EP0451087A1 - Thread tension controlling device for sewing machine - Google Patents

Thread tension controlling device for sewing machine Download PDF

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Publication number
EP0451087A1
EP0451087A1 EP91810088A EP91810088A EP0451087A1 EP 0451087 A1 EP0451087 A1 EP 0451087A1 EP 91810088 A EP91810088 A EP 91810088A EP 91810088 A EP91810088 A EP 91810088A EP 0451087 A1 EP0451087 A1 EP 0451087A1
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EP
European Patent Office
Prior art keywords
thread
spring
lever
regulating device
take
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Granted
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EP91810088A
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German (de)
French (fr)
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EP0451087B1 (en
Inventor
Hanspeter Vogel
Niklaus Wacker
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Fritz Gegauf AG
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Fritz Gegauf AG
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Publication of EP0451087A1 publication Critical patent/EP0451087A1/en
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B49/00Take-up devices, e.g. levers, for the needle thread
    • D05B49/02Take-up devices, e.g. levers, for the needle thread operated by cams or linkages

Definitions

  • the present invention relates to a thread regulating device for sewing machines according to the preamble of patent claim 1.
  • thread regulating springs are inserted into the thread run, which compensate and also take on further tasks during the stitch formation process.
  • the thread regulating spring has different tasks. It must take up the upper thread, which becomes loose during the downward movement of the thread feeder, until the needle eye penetrates into the sewing material. As a result, the needle cannot pierce the loose thread, the thread cannot wind around the needle tip, and twisting of the thread before entering the eye of the needle is also prevented. Thread breaks or impairments of the seam are avoided. The thread regulating spring comes into action again shortly before the hook loosens the widened upper thread loop.
  • the thread regulating spring can also be used between the bobbin case finger and to pull off the upper thread loop slipping through the capsule-preventing retention means at the moment when the finger and the retention means are not in contact with one another. This results in a soft and low-noise thread take-off. Due to its function, the thread regulating spring may only exert a relatively weak tensile effect on the thread. However, it must act on the thread quickly and with as little loss as possible at the appropriate moment. Accordingly, the location, the design and the type of attachment of the spring are of considerable importance. The spring should also be arranged so that the operator does not have to pay particular attention to inserting the thread into the regulating spring when threading the machine.
  • a thread take-up element which keeps the thread under tension during a certain period of the stitch formation process under the action of a spring.
  • the thread take-up element is arranged near a position in which the thread-holding part of the thread take-up element is when the upper thread loop passes between the rotary stop for the bobbin case. With this arrangement, a uniform and low-noise thread take-off is effected by the hook. However, it is not possible to pick up the loose upper thread released by the thread feeder at the beginning of the needle downward movement and to prevent the formation of a loose thread section leading to the needle eye.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the problem of creating a particularly simple thread regulating device, optimally picks up the loose thread between the thread take-up lever and the needle eye or the hook in different phases of a stitch formation cycle.
  • the thread regulating spring can be connected in a simple manner to the thread-guiding part of the thread take-up device, by plugging it onto a pin arranged on the thread take-up device and securing it itself by appropriate shaping.
  • the thread guided by the thread take-up lever is securely tensioned at any time by the spring clip with reduced thread tension and / or held in the thread guide opening.
  • the lower sewing machine arm 3 and the upper arm 5 of the sewing machine 7 are placed on a base plate 1. Behind the upper machine arm 5, a spool of thread 11, which is attached to a spool of thread spool 13, is partially visible.
  • the machine has a schematically illustrated handwheel 15, a needle holder 17 and a needle 19 fastened in the needle holder 17.
  • two vertically running grooves 23 and 25 are visible, which are connected to one another below by a semicircular groove 27.
  • the groove 25 extends over the entire height of the upper sewing machine arm 5. Die Groove 23 is continued on the top 20 of the sewing arm 5 to the rear.
  • a conventionally designed thread tensioning device 29 is arranged and shown schematically.
  • the thread-guiding part 30 of a thread transmitter 31 oscillating in a vertical plane which is explained in more detail in the section according to FIG. 2, is visible.
  • the thread transmitter 31 which is designed, for example, as an articulated thread transmitter, is of a construction known per se and consists of a link 33 which on the one hand can be pivoted on a fixed axis 35 and whose second end is connected to the thread transmitter lever 36 by a joint 37.
  • the thread take-up lever 36 is also connected to a crank 39 by means of a joint 39.
  • the needle bar 45 is also articulated on the crank or crank disk 41 by means of a connecting rod 43.
  • the drive conditions for the joint thread transmitter 31 were selected such that the movement of the hook-shaped, thread-guiding part 30 runs completely within the sewing machine housing. Accordingly, a relatively sensitive thread regulating spring 47 is also arranged completely protected within the sewing machine housing.
  • the thread regulating spring 47 is fastened directly on the three-leg thread take-up lever 36 in the example, the front end of which comprises the thread-guiding part 30.
  • the thread regulating spring 47 preferably has a spring clip 49 which is U-shaped in plan and which surrounds the thread-guiding part 30 of the thread take-up lever 36 on both sides.
  • the thread regulating spring 47 which is made of thin spring wire, has at the fastening point on the thread take-up lever 36 a cylinder jacket-shaped winding package 51, which is pushed onto a pin 53 attached to the thread take-up lever 36.
  • One end 55 of the spring 47 in the area of the winding package 51 is led tangentially out of the cylindrical jacket-shaped part, bent twice and engages around the thread take-up lever 36.
  • the bent end 55 lies with its outermost portion on the thread take-up lever 36 and secures the spring 47 against rotation on the pin 53.
  • the spring clip 49 of the thread regulating spring 47 which is guided around the thread-guiding part 30, also has a cranked end 57 which engages in a cylindrical bore 48 in the axis of the pin 53 .
  • the thread regulating spring 47 is also bent downward in a V-shape and, together with the hook-shaped part 30, forms a guide opening 59 for one of the spool of thread 11 through the groove 23, via the thread tensioning device 29 and the groove 25 leading to the needle 19 upper thread 61.
  • a stop nose 63 and 65 is formed at the top and bottom, which limits the pivoting range of the spring clip 49 upwards and downwards.
  • the upper thread 61 is guided from the thread reel 11 sitting on the spool pin 13 of the machine on the upper side 20 via thread deflections (not shown) and through the thread tensioning device 29 to the thread dispenser 31.
  • the thread 61 When the thread 61 is inserted into the thread take-up lever 36, the thread first lies on the spring clip 49 of the thread regulating spring 47 and, as soon as the spring is tensioned, slides under the hook-shaped thread-guiding part 30 of the thread take-up lever 36, so that it is in the opening 59 in the loose state Thread regulating spring 47 and thread-guiding part 30 remains trapped and can no longer be unthreaded.
  • the thread-guiding needle 19 moves against a material 4 lying on the arm 3.
  • the thread take-up lever 36 simultaneously performs a faster downward movement than the needle bar 45 with the needle 19, so that loose thread is created between the thread take-up lever 36 and the eye of the needle , which is now taken up by the spring clip 49 of the thread regulating spring 47 so that the thread remains slightly tensioned in the region of the needle 19.
  • the spring clip 49 can only take up thread until it lies against the stop lug 63 of the thread take-up lever 36 and the thread comes into contact with the thread-guiding part 30 at point A. In the meantime, however, the needle eye has penetrated into the sewing material 4, so that the loose thread can no longer get caught on the needle tip or twist before entering the needle eye.
  • the looper in the lower arm 5 now grips the upper thread loop formed in a known manner, extends it and guides it around the lower thread supply in the bobbin case.
  • the loose upper thread between the thread take-up lever 36 and the material 4 is practically completely pulled off.
  • the thread feeder 36 also begins its upward movement, the spring clip 49 initially still storing the maximum possible thread quantity.

