EP2138623B1 - Looper for a double backstitch sewing machine - Google Patents

Looper for a double backstitch sewing machine Download PDF

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Publication number
EP2138623B1
EP2138623B1 EP09006987A EP09006987A EP2138623B1 EP 2138623 B1 EP2138623 B1 EP 2138623B1 EP 09006987 A EP09006987 A EP 09006987A EP 09006987 A EP09006987 A EP 09006987A EP 2138623 B1 EP2138623 B1 EP 2138623B1
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EP
European Patent Office
Prior art keywords
hook
bobbin
brake
gripper
spring
Prior art date
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Application number
EP09006987A
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German (de)
French (fr)
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EP2138623A1 (en
Inventor
Christoph Heckner
Jakob Harder
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Duerkopp Adler AG
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Duerkopp Adler AG
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Publication of EP2138623A1 publication Critical patent/EP2138623A1/en
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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
    • D05B57/26—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
    • 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

Definitions

  • the invention relates to a gripper for a double-lockstitch sewing machine with a cup-shaped gripper body with a in the gripper body about an axis rotatably mounted bobbin case, which has a bottom and concentric with the axis of a bearing pin.
  • the invention has the object of providing a gripper of the general category in a simple manner so that on the one hand uniform braking torques and thus a uniform looper thread tension and on the other hand large Ausschubwege the hook thread reel from the bobbin case are possible.
  • a substantially cylindrical coil spring is used as a brake and Ausschub spring, which engages in a corresponding recess in the hub of the hook thread coil.
  • the brake and Ausschub spring must not be mathematically exactly cylindrical; critical is that it has sufficient space in the recess of the looper thread bobbin. So it can also be slightly barrel-shaped or slightly conical. This spring can therefore be made relatively long, so that large discharge paths are possible.
  • the braking moments can be set very precisely with such a spring, so that a uniform hook thread withdrawal takes place.
  • Fig. 1 illustrated double lockstitch sewing machine has in a conventional manner an upper arm 1, a vertical stand 2 and a lower housing-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 1 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 shaft 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 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, that indicates the transmission shaft 12 mounted large drive bevel gear 15, the double the number of teeth as the mounted on the gripper drive shaft 10 output bevel gear 16th
  • a tap hole plate 17 with a tap hole 18 is attached to the top of the base plate 3.
  • the 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 bobbin case 21 abuts with a bearing collar 22 on a bearing ring 23 which is mounted on the cup-shaped gripper body 24 of the gripper 8.
  • the bobbin case 21 is mounted in the usual manner such that the needle thread 20 grasped by the hook tip 19 can be guided around the bobbin case 21.
  • the bobbin case 21 is also substantially cup-shaped like the Fig. 2 to 4 is removable. It has concentric with the central longitudinal axis 9 of the gripper drive shaft 10 and the gripper 8, which is also its own axis, a hollow bearing pin 25 which receives a looper thread spool 26. This has a hollow hub 27 and an upper flange 28 and a lower flange 29 in a known manner.
  • the coil 26 is provided after removal from the bobbin case 21 with a supply of looper thread 30 and then inserted into the bobbin case 21.
  • a ring-cylindrical recess 31 is formed, which is open to the bearing journal 25 inwardly.
  • this recess 31 designed as a cylindrical coil spring brake and Ausschub spring 32 is disposed in an annular groove 33 in the bottom 34th the bobbin case 21 is supported and centered by means of a collar 33a relative to the axis 9.
  • the hub 27 of the coil 26 it is supported against a stop 31 a from.
  • locking means 35 is a pivotally mounted in the hollow bearing pin 25 locking lever 36 which has two mutually offset by 90 ° abutment surfaces 37, 38.
  • abutment surfaces 37, 38 is associated with a bearing in a recess 39 of the bearing pin 25 in the direction of the axis 9 slidably mounted abutment 40 which is pressed by a prestressed helical compression spring 41 against one of the abutment surfaces 37 or 38 ,
  • the abutment surface 37 of the lever 36 abuts when it is pivoted about the axis 9 by about 90 °, so that the coil 26 against the force of the brake and Ausschub spring 32 to the bottom 34 of the bobbin 21st is postponed, how out Fig.
  • the recess 31 extends from the lower flange 29 in the direction of the upper flange 28 over about a quarter of the extension of the coil 26 in the direction of the axis 8.
  • the recess 31 may also be up to half of this axial extent take, in particular, when the gap between the lower flange 29 and bottom 34 is reduced.
  • the spool 26 in the region of its upper flange 28, namely on the hub 27, a so-called cam groove 42 which is necessary so that the spool 26 can be rotated in a winding machine for winding a rapier thread 30.
  • this driver groove 42 engages a driver of the winding machine to ensure a positive rotary drive.
  • the locking lever 36 during operation of the gripper 8 does not obstruct the smooth free circulation of the spool 26 at the respective overflow of the cam groove 42 is radially outwardly of the cam groove 42 between the locking lever 36 and the flange 28 of the coil 26th a sliding bearing 43 is formed.
  • the lever 36 and thus the coil 26 in the bobbin case 21 are thus the lever 36 and the upper flange 28 only in an annular surface area 44 of the flange 28 and formed as an increase of the lever 36 pressing surface 44a together, the always same pressing force is given by the compressed cylindrical brake and Ausschub spring 32.
  • the friction torque and thus the braking torque between the locking lever 36 and the looper thread bobbin 26 is therefore also constant over one revolution of the bobbin 26.
  • Fig. 3 and 5 it can be seen, extending outside the annular surface area 44 in a relatively dense sequence extending radially short to the outer edge 46 of the flange 28 elongated holes 47, which are distributed uniformly over the circumference. They extend to the hub 27, but not to the annular surface area 44 of the flange 28. These slots 47 allow a very accurate observation of the supply of looper thread 30. Furthermore, the mass and thus the moment of inertia of the coil 26 is reduced.
  • the in the 6 and 7 shown looper thread bobbin 26a has a groove 31b formed as an annular groove into which a brake and Ausschub spring 32a can engage, as in Fig. 8 is shown while in the Fig. 2 and 4 shown brake and Ausschub spring 32 has turns 48, which have the same diameter throughout, the brake and Ausschub spring 32a in the lowermost region one or two windings 48a of reduced diameter, so that they can be centered on the annular collar 33a Although the remaining turns 48 have an enlarged diameter, since the recess 31b due to their design as an annular groove opposite to the Fig. 2 and 4 having enlarged diameter.
  • the embodiment according to the 6 and 7 has the advantage that despite the annular recess 31b for the brake and Ausschub spring 32a, the full guide length of the looper thread bobbin 26a on the bearing pin 25 of the bobbin case 21 is maintained.
  • the sliding bearing 43 can be configured in such a manner that the annular surface portion 44b is formed as an elevation on the upper flange 28 of the looper thread bobbin 26a.
  • the pressing surface 44a may be formed on the lock lever 36, but this is not necessary.

