Sewing machine

Abstract

The utility model relates to a sewing machine and relates to the field of textile machinery, the sewing machine comprises a sewing table used for placing cloth, a sewing machine head used for sewing the cloth and a thread loosening module used for enabling sewing threads to be in a loose state, the sewing machine head is arranged on the sewing table, and the thread loosening module comprises a thread loosening rod, a thread loosening hook and a driving source; the driving source is arranged in the sewing machine head, an output shaft of the driving source penetrates through the sewing machine head to the outside of the sewing machine head, a connecting rod is fixedly connected to the output shaft of the driving source, the thread loosening rod is hinged to the end, away from the output shaft of the driving source, of the connecting rod, and the thread loosening hook is fixedly connected to the thread loosening rod. When the driving source drives the thread loosening rod to rotate, the thread loosening hook pulls a sewing thread wound on the thread loosening hook. The sewing machine has the advantages that the thread loosening rod is driven by the driving source to pull the sewing thread to the loose state, the sewing thread is prevented from being popped out of a needle hole of the sewing needle during thread trimming, and the sewing convenience of a user using the sewing machine is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile machinery, in particular to a sewing machine. BACKGROUND

[0002] The sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the cloth to be sewn, so as to interweave or sew one or more layers of cloth.

[0003] In the related art, the working principle of the sewing machine is as follows: the sewing thread is arranged on the thread separation module on the sewing machine head, and then the sewing thread is arranged in the needle hole of the sewing needle; the cloth to be sewn is stacked on the sewing table of the sewing machine, so that the needle tip of the sewing needle is aligned with the position to be sewn on the cloth, and then the pedal is stepped to sew the cloth.

[0004] In view of the above related art, the inventor believes that during the use of the sewing machine, after the sewing of the cloth is completed, the sewing thread is usually in a straightened state, and when the sewing thread is cut, the sudden change in stress of the sewing thread is easy to cause the sewing thread to pop out of the needle hole of the sewing machine, and the thread needs to be rethreaded, which is relatively inconvenient, and there is still room for improvement. CONTENT OF THE UTILITY MODEL

[0005] In order to improve the problem that when the sewing thread is cut, the sudden change in stress of the sewing thread is easy to cause the sewing thread to pop out of the needle hole of the sewing machine, and the thread needs to be rethreaded, the present application provides a sewing machine.

[0006] The sewing machine provided by the present application adopts the following technical scheme:

[0007] A sewing machine, comprising a sewing table for placing cloth to be sewn, a sewing machine head for sewing the cloth, and a thread loosening module for making the thread in a relaxed state, the sewing machine head is arranged on the sewing table, the thread loosening module comprises a thread loosening rod, a thread loosening hook and a driving source, the driving source is arranged in the sewing machine head, the output shaft of the driving source penetrates the sewing machine head to the outside of the sewing machine head, a connecting rod is fixedly connected to the output shaft of the driving source, the thread loosening rod is hinged to one end of the connecting rod away from the output shaft of the driving source, and the thread loosening hook is fixedly connected to the thread loosening rod, so that when the driving source drives the thread loosening rod to rotate, the thread loosening hook pulls the sewing thread wound on the thread loosening hook.

[0008] By adopting the technical scheme, after sewing, the thread loosening rod is rotated by the driving source, the thread loosening hook is used to lengthen the sewing thread located at the thread loosening module, the thread loosening hook and the sewing thread are separated when the thread loosening rod moves to the position before being driven by the driving source, the sewing thread is in a relaxed state, compared with the sewing thread being cut in a taut state, the sewing thread in the relaxed state will not be cut to generate a stress mutation, so that the sewing thread will not be bounced out of the needle hole of the sewing needle, repeated threading is avoided, and the convenience of a user in using the sewing machine for sewing is improved.

[0009] Optionally, the thread tensioning rod is fixedly connected to the sewing machine head, a plurality of first threading holes for threading the sewing thread are arranged on the thread tensioning rod, and the plurality of first threading holes are distributed along the length direction of the thread tensioning rod.

