TWM487321U - Sewing machine - Google Patents

Abstract

A sewing machine has a housing as well as stitch forming tools (10) for seam formation, including a needle bar (9) to hold a sewing needle (10). A one-piece support plate (27) fixed on the housing is used to carry components of the sewing machine (1). The support plate (27) carries at least one upper thread guide component (35, 36, 37) in the upper thread path after a thread lever (34) and at least one upper thread tensioning device (30, 31). The result is a sewing machine, the manufacturing and assembly of which is simplified.

Description

Sewing machine

The present invention relates to a sewing machine with a support plate that carries the components of the upper thread tensioning device.

Sewing machines of this type are known from DE 10 2011 005 198 A1 and DE 10 2007 039 596 A1. DE 103 12 602 A1 discloses a sewing machine with a support plate which, in addition to carrying the operating components, carries the components of the upper thread tensioning device. Another sewing machine is known from DE 103 44 982 A1 and DE 10 2009 047 534 A1.

One object of the present invention is to simplify the manufacture and assembly of sewing machines.

This object is achieved by a sewing machine according to the present invention, the sewing machine having: a housing; a stitch forming tool for forming a seam, the stitch forming tool comprising a needle bar for holding the needle; fixed to the housing An integral (monolithic, one-piece) support plate carrying the components of the sewing machine, wherein the support plate carries at least the following components: the upper thread (upper line) behind the wire rod (pick rod) The upper thread guiding member in the path, at least one upper thread tensioning device.

The one-piece support plate according to the present invention can be pre-manufactured with the sewing machine components carried and pre-assembled by it, which contributes to reduced manufacturing And the cost of both. Depending on the arrangement of the sewing machine, the support plate can also be equipped, for example, differently. This type of support plate can thus be constructed in one piece in the same manner for a plurality of sewing machine modules, which can thus be used in particular for a platform of a plurality of sewing machine modules which are thereafter differentially equipped. This reduces manufacturing costs.

The following configuration of the support plate has proven to be particularly advantageous: the support plate carries at least one upper thread clamp; the support plate carries a wire control spring; the wire rod protector is an integral part of the support plate; the support plate Carrying a sewing machine operating member; the support plate carrying a winding device; the support plate carrying a position presetting device for the stitch forming tool; the support plate carrying a lighting device for at least a portion of the sewing region; The support plate carrying line path presetting device affects the length of the upper line path between the upper thread guiding member and the wire rod in the upper thread path before the wire rod; the support plate carries All of the upper thread guiding members of the sewing machine from the side line tensioning device of the support plate located upstream in the upper thread path to the wire path of the wire rod; the support plate carrying the wire rod from the wire rod to the needle All upper thread guides in the line path. Depending on the configuration, a support plate module in which a plurality of functions are correspondingly formed is formed. The position presetting device for the stitch forming tool of the support plate can be constructed as an electronic hand wheel. The illumination device of the support plate for at least a portion of the sewing area may be a pre-illumination area. The plug connector for supporting the plate and connecting the supply line to the housing side plug connector facilitates the assembly of the support plate. These supply lines can be power supply lines and/or signal lines and/or pneumatic lines.

1‧‧‧ sewing machine

2‧‧‧ upper arm

3‧‧‧ column

4‧‧‧Substrate

5‧‧‧Bear axis

5a‧‧‧Frame

6‧‧‧ head

7‧‧‧High power prime mover

8‧‧‧Crank Transmission

9‧‧‧ Needle bar

10‧‧‧ needles; stitch forming tools

11‧‧‧Wire bobbin; stitch forming tool

12‧‧‧ shuttle pivot axis

13‧‧‧ shuttle swing axis

14‧‧‧ shuttle drive

15‧‧‧Drive unit

17‧‧‧Drive swing axis

18‧‧‧ Connecting rod

19‧‧‧ eyes

22‧‧‧Drive wheel

23‧‧‧Axial/radial bearings

23a‧‧‧bearing lining

25‧‧‧ traction mechanism

26‧‧‧ traction mechanism gear

27‧‧‧Support plate

28‧‧‧Face

29‧‧‧Face guide ring (hole, eyelet)

