KR20140064626A - Sewing machine - Google Patents

Abstract

A sewing machine includes a housing (2) and a stitch forming tool (10) for forming a seam, wherein the stitch forming tool includes a needle bar (9) maintaining a sewing needle (10). A thread lever (34) of the sewing machine guides an upper thread (28), and is synchronously operated with respect to the stitch forming tool (10) to be displaced between a top dead center and a bottom dead center. The sewing machine has upper thread guiding components (33, 35) disposed at the front and rear of the thread lever (34) at a passage of the upper thread. A thread passage pre-setting device (47) affects the length of the passage of the upper thread between an upstream upper thread guiding component (33) and the thread lever (34). The thread passage pre-setting device (47) has a protrusion element (48). The protrusion element (48) is disposed such that the upper thread (28) departs from a main guiding surface between the upstream upper thread guiding component (33) and the thread lever (34) and passes by. The main upper guiding surface is defined by the upstream upper thread guiding component (33), the thread lever (34), and a downstream upper thread guiding component (35). As a result, an improved thread passage pre-setting device may be obtained.

Description

[0001] SEWING MACHINE [0002]

The contents of German Patent Application DE 10 2012 221 060.1 are incorporated herein by reference.

According to the present invention,

- housing,

A stitch forming tool for forming a seam and including a needle bar for holding the sewing needle 10,

- a thread lever that guides the upper thread and is driven synchronously with the stitch forming tool so that it can be displaced between the upper and lower dead points;

- Upper upper thread guide part in front of the thread lever in the upper thread path,

- a downstream upper thread guide part following the thread lever in the upper thread path, and

And a thread path presetting device for influencing the length of the upper thread path between the upper thread guide part and the thread lever.

This kind of sewing machine is known in the conventional popular use. Here, the yarn path presetting device is formed of an adjustable yarn loop on the main thread guide surface. Especially when sewing to a thick or flat upper thread or an upper thread with a tendency to twist, a known thread path presetting device needs improvement.

Therefore, an object of the present invention is to improve a thread path presetting device of a sewing machine which is located before a thread lever in an upper thread path.

This object is achieved by a sewing machine according to the present invention, wherein in the present sewing machine, the thread path presetting device has at least one protruding element, the upper thread located between the upper- And is disposed so as to pass over the guide thread guide surface defined by the guide part, the thread lever, and the downstream thread guide part.

According to the present invention, it has been confirmed that the length of the upper thread path can be influenced not only in the guide thread guide surface but also in a direction perpendicular to the guide thread guide surface. The protruding elements of the thread path presetting device provide this kind of effect. So that the upper thread can be guided in a controlled manner in the path, and in the case of a sewing thread that is difficult to sew, the path is also guided at appropriate intervals from other sewing machine parts. Undesirable loop formation that can cause disturbance of yarn progression is effectively avoided. The thread path presetting device may be disposed adjacent to the motion path of the seal lever. This can increase the effectiveness of the real path preselection device. A plurality of protruding elements can also be disposed at various positions of the upper thread path. And at least one other projecting element may be arranged next to the thread lever in the upper thread path, in particular adjacent to the thread lever.

The displaceable protruding element may be adapted to a preset value for the loose seal area of the upper thread so that the protruding element is displaceable with respect to the housing in order to preset the upper thread path length between the upper thread guide and the thread lever .

 It has been found particularly advantageous to design the protruding element in an arcuate shape, the protruding element being a bracket which extends across the thread advancement of the upper thread between the upper thread guide and the thread lever. The protruding element can be manufactured economically.

Alternatively, at least one protruding element can be constituted by a solid or hollow body, in particular a web, formed in the housing.

Due to the convexity of the bracket or the arcuate body, controlled protrusion can occur. The convex portion of the arcuate body can be constructed particularly simply as a round bend.

The design in which the two ends of the bracket are fixed to the housing is stable.

In a configuration in which the bracket is adjustable at at least one end, the protrusion of the thread path presetting device and the length of the upper thread path between the upstream upper thread guide and the thread lever can be adjusted, in particular, by the end side adjustability.