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

Abstract

The thread-regulating device for sewing machines having an articulated thread take-up system possesses a thread take-up lever (36), on which a thread-regulating spring (47) made of wire is attached directly. The thread-regulating spring (47) is U-shaped and surrounds the thread-guiding part (30) of the thread take-up lever (36). The upper thread running through the thread-guiding part (30) of the thread take-up lever (36) is deflected at the thread-regulating spring (47), and the thread-regulating spring (47) receives the loose thread and keeps it tensioned in specific phases of a stitch-forming operation. <IMAGE>

Description

Gegenstand der vorliegenden Erfindung ist eine Fadenreguliervorrichtung für Nähmaschinen gemäss Oberbegriff des Patentanspruches 1.The present invention relates to a thread regulating device for sewing machines according to the preamble of patent claim 1.

Der zum Oehr der Nadel führende Oberfaden muss beim Einstichvorgang, d.h. beim Absenken der Nadel auf und in das Nähgut der Bewegung der Nadel nachgeführt werden, damit keine kurzfristigen Zugspannungen auf den Faden wirken, welche den Stichbildevorgang beeinträchtigen. Es ist daher seit langem bekannt, oberhalb der Nadel einen oszillierenden Fadengeberhebel anzuordnen, welcher im wesentlichen synchron mit der Nadel auf-und abbewegt wird derart, dass der dem Nadelöhr zugeführte Faden weder ruckartig angespannt wird, noch eine lose Schlaufe bildet, die sich um die Nadel winden kann.The upper thread leading to the ear of the needle must be when the needle is lowered onto and into the sewing material, the movement of the needle is adjusted so that there are no short-term tensile stresses on the thread that impair the stitch formation process. It has therefore been known for a long time to arrange an oscillating thread take-up lever above the needle, which is moved up and down essentially synchronously with the needle such that the thread fed to the eye of the needle is neither jerked tightly nor forms a loose loop around the needle Needle can wind.

