TWI515347B - Sewing Machine - Google Patents

Description

Sewing machine

The present invention relates to a sewing machine having a needle bar and a conveying device.

Sewing machines of this type are known from US 1,010,830 and DE 101 23 075 C1.

It is an object of the invention to improve a sewing machine of the type mentioned at the outset such that a sewing machine housing adjacent to the stitching area can be compactly designed.

The object is achieved according to the invention by a sewing machine having the features given in item 1 of the patent application.

It is recognized in accordance with the present invention that a tie rod/link can be used to actuate a tangential knife or a wire cutter and support the support of the conveyor-transfer mechanism. The fact that the drawbar is driven during the tangential movement does not interfere with the dual function described, since no sewing work is performed during this (tangential) period. A separate support rod for the support of the conveyor-transmission mechanism can be omitted. In the stitching area, the housing of the sewing machine, in particular the free arm of the sewing machine, can be designed to be very compact in this case. This achieves that the housing of the sewing machine is designed to perform complex sewing tasks in areas of the sewing material that are difficult to access. By means of the fixing body fixed relative to the housing or fixed relative to the frame, it is possible to prevent the support body from being displaced when the lever is displaced, so that the conveyor-transmission mechanism remains stationary while actuating the thread cutting blade transmission mechanism. The support of the transfer device-transmission mechanism is connected to the pull rod of the tangential knife transfer mechanism such that the support body maintains a position in the axial direction relative to the sewing machine housing when the pull rod of the tangential knife transfer mechanism is displaced axially, so that the tangential cutter The actuation (motion) can be decoupled from the sewing conveyance by the conveyor. In particular, it is also avoided that actuation of the conveying device also automatically leads to actuation of the tangential knife. The support body can be present in the manner of an actuating lever which is connected to a conveyor bracket by a hinged structure with a hinge axis.

In principle, the sewing machine according to the invention does not have to be equipped with a complete thread cutting device. The sewing machine according to item 2 of the patent application scope is equipped with all the line devices, which expands the functionality of the sewing machine. The tie rod can be displaced by a drive device through a tangential knife transfer mechanism for tangential routing. The displacement drive can be designed as a pneumatic drive, a stepper motor or a hoist magnet/stroke magnet that can be controlled.

According to the tangential knife adjusting member of the third aspect of the patent application, the position of the tangential cutter relative to the position of the stitch forming member of the sewing machine is realized, and in particular, the tangential cutter is adjusted transversely to the sewing direction.

According to the fourth aspect of the patent application, the housing adjustment member that is fixed relative to the housing or fixed relative to the frame realizes the position of the conveying device relative to the stitch forming member of the sewing machine, and particularly realizes the adjustment of the conveying device transversely to the sewing direction. The transfer device can be displaced by the transfer device transfer mechanism.

The common adjustment of the shuttle/chip shuttle/gear device (Greifer) and the tangential knife is achieved according to the public support unit of claim 5th. This can be achieved with a tangential knife adjustment element which at the same time has the function of a shuttle adjustment element. The shuttle can be a vertical shuttle, a shuttle that rotates about a vertical axis.

The counter-rotating knife, which is arranged to be fixed relative to the shuttle according to item 6 of the scope of the patent application, can be positioned with the tangential cutter by the displacement of the tangential knife adjusting member, which has a common support structure with the shuttle The same is fixed relative to the shuttle. As a result, after the tangential knife adjustment element has been displaced, it is no longer necessary to position the tangential knife relative to the counter knives.

According to the free-arm type sewing machine of the seventh aspect of the patent application, the advantage of the compact sewing machine casing in the stitch forming region can function particularly well. The free arm can, for example, allow for the laying of tubular seams.

The double needle sewing machine according to item 8 of the patent application can be used in particular in the manufacture of circular or tubular filters.

The two thread cutting devices according to item 9 of the scope of the patent application improve the functionality of the double needle sewing machine.