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

Abstract

The gripper e.g. double-backstitch gripper (8), has a bobbin case (21) arranged in a cap-shaped gripping body (24) about an axis (9) and including a base (34) and a bearing pin (25). A gripper thread bobbin (26) is movably arranged on the pin in a direction of the axis, and includes flanges (28, 29) that are spaced apart from each other, where the flanges are connected to a hollow boss (27). A brake spring and an exhaust spring i.e. cylindrical helical spring, enclose the pin, and the case is reinforced at a region of the base, and the bobbin is reinforced in an opening (31) of the boss.

Description

Die Erfindung betrifft einen Greifer für eine Doppel-Steppstich-Nähmaschine mit einem topfförmigen Greifer-Körper mit einer in dem Greifer-Körper um eine Achse drehbar angeordneten Spulenkapsel, die einen Boden und konzentrisch zur Achse einen Lager-Zapfen aufweist.The invention relates to a gripper for a double-lockstitch sewing machine with a cup-shaped gripper body with a in the gripper body about an axis rotatably mounted bobbin case, which has a bottom and concentric with the axis of a bearing pin.

Bei einem derartigen, aus der DE 195 10 830 C2 (entsprechend JP Hei-8-59-489 ; KR 7521/1996 ; CH ZL 96 104 262.1 ) bekannten Greifer ist zwischen dem Boden der Spulenkapsel und einem benachbarten Flansch der Spule eine Brems- und Ausschub-Feder angeordnet. Diese ist kegelstumpfförmig ausgebildet, so dass sie bei in die Spulenkapsel eingesetzter Greiferfaden-Spule bis auf die Dicke der Windungen zusammengedrückt werden kann. Eine Optimierung von großem Ausschub-Weg für die Spule einerseits und gleichmäßigem auf die Spule während des Betriebs ausgeübten Bremsmoment ist hiermit nur sehr schwer möglich.In such, from the DE 195 10 830 C2 (corresponding JP Hei-8-59-489 ; KR 7521/1996 ; CH ZL 96 104 262.1 ) known gripper a brake and Ausschub spring is disposed between the bottom of the bobbin case and an adjacent flange of the coil. This is frusto-conical in shape, so that it can be compressed to the thickness of the turns when inserted into the bobbin case looper thread bobbin. An optimization of large Ausschub-way for the coil on the one hand and uniform applied to the coil during operation braking torque is hereby very difficult.

