EP2653599B1 - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
EP2653599B1
EP2653599B1 EP13161010.7A EP13161010A EP2653599B1 EP 2653599 B1 EP2653599 B1 EP 2653599B1 EP 13161010 A EP13161010 A EP 13161010A EP 2653599 B1 EP2653599 B1 EP 2653599B1
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EP
European Patent Office
Prior art keywords
drive
shaft
transmission
sewing machine
gripper
Prior art date
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Application number
EP13161010.7A
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German (de)
French (fr)
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EP2653599A1 (en
Inventor
Jakob Harder
Borivoj Huvar
Milan Mazourek
Milos Abraham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerkopp Adler AG
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Duerkopp Adler AG
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Publication of EP2653599A1 publication Critical patent/EP2653599A1/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/30—Details
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/30—Driving-gear for loop takers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/28—Applications of bobbins for storing the lower thread

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • the US 6 032 597 A shows a sewing machine with a needle bar, a gripper and a gripper drive.
  • a gripper swing shaft is perpendicular to a drive shaft.
  • the shows DE 25 53 363 A1 a sewing machine with a device for generating a pivoting or oscillating movement on an output shaft via a drive shaft.
  • the gripper drives of known sewing machines are subject to high wear, in particular when the sewing machines are used for sewing very resistant sewing material. In addition, the gripper drives are loud.
  • such a gripper drive which is also known as oscillating or pendulum gripper drive
  • a drive unit with a directly mounted on the drive shaft eccentric is very robust. By such a design of the drive unit further components can be saved and the design effort of the sewing machine can be reduced.
  • a drive unit according to claim 2 is structurally simple and securely transmits the pivoting movement of the transmission wheel in a swinging movement of the gripper rocker shaft.
  • a drive unit derives the drive movement of the gripper from the arm shaft rotation.
  • the drive shaft of the gripper drive can also be a shaft driven independently of the arm shaft.
  • a triangular cam unit according to claim 4 can lead to a reduction of mechanical stress on the connecting rod.
  • a toothed belt according to claim 5 is robust.
  • the toothed belt may have a basic elasticity which reduces a momentum transfer in the region of the reversal points of the drive oscillation movement and thus contributes on the one hand to wear and, on the other hand, to noise reduction.
  • a transmission ratio according to claim 6 has proven itself in practice.
  • An angular amplitude of the transmission oscillation movement is converted into an angle amplitude of the drive oscillation movement which is increased by the transmission ratio.
  • the gear ratio can range from 2: 1 to 4: 1.
  • the angular amplitude of the drive oscillation movement can be greater than 180 °.
  • the angle amplitude of the drive oscillation movement is greater than 200 °, greater than 220 °, greater than 250 ° and is preferably in the range of 270 °.
  • An angular amplitude of the drive swinging motion greater than 180 ° can ensure that an upper thread is guided around a gripper housing of the sewing machine for knotting.
  • a sewing machine 1 has an upper arm 2, a vertical stand 3 and a lower housing, which is commonly referred to as a base plate 4.
  • the sewing machine 1 is designed for sewing heavy or durable material, eg. As leather or plastic plates.
  • the components 2 to 4 are in the Fig. 1 only as far as their contours are concerned.
  • an arm shaft 5 is rotatable on a schematically in the Fig. 1 indicated frame 5a stored.
  • One of these arm shaft bearings is in the area of a stand-side arm shaft end and another of the arm shaft bearings arranged in the region of an opposite Armwellenendes in a head 6 of the sewing machine 1.
  • About the arm shaft 5 and a crank mechanism 8 is a vertically mounted in the head 6 needle bar 9 vertically up and down driven, which carries a needle 10 at its lower end.
  • a barell gripper 11 is driven back and forth in the base plate 4 about a gripper pivot axis 12 of a gripper rocker shaft 13.
  • the Barell gripper 11 is also referred to as a Barell shuttle.
  • the gripper pivot axis 12 extends horizontally and parallel to the arm shaft 5.
  • the barell gripper 11 cooperates with the sewing needle 10 for stitch and seam formation in the fabric. Due to the parallelism of the gripper pivot axis 12 to the arm shaft 5, a swinging movement of the barell gripper 11 is parallel to a transport direction of the fabric.
  • the transport direction is perpendicular to the C-shape of the sewing machine 1, which is formed by the arm 2, the stator 3 and the base plate 4.
