TW201344003A - Thread feeding device of sewing machine - Google Patents

Abstract

This invention is to provide a thread feeding device of sewing machine capable of saving efforts in complex operation during re-threading process while changing-over hard thread seaming and soft thread seaming. The method utilized by the thread feeding device comprises: a thread feeding hole (34) contained to a swinging front side, a swinging scale (31) capable of being vertically swung and disposed around a swing axis (31a) of supporting the swing base side ; a first thread guide part (29) and a second thread guide part (30); and an active thread guide component (32) that is formed as different bodies together with the swinging scale (31) in the thread feeding device (20) of the sewing machine (21) of the active thread guide component (32) and configured to perform vertical and horizontal location regulations between the thread feeding hole (34) and the second thread guide part (30).

Description

Sewing machine wire feeding device

The present invention relates to a wire feeding device for a sewing machine for facilitating the delivery of a suture to a needle.

In the wire feeding device of the sewing machine, for example, the wire feeding device 9 of the sewing machine 8 includes the movable wire guide 1 and the first side of the sewing machine arm portion 2, which can be inserted into the needle thread. The wire feed hole 3 and the second wire feed hole 4 are provided with a swing balance 6 that controls the amount of feed of the shuttle wire in synchronization with the vertical movement of the needle bar 5 at the center; and the upper end portion of the needle bar 5 is inserted The thread feed hole 7a for threading and the needle balance 7 for controlling the feed amount of the needle thread are configured to be selectable from the movable wire guide 1 through the first wire feed hole 3 of the swing balance 6, and further through the needle bar scale 7 to the needle 10. The path R1 up to the path R1 and the movable wire guide 1 which is short from the comparative path R1 pass the path R2 which oscillates the 2nd wire-hole 4 of the scale 6 to the needle 10 (for example, refer patent document 1).

Therefore, since the thread paths R1 and R2 of different lengths can be selected for the needle thread path from the thread clamp 11 to the needle 10, for example, when a hard seam without slack is formed or when the needle thread is extended, ,only It is only necessary to select a longer path R1, or in order to form a slightly loose soft seam, a shorter path R2 can be selected.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-979

However, in the wire feeding device 9 of the sewing machine described above, when the hard seam and the soft seam are switched, the needle thread is selectively inserted back into the first wire feed hole 3 or the second which is integrally provided in the swing balance 6 The work of the wire feed hole 4 is necessary, and thus there is a problem that is extremely troublesome.

Further, in the case of a soft seam, the needle thread is loose and the skin feels poor in the sewing product. However, in order to reinforce the needle thread to reinforce the yarn sliding resistance in the thread clamp 11, there is a problem that the needle thread is easily broken.

The present invention has been made in order to solve the above problems, and an object thereof is to provide a wire-feeding device for a sewing machine which is labor-saving and capable of re-threading when a hard seam and a soft seam are switched. Further, another object of the present invention is to provide a wire feeding device for a sewing machine which can perform needle thread tightness without breaking the needle thread in the case of a soft seam.

The wire feeding device of the sewing machine of the present invention is provided with: a first lead portion for thread insertion of the threader; a second lead portion for thread insertion from the first lead portion; a movable lead guiding member for needle thread insertion from the second lead portion; and a swing front end a wire feed hole for inserting a needle thread from the movable wire guiding member, and a wire feeding device that is swingable up and down around a swing shaft that supports the swing base end side, and has the above-mentioned movable wire The guiding member is configured to be different from the swinging balance, and is provided between the wire feed hole and the second lead portion so as to be vertically adjustable.

According to the above, when the hard seam and the soft seam are switched, the upper and lower positions of the movable guide member are adjusted between the wire feed hole and the second lead portion, and the hard seam and the soft seam can be switched. In the past, the troublesome work of re-threading is relatively simple.

In a preferred embodiment of the wire feeding device of the sewing machine according to the present invention, the second lead portion is disposed between the movable wire guiding member and the first lead portion, and is configured to bend the needle thread passing through the second lead portion. The formation of a mountain shape that protrudes upward. Therefore, in the case of the soft seam, if the wire slide resistance is increased in the wire gripper, the needle thread is not broken, and a good elastic needle thread can be obtained.

