EP1576224A1 - Sewing machine - Google Patents

Sewing machine

Info

Publication number
EP1576224A1
EP1576224A1 EP03785896A EP03785896A EP1576224A1 EP 1576224 A1 EP1576224 A1 EP 1576224A1 EP 03785896 A EP03785896 A EP 03785896A EP 03785896 A EP03785896 A EP 03785896A EP 1576224 A1 EP1576224 A1 EP 1576224A1
Authority
EP
European Patent Office
Prior art keywords
fan
lever
gripper
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.)
Granted
Application number
EP03785896A
Other languages
German (de)
French (fr)
Other versions
EP1576224B1 (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
Original Assignee
Duerkopp Adler AG
Priority date (The priority date 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 date listed.)
Filing date
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

Links

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 is known from DE 100 25 851 Cl, which has an arm, a base plate and a needle which is driven and can be driven up and down in the arm for guiding a needle thread. It also has a gripper mounted in a gripper bearing housing in the base plate, which can be driven in one direction of rotation by means of a vertical gripper drive shaft, and a drivable transmission shaft mounted in the base plate. Furthermore, 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 bobbin case which is freely rotatable relative to the bobbin, which receives a bobbin, is provided with a fan cam and has a retaining web which, with a retaining cam which is stationary relative to the base plate, prevents the bobbin case from rotating in the direction of rotation.
  • a capsule fan is provided which has a fan lever which can be placed against the fan cam and an actuating lever connected to it in a rotationally fixed manner.
  • a capsule fan drive is provided which has a cam with a circumferential curve surface. This cam is driven by the gripper drive shaft via a reduction gear at half the speed of the gripper. The actuating lever lies against the circumferential curve surface.
  • 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 capsule fan drive is derived directly from the front of the transmission shaft, the capsule fan is driven directly at the correct speed, namely that of the transmission shaft, which is only half as high as the gripper speed. This enables a very compact design.
  • the gripper it is not necessary for the gripper to be arranged directly above the transmission between the gripper drive shaft and the transmission shaft. Furthermore, the number of components is small, which leads to a reduction in manufacturing costs. The mass of the moving parts is also low. Since only one gear is required, the transmission of the movement is largely free of play.
  • 1 is a side longitudinal view of a double lockstitch sewing machine
  • FIG. 2 shows an end view of the hook bearing housing of the sewing machine in a view according to arrow II in FIG. 1,
  • FIG. 3 shows a plan view of the gripper bearing housing with capsule fan according to the arrow III in FIG. 1,
  • Fig. 4 is a side view of the cam of a capsule fan drive according to the arrow IV in Fig. 2 and
  • the double lockstitch sewing machine shown in FIG. 1 has in the usual way an upper arm 1, a vertical stand 2 and a lower housing-like base plate 3.
  • An arm shaft 4 is mounted in arm 1, via which a needle bar 5 with needle 6 can be driven up and down. Furthermore, a thread lever 7 is driven by it.
  • a vertical gripper 8 that is to say a double lockstitch gripper 8 which can be driven in rotation about a vertical axis 9, is mounted in the base plate 3.
  • a gripper drive shaft 10 carrying the gripper 8 and 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 the arm shaft 4 by means of a toothed belt drive 14.
  • the toothed belt drive 14 has a transmission ratio of 1: 1.
  • the bevel gear 13 is dimensioned such that a transmission ratio of 1: 2 is realized. This means that the gripper 8 rotates twice when the arm shaft 4 or the transmission shaft 12 makes one revolution.
  • the large drive bevel gear 15 attached to the transmission shaft 12 has twice the number of teeth as the output bevel gear 16 attached to the gripper drive shaft 10.
  • a tap hole plate 17 with a tap hole 18 is fastened above the gripper 8 on the upper side of the base plate 3.
  • the cup-shaped gripper 8 has a gripper tip 19 which runs directly past the needle 6 immersed through the tap hole 18; and can take a needle thread 20 guided in it.
