EP1576224B1 - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
EP1576224B1
EP1576224B1 EP03785896A EP03785896A EP1576224B1 EP 1576224 B1 EP1576224 B1 EP 1576224B1 EP 03785896 A EP03785896 A EP 03785896A EP 03785896 A EP03785896 A EP 03785896A EP 1576224 B1 EP1576224 B1 EP 1576224B1
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EP
European Patent Office
Prior art keywords
lifter
lever
hook
sewing machine
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03785896A
Other languages
German (de)
French (fr)
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EP1576224A1 (en
Inventor
Christoph Heckner
Markus Richter
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 date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Priority to SI200330549T priority Critical patent/SI1576224T1/en
Publication of EP1576224A1 publication Critical patent/EP1576224A1/en
Application granted granted Critical
Publication of EP1576224B1 publication Critical patent/EP1576224B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks
    • D05B57/143—Vertical axis type
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D05B57/265—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices for looptakers with vertical axis

Definitions

  • the invention relates to a sewing machine.
  • such a sewing machine which has an arm, a base plate and a needle in the arm driven up and down driven for guiding a needle thread. It also has a mounted in a gripper bearing housing in the base plate, circumferentially drivable in a rotational direction by means of a vertical gripper drive shaft gripper and mounted in the base plate drivable transmission shaft. Further, a transmission gear arranged between the transmission shaft and the gripper drive shaft is provided for driving the gripper drive shaft at twice the speed of the transmission shaft.
  • a freely against this rotatably mounted bobbin case is arranged, which receives a coil, is provided with a fan cam and has a holding web which prevents rotation of the bobbin case in the direction of rotation with a relative to the base plate stationary retaining cam.
  • a capsule fan is provided, which has an insertable against the fan cam fan lever and a non-rotatably connected actuating lever.
  • a capsule fan drive having a cam with a circumferential cam surface. This cam is driven by the gripper drive shaft via a reduction gear at half the speed of the gripper.
  • the actuation lever abuts against the circumferential curve surface.
  • a retaining device for a bobbin case is known.
  • the gripper drive shaft of a rotatable about a vertical axis gripper is driven via a bevel gear by a transmission shaft, the drive in turn is derived from the sewing machine drive.
  • an eccentrically arranged cylinder is mounted as a cam, which drives a fan lever for the bobbin case via a spring-loaded lever.
  • the scanning lever is pivoted and then releases the bobbin case or holds it.
  • the invention has for its object to design a sewing machine of the generic type so that the drive of the capsule fan works with particularly simple and reliable means.
  • the illustrated in Fig. 1 double lockstitch sewing machine has in a conventional manner an upper arm 1, a vertical stand 2 and a lower box-like base plate 3.
  • an arm shaft 4 is mounted, via which a needle bar 5 with needle 6 up and down driven. Furthermore, a thread lever 7 is driven by it.
  • a vertical gripper 8 that is a about a vertical axis 9 rotatably driven double lockstitch gripper 8, stored.
  • a gripper drive shaft 10 carrying the gripper 8, which can be driven about the axis 9, is rotatably mounted in a gripper bearing housing 11 arranged in the base plate 3. It is driven by means of a transmission shaft 12 by means of a bevel gear 13.
  • the transmission wave 12 in turn is driven by a toothed belt drive 14 of the arm shaft 4.
  • the toothed belt drive 14 has a transmission ratio of 1: 1.
  • the bevel gear 13 is dimensioned such that a gear ratio of 1: 2 is realized. This means that the gripper 8 rotates twice when the arm shaft 4 and the transmission shaft 12 makes one revolution.
  • the large bevel gear 15 mounted on the transmission shaft 12 has twice the number of teeth as the driven bevel gear 16 mounted on the gripper drive shaft 10.
  • a tap hole plate 17 with a tap hole 18 is attached to the top of the base plate 3.
  • the pot-shaped gripper 8 has a gripper tip 19, which passes directly to the immersed by the needle hole 18 needle 6 and can take a guided in this needle thread 20.
  • a bobbin case 21 is mounted, which is freely rotatable about the axis 9 relative to the gripper 8.
  • the also upwardly open bobbin case 21 has a radially to the axis 9 outwardly and the tap hole plate 17 upwardly projecting retaining web 22 which is held between two formed on the bottom of the tap hole plate 17 retaining cams 23, 24 substantially non-rotatable.
  • a first lateral air gap 25 is located between the first retaining cam 23 and the retaining web 22
  • an upper air gap 26 is located between the retaining web 22 and the needle hole plate 17 and between the retaining web 22 and the second retaining cam 24, a second lateral air gap 27.
  • the air gaps 25, 26, 27 form in the middle position of the holding web 22 shown in FIG. 2, a continuous channel.
  • a bobbin thread 28 receiving coil 29 is arranged, which is held in the bobbin case 21 by means of a releasable locking lever 30.
  • the bobbin case 21 has at its upper edge on a substantially radially to the axis 9 outwardly projecting fan cam 31, which cooperates with a fan lever 32.
  • the fan lever 32 forms an arm of a capsule fan 33.
  • the capsule fan 33 has a fan shaft 34 which rotatably or pivotally mounted in the gripper bearing housing 11 about a vertical axis 35 parallel to the axis 9 in a bearing 36 is. Its axial position relative to the gripper bearing housing 11 is adjusted by a collar 37 and fixed.
  • the fan shaft 34 is part of a capsule fan drive 38. This includes a front side of the drive bevel gear 15 on the shaft 12 by means of a set screw 39 'adjustably mounted axial cam 39 and an abutting against this, rotatably with the fan -Welle 34 connected sensing lever 40.
  • the trained as a bolt scanning lever 40 is inserted transversely into the fan shaft 34 and set adjustable by means of a arranged in the shaft 34 clamping screw 41. With its free end, it bears against the end-face cam surface 42 of the axial cam 39.
  • the sensing lever 40 is pressed against the cam surface 42 by means of a biassed compression coil spring 43.
  • this compression spring 43 is on the one hand against the sensing lever 40 and on the other hand against a setting screw 44 which is mounted in the gripper bearing housing 41. By means of this screw 44, the bias of the compression spring 43 and thus the force can be adjusted by means of which the scanning lever 40 abuts against the cam surface 42.
  • the fan lever 32 is connected by means of a screw 45 with the fan shaft 34, so that an exact adjustment of the capsule fan 33 relative to the fan cam 31 is possible.
  • the compression spring 43 presses the fan lever 32 in the direction of the fan cam 31, of course, only as far as it allows the cam surface 42 in their respective rotational position.
  • the cam surface 42 is bent such that the sensing lever 40 and thus the fan lever 32 perform a harmonic motion upon rotation of the cam 39.
  • the maximum stroke 46 of the cam surface 42 which can be seen in FIG. 5 is reached.
  • the fan lever 32 is farthest from the fan cam 31.
  • the minimum stroke 47 of the cam surface 42 is present, as can be seen in FIG. 5, that is to say the fan lever 32 is located in this area Fan cam 31 and moves the bobbin case 21 counter to the direction of rotation 48 of the gripper.
  • the bobbin case 21 rotates due to the friction between the gripper 8 and bobbin case 21 in the direction of rotation 48 until the holding web 22 on the first holding cam 23rd is applied.
  • the basic procedure is well known as capsule fans. If the fan lever 32 is not applied to the fan cam 31, then is the holding web 22 of the bobbin case 21 due to the entrainment of the bobbin case 21 by the gripper 8 in the direction of rotation 48 against the first holding cam 23 at.
  • the second lateral air gap 27 is in this case increased counter to the representation in Fig. 2, while the first lateral air gap 25 is closed.
  • the fan lever 32 is pivoted so far by abutment of the scanning lever 40 in the region of the maximum stroke 46 of the curved surface 42 that a gap 49 between 1 and 1 between the fan cam 31 and the fan lever 32 , 5 mm wide is formed.
  • the needle thread loop can slide without resistance through the channel formed by the air gaps 25, 26, 27.
  • the needle thread loop is released.
  • the scanning lever 40 is pivoted back by further rotation of the cam surface 42 in the direction of its maximum stroke 46; the gap 49 between the fan lever 32 and the fan cam 31 is opened again, so that the thread loop can slide through this gap 49 without resistance and together with the bobbin thread 28 forms a lockstitch.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Massaging Devices (AREA)
  • Inorganic Insulating Materials (AREA)