It has been found that the latching indicator is particularly suited for the reliable adjustment of various protrusion values, said brackets having at least two latching indicators which, in each case in cooperation with the phase change fixed to the housing, Lt; RTI ID = 0.0 > of the < / RTI > Depending on the configuration of the bracket or the arcuate body, there may be three or more latching display portions.

And a latching display unit including a latching groove formed at an adjustable end of the bracket is simple.

The thread path presetting device and the two upper thread guide parts are held by a common support plate fixed to the housing so that the various functional parts can be advantageously integrated into a common carrier and thus the fabrication and / This is simplified.

BRIEF DESCRIPTION OF THE DRAWINGS One embodiment of the present invention will be described in more detail below with the aid of the drawings.

1 shows a perspective view of a sewing machine for sewing a heavy or tough sewing material as seen from the side of the operator, and internal details of the machine tool are also partially shown.
Fig. 2 shows a side detail view of the sewing machine according to Fig. 1 in the region of the sewing head at the end of the arm of the sewing machine.
Fig. 3 shows a disconnected section along line III-III in Fig.
Fig. 4 shows a thread path presetting device (in the form of a wire-like body) of the sewing machine in a similar manner to Fig. 3, at another relative position of the arc end with respect to the housing of the sewing machine as compared to the position according to Fig. 3 .
Figures 5-9 show a perspective view of the sewing machine head at various arm axis positions to illustrate the function of the thread path presetting device.

The sewing machine 1 has an upper arm 2, a vertical stand 3 and a lower housing (generally called a bed plate 4). The sewing machine 1 is designed to sew heavy or tough sewing materials (e.g., leather or plastic panels). The parts (2, 3, 4) forming the housing of the sewing machine are shown in Fig. 3 only for their outline.

In the arm 2, an arm shaft 5 is rotatably mounted on a frame 5a (schematically shown in Fig. 1). One of these arm shaft bearings is arranged in the region of the arm shaft end on the stand side and the other arm shaft bearing is arranged in the region of the opposite arm shaft end in the head 6 of the sewing machine 1. The driving of the arm shaft 5 and thus also of the important sewing parts of the sewing machine 1 takes place by the high-output motor 7 schematically shown in Fig. The needle bar 9 mounted in the vertical direction inside the head 6 is driven by the arm shaft 5 and the crank driver 8 to move vertically up and down and the needle 10 I have.

A barrel shuttle 11 is driven to oscillate back and forth around the shuttle oscillation axis 12 of the shuttle oscillation shaft 13 in the bed plate 4 below the needle bar 9. [ The barrel shuttle 11 is also referred to as a barrel looper. The shuttle oscillation axis 12 is parallel to the arm axis 5 in the horizontal direction. The barrel shuttle 11 cooperates with the sewing needle 10 to form a stitch and a seam on the sewing material. The barrel shuttle 11 and the sewing needle 10 are the stitch forming tools of the sewing machine 1. Other types of shuttles can be used instead of barrel shuttles.

The oscillation drive of the barrel shuttle 11 is caused by the shuttle driver 14. [ The shuttle driver 14 has a drive unit 15 for generating a transfer oscillating motion around the transfer oscillating axis 17. [

The transmission oscillation axis 17 is parallel to the axes 5 and 13.

The arm shaft 5 is used as a peripheral drive shaft of the drive unit 15. Further, the drive unit 15 has a connecting rod 18. One rod end of the connecting rod 18 is a rod hole 19 which is drive-connected to the driving shaft 5 by an eccentric unit. The other rod end of the connecting rod 18 is also a rod hole and is communicated to the transmission wheel 22 by an axial / radial bearing 23. [ The transmission wheel 22 is mounted on the bearing bush 23a so as to be pivotable about the transmission oscillation axis 17.

The connection rod 18 is connected to the transmission wheel 22 to rotate the transmission wheel back and forth around the transmission vibration axis 17. [

The pulling mechanism 25 of the pulling mechanism gear 26 of the shuttle driver 14 is guided on the outer periphery of the transfer wheel 22. [ The traction mechanism 25 is a toothed belt. The toothed belt is engaged with an outer tooth system on the outer circumference of the transmission wheel 22.

