EP2138621B1 - Sewing machine and spool device for operating such a sewing machine - Google Patents

Description

The invention relates to a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a winding device for such a sewing machine.

A sewing machine of the type mentioned is known by public prior use. A defined frictional engagement must be ensured between the coil housing of a coil to be wound up and a winder shaft of the winding device, in order to ensure that the rotating winder shaft takes along the coil housing. Often can be in a winding device in which this frictional engagement is given, the bobbin case no longer easily plug on the winder shaft, but tends to tilt or requires an increased Aufsteckkraft.

The GB 5714 describes a winding device with a friction wheel drive. The friction wheel is rotatably connected to a winder shaft, wherein on the friction wheel opposite end of the winder shaft, a coil housing can be plugged. The winder shaft has an inner cavity into which a central pin is inserted, which in turn provides for the rotationally fixed connection of the winder shaft with the friction wheel.

The DE 20 2004 012 028 U1 describes a coil receptacle for a yarn stand with a hollow shaft in which a receiving pin of the Garnständers is accommodated in the manner of a needle bearing. A bearing receiver is formed by a threaded pin designed in the manner of a grub screw. This is screwed into an internal thread of the hollow shaft. As a result, a contact point of the bearing of the hollow shaft can be adjusted in height.

It is an object of the present invention, a sewing machine of the type mentioned in such a way that the bobbin case can be easily attached to the winder shaft of the winding device without having to make cuts in a secure frictional connection of the bobbin with the winder shaft.

This object is achieved by a sewing machine with the features specified in claim 1.

According to the invention it has been recognized that a winder shaft with adjustable outer diameter on the other hand can reconcile the conflicting requirements of easy Aufsteckbarkeit the bobbin on the winder shaft on the one hand and the secure frictional connection between the bobbin case and the winder shaft. The Au-β diameter of the winder shaft can be adjusted by means of the screw-in by spreading the winder shaft so that both conditions, ie Aufsteckbarkeit one hand and secure frictional engagement on the other hand, are met simultaneously.

A tapered cavity according to claim 2, in particular a tapered internal thread according to claim 3, leads to a Aufspreizwirkung when screwing the Einschraubkörpers in the taper.

An internal thread according to claim 4 represents a cost-producible variant of an internal thread with decreasing internal thread diameter is particularly favorable, the production of such internal thread with conically tapered threaded portion, when the tapered threaded portion represents the gate portion of a used for producing the internal thread tap.

Accordingly, a thread according to claim 5 can be produced inexpensively.

A blind thread according to claim 6 leads to a robust winder shaft. The cavity section with an enlarged diameter relative to the bag section can in particular be designed as a bore running transversely through the winder shaft.

A grub screw according to claim 7 is inexpensive.

A longitudinal slot according to claim 8 allows an outer diameter enlargement by spreading the winder shaft. Alternatively, it is possible to form the winder shaft of an elastomeric material, so that there is a Aufspreizwirkung even without such a longitudinal slot.

A conically tapered cavity section according to claim 9 allows interaction with the screw-in without necessarily a conically tapered internal thread section must be present. This simplifies the production of the winder shaft. Instead of a conical taper and a non-linear taper, such as a convex or concave or otherwise curved curvature of the cavity or the internal thread is possible, so that the Aufspreizwirkung depends in a corresponding manner nonlinearly on the depth of insertion of the screw.

A guide portion according to claim 10 allows interaction of the screw-in body with the tapered cavity, without an external thread of the screw-in body comes into contact with the tapered cavity. This protects the screw-in body. The guide portion may be tapered or otherwise non-linearly tapered.

An elastomeric body according to claim 11 leads to a Aufspreizwirkung during compression of the elastomeric body between the screw-in and a sack end of the thread. In principle, in such an embodiment with an elastomer body, the cavity can also be configured without a tapered cavity section. The Aufspreizwirkung then arises solely due to a radial force exerted by the elastomeric body on the surrounding Spulser shaft and which is brought about by a compression of the elastomer body by the screw-in.

The advantages of a winding device according to claim 12 correspond to those which have already been explained above with reference to the sewing machine.