  • the course of the gripper pivot axis 12 parallel to the arm shaft 5 allows equipment of the sewing machine 1 with a needle transport device, since the needle during operation of the sewing machine 1 can move after the puncture in the sewing in the sewing direction, without the needle in this case in a trajectory of the Barell gripper 11 device.
  • the oscillating drive of the barell gripper 11 takes place via a gripper drive 14.
  • Fig. 2 shows the components of the gripper drive 14.
  • the gripper drive 14 has a drive unit 15 for generating a transmission oscillating movement (double arrow 16 in the Fig. 2 ) about a transmission oscillating axis 17 (see. Fig. 1 ).
  • the transmission oscillating axis 17 runs parallel to the shafts 5 and 13.
  • the drive unit 15 has a connecting rod 18.
  • a rod end of the connecting rod 18 is designed as a rod eye 19, which is in drive connection via an eccentric unit 20 with the drive shaft 5.
  • the eccentric unit 20 is placed directly on the drive shaft 5.
  • the other rod end of the connecting rod 18 is also formed as a rod eye 21 and communicates with a transmission wheel 22 via an axial / radial bearing 23 (see. Fig. 4 and 6 ) in transmission connection.
  • the transmission wheel 22 is pivotable about the transmission vibration axis 17 on a bearing bushing 23a (see. Fig. 5 ) stored.
  • crank rod 18 is in transmission communication with the transmission wheel 22 for swinging it back and forth about the transmission vibration axis 17.
  • a traction means 25 of a traction mechanism 26 of the gripper drive 14 is guided.
  • the traction means 25 is designed as a toothed belt. This meshes with an external toothing on the outer circumference 24 of the transmission wheel 22.
  • the traction mechanism 26 is used to transmit the transmission oscillatory movement 16 of the transmission wheel 22 about the transmission oscillation axis 17 in a drive-oscillating movement (see, double arrow 27 in the Fig. 2 ) of the gripper rocking shaft 13.
  • the traction mechanism 26 has a ratio in the range of 3: 1.
  • the transmission gear 22 performs a transmission swinging motion having a circumferential amplitude of 90 ° about the transmission swinging shaft 17
  • the shuttle swinging shaft 13 performs a drive swinging motion with an amplitude of 270 ° around the shuttle swinging shaft 12 due to the action of the tension transmission 26, so
  • a gripping body 28 of the barell gripper 11 performs a pivoting movement about 270 ° about the gripper pivot axis 12.
  • the traction means 25 of the traction mechanism 26 is designed as an endless toothed belt and is guided around a stator-side end of the gripper shaft 13 drive connecting. Under tension, the traction means 25 is held by a clamping unit 29, which is designed as a tensioning roller which is rotatably mounted on the frame 5 a (see. Fig. 2 ).
  • the arm shaft 5 is rotationally driven by the high-performance motor 7.
  • This arm shaft rotation conveys an up and down movement via the eccentric unit 20 (see double arrow 30 of the connecting rod 18).
  • This up and down movement 30 is transferred to the transmission oscillatory motion 16 due to the transmission connection of the rod eye 21 with the transmission wheel 22.
  • the transmission oscillating motion is transferred to the transmission oscillating axis 17 in the drive oscillating movement 27 of the gripper rocker shaft 13.
  • the gripper body 28 of the barell gripper 11 moves synchronously with the needle 10 and grips an upper thread loop, which is passed through the fabric with the needle 10 and knots this by the upper thread during the 270 ° movement of the gripper body 28 is guided around a gripper housing 31 and knotted.
  • the gripper drive 14 with the traction mechanism 26 avoids extreme mechanical stresses in the region of the reversal points of the drive oscillation movement of the gripper oscillation shaft 13.
  • Fig. 5 shows more in detail a stator-side axial / radial bearing 32 of the gripper shaft 13 on the frame 5a of the sewing machine 1 and an axial / radial bearing 33 of the transmission wheel 22 about the transmission axis 17. This bearing takes place on the bearing bush 23a, the rotation with connected to the frame 5a.
  • Fig. 6 shows another axial / radial bearing 35 for supporting the tension roller 29 on a bearing bush 36, which in turn is firmly clamped to the frame 5a.
  • Fig. 7 shows a further embodiment of a gripper drive 37 for the Barell gripper 11.
  • a triangular eccentric unit 38 serves to transmit the rotational movement of the arm shaft 5 into the up and down movement 30 of the crank 18.
  • the arm shaft 5 is connected in a rotationally fixed manner to a triangular eccentric body which is in a Surface eccentric receptacle 40 rotates.
  • the triangular eccentric body 39 has an outer peripheral wall in the form of a spherical triangle.
  • An inner jacket wall of the four-surface eccentric receptacle 40 in the form of a spherical square is matched to this.
  • the triangular eccentric unit 38 avoids extreme mechanical loads at reversal points of the up and down movement 30 of the connecting rod 18th
  • gripper drives 14 or 37 traction mechanism can be used with a ratio in the range of 2: 1 to 4: 1.

Description

Die Erfindung betrifft eine Nähmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a sewing machine according to the preamble of claim 1.