[0010] By adopting the technical scheme, the sewing thread is divided by the thread tensioning rod before being threaded on the thread loosening module, the sewing thread is threaded in the first threading holes one by one, the plurality of sewing threads are separated, entanglement between the sewing threads is avoided, and the threading of the sewing thread on the thread loosening module is smooth.

[0011] Optionally, the sewing machine head is provided with a mounting plate fixedly connected to one side of the thread loosening module, a plurality of screw rods for winding the sewing thread are fixedly connected to the mounting plate, a thread clamping assembly is arranged on the screw rod, the thread clamping assembly comprises a compression spring, a limiting knob and two thread clamping plates, the two thread clamping plates are sleeved on the screw rod, the two thread clamping plates cooperate to form a gap for winding the sewing thread, the compression spring is sleeved on the screw rod, the limiting knob is threadedly connected to the screw rod, one end of the compression spring abuts against the thread clamping plate, and the other end of the compression spring abuts against the limiting knob.

[0012] By adopting the technical scheme, the sewing thread is wound in the gap between the two thread clamping plates, the compression spring is compressed by rotating the limiting knob, the spring exerts pressure on the thread clamping plate, the friction force of the sewing thread passing through the thread clamping assembly is controlled, and the sewing thread is not easy to recover after being pulled to the relaxed state by the thread loosening hook, so that the stability of the sewing thread in the relaxed state is improved.

[0013] Optionally, a connecting column is fixedly connected to the connecting rod, a reset plate is rotatably connected to the connecting column, an elastic rope is fixedly connected to the reset plate, and one end of the elastic rope away from the reset plate is fixedly connected to the thread tensioning rod. When the driving source drives the connecting rod to rotate, the elastic rope is in a tension state, so that the connecting rod reversely rotates to the original angle under the action of the elastic rope when the driving force of the driving source is lost.

[0014] By adopting the technical scheme, when the driving source drives the connecting rod to rotate, the elastic rope is in a tension state, the reset plate is subjected to a pulling force away from the sewing table by the elastic rope, at this time, the reset plate is limited by the connecting column, when the driving source no longer drives the connecting rod to rotate, the reset plate no longer moves to the side away from the sewing table under the limitation of the connecting column, the connecting rod rotates with the movement of the reset plate, thereby driving the thread releasing rod to move, and the convenience of the thread releasing rod moving to the position before being driven by the driving source is improved.

[0015] Optionally, the reset plate is provided with a plurality of long waist holes, each of the long waist holes is arranged along the length direction of the reset plate, the plurality of long waist holes are distributed along the length direction of the reset plate, and the plurality of screw rods are correspondingly arranged in the plurality of long waist holes. The reset plate is fixedly connected with a thread releasing block, the thread releasing block is located on the side of the long waist hole away from the sewing table, and the thread releasing block abuts against the abutting position of the two thread clamping plates. When the reset plate is driven by the driving source to move close to the sewing table, the thread releasing block moves to the position between the two thread clamping plates, and the two sides of the thread releasing block abut against the opposite sides of the two thread clamping plates, respectively, and the distance between the two thread clamping plates is increased.

[0016] By adopting the technical scheme, the structure that the screw rod is arranged in the long waist hole enables the reset plate to slide along the length direction of the mounting plate, and the stability of the reset plate mounted on the sewing machine is improved. On the other hand, when the driving source drives the connecting rod to rotate, the reset plate slides to the side close to the sewing table, the thread releasing block is located between the two thread clamping plates, so that the sewing thread is no longer limited by the thread clamping plates, at this time, the thread releasing hook pulls the sewing thread to be relaxed, and the convenience of the thread releasing hook pulling the sewing thread is improved.

[0017] Optionally, the mounting plate is integrally provided with a thread guiding portion on the side away from the thread releasing rod, and the thread guiding portion is provided with a second penetrating hole for the sewing thread to penetrate.