  • a spool capsule 21 is mounted in the gripper 8 and can be freely rotated about the axis 9 relative to the gripper 8.
  • the bobbin case 21, which is also open at the top, has a holding web 22 which projects radially outwards to the axis 9 and upward to the needle plate 17 and which is held essentially non-rotatably between two holding cams 23, 24 formed on the underside of the needle plate 17.
  • the air gaps 25, 26, 27 form a continuous channel in the middle position of the retaining web 22 shown in FIG. 2.
  • a bobbin 29 Arranged in the bobbin case 21 is a bobbin 29 which receives a bobbin thread 28 and which is held in the bobbin case 21 by means of a releasable locking lever 30.
  • the bobbin case 21 has a fan cam 31 which projects essentially radially outward to the axis 9 and 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 is rotatably or pivotably mounted in the gripper bearing housing 11 about a vertical axis 35 parallel to the axis 9 in a bearing 36 is. Their axial position in relation to the gripper bearing housing 11 is set and fixed by an adjusting ring 37.
  • the fan shaft 34 is part of a capsule fan drive 38.
  • This includes an axial cam 39, which is adjustable on the end face in front of the drive bevel gear 15 on the shaft 12 by means of a set screw 39 ', and a rotationally fixed one against it the scanning lever 40 connected to the fan shaft 34.
  • the scanning lever 40 which is designed as a bolt, is inserted transversely into the fan shaft 34 and is adjustably fixed by means of a clamping screw 41 arranged in the shaft 34. With its free end, it bears against the end face surface 42 of the axial cam plate 39.
  • the scanning lever 40 is pressed against the curved surface 42 by means of a prestressed helical compression spring 43.
  • this compression spring 43 rests on the one hand against the scanning lever 40 and on the other hand against an adjusting screw 44 which is attached in the gripper bearing housing 41.
  • this screw 44 By means of this screw 44, the pretension of the pressure 43 and thus the force are set by means of which the scanning lever 40 rests against the curved surface 42.
  • the fan lever 32 is connected to the fan shaft 34 by means of a screw connection 45, so that an exact setting 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 in each case only as far as the curve surface 42 permits in its respective rotational position.
  • the curve surface 42 is bent in such a way that the scanning lever 40 and thus the fan lever 32 execute a harmonious movement when the cam disk 39 rotates.
  • the maximum stroke 46 of the curve surface 42 which can be seen in FIG. 5 is reached.
  • the fan lever 32 is furthest away from the fan cam 31.
  • the minimum stroke 47 of the curve surface 42 as can be seen in FIG. 5, that is to say in this region the fan lever 32 lies on Fan cam 31 and moves the bobbin case 21 against the direction of rotation 48 of the gripper.
  • the fan lever 32 lifts off the fan cam 31, the bobbin case 21 rotates in the direction of rotation 48 due to the friction between the gripper 8 and the bobbin case 21 until the holding web 22 on the first holding cam 23 is applied.
  • the basic mode of operation is generally known, as with capsule fans. If the fan lever 32 is not in contact with 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. In contrast to the illustration in FIG. 2, the second lateral air gap 27 is enlarged, while the first lateral air gap 25 is closed. The fan lever 32 is in this case pivoted so far by the contact of the scanning lever 40 in the region of the maximum stroke 46 of the curved surface 42 that a gap 49 of 1 to 1 between the fan cam 31 and the fan lever 32 , 5 mm width is formed.
  • the thread loop is guided around the bobbin case 21, which is held in a known and customary manner.
  • the scanning lever 40 comes into the area of the minimum stroke 47 of the curved surface 42.
  • Fan 33 initiated against the direction of rotation 48, namely by the force of the compression spring 43.
  • the bobbin case 21 is pivoted counter to the direction of rotation 48.
  • the holding web 22 is lifted off the first holding cam 23.
  • the Needle The loop can slide through the channel formed by the air gaps 25, 26, 27 without resistance.
  • 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 fan cam 31 is opened again, so that the thread loop can slide through this gap 49 without resistance and forms a double lockstitch together with the bobbin thread 28.

