respective drive on a frame which can be moved back and forth parallel to the sewing direction in the sewing head housing, so that the sewing head as a whole can also be moved in sewing direction when the needle and / or the thread catcher are still in the fabric. As the thread catcher and the needle are simultaneously pulled out of the fabric, the frame follows the sewing head movement within the sewing head housing until the needle again pierces the fabric.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus-der folgenden Beschreibung, welche in Verbindung mit den beigefügten Zeichnungen die Erfindung anhand eines Ausführungsbeispieles erläutert. Es zeigen:

Fig.1
eine schematische perspektivische Teilansicht einer erfindungsgemäßen Nähvorrichtung und
Fig.2 bis 4
schematische Darstellungen des Fadenfängers und des ihm zugeordneten Fadenziehers zur Erläuterung der Funktion des letzteren.
Further features and advantages of the invention will become apparent from the following description, which explains the invention with reference to an embodiment in conjunction with the accompanying drawings. Show it:
Fig.1
a schematic perspective partial view of a sewing device according to the invention and
2 to 4
schematic representations of the thread catcher and its associated thread puller to explain the function of the latter.

In der Fig.1 ist mit 10 ein schematisch dargestellter Nähkopf bezeichnet, der in an sich bekannter Weise an einem nicht dargestellten Roboterarm hängen kann und mit dessen Hilfe in Richtung des Pfeiles A parallel zu einer Nähgutauflagefläche 12 über ein darauf liegendes Nähgutteil 14 transportiert werden kann. An dem Gehäuse 16 des Nähkopfes 10 ist ein Nähgutniederhalter 18 angeordnet. Ferner erkennt man eine Nadelstange 20, die eine Nadel 22 trägt und über einen innerhalb des Gehäuses 16 angeordneten, nicht vollständig dargestellten Antrieb 24 in Richtung des Pfeiles B hin- und herbewegbar ist. Die Nadel 22 ist dazu bestimmt, das Nähgut 14 zu durchstechen und dabei einen Faden durch das Nähgut 14 zu ziehen.In the Fig.1 is denoted by 10 a schematically illustrated sewing head, which can hang in a conventional manner on a robot arm, not shown, and with the aid of which in the direction of arrow A can be transported parallel to a Nähgutauflagefläche 12 via a workpiece lying thereon 14. On the housing 16 of the sewing head 10 a Nähgutniederhalter 18 is arranged. Further, one recognizes a needle bar 20, which carries a needle 22 and about a disposed within the housing 16, not completely shown drive 24 in the direction of the arrow B back and forth. The needle 22 is intended to pierce the fabric 14 while pulling a thread through the fabric 14.

Ferner ist an dem Nähkopf ein nadelförmiger Fadenfänger 26 angeordnet, der von einer Fängerstange 28 gehalten wird und mittels eines Fängerantriebes 29 innerhalb, des Nähkopfgehäuses 16 in Richtung des Pfeiles C im wesentlichen senkrecht zur Nähgutauflage 12 auf und ab bewegbar ist.Further, a needle-shaped thread catcher 26 is arranged on the sewing head, which is held by a catcher rod 28 and by means of a catcher drive 29 within the Nähkopfgehäuses 16 in the direction of arrow C is substantially perpendicular to the fabric support 12 up and down movable.