Eine derartige Nähmaschine ist durch offenkundige Vorbenutzung bekannt. Die US 6 032 597 A zeigt eine Nähmaschine mit einer Nadelstange, einem Greifer und einem Greiferantrieb. Eine Greifer-Schwingwelle verläuft senkrecht zu einer Antriebswelle. Ferner zeigt die DE 25 53 363 A1 eine Nähmaschine mit einer Vorrichtung zum Erzeugen einer Schwenk- bzw. Pendelbewegung an einer Abtriebswelle über eine Antriebswelle. An der Antriebswelle sind dabei zwei Exzenterscheiben vorgesehen, die jeweils von flexiblen Verbindungsteilen umschlungen sind, welche eine Rotationsbewegung der Antriebswelle in ein eine Schwenkbewegung der Abtriebswelle übertragen. Die Greiferantriebe von bekannten Nähmaschinen unterliegen, insbesondere dann, wenn die Nähmaschinen zum Nähen von sehr widerstandsfähigem Nähgut eingesetzt werden, einem hohen Verschleiß. Zudem sind die Greiferantriebe laut.Such a sewing machine is known by public prior use. The US 6 032 597 A shows a sewing machine with a needle bar, a gripper and a gripper drive. A gripper swing shaft is perpendicular to a drive shaft. Furthermore, the shows DE 25 53 363 A1 a sewing machine with a device for generating a pivoting or oscillating movement on an output shaft via a drive shaft. On the drive shaft while two eccentric discs are provided, which are each wrapped by flexible connecting parts, which transmit a rotational movement of the drive shaft in a pivotal movement of the output shaft. The gripper drives of known sewing machines are subject to high wear, in particular when the sewing machines are used for sewing very resistant sewing material. In addition, the gripper drives are loud.

Es ist eine Aufgabe der vorliegenden Erfindung, den Greiferantrieb so weiterzubilden, dass eine mechanische Beanspruchung von Komponenten des Greiferantriebs reduziert ist.It is an object of the present invention to further develop the gripper drive so that a mechanical stress on components of the gripper drive is reduced.

Diese Aufgabe ist erfindungsgemäß gelöst durch eine Nähmaschine mit einem Greiferantrieb mit den im Anspruch 1 angegebenen Merkmalen.This object is achieved by a sewing machine with a gripper drive with the features specified in claim 1.

Erfindungsgemäß wurde erkannt, dass ein derartiger Greiferantrieb, der auch als Schwing- bzw. Pendel-Greiferantrieb bekannt ist, durch den Einsatz eines Zugmittelgetriebes Extrembelastungen im Bereich der Umkehrpunkte der Antriebs-Schwingbewegung der Greifer-Schwingwelle reduziert. Dies vermindert zum einen Verschleiß an den Komponenten des Greiferantriebs. Zum anderen reduziert dies auch die Geräuschentwicklung des Greiferantriebs. Ferner ist eine Antriebseinheit mit einer direkt auf die Antriebswelle aufgesetzten Exzentereinheit sehr robust. Durch eine derartige Gestaltung der Antriebseinheit können ferner Bauteile eingespart und der konstruktive Aufwand der Nähmaschine verringert werden.According to the invention, it has been recognized that such a gripper drive, which is also known as oscillating or pendulum gripper drive, reduces extreme loads in the area of the reversal points of the drive oscillation movement of the gripper oscillation shaft by the use of a traction mechanism transmission. This reduces wear on the components of the gripper drive. On the other hand, this also reduces the noise of the gripper drive. Furthermore, a drive unit with a directly mounted on the drive shaft eccentric is very robust. By such a design of the drive unit further components can be saved and the design effort of the sewing machine can be reduced.

Eine Antriebseinheit nach Anspruch 2 ist konstruktiv einfach und überträgt die Schwenkbewegung des Transmissionsrades sicher in eine Schwingbewegung der Greifer-Schwingwelle.A drive unit according to claim 2 is structurally simple and securely transmits the pivoting movement of the transmission wheel in a swinging movement of the gripper rocker shaft.

Eine Antriebseinheit nach Anspruch 3 leitet die Antriebsbewegung des Greifers von der Armwellen-Drehbewegung ab. Grundsätzlich kann die Antriebswelle des Greiferantriebs aber auch eine unabhängig von der Armwelle angetriebene Welle sein. Schließlich ist es auch möglich, die Nähmaschine ohne Armwelle auszuführen.A drive unit according to claim 3 derives the drive movement of the gripper from the arm shaft rotation. In principle, however, the drive shaft of the gripper drive can also be a shaft driven independently of the arm shaft. Finally, it is also possible to execute the sewing machine without arm shaft.

Eine Dreiecks-Exzentereinheit nach Anspruch 4 kann zu einer Reduzierung einer mechanischen Belastung der Kurbelstange führen. Zudem ist es möglich, eine Winkelgeschwindigkeit der Antriebs-Schwingbewegung der Greifer-Schwingwelle fein auf die Bewegung der Nadelstange abzustimmen, was die Nähsicherheit erhöht.A triangular cam unit according to claim 4 can lead to a reduction of mechanical stress on the connecting rod. In addition, it is possible to fine-tune an angular velocity of the drive swinging motion of the hook swinging shaft to the movement of the needle bar, which enhances sewing safety.

Ein Zahnriemen nach Anspruch 5 ist robust. Der Zahnriemen kann eine Grundelastizität aufweisen, die einen Impulsübertrag im Bereich der Umkehrpunkte der Antriebs-Schwingbewegung reduziert und somit einerseits zur Verschleiß- und andererseits zur Geräuschminderung beiträgt.A toothed belt according to claim 5 is robust. The toothed belt may have a basic elasticity which reduces a momentum transfer in the region of the reversal points of the drive oscillation movement and thus contributes on the one hand to wear and, on the other hand, to noise reduction.