Weil die bekannten Fadengeberhebel aber den Faden nicht in jedem Zeitpunkt eines Stichbildevorganges absolut exakt dem Nadelöhr nachführen können, werden Fadenregulierfedern in den Fadenlauf eingefügt, die einen Ausgleich bewirken und zudem weitere Aufgaben beim Stichbildevorgang übernehmen. Je nach Art des Greifersystemes hat die Fadenregulierfeder verschiedene Aufgaben. Sie muss den bei der Abwärtsbewegung des Fadengebers lose werdenden Oberfaden so lange aufnehmen, bis das Nadelöhr in das Nähgut eindringt. Dadurch kann die Nadel nicht in den losen Faden stechen, der Faden kann sich nicht um die Nadelspitze schlingen und die Verdrillung des Fadens vor dem Eintritt in das Nadelöhr wird ebenfalls verhindert. Fadenbrüche oder Beeinträchtigungen der Naht werden so vermieden.
Kurz bevor der Greifer die aufgeweitete Oberfadenschlinge abwirft, tritt die Fadenregulierfeder erneut in Aktion. Sie bewirkt ein weiches und ruckfreies Abziehen der Oberfadenschlinge, bevor der Fadengeber wirksam wird und den Faden mit erhöhter Geschwindigkeit nach oben und in das Nähgut einzieht.
Die Fadenregulierfeder kann aber auch dazu dienen, die zwischen dem Spulenkapselfinger und dem die Drehung der Kapsel verhindernden Rückhaltemittel durchschlüpfende Oberfadenschlinge genau in dem Moment abzuziehen, in welchem der Finger und das Rückhaltemittel nicht gegeneinander anliegen. Dadurch wird ein weicher und geräuscharmer Fadenabzug erzielt. Funktionsbedingt darf die Fadenregulierfeder nur eine verhältnismässig schwache Zugwirkung auf den Faden ausüben. Sie muss aber im geeigneten Moment schnell und möglichst verlustfrei auf den Faden einwirken. Dementsprechend sind die örtliche Anordnung, die Ausbildung und die Befestigungsart der Feder von erheblicher Bedeutung. Die Feder sollte ausserdem so angeordnet sein, dass die Bedienungsperson beim Einfädeln der Maschine nicht speziell auf das Einlegen des Fadens in die Regulierfeder achten muss.
However, because the known thread take-up levers cannot track the thread absolutely exactly at the eye of the needle at every point in time of a stitch formation process, thread regulating springs are inserted into the thread run, which compensate and also take on further tasks during the stitch formation process. Depending on the type of hook system, the thread regulating spring has different tasks. It must take up the upper thread, which becomes loose during the downward movement of the thread feeder, until the needle eye penetrates into the sewing material. As a result, the needle cannot pierce the loose thread, the thread cannot wind around the needle tip, and twisting of the thread before entering the eye of the needle is also prevented. Thread breaks or impairments of the seam are avoided.
The thread regulating spring comes into action again shortly before the hook loosens the widened upper thread loop. It causes the upper thread loop to be pulled off gently and smoothly before the thread take-up takes effect and pulls the thread up and into the material at an increased speed.
The thread regulating spring can also be used between the bobbin case finger and to pull off the upper thread loop slipping through the capsule-preventing retention means at the moment when the finger and the retention means are not in contact with one another. This results in a soft and low-noise thread take-off. Due to its function, the thread regulating spring may only exert a relatively weak tensile effect on the thread. However, it must act on the thread quickly and with as little loss as possible at the appropriate moment. Accordingly, the location, the design and the type of attachment of the spring are of considerable importance. The spring should also be arranged so that the operator does not have to pay particular attention to inserting the thread into the regulating spring when threading the machine.

Aus der US-PS 4,856,443 ist ein Fadenaufnahmeelement bekannt, welches den Faden während einer bestimmten Periode des Stichbildevorganges unter der Wirkung einer Feder gespannt hält. Das Fadenaufnahmeelement ist nahe einer Position angeordnet, in welcher sich der fadenhrende Teil des Fadenaufnahmeelementes befindet, wenn die Oberfadenschlinge zwischen dem Drehanschlag für die Spulenkapsel hindurchgeht. Mit dieser Anordnung wird ein gleichmässiger und geräuscharmer Fadenabzug vom Greifer bewirkt. Es ist aber nicht möglich, den zu Beginn der Nadel-Abwärtsbewegung vom Fadengeber freigegebenen losen Oberfaden aufzunehmen und die Bildung eines losen zum Nadelöhr führenden Fadenabschnittes zu verhindern.From US-PS 4,856,443 a thread take-up element is known which keeps the thread under tension during a certain period of the stitch formation process under the action of a spring. The thread take-up element is arranged near a position in which the thread-holding part of the thread take-up element is when the upper thread loop passes between the rotary stop for the bobbin case. With this arrangement, a uniform and low-noise thread take-off is effected by the hook. However, it is not possible to pick up the loose upper thread released by the thread feeder at the beginning of the needle downward movement and to prevent the formation of a loose thread section leading to the needle eye.