Wie man in Fig.1 erkennt, bilden die Bewegungsrichtungen B und C der Nadel 22 und des Fadenfängers 26 einen Winkel α miteinander, der vorzugsweise zwischen 30° und 60° beträgt und dessen Scheitelpunkt S unterhalb der Unterseite des Nähgutes 14 liegt. Wenn die Nadel 22 durch das Nähgut 14 hindurchgestochen hat, bildet sie beim Zurückziehen eine Fadenschlaufe. Durch diese Fadenschlaufe sticht anschließend der nadelförmige Fadenfänger 26 und erfaßt bei seiner Aufwärtsbewegung die Fadenschlaufe mit einem an seinem unteren Ende ausgebildeten Haken 30. Bei seiner Aufwärtsbewegung zieht er diese Schlaufe 32 durch das Nähgut 14 nach oben aus dem Nähgut 14 heraus und durch die unmittelbar vorher gebildete, auf der Oberfläche des Nähguts 14 abgelegte Schlaufe 32', wie man dies in den Fig.2 bis 4 erkennt. Der Fadenfänger 26 ist dabei so ausgerichtet, daß die Öffnung 34 des Hakens 30 entgegen der Vorschubrichtung A des Nähkopfes 10 weist. Sowie auch der Fadenfänger 26 aus dem Nähgut 14 herausgezogen wurde, rücken der Nähkopf 10 oder die nahtbildenden Organe 22 und 26 in Richtung des Pfeiles A vor, bevor durch das Einstechen der Nadel 22 in das Nähgut 14 ein neuer Zyklus beginnt.How to get in Fig.1 recognizes the directions of movement B and C of the needle 22 and the yarn catcher 26 an angle α with each other, which is preferably between 30 ° and 60 ° and the vertex S is below the bottom of the fabric 14. When the needle 22 has pierced through the fabric 14, it forms a thread loop during retraction. Through this thread loop then sticks the needle-shaped thread catcher 26 and detected in its upward movement, the thread loop with a hook formed at its lower end 30. In its upward movement, he pulls this loop 32 through the fabric 14 up out of the fabric 14 and through the immediately before formed, deposited on the surface of the fabric 14 loop 32 ', as can be seen in the 2 to 4 recognizes. The thread catcher 26 is aligned so that the opening 34 of the hook 30 opposite to the feed direction A of the sewing head 10 has. As well as the thread catcher 26 has been pulled out of the fabric 14, move the sewing head 10 or the seam-forming members 22 and 26 in the direction of arrow A, before by piercing the needle 22 into the fabric 14, a new cycle begins.

Die Nadelstange 20 und die Fängerstange 28 sind in einem Rahmen geführt, der wegen der besseren Übersichtlichkeit der Darstellung in der Fig.1 nicht eingezeichnet ist und der in an sich bekannter Weise innerhalb des Gehäuses 16 so angeordnet ist, dass er parallel zur Nährichtung A relativ zum Gehäuse 16 hin- und herbewegbar ist. Dadurch kann das Gehäuse 16 des Nähkopfes 10 kontinuierlich bewegt werden, während die Nadel 22 und der Fadenfänger 26 nur dann vorgeschoben werden, wenn sie sich außerhalb des Nähgutes 14 befinden.The needle bar 20 and the catcher rod 28 are guided in a frame, which because of the clarity of the illustration in the Fig.1 is not shown and which is arranged in a conventional manner within the housing 16 so that it is parallel to the sewing direction A relative to the housing 16 back and forth. As a result, the housing 16 of the sewing head 10 can be moved continuously, while the needle 22 and the thread catcher 26 are only advanced when they are outside the material 14.

Wie man bei der Beschreibung der Nahtbildung erkennt, bestünde dabei die Gefahr, daß beim Vorschub des Nähkopfes 10 bzw. der nahtbildenden Organe die Schlaufe 32 aus dem Haken herausrutscht bzw. so gespannt wird, daß der Fadenfänger 26 beim Einstechen in das Nähgut 14 nicht mehr durch die Schlaufe 32 tritt. Dies ist aber notwendig, damit eine Verkettung der Schlaufen erfolgt.As can be seen in the description of the seam formation, there would be the danger that when feeding the sewing head 10 and the seam-forming organs, the loop 32 slips out of the hook or is so tense that the thread catcher 26 when piercing the fabric 14 is no longer through the loop 32 occurs. But this is necessary so that a chaining of loops takes place.

Um sicherzustellen, daß der Fadenfänger 26 beim Einstechen in das Nähgut 14 auch durch die Schlaufe 32 tritt, ist ein allgemein mit 36 bezeichneter Fadenzieher vorgesehen. Dieser umfasst eine im wesentlichen vertikale Stange 38, an deren unterem Ende ein im wesentlichen parallel zur Nähgutauflage 12 gerichteter Arm 40 mit einem U-förmig gebogenen hakenförmigen Ende 42 befestigt ist. Die Stange 38 ist an dem einen Ende eines horizontalen Hebels 44 befestigt, der mittels eines Langloches 46 an einem Gleitstein 48 in Richtung des Pfeiles D verschiebbar und um die Achse 50 eines Bolzen 52 schwenkbar gelagert ist. Der Gleitstein 48 ist mit dem Bolzen 52 an einem nicht dargestellten gehäusefesten Träger befestigt. Das andere Ende des Hebels 44 ist mit einem Exzenter 54 verbunden, der in einem gehäusefesten Lagerteil 56 gelagert und über Kegelzahnräder 58 antreibbar ist.In order to ensure that the thread catcher 26 also passes through the loop 32 when it is pierced into the sewing material 14, a thread pulling device, generally designated 36, is provided. This comprises a substantially vertical rod 38, at its lower end a directed substantially parallel to the fabric support 12 arm 40 is fixed with a U-shaped hook-shaped end 42. The rod 38 is fixed to the one end of a horizontal lever 44 which is slidably mounted by means of a slot 46 on a sliding block 48 in the direction of arrow D and about the axis 50 of a bolt 52 pivotally. The sliding block 48 is fastened with the bolt 52 to a housing-fixed support, not shown. The other end of the lever 44 is connected to an eccentric 54 which is mounted in a housing-fixed bearing part 56 and driven by bevel gears 58.