Moreover, in the wire feeding device of the sewing machine according to the present invention, the means for adjusting the vertical position of the movable wire guiding member is to fix the frame on the front side of the sewing machine arm portion, and is arranged to be long in the vertical direction on the frame. In addition to the guide hole, the mounting bracket of the movable wire guiding member is fixed by a screw inserted through the guiding hole, and the screw is slid along the guiding hole to adjust the vertical position of the movable wire guiding member. Structure to make. Thereby, the vertical position of the movable wire guiding member can be stably and surely adjusted.

Further, in the wire feeding device of the sewing machine according to the present invention, the means for adjusting the left and right positions of the movable wire guiding member is to fix the movable wire by a screw inserted through a long guide hole provided in the left-right direction of the mounting frame. The guiding member has a configuration in which the screw is slid along the guide hole to adjust the left and right position of the movable wire guiding member. Thereby, the left and right positions of the movable wire guiding members can be stably and surely adjusted.

According to the present invention, it is possible to switch the hard seam and the soft seam between the wire feed hole of the swinging balance and the second wire portion by adjusting the upper and lower and the left and right positions of the movable wire guiding member, and the re-threading can be obtained. The labor-saving advantages of troublesome work.

T‧‧‧ needle thread

20‧‧‧Wire delivery device

21‧‧‧Sewing machine

21c‧‧‧Sewing machine arm

24, 26, 27‧‧‧ Thread clamp

29‧‧‧1st lead

30‧‧‧2nd wire section

31‧‧‧Swinging scales

31a‧‧‧Swing axis

32‧‧‧Active line guiding members

34‧‧‧Send hole

39, 42‧‧‧ Guide hole

40‧‧‧Guard

41, 44, 45‧‧‧ screws

43‧‧‧ Mounting bracket

Fig. 1 is a perspective view of a two-line lock stitch sewing machine to which the wire feeding device of the present invention is applied.

Figure 2 is a front view of the same double-thread lock sewing machine.

Figure 3 is a top view of the same double-thread lock sewing machine.

Figure 4 is an enlarged perspective view of the wire feeding device of the same double-thread lock sewing machine.

Figure 5 is an enlarged front view of the wire feeding device of the same double-thread lock sewing machine Figure.

Fig. 6 is an enlarged top view of the wire feeding device of the same double-thread lock sewing machine.

Fig. 7 is an enlarged perspective view showing the wire feeding device of the same double-thread lock sewing machine in a state in which the guard is removed.

Fig. 8 is an enlarged front elevational view showing the wire feeding device of the double-line lock stitch sewing machine in a state in which the guard frame is removed.

Fig. 9 is an enlarged plan view showing the wire feeding device of the double-line lock stitch sewing machine in a state in which the guard frame is removed.

Fig. 10 is a schematic front view of the wire feeding device of the same double-thread lock sewing machine.

Fig. 11 is a schematic front view showing a wire feeding device of a two-line lock stitch sewing machine of a conventional example.

Hereinafter, a preferred embodiment of the wire feeding device of the sewing machine according to the present invention will be described with reference to the drawings.

In the first to third drawings, a sewing machine 21 including a two-line lock stitch sewing machine as a wire feeding device 20 according to an embodiment of the present invention is shown. In the first to third figures, the sewing machine 21 has a bottom plate portion 21a, a vertical body portion 21b that is erected from the bottom plate portion 21a, and a sewing machine arm portion 21c that extends in parallel from the vertical body portion 21b and the bottom plate portion 21a.

The sewing machine 21 includes three pins 23 that are fixed to the lower end portion of the needle bar 22 that is reciprocally driven up and down by a sewing machine spindle (not shown). Three grippers 24 that respectively apply predetermined tension to the needle threads of the respective needles 23; a gripper 26 that imparts a predetermined tension to the upper thread passing through the upper thread splitter 25; and a bend by a looper (not shown) The needle thread imparts a tensioner 27 of a predetermined tension. The upper thread line splitter 25 is on the surface side of the cloth, and the curved needle is formed in the bottom plate portion 21a in conjunction with the sewing machine main shaft, and the sewing machine 21 is in common with the three needles 23 and the curved needles (not shown). The stitches formed by the action are wound on the side of the thread and form a decorative stitch of the double-line stitch.