The traction mechanism gear 26 is used to convert the transmitted oscillating motion of the transfer wheel 22 around the transfer oscillating axis 17 into a drive oscillating motion of the shuttle oscillating shaft 13. [

The shuttle body of the barrel shuttle 11 moves synchronously with the needle 10 and catches an upper thread loop (which is guided through the sewing thread with the needle 10) to form a knot for the formation of stitches and seams, During the movement of the shuttle body, the upper thread is guided around the shuttle housing to be knotted.

An integral support plate 27 fixed to the housing in the area of the head 6 is used to hold the components of the sewing machine 1. This support plate 27 particularly holds the parts for guiding the upper thread 28 (see Fig. 5). The upper thread guide ring 29, the upper thread tension applying devices 30 and 31, the thread control spring 32 and the upper thread guide ring 33 in front of the thread lever 34 in the upper thread path are provided in the path of the upper thread 28, Another upper thread guide ring 35 following the thread lever 34 in the upper thread path, an upper thread clamp 36 and two different upper thread guide rings 37 and 38 following the upper thread clamp 36 in the upper thread path, .

The supporting plate 27 holds actuators for opening and closing the parts of the upper thread tension applying devices 30 and 31, that is, the tension imparting parts of the tension applying devices, and these actuators can be pneumatic cylinders. The tensile imparting components may be tensile imparting discs. This tensile imparting disk is shown as "38a" in FIG. For mechanical triggering of the tensioning devices 30, 31, the support plate 27 also holds a pivotable plate, which can be pivoted between the tensioning discs 38a.

2, the support plate 27 has a cable guide, which can be comprised of a cable conduit in which both the cable and the pneumatic line of the sewing machine 1 can be mounted .

The support plate 27 can be connected to the corresponding phase change in the housing of the sewing machine 1 by a plug connection. And all the supply lines necessary for the operation of the parts held by the support plate 27 can be guided to the plug connection of the support plate 27 thereof. And the relative plug connection in the housing ensures that the parts held by the support plate 27 are attached by the supply line connection adjacent to the support plate.

The thread lever 34 guides the upper thread 28. The seal lever 34 can be driven synchronously with the stitch forming tools 10, 11 to be displaced between the top dead center and the bottom dead center. The position of the "seal lever top dead center" is shown in Fig.

In addition to these components, the support plate 27 holds the seal lever protector 39, which is an integral part of the support plate 27. [ Figs. 2 and 5 show two embodiments of the seal lever protector 39. Fig. In the embodiment according to Fig. 5, the seal lever protector 39 is constituted only by a protrusion extending perpendicular to the housing casing, and the outer contour of the protrusion protrusion is suitable for the movement path of the seal lever 34 . In the configuration according to Fig. 2, the seal lever protector 39 additionally has a front cover 40, which covers the movement path of the seal lever 34 on the end face, i.e. the worker's side.

The thread lever protector 39 may have a threading groove to facilitate the threading of the upper thread 28 in the region of the thread lever 34.

In addition, the support plate 27 holds the sewing machine actuating elements, in the form of a multi-button actuating field 41 with a total of six actuating buttons 42 on the one hand, and on the other hand, and an operating momentary-contact switch 43, whose functions can be assigned in advance.

The support plate 27 also has a winding device 44 for winding on the thread bobbin.

The support plate 27 also has a position presetting device 45 in the form of a setting wheel which is used to preset the relative positions of the stitch forming tools 10 and 11, (5) in advance.

The support plate 27 also holds a lighting device 46, which is schematically shown in Fig. The lighting device 46 serves to illuminate a portion of the sewing field. This sewing field may be the field before sewing, which is the sewing field area before the stitching area of the needle 10 entering the sewing machine.

Finally, the support plate 27 has an influence on the length of the upper thread path between the upper thread guide ring 33 (the upper thread guide part located upstream of the thread lever 34 in the upper thread path) and the thread lever 34 itself Maintains the real path presets for the cycle. This thread path presetting device 47 will be described in more detail below. The thread path presetting device 47 ensures that the upper thread 28 moves from the shuttle to the correct tension during loop formation at a given material thickness of the sewing material.

The support plate 27 holds all yarn guide parts of the sewing machine 1 from the upper thread tension applying devices 30 and 31 (positioned upstream in the upper thread path) on the support plate side to the seal lever 34. [ The support plate 27 also holds all yarn guide parts of the sewing machine 1 in the upper thread path from the yarn lever 34 to the sewing needle 10.