Aus der Schweizer Patentschrift 421,673 ist weiter eine Fädenreguliervorrichtung bekannt, welche eine den Faden auslenkende Fadenregulierfeder enthält. Diese Anordnung erfordert einen komplizierten Aufbau der Fadenspannungsvorrichtung und hat, bedingt durch den sich ändernden Umschlingungswinkel des Fadens am Federarm, eine ungleichmässige Federwirkung.From the Swiss patent specification 421,673 a thread regulating device is also known which contains a thread regulating spring deflecting the thread. This arrangement requires a complicated structure of the thread tensioning device and, due to the changing wrap angle of the thread on the spring arm, has an uneven spring effect.

Hier will die Erfindung Abhilfe schaffen.
Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, eine besonderes einfache Fadenreguliervorrichtung zu schaffen, die losen Faden zwischen dem Fadengeberhebel und dem Nadelöhr bzw. dem Greifer in verschiedenen Phasen eines Stichbildezyklus optimal aufnimmt.
The invention seeks to remedy this.
The invention, as characterized in the claims, solves the problem of creating a particularly simple thread regulating device, optimally picks up the loose thread between the thread take-up lever and the needle eye or the hook in different phases of a stitch formation cycle.

Durch die direkte Anordnung eines Federbügels auf dem osszillierenden Fadengeberhebel und die sich daraus ergebende zeitweilige Verwendung des Federbügels als Führung des Fadens auf dem Fadengeberhebel ergibt sich ein konstanter gleichbleibender Umschlingungswinkel und daher gleichbleibende Reibverhältnisse, unabhängig von der momentanen Lage des Fadengeberhebels bzw. der Nadel.The direct arrangement of a spring clip on the oscillating thread take-up lever and the resulting temporary use of the spring clip to guide the thread on the thread take-up lever results in a constant constant wrap angle and therefore constant friction conditions, regardless of the current position of the thread take-up lever or the needle.

Die Fadenregulierfeder kann auf einfache Weise mit dem fadeführenden Teil des Fadengebers verbunden werden, indem sie auf einen am Fadengeber angeordneten Zapfen aufgesteckt wird und durch entsprechende Formgebung sich selbst sichert.The thread regulating spring can be connected in a simple manner to the thread-guiding part of the thread take-up device, by plugging it onto a pin arranged on the thread take-up device and securing it itself by appropriate shaping.

Der durch den Fadengeberhebel geführte Faden wird durch den Federbügel bei veminderter Fadenspannung jederzeit sicher gespannt und/oder in der Fadenführungsöffnung gefangen gehalten.The thread guided by the thread take-up lever is securely tensioned at any time by the spring clip with reduced thread tension and / or held in the thread guide opening.

Anhand eines illustrierten Ausführungsbeispieles wird die Erfindung näher erläutert. Es zeigen:

  • Figur 1 eine Seitenansicht einer Nähmaschine,
  • Figur 2 einen Querschnitt längs Linie II-II in Figur 1 und
  • Figur 3 einen Grundriss der Regulierfeder.
The invention is explained in more detail with the aid of an illustrated embodiment. Show it:
  • FIG. 1 shows a side view of a sewing machine,
  • Figure 2 shows a cross section along line II-II in Figure 1 and
  • Figure 3 is a plan view of the regulating spring.