30,31‧‧‧Face line tensioner

32‧‧‧Line control spring

33, 35, 37, 38‧‧‧Face guide ring

34‧‧‧ pole

36‧‧‧Face clip

38a‧‧‧tight disk

39‧‧‧Wire protector

40‧‧‧ front cover

41‧‧‧Sewing machine operating elements; multi-button operating area

42‧‧‧ operation button

43‧‧‧Instantaneous contact operation switch

44‧‧‧Winding device

45‧‧‧ Position preset device

46‧‧‧Lighting device

47‧‧‧Line path preset device

47a‧‧‧path marking

48‧‧‧ protruding elements; bows

49‧‧‧ convex bow

50, 51‧‧‧ end

52‧‧‧ pivot axis

53‧‧‧ pivot fixed bearing

54‧‧‧End Plate Department

55, 56, 57, 58‧‧‧Latch slot

59‧‧‧ spring; for three-dimensional

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described in more detail with reference to the accompanying drawings in which: FIG. 1 is a perspective view of an operator side of a sewing machine for sewing a thick or strong sewing material, also partially reproduced. The internal details of the machine mechanism; Figure 2 shows a detailed side view of the sewing machine according to Figure 1 showing details in the area of the sewing machine head at the end of the arm of the sewing machine; Figure 3 shows Figure 2 a partial cross-sectional view of line III-III; Figure 4 shows a line path presetting device in the form of a wire bow of a sewing machine in a view similar to Figure 3, wherein the relative position of the bow end relative to the sewing machine housing is The position in Fig. 3 is different; and Figs. 5 to 9 show perspective views of the sewing head in various arm axis positions, thereby illustrating the function of the line path presetting device.

The sewing machine 1 has an upper arm 2, a column 3 and a bottom case, which is generally referred to as a substrate 4. The sewing machine 1 is designed to sew thick or strong sewing materials such as leather or plastic sheets. The parts 2 to 4 forming the housing of the sewing machine show only their outlines in FIG.

The arm shaft 5 is rotatably mounted on the frame 5a in the arm 2, which is schematically shown in Fig. 1. One of the arm shaft bearings is disposed in the arm shaft end region on the side where the column is located, and the other of the arm shaft bearings is disposed in the opposite arm shaft end region in the head portion 6 of the sewing machine 1. The drive of the arm shaft 5, which is also the basic sewing part of the sewing machine, is carried out by means of the high-power prime mover 7 shown schematically in FIG. By means of the arm shaft 5 and the crank transmission 8 The needle bar 9 vertically mounted in the head 6 is vertically driven up and down, and the needle bar 9 carries the needle 10 at its lower end.

The bobbin shuttle 11 is driven to reciprocate around the shuttle swing axis 12 of the shuttle swing shaft 13 in the substrate 4 below the needle bar 9. The bobbin shuttle 11 is also referred to as a bobbin looper. The shuttle pivot axis 12 extends horizontally and is parallel to the arm shaft 5. The spool shuttle 11 cooperates with the needle 10 for forming stitches and seams in the sewing material. The bobbin shuttle 11 and the needle 10 are stitch forming tools of the sewing machine 1. In addition to the bobbin shuttle, other types of shuttles can be used.

The oscillating drive of the bobbin shuttle 11 is performed by means of the shuttle drive unit 14. The shuttle drive 14 has a drive unit 15 to produce a drive oscillating motion about the drive pivot axis 17.

The drive rocking axis 17 extends parallel to the axes 5 and 13.

The arm shaft 5 serves as an outer peripheral drive shaft of the drive unit 15. Furthermore, the drive unit 15 has a connecting rod 18. One rod end of the connecting rod 18 is embodied as a rod eye 19 which has a drive connection to the arm shaft 5 by means of an eccentric unit. The other rod end of the connecting rod 18 is also embodied as a rod eye and has a drive connection to the transmission wheel 22 by means of an axial/radial bearing 23 . The drive wheel 22 is pivotally mounted on the bearing bushing 23a about the drive rocking shaft 17.

The connecting rod 18 has a drive connection to the drive wheel 22 such that the drive wheel 22 reciprocates about the drive rocking axis 17.

The traction mechanism 25 of the traction mechanism gear 26 of the shuttle drive 14 is guided on the outer circumference of the transmission wheel 22. The traction mechanism 25 is constructed as a toothed belt. The traction mechanism 25 meshes with an external tooth system on the outer circumference of the drive wheel 22.