[0018] By adopting the technical scheme, the distance between the thread releasing rod and the thread clamping assembly is shortened by the arrangement of the thread guiding portion, and the entanglement between the sewing threads is further avoided. On the other hand, the sewing thread passes through the thread guiding portion after passing through the thread releasing rod, and then is wound on the thread clamping assembly, the thread guiding portion guides the line route of the sewing thread, and the flow of the sewing thread after penetrating through the first penetrating hole and being wound on the thread clamping assembly is improved.

[0019] Optionally, the side of the sewing machine head provided with the thread releasing module is fixedly connected with a guide pipe for the sewing thread penetrating out of the thread releasing rod to penetrate towards the thread guiding portion.

[0020] By adopting the technical scheme, by sequentially penetrating the sewing thread in the first penetrating hole, the guide pipe and the second penetrating hole, the guide pipe reduces the exposed part of the sewing thread, avoids the interference between the sewing threads, and improves the flow of the sewing thread penetrating the thread releasing rod and the thread guiding portion.

[0021] Optionally, a thread guide is fixedly connected to the mounting plate. The thread guide is located on the side of the slack rod away from the mounting plate. The thread guide has a plurality of first thread holes distributed along the length of the thread guide. The mounting plate has a plurality of second thread holes. The plurality of first thread holes and the plurality of second thread holes are coaxially arranged in a one-to-one correspondence, so that the sewing thread passing through the thread clamping assembly can be sequentially threaded through. When the slack rod is not driven by the driving source, the contact point between the slack hook and the sewing thread is on the axis of the first thread holes and the second thread holes.

[0022] By adopting the above technical solution, the setting of the first thread guide hole and the second thread guide hole ensures that the direction of the part of the sewing thread that needs to be pulled by the slack hook is perpendicular to the moving direction of the slack hook. Compared with the direction of the sewing thread in other directions, when the slack hook pulls the sewing thread to move the same distance, the length of the sewing thread pulled reaches its maximum, thus increasing the length of the sewing thread pulled by the slack hook.

[0023] Optionally, the cable guide frame is provided with a support hole, and the cable slack rod passes through the support hole and abuts against the inner wall of the support hole.

[0024] By adopting the above technical solution, the slack rod is inserted into the support hole and abuts against the inner wall of the support hole. When the drive source drives the connecting rod to rotate, the slack rod slides in the support hole to support the slack rod, thereby improving the stability of the slack rod during the rotation of the connecting rod.

[0025] Optionally, a ring for threading is fixedly connected to the side of the thread guide away from the loosening rod. The ring and the first thread guide hole are coaxially arranged, and the inner diameter of the ring is smaller than the inner diameter of the first thread guide hole.

[0026] By adopting the above technical solution, the sewing thread is sequentially threaded through the first thread guide hole and the ring. The sewing thread abuts against the side of the ring away from the thread guide frame. The curved structure of the ring reduces the friction force on the sewing thread as it slides within the ring, and improves the smoothness of the sewing thread as it passes through the first thread guide hole.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By driving the slack rod through the drive source, the sewing thread is pulled to a slack state, which prevents the sewing thread from popping out of the needle eye when the thread is cut, thus improving the convenience of users when sewing with a sewing machine;

[0029] 2. By threading the sewing threads one by one through the first threading hole, the sewing threads are separated, which avoids tangling between them and improves the smoothness of threading the sewing threads on the loose thread module;

[0030] 3. The friction force of the sewing thread is controlled by the thread clamping assembly, so that the sewing thread is not easy to recover after being pulled to a relaxed state, and the stability of the sewing thread maintained in the relaxed state is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a sewing machine in the embodiment of the present application.

[0032] Figure 2 is a partial view of a thread loosening module and a sewing machine head in the embodiment of the present application.

[0033] Figure 3 is a bottom view of the sewing machine head in the embodiment of the present application.

[0034] Figure 4 is an exploded view of a mounting plate and a thread clamping assembly in the embodiment of the present application.