Ein Übersetzungsverhältnis nach Anspruch 6 hat sich in der Praxis bewährt. Eine Winkelamplitude der Transmissions-Schwingbewegung wird in eine um das Übersetzungsverhältnis vergrößerte Winkelamplitude der Antriebs-Schwingbewegung überführt. Das Übersetzungsverhältnis kann im Bereich von 2:1 bis 4:1 liegen. Die Winkelamplitude der Antriebs-Schwingbewegung kann größer sein als 180°. Bevorzugt ist die Winkelamplitude der Antriebs-Schwingbewegung größer als 200°, größer als 220°, größer als 250° und liegt bevorzugt im Bereich von 270°. Eine Winkelamplitude der Antriebs-Schwingbewegung größer als 180° kann sicherstellen, dass ein Oberfaden zur Verknotung um ein Greifergehäuse der Nähmaschine herumgeführt wird.A transmission ratio according to claim 6 has proven itself in practice. An angular amplitude of the transmission oscillation movement is converted into an angle amplitude of the drive oscillation movement which is increased by the transmission ratio. The gear ratio can range from 2: 1 to 4: 1. The angular amplitude of the drive oscillation movement can be greater than 180 °. Preferably, the angle amplitude of the drive oscillation movement is greater than 200 °, greater than 220 °, greater than 250 ° and is preferably in the range of 270 °. An angular amplitude of the drive swinging motion greater than 180 ° can ensure that an upper thread is guided around a gripper housing of the sewing machine for knotting.

Eine Nähmaschine nach Anspruch 7 mit einer Greifer-Schwingachse, die horizontal und parallel zur Armwelle verläuft, ermöglicht die Verwendung der erfindungsgemäßen Nähmaschine für einen Nadeltransport des Nähguts.A sewing machine according to claim 7 with a gripper swinging axis, which runs horizontally and parallel to the arm shaft, allows the use of the sewing machine according to the invention for a needle transport of the material.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:

Fig. 1
perspektivisch eine bedienerseitige Ansicht einer Nähmaschine zum Vernähen von schwerem bzw. widerstandsfähigem Nähgut, wobei auch teilweise innenliegende Details einer Maschinenmechanik wiedergegeben sind;
Fig. 2
einen Greiferantrieb für einen Barell-Greifer der Nähmaschine nach Fig. 1 in einer der Fig. 1 entsprechenden Perspektive;
Fig. 3
den Greiferantrieb aus Blickrichtung III in Fig. 2, also in einer seitlichen Aufsicht;
Fig. 4
eine Ansicht des Greiferantriebs aus Blickrichtung IV in Fig. 3;
Fig. 5
einen Schnitt V-V durch Fig. 3 durch einen Abschnitt des Greiferantriebs im Bereich eines Zugmittelgetriebes von diesem;
Fig. 6
ein Detail VI aus Fig. 4; und
Fig. 7
in einer zu Fig. 1 ähnlichen Darstellung eine Nähmaschine mit einer weiteren Ausführung eines Greiferantriebs.
Embodiments of the invention will be explained in more detail with reference to the drawing. In this show:
Fig. 1
in perspective, a user-side view of a sewing machine for sewing heavy or durable fabric, which also partially internal details of a machine mechanism are shown;
Fig. 2
a gripper drive for a Barell gripper of the sewing machine after Fig. 1 in one of the Fig. 1 appropriate perspective;
Fig. 3
the gripper drive from the direction of III in Fig. 2 So in a lateral supervision;
Fig. 4
a view of the gripper drive from the direction of view IV in Fig. 3 ;
Fig. 5
a cut VV through Fig. 3 by a portion of the gripper drive in the region of a traction mechanism of this;
Fig. 6
a detail VI Fig. 4 ; and
Fig. 7
in one too Fig. 1 similar representation of a sewing machine with a further embodiment of a gripper drive.

Eine Nähmaschine 1 hat einen oberen Arm 2, einen vertikalen Ständer 3 und ein unteres Gehäuse, das üblicherweise als Grundplatte 4 bezeichnet ist. Die Nähmaschine 1 ist ausgelegt zum Vernähen von schwerem bzw. widerstandsfähigem Nähgut, z. B. von Leder oder von Kunststoffplatten. Die Komponenten 2 bis 4 sind in der Fig. 1 lediglich, was ihre Konturen angeht, angedeutet.A sewing machine 1 has an upper arm 2, a vertical stand 3 and a lower housing, which is commonly referred to as a base plate 4. The sewing machine 1 is designed for sewing heavy or durable material, eg. As leather or plastic plates. The components 2 to 4 are in the Fig. 1 only as far as their contours are concerned.