The traction mechanism gear 26 is used to rotate the transmission wheel 22 around the transmission shaft The transmission oscillating motion of the wire 17 is converted into a drive oscillating motion of the shuttle oscillating shaft 13.

In order to form the stitches and seams, the bobbin of the bobbin shuttle 11 moves in synchronism with the needle 10, and grasps the upper thread loop passing through the needle through the needle 10, and knots the upper thread loop, the movement of the shuttle body The upper thread is guided around the bobbin case during the process, and the upper thread is knotted.

An integral support plate 27 fixed in the region of the head 6 of the housing is used to carry the components of the sewing machine 1. The support plate 27 in particular carries the components for guiding the upper thread 28 (see Figure 5). In the path of the upper thread 28, there is a line guide ring (hole, eyelet member) 29, two upper thread tensioning devices 30, 31, a line control spring 32, and another side of the upper thread path before the wire rod 34. The wire guide ring 33, the other upper wire guide ring 35 in the upper thread path behind the wire rod 34, the upper thread clamp 36 and the other two upper thread guide rings 37, 38 in the upper thread path behind the upper thread clamp 36 .

The support plate 27 carries the components of the upper thread tensioning devices 30, 31, that is, the actuators that open and close the tensioning members of the tensioning device, which can be constructed as pneumatic cylinders. These tensioning members can be tensioning discs. These tensioning discs are shown as 38a in Figure 3. For mechanical triggering of the tensioning devices 30, 31, the support plate 27 also carries a pivotable plate that is pivotable between the tensioning discs 38a.

Viewed from a side remote from the viewer, such as Figure 2, the support plate 27 has a cable guide which can be constructed as a cable conduit in which the cable and pneumatic lines of the sewing machine 1 can be mounted.

The support plate 27 is connectable to a corresponding pair of solids on the housing of the sewing machine 1 by means of a plug connection. Required to operate the components carried by the support plate 27 All of the supply lines can then be directed to the plug connection of the support plate 27. The opposite plug connection on the housing ensures the mounting of the components carried by the support plate 27 by means of a supply line connection adjacent thereto.

The wire rod 34 guides the upper thread 28. The wire rod 34 can be driven in synchronization with the stitch forming tools 10, 11 to be displaced between top dead center and bottom dead center. The position of the "rope top dead center" is shown in FIG.

In addition to these components, the support plate 27 carries a wire rod protector 39 which is an integral part of the support plate 27. Two embodiments of the pole guard 39 are shown in Figures 2 and 5. In the embodiment of Fig. 5, the pole guard 39 is specifically configured as a projecting panel extending perpendicular to the outer casing, the outer contour of which is adapted to the path of movement of the mast 34. In the configuration according to Fig. 2, the pole guard 39 also has a front cover 40 which covers the path of movement of the mast 34 at its end face, in other words towards the side of the operator.

The wire guard 39 can have lead slots to facilitate threading of the upper thread 28 in the region of the wire rod 34.

Furthermore, the support plate 27 carries the sewing machine operating elements, on the one hand in the form of a multi-button operating area 41 with a total of six operating buttons 42, and on the other hand in the form of a momentary contact operating switch 43, the function of which can be Pre-allocated.

Further, the support plate 27 has a winding device 44 for winding a wire around the yarn barrel.

Further, the support plate 27 has a position presetting device 45 in the form of a setting wheel for presetting the relative positions of the stitch forming tools 10, 11, in other words, the rotational position of the preselected arm shaft 5.

Furthermore, the support plate 27 carries the illumination device 46 shown schematically in FIG. Illumination device 46 is used to illuminate a portion of the sewing area. This can be a pre-sewn area, that is, the sewing area before the needle 10 enters the stitching to form the stitch area.

Finally, the support plate 27 carries a wired path preset device 47 for influencing the upper thread between the upper thread guide ring 33 and the wire rod 34 itself as the upstream upper thread guiding member in the upper thread path before the wire rod 34. Path length. The line path preset device 47 will be described in detail below. In the case where the thickness of the sewing material is given, the line path presetting means 47 ensures that the upper thread 28 travels on the shuttle body with an accurate tension during the looping.

The support plate 27 carries all of the wire guiding members of the sewing machine 1 from the support plate side in the upstream of the upper thread path, the upper thread tensioning devices 30, 31 to the wire rod 34. In addition, the support plate 27 also carries all of the wire guiding members of the sewing machine 1 from the wire rod 34 to the needle needle 10 in the upper thread path.