Der Erfindung liegt die Aufgabe zugrunde, einen Greifer der allgemeinen Gattung in einfacher Weise so auszugestalten, dass einerseits gleichmäßige Bremsmomente und damit eine gleichmäßige Greiferfaden-Spannung und andererseits große Ausschubwege der Greiferfaden-Spule aus der Spulenkapsel ermöglicht werden.The invention has the object of providing a gripper of the general category in a simple manner so that on the one hand uniform braking torques and thus a uniform looper thread tension and on the other hand large Ausschubwege the hook thread reel from the bobbin case are possible.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst. Der Kern der Erfindung liegt darin, dass eine im wesentlichen zylindrische Schraubenfeder als Brems- und Ausschub-Feder eingesetzt wird, die in eine entsprechende Ausnehmung in der Nabe der Greiferfaden-Spule eingreift. Wie vorstehend erwähnt muss die Brems- und Ausschub-Feder nicht mathematisch exakt zylindrisch ausgebildet sein; entscheidend ist, dass sie in der Ausnehmung der Greiferfaden-Spule ausreichend Platz hat. Sie kann also auch leicht tonnenförmig oder ganz leicht konisch ausgebildet sein. Diese Feder kann demzufolge verhältnismäßig lang ausgebildet werden, so dass große Ausschub-Wege möglich sind. Andererseits lassen sich die Brems-Momente mit einer derartigen Feder sehr genau einstellen, so dass ein gleichmäßiger Greiferfaden-Abzug stattfindet. Des Weiteren ist es grundsätzlich möglich, den Raum zwischen dem dem Boden der Spulenkapsel zugewandten Flansch der Spule und dem Boden noch zu einer Vergrößerung der Spule auszunutzen, da der Platz für die erwähnte Kegelstumpf-Feder nicht mehr benötigt wird.This object is achieved by the features of claim 1. The essence of the invention is that a substantially cylindrical coil spring is used as a brake and Ausschub spring, which engages in a corresponding recess in the hub of the hook thread coil. As mentioned above, the brake and Ausschub spring must not be mathematically exactly cylindrical; critical is that it has sufficient space in the recess of the looper thread bobbin. So it can also be slightly barrel-shaped or slightly conical. This spring can therefore be made relatively long, so that large discharge paths are possible. On the other hand, the braking moments can be set very precisely with such a spring, so that a uniform hook thread withdrawal takes place. Furthermore, it is in principle possible to exploit the space between the bottom of the bobbin case facing flange of the coil and the bottom nor to an enlargement of the coil, since the space for the mentioned truncated cone spring is no longer needed.

Weitere vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüche.Further advantageous embodiments will be apparent from the dependent claims.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispieles der Erfindung anhand der Zeichnung. Es zeigt

Fig. 1
eine Nähmaschine in teilweise aufgebrochener schematischer Seiten-Darstellung,
Fig. 2
einen Greifer nach der Erfindung mit eingesetzter betriebsberei- ter Greiferfaden-Spule gemäß der Schnittlinie II-II in Fig. 3,
Fig. 3
eine Draufsicht auf den Greifer nach Fig. 2,
Fig. 4
einen Greifer nach Fig. 2 mit ausgeschobener Greiferfaden- Spule gemäß der Schnittlinie IV-IV in Fig. 5,
Fig. 5
eine Draufsicht auf den Greifer nach Fig. 4,
Fig. 6
einen Längsschnitt durch eine abgewandelte Ausführungsform einer Greiferfaden-Spule,
Fig. 7
eine Draufsicht auf die Greiferfaden-Spule nach Fig. 6 und
Fig. 8
eine für die Greiferfaden-Spule nach Fig. 6 geeignete zylindri- sche Brems- und Ausschub-Feder.
Further features, advantages and details of the invention will become apparent from the following description of an embodiment of the invention with reference to the drawing. It shows
Fig. 1
a sewing machine in partially broken schematic side view,
Fig. 2
a gripper according to the invention with inserted operable looper thread bobbin according to the section line II-II in Fig. 3 .
Fig. 3
a plan view of the gripper to Fig. 2 .
Fig. 4
a gripper after Fig. 2 with ejected looper thread bobbin according to the section line IV-IV in Fig. 5 .
Fig. 5
a plan view of the gripper to Fig. 4 .
Fig. 6
a longitudinal section through a modified embodiment of a looper thread bobbin,
Fig. 7
a plan view of the looper thread bobbin after Fig. 6 and
Fig. 8
one for the looper thread reel Fig. 6 suitable cylindrical brake and extension spring.