The wire feeding device 20 includes an oil supply device 28 disposed on the left side of the yarn grippers 24, 26, and 27 on the front side of the longitudinal body portion 21b and disposed on the front side of the sewing machine arm portion 21c, and is disposed on the wire gripper 24, a first lead portion 29 between the 26 and 27 and the oil supply device 28; a second lead portion 30 disposed on the left side of the oil supply device 28; a swing balance 31 disposed on the left side of the second lead portion 30; and a swinging balance 31. The movable wire guiding member 32 which is disposed on the front side of the swinging balance 31 in a different body, repeats the pulling of the three stitches T (only one of the first figures) and the feeding of the slack line during the sewing. The first lead portion 29 has three line holes 33 through which the three needle lines T from the three grippers 24 are respectively passed. The oil supply device 28 is formed by a fuel tank 28a in which felt which is impregnated with eucalyptus oil as a lubricant is inserted, and the needle thread T is passed through the box to impart a needle T oil.

The oscillating balance 31 is a oscillating base 31b that is vertically oscillated about a swing shaft 31a connected to the main shaft of the sewing machine, and a swaying wrist that is fixed to the left and right sides of the oscillating base 31b, as shown in Fig. 7 and Fig. 8 . The 31c is configured to swing the amount of the control line to be fed between the predetermined top dead center and the bottom dead center in synchronization with the needle bar 22. At the left end of the swinging wrist 31c ( The front end portion is formed with three wire feed holes 34.

As shown in Fig. 7 and Fig. 8, the third and fourth lead portions 35 and 36 are provided on the front side of the sewing machine arm portion 21c corresponding to the left end portion (front end portion) of the swing arm 31c. A threader 37 is provided between the third lead portion 35 and the lead hole 34.

As shown in Figs. 7 to 9, the movable wire guiding member 32 is constituted by a support body 32a and three wire rods 32b which are formed with a wire hole 38 at the upper end portion and can be locked through the support body 32a. Each of the lead bars 32b is fixed at a predetermined position to be slidable relative to the vertical direction of the support body 32a, thereby adjusting the tightness of the wire and the amount of wire feed.

Further, the movable wire guiding member 32 is disposed so as to be vertically and horizontally adjustable between the wire feed hole 34 of the swinging balance 31 and the second lead wire portion 30. It is also possible to adjust the tightness of the thread and the amount of wire feed.

The specific adjustment means for the left and right and upper and lower positions of the movable wire guiding member 32 are as shown in Figs. 4 to 6 . On the front side of the sewing machine arm portion 21c, an elongated guide hole having an upward and downward direction is attached by a screw 41. 39 of the cage 40. On the frame 40, the screw 44 of the guide hole 39 of the frame 40 is inserted to fix the mounting bracket 43 having the elongated guide hole 42 in the left-right direction, and the screw 44 is slid along the guide hole 39. The position of the mounting frame 43 in the vertical direction can be adjusted stably and surely. On the mounting frame 43, the movable wire guiding member 32 is fixed by the screw 45 inserted through the guide hole 42, and the screw 45 is slid along the guide hole 42 to stably and surely adjust the position of the movable wire guiding member 32 in the left-right direction. The adjustment of the position of the movable wire guiding member 32 in the up and down direction is such that the screw 44 can be slid along the guide hole 39 to adjust the mounting bracket. 43 position in the up and down direction.

When the second lead portion 30 is formed with a soft stitch, the stitching resistance is increased by the gripper 24 when the needle thread T is tightened, so that the needle thread is not broken, and the needle thread T can be fastened. Between the 32 and the first lead portion 29, the needle thread T passing through the second lead portion 30 is disposed so as to be bent into a mountain shape which protrudes upward as shown in Fig. 10. The second lead portion 30 can be arbitrarily set so as to be fixed at a predetermined position or to be adjustable in the up and down position or to adjust the left and right positions.

The needle thread T inserted through the thread clamp 24 passes through the first lead portion 29 and the oil supply device 28, and then passes through the second thread guide 30. Next, the wire rod 32b of the member 32 is guided by the movable wire, and the wire hole 34 of the balance 31 is swung. Thereafter, the threader 37, the third lead portion 35, and the fourth lead portion 36 are sequentially passed toward the needle 23. Further, as shown in Fig. 4, a guard finger portion 46 for protecting the needle thread T from the wire feed hole 34 of the swinging balance 31 through the threader 37 is attached to the guard frame 40.

