EP1541736B1 - Locking device for lower thread bobbin - Google Patents

Locking device for lower thread bobbin Download PDF

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Publication number
EP1541736B1
EP1541736B1 EP04405582A EP04405582A EP1541736B1 EP 1541736 B1 EP1541736 B1 EP 1541736B1 EP 04405582 A EP04405582 A EP 04405582A EP 04405582 A EP04405582 A EP 04405582A EP 1541736 B1 EP1541736 B1 EP 1541736B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
locking element
locking device
coil
foot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04405582A
Other languages
German (de)
French (fr)
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EP1541736A3 (en
EP1541736A2 (en
Inventor
Hans Flückiger
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.)
BERNINA International AG
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BERNINA International AG
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Filing date
Publication date
Application filed by BERNINA International AG filed Critical BERNINA International AG
Publication of EP1541736A2 publication Critical patent/EP1541736A2/en
Publication of EP1541736A3 publication Critical patent/EP1541736A3/en
Application granted granted Critical
Publication of EP1541736B1 publication Critical patent/EP1541736B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a locking device for a bobbin according to the preamble of patent claim 1.
  • the bobbin of sewing machines can either be stored directly in the bobbin and is thus directly accessible or it can be inserted in a specially designed bobbin case, which in turn is mounted in the bobbin.
  • the present invention relates to a bobbin mounted directly in the bobbin; However, it can also be used for a coil mounted indirectly in a bobbin case.
  • a bobbin case for rotary gripper is known in which the coil on a cylindrical spool, which is part of the bobbin case, pushed and held by a safety lever.
  • the safety lever designed as a two-armed lever, is in the two positions (open position and Working position) held by a spring-loaded plate.
  • the locking is released by manually turning the lever by 90 ° into an axially parallel position. Thereafter, the coil can be lifted out of the bobbin.
  • a coil spring between the coil base, ie the underlying coil flange, and the coil carrier. This pushes after release of the coil by the lever, the coil partially out of the bobbin.
  • the spring exerts during braking a braking torque on the coil, which varies depending on the design of the coil surface and can not be influenced. This can hinder the sewing process.
  • a coil holder is known in which the coil is held by a spring-loaded passing through the coil holding mandrel.
  • the retaining pin can be brought by a quarter turn out of the holding in the removal position and dissolves completely together with the coil from the bobbin. The retaining pin must therefore be inserted into this when inserting a full bobbin and then secured.
  • An object of the present invention is to provide a bobbin locking device for holding the bobbin in the bobbin can be without uncontrollable braking forces acting on them, and additionally causes an axial expulsion of the coil or the bobbin case from the bobbin after unlocking.
  • the holding position which holds the coil caught in the bobbin, dissolved and at the same time the partial ejection of the coil can be initiated.
  • the locking of a new coil to be inserted into the bobbin is carried out by axially inserting the bobbin into the bobbin until it abuts in the recess in the bobbin. There are then no further interlocking actions necessary.
  • the coil held by the locking element is braked by the locking element in any way, because the latter does not touch the coil non-positively.
  • the only two-part locking element is captively connected to the bobbin and remains even after removing the coil on the bobbin.
  • FIG. 1 is denoted by reference numeral 1, a bobbin for a coil 3.
  • the coil 3 may have flanges with or without weight-reducing holes.
  • the bobbin 1 comprises a bottom 5, which may be broken to reduce the mass of holes 7.
  • a hollow cylindrical spool 9 is formed with a central bore 10.
  • the bottom 5 In the shell of which two opposing and axially extending slots 11 and 13 are embedded.
  • the bottom 5 may be partially broken, so that recesses 15, 17 are formed.
  • the two recesses 15,17 are not connected to each other, but they are by a web 19 (FIG. Fig.2 ) separated.
  • the web 19 is part of the bottom 5.
  • the axial extent of the first slot 11 is greater than the axial extent of the second slot 13, so that the upper ends 43,45 of the slots 11 and 13 do not have the same distance from the bottom 5 (see . especially FIG. 2 ).
  • the two slots 11,13 form an anti-rotation and an axial stop for a locking element 21, which is biased by a coil spring, short spring 23.
  • the locking element 21 comprises two legs 25,27, on each of which an outwardly projecting foot 29,31 is formed.
  • the two legs 25,27 are spaced from each other in the substantially cylindrical lateral surface 22 of the locking element 21 and are at the feet 29,31 opposite ends with a handle plate 33rd connected.
  • the two legs 25,27 are generated by a slotted cylinder (see. FIG. 6 ).
  • a blind bore 32 in the locking element 21 forms a guide for the spring 23.
  • the handle plate 33 projects beyond the first leg 25 radially.
  • the outer surface 35 of the second leg 27 is flush with the rear edge 37 of the handle plate 33.
  • Below the first leg 25 protruding nose 39 is spaced from the lower edge of a handle plate 33 toward stepped shoulder 41.
  • the foot 41 is wedge-shaped and is transition-free into the surface of the foot 25 over.
  • the two feet 29, 31 project beyond the jacket of the coil mandrel 9 when the locking element 21 is inserted into the bore 10 in the coil carrier 1 or into the coil mandrel 9 in the coil carrier 1. They are guided laterally in the two slots 11,13 (see. FIG. 2 ).
  • the spring 23 is supported on the bottom of the web 19 and the top of the underside of the handle plate 33.
  • the locking element 21 may occupy two different extreme positions in the spool 9: The spool removal position according to FIG. 2 and the working position according to Figures 3 and 4 , In the removal position for the coil 3 according to FIG. 2 is the locking element 21 by the force of the spring 23 in its maximum extended position.
  • the two feet 29,31 are at the two upper ends 43 and 45 of the slots 11 and 13 and prevent that the locking element 21 releases from the spool 9. Because the first slot 11 has a greater axial extent upwards, but the two feet 29, 31 are arranged symmetrically on the locking element 21, the locking element 21 is forcibly moved into an inclined position (cf. FIG. 2 ).
  • the handle plate 33 moves in the direction of the axis X, so that the rear edge 37 and the front edge 47 of the nose 39 come to lie at the same distance from the axis X.
  • This pivoting back of the nose 39 in the direction of the axis of rotation X causes the coil 3 is now freely guided axially over the locking element 21 and removed or placed.
  • this is inserted axially until the lower flange 49 of the coil 3 rests for the time being on the higher foot 29 of the locking element 21.
  • the locking element 21 is in the unlocked position thanks to play in the bore 10 in the spool 9 obliquely and thereby releases the coil 3.
  • the inclination of the locking element 21 in the extended position according to FIG. 2 could alternatively be achieved in that at the same axial length of the two slots 11,13 of the foot 31, which is opposite to the nose 39, have a greater axial thickness would (see dashed line 51 in FIG FIG. 5 ).
  • this design has the disadvantage that the overall height of the bobbin 1 is correspondingly increased, the height of the coil 3 is reduced or the coil would have to be undercut in the central region, so that the additional axial height of the foot 31 in the recess 15 can find room.
  • the locking element 121 is arranged peripherally on the coil carrier 101.
  • the coil carrier 101 can also be produced without a central coil mandrel and the locking element 121 is guided in an axial slot 104, which is embedded in the lateral surface 102 of the coil carrier 101 (FIG. FIGS. 8 and 9 ).
  • the locking element 121 comprises a handle plate 133, a foot 129 and two legs 125 connecting the handle plate 133 and the foot 129.
  • the foot 129 and a nose 139 which is part of the handle plate 133, project beyond the surface of the leg 125 and act as stops for the lower flange 49 of the coil 3 and the upper flange of the coil 3.
  • the spring 23 is supported at its lower end on the bottom 105 of the bobbin 101.
  • the upper end of the spring 23 abuts against a paragraph 141 arranged at a distance from the underside of the handle plate 133 and the nose 139.
  • coil 3 are the flanges of the coil 3 with clearance between the foot 129 and the nose 139.
  • the paragraph 141 is applied to the upper end 106 of the axial slot 104 pressed by the spring 23 at.
  • the locking element similar as in the FIGS. 1 to 5 shown to be arranged vertically displaceable within the spool 9 and include a mechanism as it is used in pens for the movement of the mine use. It is also possible with the scenes known from the pen mechanics to release a locking position by axial pressure and to initiate an axial feed movement with a spring and to reactivate the locking by pressing again.
  • the grip plates 33, 133 are designed in such a way that the lower thread can not catch on being pulled off and also the triggering properties are not impaired.
  • the handle plate 33,133 may be formed in the direction of the nose 39,139 out with a suit that the locking element 21,121, if it has been accidentally placed without coil 3 in the inserted position, when pushing a coil 3 is unlocked immediately by the hollow coil mandrel pushes and by reinserting the coil 3 again assumes the coil-locking position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)