Fig. 1

schematisch eine Vorderansicht einer Nähmaschine mit einer Spuleinrichtung zum Aufwickeln einer Spule von einer Garnrolle;

Fig. 2

perspektivisch und vergrößert die Spuleinrichtung der Nähmaschine nach Fig. 1;

Fig. 3

eine Detailansicht von Komponenten der Spuleinrichtung inklusive eines Einrückkörpers zum Stoppen einer Drehbewegung eines Spulenrades der Spuleinrichtung aus Blickrichtung III in Fig. 2;

Fig. 4

eine Aufsicht auf die Spuleinrichtung vor Beginn eines Spulvorgangs und nach dem Einklemmen eines aufzuspulenden Fadens unter einem Abreißmesser;

Fig. 5

in einer zu Fig. 4 ähnlichen Darstellung die Spuleinrichtung unmittelbar nach Beginn des Spulvorgangs;

Fig. 6

eine Aufsicht auf einen Ausschnitt der Nähmaschine nach Fig. 1 aus Blickrichtung VI in der Fig. 1;

Fig. 7

einen Schnitt gemäß Linie VII-VII in Fig. 6, der Details zum Antrieb der Spuleinrichtung zeigt;

Fig. 8 bis 12 zu Fig. 7

ähnliche Ansichten weiterer Momentanstellungen des Antriebs der Spuleinrichtung während des Spulvorgangs;

Fig. 13

in einer zu Fig. 2 ähnlichen Darstellung eine weitere Ausführung einer Spuleinrichtung;

Fig. 14

eine Ausschnittsvergrößerung eines Hakens eines Einrückkörpers der Spuleinrichtung, eingerückt in ein Spulenrad, in einer zu Fig. 7 ähnlichen Darstellung zur Erläuterung weiterer Ausführungsvariante der Spuleinrichtung;

Fig. 15

einen Längsschnitt durch die Spuleinrichtung nach den Fig. 1 bis 13 in einer Schnittebene parallel zur Zeichenebene nach Fig. 6;

Fig. 16

eine Ausschnittsvergrößerung des Details XVI in Fig. 15;

Fig. 17

in einer zu Fig. 16 ähnlichen Darstellung eine weitere Ausführung einer Spulerwelle der Spuleinrichtung; und

Fig. 18

in einer zu Fig. 16 ähnlichen Darstellung eine weitere Ausführung einer Spulerwelle der Spuleinrichtung.

Embodiments of the invention will be explained in more detail with reference to the drawing. In this show:

Fig. 1

schematically a front view of a sewing machine with a winding device for winding a spool of a spool of thread;

Fig. 2

in perspective and increases the winding device of the sewing machine Fig. 1 ;

Fig. 3

a detailed view of components of the winding device including an engagement body for stopping a rotational movement of a spool of the winding device from the direction of view III in Fig. 2 ;

Fig. 4

a plan view of the winding device before the beginning of a winding operation and after clamping a aufzuspulenden thread under a tear-off;

Fig. 5

in one too Fig. 4 similar illustration, the winding device immediately after the beginning of the winding process;

Fig. 6

a top view of a section of the sewing machine after Fig. 1 from viewing direction VI in the Fig. 1 ;

Fig. 7

a section according to line VII-VII in Fig. 6 showing details of the drive of the winding device;

8 to 12 to Fig. 7

similar views of further instantaneous positions of the drive of the winding device during the winding process;

Fig. 13

in one too Fig. 2 similar representation of a further embodiment of a winding device;

Fig. 14

an enlarged detail of a hook of an engagement body of the winding device, engaged in a spool, in one to Fig. 7 similar representation for explaining another embodiment of the winding device;

Fig. 15

a longitudinal section through the winding device after the Fig. 1 to 13 in a section plane parallel to the drawing plane Fig. 6 ;

Fig. 16

a detail enlargement of the detail XVI in Fig. 15 ;

Fig. 17

in one too Fig. 16 a similar embodiment, a further embodiment of a winder shaft of the winding device; and

Fig. 18

in one too Fig. 16 a similar embodiment, a further embodiment of a winder shaft of the winding device.

A sewing machine 1 has a housing 2 with an arm 3 and a stand 4. A needle bar 5 is driven up and down with a sewing needle 6 via an arm shaft extending in the arm 3. A sewing thread is fed via a thread guiding device 7 with a predetermined thread tension.

The sewing machine 1 has a winding device 8 for winding a yarn package from a yarn roll 9. A aufzuspulender thread 10 is thereby fed via a boom 11 and yarn guide components of the yarn guide device 7 of the winding device 8.