Im Arm 2 ist eine Armwelle 5 drehbar an einem schematisch in der Fig. 1 angedeuteten Rahmen 5a gelagert. Eines dieser Armwellenlager ist im Bereich eines ständerseitigen Armwellenendes und ein anderes der Armwellenlager im Bereich eines gegenüberliegenden Armwellenendes in einem Kopf 6 der Nähmaschine 1 angeordnet. Der Antrieb der Armwelle 5 und damit auch der wesentlichen Nähkomponenten der Nähmaschine 1 erfolgt über einen schematisch in der Fig. 1 angedeuteten Hochleistungsmotor 7. Über die Armwelle 5 und einen Kurbeltrieb 8 ist eine im Kopf 6 vertikal gelagerte Nadelstange 9 vertikal auf- und abgehend antreibbar, die an ihrem unteren Ende eine Nadel 10 trägt.In the arm 2, an arm shaft 5 is rotatable on a schematically in the Fig. 1 indicated frame 5a stored. One of these arm shaft bearings is in the area of a stand-side arm shaft end and another of the arm shaft bearings arranged in the region of an opposite Armwellenendes in a head 6 of the sewing machine 1. The drive of the arm shaft 5 and thus also the essential sewing components of the sewing machine 1 via a schematic in the Fig. 1 indicated high-power motor 7. About the arm shaft 5 and a crank mechanism 8 is a vertically mounted in the head 6 needle bar 9 vertically up and down driven, which carries a needle 10 at its lower end.

Unterhalb der Nadelstange 9 ist in der Grundplatte 4 ein Barell-Greifer 11 um eine Greifer-Schwingachse 12 einer Greifer-Schwingwelle 13 hin- und herschwingend angetrieben. Der Barell-Greifer 11 wird auch als Barell-Schiffchen bezeichnet. Die Greifer-Schwingachse 12 verläuft horizontal und parallel zur Armwelle 5. Der Barell-Greifer 11 wirkt mit der Nähnadel 10 zur Stich- und Nahtbildung im Nähgut zusammen. Aufgrund der Parallelität der Greifer-Schwingachse 12 zur Armwelle 5 erfolgt eine Schwingbewegung des Barell-Greifers 11 parallel zu einer Transportrichtung des Nähguts. Die Transportrichtung verläuft senkrecht zur C-Form der Nähmaschine 1, die durch den Arm 2, den Ständer 3 und die Grundplatte 4 gebildet ist. Der Verlauf der Greifer-Schwingachse 12 parallel zur Armwelle 5 ermöglicht eine Ausrüstung der Nähmaschine 1 mit einer Nadeltransporteinrichtung, da die Nadel beim Betrieb der Nähmaschine 1 sich nach dem Einstich in das Nähgut in der Nährichtung bewegen kann, ohne dass die Nadel hierbei in eine Bewegungsbahn des Barell-Greifers 11 gerät.Below the needle bar 9, a barell gripper 11 is driven back and forth in the base plate 4 about a gripper pivot axis 12 of a gripper rocker shaft 13. The Barell gripper 11 is also referred to as a Barell shuttle. The gripper pivot axis 12 extends horizontally and parallel to the arm shaft 5. The barell gripper 11 cooperates with the sewing needle 10 for stitch and seam formation in the fabric. Due to the parallelism of the gripper pivot axis 12 to the arm shaft 5, a swinging movement of the barell gripper 11 is parallel to a transport direction of the fabric. The transport direction is perpendicular to the C-shape of the sewing machine 1, which is formed by the arm 2, the stator 3 and the base plate 4. The course of the gripper pivot axis 12 parallel to the arm shaft 5 allows equipment of the sewing machine 1 with a needle transport device, since the needle during operation of the sewing machine 1 can move after the puncture in the sewing in the sewing direction, without the needle in this case in a trajectory of the Barell gripper 11 device.

Der Schwingantrieb des Barell-Greifers 11 erfolgt über einen Greiferantrieb 14. Fig. 2 zeigt die Komponenten des Greiferantriebs 14. Der Greiferantrieb 14 hat eine Antriebseinheit 15 zur Erzeugung einer Transmissions-Schwingbewegung (Doppelpfeil 16 in der Fig. 2) um eine Transmissions-Schwingachse 17 (vgl. Fig. 1).The oscillating drive of the barell gripper 11 takes place via a gripper drive 14. Fig. 2 shows the components of the gripper drive 14. The gripper drive 14 has a drive unit 15 for generating a transmission oscillating movement (double arrow 16 in the Fig. 2 ) about a transmission oscillating axis 17 (see. Fig. 1 ).

Die Transmissions-Schwingachse 17 verläuft parallel zu den Wellen 5 und 13.The transmission oscillating axis 17 runs parallel to the shafts 5 and 13.