It is assumed that the path length of the needle thread path from the swing wire scale 31 to the third wire portion 35 by the movable wire guiding member 32 is L, the path length at the top dead center of the needle bar is L1, and the path length at the bottom dead center of the needle bar is L2. Needle bar top dead center When the path length difference of the bottom dead center is ΔL=L1-L2, and the up-and-down stroke amount of the needle bar 22 is H, the left and right aligning positions of the movable wire guiding member 32 can be adjusted to form 0<ΔL<H.

Further, in Fig. 10, the needle thread T indicated by the solid line a is the needle thread path at the time of the top dead center of the needle bar, and the needle thread T indicated by the broken line b is the needle thread path when the needle bar is at the bottom dead center.

In the wire feeder 20 having the above-described configuration, when it is desired to form a hard-slit seam which is less slack, or to prevent breakage of the wire, etc., the movement of the movable wire guiding member 32 to the left and downward is adjusted so that the needle bar is moved. Top dead center The path length difference ΔL at the bottom dead center is relatively large.

Further, when a soft seam having a certain degree of slack is formed, the movable wire guiding member 32 is reversely moved to the right and upward, so that the needle bar top dead center The path length difference ΔL at the bottom dead center is small.

According to the wire feeding device 20 of the sewing machine 21 described above, the movable wire guiding member 32 can be moved up and down between the wire feeding hole 34 of the swinging balance 31 and the second wire portion 30 in addition to the body different from the swinging balance 31. Position adjustment. Therefore, when forming a hard seam without slack or when securing a line, only the movable wire guiding member 32 is moved downward to the left, and when a slightly loose soft seam is formed, only the movable The wire guiding member 32 can be easily moved between the hard wire seam and the soft seam by moving the adjusted simple operation to the right and upward.

20‧‧‧Wire delivery device

21‧‧‧Sewing machine

21b‧‧‧From the mediastinum

21c‧‧‧Sewing machine arm

22‧‧‧ needle stick

23‧‧‧ needle

24, 26‧‧‧Clamping device

29‧‧‧1st lead

30‧‧‧2nd wire section

31‧‧‧Swinging scales

31a‧‧‧Swing axis

32‧‧‧Active line guiding members

34‧‧‧Send hole

35‧‧‧3rd lead section

36‧‧‧4th wire section

37‧‧‧Threader

T‧‧‧ needle thread

Claims (4)

A thread feeding device for a sewing machine includes a first lead portion for inserting a needle thread from a gripper, and a second lead portion for inserting a needle thread from the first lead portion; The wire guiding member inserts the needle thread from the second lead portion; and the swinging balance is provided with a wire feed hole for inserting the needle thread from the movable wire guiding member on the swing distal end side, and is capable of supporting the swing base The swinging shaft around the end side swings up and down, and the movable wire guiding member is configured to be different from the swinging balance, and is provided between the wire feed hole and the second lead portion so as to be movable up and down. Position adjustment. The wire feeding device of the sewing machine according to the first aspect of the invention, wherein the second lead portion is provided between the movable wire guiding member and the first lead portion, and the needle thread inserted through the second lead portion is disposed. Bend into a mountain shape that protrudes upward. The thread feeding device for a sewing machine according to the first or second aspect of the invention, wherein the upper and lower positions of the movable wire guiding member are fixed to the front side of the sewing machine arm portion, except for the retaining frame. Further, a long guide hole is provided in the up-and-down direction, and the mounting bracket of the movable wire guiding member is fixed by inserting a screw that is provided with the long guide hole in the up-and-down direction, so that the screw is along the guide hole The sliding can be performed to adjust the vertical position of the movable wire guiding member. The wire feeding device for a sewing machine according to the third aspect of the invention, wherein the adjusting means of the left and right positions of the movable wire guiding member is fixed by a screw inserted through a long guide hole provided in a left-right direction of the mounting frame. The movable wire guiding member is fixed, and the screw is slid along the vertically extending guide hole to adjust the left and right positions of the movable wire guiding member.