Abstract

A household sewing machine has bobbin located on a spindle within a surrounding capsule. The bobbin core engages with and locks on the spindle with a side spring-operated discrete locking element that is inclined with respect to the bobbin axis (X) of rotation. As soon as the bobbin is placed on the spindle, the locking element tilts and engages to the spindle core (9). The locking element is located fixed within the spindle core central void and engages with the capsule core spindle.

Description

Gegenstand der Erfindung ist eine Verriegelungsvorrichtung für eine Unterfadenspule gemäss Oberbegriff des Patentanspruchs 1.The invention relates to a locking device for a bobbin according to the preamble of patent claim 1.

Die Unterfadenspule von Nähmaschinen, insbesondere Haushaltnähmaschinen, kann entweder direkt im Spulenträger gelagert sein und ist somit direkt zugänglich oder sie kann in einer eigens dafür bestimmten Spulenkapsel eingelegt sein, welche ihrerseits im Spulenträger gelagert ist. Die vorliegende Erfindung bezieht sich auf eine direkt im Spulenträger gelagerte Unterfadenspule; sie lässt sich jedoch auch für eine indirekt in einer Spulenkapsel gelagerten Spule einsetzen.
Aus der DE-A1 3819405 ist eine Spulenkapsel für Umlaufgreifer bekannt, bei der die Spule auf einem zylindrischen Spulendorn, der Teil der Spulenkapsel ist, aufgeschoben und von einem Sicherungshebel gehalten ist. Der Sicherungshebel, als zweiarmiger Hebel ausgebildet, wird in den beiden Stellungen (Offenstellung und Arbeitsstellung) von einer federbelasteten Platte gehalten. Das Lösen der Verriegelung erfolgt durch manuelles Schwenken des Hebels um 90°in eine achsparallele Lage. Danach kann die Spule aus dem Spulenträger herausgehoben werden. Um das Herausheben der Spule aus dem Spulenträger zu erleichtern, wird in der DE-A1 19510830 vorgeschlagen, zwischen Spulenunterseite, d.h. dem untenliegenden Spulenflansch, und dem Spulenträger eine Schraubenfeder einzulegen. Diese drückt nach Freigabe der Spule durch den Hebel die Spule teilweise aus dem Spulenträger hinaus. Gleichzeitig übt die Feder während des Nähens ein Bremsmoment auf die Spule aus, welches je nach Ausbildung der Spulenoberfläche unterschiedlich ausfällt und nicht beeinflussbar ist. Dies kann den Nähvorgang behindern.
Aus der GB-A 2149433 ist weiter ein Spulenhalter bekannt, bei dem die Spule durch einen federbelasteten durch die Spule hindurchführbaren Haltedorn gehalten wird. Der Haltedorn kann durch eine Viertelsdrehung aus der Haltein die Entnahmestellung gebracht werden und löst sich zusammen mit der Spule vollständig vom Spulenträger. Der Haltedorn muss folglich beim Einlegen einer vollen Spule in diese eingeführt und danach gesichert werden.The bobbin of sewing machines, especially household sewing machines, can either be stored directly in the bobbin and is thus directly accessible or it can be inserted in a specially designed bobbin case, which in turn is mounted in the bobbin. The present invention relates to a bobbin mounted directly in the bobbin; However, it can also be used for a coil mounted indirectly in a bobbin case.
From the DE-A1 3819405 a bobbin case for rotary gripper is known in which the coil on a cylindrical spool, which is part of the bobbin case, pushed and held by a safety lever. The safety lever, designed as a two-armed lever, is in the two positions (open position and Working position) held by a spring-loaded plate. The locking is released by manually turning the lever by 90 ° into an axially parallel position. Thereafter, the coil can be lifted out of the bobbin. To facilitate the lifting of the coil from the bobbin, is in the DE-A1 19510830 proposed to insert a coil spring between the coil base, ie the underlying coil flange, and the coil carrier. This pushes after release of the coil by the lever, the coil partially out of the bobbin. At the same time the spring exerts during braking a braking torque on the coil, which varies depending on the design of the coil surface and can not be influenced. This can hinder the sewing process.
From the GB-A 2149433 Further, a coil holder is known in which the coil is held by a spring-loaded passing through the coil holding mandrel. The retaining pin can be brought by a quarter turn out of the holding in the removal position and dissolves completely together with the coil from the bobbin. The retaining pin must therefore be inserted into this when inserting a full bobbin and then secured.

Eine Aufgabe der vorliegenden Erfindung ist die Schaffung einer Verriegelungsvorrichtung für eine Unterfadenspule, mit der die Unterfadenspule im Spulenträger gehalten werden kann, ohne dass unkontrollierbare Bremskräfte auf sie einwirken, und die zusätzlich ein axiales Ausschieben der Spule oder der Spulenkapsel aus dem Spulenträger nach der Entriegelung bewirkt.An object of the present invention is to provide a bobbin locking device for holding the bobbin in the bobbin can be without uncontrollable braking forces acting on them, and additionally causes an axial expulsion of the coil or the bobbin case from the bobbin after unlocking.

Gelöst wird diese Aufgabe durch eine Verriegelungsvorrichtung gemäss den Merkmalen des Patentanspruchs 1. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen näher umschrieben.This object is achieved by a locking device according to the features of claim 1. Advantageous embodiments of the invention are described in more detail in the dependent claims.

Durch leichten Druck auf das Verriegelungselement, welches die Spule axial geringfügig überragt, kann die Halteposition, welche die Spule im Spulenträger gefangen hält, aufgelöst und gleichzeitig der teilweise Auswurf der Spule eingeleitet werden. Die Verriegelung einer neuen in den Spulenträger einzusetzenden Spule erfolgt durch axiales Einschieben der Spule in den Spulenträger, bis diese in der Ausnehmung im Spulenträger anstösst. Es sind danach keine weiteren Verriegelungshandlungen notwendig. Die vom Verriegelungselement gehaltene Spule wird durch das Verriegelungselement in keiner Art und Weise gebremst, weil letzteres die Spule nicht kraftschlüssig berührt. Das nur aus zwei Teilen bestehende Verriegelungselement ist unverlierbar mit dem Spulenträger verbunden und verbleibt auch nach dem Entnehmen der Spule am Spulenträger.By slight pressure on the locking element, which projects slightly beyond the coil axially, the holding position, which holds the coil caught in the bobbin, dissolved and at the same time the partial ejection of the coil can be initiated. The locking of a new coil to be inserted into the bobbin is carried out by axially inserting the bobbin into the bobbin until it abuts in the recess in the bobbin. There are then no further interlocking actions necessary. The coil held by the locking element is braked by the locking element in any way, because the latter does not touch the coil non-positively. The only two-part locking element is captively connected to the bobbin and remains even after removing the coil on the bobbin.