Als umlaufende Antriebswelle der Antriebseinheit 15 dient die Armwelle 5. Weiterhin hat die Antriebseinheit 15 eine Kurbelstange 18. Ein Stangenende der Kurbelstange 18 ist als Stangenauge 19 ausgebildet, welches über eine Exzentereinheit 20 mit der Antriebswelle 5 in Antriebsverbindung steht. In der bevorzugten Ausführungsvariante gemäß den Fig. 1 bis Fig. 6 ist die Exzentereinheit 20 direkt auf die Antriebswelle 5 aufgesetzt. Das andere Stangenende der Kurbelstange 18 ist ebenfalls als Stangenauge 21 ausgebildet und steht mit einem Transmissionsrad 22 über ein Axial-/Radiallager 23 (vgl. Fig. 4 und 6) in Transmissionsverbindung. Das Transmissionsrad 22 ist schwenkbar um die Transmissions-Schwingachse 17 an einer Lagerbuchse 23a (vgl. Fig. 5) gelagert.Furthermore, the drive unit 15 has a connecting rod 18. A rod end of the connecting rod 18 is designed as a rod eye 19, which is in drive connection via an eccentric unit 20 with the drive shaft 5. In the preferred embodiment according to the Fig. 1 to Fig. 6 the eccentric unit 20 is placed directly on the drive shaft 5. The other rod end of the connecting rod 18 is also formed as a rod eye 21 and communicates with a transmission wheel 22 via an axial / radial bearing 23 (see. Fig. 4 and 6 ) in transmission connection. The transmission wheel 22 is pivotable about the transmission vibration axis 17 on a bearing bushing 23a (see. Fig. 5 ) stored.

Die Kurbelstange 18 steht mit dem Transmissionsrad 22 zum Hin- und Herschwenken von diesem um die Transmissions-Schwingachse 17 in Transmissionsverbindung.The crank rod 18 is in transmission communication with the transmission wheel 22 for swinging it back and forth about the transmission vibration axis 17.

Über einen Außenumfang 24 des Transmissionsrades 22 ist ein Zugmittel 25 eines Zugmittelgetriebes 26 des Greiferantriebs 14 geführt. Das Zugmittel 25 ist als Zahnriemen ausgeführt. Dieser kämmt mit einer Außenverzahnung am Außenumfang 24 des Transmissionsrades 22.About an outer periphery 24 of the transmission wheel 22, a traction means 25 of a traction mechanism 26 of the gripper drive 14 is guided. The traction means 25 is designed as a toothed belt. This meshes with an external toothing on the outer circumference 24 of the transmission wheel 22.

Das Zugmittelgetriebe 26 dient zur Übertragung der Transmissions-Schwingbewegung 16 des Transmissionsrades 22 um die Transmissions-Schwingachse 17 in eine Antriebs-Schwingbewegung (vgl. Doppelpfeil 27 in der Fig. 2) der Greifer-Schwingwelle 13.The traction mechanism 26 is used to transmit the transmission oscillatory movement 16 of the transmission wheel 22 about the transmission oscillation axis 17 in a drive-oscillating movement (see, double arrow 27 in the Fig. 2 ) of the gripper rocking shaft 13.

Das Zugmittelgetriebe 26 hat eine Übersetzung im Bereich von 3:1. Wenn das Transmissionsrad 22 um die Transmissions-Schwingachse 17 eine Transmissionsschwingbewegung mit einer Umfangsamplitude von 90° vollführt, vollführt aufgrund der Wirkung des Zugmittelgetriebes 26 die Greifer-Schwingwelle 13 eine Antriebs-Schwingbewegung mit einer Amplitude von 270° um die Greifer-Schwingachse 12, sodass entsprechend ein Greifkörper 28 des Barell-Greifers 11 eine Schwenkbewegung um 270° um die Greifer-Schwingachse 12 vollführt.The traction mechanism 26 has a ratio in the range of 3: 1. When the transmission gear 22 performs a transmission swinging motion having a circumferential amplitude of 90 ° about the transmission swinging shaft 17, the shuttle swinging shaft 13 performs a drive swinging motion with an amplitude of 270 ° around the shuttle swinging shaft 12 due to the action of the tension transmission 26, so Correspondingly, a gripping body 28 of the barell gripper 11 performs a pivoting movement about 270 ° about the gripper pivot axis 12.

Das Zugmittel 25 des Zugmittelgetriebes 26 ist als Endlos-Zahnriemen ausgeführt und ist um ein ständerseitiges Ende der Greifer-Schwingwelle 13 antriebsverbindend herumgeführt. Unter Spannung wird das Zugmittel 25 durch eine Spanneinheit 29 gehalten, die als Spannrolle ausgeführt ist, die drehbar am Rahmen 5a gelagert ist (vgl. Fig. 2).The traction means 25 of the traction mechanism 26 is designed as an endless toothed belt and is guided around a stator-side end of the gripper shaft 13 drive connecting. Under tension, the traction means 25 is held by a clamping unit 29, which is designed as a tensioning roller which is rotatably mounted on the frame 5 a (see. Fig. 2 ).