Abstract

The sewing machine has a looper (8) which is powered to rotate around a vertical axis, incorporating a bobbin capsule (21) with lifter cams (31). A capsule lifter (33) has a lifter lever (32) to make contact with the cams, and a feeler lever (40). The feeler lever lies against a cam disk surface (42) of an axial cam disk (39), fitted to a transmission shaft with its power taken from the looper drive shaft (10). The feeler lever has an adjustable position along the lifter shaft (34).

Description

Die Erfindung betrifft eine Nähmaschine.The invention relates to a sewing machine.

Aus der DE 100 25 851 C1 ist eine derartige Nähmaschine bekannt, die einen Arm, eine Grundplatte und eine im Arm auf- und abgehend antreibbar abgestützte Nadel zur Führung eines Nadelfadens aufweist. Sie weist weiterhin einen in einem Greiferlager-Gehäuse in der Grundplatte gelagerten, umlaufend in einer Drehrichtung mittels einer vertikalen Greifer-Antriebs-Welle antreibbaren Greifer und eine in der Grundplatte gelagerte antreibbare Übertragungs-Welle auf. Weiterhin ist ein zwischen der Übertragungs-Welle und der Greifer-Antriebs-Welle angeordnetes Übersetzungs-Getriebe zum Antrieb der Greifer-Antriebs-Welle mit der doppelten Drehzahl der Übertragungs-Welle vorgesehen. Im Greifer ist eine frei gegenüber diesem drehbar gelagerte Spulenkapsel angeordnet, die eine Spule aufnimmt, mit einem Lüfter-Nocken versehen ist und einen Halte-Steg aufweist, der mit einem gegenüber der Grundplatte ortsfesten Halte-Nocken eine Drehung der Spulenkapsel in der Drehrichtung verhindert. Weiterhin ist ein Kapsel-Lüfter vorgesehen, der einen gegen den Lüfter-Nocken anlegbaren Lüfter-Hebel und einen hiermit drehfest verbundenen Betätigungs-Hebel aufweist. Es ist ein Kapsel-Lüfter-Antrieb vorgesehen, der einen Nocken mit einer Umfangs-Kurven-Fläche aufweist. Dieser Nocken wird von der Greifer-Antriebs-Welle über ein Untersetzungsgetriebe mit der halben Drehzahl wie der Greifer angetrieben. Der Betätigungs-Hebel liegt gegen die Umfangs-Kurven-Fläche an. Der konstruktive Aufwand dieser Ausgestaltung ist wegen der zwei Getriebe verhältnismäßig groß.From DE 100 25 851 C1, such a sewing machine is known, which has an arm, a base plate and a needle in the arm driven up and down driven for guiding a needle thread. It also has a mounted in a gripper bearing housing in the base plate, circumferentially drivable in a rotational direction by means of a vertical gripper drive shaft gripper and mounted in the base plate drivable transmission shaft. Further, a transmission gear arranged between the transmission shaft and the gripper drive shaft is provided for driving the gripper drive shaft at twice the speed of the transmission shaft. In the gripper a freely against this rotatably mounted bobbin case is arranged, which receives a coil, is provided with a fan cam and has a holding web which prevents rotation of the bobbin case in the direction of rotation with a relative to the base plate stationary retaining cam. Furthermore, a capsule fan is provided, which has an insertable against the fan cam fan lever and a non-rotatably connected actuating lever. There is provided a capsule fan drive having a cam with a circumferential cam surface. This cam is driven by the gripper drive shaft via a reduction gear at half the speed of the gripper. The actuation lever abuts against the circumferential curve surface. The design effort of this embodiment is relatively large because of the two gears.