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

Figur 1
eine perspektivische Explosionsdarstellung eines Spulenträgers mit dem Verriegelungselement und einer Spule,
Figur 2
einen Axialschnitt durch den Spulenträger mit ausgeworfener Spule,
Figur 3
einen Axialschnitt durch den Spulenträger mit verriegelter Spule und
Figur 4
eine vergrösserte Darstellung des Ausschnitts A in Figur 3,
Figur 5
eine Seitenansicht des Verriegelungselementes,
Figur 6
einen Querschnitt durch das Verriegelungselement längs Linie V - V in Figur 5,
Figur 7
eine perspektivische Explosionsdarstellung eines Spulenträgers mit einem Verriegelungselement und einer Spule in einer weiteren Ausgestaltung der Erfindung,
Figur 8
einen Axialschnitt durch den Spulenträger mit ausgeworfener Spule gemäss Figur 7,
Figur 9
einen Axialschnitt durch den Spulenträger mit verriegelter Spule,
Figur 10
einen Axialschnitt durch den Spulenträger mit ausgeworfener Spule in einer weiteren Ausgestaltung der Erfindung.
Reference to an illustrated embodiment, the invention is explained in detail. Show it
FIG. 1
an exploded perspective view of a bobbin with the locking element and a coil,
FIG. 2
an axial section through the bobbin with ejected coil,
FIG. 3
an axial section through the bobbin with locked coil and
FIG. 4
an enlarged view of the section A in FIG. 3 .
FIG. 5
a side view of the locking element,
FIG. 6
a cross section through the locking element along line V - V in FIG. 5 .
FIG. 7
an exploded perspective view of a bobbin with a locking element and a coil in a further embodiment of the invention,
FIG. 8
an axial section through the bobbin with ejected coil according FIG. 7 .
FIG. 9
an axial section through the bobbin with locked coil,
FIG. 10
an axial section through the bobbin with ejected coil in a further embodiment of the invention.