The needle line path between the needle thread guide loop 29 of the needle thread 28 and the needle thread guide loop 38 is indicated by a path mark 47a on the support plate 27. These path marks 47a are formed by protruding or recessed marks on the support plate 27. The path mark 47a facilitates the threading of the upper thread 28 along the upper thread path.

The line path preset device 47 has a protruding member 48 that is provided in such a manner that the needle thread guide ring 33 and the line as the upstream needle line guiding member in the upper thread path before the wire rod 34 are provided The upper thread 28 between the rods 34 is located outside the main upper thread guiding surface. The main upper thread guiding surface is defined by the upper thread guiding ring 33, the wire rod 34, and the upper thread guiding ring 35 as a downstream upper thread guiding member in the upper thread path behind the wire rod 34. Main face The line guiding surface is substantially parallel to the plane of FIG.

The protruding elements of the line path preset device 47 are configured as bows 48. The bow 48 extends transversely to the face line between the upper thread guide ring 33 and the wire rod 34. As an alternative to the bow, the protruding element 48 can also be constructed as a mesh body, similar to the wire rod protector 39 in the configuration according to FIG.

The bow 48 has a convex bow 49 which predetermines a region in which the projection of the projecting element 48 beyond the main face guide surface is more pronounced. In the illustrated configuration, the convex bow 49 is configured as a rounded (rounded) bend of the bow 48.

The two ends 50, 51 of the bow 48 are fixed to the housing of the sewing machine, i.e. to the support plate 27. In the assembled position of the bow 48, the upper end is mounted about a pivot axis 52 (see Fig. 2) extending parallel to the arm 2 and in the pivotal fixed bearing 53 of the support plate 27. The bow 48 is bent 90° in the region of the end 50 compared to the other body portions extending parallel to the end plate portion 54 of the head 6.

At the other end, i.e. the lower end 51 in the assembled position, the bow 48 is adjustably mounted on the housing of the sewing machine, i.e. the support plate 27. In the region of the end portion 51 of the bow, the bow 48 is then bent 90[deg.] and the bow extending to one end of the end 51 of the bow is perpendicular to the plane of FIG.

The two different relative positions of the ends 51 of the bows 48 in Figures 3 and 4 clearly show adjustability. At the adjustable end 51 of the illustrated configuration, the bow 48 has a total of four latching indicia configured to be applied to the latching grooves 55, 56, 57 and 58 of the adjustable arch end 51. The latching grooves 55 to 58 are in a three-dimensional fit with the spring 59 of the support plate 27 to divide It is not preset to adjust the relative position of the bow end 51 relative to the housing. Figure 3 shows the position in which the stereoscopic 59 cooperates with the latching slot 58 furthest from the adjustable bow end 51.

The relative position according to Fig. 3 causes the convex bow 49 to move closer to the support plate 27, so that the projection of the convex bow 49 beyond the support plate and thus also protrudes beyond the main face guide surface is minimal. .

Figure 4 shows the relative position of the adjustable arch end 51 relative to the support plate 27, in which the stereoscopic 59 cooperates with the latching slot 55 closest to the arch end 51. In this relative position, the bow 48, in particular the convex bow 49, has the greatest extent with respect to the support plate 27 and therefore also with respect to the main upper guide surface. Due to the cooperation of the three-dimensional 59 with the latching groove 56 or 57 between them, it is possible to cause the convex arch portion 49 to protrude beyond the main surface guiding surface, which is located at the maximum protrusion according to FIG. 4 and according to FIG. Between the minimum protrusions. The protruding position of the bow 48 is adjusted on the adjustable bow end 51 depending on how much slack line area is produced. The larger area of the slack line acts especially in thick seams to be sewn.

In the process (contour) between the convex bow portion 49 of the bow member 48 and the end portion 51 bent at 90[deg.], in order to minimize the spacing between the wire control springs 32, the bow member 48 has a partial bending process.

5 to 9 illustrate the function of the line path preset device 47.

Figure 5 shows the arm shaft position "0°" in which the needle 10 is at the top dead center of its path of travel. In the arm axis position according to Figure 5, the wire rod 34 is in the upward path.