Beim Betrieb der Nähmaschine 1 wird die Armwelle 5 vom Hochleistungsmotor 7 drehangetrieben. Diese Armwellendrehung vermittelt über die Exzentereinheit 20 eine Auf- und Abbewegung (vgl. Doppelpfeil 30 der Kurbelstange 18). Diese Auf- und Abbewegung 30 wird in die Transmissions-Schwingbewegung 16 aufgrund der Transmissionsverbindung des Stangenauges 21 mit dem Transmissionsrad 22 überführt. Über das Zugmittelgetriebe 26 wird die Transmissions-Schwingbewegung um die Transmissions-Schwingachse 17 in die Antriebs-Schwingbewegung 27 der Greifer-Schwingwelle 13 überführt. Zur Stich- und Nahtbildung bewegt sich der Greiferkörper 28 des Barell-Greifers 11 synchron mit der Nadel 10 und ergreift eine Oberfaden-Schlinge, die mit der Nadel 10 durch das Nähgut hindurchgeführt wird und verknotet diese, indem der Oberfaden während der 270°-Bewegung des Greiferkörpers 28 um ein Greifergehäuse 31 herungeführt und verknotet wird.During operation of the sewing machine 1, the arm shaft 5 is rotationally driven by the high-performance motor 7. This arm shaft rotation conveys an up and down movement via the eccentric unit 20 (see double arrow 30 of the connecting rod 18). This up and down movement 30 is transferred to the transmission oscillatory motion 16 due to the transmission connection of the rod eye 21 with the transmission wheel 22. About the traction mechanism 26, the transmission oscillating motion is transferred to the transmission oscillating axis 17 in the drive oscillating movement 27 of the gripper rocker shaft 13. For stitch and seam formation, the gripper body 28 of the barell gripper 11 moves synchronously with the needle 10 and grips an upper thread loop, which is passed through the fabric with the needle 10 and knots this by the upper thread during the 270 ° movement of the gripper body 28 is guided around a gripper housing 31 and knotted.

Der Greiferantrieb 14 mit dem Zugmittelgetriebe 26 vermeidet mechanische Extrembelastungen im Bereich der Umkehrpunkte der Antriebs-Schwingbewegung der Greifer-Schwingwelle 13.The gripper drive 14 with the traction mechanism 26 avoids extreme mechanical stresses in the region of the reversal points of the drive oscillation movement of the gripper oscillation shaft 13.

Fig. 5 zeigt stärker im Detail ein ständerseitiges Axial-/Radiallager 32 der Greifer-Schwingwelle 13 am Rahmen 5a der Nähmaschine 1 sowie ein Axial-/Radiallager 33 des Transmissionsrades 22 um die Transmissions-Schwingachse 17. Diese Lagerung erfolgt an der Lagerbuchse 23a, die drehfest mit dem Rahmen 5a verbunden ist. Fig. 5 shows more in detail a stator-side axial / radial bearing 32 of the gripper shaft 13 on the frame 5a of the sewing machine 1 and an axial / radial bearing 33 of the transmission wheel 22 about the transmission axis 17. This bearing takes place on the bearing bush 23a, the rotation with connected to the frame 5a.

Fig. 6 zeigt ein weiteres Axial-/Radiallager 35 zur Lagerung der Spannrolle 29 an einer Lagerbuchse 36, die wiederum fest mit dem Rahmen 5a verspannt ist. Fig. 6 shows another axial / radial bearing 35 for supporting the tension roller 29 on a bearing bush 36, which in turn is firmly clamped to the frame 5a.

Fig. 7 zeigt eine weitere Ausführung eines Greiferantriebs 37 für den Barell-Greifer 11. Komponenten und Funktionen, die vorstehend unter Bezugnahme auf die Fig. 1 bis 6 bereits erläutert wurden, tragen die gleichen Bezugsziffern und werden nicht nochmals im Einzelnen diskutiert. Im Unterschied zur Rund-Exzentereinheit 20 dient zur Übertragung der Drehbewegung der Armwelle 5 in die Auf- und Abbewegung 30 der Kurbel 18 eine Dreiecks-Exzenterheinheit 38. Die Armwelle 5 steht dabei drehfest mit einem Dreiecks-Exzenterkörper in Verbindung, der in einer Vier-Flächen-Exzenteraufnahme 40 umläuft. Der Dreiecks-Exzenterkörper 39 hat eine äußere Mantelwand in Form eines sphärischen Dreiecks. Hierauf abgestimmt ist eine innere Mantelwand der Vier-Flächen-Exzenteraufnahme 40 in Form eines sphärischen Quadrats. Die Dreiecks-Exzentereinheit 38 vermeidet extreme mechanische Belastungen an Umkehrpunkten der Auf- und Abbewegung 30 der Kurbelstange 18. Fig. 7 shows a further embodiment of a gripper drive 37 for the Barell gripper 11. Components and functions described above with reference to the Fig. 1 to 6 already described, bear the same reference numbers and will not be discussed again in detail. In contrast to the round eccentric unit 20, a triangular eccentric unit 38 serves to transmit the rotational movement of the arm shaft 5 into the up and down movement 30 of the crank 18. The arm shaft 5 is connected in a rotationally fixed manner to a triangular eccentric body which is in a Surface eccentric receptacle 40 rotates. The triangular eccentric body 39 has an outer peripheral wall in the form of a spherical triangle. An inner jacket wall of the four-surface eccentric receptacle 40 in the form of a spherical square is matched to this. The triangular eccentric unit 38 avoids extreme mechanical loads at reversal points of the up and down movement 30 of the connecting rod 18th

Bei einer alternativen Ausführung der Greiferantriebe 14 oder 37 können Zugmittelgetriebe mit einer Übersetzung im Bereich von 2:1 bis 4:1 zum Einsatz kommen.In an alternative embodiment of the gripper drives 14 or 37 traction mechanism can be used with a ratio in the range of 2: 1 to 4: 1.