In Figur 1 ist mit Bezugszeichen 1 ein Spulenträger für eine Spule 3 bezeichnet. Die Spule 3 kann Flanschen mit oder ohne gewichtsreduzierende Löcher aufweisen. Der Spulenträger 1 umfasst einen Boden 5, der zur Verringerung der Masse von Löchern 7 durchbrochen sein kann. Im Zentrum des Bodens 5 ist ein hohlzylindrischer Spulendorn 9 mit einer zentralen Bohrung 10 angeformt. In dessen Mantel sind zwei sich gegenüberliegende und sich axial erstreckende Schlitze 11 und 13 eingelassen. Im Bereich der Schlitze 11,13 kann der Boden 5 teilweise durchbrochen sein, so dass Ausnehmungen 15,17 entstehen. Die beiden Ausnehmungen 15,17 sind nicht miteinander verbunden, sondern sie werden durch einen Steg 19 (Fig.2) getrennt. Der Steg 19 ist Teil des Bodens 5. Die axiale Ausdehnung des ersten Schlitzes 11 ist grösser als die axiale Ausdehnung des zweiten Schlitzes 13, so dass die oberen Enden 43,45 der Schlitze 11 und 13 nicht den gleichen Abstand zum Boden 5 aufweisen (vgl. insbesondere Figur 2). Die beiden Schlitze 11,13 bilden eine Verdrehsicherung und einen axialen Anschlag für ein Verriegelungselement 21, das durch eine Schraubenfeder, kurz Feder 23, vorgespannt ist. Das Verriegelungselement 21 umfasst zwei Beine 25,27, an denen je ein nach aussen ragender Fuss 29,31 angeformt ist. Die beiden Beine 25,27 liegen beabstandet zueinander in der im wesentlichen zylindrischen Mantelfläche 22 des Verriegelungselements 21 und sind an den den Füssen 29,31 gegenüberliegenden Enden mit einer Griffplatte 33 verbunden. Vorzugsweise sind die beiden Beine 25,27 durch einen aufgeschlitzten Zylinder erzeugt (vgl. Figur 6). Eine Sackbohrung 32 im Verriegelungselement 21 bildet eine Führung für die Feder 23. Die Griffplatte 33 überragt das erste Bein 25 radial. Die aussenliegende Fläche 35 des zweiten Beins 27 liegt bündig zur rückwärtigen Kante 37 der Griffplatte 33. Unterhalb der das erste Bein 25 überragenden Nase 39 liegt beabstandet zu deren Unterkante ein zur Griffplatte 33 hin stufenförmiger Absatz 41. Fussseitig ist der Absatz 41 keilförmig und geht übergangsfrei in die Oberfläche des Fusses 25 über.
Die beiden Füsse 29,31 überragen den Mantel des Spulendorns 9, wenn das Verriegelungselement 21 in die Bohrung 10 im Spulenträger 1 bzw. in den Spulendorn 9 im Spulenträger 1 eingesetzt ist. Sie werden seitlich in den beiden Schlitzen 11,13 geführt (vgl. Figur 2). Die Feder 23 ist unten auf dem Steg 19 und oben an der Unterseite der Griffplatte 33 abgestützt.
Das Verriegelungselement 21 kann im Spulendorn 9 zwei unterschiedliche Extrem-Stellungen einnehmen: Die Spulen-Entnahmeposition gemäss Figur 2 und die Arbeitsposition gemäss den Figuren 3 und 4.
In der Entnahmeposition für die Spule 3 gemäss Figur 2 liegt das Verriegelungselement 21 durch die Kraft der Feder 23 in seiner maximal ausgefahrenen Position. Die beiden Füsse 29,31 liegen an den beiden oberen Enden 43 und 45 der Schlitze 11 und 13 an und verhindern, dass sich das Verriegelungselement 21 vom Spulendorn 9 löst. Weil der erste Schlitz 11 nach oben eine grössere axiale Ausdehnung aufweist, die beiden Füsse 29,31 jedoch symmetrisch am Verriegelungselement 21 angeordnet sind, gelangt das Verriegelungselement 21 zwangsweise in eine Schrägstellung (vgl. Figur 2). Durch die Schrägstellung des Verriegelungselements 21 bezüglich der Spulenträgerachse X verschiebt sich auch die Griffplatte 33 in Richtung zur Achse X hin, so dass deren rückwärtige Kante 37 und die Vorderkante 47 der Nase 39 in gleichem Abstand zur Achse X zu liegen kommen. Dieses Zurückschwenken der Nase 39 in Richtung auf die Drehachse X bewirkt, dass die Spule 3 nun ungehindert axial über das Verriegelungselement 21 geführt und entnommen bzw. aufgesetzt werden kann. Beim Einsetzen der neuen Spule 3 wird diese axial eingeschoben, bis der untere Flansch 49 der Spule 3 vorerst am höher liegenden Fuss 29 des Verriegelungselements 21 anliegt. Durch einen weiteren Druck mit einer Kraft F auf die Spule 3 oder auf die Griffplatte 33 drückt diese das Verriegelungselement 21 gegen die Kraft der Feder 23 sukzessive nach unten. Spätestens wenn der Flansch 49 am Boden 5 des Spulenträgers 1 anstösst, kippt das Verriegelungselement 21 im Uhrzeigersinn und der Absatz 41 unter der Nase 39 rastet am oberen Ende 43 des Schlitzes 11 im Spulendorn 9 ein (Figuren 3 und 4). Die beiden Füsse 29,31 liegen nun parallel zum Boden 5 und zum unteren Flansch 49 der Spule 3. Da der Abstand a zwischen der Unterseite der Nase 39 und der Oberseite des Bodens 5 grösser ist als die gesamte axiale Länge L der Spule 3 (vgl. Figur 3), liegt diese mit Spiel im Spulenträger 1 gehalten. Durch die Kraft der Feder 23 bleibt die Verrastung des Verriegelungselements 21 so lange aufrecht erhalten, bis durch die Bedienungsperson der Nähmaschine eine radiale Verschiebekraft R auf die Nase 39 des Verriegelungselements 21 ausgeübt wird, um die Spule 3 zu entnehmen. Durch die Kraft R schwenkt das Verriegelungselement 21 in Figur 3 im Gegenuhrzeigersinn, der Absatz 41 löst sich aus dem Schlitz 11 und die Spule 3 wird durch die Kraft der Feder 23 zusammen mit dem Verriegelungselement 21 aus dem Innern des Spulenträgers 1 mindestens teilweise herausgeschoben und kann entnommen werden.
In einer weiteren Ausgestaltung der Erfindung gemäss Figur 10 kann im Spulendorn 9 nur ein Schlitz 13 ausgebildet sein, in den ein einziger Fuss 31 am Verriegelungselement 21 eingreift. Das Verriegelungselement 21 stellt sich in entriegelter Stellung dank Spiel in der Bohrung 10 im Spulendorn 9 schräg und gibt dadurch die Spule 3 frei.
