EP1991730B1 - Thread winding housing for inserting into a housing receptacle of a gripper body, rotatable about a vertical axis, of a sewing machine - Google Patents

Abstract

A thread winding housing (25) serves for inserting into a housing receptacle of a gripper body (22), rotatable about a vertical axis, of a gripper (21) of a sewing machine. The thread winding housing (25) has a housing pot (33) for accommodating a thread winding with a thread (27). Serving to cover the thread winding is a housing cover (34). The latter has a first, bottom cover layer (36) with a central guide eye for the thread to pass through. A second, top cover layer (41) at least partly covers the first cover layer (36) in the region of a thread guide. A thread brake (65) interacts with a thread guide section (64). The housing cover (34) is pivotably linked to the housing pot (33) and is connected to the latter. This results in a thread winding housing which simplifies the insertion of the thread winding with good operational reliability and availability of the sewing machine.

Description

The invention relates to a thread winding housing according to the preamble of claim 1.

Such a filament winding housing is known from the DE-PS 614 062 , The insertion of the thread of this filament winding housing is very cumbersome. In addition, errors may occur during assembly of the filament winding housing following the insertion of the filament winding, which affect the availability of the sewing machine.

Further embodiments of housings having a supply of a suture, are known from the DE 25 40 994 A1 , of the JP 01-281270 A and the US 2,817,307 A ,

It is an object of the present invention to develop a filament winding housing of the type mentioned in such a way that the insertion of the filament winding is simplified with good reliability and availability of the sewing machine.

This object is achieved by a filament winding housing with the features specified in the characterizing part of claim 1.

A hinged on the housing pot hinged housing cover is in contrast to a separate component performing cover pot of the filament winding housing after the DE-PS 614 062 captive. In addition, by clearly defined with respect to its orientation to the housing pot Housing cover prevents incorrect and time-consuming composition of the filament winding housing after inserting the filament winding.
The two cover layers, between which the thread is guided, having housing cover ensures a secure cover of the filament winding housing, so that the entrained by the gripper body needle thread and provided by the filament winding lower thread can not interfere with each other.

An upper cover layer according to claim 2 leads to a further facilitation of the insertion process, since in particular during insertion of the thread into a yarn brake counterpressure of the usually without resistance can be removed from the thread winding thread removable.

A lower window cutout according to claim 3 allows a simple visual inspection of the thread supply still available thread supply.

A locking body according to claim 4 ensures a secure closure of the filament winding housing and thus a secure cover of the filament winding during operation of the sewing machine. As far as the locking body is arranged between the two cover layers, this leads to a compact construction of the lockable housing cover.

A backup of the positions of the locking body according to claim 5 facilitates the handling of the filament winding housing in addition and increases the reliability.

A slide button according to claim 6 is easily accessible. As far as the slide button has a rounded contour, an influence of the needle thread by the slide button is practically impossible.

A central Leitöse according to claim 7 ensures a simple removal of the thread from the filament winding during operation of the sewing machine with easy insertion of the thread winding. In this embodiment, threading of the lower thread is possible without this having to be threaded through an opening.

A circumferential recess according to claim 8 facilitates the insertion process, in particular in the moment in which the thread between the two cover layers of the housing cover is inserted.

A locking body according to claim 9 ensures that the once introduced into the Leitöse thread from this can no longer escape.

A pot insertion slot according to claim 10 allows a compact thread guide.

The arrangement of the yarn brake and the guide eye in the shell wall according to claim 11 provide a controlled trigger resistance of the lower thread with a compact design.

A pivot bearing arrangement according to claim 12 ensures that the thread gripped by the gripper is not pulled over the pivot bearing, so that the pivot bearing design can not affect the course of the detected thread.

Fig. 1

eine teilweise innere Details freigebende Vorderansicht einer Nähmaschine;

Fig. 2

perspektivisch und in lagerichtiger Darstellung eine Nähnadel, eine Stichplatte sowie einen Greiferkörper mit eingelegtem Fadenwickelgehäuse;

Fig. 3

den Greiferkörper mit dem Fadenwickelgehäuse in einer Explosionsdarstellung;

Fig. 4

eine perspektivische Ansicht des Fadenwickelgehäuses mit geschlossenem und verriegeltem Gehäusedeckel;

Fig. 5

eine zu Fig. 4 ähnliche Ansicht des Fadenwickelgehäuses mit geöffnetem und entriegeltem Deckel;