Claims (7)

  1. Sewing machine (1)
    - with a frame (5a),
    - with a needle bar (9), which is driven to go up and down, with a sewing needle (10),
    - with a looper (11), which is driven by a looper drive (14; 37) to oscillate back and forth about a looper oscillating axis (12) of a looper oscillating shaft (13) and cooperates with the sewing needle (10) for stitch formation,
    - wherein the looper drive (14; 37) comprises:
    - - a drive unit (15) to produce a transmission oscillating movement (16) about a transmission oscillating axis (17),
    - - a traction drive (26) with a traction means (25) to convert the transmission oscillating movement (16) about the transmission oscillating axis (17) into a drive oscillating movement (27) of the looper oscillating shaft (13),
    characterized in that the drive unit (15) comprises:
    - a revolving drive shaft (5),
    - a crankshaft (18),
    - - one shaft end (19) of which has a drive connection by means of an eccentric unit (20; 38) to the drive shaft (5), wherein the eccentric unit (20; 38) is placed directly on the drive shaft (5),
    - - the other shaft end (21) of which has a transmission connection to a transmission wheel (22), which is pivotably mounted on the frame (5) and is pivotably mounted about the transmission oscillating axis (17), to pivot the transmission wheel (22) back and forth.
  2. Sewing machine according to claim 1, characterized in that the traction means (25) of the traction drive (26) is guided over an external periphery (24) of the transmission wheel (22).
  3. Sewing machine according to claim 1 or 2, characterized in that the drive shaft (5) is simultaneously an arm shaft, by means of which the needle bar (9) is driven.
  4. Sewing machine according to any one of claims 1 to 3, characterized in that the eccentric unit is configured as a triangular eccentric unit (38).
  5. Sewing machine according to any one of claims 1 to 4, characterized by a toothed belt (26) as the traction means of the traction drive (26).
  6. Sewing machine according to any one of claims 1 to 5, characterized in that the traction drive (26) has a transmission ratio in the region of 3:1.
  7. Sewing machine according to any one of claims 1 to 6, characterized in that the looper oscillating axis (12) runs horizontally and parallel to the arm shaft (5).
EP13161010.7A 2012-04-16 2013-03-26 Sewing machine Active EP2653599B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012206208A DE102012206208A1 (en) 2012-04-16 2012-04-16 sewing machine

Publications (2)

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EP2653599A1 EP2653599A1 (en) 2013-10-23
EP2653599B1 true EP2653599B1 (en) 2014-04-16

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EP (1) EP2653599B1 (en)
JP (1) JP6148893B2 (en)
KR (1) KR101978310B1 (en)
CN (1) CN103374799B (en)
DE (1) DE102012206208A1 (en)
TW (1) TWI563141B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015220332A1 (en) * 2015-10-19 2017-04-20 Pfaff Industriesysteme Und Maschinen Gmbh sewing

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250696A (en) * 1938-10-14 1941-07-29 Reece Button Hole Machine Co Sewing mechanism
CH290563A (en) * 1951-04-25 1953-05-15 Orelli Franz Von Hook drive device on a sewing machine.
CA1065596A (en) 1974-11-27 1979-11-06 Gerhart P. Klein Means and method for applying material to a substrate
JPS5162253A (en) * 1974-11-29 1976-05-29 Shimokawa Wataru Ofukukaitenundohatsuseisochi
JP2684661B2 (en) * 1987-12-24 1997-12-03 アイシン精機株式会社 Sewing machine needle hook timing adjustment device
JPH1085473A (en) * 1996-09-13 1998-04-07 Juki Corp Half rotation shuttle for sewing machine
US6032597A (en) * 1997-09-30 2000-03-07 Brother Kogyo Kabushiki Kaisha Shuttle hook driver for sewing machine
JP3693145B2 (en) * 1998-05-21 2005-09-07 ブラザー工業株式会社 Sewing machine half turn hook drive
JP2004049257A (en) * 2002-07-16 2004-02-19 Juki Corp Power transmission mechanism of sewing machine
JP5084190B2 (en) * 2006-07-05 2012-11-28 Ｊｕｋｉ株式会社 sewing machine

Also Published As

Publication number Publication date
CN103374799A (en) 2013-10-30
CN103374799B (en) 2016-06-15
KR20130116818A (en) 2013-10-24
KR101978310B1 (en) 2019-05-14
JP2013220358A (en) 2013-10-28
EP2653599A1 (en) 2013-10-23
TWI563141B (en) 2016-12-21
DE102012206208A1 (en) 2013-10-17
JP6148893B2 (en) 2017-06-14
TW201348550A (en) 2013-12-01

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