Durch den Antrieb des Hebels 44 über den Exzenter 54 führt das hakenförmige Ende 42 des Armes 40 eine Bewegung entlang einer ringförmig geschlossenen, annähernd elliptischen Bahnkurve aus. Die Wirkungsweise des Fadenziehers 36 soll nun anhand der Fig.2 bis 4 näher erläutert werden.By driving the lever 44 via the eccentric 54, the hook-shaped end 42 of the arm 40 performs a movement along an annularly closed, approximately elliptical trajectory. The mode of action of the thread puller 36 will now be based on the 2 to 4 be explained in more detail.

Fig.2 zeigt eine Stellung des Fadenfängers 26 und des Armes 38 des Fadenziehers entsprechend der Fig.1, d.h. kurz bevor oder wenn der Fadenfänger 26 seinen oberen Totpunkt erreicht hat und die Schlaufe 32 aus dem Nähgut 14 herausgezogen hat. Bevor nun der Fadenfänger 26 wieder in Richtung auf das Nähgut 14 bewegt wird, wird der Arm 40 in Richtung auf die Schlaufe 32 verschwenkt, wobei er diese annähernd in Vorschubrichtung des Nähkopfes 10 auslenkt, so daß die Schlaufe 32 in den Haken 30 hineingezogen wird, wie dies in Fig.3 zu erkennen ist. Man erkennt, daß bei einer Abwärtsbewegung des Fadenfängers 26 aus der in Fig.3 dargestellten Stellung der Fadenfänger 26 durch die Schlaufe 32 hindurchtritt, wobei diese an dem Fadenfänger 26 nach oben aus dem Haken 30 herausgleitet. Kurz bevor der Fadenfänger in das Nähgut 14 einsticht, wird der Arm 40 des Fadenziehers 36 zurückgezogen (Fig.4). Damit ist sichergestellt, daß der Fadenfänger 26 beim Einstechen in das Nähgut 14 durch die Schlaufe 32 hindurchtritt und auch bei seiner Aufwärtsbewegung die neue Schlaufe durch die dann auf der Nähgutoberfläche liegende Schlaufe 32' hindurchzieht, um so eine Kettennaht zu bilden. Der Fadenzieher 36 ist mit einfachen Mitteln zu realisieren und gewährleistet eine zuverlässige Funktion der Nähvorrichtung. Fig.2 shows a position of the thread catcher 26 and the arm 38 of the thread puller according to the Fig.1 , ie shortly before or when the thread catcher 26 has reached its top dead center and the loop 32 has pulled out of the fabric 14. Before now the thread catcher 26 again in the direction of the Sewing material 14 is moved, the arm 40 is pivoted in the direction of the loop 32, wherein it deflects approximately in the feed direction of the sewing head 10, so that the loop 32 is pulled into the hook 30, as shown in Figure 3 can be seen. It can be seen that during a downward movement of the thread catcher 26 from the in Figure 3 shown position of the thread catcher 26 passes through the loop 32, which slides out of the hook 30 on the yarn catcher 26 upwards. Shortly before the thread catcher punctures the sewing material 14, the arm 40 of the thread pulling device 36 is retracted ( Figure 4 ). This ensures that the thread catcher 26 passes through the loop 32 during insertion into the sewing material 14 and also pulls the new loop through the then lying on the fabric surface loop 32 'in its upward movement, so as to form a chain seam. The thread-pulling device 36 can be realized by simple means and ensures reliable operation of the sewing device.