The upper thread path of the upper thread 28 between the upper thread guide hook 29 and the upper thread guide hook 38 is shown as a path display portion 47a on the support plate 27. [ The path display portion 47a is formed as a display portion which is raised or recessed in the support plate 27. [ The path display portion 47a makes it easy to hang the upper thread 28 along the upper thread path.

The upper thread path presetting device 47 has a protruding element which is disposed between the upper thread guide ring 33 (upper thread thread guide part in front of the thread lever 34 in the upper thread path) and the thread lever 34, (28) is moved away from the main thread guide surface. This main thread guide surface is defined by an upper thread guide ring 33, a thread lever 34 and an upper thread guide ring 35 (a downstream upper thread guide part following the thread lever 34 in the upper thread path). The leading thread guide surface is approximately parallel to the plane of Fig.

The protruding element of the thread path presetting device 47 is a bracket or an arcuate body 48. The prong body 48 extends across the upper thread advance between the upper thread guide ring 33 and the thread lever 34. As an alternative to a bracket or an arcuate body, the protruding element 48 may also be constructed as a web that can be compared to the seal lever protector 39 of the configuration according to Fig.

The arcuate body 48 has a bracket or an arcuate convex portion 49 that sets in advance the area where the protruding element 48 projects more onto the leading thread thread guide surface. In the configuration shown, the convex portion 49 of the arcuate body is a rounded portion of the arcuate body 48.

The two ends 50, 51 of the arcuate body 48 are fixed to the housing of the sewing machine, that is, the support plate 27. At the assembled position of the arcuate body 48, the upper end is mounted around the pivot axis 52 (parallel to the arm 2) (see FIG. 2) in the pivoting bearing 53 of the support plate 27. In this end region, the arcuate body 48 is bent at an angle of 90 DEG with respect to the other main extensions parallel to the end plate portion 54 of the head 6.

In the assembled position, at the other lower end 51 the actuating body 48 is adjustably attached to the housing of the sewing machine, i. In the area of the arcuate body end portion 51, the arcuate body 48 is bent at 90 degrees, and a part of the arcuate body at the end extends to the arcuate body end portion 51 perpendicularly to the surface of Fig.

Two different relative position adjustability of the end 51 of the arcuate body 48 is clearly shown in Figures 3 and 4. At the adjustable end 51 of the arrangement shown, the arcuate body 48 has a total of four latching indicia, which engage the latching grooves 55, 55 formed in the adjustable arcuate end 51, 56, 57, 58). These latching grooves 55-58 pre-set the respective relative positions of the adjustable arcuate ends 51 relative to the housing in cooperation with a phase change in the form of a spring 59 of the support plate 27 . 3 shows the position at which the phase shifting 59 cooperates with the latching groove 58 located farthest from the adjustable arcuate end 51.

3, the convex portion 49 of the arcuate body is located relatively close to the support plate 27, so that the convex portion 49 of the arcuate body is minimally protruded above the support plate and the guide surface of the upper thread chamber .

Figure 4 shows the relative position of the adjustable arcuate end 51 with respect to the support plate 27 where the arcuate groove 55 is located closest to the arcuate end 51, . At this relative position, the arcuate body 48, in particular, the convex portion 49 of this arcuate body, protrudes most to the support plate 27 and the main thread thread guide surface. The convex portion 49 of the arcuate body can be projected onto the main thread guide surface by the cooperation of the latching groove 56 or 57 positioned between the latching groove 56 or 57 and the phase replacement 59, And the minimum protrusion according to Fig. Depending on how much loose seal area is created, the projecting position of the arcuate body 48 is adjusted at the adjustable arcuate end 51.

The large loose seal area plays a role, especially in the thick sewing material to be sewn.

At the portion between the convex portion 49 of the arcuate body and the end portion 51 bent at 90 degrees, the arcuate body 48 partially has the curved portion to keep the minimum clearance from the yarn control spring 32.

Figs. 5-9 illustrate the operation of the real path prescaler 47. Fig.

5 shows the arm axis position of "0 DEG, " at which point the needle 10 is at the top dead center of its motion path. The thread lever 34 is in an upward path from the arm axis position according to FIG.