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.In the Fig. 1 illustrated double lockstitch sewing machine has in a conventional manner an upper arm 1, a vertical stand 2 and a lower housing-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 1 drehbar gelagert. Sie wird mittels einer Übertragungs-Welle 12 mittels eines Kegelrad-Getriebes 13 angetrieben. Die Übertragungs-Welle 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 1 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 shaft 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 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, that indicates the transmission shaft 12 mounted large drive bevel gear 15, the double the number of teeth as the mounted on the gripper drive shaft 10 output bevel gear 16th

Oberhalb des Greifers 8 ist an der Oberseite der Grundplatte 3 eine Stichlochplatte 17 mit einem Stichloch 18 befestigt. Der 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 Spulenkapsel 21 liegt mit einem Lager-Ringbund 22 an einem Lager-Ring 23 an, der auf dem topfförmigen Greifer-Körper 24 des Greifers 8 angebracht ist. Die Spulenkapsel 21 ist in der üblichen Weise derart gelagert, dass der von der Greiferspitze 19 erfasste Nadelfaden 20 um die Spulenkapsel 21 herumgeführt werden kann.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 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 bobbin case 21 abuts with a bearing collar 22 on a bearing ring 23 which is mounted on the cup-shaped gripper body 24 of the gripper 8. The bobbin case 21 is mounted in the usual manner such that the needle thread 20 grasped by the hook tip 19 can be guided around the bobbin case 21.

Die Spulenkapsel 21 ist ebenfalls im Wesentlichen topfförmig ausgebildet wie den Fig. 2 bis 4 entnehmbar ist. Sie weist konzentrisch zur Mittel-Längs-Achse 9 der Greifer-Antriebs-Welle 10 und des Greifers 8, die auch ihre eigene Achse ist, einen hohlen Lager-Zapfen 25 auf, der eine Greiferfaden-Spule 26 aufnimmt. Diese weist in bekannter Weise eine hohle Nabe 27 und einen oberen Flansch 28 und einen unteren Flansch 29 auf. Die Spule 26 wird nach Entnahme aus der Spulenkapsel 21 mit einem Vorrat an Greiferfaden 30 versehen und dann in die Spulenkapsel 21 eingesetzt.The bobbin case 21 is also substantially cup-shaped like the Fig. 2 to 4 is removable. It has concentric with the central longitudinal axis 9 of the gripper drive shaft 10 and the gripper 8, which is also its own axis, a hollow bearing pin 25 which receives a looper thread spool 26. This has a hollow hub 27 and an upper flange 28 and a lower flange 29 in a known manner. The coil 26 is provided after removal from the bobbin case 21 with a supply of looper thread 30 and then inserted into the bobbin case 21.

In der Nabe 27 der Spule 26 ist eine ringzylindrische Ausnehmung 31 ausgebildet, die nach innen zum Lager-Zapfen 25 hin offen ist. In dieser Ausnehmung 31 ist eine als zylindrische Schraubenfeder ausgebildete Brems- und Ausschub-Feder 32 angeordnet, die in einer Ringnut 33 im Boden 34 der Spulenkapsel 21 abgestützt und mittels eines Ringbundes 33a gegenüber der Achse 9 zentriert ist. In der Nabe 27 der Spule 26 stützt sie sich gegen einen Anschlag 31 a ab.In the hub 27 of the coil 26, a ring-cylindrical recess 31 is formed, which is open to the bearing journal 25 inwardly. In this recess 31 designed as a cylindrical coil spring brake and Ausschub spring 32 is disposed in an annular groove 33 in the bottom 34th the bobbin case 21 is supported and centered by means of a collar 33a relative to the axis 9. In the hub 27 of the coil 26, it is supported against a stop 31 a from.