Aus der DE-PS 872 148 ist eine Rückhaltevorrichtung für eine Spulenkapsel bekannt. Die Greifer-Antriebs-Welle eines um eine vertikale Achse drehbaren Greifer wird über ein Kegelrad-Getriebe von einer Übertragungs-Welle angetrieben, deren Antrieb wiederum vom Nähmaschinenantrieb abgeleitet wird. Auf der Übertragungs-Welle ist ein exzentrisch angeordneter Zylinder als Nocken angebracht, der über einen federbelasteten Hebel einen Lüfter-Hebel für die Spulenkapsel antreibt. Je nach Stellung des exzentrisch angeordneten Zylinders wird der Abtast-Hebel verschwenkt und gibt dann die Spulenkapsel frei oder hält sie.From DE-PS 872 148 a retaining device for a bobbin case is known. The gripper drive shaft of a rotatable about a vertical axis gripper is driven via a bevel gear by a transmission shaft, the drive in turn is derived from the sewing machine drive. On the transmission shaft, an eccentrically arranged cylinder is mounted as a cam, which drives a fan lever for the bobbin case via a spring-loaded lever. Depending on the position of the eccentrically arranged cylinder, the scanning lever is pivoted and then releases the bobbin case or holds it.

Der Erfindung liegt die Aufgabe zugrunde, eine Nähmaschine der gattungsgemäßen Art so auszugestalten, dass der Antrieb des Kapsellüfters mit besonders einfachen und zuverlässigen Mitteln arbeitet.The invention has for its object to design a sewing machine of the generic type so that the drive of the capsule fan works with particularly simple and reliable means.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst. Durch die direkte Ableitung des Kapsel-Lüfter-Antriebes von der Stirnseite der Übertragungs-Welle erfolgt ein Antrieb des Kapsel-Lüfters direkt mit der richtigen Drehzahl, nämlich der der Übertragungs-Welle, die nur halb so hoch ist, wie die Greifer-Drehzahl. Es wird dadurch eine sehr kompakte Bauweise ermöglicht. Andererseits ist es nicht erforderlich, dass der Greifer unmittelbar über dem Getriebe zwischen Greifer-Antriebs-Welle und Übertragungs-Welle angeordnet ist. Weiterhin ist die Zahl der Bauteile gering, was zu einer Reduktion der Herstellkosten führt. Die Masse der beweglichen Teile ist ebenfalls gering. Da nur ein Getriebe erforderlich ist, wird die Übertragung der Bewegung weitgehend spielfrei.This object is achieved by the features of claim 1. Due to the direct dissipation of the capsule fan drive from the front side of the transmission shaft is a drive of the capsule fan directly with the correct speed, namely the transmission shaft, which is only half as high as the gripper speed. It is made possible by a very compact design. On the other hand, it is not necessary that the gripper is arranged directly above the transmission between the gripper drive shaft and transmission shaft. Furthermore, the number of components is low, which leads to a reduction in manufacturing costs. The mass of moving parts is also low. Since only one transmission is required, the transmission of movement is largely free of play.

Weitere Vorteile ergeben sich aus den Unteransprüchen.Further advantages emerge from the subclaims.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigt

Fig. 1
eine Seiten-Längsansicht einer Doppel-Steppstich-Nähmaschine,
Fig. 2
eine Stirnansicht des Greiferlager-Gehäuses der Nähmaschine in einer Ansicht gemäß dem Sichtpfeil II in Fig. 1,
Fig. 3
eine Draufsicht auf das Greiferlager-Gehäuse mit Kapsel-Lüfter gemäß dem Sichtpfeil III in Fig. 1,
Fig. 4
eine Seitenansicht der Kurvenscheibe eines Kapsel-Lüfter-Antriebes entsprechend dem Sichtpfeil IV in Fig. 2 und
Fig. 5
den Verlauf einer Abwicklung der Kurven-Fläche der Kurven-Scheibe in einem Koordinatensystem.
An embodiment of the invention will be explained in more detail with reference to the drawing. It shows
Fig. 1
a side longitudinal view of a double lockstitch sewing machine,
Fig. 2
an end view of the gripper bearing housing of the sewing machine in a view according to the viewing arrow II in Fig. 1,
Fig. 3
a top view of the gripper bearing housing with capsule fan according to the viewing arrow III in Fig. 1,
Fig. 4
a side view of the cam of a capsule fan drive according to the viewing arrow IV in Fig. 2 and
Fig. 5
the course of a development of the curve surface of the cam disk in a coordinate system.

