Sewing thread clamping device of sewing machine

Abstract

The utility model discloses a sewing machine sewing thread clamping device which comprises a driving device, a first pull rod, a transmission set, a second pull rod, a thread clamping piece and a fixing block, the driving device is connected with one end of the first pull rod, the other end of the first pull rod is connected with the transmission set, and the transmission set is connected with one end of the second pull rod; a sewing needle hole matched with a sewing machine is formed in the fixed block, and the fixed block is fixedly arranged below a machine needle of the sewing machine; the thread clamping piece comprises a thread clamping connecting part and a clamping part, a rotating shaft is connected between the thread clamping connecting part and the clamping part, the thread clamping connecting part is connected with the other end of the second pull rod, the clamping part is adjacent to the fixing block, and the clamping part rotates around the rotating shaft and abuts against the fixing block to clamp a sewing thread. According to the utility model, the sewing stability is effectively improved, and the sewing off-line and bird nest phenomena are reduced.

Description

Technical Field

[0001] The utility model relates to the field of sewing equipment, in particular to a thread clamping device for a sewing machine. Background Art

[0002] Seam unraveling and bird's nesting are common problems during sewing. They primarily occur on the back of the fabric at the seam's start, where the bobbin thread forms a clump of thread on the fabric, known as a "bird's nest." The primary cause of seam unraveling is improper thread take-up spring pressure. If the spring pressure is too strong, the seam is too tight, making it prone to unraveling at the start. Conversely, if the spring pressure is too weak, the seam is too loose, also causing unraveling. Consequently, current seam unstability is a problem, making unraveling and bird's nesting more common, a serious detriment to the aesthetics and quality of textiles. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a thread clamping device for a sewing machine, which effectively improves the stability of seaming and reduces the phenomenon of thread derailment and bird's nest at seaming.

[0004] To achieve the above-mentioned object, the present invention provides a sewing machine thread clamping device, comprising a driving device, a first pull rod, a transmission group, a second pull rod, a thread clamping piece, and a fixing block, wherein the driving device is connected to one end of the first pull rod, the other end of the first pull rod is connected to the transmission group, and the transmission group is connected to one end of the second pull rod;

[0005] The fixed block is provided with a sewing needle hole that matches the sewing machine and is fixedly arranged below the needle of the sewing machine;

[0006] The wire clamping piece includes a wire clamping connection part and a clamping part, a rotating shaft is connected between the wire clamping connection part and the clamping part, the wire clamping connection part is connected to the other end of the second pull rod, the clamping part is adjacent to the fixed block, and the clamping part rotates around the rotating shaft and abuts against the fixed block to clamp the suture.

[0007] Furthermore, the thread clamping piece is provided with a first through-hole, through which the rotating shaft passes and is fixed to the sewing machine. The length of the clamping portion is greater than the other end. This allows the clamping portion to rotate about the rotating shaft, cooperating with the fixing block to clamp the suture. The length setting can enhance the rotational force of the clamping portion and improve the suture clamping effect.

[0008] Furthermore, the clamping portion includes a first connecting arm and a wrapping arm connected to the first connecting arm, wherein the wrapping arm is an arc structure and matches the outer edge of the fixing block. The arc structure can closely match the fixing block to clamp the suture, achieving better results.

[0009] Furthermore, the driving device includes a driving bracket and an electromagnetic driver installed in the driving bracket, and the electromagnetic driver is fixedly connected to one end of the first pull rod via a connecting piece. The electromagnetic driver has a simple structure and saves costs.

[0010] Furthermore, the first pull rod includes a first connecting portion, a first bending portion, a second connecting portion, a second bending portion, a third bending portion, and a third connecting portion. The two ends of the first connecting portion are respectively fixed to the connecting rod and connected to the first bending portion. The first bending portion is bent downward at 90° and connected to one end of the second connecting portion. The other end of the second connecting portion is connected to the third bending portion. The third bending portion is bent rightward at 90° and connected to one end of the third connecting portion. The other end of the third connecting portion is connected to the transmission group. The arrangement of the first bending portion, the second bending portion, and the third bending portion enables the present invention to adapt to the needs of different locations without affecting the transmission of power.