Fig. 6 bis 11

Momentaufnahmen beim Einlegen eines Fadenwickels in das Fadenwickelgehäuse sowie beim Einlegen des abzuwickelnden Fadens;

Fig. 12

eine weitere Momentaufnahme beim Einlegen des Fadens, wobei eine obere Deckellage des Gehäusedeckels sowie eine Feder einer Fadenbremse abgenommen sind;

Fig. 13

eine zu Fig. 12 ähnliche, um die obere Deckellage und die Feder der Fadenbremse ergänzte Ansicht; und

Fig. 14 bis 17

Ausschnittsvergrößerungen aus den Fig. 10 bis 13.

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

Fig. 1

a partially internal detail releasing front view of a sewing machine;

Fig. 2

perspective and in the correct position representation of a sewing needle, a throat plate and a gripper body with pickled filament winding housing;

Fig. 3

the gripper body with the filament winding housing in an exploded view;

Fig. 4

a perspective view of the filament winding housing with closed and locked housing cover;

Fig. 5

one too Fig. 4 similar view of the filament winding housing with the lid open and unlocked;

Fig. 6 to 11

Snapshots when inserting a thread winding in the filament winding housing and when inserting the unwinding thread;

Fig. 12

a further snapshot when inserting the thread, wherein an upper cover layer of the housing cover and a spring of a yarn brake are removed;

Fig. 13

one too Fig. 12 similar to the top cover layer and the spring of the thread brake supplemented view; and

FIGS. 14 to 17

Extensions enlargements from the Fig. 10 to 13 ,

A sewing machine 1 has a base plate 2 with a stand 3 extending upwardly therefrom and an angled arm 4. The latter ends in a head 5. In the arm 4, an arm shaft 6 is rotatably mounted, which drives a crank mechanism 7 with a thread lever 8 in the head 5. The crank drive 7 is drivingly connected to a displaceably mounted in the head 5 needle bar 9 in conjunction. The latter has a sewing needle 10 at its lower end. The sewing needle 10 can be moved up and down by the crank mechanism 7. In this case, the sewing needle 10 passes through a movement space. The sewing needle 10 leads in an eye from a spool 12 via a thread tensioning device and the thread lever 8 supplied needle thread 13th

On the base plate 2 is one with screws, which are guided by screw holes 14, 15, a support plate 16 is mounted on which a workpiece 17 rests. The support plate 16 has a feed gate 18, which is designed for the passage of a feed dog 19. The feed dog 19 has a in the Fig. 1 illustrated needle hole 20 for the passage of the sewing needle 10. The feed dog 19 is driven by a arranged below the base plate 2 thrust and lifting gear.

Below the support plate 16, a gripper 21 is arranged, which has a gripper body 22 with a hook tip 23. In a cup-shaped housing receptacle 24 of the gripper body 22, a thread winding housing 25 is rotatably mounted, in which a thread supply is received in the form of a thread winding 26. For storing storage of the filament winding housing 25 of the gripper body 22 has a circumferential groove in the bearing clearance with a bearing rib the filament winding housing 25 is received. The filament winding 26 is also referred to as a bobbin. The filament winding 26 provides a lower thread 27 ready. This runs from the thread winding 26 to an outlet opening 28 on a thread path, which will be described in detail below. From the outlet opening 28, the lower or looper thread 27 extends through the needle hole 20 and the opening 18 therethrough.

The gripper body 22 is fixedly connected to a shaft having a vertical axis 29 extending parallel to the needle bar 9. This shaft is rotatably mounted in a bearing block 30 screwed to the base plate 2. In this, a drive shaft 31 is also mounted, which is connected to a arranged in the interior of the bearing block 30 gear transmission. The drive shaft 31 is drivingly connected to the arm shaft 6 via a belt drive 32.