Die in Fig. 1 dargestellte Doppel-Steppstich-Nähmaschine weist in üblicher Weise einen oberen Arm 1, einen vertikalen Ständer 2 und eine untere gehäuseartige Grundplatte 3 auf. Im Arm 1 ist eine Armwelle 4 gelagert, über die eine Nadelstange 5 mit Nadel 6 auf- und abgehend antreibbar ist. Weiterhin wird von ihr ein Fadenhebel 7 angetrieben.The illustrated in Fig. 1 double lockstitch sewing machine has in a conventional manner an upper arm 1, a vertical stand 2 and a lower box-like base plate 3. In the arm 1, an arm shaft 4 is mounted, via which a needle bar 5 with needle 6 up and down driven. Furthermore, a thread lever 7 is driven by it.

In der Grundplatte 3 ist ein Vertikal-Greifer 8, das heißt ein um eine vertikale Achse 9 drehantreibbarer Doppel-Steppstich-Greifer 8, gelagert. Eine den Greifer 8 tragende Greifer-Antriebs-Welle 10, die um die Achse 9 antreibbar ist, ist in einem in der Grundplatte 3 angeordneten Greiferlager-Gehäuse 11 drehbar gelagert. Sie wird mittels einer Übertragungs-Welle 12 mittels eines Kegelrad-Getriebes 13 angetrieben. Die Übertragungswelle 12 wiederum wird mittels eines Zahnriementriebes 14 von der Armwelle 4 angetrieben. Der Zahnriementrieb 14 weist ein Übersetzungsverhältnis von 1:1 auf. Das Kegelrad-Getriebe 13 ist derart bemessen, dass ein Übersetzungsverhältnis von 1:2 realisiert ist. Dies bedeutet, dass sich der Greifer 8 zweimal dreht, wenn die Armwelle 4 beziehungsweise die Übertragungs-Welle 12 eine Umdrehung ausführt. Um dies zu realisieren, weist das an der Übertragungs-Welle 12 angebrachte große Antriebs-Kegelrad 15 die doppelte Zähnezahl auf wie das an der Greifer-Antriebs-Welle 10 angebrachte Abtriebs-Kegelrad 16.In the base plate 3, a vertical gripper 8, that is a about a vertical axis 9 rotatably driven double lockstitch gripper 8, stored. A gripper drive shaft 10 carrying the gripper 8, which can be driven about the axis 9, is rotatably mounted in a gripper bearing housing 11 arranged in the base plate 3. It is driven by means of a transmission shaft 12 by means of a bevel gear 13. The transmission wave 12 in turn is driven by a toothed belt drive 14 of the arm shaft 4. The toothed belt drive 14 has a transmission ratio of 1: 1. The bevel gear 13 is dimensioned such that a gear ratio of 1: 2 is realized. This means that the gripper 8 rotates twice when the arm shaft 4 and the transmission shaft 12 makes one revolution. To realize this, the large bevel gear 15 mounted on the transmission shaft 12 has twice the number of teeth as the driven bevel gear 16 mounted on the gripper drive shaft 10.

Oberhalb des Greifers 8 ist an der Oberseite der Grundplatte 3 eine Stichlochplatte 17 mit einem Stichloch 18 befestigt. Der topfförmig ausgebildete Greifer 8 weist eine Greiferspitze 19 auf, die unmittelbar an der durch das Stichloch 18 eingetauchten Nadel 6 vorbeiläuft und einen in dieser geführten Nadelfaden 20 ergreifen kann. Im Greifer 8 ist eine Spulenkapsel 21 gelagert, die um die Achse 9 gegenüber dem Greifer 8 frei drehbar ist. Die ebenfalls nach oben offene Spulenkapsel 21 weist einen radial zur Achse 9 nach außen und zur Stichlochplatte 17 nach oben vorspringenden Halte-Steg 22 auf, der zwischen zwei an der Unterseite der Stichlochplatte 17 ausgebildeten Halte-Nocken 23, 24 im Wesentlichen undrehbar gehalten ist.Above the gripper 8, a tap hole plate 17 with a tap hole 18 is attached to the top of the base plate 3. The pot-shaped gripper 8 has a gripper tip 19, which passes directly to the immersed by the needle hole 18 needle 6 and can take a guided in this needle thread 20. In the gripper 8, a bobbin case 21 is mounted, which is freely rotatable about the axis 9 relative to the gripper 8. The also upwardly open bobbin case 21 has a radially to the axis 9 outwardly and the tap hole plate 17 upwardly projecting retaining web 22 which is held between two formed on the bottom of the tap hole plate 17 retaining cams 23, 24 substantially non-rotatable.

Wie insbesondere Fig. 2 entnehmbar ist, befindet sich zwischen dem ersten Halte-Nocken 23 und dem Halte-Steg 22 ein erster seitlicher Luftspalt 25, zwischen dem Halte-Steg 22 und der Stichlochplatte 17 ein oberer Luftspalt 26 und zwischen dem Halte-Steg 22 und dem zweiten Halte-Nocken 24 ein zweiter seitlicher Luftspalt 27. Die Luftspalte 25, 26, 27 bilden bei der in Fig. 2 dargestellten Mittelstellung des Halte-Stegs 22 einen durchgehenden Kanal.As can be seen in particular from FIG. 2, a first lateral air gap 25 is located between the first retaining cam 23 and the retaining web 22, an upper air gap 26 is located between the retaining web 22 and the needle hole plate 17 and between the retaining web 22 and the second retaining cam 24, a second lateral air gap 27. The air gaps 25, 26, 27 form in the middle position of the holding web 22 shown in FIG. 2, a continuous channel.