[0011] Furthermore, the transmission group includes a fixed column, a connecting rod, a driving block, and a driving rod. The fixed column is provided on the sewing machine, and the connecting rod is rotatably sleeved within the fixed column. The upper and lower ends of the connecting rod are connected to the driving block and one end of the driving rod, the other end of the driving block is connected to the first pull rod, and the other end of the driving rod is connected to the second pull rod. The driving block cooperates with the connecting rod to drive the driving rod to rotate, and the transmission performance is stable and not easily affected by the environment, thereby ensuring the stability of the transmission.

[0012] Furthermore, one end of the driver block has a first connection hole, and the end of the first pull rod is connected to a connecting column. The connecting column is inserted into the first connection hole and locked. The other end of the driver block has an opening, which surrounds the connecting rod and is locked with a screw. The provision of the opening allows for faster installation, a simple structure, and low cost.

[0013] Furthermore, the drive rod includes a first connecting end and a second connecting end, and the drive rod tapers gradually from the first connecting end to the second connecting end. The first connecting end is connected to the connecting rod, and the second connecting end is connected to the second pull rod. The second connecting end is larger than the first connecting end, ensuring that the connection between the connecting rod and the second connecting end has sufficient space for assembly and can withstand sufficient impact without easily breaking, thereby ensuring the stability of the overall structure.

[0014] Furthermore, the second pull rod includes a fourth connecting portion, a fourth bending portion, a fifth connecting portion, a fifth bending portion and a sixth connecting portion, the two ends of the fourth connecting portion are respectively connected to the transmission group and the fourth bending portion, the fourth bending portion is bent 90° to the right and connected to one end of the fifth connecting portion, the other end of the fifth connecting portion is connected to the fifth bending portion, the fifth bending portion is bent 90° to the right and connected to the sixth connecting portion, so that the sixth connecting portion and the fourth connecting portion are arranged in parallel. The arrangement of the fourth bending portion and the fifth bending portion can enable the fourth connecting portion and the sixth connecting portion to be arranged in parallel, ensuring the linear transmission of force, and can also adapt to different positions to match the internal structure of the sewing machine, so that the space utilization rate of the arrangement is better and more reasonable.

[0015] Furthermore, the front end of the fixing block is an arc surface, which can be closely contacted with the clamping portion to achieve a better clamping effect on the suture.

[0016] Compared with the prior art, the present invention has the following advantages: the present invention adopts a driving device to perform forward and backward telescopic movements after receiving a driver instruction, thereby pulling the first pull rod forward and backward, and the first pull rod pulls the second pull rod forward and backward through the transmission group, and the second pull rod pulls the thread clamping piece to rotate along the rotating axis, so that the clamping part rotates and cooperates with the fixed block to clamp the suture. In this way, the occurrence of seam derailment and bird's nest phenomenon after the needle rises can be avoided, and the working stability of the sewing machine can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a structural schematic diagram of a thread clamping device for a sewing machine according to the present invention;

[0019] Figure 2 yes Figure 1 A side view schematic diagram of

[0020] Figure 3 yes Figure 1 Schematic top view of

[0021] Figure 4 yes Figure 3 Enlarged schematic diagram of area A in the middle.

[0022] Included in the diagram are:

[0023] 1. Driving device; 11. Driving bracket; 12. Electromagnetic drive; 13. Connecting part; 2. First pull rod; 21. First connecting part; 22. First bending part; 23. Second connecting part; 24. Second bending part; 25. Third connecting part; 26. Third bending part; 3. Transmission group; 31. Fixed column; 32. Connecting rod; 33. Driving block; 331. First connecting hole; 332. Opening; 34. Driving rod; 341. First connecting end; 342. Second connecting end; 4. Second pull rod; 41. Fourth connecting part; 42. Fourth bending part; 43. Fifth connecting part; 44. Fifth bending part; 45. Sixth connecting part; 5. Thread clamping piece; 51. Thread clamping connecting part; 52. Clamping part; 521. First connecting arm; 522. Wrapping arm; 53. Rotating shaft; 6. Fixed block; 61. Sewing needle hole; 62. Arc surface; 7. Needle. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in this embodiment of the present invention to clearly and completely describe the technical solution in this embodiment of the present invention. Obviously, the embodiment described is only one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this utility model.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0027] See also Figures 1 to 4 , an embodiment of the utility model provides a suture clamping device for a sewing machine.