Auf eine Grundplatte 1 ist der untere Nähmaschinenarm 3 und der obere Arm 5 der Nähmaschine 7 aufgesetzt. Hinter dem oberen Maschinenarm 5 ist eine Garnrolle 11, welche auf einem Garnrollenstift 13 aufgesteckt ist, teilweise sichtbar. Die Maschine weist ein schematisch dargestelltes Handrad 15, einen Nadelhalter 17 und eine im Nadelhalter 17 befestigte Nadel 19 auf. Im vorderen Teil 21 des oberen Nähmaschinenarmes 5 sind zwei vertikal verlaufende Nuten 23 und 25 sichtbar, welche unten durch eine halbkreisförmige Nut 27 miteinander verbunden sind. Die Nut 25 erstreckt sich über die gesamte Höhe des oberen Nähmaschinenarmes 5. Die Nut 23 findet ihre Fortsetzung auf der Oberseite 20 des Nähschinenarmes 5 bis zur Rückseite. Im Zentrum des bogenförmigen Abschnittes 27 zwischen den Nuten 23 und 25 ist eine herkömmlich ausgebildete Fadenspannungsvorrichtung 29 angeordnet und schematisch dargestellt. Innerhalb der Nut 25 ist der fadenführende Teil 30 eines in einer vertikal liegenden Ebene oszillierenden Fadengebers 31, welcher im Schnitt gemäss Figur 2 näher erläutert wird, sichtbar.The lower sewing machine arm 3 and the upper arm 5 of the sewing machine 7 are placed on a base plate 1. Behind the upper machine arm 5, a spool of thread 11, which is attached to a spool of thread spool 13, is partially visible. The machine has a schematically illustrated handwheel 15, a needle holder 17 and a needle 19 fastened in the needle holder 17. In the front part 21 of the upper sewing machine arm 5, two vertically running grooves 23 and 25 are visible, which are connected to one another below by a semicircular groove 27. The groove 25 extends over the entire height of the upper sewing machine arm 5. Die Groove 23 is continued on the top 20 of the sewing arm 5 to the rear. In the center of the arcuate section 27 between the grooves 23 and 25, a conventionally designed thread tensioning device 29 is arranged and shown schematically. Within the groove 25, the thread-guiding part 30 of a thread transmitter 31 oscillating in a vertical plane, which is explained in more detail in the section according to FIG. 2, is visible.

Der beispielsweise als Gelenkfadengeber ausgebildete Fadengeber 31 ist von an sich bekannter Bauweise und besteht aus einem Lenker 33, der einerseits auf einer festen Achse 35 schwenkbar ist, und dessen zweites Ende andererseits mit dem Fadengeberhebel 36 durch ein Gelenk 37 verbunden ist. Der Fadengeberhebel 36 ist zudem über ein Gelenk 39 mit einer Kurbel oder Kurbelscheibe 41 antriebsmässig verbunden. An der Kurbel oder Kurbelscheibe 41 ist mittels eines Pleuels 43 auch die Nadelstange 45 angelenkt.The thread transmitter 31, which is designed, for example, as an articulated thread transmitter, is of a construction known per se and consists of a link 33 which on the one hand can be pivoted on a fixed axis 35 and whose second end is connected to the thread transmitter lever 36 by a joint 37. The thread take-up lever 36 is also connected to a crank 39 by means of a joint 39. The needle bar 45 is also articulated on the crank or crank disk 41 by means of a connecting rod 43.