Als Verriegelungs-Einrichtung 35 dient ein in dem hohlen Lager-Zapfen 25 schwenkbar gelagerter Verriegelungs-Hebel 36, der zwei um 90° gegeneinander versetzte Anlage-Flächen 37, 38 aufweist. Diesen Anlage-Flächen 37, 38 ist ein in einer Ausnehmung 39 des Lager-Zapfens 25 in Richtung der Achse 9 verschiebbar gelagertes Widerlager 40 zugeordnet, das von einer vorgespannten Schrauben-Druck-Feder 41 gegen eine der Anlage-Flächen 37 oder 38 gedrückt wird. An dem Widerlager 40 liegt die Anlage-Fläche 37 des Hebels 36 an, wenn dieser gegenüber der Achse 9 um etwa 90° verschwenkt ist, so dass die Spule 26 gegen die Kraft der Brems- und Ausschub-Feder 32 zum Boden 34 der Spulenkapsel 21 hin verschoben ist, wie aus Fig. 2 hervorgeht. Die Anlage-Fläche 38 liegt gegen das Widerlager 40 an, wenn der Hebel 36 etwa in Richtung der Achse 9 verläuft, d. h. wenn die Verriegelungs-Einrichtung 35 gelöst ist, so dass die Spule 26 von der Brems- und Ausschub-Feder 32 aus der Spulenkapsel 21 herausgeschoben wird, wie es in Fig. 4 dargestellt ist. In dieser Position kann die Spule 26 von der Bedienungsperson aus der Spulenkapsel 21 herausgenommen werden. Wie ein Vergleich der Fig. 2 und 4 erkennen lässt, wird die Brems- und Ausschub-Feder 32 bei eingesetzter Spule 26 weitestgehend zusammengedrückt; nach dem Öffnen der Verriegelungs-Einrichtung 35 entspannt sie sich und schiebt die Spule 26 weitgehend nach oben aus der Spulenkapsel 21 heraus, so dass sie leicht ergriffen werden kann. Wie weiterhin aus den Fig. 2 und 4 erkennbar ist, erstreckt sich die Ausnehmung 31 vom unteren Flansch 29 in Richtung zum oberen Flansch 28 über etwa ein Viertel der Erstreckung der Spule 26 in Richtung der Achse 8. Die Ausnehmung 31 kann aber auch bis zur Hälfte dieser axialen Erstreckung einnehmen, und zwar insbesondere, wenn der Spalt zwischen unteren Flansch 29 und Boden 34 verkleinert wird.As locking means 35 is a pivotally mounted in the hollow bearing pin 25 locking lever 36 which has two mutually offset by 90 ° abutment surfaces 37, 38. These abutment surfaces 37, 38 is associated with a bearing in a recess 39 of the bearing pin 25 in the direction of the axis 9 slidably mounted abutment 40 which is pressed by a prestressed helical compression spring 41 against one of the abutment surfaces 37 or 38 , At the abutment 40, the abutment surface 37 of the lever 36 abuts when it is pivoted about the axis 9 by about 90 °, so that the coil 26 against the force of the brake and Ausschub spring 32 to the bottom 34 of the bobbin 21st is postponed, how out Fig. 2 evident. The abutment surface 38 abuts against the abutment 40 when the lever 36 extends approximately in the direction of the axis 9, that is, when the locking device 35 is released, so that the coil 26 of the brake and Ausschub spring 32 from the Bobbin case 21 is pushed out, as it is in Fig. 4 is shown. In this position, the coil 26 can be removed from the bobbin case 21 by the operator. Like a comparison of Fig. 2 and 4 can be seen, the brake and Ausschub spring 32 is largely compressed with inserted coil 26; after opening the locking device 35 it relaxes and pushes the coil 26 largely upwards out of the bobbin case 21 so that it can be easily grasped. As continues from the Fig. 2 and 4 can be seen, the recess 31 extends from the lower flange 29 in the direction of the upper flange 28 over about a quarter of the extension of the coil 26 in the direction of the axis 8. The recess 31 may also be up to half of this axial extent take, in particular, when the gap between the lower flange 29 and bottom 34 is reduced.

Wie aus den Fig. 2 bis 4 hervorgeht, weist die Spule 26 im Bereich ihres oberen Flansches 28, und zwar an der Nabe 27, eine sogenannte Mitnehmer-Nut 42 auf, die notwendig ist, damit die Spule 26 in einer Spul-Maschine zum Aufspulen eines Greiferfadens 30 drehangetrieben werden kann. In diese Mitnehmer-Nut 42 greift ein Mitnehmer der Spul-Maschine ein, um einen formschlüssigen Drehantrieb sicherzustellen.Like from the Fig. 2 to 4 As can be seen, the spool 26 in the region of its upper flange 28, namely on the hub 27, a so-called cam groove 42 which is necessary so that the spool 26 can be rotated in a winding machine for winding a rapier thread 30. In this driver groove 42 engages a driver of the winding machine to ensure a positive rotary drive.