[0028] The sewing machine thread clamping device of this embodiment is as follows Figures 1 to 4 As shown, it includes a driving device 1, a first pull rod 2, a transmission group 3, a second pull rod 4, a wire clamping piece 5 and a fixing block 6;

[0029] The driving device 1 includes a driving bracket 11 and an electromagnetic driver 12 mounted in the driving bracket 11. The electromagnetic driver 12 is a component that drives the electromagnet to move forward and backward by an electromagnetic coil. The electromagnetic driver 12 is fixedly connected to one end of the first pull rod 2 via a connector 13. When the electromagnetic driver 12 is energized, it can reciprocate back and forth, thereby driving the first pull rod 2 to move forward and backward.

[0030] The other end of the first pull rod 2 is connected to the transmission group 3. In this embodiment, the first pull rod 2 includes a first connecting portion 21, a first bending portion 22, a second connecting portion 23, a second bending portion 24 and a third connecting portion 25. The two ends of the first connecting portion 21 are respectively fixed to the connecting rod 32 and connected to the first bending portion 22. The first bending portion 22 is bent downward at 90° and connected to one end of the second connecting portion 23. The other end of the second connecting portion 23 is connected to the third bending portion 26. The third bending portion 26 is bent to the right at 90° and connected to one end of the third connecting portion 25. The other end of the third connecting portion 25 is connected to the transmission group 3. The first bending portion 22 bent toward the second bending portion 24 and downward can enable the first pull rod 2 to adapt to different positions of the sewing machine, thereby improving the space utilization inside the sewing machine. At the same time, it can also ensure that the first connecting portion 21 and the third connecting portion 25 are in a parallel state, thereby ensuring that the horizontal force of the first pull rod 2 is transmitted without deviation.

[0031] The above-mentioned transmission group 3 includes a fixed column 31, a connecting rod 32, a driving block 33 and a driving rod 34. The fixed column 31 is provided on the sewing machine, and the connecting rod 32 can be rotatably sleeved in the fixed column 31. The upper and lower end parts of the connecting rod 32 are connected to the driving block 33 and one end of the driving rod 34, the other end of the driving block 33 is connected to the first pull rod 2, and the other end of the driving rod 34 is connected to the second pull rod 4. The driving block 33 cooperates with the connecting rod 32 to drive the driving rod 34 to rotate. Its transmission performance is stable and not easily affected by the environment, thereby ensuring the stability of the transmission. In order to make the installation of the transmission group 3 more convenient and reduce the overall production cost, a first connecting hole 331 is opened at one end of the driving block 33, and the end of the first pull rod 2 is connected to the connecting column 27, and the connecting column 27 is inserted into the first connecting hole 331 After locking, the other end of the driving block 33 is provided with an opening 332, which wraps the connecting rod 32 and is locked by a screw. When the connecting rod 32 drives the driving rod 34 to rotate, there will be a large torsional force. In order to ensure the force strength of the driving rod 34, the driving rod 34 of this embodiment includes a first connecting end 341 and a second connecting end 342. The driving rod 34 gradually becomes smaller from the first connecting end 341 to the second connecting end 342. The first connecting end 341 is connected to the connecting rod 32, and the second connecting end 342 is connected to the second pull rod 4. The second connecting end 342 is larger than the first connecting end 341, which can ensure that the connection between the connecting rod 32 and the second connecting end 342 has sufficient strength and space for assembly, and can withstand the impact of sufficient force without being easily damaged, thereby ensuring the stability of the overall structural operation;