Die Schrägstellung des Verriegelungselements 21 in der ausgefahrenen Stellung gemäss Figur 2 könnte alternativ auch dadurch erreicht werden, dass bei gleicher axialer Länge der beiden Schlitze 11,13 der Fuss 31, der der Nase 39 gegenüberliegt, eine grössere axiale Dicke aufweisen würde (vgl. gestrichelte Linie 51 in Figur 5). Diese Ausführung hat allerdings den Nachteil, dass die Bauhöhe des Spulenträgers 1 entsprechend vergrössert, die Höhe der Spule 3 verkleinert oder die Spule im zentralen Bereich hinterschnitten werden müsste, damit die zusätzliche axiale Höhe des Fusses 31 in der Ausnehmung 15 Raum finden kann.In FIG. 1 is denoted by reference numeral 1, a bobbin for a coil 3. The coil 3 may have flanges with or without weight-reducing holes. The bobbin 1 comprises a bottom 5, which may be broken to reduce the mass of holes 7. In the center of the bottom 5, a hollow cylindrical spool 9 is formed with a central bore 10. In the shell of which two opposing and axially extending slots 11 and 13 are embedded. In the area of the slots 11, 13, the bottom 5 may be partially broken, so that recesses 15, 17 are formed. The two recesses 15,17 are not connected to each other, but they are by a web 19 (FIG. Fig.2 ) separated. The web 19 is part of the bottom 5. The axial extent of the first slot 11 is greater than the axial extent of the second slot 13, so that the upper ends 43,45 of the slots 11 and 13 do not have the same distance from the bottom 5 (see . especially FIG. 2 ). The two slots 11,13 form an anti-rotation and an axial stop for a locking element 21, which is biased by a coil spring, short spring 23. The locking element 21 comprises two legs 25,27, on each of which an outwardly projecting foot 29,31 is formed. The two legs 25,27 are spaced from each other in the substantially cylindrical lateral surface 22 of the locking element 21 and are at the feet 29,31 opposite ends with a handle plate 33rd connected. Preferably, the two legs 25,27 are generated by a slotted cylinder (see. FIG. 6 ). A blind bore 32 in the locking element 21 forms a guide for the spring 23. The handle plate 33 projects beyond the first leg 25 radially. The outer surface 35 of the second leg 27 is flush with the rear edge 37 of the handle plate 33. Below the first leg 25 protruding nose 39 is spaced from the lower edge of a handle plate 33 toward stepped shoulder 41. The foot 41 is wedge-shaped and is transition-free into the surface of the foot 25 over.
The two feet 29, 31 project beyond the jacket of the coil mandrel 9 when the locking element 21 is inserted into the bore 10 in the coil carrier 1 or into the coil mandrel 9 in the coil carrier 1. They are guided laterally in the two slots 11,13 (see. FIG. 2 ). The spring 23 is supported on the bottom of the web 19 and the top of the underside of the handle plate 33.
The locking element 21 may occupy two different extreme positions in the spool 9: The spool removal position according to FIG. 2 and the working position according to Figures 3 and 4 ,
In the removal position for the coil 3 according to FIG. 2 is the locking element 21 by the force of the spring 23 in its maximum extended position. The two feet 29,31 are at the two upper ends 43 and 45 of the slots 11 and 13 and prevent that the locking element 21 releases from the spool 9. Because the first slot 11 has a greater axial extent upwards, but the two feet 29, 31 are arranged symmetrically on the locking element 21, the locking element 21 is forcibly moved into an inclined position (cf. FIG. 2 ). Due to the inclination of the locking element 21 with respect to the bobbin X axis, the handle plate 33 moves in the direction of the axis X, so that the rear edge 37 and the front edge 47 of the nose 39 come to lie at the same distance from the axis X. This pivoting back of the nose 39 in the direction of the axis of rotation X causes the coil 3 is now freely guided axially over the locking element 21 and removed or placed. When inserting the new coil 3, this is inserted axially until the lower flange 49 of the coil 3 rests for the time being on the higher foot 29 of the locking element 21. By a further pressure with a force F on the coil 3 or on the handle plate 33, this presses the locking element 21 against the force of the spring 23 successively downwards. At the latest when the flange 49 abuts the bottom 5 of the bobbin 1, the locking element 21 tilts clockwise and the paragraph 41 under the nose 39 snaps into place at the upper end 43 of the slot 11 in the spool 9 ( Figures 3 and 4 ). The two feet 29,31 are now parallel to the bottom 5 and the lower flange 49 of the coil 3. Since the distance a between the bottom of the nose 39 and the top of the bottom 5 is greater than the total axial length L of the coil 3 (see. FIG. 3 ), this is held with game in the bobbin 1. By the force of the spring 23, the latching of the locking element 21 is maintained until a radial displacement force R is exerted on the nose 39 of the locking element 21 by the operator of the sewing machine to remove the coil 3. By the force R, the locking element 21 pivots in FIG. 3 in the counterclockwise direction, the paragraph 41 releases from the slot 11 and the coil 3 is at least partially pushed out by the force of the spring 23 together with the locking element 21 from the interior of the bobbin 1 and can be removed.
In a further embodiment of the invention according to FIG. 10 may be formed in the spool 9, only one slot 13, in which a single foot 31 engages the locking element 21. The locking element 21 is in the unlocked position thanks to play in the bore 10 in the spool 9 obliquely and thereby releases the coil 3.
The inclination of the locking element 21 in the extended position according to FIG. 2 could alternatively be achieved in that at the same axial length of the two slots 11,13 of the foot 31, which is opposite to the nose 39, have a greater axial thickness would (see dashed line 51 in FIG FIG. 5 ). However, this design has the disadvantage that the overall height of the bobbin 1 is correspondingly increased, the height of the coil 3 is reduced or the coil would have to be undercut in the central region, so that the additional axial height of the foot 31 in the recess 15 can find room.