Damit der Verriegelungs-Hebel 36 beim Betrieb des Greifers 8 nicht den gleichmäßigen freien Umlauf der Spule 26 beim jeweiligen Überlaufen der Mitnehmer-Nut 42 behindert, ist radial außerhalb der Mitnehmer-Nut 42 zwischen dem Verriegelungs-Hebel 36 und dem Flansch 28 der Spule 26 ein Gleit-Lager 43 ausgebildet. In verriegeltem Zustand des Hebels 36 und damit der Spule 26 in der Spulenkapsel 21 liegen somit der Hebel 36 und der obere Flansch 28 nur in einem Ringflächen-Bereich 44 des Flansches 28 und einer als Erhöhung des Hebels 36 ausgebildeten Andrückfläche 44a aneinander, wobei die stets gleiche Andrückkraft durch die zusammengedrückte zylindrische Brems- und Ausschub-Feder 32 gegeben ist. Das Reibmoment und damit das Bremsmoment zwischen dem Verriegelungs-Hebel 36 und der Greiferfaden-Spule 26 ist also auch über jeweils eine Umdrehung der Spule 26 konstant.Thus, the locking lever 36 during operation of the gripper 8 does not obstruct the smooth free circulation of the spool 26 at the respective overflow of the cam groove 42 is radially outwardly of the cam groove 42 between the locking lever 36 and the flange 28 of the coil 26th a sliding bearing 43 is formed. In the locked state of the lever 36 and thus the coil 26 in the bobbin case 21 are thus the lever 36 and the upper flange 28 only in an annular surface area 44 of the flange 28 and formed as an increase of the lever 36 pressing surface 44a together, the always same pressing force is given by the compressed cylindrical brake and Ausschub spring 32. The friction torque and thus the braking torque between the locking lever 36 and the looper thread bobbin 26 is therefore also constant over one revolution of the bobbin 26.

An das Gleit-Lager 43 schließt sich radial nach außen eine Einwölbung 45 im Hebel 36 an, die als Griffmulde dient. Zum Öffnen des VerriegelungsHebels 36 aus der abgewinkelten Position gemäß Fig. 2 in die geöffnete Position gemäß Fig. 4 kann die Bedienungsperson den Hebel 36 zwischen diesem und dem oberen Flansch 28 der Spule 26 ergreifen, ohne ein Werkzeug zu Hilfe nehmen zu müssen.At the sliding bearing 43 is followed radially outwardly a concavity 45 in the lever 36, which serves as a grip. To open the locking lever 36 from the angled position according to Fig. 2 in the open position according to Fig. 4 the operator can move the lever 36 between take this and the upper flange 28 of the coil 26 without having to take a tool to help.

Wie aus Fig. 3 und 5 ersichtlich ist, sind außerhalb des Ringflächenbereichs 44 in relativ dichter Folge sich radial kurz bis vor den Außenrand 46 des Flansches 28 erstreckende Langlöcher 47 ausgebildet, die gleichmäßig über den Umfang verteilt sind. Sie erstrecken sich bis an die Nabe 27, aber nicht bis zu dem Ringflächen-Bereich 44 des Flansches 28. Diese Langlöcher 47 erlauben eine sehr genaue Beobachtung des Vorrats an Greiferfaden 30. Des Weiteren wird die Masse und damit das Trägheitsmoment der Spule 26 reduziert.How out Fig. 3 and 5 it can be seen, extending outside the annular surface area 44 in a relatively dense sequence extending radially short to the outer edge 46 of the flange 28 elongated holes 47, which are distributed uniformly over the circumference. They extend to the hub 27, but not to the annular surface area 44 of the flange 28. These slots 47 allow a very accurate observation of the supply of looper thread 30. Furthermore, the mass and thus the moment of inertia of the coil 26 is reduced.