Figure 6 shows the arm shaft position "60°" with the mast 34 at the top stop point. The upper thread 28 is tensioned between the wire control spring 32 and the wire rod 34, in particular between the upper thread guide ring 33 and the wire rod 34, and rests on the convex bow portion 49 and the pivotable end 50 of the bow 48. Between the areas.

Figure 7 shows the arm shaft position "160°" in which the mast 34 is in a path downward from top dead center. Therefore, the upper thread 28 is no longer tensioned in the line path between the upper thread guide ring 33 and the wire rod 34, but is relaxed. This is also called the "relaxation line area". The line path preset device 47 ensures that the slack line 28 between the upper thread guide ring 33 and the wire rod 34 has a defined progression. The upper thread 28 then rests on the bow 48 between the convex arch portion 49 and the pivotable end 50.

Figure 8 shows the arm shaft position "220°" in which the wire rod 34 is in its further descending path and is located substantially at the level at which the convex bow portion 49 is located. The upper thread 28 is now more slack than in the arm shaft position of Figure 7, which rests in the region of the arcuate portion 49 of the bow 48. The shape of the bow 48 also forces the upper thread 28 to have a defined progression between the upper thread guide ring 33 and the wire rod 34. In the region of the arm axis position between the positions according to FIGS. 7 and 8, the formation of a larger upper thread ring in an uncontrollable manner is particularly prevented.

Figure 9 shows the arm shaft position "270°" in which the mast 34 is in the position of the bottom dead center. The upper thread 28 now rests in the region of the bow 48 between the convex arch portion 49 and the adjustable arch end 51.

Still another protruding element described in the same manner as the protruding element described above in connection with the line path preset device 47 may be disposed in the upper thread path after the wire rod 34. In particular, the two protruding elements, for example the bow 48 and the further projecting element, which can be designed in the form of a bow or a solid body or a hollow body, can be arranged on both sides of the wire rod 34 and adjacent to the wire rod 34.

2‧‧‧ upper arm

6‧‧‧ head; nose

27‧‧‧Support plate

28‧‧‧Face

29‧‧‧Face guide ring (hole, eyelet)

30,31‧‧‧Face line tensioner

32‧‧‧Line control spring

33‧‧‧Face guide ring

34‧‧‧ pole

36‧‧‧Face clip

35,37,38‧‧‧Face guide ring

39‧‧‧Wire protector

41‧‧‧Sewing machine operating elements; multi-button operating area

42‧‧‧ operation button

43‧‧‧Instantaneous contact operation switch

44‧‧‧Winding device

45‧‧‧ Position preset device

47‧‧‧Line path preset device

48‧‧‧Bows; protruding elements

49‧‧‧ convex bow

Claims (12)

A sewing machine comprising: a casing, a stitch forming tool for forming a seam, the stitch forming tool comprising a needle bar for holding a needle, an integral support plate, the support plate being fixed to The housing is for carrying the components of the sewing machine, wherein the support plate carries at least the following components: an upper thread guiding member located behind the wire rod and in the upper thread path leading to the needle needle, - at least one upper thread tensioning device. A sewing machine according to claim 1, wherein the support plate carries at least one upper thread clamp. A sewing machine according to claim 1 or 2, wherein the support plate carries a wire control spring. A sewing machine according to claim 1 or 2, wherein the wire protection body is integrally formed on the support plate. A sewing machine according to claim 1 or 2, wherein the support plate carries a sewing machine operating member. A sewing machine according to claim 1 or 2, characterized in that the support plate carries a winding device. A sewing machine according to claim 1 or 2, characterized in that the support plate carries a position presetting means for the stitch forming tool. A sewing machine according to claim 1 or 2, wherein the support plate carries illumination means for at least a portion of the sewing area. The sewing machine according to claim 1 or 2, wherein the support plate carries a wire path presetting device that affects the upper thread guiding member upstream of the upper thread path before the wire rod And the length of the upper line path between the poles. A sewing machine according to claim 1 or 2, wherein the support plate carries all sides of the sewing machine from the support plate side wire tensioning device located upstream of the upper thread path to the upper thread path of the wire rod Wire guides. A sewing machine according to claim 1 or 2, wherein the support plate carries all of the upper thread guiding members in the upper thread path from the wire rod to the needle. A sewing machine according to claim 1 or 2, characterized in that the support plate is connected to the opposite plug connector on the housing side by a plug connector connected to the supply line.