Furthermore, the filament winding housing 25 has a housing cover 34 for covering the filament winding 26. The articulated connection 35, which defines a pivot bearing with a horizontal pivot axis, the housing cover 34 is pivotable on the housing pot 33 between a Closing or working position in the Fig. 4 is shown and a thread winding insertion adjustment, in the Fig. 5 is shown, pivotally. The housing cover 34 has a first, lower cover layer 36. This has for the passage of the lower thread 27 on a central Leitöse 37. The central lead eyelet 37 is formed at the end of a lid insertion slot 39 open at an outer edge 38 of the lower lid layer 36. The lid insertion slot 39 does not open straight into the Leitöse 37, but over a curved slot end portion 40th

In the region of a guide of the lower thread 27, the first cover layer 36 is partially covered by a second, upper cover layer 41. The upper cover layer 41 has in the region of the guide of the lower thread 27 an upper approximately oval window opening 42. The inserted lower thread 27 runs under the upper Cover layer 41 parallel to this under the window opening 42, so that the lower thread 27 is freely accessible in a section through the window opening 42 from above. From above, therefore, pressure can be exerted on this thread section, z. B. by a finger is placed on this thread section in the region of the window opening 42. The lower cover layer 36 has a lower window cutout 43, which is aligned with the window cutout 42 of the upper cover layer 41. Through the two window cutouts 42, 43, therefore, a view from the outside of the interior of the filament winding housing 25 is possible, so that the thread supply can be controlled. The upper lid layer 41 has a sector-shaped circumferential recess 44 which partially overlaps with the lid insertion slot 39.

Between the two cover layers 36, 41, a flat locking body 45 is arranged. The latter can be linear between a retracted open position, the Fig. 5 is shown and in which the housing cover 34 can be pivoted relative to the housing pot 33, and in a locking position, in the Fig. 4 is shown and in which the housing cover 34 is locked in the working position, displaced. A first linear guide of the displacement of the locking body 45 between the open and the locking position is given by a screwed from above through a slot 46 in the upper lid position 41 in the locking body 45 guide screw 47. Another linear guide is given by a top through another slot 48 in the upper lid position 41 with the locking body 45 riveted slide button 49. The latter points upwards, ie to its free side towards, a rounded outline. By means of the slide button 49, the locking body 45 can be actuated, that is to be displaced between the open position and the locked position.

The locking body 45 is secured by means of a spring steel spring made of spring steel 50 on the one hand in the open position and on the other hand in the locked position. For this purpose, the locking body 45 has two locking grooves 51, 52, in which a free end 53 of the locking spring 50 selectively engages. The securing spring 50 is contour-adapted to a flat spacer body 54, which is arranged at the level of the locking body 45 between the two cover layers 36, 41. The spacer body 54 also serves as a spacer between the cover layers 36, 41. The lower cover layer 36 and the spacer body 54 have mutually aligned webs 55, 56 which are movably received in mounted housing cover 34 in a formed on the housing pot 33 U-shaped groove. The webs 55, 56 at the same time constitute parts of the articulated connection 35. The locking body 45 is arranged and shaped relative to the lower cover layer 36 such that the guide eyelet 37 is closed by the latter in the open or locked position of the locking body 45.

The hinge connection 35 is covered by an upper-side hinge plate 58. The latter is screwed by means of screws 59 on the edge of the housing pot 33.

In the locking position of the locking body 45 engages a leading edge 60 of this in a complementarily shaped groove 61 in an inner jacket wall 62 of the housing pot 33 a.

In the housing pot 33, an obliquely extending pot insertion slot 63 is formed, which releases a thread passage from the plane of the housing cover 34 toward an outer jacket wall 64 of the housing pot 33. This course of the pot insertion slot 63 is the Fig. 16 easily removable, in which the thread winding housing 25 is shown without the upper lid position 41 and without a thread brake 65 to be described. The thread exit from the jacket wall 64 is formed by a guide eye 66 which is formed at the end of the pot insertion slot 63. The guide eye 66 forms together with the jacket wall 64 in the region of the thread brake 65 a thread guide section.

The yarn brake 65 is formed as on the jacket wall 64 in the circumferential direction fitting leaf spring. As Fig. 15 shows, the yarn brake 65 is arranged such that it clamps the exiting from the casing wall 64 by the guide eye 66 lower thread 27 against the casing wall 64 in sections. The yarn brake 65 ensures a controlled tension of the otherwise without resistance peelable from the thread winding 26 lower thread 27th