Im erfindungsgemässen Beispiel wurden die Antriebsverhältnisse für den Gelenkfadengeber 31 so gewählt, dass die Bewegung des hakenförmigen, fadenführenden Teiles 30 vollständig innerhalb des Nähmaschinengehäuses verläuft. Dementsprechend ist auch eine relativ empfindliche Fadenregulierfeder 47 vollständig innerhalb des Nähmaschinengehäuses geschützt angeordnet. Die Fadenregulierfeder 47 ist direkt auf dem im Beispiel dreischenkligen Fadengeberhebel 36 befestigt, dessen vorderes Ende den fadenführenden Teil 30 umfasst. Vorzugsweise weist die Fadenregulierfeder 47 einen im Grundriss U-förmig ausgebildeten Federbügel 49 auf, welcher den fadenführenden Teil 30 des Fadengebershebels 36 beidseitig umgibt.
Die Fadenregulierfeder 47, welche aus dünnem Federdraht hergestellt ist, weist an der Befestigungsstelle am Fadengeberhebel 36 ein zylindermantelförmiges Windungspaket 51 auf, das auf einem am Fadengeberhebel 36 angebrachten Zapfen 53 aufgeschoben ist. Das eine Ende 55 der Feder 47 im Bereich des Windungspaketes 51 ist tangential aus dem zylindermantelförmigen Teil herausgeführt, zweimal abgekröpft und umgreift den Fadengeberhebel 36. Das abgekröpfte Ende 55 liegt mit seinem äussersten Ab-schnitt am Fadengeberhebel 36 an und sichert die Feder 47 gegen eine Drehung auf den Zapfen 53. Der um den fadenführenden Teil 30 herumgeführte Federbügel 49 der Fadenregulierfeder 47 weist ebenfalls ein abgekröpftes Ende 57 auf, welches in eine zylindrische Bohrung 48 in der Achse des Zapfens 53 eingreift. Im Bereich des hakenförmigen fadenführenden Teils 30 des Fadengeberhebels 36 ist die Fadenregulierfeder 47 zudem V-förmig nach unten gebogen und bildet zusammen mit dem hakenförmigen Teil 30 eine Führungsöffnung 59 für einen von der Garnrolle 11 durch die Nut 23, über die Fadenspannungsvorrichtung 29 und die Nut 25 zur Nadel 19 führenden Oberfaden 61.
An der Vorderkante des fadenführenden Teils 30 ist oben und unten je eine Anschlagnase 63 bzw. 65 ausgebildet, welche den Schwenkbereich des Federbügels 49 nach oben und nach unten begrenzt. Bei vollständig nach unten ausgeschwenkter Regulierfeder 47 ergibt sich zwischen der Nase 67 des fadenführenden Teils 30 und der Feder 47 eine schlitzförmige Einführöffnung, durch die der Oberfaden 61 vor Beginn des Nähens eingelegt werden kann.
In the example according to the invention, the drive conditions for the joint thread transmitter 31 were selected such that the movement of the hook-shaped, thread-guiding part 30 runs completely within the sewing machine housing. Accordingly, a relatively sensitive thread regulating spring 47 is also arranged completely protected within the sewing machine housing. The thread regulating spring 47 is fastened directly on the three-leg thread take-up lever 36 in the example, the front end of which comprises the thread-guiding part 30. The thread regulating spring 47 preferably has a spring clip 49 which is U-shaped in plan and which surrounds the thread-guiding part 30 of the thread take-up lever 36 on both sides.
The thread regulating spring 47, which is made of thin spring wire, has at the fastening point on the thread take-up lever 36 a cylinder jacket-shaped winding package 51, which is pushed onto a pin 53 attached to the thread take-up lever 36. One end 55 of the spring 47 in the area of the winding package 51 is led tangentially out of the cylindrical jacket-shaped part, bent twice and engages around the thread take-up lever 36. The bent end 55 lies with its outermost portion on the thread take-up lever 36 and secures the spring 47 against rotation on the pin 53. The spring clip 49 of the thread regulating spring 47, which is guided around the thread-guiding part 30, also has a cranked end 57 which engages in a cylindrical bore 48 in the axis of the pin 53 . In the area of the hook-shaped thread-guiding part 30 of the thread take-up lever 36, the thread regulating spring 47 is also bent downward in a V-shape and, together with the hook-shaped part 30, forms a guide opening 59 for one of the spool of thread 11 through the groove 23, via the thread tensioning device 29 and the groove 25 leading to the needle 19 upper thread 61.
On the front edge of the thread-guiding part 30, a stop nose 63 and 65 is formed at the top and bottom, which limits the pivoting range of the spring clip 49 upwards and downwards. When the regulating spring 47 is pivoted completely downward, there is a slot-shaped insertion opening between the nose 67 of the thread-guiding part 30 and the spring 47, through which the upper thread 61 can be inserted before the sewing begins.

Der Oberfaden 61 wird von der auf dem Garnrollenstift 13 der Maschine sitzenden Garnrolle 11 auf der Oberseite 20 über nicht gezeichnete Fadenumlenkungen und durch die Fadenspannungsvorrichtung 29 hindurch zum Fadengeber 31 geführt. Beim Einlegen des Fadens 61 in den Fadengeberhebel 36 liegt der Faden zunächst auf dem Federbügel 49 der Fadenregulierfeder 47 und gleitet, sobald die Feder gespannt wird, unter den hakenförmigen fadenführenden Teil 30 des Fadengeberhebels 36, so dass er im losen Zustand in der Oeffnung 59 zwischen Fadenregulierfeder 47 und fadenführendem Teil 30 gefangen bleibt und nicht mehr ausfädeln kann.The upper thread 61 is guided from the thread reel 11 sitting on the spool pin 13 of the machine on the upper side 20 via thread deflections (not shown) and through the thread tensioning device 29 to the thread dispenser 31. When the thread 61 is inserted into the thread take-up lever 36, the thread first lies on the spring clip 49 of the thread regulating spring 47 and, as soon as the spring is tensioned, slides under the hook-shaped thread-guiding part 30 of the thread take-up lever 36, so that it is in the opening 59 in the loose state Thread regulating spring 47 and thread-guiding part 30 remains trapped and can no longer be unthreaded.