In einer weiteren Ausgestaltung der Erfindung gemäss den Figuren 7 bis 9 ist das Verriegelungselement 121 peripher am Spulenträger 101 angeordnet. Der Spulenträger 101 kann auch ohne zentralen Spulendorn hergestellt sein und das Verriegelungselement 121 ist in einem in der Mantelfläche 102 des Spulenträgers 101 eingelassenen axialen Schlitz 104 geführt (Figuren 8 und 9). Das Verriegelungselement 121 umfasst eine Griffplatte 133, einen Fuss 129 und zwei die Griffplatte 133 und den Fuss 129 verbindende Beine 125. Der Fuss 129 und eine Nase 139, welche Teil der Griffplatte 133 ist, überragen die Oberfläche des Beines 125 und fungieren als Anschläge für den unteren Flansch 49 der Spule 3 bzw. den oberen Flansch der Spule 3. Die Feder 23 ist mit ihrem unteren Ende auf dem Boden 105 des Spulenträgers 101 abgestützt. Das obere Ende der Feder 23 liegt an einem in einem Abstand von der Unterseite der Griffplatte 133 bzw. der Nase 139 angeordneten Absatz 141 an.
Bei vollständig in den Spulenträger 101 eingeführter Spule 3 liegen die Flanschen der Spule 3 mit Spiel zwischen dem Fuss 129 und der Nase 139. Der Absatz 141 liegt am oberen Ende 106 des axialen Schlitzes 104 durch die Feder 23 angepresst an.
Zum Entriegeln der Spule 3 und Herausnehmen der letzteren aus dem Spulenträger 101 wird auf die Griffplatte 133 eine Kraft in Richtung des Pfeiles R ausgeübt, bis der Absatz 141 ausser Eingriff mit dem oberen Ende 106 des Schlitzes 104 geführt ist und dadurch das Verriegelungselement 121 durch die Kraft der Feder 23 so weit nach oben geführt wird, bis der Fuss 129 am oberen Ende 106 des Schlitzes 104 anliegt (Figur 8). Durch die verschiebende Kraft R wird das Verriegelungselement 121 geschwenkt und die Spule 3 kann ungehindert aus dem Spulenträger 101 herausgehoben werden.
Bei eingelegter Spule 103 gemäss Figur 9 wird die Spule 3 durch das Verriegelungselement mit Spiel gehalten, d.h. es findet keine bremsende unkontrollierbare Krafteinwirkung auf die Spule während des Nähens statt.In a further embodiment of the invention according to the FIGS. 7 to 9 the locking element 121 is arranged peripherally on the coil carrier 101. The coil carrier 101 can also be produced without a central coil mandrel and the locking element 121 is guided in an axial slot 104, which is embedded in the lateral surface 102 of the coil carrier 101 (FIG. FIGS. 8 and 9 ). The locking element 121 comprises a handle plate 133, a foot 129 and two legs 125 connecting the handle plate 133 and the foot 129. The foot 129 and a nose 139, which is part of the handle plate 133, project beyond the surface of the leg 125 and act as stops for the lower flange 49 of the coil 3 and the upper flange of the coil 3. The spring 23 is supported at its lower end on the bottom 105 of the bobbin 101. The upper end of the spring 23 abuts against a paragraph 141 arranged at a distance from the underside of the handle plate 133 and the nose 139.
When fully inserted into the bobbin 101 coil 3 are the flanges of the coil 3 with clearance between the foot 129 and the nose 139. The paragraph 141 is applied to the upper end 106 of the axial slot 104 pressed by the spring 23 at.
To unlock the bobbin 3 and removing the latter from the bobbin 101, a force in the direction of the arrow R is exerted on the handle plate 133 until the heel 141 out of engagement with the upper end 106 of the slot 104 and thereby the locking member 121 through the Force of the spring 23 is guided so far until the foot 129 at the upper end 106 of the slot 104 is applied ( FIG. 8 ). By the shifting force R, the locking element 121 is pivoted and the coil 3 can be lifted out of the bobbin 101 unhindered.
With inserted coil 103 according to FIG. 9 the coil 3 is held by the locking element with play, ie there is no braking uncontrollable force on the spool during sewing instead.