• Zunächst liegt das Fadenwickelgehäuse 25 in der in Fig. 5 dargestellten Einlegeposition vor. Sodann wird, wie in den Fig. 6 und 7 dargestellt, der Fadenwickel 26 in den Gehäusetopf 33 eingesetzt. Das vom Fadenwickel 26 zentral abstehende freie Ende des Unterfadens 27 wird sodann von der Außenkante 38 her durch den Deckel-Einführschlitz 39 über den Schlitz-Endabschnitt 40 in die Leitöse 37 eingeführt. Der die Leitöse 37 verschließende Verriegelungskörper 45 sorgt anschließend dafür, dass der einmal in die Leitöse 37 eingeführte Unterfaden 27 aus dieser nicht mehr entkommen kann. Anschließend wird der Unterfaden 27 im Bereich der Umfangsaussparung 44 um die untere Deckellage 36 herumgeführt und zwischen die beiden Deckellagen 36, 41 eingeführt. Diesen letzten Einführvorgang erleichtert eine halbmondförmige Aussparung 67 in der Außenkante 38 der unteren Deckellage 36. Zwischen den Deckellagen 36, 41 läuft der Unterfaden 27 in einem Zwischenraum, der durch die Stärke des Distanzkörpers 54 vorgegeben ist. Der Unterfaden 27 wird sodann in Richtung auf die Gelenkverbindung 35 gezogen, bis die Zwischenstellung nach Fig. 9 erreicht ist. Anschließend wird der Gehäusedeckel 34 geschlossen und mit dem Verriegelungskörper 45 gesichert. Dabei wird der Unterfaden 27 durch den Topf-Einführschlitz 63 geführt. Damit der Unterfaden 27 die Führungsöse 66 erreicht, muss er zwischen der Fadenbremse 65 und der Mantelwand 64 hindurch gezogen werden. Hierbei wird vom Benutzer mit dem Finger auf den Fadenabschnitt, der durch die Fensterabschnitte 42, 43 von oben her zugänglich ist, Druck auf diesen Fadenabschnitt ausgeübt, sodass dieser Fadenabschnitt zwischen dem Benutzerfinger und dem Fadenwickel 26 festgehalten ist. Dann kann der Unterfaden 27 zwischen die Mantelwand 64 und die Fadenbremse 65 eingezogen werden, bis er in der Führungsöse 66 zu liegen kommt. Von dort wird der Unterfaden 27 weiter zu der am oberen Rand des Gehäusetopfs 33 befindlichen Austrittsöffnung 28 gefädelt und hochgezogen. Nach dem Einfädel-Vorgang hängt das freie Ende von etwa 2 cm aus der Austrittsöffnung 28 heraus.

The insertion of the thread winding 26 and the threading of the lower thread 27 in the thread winding housing 25 are as follows:

• First, the thread winding housing 25 is in the in Fig. 5 presented insertion position. Then, as in the 6 and 7 shown, the thread winding 26 inserted into the housing pot 33. The centrally extending from the thread winding 26 free end of the lower thread 27 is then introduced from the outer edge 38 forth through the lid insertion slot 39 via the slot end portion 40 in the Leitöse 37. The Leitöse 37 closing locking body 45 then ensures that the once in the Leitöse 37 imported bobbin thread 27 from this can no longer escape. Subsequently, the lower thread 27 is guided around the lower cover layer 36 in the region of the circumferential recess 44 and inserted between the two cover layers 36, 41. This last insertion process facilitates a crescent-shaped recess 67 in the outer edge 38 of the lower cover layer 36. Between the cover layers 36, 41, the lower thread 27 runs in an intermediate space which is predetermined by the thickness of the spacer 54. The lower thread 27 is then pulled in the direction of the hinge connection 35 until the intermediate position after Fig. 9 is reached. Subsequently, the housing cover 34 is closed and secured with the locking body 45. In this case, the lower thread 27 is guided through the pot insertion slot 63. So that the lower thread 27 reaches the guide eye 66, it must be pulled between the thread brake 65 and the jacket wall 64 therethrough. Here, by the user with his finger on the thread portion, which is accessible through the window sections 42, 43 from above, exerted pressure on this thread section, so that this thread section between the user's finger and the thread winding 26 is held. Then, the lower thread 27 can be drawn between the casing wall 64 and the thread brake 65 until it comes to rest in the guide eye 66. From there, the lower thread 27 is further threaded to the located at the top of the housing pot 33 outlet opening 28 and pulled up. After the threading process, the free end of about 2 cm hangs out of the outlet opening 28.