According to the two tangential knife adjustment elements of claim 10, the position of the two tangential knives is independently specified. In this case, it is also possible to support the knives of the two-needle sewing machine and the associated shuttles each by a common support unit. As a result, it is possible to easily adjust the distance of the shuttles from each other by means of a tangential knife adjustment element which simultaneously has the function of the shuttle adjustment element.

The adjustability of the adjusting element according to the scope of claim 11 simplifies the adjustment of the sewing machine.

Simple illustration

Embodiments of the invention are explained in detail below with reference to the drawings. 1 is a front view showing a single-needle free-arm type sewing machine; FIG. 2 is a partial enlarged view showing a region of the free-arm end portion of FIG. 1; FIG. 3 is similar to the second The view of the drawing shows the components of the tangential knife transfer mechanism and the transfer device-transfer mechanism of the single needle free arm type sewing machine; Fig. 4 shows the parts shown in Fig. 3 in a perspective view obliquely from above; Fig. 5 A cross-sectional view according to a line VV in FIG. 3 is shown; a sixth view shows a cross-sectional view according to a line VI-VI in FIG. 5; and a seventh view shows a free arm end of the double-needle free-arm sewing machine in a perspective view. And FIG. 8 shows a component of the tangential knife transfer mechanism and the transfer device-transfer mechanism of the double needle free arm type sewing machine according to Fig. 7 in a view similar to Fig. 4.

Detailed description of the preferred embodiment

The free-arm sewing machine 1 has a base plate 2 having a column 3 and an angled arm 4 extending upward therefrom. The portion of the base plate 2 opposite the arm 4 is designed as a free arm 5, so that the sewing machine 1 can be used, for example, for piping work, quilting work and installation work on bags and boxes. The free arm 5 is freely oriented transversely to the arm towards all sides, which allows the tubular seam to be pulled onto the free arm 5 to achieve a sewing area that cannot be achieved with a conventional C-shaped sewing machine and can be formed in this area For example, a circumferential seam.

The upper arm 4 terminates in the head 6. A spindle 7 which is schematically shown in Fig. 1 is rotatably supported in the upper arm 4. The spindle 7 drives a crank drive with a take-up lever/wire rod in the head 6. The crank drive is in transmission connection with a needle bar 8 supported in the head 6 in an axially displaceable manner. The needle bar 8 has a needle 9 on its lower end. The needle 9 is moved up and down along a vertical axis 10 (see Fig. 2) by a crank drive. The needle 9 guides the sewing thread of the warp tensioning device 11 and the thread take-up lever from the bobbin/line tube in the eye of the needle.

The upper side of the free arm 5 is designed as a support plate 12 for supporting the sewing material (see Fig. 2). The support plate 12 is divided into a needle plate portion 13 and a needle plate slide plate 14. The needle plate portion 13 is fixedly mounted on the casing 15 of the sewing machine 1. The needle plate slide 14 can be displaced to the right in Fig. 2 after the fastening spring 16 is loosened (see Fig. 2), and allows (people) to access the components disposed under the needle plate slide 14.

The needle plate portion 13 is formed with a notch 17 through which the lower sewing material conveying device or the feed slider/feeding tooth 18 passes in the stitching region of the needle 9. The lower sewing material transfer device 18 has a pinhole 19 through which the needle 9 passes. These components are shown in dashed lines in Figure 2.

The lower sewing material conveying device 18 is for conveying the sewing material together with the upper sewing material conveying device 20 in the sewing material conveying direction, the sewing material conveying direction being perpendicular to the viewing planes of the first and second figures and directed in the viewing plane.