[0032] The second pull rod 4 includes a fourth connecting portion 41, a fourth bending portion 42, a fifth connecting portion 43, a fifth bending portion 44 and a sixth connecting portion 45. The two ends of the fourth connecting portion 41 are respectively connected to the transmission group 3 and the fourth bending portion 42. The fourth bending portion 42 is bent to the right at 90 degrees and connected to one end of the fifth connecting portion 43. The other end of the fifth connecting portion 43 is connected to the fifth bending portion 44. The fifth bending portion 44 is bent to the right at 90 degrees and connected to the sixth connecting portion 45, so that the sixth connecting portion 45 is arranged in parallel with the fourth connecting portion 41. The arrangement of the fourth bending portion 42 and the fifth bending portion 44 enables the fourth connecting portion 41 and the sixth connecting portion 45 to be arranged in parallel, ensuring the linear transmission of force. At the same time, it can also adapt to different positions to match the internal structure of the sewing machine, making the space utilization rate of the arrangement better and more reasonable.

[0033] The fixing block 6 is provided with a sewing needle hole 61 for cooperating with the sewing machine and is fixedly arranged below the sewing machine needle 7. The front end of the fixing block 6 is a circular arc surface 62. The circular arc surface 62 can better and more tightly abut against the clamping part 52, so that the clamping effect of the suture is better.

[0034] The thread clamping piece 5 includes a thread clamping connection part 51 and a clamping part 52. A rotating shaft 53 is connected between the thread clamping connection part 51 and the clamping part 52. The thread clamping connection part 51 is connected to the other end of the second pull rod 4. The clamping part 52 is adjacent to the fixed block 6. The clamping part 52 rotates around the rotating shaft 53 and abuts against the fixed block 6 to clamp the suture. A first through hole is provided on the thread clamping piece 5, and the rotating shaft 53 passes through the first through hole and is fixed to the sewing machine. The length of the clamping part 52 is greater than the other end, so that the clamping part 52 can rotate around the rotating shaft 53 as the axis, and can cooperate with the fixed block 6 to clamp the suture. The length setting can make the rotation force of the clamping part 52 better and the effect of clamping the suture better. The clamping part 52 includes a first connecting arm 521 and a wrapping arm 522 connected to the first connecting arm 521. The wrapping arm 522 is an arc structure and matches the outer edge of the fixed block 6. The arc structure can closely cooperate with the fixing block 6 to clamp the suture, achieving better results.

[0035] The working principle of the present invention is as follows: the present invention can be directly mounted on the frame of the sewing machine, the fixing block 6 is fixedly arranged below the sewing machine needle 7, so that the sewing needle hole 61 on the fixing block 6 matches the position of the needle 7. When the needle bar reaches the lowest point and then rises to the set position after sewing the first stitch (preset, the second stitch or the third stitch can be set), the electric control sends a signal, the electromagnetic driver 12 drives the connecting member 13 to operate, and drives the driving rod 34 to rotate around the fixed column 31 through the first pull rod 2 and the driving block 33. The driving rod 34 drives the thread clamping piece 5 to rotate around the rotating shaft 53 through the second pull rod 4, as shown in FIG. Figure 4 In the dotted line portion, the clamping portion 52 moves clockwise until it contacts the fixing block 6 and clamps the suture;

[0036] Then, when sewing to the second stitch (preset, the third stitch or the fourth stitch can be set), the needle bar reaches the lowest point and then rises to the set position, the electric control sends a signal again to turn off the power of the electromagnetic drive 12 and return to its original position. Figure 4 In the solid line part, the clamping piece 5 is rotated counterclockwise to the initial position through the intermediate transmission member to complete the entire action, and this reciprocating process can be repeated.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sewing machine thread clamping device, characterized in that: The invention comprises a driving device (1), a first pull rod (2), a transmission group (3), a second pull rod (4), a wire clamp (5) and a fixing block (6), wherein the driving device (1) is connected to one end of the first pull rod (2), the other end of the first pull rod (2) is connected to the transmission group (3), and the transmission group (3) is connected to one end of the second pull rod (4); The fixed block (6) is provided with a sewing needle hole (61) that matches the sewing machine and is fixedly arranged below the sewing machine needle (7); The clamping piece (5) comprises a clamping connection portion (51) and a clamping portion (52), a rotating shaft (53) is connected between the clamping connection portion (51) and the clamping portion (52), the clamping connection portion (51) is connected to the other end of the second pull rod (4), the clamping portion (52) is adjacent to the fixed block (6), and the clamping portion (52) rotates around the rotating shaft (53) and contacts the fixed block (6) to clamp the suture.