Landscapes

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

Nähmaschinesewing machine
Die Erfindung betrifft eine Nähmaschine.The invention relates to a sewing machine.
Aus der DE 100 25 851 Cl 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. 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 Nähmaschinenan- trieb 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.Such a sewing machine is known from DE 100 25 851 Cl, which has an arm, a base plate and a needle which is driven and can be driven up and down in the arm for guiding a needle thread. It also has a gripper mounted in a gripper bearing housing in the base plate, which can be driven in one direction of rotation by means of a vertical gripper drive shaft, and a drivable transmission shaft mounted in the base plate. Furthermore, 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 there is arranged a bobbin case which is freely rotatable relative to the bobbin, which receives a bobbin, is provided with a fan cam and has a retaining web which, with a retaining cam which is stationary relative to the base plate, prevents the bobbin case from rotating in the direction of rotation. Furthermore, a capsule fan is provided which has a fan lever which can be placed against the fan cam and an actuating lever connected to it in a rotationally fixed manner. A capsule fan drive is provided which has a cam with a circumferential curve surface. This cam is driven by the gripper drive shaft via a reduction gear at half the speed of the gripper. The actuating lever lies against the circumferential curve surface. The design effort of this configuration is relatively large because of the two gears. From DE-PS 872 148 a retaining device for a bobbin case is known. The hook drive shaft of a hook rotatable about a vertical axis is driven by a transmission shaft via a bevel gear, the drive of which is in turn derived from the sewing machine drive. On the transmission shaft, an eccentrically arranged cylinder is attached 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 or holds the bobbin case.
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 erforder- lieh ist, wird die Übertragung der Bewegung weitgehend spielfrei.This object is achieved by the features of claim 1. Because the capsule fan drive is derived directly from the front of the transmission shaft, the capsule fan is driven directly at the correct speed, namely that of the transmission shaft, which is only half as high as the gripper speed. This enables a very compact design. On the other hand, it is not necessary for the gripper to be arranged directly above the transmission between the gripper drive shaft and the transmission shaft. Furthermore, the number of components is small, which leads to a reduction in manufacturing costs. The mass of the moving parts is also low. Since only one gear is required, the transmission of the movement is largely free of play.
Weitere Vorteile ergeben sich aus den Unteransprüchen. Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigtFurther advantages result from the subclaims. An embodiment of the invention is explained below with reference to the drawing. It shows
Fig. 1 eine Seiten-Längsansicht einer Doppel- Steppstich-Nähmaschine,1 is a side longitudinal view of a double lockstitch sewing machine,
Fig. 2 eine Stirnansicht des Greiferlager-Gehäuses der Nähmaschine in einer Ansicht gemäß dem Sichtpfeil II in Fig. 1,2 shows an end view of the hook bearing housing of the sewing machine in a view according to arrow II in FIG. 1,
Fig. 3 eine Draufsicht auf das Greiferlager-Gehäuse mit Kapsel-Lüfter ge- maß dem Sichtpfeil III in Fig. 1,3 shows a plan view of the gripper bearing housing with capsule fan according to the arrow III in FIG. 1,
Fig. 4 eine Seitenansicht der Kurvenscheibe eines Kapsel-Lüfter-Antriebes entsprechend dem Sichtpfeil IV in Fig. 2 undFig. 4 is a side view of the cam of a capsule fan drive according to the arrow IV in Fig. 2 and
Fig. 5 den Verlauf einer Abwicklung der Kurven-Fläche der Kurven- Scheibe in einem Koordinatensystem.5 shows the course of a development of the curve surface of the curve 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 ge- häuseartige 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 double lockstitch sewing machine shown in FIG. 1 has in the usual way an upper arm 1, a vertical stand 2 and a lower housing-like base plate 3. An arm shaft 4 is mounted in arm 1, via which a needle bar 5 with needle 6 can be driven up and down. Furthermore, a thread lever 7 is driven by it.
In der Grundplatte 3 ist ein Vertikal-Greifer 8, das heißt ein um eine verti- kale 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 1 1 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.A vertical gripper 8, that is to say a double lockstitch gripper 8 which can be driven in rotation about a vertical axis 9, is mounted in the base plate 3. A gripper drive shaft 10 carrying the gripper 8 and 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 the arm shaft 4 by means of a toothed belt drive 14. The toothed belt drive 14 has a transmission ratio of 1: 1. The bevel gear 13 is dimensioned such that a transmission ratio of 1: 2 is realized. This means that the gripper 8 rotates twice when the arm shaft 4 or the transmission shaft 12 makes one revolution. In order to achieve this, the large drive bevel gear 15 attached to the transmission shaft 12 has twice the number of teeth as the output bevel gear 16 attached to 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 geführ- ten 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.A tap hole plate 17 with a tap hole 18 is fastened above the gripper 8 on the upper side of the base plate 3. The cup-shaped gripper 8 has a gripper tip 19 which runs directly past the needle 6 immersed through the tap hole 18; and can take a needle thread 20 guided in it. A spool capsule 21 is mounted in the gripper 8 and can be freely rotated about the axis 9 relative to the gripper 8. The bobbin case 21, which is also open at the top, has a holding web 22 which projects radially outwards to the axis 9 and upward to the needle plate 17 and which is held essentially non-rotatably between two holding cams 23, 24 formed on the underside of the needle plate 17.