The lower sewing material conveying device 18 performs a conveying motion in the sewing conveyance direction in the sewing work, which is rotated by the spindle 7 in the case of being guided via the conveying device-transfer mechanism 21 mounted in the free arm 5. drive. A portion of the transfer device-transfer mechanism 21 is a conveyor eccentric shaft 22 extending along the free arm 5 (see Fig. 4), the eccentricity E, i.e., the deviation between the rotational symmetry axis 23 and the support axis 24, is at the 5th Shown in the figure. Further, a part of the conveying device-transfer mechanism 21 is a swing shaft 24a provided along the free arm 5. The swing shaft 24a is drivingly coupled to a bottom shaft (not shown) of the sewing machine 1 via a stitch adjuster transmission. The oscillating shaft 24a is oscillated about its axis 24b by a needle adjuster transmission (also not shown in the drawings). The adjustable conveying stroke is transmitted via the eccentric shaft 22 and the transfer body 25 designed as a slide to the conveyor carrier 26 for the lower sewing material transfer device 18. The lower sewing material transfer device 18 is supported on the conveyor support 26 in a manner that is vertically displaceable relative to the conveyor bracket 26. The lower sewing material transfer device 18 is raised by the transfer body 25 above the height of the needle plate portion 13 in the respective transport phase of the lower sewing material transfer device 18. The oscillating movement of the oscillating shaft 24a is transmitted by a moving rod 26a to the conveyor bracket 26, which stipulates the conveying movement of the conveyor holder 26, that is, the stitch length which can be achieved in the sewing operation accordingly. The conveyor bracket 26 is connected to a tie rod 28 extending along the free arm 5 by a tangential knife transmission mechanism 29 (described below) mounted in the free arm 5 by a support in the form of a further movement rod 27. The tie rod 28 is disposed parallel to the swing shaft 24a. The tie rod 28 extends transversely to the sewing direction. The movement rod 27 is connected on the one hand to the conveyor bracket 26 in a manner that is hinged about a hinge axis 30 extending parallel to the axis 24, and on the other hand to the threaded rod 28 in a manner that is hinged about the rod axis 31. The oscillating movement of the movement rod 27 about the rod axis 31 during the lower conveying operation is illustrated by the double arrow 32 in Fig. 4.

The axial position of the movement rod 27 along the rod axis 31 is defined by the conveyor adjustment element in the form of an adjustment plate 33. To this end, the adjustment plate 33 has a fork portion 34 that engages the movement rod 27 on both axial sides. The moving rod 27 has a small gap in the axial direction in the fork portion 34. The adjusting plate 33 has a fixing portion 35 with a fixing screw 36, by means of which the adjusting plate 33 can be fixed to the housing 15 in a predetermined axial position along the free arm 5. By virtue of the axial position of the adjustment plate 33, the axial position of the movement lever 27, and thus the conveyor bracket 26, and the axial position of the lower sewing material transfer device 18 associated therewith can be specified.

The tangential tie rod 28 is axially displaceable in the vicinity of its free end in a sliding sleeve 37 fixed relative to the housing. The sliding sleeve 37 is disposed between the moving rod 27 that surrounds the engaging rod 28 on the end side and the tangential knife adjusting element 38 that is designed in the form of an adjustable fork. The adjustable fork 38 is fixed to the tangential tie rod 28 by two fixing screws 39 and is axially fixed relative to the tangential tie rod 28. The axial end of the wall section 40 defines the axis of the adjustable fork 38 along the axis of the tie rod 28 . To the adjustment range.

The adjustable fork 38, i.e., the fork section 41 of the tangential knife adjustment element (see Figure 5), surrounds the vertically extending support pin 42. The support pin 42 and the transmission rod 43 of the tangential knife transmission mechanism 29 are connected in a non-rotatable manner. The transfer rod 43 is in turn connected to the wire cutter pin 44 in a rotationally fixed manner. The wire cutter pin 44 extends vertically. The pin axis 45 of the wire cutter pin 44 is spaced from the pin axis of the support pin 42.

The wire cutter pin 44 is supported in a shuttle bearing 46 that is fixed relative to the housing in such a manner as to be rotatable about the pin axis 45. The shuttle bearing 46 is only partially visible in Figure 6. The shuttle bearing 46 is simultaneously used to support the shuttle 47 of the sewing machine 1. The shuttle 47 has a shuttle body with a shuttle tip 48 for grasping the sewing thread (see Fig. 6). The shuttle 47 is rotatable about a vertical shuttle axis, wherein the rotational drive of the shuttle 47 is in turn led by the movement of the spindle 7.