In einer weiteren nicht dargestellten Ausgestaltung der Erfindung kann das Verriegelungselement, ähnlich wie in den Figuren 1 bis 5 dargestellt, innerhalb des Spulendorns 9 vertikal verschiebbar angeordnet sein und eine Mechanik umfassen, wie sie bei Kugelschreibern für die Bewegung der Mine Verwendung findet. Mit der aus den Kugelschreiber-Mechaniken bekannten Kulissen ist es ebenfalls möglich, durch axialen Druck eine Verriegelungsstellung zu lösen und mit einer Feder eine axiale Vorschubbewegung auszulösen und bei erneutem Drücken die Verriegelung wieder zu aktivieren.In a further embodiment of the invention, not shown, the locking element, similar as in the FIGS. 1 to 5 shown to be arranged vertically displaceable within the spool 9 and include a mechanism as it is used in pens for the movement of the mine use. It is also possible with the scenes known from the pen mechanics to release a locking position by axial pressure and to initiate an axial feed movement with a spring and to reactivate the locking by pressing again.

Selbstverständlich sind bei allen beschriebenen Ausführungen die Griffplatten 33,133 derart ausgestaltet, dass der Unterfaden bei dessen Abzug nicht daran hängen bleiben kann und auch die Abzugseigenschaften nicht beeinträchtigt werden.
Im weiteren kann die Griffplatte 33,133 in Richtung zur Nase 39,139 hin derart mit Anzug geformt sein, dass das Verriegelungselement 21,121, wenn es aus Versehen ohne Spule 3 in die eingeschobene Stellung gebracht worden ist, beim Darüberschieben einer Spule 3 sofort entriegelt wird, sich durch den hohlen Spulendorn schiebt und durch das weitere Einschieben der Spule 3 erneut die Spulen-Verriegelungsstellung einnimmt.Of course, in all the embodiments described, the grip plates 33, 133 are designed in such a way that the lower thread can not catch on being pulled off and also the triggering properties are not impaired.
Furthermore, the handle plate 33,133 may be formed in the direction of the nose 39,139 out with a suit that the locking element 21,121, if it has been accidentally placed without coil 3 in the inserted position, when pushing a coil 3 is unlocked immediately by the hollow coil mandrel pushes and by reinserting the coil 3 again assumes the coil-locking position.

Claims (12)