[0035] Figure 5 is a partial view of a thread separating module and a sewing machine head in the embodiment of the present application.

[0036] Reference signs: 1, sewing table; 2, sewing machine head; 21, mounting plate; 211, thread passing frame; 2111, support hole; 2112, first thread passing hole; 2113, circular ring; 212, second thread passing hole; 213, screw rod; 214, wire guide part; 2141, second through hole; 22, guide pipe; 3, thread loosening module; 31, driving source; 311, connecting rod; 3111, connecting column; 32, thread loosening rod; 33, thread loosening hook; 34, reset plate; 341, elastic rope; 342, long waist hole; 343, thread loosening block; 4, thread separating module; 41, thread lifting rod; 411, first through hole; 42, thread clamping assembly; 421, thread clamping plate; 422, compression spring; 423, limiting knob. DETAILED DESCRIPTION

[0037] The following will be described in detail with reference to the accompanying drawings Figures 1-5 The present application will be further described in detail.

[0038] The embodiment of the present application discloses a sewing machine.

[0039] Reference Figure 1 , the sewing machine comprises a sewing table 1, a sewing machine head 2, a thread loosening module 3 and a thread separating module 4. The sewing table 1 is used for placing the cloth to be sewn. The sewing machine head 2 is installed on the sewing table 1 to sew the cloth. The thread loosening module 3 is installed on the sewing machine head 2 to make the sewing thread change to a relaxed state after sewing. The thread separating module 4 is installed on the side of the sewing machine head 2 with the thread loosening module 3 to avoid entanglement between the sewing threads when multiple sewing threads are used for sewing.

[0040] ReferenceFigure 2 and Figure 3 The thread loosening module 3 comprises a driving source 31, a thread loosening rod 32, a thread loosening hook 33 and a reset plate 34. In the embodiment of the present application, the driving source 31 is a motor drive, and in addition, the driving source 31 can be a pedal drive or other forms of driving mode. The driving source 31 is installed in the sewing machine head 2, and the output shaft of the driving source 31 penetrates the sewing machine head 2 to the outside of the sewing machine head 2. The output shaft of the driving source 31 is fixedly connected with a connecting rod 311, and the thread loosening rod 32 is hinged to one end of the connecting rod 311 away from the output shaft of the driving source 31, so as to rotate with the connecting rod 311 under the driving of the driving source 31. The thread loosening hook 33 is fixedly connected to the thread loosening rod 32 for winding the sewing thread. The connecting rod 311 is fixedly connected with a connecting column 3111, and the reset plate 34 is rotationally connected to the connecting column 3111. The reset plate 34 is fixedly connected with an elastic cord 341, one end of the elastic cord 341 away from the reset plate 34 is fixedly connected to the sewing machine head 2, and the elastic cord 341 is in a tension state to provide a restoring force to the reset plate 34. When the driving source 31 drives the connecting rod 311 to rotate, the connecting rod 311 drives the thread loosening rod 32 and the reset plate 34 to move, and the thread loosening hook 33 lengthens the sewing thread located at the thread loosening module 3. When the driving source 31 stops driving, the connecting rod 311 rotates under the tension of the elastic cord 341 applied to the reset plate 34, the thread loosening rod 32 moves to the position before being driven by the driving source 31 with the rotation of the connecting rod 311, the thread loosening hook 33 and the sewing thread are separated, and at this time, the sewing thread is in a relaxed state.