2. A sewing machine thread clamping device according to claim 1, characterized in that: A first through hole is provided on the thread clamping piece (5), and the rotating shaft (53) passes through the first through hole and is fixed on the sewing machine. The length of the clamping portion (52) is greater than the other end.

3. A sewing machine thread clamping device according to claim 2, characterized in that: The clamping portion (52) comprises a first connecting arm (521) and a wrapping arm (522) connected to the first connecting arm (521); the wrapping arm (522) is an arc structure and matches the outer edge of the fixing block (6).

4. The thread clamping device for a sewing machine according to claim 1, characterized in that: The driving device (1) comprises a driving bracket (11) and an electromagnetic driver (12) installed in the driving bracket (11); the electromagnetic driver (12) is fixedly connected to one end of the first pull rod (2) via a connecting piece (13).

5. The thread clamping device for a sewing machine according to claim 3, characterized in that: The first pull rod (2) includes a first connecting portion (21), a first bending portion (22), a second connecting portion (23), a second bending portion (24), a third bending portion (26) and a third connecting portion (25). The two ends of the first connecting portion (21) are respectively fixed to the connecting rod (32) and connected to the first bending portion (22). The first bending portion (22) is bent downward at 90° and connected to one end of the second connecting portion (23). The other end of the second connecting portion (23) is connected to the third bending portion (26). The third bending portion (26) is bent rightward at 90° and connected to one end of the third connecting portion (25). The other end of the third connecting portion (25) is connected to the transmission group (3).

6. The thread clamping device for a sewing machine according to claim 1, characterized in that: The transmission group (3) includes a fixed column (31), a connecting rod (32), a driving block (33) and a driving rod (34), wherein the fixed column (31) is arranged on the sewing machine, and the connecting rod (32) can be rotatably sleeved in the fixed column (31), and the upper and lower end portions of the connecting rod (32) are connected to the driving block (33) and one end of the driving rod (34), the other end of the driving block (33) is connected to the first pull rod (2), and the other end of the driving rod (34) is connected to the second pull rod (4).

7. The thread clamping device for a sewing machine according to claim 6, characterized in that: A first connecting hole (331) is provided at one end of the driving block (33), and a connecting column (27) is connected to the end of the first pull rod (2). The connecting column (27) is inserted into the first connecting hole (331) and locked. An opening (332) is provided at the other end of the driving block (33), and the opening (332) wraps around the connecting rod (32) and is locked by a screw.

8. The thread clamping device for a sewing machine according to claim 6, characterized in that: The driving rod (34) comprises a first connecting end (341) and a second connecting end (342), and the driving rod (34) gradually becomes smaller from the first connecting end (341) to the second connecting end (342), the first connecting end (341) is connected to the connecting rod (32), and the second connecting end (342) is connected to the second pull rod (4).

9. The thread clamping device for a sewing machine according to claim 1, characterized in that: The second pull rod (4) includes a fourth connecting portion (41), a fourth bending portion (42), a fifth connecting portion (43), a fifth bending portion (44) and a sixth connecting portion (45). The two ends of the fourth connecting portion (41) are respectively connected to the transmission group (3) and the fourth bending portion (42). The fourth bending portion (42) is bent rightward at 90° and connected to one end of the fifth connecting portion (43). The other end of the fifth connecting portion (43) is connected to the fifth bending portion (44). The fifth bending portion (44) is bent rightward at 90° and connected to the sixth connecting portion (45), so that the sixth connecting portion (45) and the fourth connecting portion (41) are arranged in parallel.

10. The thread clamping device for a sewing machine according to any one of claims 1 to 9, characterized in that: The front end portion of the fixing block (6) is an arc surface (62).

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