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. 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.As can be seen in particular in FIG. 2, there is a first lateral air gap 25 between the first holding cam 23 and the holding web 22, an upper air gap 26 between the holding web 22 and the tap hole plate 17 and between the holding web 22 and the second retaining cam 24 a second lateral air gap 27. The air gaps 25, 26, 27 form a continuous channel in the middle position of the retaining web 22 shown in FIG. 2. Arranged in the bobbin case 21 is a bobbin 29 which receives a bobbin thread 28 and which is held in the bobbin case 21 by means of a releasable locking lever 30. At its upper edge, the bobbin case 21 has a fan cam 31 which projects essentially radially outward to the axis 9 and 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 is rotatably or pivotably mounted in the gripper bearing housing 11 about a vertical axis 35 parallel to the axis 9 in a bearing 36 is. Their axial position in relation to the gripper bearing housing 11 is set and fixed by an adjusting ring 37.
Die Lüfter- Welle 34 ist Teil eines Kapsel-Lüfter- Antriebs 38. Hierzu ge- hört 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 an axial cam 39, which is adjustable on the end face in front of the drive bevel gear 15 on the shaft 12 by means of a set screw 39 ', and a rotationally fixed one against it the scanning lever 40 connected to the fan shaft 34. The scanning lever 40, which is designed as a bolt, is inserted transversely into the fan shaft 34 and is adjustably fixed by means of a clamping screw 41 arranged in the shaft 34. With its free end, it bears against the end face surface 42 of the axial cam plate 39.
Der Abtast-Hebel 40 wird mittels einer vorgespannten Schrauben- Druckfeder 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 Druckte- der 43 und damit die Kraft eingestellt werden, mittels derer der Abtast- Hebel 40 gegen die Kurven-Fläche 42 anliegt.The scanning lever 40 is pressed against the curved surface 42 by means of a prestressed helical compression spring 43. For this purpose, this compression spring 43 rests on the one hand against the scanning lever 40 and on the other hand against an adjusting screw 44 which is attached in the gripper bearing housing 41. By means of this screw 44, the pretension of the pressure 43 and thus the force are set by means of which the scanning lever 40 rests against the curved 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 to the fan shaft 34 by means of a screw connection 45, so that an exact setting of the capsule fan 33 relative to the fan cam 31 is possible. As can be seen from FIGS. 2, 3 and 4 as a whole, the compression spring 43 presses the fan lever 32 in the direction of the fan cam 31, of course in each case only as far as the curve surface 42 permits in its 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.5, the curve surface 42 is bent in such a way that the scanning lever 40 and thus the fan lever 32 execute a harmonious movement when the cam disk 39 rotates. At the highest point of the curve surface 42 shown in FIG. 4 above, the maximum stroke 46 of the curve surface 42 which can be seen in FIG. 5 is reached. In this area, the fan lever 32 is furthest away from the fan cam 31. In the lowest region of the curve surface 42 - shown below in FIG. 4 - there is the minimum stroke 47 of the curve surface 42, as can be seen in FIG. 5, that is to say in this region the fan lever 32 lies on Fan cam 31 and moves the bobbin case 21 against 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, on the other hand, as already mentioned, the fan lever 32 lifts off the fan cam 31, the bobbin case 21 rotates in the direction of rotation 48 due to the friction between the gripper 8 and the bobbin case 21 until the holding web 22 on the first holding cam 23 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 Luftspält 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 Auf- nähme 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 mode of operation is generally known, as with capsule fans. If the fan lever 32 is not in contact with 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. In contrast to the illustration in FIG. 2, the second lateral air gap 27 is enlarged, while the first lateral air gap 25 is closed. The fan lever 32 is in this case pivoted so far by the contact of the scanning lever 40 in the region of the maximum stroke 46 of the curved surface 42 that a gap 49 of 1 to 1 between the fan cam 31 and the fan lever 32 , 5 mm width is formed. In the assigned position of the hook 8 and the bobbin case 21, a thread loop formed by the needle thread 20 is picked up by the hook tip 19. The bobbin thread 28 is guided to the tap hole 18 via the locking lever 30. With the rotation of the gripper 8, the axial cam 39 with the cam surface 42 executes a rotational movement in the direction of rotation 50, the speed of the axial cam 39 corresponding to only half the 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 ma- ximal 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 Spulen- kapsei 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 Lu tspält 27 durchgehend offen sind. Die Nadelfa- denschlinge 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 the bobbin case 21, which is held in a known and customary manner. Shortly before the thread loop has been maximally widened by the gripper 8, that is to say it has been guided around the fixed bobbin case 19, the scanning lever 40 comes into the area of the minimum stroke 47 of the curved surface 42. Fan 33 initiated against the direction of rotation 48, namely by the force of the compression spring 43. Here, the bobbin case 21 is pivoted counter to the direction of rotation 48. The holding web 22 is lifted off the first holding cam 23. 2 - is brought approximately in the middle between the two holding 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 The loop can slide through the channel formed by the air gaps 25, 26, 27 without resistance.
Mit der weiteren Drehbewegung des Greifers 8 wird die Nadelfadenschlin- ge 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 rotary movement of the hook 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 fan cam 31 is opened again, so that the thread loop can slide through this gap 49 without resistance and forms a double lockstitch together with the bobbin thread 28.