FIGS. 2 and 3 show a details of the winding device 8. A friction wheel 12 of the winding device 8 is for driving the winding device 8 driven by the arm shaft of the sewing machine 1, as will be explained. The friction wheel 12 is formed by an O-ring which is mounted on a spool 13. The spool wheel 13 is made of plastic, such as polyurethane, and is designed as an injection molded part.

An engaging body 14, at the free end of a hook 15 is formed in the in Fig. 2 shown instantaneous position of the winding device 8 is engaged in a receptacle 16 of the spool wheel 13, which thus represents a receiving body for the Einrückkörper 14. In the in the Fig. 2 shown engagement position of the Einrückkörpers 14 in the receptacle 16, the rotational movement of the spool gear 13 with the friction wheel 12 and thus a winding movement of the winding device 8 is stopped.

The engagement body 14 is elastically damped in the engagement position via a damping element 17 on the receiving body 13. The damping element 17 is made of an elastomer and is engaged via a locking foot 18 in a complementary thereto detent receiving the Spulenrades 13 and thereby positively connected thereto. The damping element 17 creates when braking the spool 13 via the engaged hook 15 a delay path, which is formed by a compression of the damping element 17 during braking of the spool wheel 13. This deceleration path leads to a reduction of the deceleration the winding device 8 during braking and thus to a reduced load on the end of the winding process.

The engagement body 14 is rigidly connected to a reversing body 19, which has a switching cam with a switching edge 20. Rigid with the Einrückkörper 14 and the Umstellkörper 19 is connected to a trigger lever 21 with a coil-driver surface 22 which rests during winding on a jacket wall of the wound bobbin. The engagement body 14, the changeover body 19 and the release lever 21 are pivotable about a common pivot axis 23 which is parallel to a winding axis 25 of the winding device 8 predetermined by a winder shaft 24.

On an outer peripheral wall of the control cam 19 is a free leg of a leaf spring 26 at. An opposite end of the leaf spring 26 is fixed via a return spring 27 to a housing-fixed support body 28 of the winding device 8.

A coil receptacle 29 extending in the circumferential direction around the winder shaft 24 rotatably lies in the support body 28. In a circumferential position of the coil receptacle 29, a tear-off blade 30 is arranged for clamping the thread 10 to be wound up. On the winder shaft 24, a coil housing 31 is placed in the coils. The coil housing 31 is attached to the winder shaft 24.

4 and 5 illustrate the beginning of the winding process. Fig. 4 shows the rotational position of the coil holder 29 with switched-off bobbin 8, ie before the beginning of the winding process. The aufzuzuspulende on the winder shaft 24 thread 10 is already cut to length with the Abreißmesser 30 and clamped against the coil holder 29, so that the thread 10 at the beginning of rewinding. Fig. 5 shows the beginning of the winding process, in which the coil holder 29 has performed about one-fifth of a full turn clockwise.

Fig. 6 shows details for driving the winding device 8. The friction wheel 12 acts for this purpose with an end wall 32 of a toothed belt wheel 33 together, which is part of a belt drive of the sewing machine 1. The toothed belt wheel 33 is rotatably connected to the arm shaft 34 of the sewing machine 1.

Fig. 7 to 12 show in a momentary position sequence the drive of the winding device 8 during the winding process.

Fig. 7 shows the switched-off winding device 8 before the start of the winding process, ie in the position which also in the Fig. 4 is shown. The hook 15 of the Einrückkörpers 14 lies over the damping element 17 in the receptacle 16 of the spool wheel 13 in the position Fig. 7 the winding device 8 can not be rotated about the winding axis 25, as this is prevented by the engaged hook 15. Of the Fig. 7 Also, the storage of the leaf spring 26 can be seen on a connected to the winder shaft 24 bearing body 35. The bearing body 35 is in turn connected to the spool wheel 13. In the off position after the Fig. 4 and 7 pulls the return spring 27, the spool 13 and thus the friction wheel 12 away from the end wall 32 of the timing pulley 33 so that the friction wheel 12 spaced from the timing pulley 33 and thus is not in frictional engagement therewith. The winding device 8 is therefore not driven.