Zu Beginn des Stichbildevorganges bewegt sich die fadenführende Nadel 19 gegen ein auf dem Arm 3 liegendes Nähgut 4. Der Fadengeberhebel 36 führt gleichzeitig eine schnellere Abwärtsbewegung als die Nadelstange 45 mit der Nadel 19 aus, so dass zwischen dem Fadengeberhebel 36 und dem Nadelöhr loser Faden entsteht, welcher nun durch den Federbügel 49 der Fadenregulierfeder 47 aufgenommen wird, damit der Faden im Bereich der Nadel 19 leicht gespannt bleibt. Der Federbügel 49 kann nur Faden aufnehmen, bis er an der Anschlagnase 63 des Fadengeberhebels 36 anliegt und der Faden an der Stelle A in Kontakt mit dem fadenführenden Teil 30 gelangt. Inswischen ist aber das Nadelöhr in das Nähgut 4 eingedrungen, so dass sich der lose Faden nicht mehr an der Nadelspitze verfangen oder sich vor dem Eintritt in das Nadelöhr verdrillen kann. Der Greifer im unteren Arm 5 (nicht sichtbar) erfasst nun die in bekannter Weise gebildete Oberfadenschlinge, weitet sie aus und führt sie um den Unterfadenvorrat in der Spulenkapsel herum. Dabei wird der lose Oberfaden zwischen dem Fadengeberhebel 36 und dem Nähgut 4 praktisch vollständig abgezogen. Sobald der Greifer die aufgeweitete Oberfadenschlinge abgeworfen hat und die Fadenregulierfeder 47 den wieder lose werdenden Oberfaden durch eine Schwenkung im Gegenuhrzeigersinn nach oben aufnimmt, beginnt auch der Fadengeber 36 seine Aufwärtsbewegung, wobei der Federbügel 49 zunächst noch die maximal mögliche Fadenmenge speichert. Erst im oberen Bereich seiner Bewegungsbahn ist kein loser Faden zwischen dem Nähgut 4 und dem Fadengeberhebel 36 mehr vorhanden, so dass der Fadengeberhebel 36 den gebildeten Stich im Nähgut 4 festziehen kann und gleichzeitig auch ein neues Fadenstück von der Garnrolle 11 abzieht, um dieses für den nächsten Stichbildevorgang bereit zu halten. Beim Festziehen des Oberfadens liegt dieser an der Stelle A unten am fadenführenden Teil 30 des Fadengeberhebels 36 an (vgl. die in strichpunktierten Linien in Figur 2 angedeutete obere Stellung des Fadengeberhebels 36).At the beginning of the stitch formation process, the thread-guiding needle 19 moves against a material 4 lying on the arm 3. The thread take-up lever 36 simultaneously performs a faster downward movement than the needle bar 45 with the needle 19, so that loose thread is created between the thread take-up lever 36 and the eye of the needle , which is now taken up by the spring clip 49 of the thread regulating spring 47 so that the thread remains slightly tensioned in the region of the needle 19. The spring clip 49 can only take up thread until it lies against the stop lug 63 of the thread take-up lever 36 and the thread comes into contact with the thread-guiding part 30 at point A. In the meantime, however, the needle eye has penetrated into the sewing material 4, so that the loose thread can no longer get caught on the needle tip or twist before entering the needle eye. The looper in the lower arm 5 (not visible) now grips the upper thread loop formed in a known manner, extends it and guides it around the lower thread supply in the bobbin case. The loose upper thread between the thread take-up lever 36 and the material 4 is practically completely pulled off. As soon as the gripper has thrown off the widened upper thread loop and the thread regulating spring 47 picks up the loosening upper thread by swiveling it counterclockwise upwards, the thread feeder 36 also begins its upward movement, the spring clip 49 initially still storing the maximum possible thread quantity. Only in the upper area of its movement path is there no longer any loose thread between the sewing material 4 and the thread take-up lever 36, so that the thread take-up lever 36 can tighten the stitch formed in the sewing material 4 and at the same time also pulls a new piece of thread from the thread spool 11 in order to do this for the to have the next stitch formation process ready. When the upper thread is tightened, it rests at point A at the bottom on the thread-guiding part 30 of the thread take-up lever 36 (cf. the upper position of the thread take-up lever 36 indicated in broken lines in FIG. 2).

Claims (10)