The wire cutter pin 44 is connected to the wire cutter or the wire cutter 49 in a rotationally fixed manner, and the wire cutter or wire cutter 49 cooperates with a counter knife 50 fixed with respect to the shuttle bearing to cut the stitch. The reverse knives 50 are fixed to a support plate 51. The support plate 51 is in turn fixedly connected to the shuttle bearing 46.

Through the housing windows 52 and 53, respectively, the conveyor adjustment member, i.e., the adjustment plate 33, can be accessed from the same side of the sewing machine 1, and the tangential adjustment member 38 can be contacted, that is, the fork can be adjusted (see Fig. 2).

When the sewing machine 1 performs the sewing work, a seam is formed in the stitch region of the sewing material. In the sewing operation, the swing shaft 24a is oscillated from the main shaft 7 via the bottom shaft via the stitch adjuster transmission. This oscillating motion is transmitted by the travel bar 26a to the conveyor bracket 26, through which the conveyor bracket 26 is transferred to the lower sewing conveyor or feed slider 18. Since the moving rod 26a is fixed to the swing shaft 24a, the conveyor bracket 26 is fixed in the axial direction, that is, transverse to the sewing direction. Further, when the sewing machine 1 performs the sewing operation, the conveying device eccentric shaft 22 rotates, and the conveying body 25 defines the conveying stroke of the conveying device holder 26. By the driving of the two shafts 22 and 24a, the lower sewing material conveying device 18 performs a conveying motion to convey the sewing material in the sewing direction.

In order to adjust the position of the conveyor holder 26 in the axial direction of the free arm 5, that is, to define the position of the lower material conveying device 18 transverse to the sewing direction, the fixing of the movement rod 26a on the pivot shaft 24a is first removed. Then, the fixing screw 36 of the regulating plate 33 is detached through the casing window 52, and then the regulating plate 33 can be displaced along the double arrow 54 in Fig. 2. In response to this shift, the moving rod 27, the conveyor bracket 26 and the moving rod 26a are displaced transversely to the sewing direction, so that the lower sewing material transfer device 18 can be adjusted.

In order to adjust the position of the shuttle 47 and adjust the position of the tangential cutter 49, the two fixing screws 39 can be detached through the housing window 53, and then the fork 38 can be moved axially relative to the tie rod 28, which causes the shuttle 47, tangent The position of the knife 49 and the counter knife 40 transverse to the sewing direction changes accordingly.

During the sewing operation, the tangential tie rod 28 maintains the axial position (unchanged) and has the function of a support rod for the adjustable fork 38 and the movement rod 27.

To perform the tangential line, a pneumatic cylinder, not shown in the drawings, is actuated which displaces the pull rod 28 between the rest position and the cut position along the double arrow 55 in Fig. 4. Alternatively, the displacement of the tie rod 28 between the rest position and the cut position can also be achieved by a stepper motor or a lifting magnet. The displacement of the pull rod 28 from the rest position to the cut position causes the fork 38 and the driven support pin 42 to be axially displaced accordingly, wherein the wire cutter pin 44 is in the shuttle bearing 36 due to this movement of the support pin 42. Swing around the pin axis 45 (see double arrow 56 in Figure 4). This causes the tangential cutter 49 to perform a corresponding cutting oscillating motion with respect to the counter knives 50, thereby cutting the line between the two knives 49, 50. During axial displacement of the pull rod 28, the pull rod 28 slides on the one hand with respect to the sliding sleeve 37 and on the other hand with respect to the moving rod 27. When the pull rod 28 is axially displaced, the moving rod 27 is held in the axial position relative to the housing 15 (unchanged) because the moving rod 27 is held by the fork portion 34 of the adjusting plate 33 fixed relative to the housing. That is, the adjusting plate 33 serves as a fixed body for fixing the moving rod 27 and thus the axial position of the lower sewing material transfer device 18 during the tangential line.

In the sewing machine 1, the tie rod 28 simultaneously has a function of transmitting force in the tangential knife transmission mechanism, and a support function for supporting the movement rod 27 and supporting the tangential cutter adjustment member 38.