Fig. 8 shows a switched-on position of the winding device 8. The winding device 8 is switched by pivoting the release lever 21 about the pivot axis 23 such that the hook 15 of the Einrückkörpers 14th from the receptacle 16 disengages, so that the spool 13 is released from the Einrückkörper 14. By this pivoting movement, the leaf spring 26 by the switching cam of the Umstellkörpers 19 in the Fig. 8 shifted to the top right, so that the leaf spring 26 via the bearing body 35, the spool 13 in the Fig. 8 displaced against the bias of the return spring 27 to the right until the friction wheel 12 comes to rest on the end wall 32 of the toothed belt wheel 33 until the winding device 8 can be driven for winding about the winding axis 25 via the arm shaft 34.

Now, the thread 10 is wound in the coil housing 31. In this case, the coil driver surface 22 of the release lever 21 is in contact with the outer jacket wall of the coil formed by the thread 10. The release lever 21 is characterized by the growing coiled coil so in the sequence of Fig. 8 to 9 always pivoted clockwise about the pivot axis 23. At the same time pivoting due to the rigid connection and the reversing body 19 and the Einrückkörper 14, as in the Fig. 8 ff. represented.

Fig. 9 shows an instantaneous position at which the bobbin has practically reached its nominal strength. The free end of the leaf spring 26 is applied to the switching cam of the Umstellkörpers 19 practically on the switching edge 20.

Fig. 10 shows a further instantaneous position during the turn-off of the winding device 8. The free end of the leaf spring 26 is displaced over the switching edge 20 of the reversing body 19 away. The leaf spring 26 can thereby relax, so that the tensile force of the return spring 27 in relation to this opposing clamping force of the leaf spring 26 begins to get stronger. The leaf spring 26 presses with its free end against the reversing body 19, so that the pivoting movement of the Umstellkörpers 19 and thus also the Einrückkörpers 14 in the Fig. 7 to 12 continues in a clockwise direction.

Fig. 11 shows a momentary position of the winding device 8 just before the hook 15 engages in the receptacle 16 of the spool wheel 13. The hook 15 is guided by a spiral guide wall 36 of the spool wheel 13. This ensures that the friction wheel 12 is still in frictional connection with the toothed belt wheel 33 until shortly before the end of the winding process.

Fig. 12 shows the end of the turn-off, so the position of the winding device 8, which, as regards their drive, the position after Fig. 7 equivalent. The only difference is that in the current position after Fig. 12 on the winding device 8 a ready-wound coil in the coil housing 31 is present.

The damping element 17 leads at the transition between the instantaneous positions after Fig. 11 and 12 This leads to a corresponding braking distance, which provides the damping element 17, reduced braking acceleration of the spool wheel 13 and thus to a correspondingly reduced load on the components of the winding device. 8

Fig. 13 shows a further variant of a winding device 8. Components that correspond to those described above with reference to the Fig. 1 to 12 have the same reference numbers and will not be discussed again in detail.

In the execution after Fig. 13 are the Einrückkörper 14 and the Umstellkörper 19 not, as in the embodiment of the Fig. 1 to 12 the case is, integrated within a component, so integrally connected to each other, but represent two separately mounted on a pivot shaft 37 components. The engaging body 14 can be adjusted relative to the Umstellkörper 19 in the circumferential direction about the pivot axis 23 in this case. In contrast, in the embodiment of the winding device 8 after the Fig. 1 to 12 the engagement body 14 and the changeover body 19 are set together as sections of one and the same component in the circumferential direction about the pivot axis 23.

Fig. 14 shows in one too Fig. 7 a similar representation, an enlarged detail of the engaged in the receptacle 16 of the spool 13 hook 15 a variant of the Einrückkörpers 14. Dashed lines is indicated in the Fig. 14 a limitation of a damping layer 38, which is applied to the spool wheel 13, that is on the receiving body, in the region of the receptacle 16. The damping layer 38 replaces the damping element 17.

Alternatively or additionally, a corresponding damping layer 39 may also be applied to the hook 15, as in FIG Fig. 14 also indicated by dashed lines. The selection of the thicknesses of the damping layers 38 and 39 and the choice of material is dependent on the requirements that are placed on a reduction of the acceleration forces during braking of the spool wheel 13 of the winding device 8.