In der Spulenkapsel 21 ist eine einen Spulenfaden 28 aufnehmende Spule 29 angeordnet, die mittels eines lösbaren Verriegelungs-Hebels 30 in der Spulenkapsel 21 gehalten wird. Die Spulenkapsel 21 weist an ihrem oberen Rand einen im Wesentlichen radial zur Achse 9 nach außen vorspringenden Lüfter-Nocken 31 auf, der mit einem Lüfter-Hebel 32 zusammenwirkt. Der Lüfter-Hebel 32 bildet einen Arm eines Kapsel-Lüfters 33. Der Kapsel-Lüfter 33 weist eine Lüfter-Welle 34 auf, die im Greiferlager-Gehäuse 11 um eine zur Achse 9 parallele vertikale Achse 35 in einem Lager 36 drehbar beziehungsweise schwenkbar gelagert ist. Ihre axiale Lage gegenüber dem Greiferlager-Gehäuse 11 wird durch einen Stellring 37 eingestellt und fixiert.In the bobbin case 21, a bobbin thread 28 receiving coil 29 is arranged, which is held in the bobbin case 21 by means of a releasable locking lever 30. The bobbin case 21 has at its upper edge on a substantially radially to the axis 9 outwardly projecting fan cam 31, which cooperates with a fan lever 32. The fan lever 32 forms an arm of a capsule fan 33. The capsule fan 33 has a fan shaft 34 which rotatably or pivotally mounted in the gripper bearing housing 11 about a vertical axis 35 parallel to the axis 9 in a bearing 36 is. Its axial position relative to the gripper bearing housing 11 is adjusted by a collar 37 and fixed.

Die Lüfter-Welle 34 ist Teil eines Kapsel-Lüfter-Antriebs 38. Hierzu gehört eine stirnseitig vor dem Antriebs-Kegelrad 15 auf der Welle 12 mittels einer Setzschraube 39' einstellbar angebrachte Axial-Kurvenscheibe 39 und ein gegen diese anliegender, drehfest mit der Lüfter-Welle 34 verbundener Abtast-Hebel 40. Der als Bolzen ausgebildete Abtast-Hebel 40 ist quer in die Lüfter-Welle 34 eingesteckt und mittels einer in der Welle 34 angeordneten Klemm-Schraube 41 einstellbar festgelegt. Mit seinem freien Ende liegt er gegen die stirnseitige Kurven-Fläche 42 der Axial-Kurvenscheibe 39 an.The fan shaft 34 is part of a capsule fan drive 38. This includes a front side of the drive bevel gear 15 on the shaft 12 by means of a set screw 39 'adjustably mounted axial cam 39 and an abutting against this, rotatably with the fan -Welle 34 connected sensing lever 40. The trained as a bolt scanning lever 40 is inserted transversely into the fan shaft 34 and set adjustable by means of a arranged in the shaft 34 clamping screw 41. With its free end, it bears against the end-face cam surface 42 of the axial cam 39.

Der Abtast-Hebel 40 wird mittels einer vorgespannten SchraubenDruckfeder 43 gegen die Kurven-Fläche 42 gedrückt. Hierzu liegt diese Druckfeder 43 einerseits gegen den Abtast-Hebel 40 und andererseits gegen eine Einstell-Schraube 44 an, die im Greiferlager-Gehäuse 41 angebracht ist. Mittels dieser Schraube 44 kann die Vorspannung der Druckfeder 43 und damit die Kraft eingestellt werden, mittels derer der Abtast-Hebel 40 gegen die Kurven-Fläche 42 anliegt.The sensing lever 40 is pressed against the cam surface 42 by means of a biassed compression coil spring 43. For this purpose, this compression spring 43 is on the one hand against the sensing lever 40 and on the other hand against a setting screw 44 which is mounted in the gripper bearing housing 41. By means of this screw 44, the bias of the compression spring 43 and thus the force can be adjusted by means of which the scanning lever 40 abuts against the cam surface 42.

Der Lüfter-Hebel 32 ist mittels einer Schraubverbindung 45 mit der Lüfter-Welle 34 verbunden, so dass eine exakte Einstellung des Kapsel-Lüfters 33 relativ zum Lüfter-Nocken 31 möglich ist. Wie sich aus den Fig. 2, 3 und 4 insgesamt ergibt, drückt die Druckfeder 43 den Lüfter-Hebel 32 in Richtung auf den Lüfter-Nocken 31, selbstverständlich jeweils nur soweit, wie es die Kurven-Fläche 42 in ihrer jeweiligen Drehstellung zulässt.The fan lever 32 is connected by means of a screw 45 with the fan shaft 34, so that an exact adjustment of the capsule fan 33 relative to the fan cam 31 is possible. As is apparent from Figs. 2, 3 and 4 overall, the compression spring 43 presses the fan lever 32 in the direction of the fan cam 31, of course, only as far as it allows the cam surface 42 in their respective rotational position.