[0041] Referring to Figure 2The sewing machine head 2 is fixedly connected with a mounting plate 21, and the mounting plate 21 is fixedly connected with a thread passing frame 211. The thread passing frame 211 is located on the side of the thread loosening rod 32 away from the mounting plate 21. The thread passing frame 211 is provided with a supporting hole 2111, and the thread loosening rod 32 is arranged in the supporting hole 2111 and abuts against the inner wall of the supporting hole 2111. When the thread loosening rod 32 rotates with the connecting rod 311, the thread loosening rod 32 slides in the supporting hole 2111 to support the thread loosening rod 32. The thread passing frame 211 is provided with a plurality of first thread passing holes 2112, and the plurality of first thread passing holes 2112 are distributed along the length direction of the thread passing frame 211. The side of the mounting plate 21 close to the thread passing frame 211 is provided with a second thread passing hole 212, and the second thread passing hole 212 and the first thread passing hole 2112 are coaxially arranged and have the same number, so that the thread passing direction formed by the second thread passing hole 212 and the first thread passing hole 2112 is perpendicular to the moving direction of the thread loosening rod 32, thereby making the amplitude of the thread pulled by the thread loosening rod 32 reach the maximum when the thread loosening rod 32 moves. When the thread loosening rod 32 is not driven, the thread loosening hook 33 abuts against the sewing thread, so that the thread loosening hook 33 pulls the sewing thread while the thread loosening rod 32 moves. In order to reduce the friction force of the sewing thread when it passes out of the first thread passing hole 2112, the side of the thread passing frame 211 away from the mounting plate 21 is fixedly connected with a circular ring 2113, and the circular ring 2113 has the same number and is coaxially arranged with the first thread passing hole 2112. The inner diameter of the circular ring 2113 is smaller than the inner diameter of the first thread passing hole 2112, and the sewing thread abuts against the inner wall of the circular ring 2113 and passes out of the first thread passing hole 2112.

[0042] With reference to Figure 2 and Figure 4 The thread separating module 4 comprises a thread tensioning rod 41 and a thread clamping assembly 42. The thread tensioning rod 41 is fixedly connected to the sewing machine head 2, and the thread tensioning rod 41 is provided with a plurality of first penetrating holes 411 arranged along the length direction of the thread tensioning rod 41. The sewing thread is correspondingly arranged in the first penetrating hole 411 to separate the plurality of sewing threads. Since the distance between the position of the thread tensioning rod 41 and the reset plate 34 is greater than the distance between the side of the sewing machine head 2 away from the sewing table 1 and the reset plate 34, the elastic cord 341 can be fixedly connected to the thread tensioning rod 41 to enhance the restoring force of the elastic cord 341 on the reset plate 34.

[0043] With reference to Figure 4The side of the mounting plate 21 is fixedly connected with a plurality of screw rods 213, and the plurality of screw rods 213 are distributed along the length direction of the mounting plate 21. The reset plate 34 is provided with a plurality of long waist holes 342, the number of the long waist holes 342 is the same as that of the screw rods 213, the length direction of each long waist hole 342 is the same as that of the reset plate 34, and the plurality of long waist holes 342 are distributed along the length direction of the reset plate 34. The plurality of screw rods 213 are correspondingly arranged in the long waist holes 342, so as to stabilize the mounting structure of the reset plate 34. The thread clamping assembly 42 comprises a thread clamping plate 421, a compression spring 422 and a limiting knob 423. The number of the thread clamping plate 421 is two, the two thread clamping plates 421 are sequentially arranged on the screw rod 213, and the two thread clamping plates 421 cooperatively form a gap for winding the sewing thread. In order to facilitate the winding of the sewing thread, the side of the two thread clamping plates 421 abutting against each other is arc-shaped. The compression spring 422 is arranged on the screw rod 213, the limiting knob 423 is threadedly connected to the screw rod 213, one end of the compression spring 422 abuts against the thread clamping plate 421, and the other end of the compression spring 422 abuts against the limiting knob 423, so as to adjust the compression degree of the compression spring 422 by rotating the limiting knob 423, thereby controlling the friction force of the sewing thread passing through the gap between the two thread clamping plates 421, and avoiding the sewing thread from being restored to the straight state after being loosened.