The double needle embodiment of the free arm sewing machine 57 will now be described with reference to Figures 7 and 8. The components and functions corresponding to those already explained with reference to FIGS. 1 to 6 above have the same reference numerals and will not be described in detail.

The sewing machine 57 has a common needle bar 58 having a support body 59 for two sewing needles (not shown in the drawings) for the double needle sewing machine 57. In the sewing machine 57, both sewing needles are equipped with a lower sewing material conveying device or a feeding slider 18, the lower sewing material conveying device having a corresponding upper sewing material conveying device 20, and the upper sewing material conveying device 20 corresponding thereto There are two pinholes for two sewing needles (not shown). A separate shuttle 47 is provided for each of the two sewing needles. Each of the two shuttles 47 is supported in a separate shuttle bearing 46, wherein the shuttle bearing 46 assigned to the shuttle 47 on the left in the figure can be seen in FIG. The two shuttle bearings 46 are components that are designed to be separated from one another.

The two lower sewing material transfer devices 18 of the sewing machine 57 are coupled to the conveyor holder 26. The structure of the conveyor holder 26 and the conveyor-transfer mechanism 21 corresponds to the structure of the components in the sewing machine 1 according to the first to sixth drawings. Each of the two needles of the sewing machine 57 has a tangent knife thus disposed. The tangential cutter 49 and the associated tangential knife transmission mechanism 29 correspond to the tangential cutter 49 and the associated tangential knife transmission mechanism 29 described above with respect to the sewing machine 1 according to FIGS. 1 to 6.

In the sewing machine 57, the tie rod 28 is extended beyond the position of the movement rod 27 and has a further adjustable fork 38' on its free end, the other adjustable fork 38' belonging to the other for the second tangential cutter 49 All of the wire cutter transfer mechanisms 29 cooperate with the second reverse cutter 50. The other adjustable fork 38' can also be secured along the drawbar 28 by a plurality of screws 39 in a defined axial position, as previously explained with respect to the sewing machine 1. A further housing window 60 is provided for the fixing screw 39 of the further adjustable fork 38', by means of which the other housing window 60 can be contacted from the same side of the sewing machine housing 15 to a fixing screw 39, such as a housing window 52, 53 like that. By detaching the fixing screw 39, in particular, the mutual distance of the two shuttles 47 of the sewing machine 57 can be specified.

The sewing work and the tangential work of the sewing machine 57 correspond to the sewing work and the tangential work described above with respect to the sewing machine 1. At the time of tangential threading, the two tangential knives 49 of the sewing machine 57 are simultaneously actuated by the tie rods 28.

1. . . Sewing machine

2. . . Substrate

3. . . Column

4. . . arm

5. . . Free arm

6. . . head

7. . . Spindle

8. . . Needle bar

9. . . needle

10. . . Vertical axis

11. . . Wire tensioning device

12. . . Support plate

13. . . Needle plate

14. . . Needle board skateboard

15. . . case

16. . . spring

17. . . gap

18. . . Lower sewing material conveyor

19. . . Pinhole

20. . . Upper sewing conveyor

twenty one. . . Conveyor - transmission mechanism

twenty two. . . Eccentric shaft

twenty three. . . Rotational axis of symmetry

twenty four. . . Support axis

24a. . . Swing axis

24b. . . Axis

25. . . Transfer body

26. . . support

26a. . . Sports pole

27. . . Sports pole

28. . . Tangential tie rod

29. . . Transmission mechanism

30. . . Articulation axis

31. . . Pull rod axis

32. . . Double arrow

33. . . Adjustment board

34. . . Fork

35. . . Fixed part

36. . . Fixing screws

37. . . Sleeve

38,38’. . . Adjustable fork

39. . . Fixing screws

40. . . Wall section

41. . . Fork section

42. . . Support pin

43. . . Transfer rod

44. . . Wire cutter

45. . . Pin axis

46. . . Shuttle bearing

47. . . Shuttle

48. . . Shuttle tip

49. . . Scraper

50. . . Reverse knife

51. . . Support plate

52,53. . . Housing window

54,55,56. . . Double arrow

57. . . Sewing machine

58. . . Needle bar

59. . . Support

60. . . Housing window

Figure 1 is a front elevational view of the single needle free arm sewing machine;