Wie aus Fig. 5 hervorgeht, ist die Kurven-Fläche 42 derartig gebogen, dass der Abtast-Hebel 40 und damit der Lüfter-Hebel 32 bei einer Drehung der Kurvenscheibe 39 eine harmonische Bewegung ausführen. Am - in Fig. 4 oben dargestellten - höchsten Punkt der Kurven-Fläche 42 wird der in Fig. 5 erkennbare Maximal-Hub 46 der Kurven-Fläche 42 erreicht. In diesem Bereich ist der Lüfter-Hebel 32 am weitesten vom Lüfter-Nocken 31 entfernt. Im - in Fig. 4 unten dargestellten - niedrigsten Bereich der Kurven-Fläche 42 liegt der Minimal-Hub 47 der Kurven-Fläche 42 vor, wie in Fig. 5 ersichtlich ist, das heißt, in diesem Bereich liegt der Lüfter-Hebel 32 am Lüfter-Nocken 31 an und bewegt die Spulenkapsel 21 entgegen der Drehrichtung 48 des Greifers.As is apparent from Fig. 5, the cam surface 42 is bent such that the sensing lever 40 and thus the fan lever 32 perform a harmonic motion upon rotation of the cam 39. At the highest point of the cam surface 42 shown in FIG. 4 above, the maximum stroke 46 of the cam surface 42 which can be seen in FIG. 5 is reached. In this area, the fan lever 32 is farthest from the fan cam 31. In the lowest area of the cam surface 42 shown in FIG. 4 below, the minimum stroke 47 of the cam surface 42 is present, as can be seen in FIG. 5, that is to say the fan lever 32 is located in this area Fan cam 31 and moves the bobbin case 21 counter to the direction of rotation 48 of the gripper.

Wenn dagegen - wie bereits erwähnt - der Lüfter-Hebel 32 vom Lüfter-Nocken 31 abhebt, dreht sich die Spulenkapsel 21 aufgrund der Reibung zwischen Greifer 8 und Spulenkapsel 21 in Drehrichtung 48 mit, bis der Halte-Steg 22 am ersten Halte-Nocken 23 anliegt.If, however, - as already mentioned - the fan lever 32 lifts off the fan cam 31, the bobbin case 21 rotates due to the friction between the gripper 8 and bobbin case 21 in the direction of rotation 48 until the holding web 22 on the first holding cam 23rd is applied.

Die grundsätzliche Arbeitsweise ist wie bei Kapsel-Lüftern allgemein bekannt. Wenn der Lüfter-Hebel 32 nicht am Lüfter-Nocken 31 anliegt, dann liegt der Halte-Steg 22 der Spulenkapsel 21 aufgrund der Mitnahme der Spulenkapsel 21 durch den Greifer 8 in Drehrichtung 48 gegen den ersten Halte-Nocken 23 an. Der zweite seitliche Luftspalt 27 ist hierbei entgegen der Darstellung in Fig. 2 vergrößert, während der erste seitliche Luftspalt 25 geschlossen ist. Der Lüfter-Hebel 32 ist hierbei durch Anlage des Abtast-Hebels 40 im Bereich des Maximal-Hubs 46 der Kurven-Fläche 42 so weit verschwenkt, dass zwischen dem Lüfter-Nocken 31 und dem Lüfter-Hebel 32 ein Spalt 49 von 1 bis 1,5 mm Breite ausgebildet ist. In der zugeordneten Stellung des Greifers 8 und der Spulenkapsel 21 erfolgt die Aufnahme einer durch den Nadelfaden 20 gebildeten Fadenschlinge durch die Greiferspitze 19. Der Spulenfaden 28 ist über den Verriegelungshebel 30 zum Stichloch 18 geführt. Mit der Drehung des Greifers 8 führt die Axial-Kurvenscheibe 39 mit der Kurven-Fläche 42 eine Drehbewegung in der Drehrichtung 50 aus, wobei die Drehzahl der Axial-Kurvenscheibe 39 nur der Hälfte der Drehzahl des Greifers 8 entspricht.The basic procedure is well known as capsule fans. If the fan lever 32 is not applied to the fan cam 31, then is the holding web 22 of the bobbin case 21 due to the entrainment of the bobbin case 21 by the gripper 8 in the direction of rotation 48 against the first holding cam 23 at. The second lateral air gap 27 is in this case increased counter to the representation in Fig. 2, while the first lateral air gap 25 is closed. In this case, the fan lever 32 is pivoted so far by abutment of the scanning lever 40 in the region of the maximum stroke 46 of the curved surface 42 that a gap 49 between 1 and 1 between the fan cam 31 and the fan lever 32 , 5 mm wide is formed. In the assigned position of the gripper 8 and the bobbin case 21, the reception of a thread loop formed by the needle thread 20 takes place through the hook tip 19. The bobbin thread 28 is guided over the locking lever 30 to the stitch hole 18. With the rotation of the gripper 8, the axial cam 39 with the cam surface 42 performs a rotational movement in the direction of rotation 50, wherein the rotational speed of the axial cam 39 corresponds to only half the rotational speed of the gripper 8.