  1. Locking device for a lower thread bobbin (3) in a bobbin carrier (1, 101) of a sewing machine, including an accommodation area in the bobbin carrier (1, 101) for the lower thread bobbin (3) and a locking element (21) for securing the lower thread bobbin (3) in the bobbin carrier (1), characterised in that the locking element (21) is displaceably guided in the bobbin carrier (1, 101) and is retained therein, by the force of a spring (23), in the locked position and in the unlocked position.
  2. Locking device according to claim 1, characterised in that the locking element (21) is retained, in an axially displaceable manner and secured against rotation, in a bobbin spindle (9) in the bobbin carrier (1).
  3. Locking device according to claim 2, characterised in that the bobbin spindle (9) includes a central bore (10), in which the locking element (21) is guided.
  4. Locking device according to claims 1 to 3, characterised in that, in the locking element (21), an axially extending blind bore (32) is provided, in which a spring (23) is inserted and supported with one of its ends.
  5. Locking device according to claim 4, characterised in that the spring (23) is supported with its second end on the base (5) or on the web (19) of the bobbin carrier (1).
  6. Locking device according to claims 1 to 5, characterised in that, on the bobbin spindle (9), at least one axially extending slot (11, 13) is provided, in which protrudes a foot (29, 31) which is moulded on the locking element (21).
  7. Locking device according to claim 6, characterised in that, if there is more than one slot (13), one of the slots (11) is longer than at least one other slot (13).
  8. Locking device according to claim 6 or 7, characterised in that, on the locking element (21), a gripping plate (33) with a projection (39) is provided, which protrudes over the surface (22) beyond one of the feet (29) of the locking element (21).
  9. Locking device according to claim 8, characterised in that, axially offset relative to the surface of the gripping plate (33), a shoulder portion (41) is provided, which locks in the slot (11) when the locking element (21) is pushed into the bobbin spindle (9).
  10. Locking device according to claims 5 to 9, characterised in that, in the base (5) of the bobbin carrier (1) beneath the at least one foot (29, 31), a recess (15, 17) is provided, in which engages the at least one foot (29, 31) when the bobbin (3) is inserted into the bobbin carrier (1).
  11. Locking device according to claim 1, characterised in that the locking element (121) is guided, in an axially displaceable and lockable manner, in an axial slot (104) in the surface of the bobbin carrier (101).
  12. Locking device according to claim 11, characterised in that the locking element (121) includes a foot (129), a gripping plate (133) and, at a spacing therefrom, a shoulder portion (141) and at least one leg (125), which connects the foot (129) and the gripping plate (133), as well as a spring (23), the shoulder portion (141) and the foot (129) determining the two extreme positions of the locking element (121) in the bobbin carrier (101).
EP04405582A 2003-12-10 2004-09-16 Locking device for lower thread bobbin Expired - Lifetime EP1541736B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH21052003 2003-12-10
CH21052003 2003-12-10

Publications (3)

Publication Number Publication Date
EP1541736A2 EP1541736A2 (en) 2005-06-15
EP1541736A3 EP1541736A3 (en) 2006-04-26
EP1541736B1 true EP1541736B1 (en) 2008-05-21

Family

ID=34468809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04405582A Expired - Lifetime EP1541736B1 (en) 2003-12-10 2004-09-16 Locking device for lower thread bobbin

Country Status (4)

Country Link
US (1) US7036444B2 (en)
EP (1) EP1541736B1 (en)
AT (1) ATE396293T1 (en)
DE (1) DE502004007215D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221410A1 (en) 2009-02-17 2010-08-25 BERNINA International AG Locking device for spool capsule for a bobbin thread spool
EP2463430A1 (en) 2010-12-09 2012-06-13 BERNINA International AG Interlocking device for a spooling capsule

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008014913B3 (en) * 2008-03-19 2009-07-30 Dürkopp Adler AG Gripper for a double lockstitch sewing machine
DE102008030001A1 (en) * 2008-06-24 2009-12-31 Dürkopp Adler AG Gripper for a double lockstitch sewing machine
IT1400006B1 (en) * 2010-03-15 2013-05-09 Cracco PERFECTED CROCHET GROUP, PARTICULARLY FOR SEWING MACHINES.
JP2012115595A (en) * 2010-12-03 2012-06-21 Brother Ind Ltd Bobbin, and sewing machine
CN104278437A (en) * 2013-07-03 2015-01-14 启翔股份有限公司 Horizontal rotating shuttle of sewing machine
USD843977S1 (en) * 2017-07-11 2019-03-26 Aiwu Wang Winder
JP1610198S (en) * 2017-09-25 2018-07-30

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Publication number Priority date Publication date Assignee Title
US663675A (en) * 1900-08-07 1900-12-11 Singer Mfg Co Bobbin-case holder and bobbin-ejector for sewing-machines.
US832414A (en) * 1905-11-16 1906-10-02 Wheeler & Wilson Mfg Co Sewing-machine bobbin-case.
US2813500A (en) * 1951-06-26 1957-11-19 Singer Mfg Co Bobbin-cases for sewing machines
US2848965A (en) * 1954-01-25 1958-08-26 White Sewing Machine Corp Sewing machine
US3381643A (en) * 1966-10-10 1968-05-07 Singer Co Bobbin-supporting assemblies for sewing machines
US4462324A (en) * 1983-11-07 1984-07-31 The Singer Company Bobbin and plunger assembly
CS262030B1 (en) * 1987-06-15 1989-02-10 Jaromir Dvoracek Bobbin case of a rotating looper with vertical axis of rotation
DE19510830C2 (en) 1995-03-24 2001-11-22 Duerkopp Adler Ag Bobbin brake for the hook thread bobbin of a lockstitch sewing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221410A1 (en) 2009-02-17 2010-08-25 BERNINA International AG Locking device for spool capsule for a bobbin thread spool
EP2463430A1 (en) 2010-12-09 2012-06-13 BERNINA International AG Interlocking device for a spooling capsule

Also Published As

Publication number Publication date
US7036444B2 (en) 2006-05-02
EP1541736A3 (en) 2006-04-26
DE502004007215D1 (en) 2008-07-03
US20050126461A1 (en) 2005-06-16
ATE396293T1 (en) 2008-06-15
EP1541736A2 (en) 2005-06-15

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