Die in den Fig. 6 und 7 dargestellte Greiferfaden-Spule 26a weist eine als Ringnut ausgebildete Ausnehmung 31b auf, in die eine Brems- und Ausschub-Feder 32a eingreifen kann, wie sie in Fig. 8 dargestellt ist, während die in den Fig. 2 und 4 dargestellte Brems- und Ausschub-Feder 32 Windungen 48 aufweist, die durchgehend gleichen Durchmesser aufweisen, weist die Brems- und Ausschub-Feder 32a im untersten Bereich eine oder zwei Windungen 48a reduzierten Durchmessers auf, so dass sie auch auf dem Ringbund 33a zentriert werden kann, obwohl die übrigen Windungen 48 einen vergrößerten Durchmesser aufweisen, da die Ausnehmung 31b aufgrund ihrer Ausgestaltung als Ringnut einen gegenüber den Fig. 2 und 4 vergrößerten Durchmesser aufweist. Die Ausgestaltung nach den Fig. 6 und 7 weist den Vorteil auf, dass trotz der ringförmigen Ausnehmung 31b für die Brems- und Ausschub-Feder 32a die volle Führungslänge der Greiferfaden-Spule 26a auf dem Lager-Zapfen 25 der Spulenkapsel 21 erhalten bleibt.The in the 6 and 7 shown looper thread bobbin 26a has a groove 31b formed as an annular groove into which a brake and Ausschub spring 32a can engage, as in Fig. 8 is shown while in the Fig. 2 and 4 shown brake and Ausschub spring 32 has turns 48, which have the same diameter throughout, the brake and Ausschub spring 32a in the lowermost region one or two windings 48a of reduced diameter, so that they can be centered on the annular collar 33a Although the remaining turns 48 have an enlarged diameter, since the recess 31b due to their design as an annular groove opposite to the Fig. 2 and 4 having enlarged diameter. The embodiment according to the 6 and 7 has the advantage that despite the annular recess 31b for the brake and Ausschub spring 32a, the full guide length of the looper thread bobbin 26a on the bearing pin 25 of the bobbin case 21 is maintained.

Wie aus den Fig. 6 und 7 weiterhin hervorgeht, kann das Gleit-Lager 43 auch in der Weise ausgestaltet sein, dass der Ringflächen-Bereich 44b als Erhöhung auf dem oberen Flansch 28 der Greiferfaden-Spule 26a ausgebildet wird. In diesem Fall kann die Andrückfläche 44a am Verriegelungs-Hebel 36 ausgebildet sein, was aber nicht notwendig ist.Like from the 6 and 7 Furthermore, it can be understood that the sliding bearing 43 can be configured in such a manner that the annular surface portion 44b is formed as an elevation on the upper flange 28 of the looper thread bobbin 26a. In this case, the pressing surface 44a may be formed on the lock lever 36, but this is not necessary.

Claims (8)

  1. Hook for a double-lockstitch sewing machine, the hook comprising
    - a cup-shaped hook body (24);
    - a bobbin case (21) which is mounted in the hook body (24) for rotation about an axis (9), the bobbin case (21) comprising
    -- a bottom (34) and
    -- a bearing pin (25) which is concentric with the axis (9);
    - a hook thread bobbin (26, 26a) which is arranged on the bearing pin (25) for displacement in the direction of the axis (9), the hook thread bobbin (26, 26a) comprising
    -- two flanges (28, 29) which are spaced from each other, and
    -- a hollow hub (27) which is guided on the bearing pin (25) and interconnects the flanges (28, 29); and
    - a brake and discharge spring (32, 32a) which
    -- is a substantially cylindrical helical spring;
    characterised in that the brake and discharge spring (32, 32a)
    -- surrounds the bearing pin (25); and
    -- is supported in the region of the bottom (34) of the bobbin case (21) on the one hand and
    -- in a recess (31, 31b) of the hub (27) of the hook thread bobbin (26, 26a) on the other hand.
  2. Hook according to claim 1, characterised in
    that the brake and discharge spring (32, 32a) is supported in an annular groove (33) in the bottom (34) of the bobbin case (21).
  3. Hook according to claim 1 or 2, characterised in
    that the brake and discharge spring (32, 32a) is centred relative to the bobbin case (21) by means of an annular collar (33a).
  4. Hook according to one of claims 1 to 3, characterised in
    that the brake and discharge spring (32, 32a) abuts a stop (31 a) in the recess (31, 31 b) of the hub (27) of the hook thread bobbin (26, 26a).
  5. Hook according to one of claims 1 to 4, characterised in
    that the recess (31, 31b) extends in the direction of the axis (9) across one quarter to one half of the hub (27).
  6. Hook according to one of claims 1 to 5, characterised in
    that the recess (31) is open towards the bearing pin (25) of the bobbin case (21).
  7. Hook according to one of claims 1 to 5, characterised in
    that the recess (31b) is an annular groove in the hub (27) of the hook thread bobbin (26a).
  8. Hook according to claim 3, characterised in
    that the brake and discharge spring (32) comprises at least one winding (48a) on one end, the winding (48a) being adapted to the annular collar (33a).
EP09006987A 2008-06-24 2009-05-26 Looper for a double backstitch sewing machine Active EP2138623B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008030001A DE102008030001A1 (en) 2008-06-24 2008-06-24 Gripper for a double lockstitch sewing machine