The damping element 17 or the damping layers 38, 39 may be made of an elastomer, an elastomeric foam or rubber. The damping element 17 can also be used as a resilient element, for example as a leaf spring, be formed. A plastic design of such a resilient element is possible. Finally, the spool wheel 13 may be provided in total from a correspondingly damping or resilient material, so that the damping element is designed with the spool as a one-piece component. Such a one-piece design of the spool wheel 13, which also has the function of the damping element is in the Fig. 12 indicated.

FIGS. 15 and 16 show two in the installed state of the winding device 8 horizontal longitudinal sections through the winding device 8 in the embodiment of the Fig. 1 to 13 with an expandable winder shaft. The winder shaft 24 is hollow with an internal cavity and has a longitudinal slot 40 extending along the winder shaft 24. An inner wall of the hollow winder shaft 24 is designed as an internal thread 41.

The internal thread 41 is designed as a blind thread. At a bag portion 42 of the internal thread 41 is followed by a transverse through the winder shaft 24 bore 43 at. The longitudinal slot 40 extends from a free end 44 of the winder shaft 24 up to the level of the bore 43. The bore 43 reduces the wall thickness of the slotted winder shaft 24, so that it can be bent or spread in the slotted area.

The bag section 42 simultaneously constitutes a threaded section of the internal thread 41, which tapers conically with respect to the bore 43. The internal thread diameter of the internal thread 41 thus decreases as the distance to the free end 44 of the winder shaft 24 increases.

At the conically tapered threaded portion 42 is followed by a parallel threaded portion 45 of the internal thread 41, in which the internal thread diameter does not change to the free end 44 out.

The winder shaft 24 has a screw-46, which is stirred as a threaded pin. The screw-in 46 has an external thread 47 which is complementary to the internal thread 41 in the parallel threaded portion 45, that is complementary to this internal thread section with maximum internal thread diameter is executed.

Toward the free end 44, the screw-in body 46 has a contoured recess 48 into which a screwing tool can engage.

With the help of the Einschraubkörpers 46, the outer diameter of the winder shaft 24 can be adapted to adapt to an inner diameter of a corresponding receptacle of the bobbin case 31 sensitively, so that the plugged onto the winder shaft 24 coil is on the one hand safely taken by the spinning bobbin winding shaft 24 on the one hand, on the other hand it is ensured that the coil housing 31 can be easily attached to the winder shaft 24. By adjusting the outer diameter of the winder shaft 24, therefore, the frictional engagement of the bobbin case 31 with the winder shaft 24 can be adjusted. The procedure is as follows:

As long as the screw-in body 46 is screwed in exclusively in the parallel threaded portion 45 of the internal thread 41, the winder shaft 24 has a minimum outside diameter, in which it is ensured in each case that the coil housing 31 can be easily attached to the winder shaft 24. As a rule, at this minimum outer diameter of the Bobbin winder shaft 24 a frictional engagement between this and the plugged-coil housing 31 for safe entrainment of the bobbin case 31 is still too low. Now, the screw-in body 46 is screwed in an iterative process into the conically tapered threaded portion 42, wherein the screwing tool is guided from the free end of the winder shaft 24 forth through the hollow winder shaft 24 to the recess 48.

With each screwing of the screw-46 in the conically tapered threaded portion 42 of the screw 46 pushes the walls that form the winder shaft 24, a piece further apart, so that the outer diameter of the winder shaft 24 each increases by an increment. For this purpose, the longitudinal slot 40 widens toward the free end 44 of the winder shaft 24. After each incremental screwing the Einschraubkörpers 46 in the tapered threaded portion 42 is tested whether the frictional engagement between the then plugged-coil housing 31 and the winder shaft 24 sufficient to safely take the bobbin case 31. The screwing of the screw 46 is terminated when this condition is met.

The conically tapering threaded portion 42 may be formed by a gate portion of a tap cutting the parallel thread portion 45. This represents a very cost-effective variant for producing the conically tapered threaded portion 42.