The gripper body 22 with the rapier tip 23 rotates clockwise during sewing operation of the sewing machine 1 as viewed from above, while the filament winding housing 25 is held non-rotatably by the engagement of a holding finger formed therein in a groove formed on the underside of the platen 16, as in FIG Fig. 2 shown. It captures the Hook tip 23, the needle thread 13 in the area below the stitch hole 20 and takes there during about half a turn around the filament winding housing 25 a loop of the needle thread 13. In the Fig. 1 The viewer's side facing away from the gripper 21 is therefore referred to as loop receiving side 68.

After about half a revolution, the hook tip 23 releases the received needle thread loop. The viewer in Fig. 1 facing side of the gripper 21 is therefore referred to as Schleifenabwurfseite 69.

The articulated connection 35 is arranged adjacent to the loop discharge side 69 of the gripper 21 when the filament winding housing 25 is inserted in the gripper body 22.

With the progressive rotation of the arm shaft 6, the retraction of the released needle thread loop takes place by the action of the now upwardly moving thread lever 8. In this case, the free end of hanging out of the filament winding housing 25 portion of the lower thread 27 is detected and through the stitch hole 20 to form a knot in pulled up the fabric 17.

Claims (12)

1. Bobbin housing (25) for use in a housing receptacle (24) of a hook body (22), which is rotatable about a vertical axis (29), of a hook (21) of a sewing machine (1), the bobbin housing (25) comprising:

   - a housing pot (23) for receiving a bobbin (26) with a thread (27);

   - a housing lid (34) for covering the bobbin (26);

   - wherein the housing lid (34) comprises

   -- a first, lower lid layer (36) with a central guide eye (37) for a thread (27) to pass through;

   -- a second, upper lid layer (41) which at least partly covers the first lid layer (36) in the region of a thread guide;

   - a thread brake (65) cooperating with a thread guide portion (66, 64);

   characterized in that the housing lid (34) is pivotally articulated to the housing pot (33) and is connected therewith.
2. Bobbin housing according to claim 1, characterized in that in the region of the thread guide, the upper lid layer (41) is provided with an upper window section (42) through which pressure can be exerted on the thread (27) from above.
3. Bobbin housing according to claim 2, characterized in that the lower lid layer (36) is provided with a lower window section (43), wherein the two window sections (42, 43) are aligned with each other while allowing the inside of the bobbin housing (25) to be seen from outside.
4. Bobbin housing according to one of claims 1 to 3, characterized by a latching body (45) which is advantageously arranged between the two lid layers (36, 41), the latching body (45) being pivotal between an open position in which the housing lid (34) is pivotal relative to the housing pot (33) and a latched position in which the housing lid (34) is latched in a closed position.
5. Bobbin housing according to claim 4, characterized in that the latching body (45) is secured by means of a retaining spring (50) in the open position on the one hand and in the latched position on the other, wherein the latching body (45) in particular comprises two retaining grooves (51, 52) which are optionally engaged by the retaining spring (50).
6. Bobbin housing according to claim 4 or 5, characterized in that the latching body (45) is operable by way of a slider button (49) arranged on the upper lid layer (41), the slider button (49) advantageously having a rounded contour.
7. Bobbin housing according to one of claims 1 to 6, characterized in that the central guide eye (37) is formed at the end of a lid insertion slot (39) which is open at the end of an outer edge (38) of the lower lid layer (38).
8. Bobbin housing according to claim 7, characterized in that in the upper lid layer (41) is formed a circumferential recess (44) which partly overlaps with the lid insertion slot (39).
9. Bobbin housing according to claim 7 or 8 with reference to claims 4 to 6, characterized in that the guide eye (37) is closed by the latching body (45) when in the latched position.
10. Bobbin housing according to one of claims 1 to 9, characterized by a pot insertion slot (63) in the housing pot (33), the pot insertion slot (63) releasing a passage of the thread (27) from the lid level towards an outer cover wall (64) of the housing pot (33).
11. Bobbin housing according to claim 10, characterized in that the thread brake (65) is arranged such that it clamps a part of the thread (27) exiting the cover wall (64) against the cover wall (64), wherein the thread exit from the cover wall (64) is formed by a guide eye (66) which is formed at the end of the pot insertion slot (63).
12. Bobbin housing according to one of claims 1 to 11, characterized in that a pivot bearing (35), by means of which the housing lid (34) is articulated to the housing pot (33), is oriented on the bobbin housing (25) such that when the bobbin housing (25) is inserted in the hook body (22), the pivot bearing (35) is arranged near a loop release side (69) of the hook (21).

Images