Mit der weiteren Drehung des Greifers 8 wird die Fadenschlinge um in soweit bekannter und üblicher Weise um die ortsfest gehaltene Spulenkapsel 21 herumgeführt. Kurz bevor die Fadenschlinge durch den Greifer 8 maximal aufgeweitet, also um die ortsfeste Spulenkapsel 19 herumgeführt worden ist, kommt der Abtast-Hebel 40 in den Bereich des Minimal-Hubes 47 der Kurven-Fläche 42. Damit wird eine Schwenkbewegung des Kapsel-Lüfters 33 entgegen der Drehrichtung 48 eingeleitet, und zwar durch die Kraft der Druckfeder 43. Hierbei erfolgt eine Verschwenkung der Spulenkapsel 21 entgegen der Drehrichtung 48. Der Halte-Steg 22 wird vom ersten Halte-Nocken 23 abgehoben. Hierbei wird der Halte-Steg 22 - entsprechend Fig. 2 - etwa in die Mitte zwischen die beiden Halte-Nocken 23 und 24 gebracht, so dass der erste seitliche Luftspalt 25, der obere Luftspalt 26 und der zweite seitliche Luftspalt 27 durchgehend offen sind. Die Nadelfadenschlinge kann ohne Widerstand durch den durch die Luftspalte 25, 26 , 27 gebildeten Kanal hindurchgleiten.With the further rotation of the gripper 8, the thread loop is guided around in a known and usual manner around the stationary held bobbin case 21. Shortly before the thread loop has been maximally widened by the gripper 8, that is to say it has been guided around the stationary bobbin case 19, the scanning lever 40 comes within the range of the minimum stroke 47 of the cam surface 42. This results in a pivot movement of the capsule fan 33 initiated by the force of the compression spring 43. In this case, a pivoting of the bobbin case 21 takes place counter to the direction of rotation 48. The holding web 22 is lifted from the first holding cam 23. Here, the holding web 22 - as shown in FIG. 2 - placed approximately in the middle between the two retaining cams 23 and 24, so that the first lateral air gap 25, the upper air gap 26 and the second lateral air gap 27 are continuously open. The needle thread loop can slide without resistance through the channel formed by the air gaps 25, 26, 27.

Mit der weiteren Drehbewegung des Greifers 8 wird die Nadelfadenschlinge freigegeben. Der Abtast-Hebel 40 wird durch Weiterdrehung der Kurven-Fläche 42 in Richtung auf deren Maximal-Hub 46 wieder zurückgeschwenkt; der Spalt 49 zwischen Lüfter-Hebel 32 und Lüfter-Nocken 31 wird wieder geöffnet, so dass die Fadenschlinge ohne Widerstand durch diesen Spalt 49 hindurchgleiten kann und zusammen mit dem Spulenfaden 28 einen Doppelsteppstich bildet.With the further rotational movement of the gripper 8, the needle thread loop is released. The scanning lever 40 is pivoted back by further rotation of the cam surface 42 in the direction of its maximum stroke 46; the gap 49 between the fan lever 32 and the fan cam 31 is opened again, so that the thread loop can slide through this gap 49 without resistance and together with the bobbin thread 28 forms a lockstitch.

Claims (7)

  1. A sewing machine, comprising
    - an arm (1);
    - a base plate (3);
    - a needle (6), which is mounted in the arm (1) drivably in up and down reciprocation, for guidance of a needle thread (20);
    - a hook (8), which is mounted in a hook-bearing case (11) in the base plate (3), rotatable by a vertical hook-driving shaft (10) in a direction of rotation (48);
    - a transmission shaft (12), which is drivably lodged in the base plate (3);
    - a step-up gear (13), which is disposed between the transmission shaft (12) and the hook-driving shaft (10), for actuation of the hook-driving shaft (10) at twice the speed of the transmission shaft (12);
    - a bobbin case (21) housed in the hook (8) freely rotatably in relation thereto, wherein the bobbin case (21)
    -- houses a bobbin (29),
    -- is provided with a lifter cam (31),
    -- hasa stopping rib (22) which cooperates with a stopping cam (23) that is stationary relative to the base plate (3), preventing the bobbin case (21) from rotating in the direction of rotation (48);
    - a case lifter (33),
    -- which comprises a lifter lever (32) that is applicable to the lifter cam (30),
    -- a sensing lever (40) loaded by a spring (43), and
    -- a lifter shaft (34), which is pivotably mounted in the hook-bearing case (11), non-rotatably joining to each other the lifter lever (31) and the sensing lever (40); and
    - a case-lifter drive mechanism (38),
    -- which comprises an axial cam disk (39),
    --- which is non-rotatably connected to the transmission shaft (12) and directly drivable thereby for rotation at a speed that is only half the speed of the hook (8), and
    --- which comprises a frontal cam face 42, against which is pressed the sensing lever (40).
  2. A sewing machine according to claim 1, characterized
    in that the sensing lever (40) is fixed to the lifter shaft (34) adjustably in length.
  3. A sewing machine according to claim 1, characterized
    in that the axial cam disk (39) is adjustably mounted on the transmission shaft (12).
  4. A sewing machine according to claim 1, characterized
    in that the gear acting between the hook-driving shaft (10) and the transmission shaft (12) is a step-up gear (13); and
    in that the axial cam disk (39) is fixed to the transmission shaft (12) in the step-up gear (13).
  5. A sewing machine according to claim 1, characterized
    in that the spring (43) loads the lifter lever (32) counter to the direction of rotation (48) of the hook (8).
  6. A sewing machine according to claim 1, characterized
    in that the lifter lever (32) and the sensing lever (40) are joined to each other for adjustment one relative to the other.
  7. A sewing machine according to claim 1, characterized
    in that the lifter lever (32) and the sensing lever (40) are joined to each other by a screwed connection (45).
EP03785896A 2002-12-28 2003-12-19 Sewing machine Expired - Lifetime EP1576224B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330549T SI1576224T1 (en) 2002-12-28 2003-12-19 Sewing machine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10261339 2002-12-28
DE10261339A DE10261339C1 (en) 2002-12-28 2002-12-28 Sewing machine looper has a bobbin capsule, with lifter cams, and a lifter mechanism with a lifter lever at the capsule lifter, and a feeler lever at the surface of an axial cam disk
PCT/EP2003/014626 WO2004059064A1 (en) 2002-12-28 2003-12-19 Sewing machine