[0044] With reference to Figure 2 and Figure 4 , the reset plate 34 is fixedly connected with a thread loosening block 343, and the thread loosening block 343 abuts against the abutting position of the two thread clamping plates 421. When the reset plate 34 is driven, the thread loosening block 343 moves to the gap between the two thread clamping plates 421, and the two sides of the thread loosening block 343 abut against the opposite sides of the two thread clamping plates 421, respectively. At this time, the gap between the two thread clamping plates 421 is enlarged, and the friction force of the sewing thread passing through the gap between the two thread clamping plates 421 is reduced, so as to facilitate the thread loosening hook 33 to pull the sewing thread.

[0045] With reference to Figure 5 , the side of the mounting plate 21 close to the thread tensioning rod 41 is integrally connected with a thread guiding portion 214. The thread guiding portion 214 is provided with a second penetrating hole 2141 for the sewing thread passing out of the first penetrating hole 411 to pass through. In order to guide the line path of the sewing thread passing from the first penetrating hole 411 to the second penetrating hole 2141, the sewing machine head 2 is fixedly connected with a guide pipe 22, one end of the guide pipe 22 is directed to the thread tensioning rod 41, and the other end of the guide pipe 22 is directed to the thread guiding portion 214.

[0046] The implementation principle of the sewing machine in the embodiment of the application is as follows: when the sewing of the cloth is completed, the driving source 31 is started to drive the connecting rod 311 to drive the thread loosening rod 32 and the reset plate 34 to move to the side close to the sewing table 1, the thread loosening block 343 moves to between the two thread clamping plates 421, the gap between the two thread clamping plates 421 becomes larger, and the thread loosening hook 33 moves to the side close to the sewing table 1 along with the thread loosening rod 32, so that the sewing thread at the thread loosening module 3 is lengthened; after the driving force of the driving source 31 is lost, the connecting rod 311 is driven to move to the side away from the sewing table 1 by the pulling force provided by the elastic string 341 of the reset plate 34, the thread loosening rod 32 drives the thread loosening hook 33 to move to the position before being driven, the thread loosening hook 33 and the sewing thread are separated, and the sewing thread is in a relaxed state.

[0047] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A sewing machine characterized by: The utility model provides a sewing machine head (2) is equipped with thread tensioning module (3), thread tensioning module (3) includes driving source (31), thread tensioning lever (32) and thread tensioning hook (33), driving source (31) is equipped in sewing machine head (2), the output shaft of driving source (31) is through sewing machine head (2) to sewing machine head (2) outside, the output shaft of driving source (31) is fixedly connected with connecting rod (311), thread tensioning lever (32) is hinged to the one end of connecting rod (311) away from the output shaft of driving source (31), thread tensioning hook (33) is fixedly connected on thread tensioning lever (32), so that when driving source (31) drives thread tensioning lever (32) rotates, thread tensioning hook (33) pulls the sewing thread that is arranged on thread tensioning hook (33).

2. A sewing machine according to claim 1, characterized in that: The utility model provides a sewing machine head (2) is equipped with thread tensioning module (3), thread tensioning module (3) includes driving source (31), thread tensioning lever (32) and thread tensioning hook (33), driving source (31) is equipped in sewing machine head (2), the output shaft of driving source (31) is through sewing machine head (2) to sewing machine head (2) outside, the output shaft of driving source (31) is fixedly connected with connecting rod (311), thread tensioning lever (32) is hinged to the one end of connecting rod (311) away from the output shaft of driving source (31), thread tensioning hook (33) is fixedly connected on thread tensioning lever (32), so that when driving source (31) drives thread tensioning lever (32) rotates, thread tensioning hook (33) pulls the sewing thread that is arranged on thread tensioning hook (33).

3. A sewing machine according to claim 2, characterised in that: The utility model provides a sewing machine head (2) is equipped with thread tensioning module (3), thread tensioning module (3) includes driving source (31), thread tensioning lever (32) and thread tensioning hook (33), driving source (31) is equipped in sewing machine head (2), the output shaft of driving source (31) is through sewing machine head (2) to sewing machine head (2) outside, the output shaft of driving source (31) is fixedly connected with connecting rod (311), thread tensioning lever (32) is hinged to the one end of connecting rod (311) away from the output shaft of driving source (31), thread tensioning hook (33) is fixedly connected on thread tensioning lever (32), so that when driving source (31) drives thread tensioning lever (32) rotates, thread tensioning hook (33) pulls the sewing thread that is arranged on thread tensioning hook (33).