Figure 2 is a partial enlarged view of the region of the free arm end of Figure 1;

Figure 3 is a view similar to Figure 2 showing the components of the tangential knife transfer mechanism and the transfer device-transfer mechanism of the single needle free arm type sewing machine;

Figure 4 shows the components shown in Figure 3 in a perspective view obliquely from above;

Fig. 5 is a cross-sectional view showing a line V-V according to Fig. 3;

Figure 6 is a cross-sectional view showing a line VI-VI according to Figure 5;

Figure 7 is a perspective view showing the free arm end of the double needle free arm type sewing machine;

Fig. 8 is a view similar to Fig. 4 showing the components of the tangential knife transfer mechanism and the transfer device-transfer mechanism of the double needle free arm type sewing machine according to Fig. 7.

twenty two. . . Eccentric shaft

twenty four. . . Support axis

24a. . . Swing axis

24b. . . Axis

25. . . Transfer body

26. . . support

26a. . . Sports pole

27. . . Sports pole

29. . . Transmission mechanism

28. . . Tangential tie rod

30. . . Articulation axis

31. . . Pull rod axis

32. . . Double arrow

33. . . Adjustment board

34. . . Fork

35. . . Fixed part

36. . . Fixing screws

37. . . Sleeve

38. . . Adjustable fork

39. . . Fixing screws

40. . . Wall section

41. . . Fork section

42. . . Support pin

43. . . Transfer rod

44. . . Wire cutter

45. . . Pin axis

49. . . Scraper

50. . . Reverse knife

51. . . Support plate

55,56. . . Double arrow

Claims (11)

A sewing machine having a housing, at least one needle bar for holding a sewing needle, the sewing needle for forming a seam in the stitching area, and at least one for conveying the conveyance of the sewing material in the stitching area a device, a tangential knife transfer mechanism having a tie rod, the tangential knife transfer mechanism being connectable to a tangential cutter and a knife drive for displacing the tangential cutter between a rest position and a cut position, wherein The carrier of the transfer movement of the device is supported on the pull rod, wherein the support body is connected to the pull rod in such a manner that the support body is transferred in the thread cutter When the tension rod of the mechanism is axially displaced, the position is maintained in the axial direction. The sewing machine according to claim 1, wherein the sewing machine has at least one tangential device with a tangential knife that cooperates with a reverse knives to perform tangential cutting. The sewing machine of claim 2, wherein the tangential knife transmitting mechanism has a tangential knife adjusting member fixed to the rod in a manner adjustable along the rod, adjusted by adjusting the tangential cutter The component can specify the range of motion of the tangential cutter. The sewing machine according to any one of claims 1 to 3, wherein the sewing machine has a fixing in such a manner as to be adjustable along the tie rod A conveyor adjustment element on the sewing machine housing that regulates the axial position of the support by adjusting the conveyor adjustment element. The sewing machine according to the first aspect of the invention, wherein the sewing machine has a shuttle for a sewing machine and a common supporting unit for a thread cutter of the shuttle. The sewing machine of claim 5, wherein the reverse knives of the tangential cutter are arranged to be fixed relative to the shuttle. The sewing machine according to the first aspect of the invention, wherein the sewing machine is designed as a free arm type sewing machine. The sewing machine according to the first aspect of the invention, wherein the sewing machine is designed as a two-needle sewing machine. A sewing machine according to the invention of claim 8, wherein each of the needle bars is provided with a separate thread cutting device, the thread cutting device having a thread cutting knife, the thread cutting knife cooperating with the counter knife to perform a tangent. The sewing machine according to claim 1, wherein the tangential knife transmission mechanism has two tangential knife adjusting members fixed to the rods in such a manner as to be adjustable along the rods, by adjusting the tangential cutter The adjusting element can respectively define a range of motion of a respective one of the two tangential knives. The sewing machine according to the first aspect of the invention, wherein the respective adjusting members are accessible from the same side of the sewing machine.