Publications (2)

Publication Number Publication Date
EP1576224A1 EP1576224A1 (en) 2005-09-21
EP1576224B1 true EP1576224B1 (en) 2006-09-20

Family

ID=29225232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03785896A Expired - Lifetime EP1576224B1 (en) 2002-12-28 2003-12-19 Sewing machine

Country Status (10)

Country Link
US (1) US6923130B2 (en)
EP (1) EP1576224B1 (en)
JP (1) JP4395445B2 (en)
KR (1) KR101086999B1 (en)
CN (1) CN100543214C (en)
AT (1) ATE340281T1 (en)
AU (1) AU2003294920A1 (en)
DE (2) DE10261339C1 (en)
TW (1) TWI294935B (en)
WO (1) WO2004059064A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2050852A1 (en) 2007-10-20 2009-04-22 Dürkopp Adler Aktiengesellschaft Sewing machine and loop taker system for sewing machine
EP2050853A1 (en) 2007-10-20 2009-04-22 Dürkopp Adler Aktiengesellschaft Sewing machine and loop taker for sewing machine
DE102007050244A1 (en) 2007-10-20 2009-04-23 Dürkopp Adler AG Sewing machine and gripper system for sewing machine

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10261339C1 (en) 2002-12-28 2003-11-13 Duerkopp Adler Ag Sewing machine looper has a bobbin capsule, with lifter cams, and a lifter mechanism with a lifter lever at the capsule lifter, and a feeler lever at the surface of an axial cam disk
DE102009004217A1 (en) * 2009-01-09 2010-07-15 Dürkopp Adler AG Two-needle sewing machine
TWM366556U (en) 2009-03-16 2009-10-11 Chee Siang Ind Co Ltd Shuttle opening device of sewing machine
CN101845720B (en) * 2009-03-24 2012-10-24 启翔针车（上海）有限公司 Bobbin case opener of sewing machine
CN103966782B (en) * 2014-05-13 2015-08-26 诸暨市新信机电科技有限公司 Embroidery machine bottom line broken string auto-induction apparatus and autostop method
CN103952872B (en) * 2014-05-13 2015-07-08 诸暨市新信机电科技有限公司 Superhigh-speed embroidering machine
CN103966783B (en) * 2014-05-13 2015-08-26 诸暨市新信机电科技有限公司 Embroidery machine inner rotating-shuttle leaves shuttle device
CN111663250B (en) * 2020-06-16 2022-02-15 贵州师范大学 Handheld sewing machine with flying shuttle bobbin thread and motion mode thereof
CN114717760A (en) * 2021-01-05 2022-07-08 杰克科技股份有限公司 Rotating shuttle opening mechanism in sewing machine and sewing machine

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DE872148C (en) * 1945-04-18 1953-03-30 Mefina Sa Retaining device for the bobbin case
DE3244946C1 (en) * 1982-12-04 1984-04-26 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Free-running hook for lockstitch machines
DE3446548C1 (en) * 1984-12-20 1986-01-09 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Lockstitch sewing machine with a hook
DE10025851C1 (en) * 2000-05-25 2002-02-28 Duerkopp Adler Ag sewing machine
DE10025852A1 (en) 2000-05-25 2001-11-29 Gerd Papajewski Opening mechanism for the bobbin housing of a double lockstitch sewing machine has a moving limit stop with controlled movement speeds between the end positions and structured limit surfaces for a quiet and low-wear operation
JP2002143588A (en) * 2000-11-14 2002-05-21 Juki Corp Opener driving mechanism for horizontal shuttle
DE10261339C1 (en) 2002-12-28 2003-11-13 Duerkopp Adler Ag Sewing machine looper has a bobbin capsule, with lifter cams, and a lifter mechanism with a lifter lever at the capsule lifter, and a feeler lever at the surface of an axial cam disk

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2050852A1 (en) 2007-10-20 2009-04-22 Dürkopp Adler Aktiengesellschaft Sewing machine and loop taker system for sewing machine
EP2050853A1 (en) 2007-10-20 2009-04-22 Dürkopp Adler Aktiengesellschaft Sewing machine and loop taker for sewing machine
DE102007050244A1 (en) 2007-10-20 2009-04-23 Dürkopp Adler AG Sewing machine and gripper system for sewing machine
DE102007050245A1 (en) 2007-10-20 2009-04-23 Dürkopp Adler AG Sewing machine and gripper system for sewing machine
DE102007050243A1 (en) 2007-10-20 2009-04-23 Dürkopp Adler AG Sewing machine and gripper system for sewing machine

Also Published As

Publication number Publication date
DE50305144D1 (en) 2006-11-02
EP1576224A1 (en) 2005-09-21
AU2003294920A1 (en) 2004-07-22
JP4395445B2 (en) 2010-01-06
KR101086999B1 (en) 2011-11-29
CN1692194A (en) 2005-11-02
US20050039657A1 (en) 2005-02-24
ATE340281T1 (en) 2006-10-15
TWI294935B (en) 2008-03-21
CN100543214C (en) 2009-09-23
JP2006512121A (en) 2006-04-13
US6923130B2 (en) 2005-08-02
WO2004059064A1 (en) 2004-07-15
TW200422465A (en) 2004-11-01
DE10261339C1 (en) 2003-11-13
KR20050086367A (en) 2005-08-30

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