Claims (5)

  1. A chain stitch sewing mechanism with a sewing head (10) movable parallel to a sewn material plane (12), which sewing head includes a needle rod (20) for a thread carrying needle (22), a needle drive (24) for linearly moving the needle rod (20) back and forth transversely to the sewn material plane (12), a needle-shaped thread catcher (26) provided with an open catching hook (30) and a catcher drive (29) for linearly moving the thread catcher (26) back and forth transversely to the sewn material plane (12), with the movement paths of the needle (22) and of the thread catcher (26) forming a sharp angle α with one another whose apex S lies below the sewn material plane (12) and with the needle drive and the catcher drive being so controlled that a thread loop (32) formed by the withdrawal of the needle (22) out of the sewn material (14) and located below the sewn material (14) is caught by the thread catcher (26) and pulled by the thread catcher upwardly through the sewn material (14), characterized in that a driven thread puller (36) is associated with the thread catcher (26), which thread puller has an arm (40) movable transversely to the movement path of the thread catcher (26) into the path of the thread loop (32) hanging on the thread catcher (26) and whose drive is so controlled that the arm (40) near the uppermost position of the thread catcher (26) deflects the thread loop (32) hanging from the thread catcher (26) transversely to the movement path of the thread catcher (26) and toward the side opposite to that of the hook opening (34).
  2. A chain stitch sewing mechanism according to claim 1, characterized in that the arm (40) of the thread puller (36) is made from a wire-shaped bow, which bow extends essentially parallel to the sewn material plane (12) and is so supported that its free end (42) upon actuation of its drive moves along - as seen in a perpendicular projection onto the sewn material plane (12) - an annular closed path.
  3. A chain stitch sewing mechanism according to claim 1 or 2, characterized in that the movement path of the thread catcher (26) is oriented essentially perpendicularly to the sewn material plane (12) and that the movement paths of the needle (22) and of the thread catcher (26) lie in a plane transversely to the advancement direction A of the sewing head (10) and perpendicular to the sewn material plane (12).
  4. A chain stitch sewing mechanism according to one of claims 1 to 3, characterized in that the angle α between the movement paths of the thread catcher (26) and of the needle (22) has a value of about 30° to 60°.
  5. A chain stitch sewing mechanism according to one of the claims 1 to 4, characterized in that at least the needle (22) and the thread catcher (26) together with their individual drives are arranged on a frame located in the sewing head housing (16) and movable back and forth parallel to the advancement direction A of the sewing head (10).
EP05001358A 2004-03-16 2005-01-24 Chain stitch sewing machine Expired - Fee Related EP1577431B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004012822A DE102004012822B3 (en) 2004-03-16 2004-03-16 Sewing machine needle chain stitch mechanism has thread trap operating in conjunction with powered thread puller
DE102004012822 2004-03-16

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EP1577431A1 EP1577431A1 (en) 2005-09-21
EP1577431B1 true EP1577431B1 (en) 2008-03-12

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US (1) US6973887B2 (en)
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DE (2) DE102004012822B3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7353761B2 (en) * 2003-05-05 2008-04-08 Georg Janouschek Sewing machine
JP5095314B2 (en) * 2007-09-03 2012-12-12 Ｊｕｋｉ株式会社 sewing machine
JP2009066127A (en) * 2007-09-12 2009-04-02 Juki Corp Threading device of sewing machine
JP2022175479A (en) * 2021-05-13 2022-11-25 株式会社ジャノメ Top stitching mechanism and sewing machine

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Publication number Priority date Publication date Assignee Title
US1590686A (en) * 1918-11-14 1926-06-29 Holtermand Jens Method of sewing two articles together
US1714928A (en) * 1926-06-23 1929-05-28 Victor J Sigoda Stitch-forming mechanism for sewing machines
US2369183A (en) * 1939-10-05 1945-02-13 Mansew Pinking Attachment Corp Multiple needle stitching mechanism
US2533292A (en) * 1947-10-22 1950-12-12 Man Sew Corp Multiple needle stitching mechanism
US2687103A (en) * 1952-11-18 1954-08-24 Mosberg Abraham Blindstitch attachment for sewing machines
DE3515189C1 (en) * 1985-04-26 1986-11-06 J. Strobel & Söhne - GmbH & Co, 8000 München Chainstitch blindstitch sewing machine for sewing the sewing material point by point
GB9406537D0 (en) * 1994-03-31 1994-05-25 British Aerospace Blind stitching apparatus and composite material manufacturing methods
JP3688076B2 (en) * 1996-09-12 2005-08-24 ジューキ株式会社 sewing machine
DE19751011C2 (en) * 1997-11-18 2000-12-07 Altin Naehtechnik Gmbh sewing machine
DE19813887A1 (en) * 1998-03-28 1999-09-30 Freundes Und Foerderkreis Des Method and device for producing sewing seams

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EP1577431A1 (en) 2005-09-21
US20050204976A1 (en) 2005-09-22
DE102004012822B3 (en) 2005-06-16
US6973887B2 (en) 2005-12-13
DE502005003159D1 (en) 2008-04-24

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