6 shows the arm axis position of "60 DEG ", and the seal lever 34 is at the top dead center. The upper thread 28 is tensioned between the yarn control spring 32 and the thread lever 34 and particularly between the upper thread guide ring 33 and the thread lever 34 and is engaged with the convex portion 49 of the arc- Shaped body 48 in the region between the end portions 50. [

Figure 7 shows the arm axis position of "160 [deg.] &Quot;, in which the thread lever 34 is in a downward path down from the top dead center. Therefore, the upper thread 28 is not pulled any more and is loosened in the thread path between the upper thread guide ring 33 and the thread lever 34. This is called the "loose seal zone". The thread path presetting device 47 ensures that the loose upper thread 28 between the upper thread guide ring 33 and the thread lever 34 has a prescribed course. And the upper thread 28 is placed on the arcuate body 48 between the convex portion 49 of the arcuate body and the swivelable end portion 50.

8 shows the arm axis position of "220 [deg.], Where the seal lever 34 is in a further downward path and is at the level of the convex portion 49 of the generally arcuate body. 7, the looser upper thread 28 is located on the arcuate body 48 in the region of the convex portion 49 of the arcuate body. Also, due to the shape of the arcuate body 48, the upper thread 28 between the upper thread guide ring 33 and the thread lever 34 has a prescribed course. In particular, in the region of the arm axis position between the positions according to FIGS. 7 and 8 a large upper thread loop is prevented from being formed in an uncontrolled manner.

9 shows the arm axis position of "270 DEG, " at which the thread lever 34 is in the region of its bottom dead center. Now the upper thread 28 lies on the arcuate body 48 in the region between the arcuate convex portion 49 and the adjustable arcuate end 51.

Another protruding element in the form of the above-mentioned protruding element in connection with the thread path prescribing device 47 may be arranged after the thread lever 34 in the upper thread path. In particular, two protruding elements may be disposed adjacent to the seal lever on either side of the seal lever 34, such as for example an arcuate body 48 and other protruding elements (which may also be designed as an arcuate or hollow body or hollow body) have.

Claims (9)

- housings (2, 3, 4),
- a stitch forming tool (10, 11) for forming a seam and including a needle bar (9) for holding a sewing needle (10)
A seal lever 34 guiding the upper thread 28 and being driven synchronously with the stitch forming tools 10 and 11 to be displaced between a top dead center and a bottom dead center,
- Upper upper thread guide part (33) in front of the thread lever (34) in the upper thread path,
- a downstream upper thread guide part (35) next to said thread lever (34) in the upper thread path, and
- a sewing machine (1) including a thread path presetting device (47) for influencing the length of the upper thread path between the upper thread guide part (33) and the thread lever (34)
The thread path presetting device 47 has at least one protruding element 48 which is positioned between the upper thread guide component 33 and the thread lever 34 such that the upper thread 28 is positioned between the upper thread gap Is disposed so as to pass over a main thread guide surface defined by the component (33), the thread lever (34) and the downstream thread guide member (35). 2. The cartridge according to claim 1, characterized in that the projecting element (48) is displaceable with respect to the housing (27) in order to preset an upper thread path length between the upper thread guide part (33) and the thread lever Sewing machine. 2. The apparatus of claim 1, wherein the projecting element (48) is a bracket that extends across threading of an upper thread (28) between the upper thread guide (33) and the thread lever And a sewing machine. The method of claim 3,
Wherein the bracket (48) has a convex portion (49) of a bracket. The sewing machine according to claim 3, wherein the two ends (50, 51) of the bracket (48) are fixed to the housing (27). 4. A sewing machine according to claim 3, characterized in that the bracket (48) is adjustable at least at one end (51). 7. The apparatus according to claim 6, characterized in that the bracket (48) has at least two latching indicators (55-58), which in each case cooperate with a phase change (59) fixed to the housing (27) (27) of the adjustable end (51) of the bracket. The sewing machine according to claim 7, wherein the latching display portions (55 to 58) are latching grooves formed in the adjustable end portion (51) of the bracket. 2. The apparatus according to claim 1, characterized in that the thread path presetting device (47) and the two upper thread guide parts (33, 35) are held by a common support plate (27) fixed to the housings Sewing machine.

Images