Claims

Patentansprüche claims
1. Nähmaschine mit einem Arm (1), - mit einer Grundplatte (3), mit einer im Arm ( 1 ) auf- und abgehend antreibbar abgestützten Nadel (6) zur Führung eines Nadelfadens (20), mit einem in einem Greiferlager-Gehäuse (11) in der Grundplatte (3) gelagerten, umlaufend in einer Drehrichtung (48) mittels einer vertikalen Greifer- Antriebs- Welle (10) antreibbaren Greifer (8), mit einer in der Grundplatte (3) gelagerten antreibbaren Übertragungs-Welle (12) mit einem zwischen der Übertragungs- Welle (12) und der Greifer- Antriebs- Welle (10) angeordneten Übersetzungs-Getriebe (13) zum Antrieb der Greifer- Antriebs- Welle (10) mit der doppelten1. Sewing machine with one arm (1), - with a base plate (3), with a needle (6), which can be driven up and down in the arm (1) for driving a needle thread (20), with one in a hook bearing housing (11) mounted in the base plate (3), rotating in a direction of rotation (48) by means of a vertical gripper drive shaft (10) gripper (8), with a drivable transmission shaft (12.) Mounted in the base plate (3) ) with a transmission gear (13) arranged between the transmission shaft (12) and the gripper drive shaft (10) for driving the gripper drive shaft (10) with double
Drehzahl der Übertragungs- Welle (12). mit einer im Greifer (8) frei gegenüber diesem drehbar gelagerten Spulenkapsel (21), « die eine Spule (29) aufnimmt, — die mit einem Lüfter-Nocken (31) versehen ist,Speed of the transmission shaft (12). with a bobbin case (21) which is rotatably mounted in the gripper (8) and which holds a bobbin (29) and which is provided with a fan cam (31),
— die einen Halte-Steg (22) aufweist, der mit einem gegenüber der Grundplatte (3) ortsfesten Halte-Nocken (23) eine Drehung der Spulenkapsel (21) in der Drehrichtung (48) verhindert, mit einem Kapsel-Lüfter (33), der ~ einen gegen den Lüfter-Nocken (30) anlegbaren Lüfter-Hebel- Which has a retaining web (22) which prevents the bobbin case (21) from rotating in the direction of rotation (48) with a retaining cam (23) which is stationary relative to the base plate (3), with a capsule fan (33) , the ~ a fan lever that can be placed against the fan cam (30)
(32),(32)
- einen mittels einer Feder (43) belasteten Abtast-Hebel (40) und ~ eine den Lüfter-Hebel (31) und den Abtast-Hebel (40) drehfest miteinander verbindende, im Greiferlager-Gehäuse (11) schwenkbar gelagerte Lüfter- Welle (34) aufweist, und mit einem Kapsel-Lüfter- Antrieb (38), ~ der eine Axial-Kurvenscheibe (39) aufweist,- A scanning lever (40) loaded by a spring (43) and ~ has a fan shaft (34) which rotatably connects the fan lever (31) and the scanning lever (40) to one another and is pivotally mounted in the gripper bearing housing (11), and with a capsule fan drive (38), ~ which has an axial cam (39),
— die mit der Übertragungs- Welle (12) drehfest verbunden und von dieser mit einer gegenüber der Drehzahl des Greifers (8) nur halb so großen Drehzahl direkt drehantreibbar ist und — die eine stirnseitige Kurven-Fläche (42) aufweist, gegen die der Abtast-Hebel (40) angedrückt ist.- Which is connected to the transmission shaft (12) in a rotationally fixed manner and can be driven directly in rotation by the latter at a speed which is only half as large as the speed of the gripper (8) and - which has a frontal curve surface (42) against which the scanning -The lever (40) is pressed.
2. Nähmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Abtast-Hebel (40) längeneinstellbar an der Lüfter- Welle (34) befestigt ist.2. Sewing machine according to claim 1, characterized in that the scanning lever (40) is fixed in length on the fan shaft (34).
3. Nähmaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Axial-Kurvenscheibe (39) einstellbar an der Übertragungs- Welle (12) angebracht ist.3. Sewing machine according to claim 1, characterized in that the axial cam (39) is adjustably attached to the transmission shaft (12).
4. Nähmaschine nach Anspruch 1, dadurch gekennzeichnet, dass das Getriebe zwischen Greifer- Antriebs- Welle (10) und Übertragungs-Welle (12) als Kegelrad-Getriebe (13) ausgebildet ist und dass die Axial-Kurvenscheibe (39) im Kegelrad-Getriebe (13) auf der Übertragungs- Welle (12) befestigt ist.4. Sewing machine according to claim 1, characterized in that the gear between gripper drive shaft (10) and transmission shaft (12) is designed as a bevel gear (13) and that the axial cam (39) in the bevel gear Gear (13) is attached to the transmission shaft (12).
5. Nähmaschine nach Anspruch 1 , dadurch gekennzeichnet, dass die Feder (43) den Lüfter-Hebel (32) entgegen der Drehrichtung (48) des Greifers (8) belastet. 5. Sewing machine according to claim 1, characterized in that the spring (43) loads the fan lever (32) against the direction of rotation (48) of the hook (8).
6. Nähmaschine nach Ansprüche 1, dadurch gekennzeichnet, dass der Lüfter-Hebel (32) und der Abtast-Hebel (40) zueinander einstellbar miteinander verbunden sind.6. Sewing machine according to claims 1, characterized in that the fan lever (32) and the scanning lever (40) are connected to one another in an adjustable manner.
7. Nähmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Lüfter-Hebel (32) und der Abtast-Hebel (40) mittels einer Schraubverbindung (45) miteinander verbunden sind. 7. Sewing machine according to claim 1, characterized in that the fan lever (32) and the scanning lever (40) are connected to one another by means of a screw 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 true EP1576224A1 (en) 2005-09-21
EP1576224B1 EP1576224B1 (en) 2006-09-20

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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)

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Publication number Publication date
CN100543214C (en) 2009-09-23
JP4395445B2 (en) 2010-01-06
ATE340281T1 (en) 2006-10-15
EP1576224B1 (en) 2006-09-20
US20050039657A1 (en) 2005-02-24
KR101086999B1 (en) 2011-11-29
JP2006512121A (en) 2006-04-13
TW200422465A (en) 2004-11-01
TWI294935B (en) 2008-03-21
KR20050086367A (en) 2005-08-30
US6923130B2 (en) 2005-08-02
CN1692194A (en) 2005-11-02
DE10261339C1 (en) 2003-11-13
DE50305144D1 (en) 2006-11-02
AU2003294920A1 (en) 2004-07-22
WO2004059064A1 (en) 2004-07-15

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