Publications (2)

Publication Number Publication Date
EP2138623A1 EP2138623A1 (en) 2009-12-30
EP2138623B1 true EP2138623B1 (en) 2011-03-02

Family

ID=41092098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09006987A Active EP2138623B1 (en) 2008-06-24 2009-05-26 Looper for a double backstitch sewing machine

Country Status (6)

Country Link
EP (1) EP2138623B1 (en)
JP (1) JP5286170B2 (en)
KR (1) KR101509775B1 (en)
CN (1) CN101613915B (en)
AT (1) ATE500370T1 (en)
DE (2) DE102008030001A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1400006B1 (en) * 2010-03-15 2013-05-09 Cracco PERFECTED CROCHET GROUP, PARTICULARLY FOR SEWING MACHINES.
CH704196A1 (en) * 2010-12-09 2012-06-15 Bernina Int Ag Locking device for a bobbin case.
KR20150130855A (en) * 2014-05-14 2015-11-24 윤영수 Shuttle device for sewing machine
KR102082514B1 (en) 2018-08-12 2020-04-23 양준호 Butt wrapping paper
JP2022023333A (en) * 2020-07-27 2022-02-08 株式会社ジャノメ Bobbin

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Publication number Priority date Publication date Assignee Title
DE2454121C3 (en) * 1973-12-04 1982-03-04 VEB Nähmaschinenwerk Wittenberge, DDR 2900 Wittenberge Circulating gripper for sewing machines
JPS5089558U (en) * 1973-12-19 1975-07-29
DE7540565U (en) * 1975-12-19 1976-05-06 Duerkoppwerke Gmbh, 4800 Bielefeld CONTROLLED BRAKE DEVICE FOR THE LOOP THREAD SPOOL OF A DOUBLE STEPSTITCH SEWING MACHINE
JPS6040206Y2 (en) * 1980-11-11 1985-12-03 ブラザー工業株式会社 Full-rotation hook of sewing machine
JPS58122579U (en) * 1982-02-12 1983-08-20 株式会社　佐文工業所 bobbin case for sewing machine
JPS59190188U (en) * 1983-06-02 1984-12-17 株式会社　廣瀬製作所 Bobbin idling prevention device for horizontal full-rotation hooks
JPS6050976U (en) * 1983-09-16 1985-04-10 アイシン精機株式会社 Bobbin slip prevention device for sewing machines
US4462324A (en) * 1983-11-07 1984-07-31 The Singer Company Bobbin and plunger assembly
JPH0213057U (en) * 1988-07-08 1990-01-26
JPH0344140Y2 (en) * 1988-12-07 1991-09-17
JPH02130575U (en) * 1989-04-07 1990-10-29
JPH0449071U (en) * 1990-08-31 1992-04-24
KR960007521B1 (en) 1993-05-07 1996-06-05 삼성종합화학 주식회사 Catalyst for dehydrogeneration of hydrocarbon
JPH0859489A (en) 1994-08-22 1996-03-05 Nippon Telegr & Teleph Corp <Ntt> Freezing damage inhibitor for frozen blood
DE19510830C2 (en) 1995-03-24 2001-11-22 Duerkopp Adler Ag Bobbin brake for the hook thread bobbin of a lockstitch sewing machine
ATE396293T1 (en) * 2003-12-10 2008-06-15 Bernina Int Ag LOCKING DEVICE FOR A BOTTOM THREAD BOBBIN
CN2816082Y (en) * 2005-08-06 2006-09-13 卢治德 Shuttle-core automatic ejecting device of sewing machine

Also Published As

Publication number Publication date
KR20100002132A (en) 2010-01-06
EP2138623A1 (en) 2009-12-30
DE102008030001A1 (en) 2009-12-31
CN101613915B (en) 2012-12-12
KR101509775B1 (en) 2015-04-06
CN101613915A (en) 2009-12-30
JP2010005396A (en) 2010-01-14
JP5286170B2 (en) 2013-09-11
ATE500370T1 (en) 2011-03-15
DE502009000410D1 (en) 2011-04-14

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