FIGS. 17 and 18 show two further embodiments of an expandable winder shaft 24th

In the execution after Fig. 17 is in place of the conically tapered threaded portion 42, a conically tapered cavity portion 49 is provided. This taper cavity portion 49 is located between the parallel threaded portion 45 and the sac cavity portion 43. In the embodiment of Fig. 17 the screw-in body 46 has a guide section 50, which tapers in the screwed-in position of the screw-in body 46 toward the sac cavity section 43. The tapered cavity portion of the winder shaft 24 on the one hand and the guide portion 50 of the screw-46 on the other hand are designed without a thread. When screwing the screw 46 after Fig. 17 into the internal thread 41, the guide portion 50 comes into contact with the taper cavity portion 49 as soon as the screw-in body 46 is screwed in far enough. The guide portion 50 cooperates with further screwing the Einschraubkörpers 46 with the tapered cavity portion 49 and spreads the winder shaft 24 adjustable, so that its outer diameter corresponding to what above to execution according to the FIGS. 15 and 16 was executed, adjustable increased.

In the execution after Fig. 18 between the screw-46 and the taper cavity portion 49, a cylindrical elastomeric body 51 is arranged. The outer diameter of the elastomeric body 51 is slightly smaller than the inner diameter of the internal thread 41. The outer diameter of the elastomeric body 51 is greater than the tapered diameter of the tapered cavity portion 49. When screwing the Einschraubkörpers 46 in the embodiment of Fig. 18 this comes into contact with the elastomer body 51, wherein in a certain Einschraubstellung the Einschraubkörpers 46, the initially unbiased elastomeric body 51 between the screw 46th and the tapered cavity portion 49. Upon further screwing the Einschraubkörpers 46 into the internal thread 41 of the elastomeric body 51 is compressed in its dimension along the winder shaft 24. As a result, the elastomeric body 51 exerts a radial force on the winder shaft 24 surrounding it and thereby spreads it. The radial force exerted by the elastomer body 51 on the winder shaft 24 depends on the depth of engagement of the screw-in body 46, so that a fine adjustment of the spreading of the winder shaft 24 and thus of its outer diameter is provided. The function of execution after Fig. 18 therefore corresponds to that of the embodiments according to the FIGS. 15 to 17 ,

In an otherwise according to the execution Fig. 18 corresponding, not shown further embodiment, the cavity of the winder shaft 24 does not taper. Spreading of the winder shaft 24 then occurs solely by the radial force caused by a compression of the elastomer body 51 on the winder shaft 24 surrounding the elastomer body 51.

Claims (12)

1. Sewing machine (1) comprising

   - a stand (4);

   - an arm (3) with an arm shaft (34) which is drivably connected to a needle bar (5);

   - a driven winding device (8) for winding a spool off a reel of yarn (9);

   - with the winding device (8) comprising a winding shaft (24) for attachment of a spool housing (31);

   characterized in that the winding shaft (24) comprises:

   - an inner hollow space which comprises an internal thread (41);

   - a spreading screw-in body (46) having an external thread which is complementary to the internal thread (41) for adjusting an external diameter of the winding shaft (24).
2. Sewing machine according to claim 1, characterized in that the internal diameter of the inner hollow space of the winding shaft (24) reduces with increasing distance from the free end (44) of the winding shaft (24).
3. Sewing machine according to claim 2, characterized in that the internal thread diameter of the internal thread (41) reduces with increasing distance from the free end (44) of the winding shaft (24).
4. Sewing machine according to claim 3, characterized in that the internal thread (41) comprises a conically tapering threaded portion (42).
5. Sewing machine according to claim 4, characterized in that the conically tapering threaded portion (42) adjoins a parallel threaded portion (45) in which the internal thread diameter does not change.
6. Sewing machine according to one of claims 1 to 5, characterized in that the internal thread (41) is a blind thread, with a hollow space portion (43) of the winding shaft (24) adjoining a blind portion (42) of the internal thread (41), the hollow space portion (43) having an increased diameter in relation to the blind portion (42).
7. Sewing machine according to one of claims 1 to 6, characterized in that the screw-in body (46) is formed by a threaded pin.
8. Sewing machine according to one of claims 1 to 7, characterized in that the winding shaft (42) comprises at least one longitudinal slit (40).
9. Sewing machine according to one of claims 2 to 8, characterized in that the inner hollow space comprises a conically tapering hollow space portion (49).
10. Sewing machine according to claim 9, characterized in that the screw-in body (46) comprises a guide portion (50) which interacts with the tapering hollow space portion (49).
11. Sewing machine according to one of claims 1 to 10, characterized by an elastomeric body (51) between a blind portion (42) of the hollow space portion (49) and the screw-in body (46).
12. Winding device for a sewing machine according to one of claims 1 to 11.

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