4. A sewing machine according to claim 3, characterised in that: The utility model provides a sewing machine head (2) is equipped with thread tensioning module (3), thread tensioning module (3) includes driving source (31), thread tensioning lever (32) and thread tensioning hook (33), driving source (31) is equipped in sewing machine head (2), the output shaft of driving source (31) is through sewing machine head (2) to sewing machine head (2) outside, the output shaft of driving source (31) is fixedly connected with connecting rod (311), thread tensioning lever (32) is hinged to the one end of connecting rod (311) away from the output shaft of driving source (31), thread tensioning hook (33) is fixedly connected on thread tensioning lever (32), so that when driving source (31) drives thread tensioning lever (32) rotates, thread tensioning hook (33) pulls the sewing thread that is arranged on thread tensioning hook (33).

5. A sewing machine according to claim 4, characterised in that: The reset plate (34) is provided with a plurality of long waist holes (342), each of which is arranged along the length direction of the reset plate (34), and a plurality of long waist holes (342) are distributed along the length direction of the reset plate (34), a plurality of screw rods (213) are correspondingly arranged in a plurality of long waist holes (342), and the reset plate (34) is fixedly connected with a thread loosening block (343). The thread loosening block (343) is located on the side of the long waist hole (342) away from the sewing table (1), and the thread loosening block (343) abuts against the abutting position of the two thread clamping plates (421). When the reset plate (34) is driven by the driving source (31) to approach the sewing table (1), the thread loosening block (343) moves to between the two thread clamping plates (421), and the two sides of the thread loosening block (343) abut against the opposite sides of the two thread clamping plates (421) correspondingly. The distance between the two thread clamping plates (421) is increased.

6. The sewing machine of claim 3, wherein: The mounting plate (21) is integrally provided with a wire guide portion (214) away from the thread loosening rod (32), and the wire guide portion (214) is provided with a second through hole (2141) for the sewing thread.

7. A sewing machine according to claim 6, characterised in that: The side of the sewing machine head (2) provided with the thread loosening module (3) is fixedly connected with a guide pipe (22) for the sewing thread passing out from the thread tension rod (41) and towards the wire guide portion (214).

8. The sewing machine of claim 3, wherein: The mounting plate (21) is fixedly connected with a thread passing frame (211), and the thread passing frame (211) is located on the side of the thread loosening rod (32) away from the mounting plate (21). The thread passing frame (211) is provided with a plurality of first thread passing holes (2112), and a plurality of first thread passing holes (2112) are distributed along the length direction of the thread passing frame (211). The mounting plate (21) is provided with a plurality of second thread passing holes (212), and a plurality of first thread passing holes (2112) and a plurality of second thread passing holes (212) are coaxially arranged one by one to sequentially pass the sewing thread passing out from the thread clamping assembly (42). When the thread loosening hook (33) and the abutting position of the sewing thread are on the axis of the first thread passing hole (2112) and the second thread passing hole (212), the thread loosening rod (32) is not driven by the driving source (31).

9. A sewing machine according to claim 8, characterised in that: The thread passing frame (211) is provided with a supporting hole (2111), and the thread loosening rod (32) is arranged in the supporting hole (2111) and abuts against the inner wall of the supporting hole (2111).

10. The sewing machine of claim 8, wherein: The side of the thread passing frame (211) away from the thread loosening rod (32) is fixedly connected with a circular ring (2113) for the sewing thread, and the circular ring (2113) and the first thread passing hole (2112) are coaxially arranged. The inner diameter of the circular ring (2113) is smaller than the inner diameter of the first thread passing hole (2112).

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