Fadenreguliervorrichtung für Nähmaschinen mit einem Gelenkfadengebersystem und einer im Fadenlauf zwischen der Fadenspannvorrichtung und dem Oehr der Nadel angeordneten, den Faden zeitweise gespannt haltenden Regulierfeder, dadurch gekennzeichnet, dass die Feder (47) direkt auf dem Fadengeberhebel (36) angeordnet ist.Thread regulating device for sewing machines with an articulated thread dispenser system and a regulating spring arranged in the thread run between the thread tensioning device and the ear of the needle and temporarily holding the thread tension, characterized in that the spring (47) is arranged directly on the thread dispenser lever (36). Fadenreguliervorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Befestigung der Feder (47) zusammen mit dem Fadengeberhebel (36) eine translatorische Bewegung ausführt.Thread regulating device according to claim 1, characterized in that the fastening of the spring (47) together with the thread take-up lever (36) carries out a translatory movement. Fadenreguliervorrichtung nach einein der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass am Fadengeberhebel (36) als Haltemittel für die Feder (47) ein zylindrischer Zapfen (53) angeordnet ist, auf dem die Feder (47) drehfest befestigt ist.Thread regulating device according to one of claims 1 or 2, characterized in that a cylindrical pin (53) is arranged on the thread take-up lever (36) as holding means for the spring (47), on which the spring (47) is fixed in a rotationally fixed manner. Fadenreguliervorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Feder (47) ein zylindrisches Windungspaket (51) aufweist, welches auf dem Zapfen (53) aufgeschoben festsitzt.Thread regulating device according to claim 3, characterized in that the spring (47) has a cylindrical winding package (51) which is pushed onto the pin (53). Fadenreguliervorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass vom Windungspaket (51) ein erster zweifach gekröpfter Drahtabschnitt (55) wegführt, welcher den Fadengeberhebel (36) umgreift.Thread regulating device according to claim 4, characterized in that a first double cranked wire section (55) leads away from the winding package (51) and engages around the thread take-up lever (36). Fadenreguliervorrichtung nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass vom Windungspaket (51) ein Federbügel (49) wegführt, der seitlich am fadenführenden Teil (30) des Fadengeberhebels (36) liegt und mit diesem eine geschlossene Fadenführungsöffnung (59) bildet.Thread regulating device according to one of claims 4 or 5, characterized in that a spring clip (49) leads away from the winding package (51) and lies laterally on the thread-guiding part (30) of the thread take-up lever (36) and forms a closed thread guide opening (59) with it. Fadenreguliervorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Federbügel (49) den fadenführenden Teil (30) U-förmig umschliesst.Thread regulating device according to claim 6, characterized in that the spring clip (49) surrounds the thread-guiding part (30) in a U-shape. Fadenreguliervorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das Ende (57) des Federbügel (49) abgekröpft und in einer Bohrung (48) im Zentrum des Zapfens (53) gehalten ist.Thread regulating device according to claim 7, characterized in that the end (57) of the spring clip (49) is bent and held in a bore (48) in the center of the pin (53). Fadenreguliervorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass am fadenführenden Teil (30) des Fadengeberhebels (31) durch eine hakenförmig angeordnete Nase (67) und den Federbügel (49) eine Führungsöffnung (59) für den Faden (61) gebildet wird.Thread regulating device according to one of claims 1 to 8, characterized in that a guide opening (59) for the thread (61) is formed on the thread-guiding part (30) of the thread take-up lever (31) by a hook-shaped nose (67) and the spring clip (49) becomes. Fadenreguliervorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass der Faden (61) durch den Federbügel (49) in der Federführungsöffnung (59) gefangen ist.Thread regulating device according to claim 9, characterized in that the thread (61) is caught by the spring clip (49) in the spring guide opening (59).
EP91810088A 1990-04-05 1991-02-07 Thread tension controlling device for sewing machine Expired - Lifetime EP0451087B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1153/90 1990-04-05
CH1153/90A CH681094A5 (en) 1990-04-05 1990-04-05

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EP0451087A1 true EP0451087A1 (en) 1991-10-09
EP0451087B1 EP0451087B1 (en) 1995-04-05

Family

ID=4203723

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EP91810088A Expired - Lifetime EP0451087B1 (en) 1990-04-05 1991-02-07 Thread tension controlling device for sewing machine

Country Status (5)

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US (1) US5131338A (en)
EP (1) EP0451087B1 (en)
JP (1) JPH0489273U (en)
CH (1) CH681094A5 (en)
DE (2) DE59105071D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1037018C (en) * 1994-02-08 1998-01-14 周鹤鸣 Five-lever thread pickup mechanism with adjustable thread feed for sewing machine
DE19617945C1 (en) * 1996-05-04 1997-09-11 Union Special Gmbh Thread control for a chain stitch sewing machine
US6047653A (en) * 1997-06-13 2000-04-11 Cash; David R. Sewing machine with a take-up lever moving up and down through one cycle per revolution of a rotary cylindrical hook base
JP4995447B2 (en) * 2005-08-16 2012-08-08 株式会社鈴木製作所 Flat stitch sewing machine
CN108589077A (en) * 2016-03-07 2018-09-28 王小凤 A kind of sewing machine of thread-off prevention line

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US4422395A (en) * 1982-03-12 1983-12-27 The Singer Company Thread handling arrangement with fiber carrying strip and cam
US4736698A (en) * 1986-01-21 1988-04-12 Brother Kogyo Kabushiki Kaisha Thread take-up device for a sewing machine

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US4422395A (en) * 1982-03-12 1983-12-27 The Singer Company Thread handling arrangement with fiber carrying strip and cam
US4736698A (en) * 1986-01-21 1988-04-12 Brother Kogyo Kabushiki Kaisha Thread take-up device for a sewing machine

Also Published As

Publication number Publication date
DE9101845U1 (en) 1991-05-08
DE59105071D1 (en) 1995-05-11
CH681094A5 (en) 1993-01-15
EP0451087B1 (en) 1995-04-05
JPH0489273U (en) 1992-08-04
US5131338A (en) 1992-07-21

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