Tooth rack thread trimming mechanism of sewing machine and sewing machine

Abstract

The utility model relates to a sewing machine tooth frame thread trimming mechanism and a sewing machine, the sewing machine tooth frame thread trimming mechanism comprises a motor assembly, the motor assembly comprises a double-shaft motor, and the double-shaft motor comprises a first driving shaft and a second driving shaft; the tooth frame assembly comprises a tooth frame, a tooth frame shaft structure, a seam distance adjusting transmission structure and a crankshaft structure, the tooth frame is matched with the tooth frame shaft structure, the crankshaft structure is installed on the rotating shuttle shaft structure, the tooth frame shaft structure is connected with the crankshaft structure, and the tooth frame shaft structure is connected with the first driving shaft through the seam distance adjusting transmission structure; and the thread trimming assembly is installed on the rotating shuttle shaft structure, and the thread trimming assembly is matched with the second driving shaft. According to the technical scheme, the problem that in the prior art, a sewing machine is large in size is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular, to a thread cutting mechanism for a sewing machine tooth frame and a sewing machine. Background Art

[0002] A sewing machine is a machine that forms one or more stitches on a sewing material with one or more sewing threads, so as to interweave or sew together one or more layers of sewing materials.

[0003] The sewing work of a sewing machine is mainly completed by the cooperation of a sewing needle, a presser foot and a rotating shuttle. After sewing is completed, a thread cutting action is required. In addition, sometimes it is necessary to adjust the distance of the sewing stitch. Some existing technologies use a manual turning method for adjustment. There are also some existing technologies that use a motor to drive a thread cutting structure for thread cutting, and another motor to drive the tooth frame shaft to rotate a certain angle to adjust the sewing distance of the sewing thread. In this way, the two motors respectively drive the thread cutting structure and the tooth frame shaft structure, resulting in a relatively large volume of the sewing machine. Utility Model Content

[0004] The present application provides a thread cutting mechanism for a sewing machine tooth frame and a sewing machine to solve the problem of the relatively large volume of the sewing machine in the prior art.

[0005] According to a thread cutting mechanism for a sewing machine tooth frame provided by the present application, it includes: a motor assembly, the motor assembly includes a dual-axis motor, and the dual-axis motor includes a first drive shaft and a second drive shaft; a tooth frame assembly, the tooth frame assembly includes a tooth frame, a tooth frame shaft structure, a stitch distance adjustment transmission structure and a crankshaft structure, the tooth frame is matched with the tooth frame shaft structure, the crankshaft structure is installed on the rotating shuttle shaft structure, the tooth frame shaft structure is connected to the crankshaft structure, and the tooth frame shaft structure is connected to the first drive shaft through the stitch distance adjustment transmission structure; a thread cutting assembly, the thread cutting assembly is installed on the rotating shuttle shaft structure, and the thread cutting assembly is matched with the second drive shaft.

[0006] Further, the thread cutting assembly includes a thread cutting transmission structure and a thread cutting structure, the thread cutting structure is rotatably sleeved on the rotating shuttle shaft structure, and the second drive shaft is connected to the second drive shaft through the thread cutting transmission structure.

[0007] Further, the thread cutting transmission structure includes a first gear, a rack, a rack limiting frame, a second gear, a first rotating shaft, a main transmission rod, a first transmission rod, and a second transmission rod. The thread cutting structure includes a first thread cutting arm and a second thread cutting arm. The first gear is arranged on the second driving shaft and meshes with the rack. The rack is movably arranged on the rack limiting frame. The second gear meshes with the rack. Both the second gear and the main transmission rod are arranged on the first rotating shaft. The first end of the first transmission rod is connected to the first end of the main transmission rod. The second end of the first transmission rod is connected to the first end of the first thread cutting arm. The first end of the second transmission rod is connected to the second end of the main transmission rod. The second end of the second transmission rod is connected to the first end of the first thread cutting arm. The second ends of the first thread cutting arm and the second thread cutting arm have a thread cutting state of approaching each other or a state of waiting for thread cutting of moving away from each other.

[0008] Further, the first end of the first thread cutting arm has a first collar. The first collar of the first thread cutting arm is rotatably sleeved on the sleeve of the rotating shuttle shaft structure. The second end of the first thread cutting arm has a first blade. The first end of the second thread cutting arm has a second collar. The second collar of the second thread cutting arm is rotatably sleeved on the sleeve of the rotating shuttle shaft structure. The second end of the second thread cutting arm has a second blade. The first blade and the second blade are arranged facing each other.

[0009] Further, the stitch pitch adjustment transmission structure includes a third transmission rod, a fourth transmission rod, a fifth transmission rod, and a sixth transmission rod. The first end of the third transmission rod is connected to the first driving shaft. The second end of the third transmission rod is rotatably connected to the first end of the fourth transmission rod. The second end of the fourth transmission rod is rotatably connected to the first end of the fifth transmission rod. The second end of the fifth transmission rod is rotatably connected to the first end of the sixth transmission rod. The second end of the sixth transmission rod is connected to the bracket shaft structure.

[0010] Further, the crankshaft structure includes a crankshaft, a first connecting rod, a second connecting rod, and a fastener. The crankshaft is sleeved on the rotating shuttle shaft structure. The first end of the first connecting rod is sleeved on the outer circumference of the crankshaft. The second end of the first connecting rod is rotatably connected to the first end of the second connecting rod. The second end of the second connecting rod structure is rotatably connected to the fastener. The fastener is installed on the bracket shaft structure.

[0011] Further, the second end of the six transmission rod is rotatably connected to the first end of the second connecting rod.

[0012] Further, the middle of the fifth transmission rod is rotatably arranged on the bracket.

[0013] Further, the fifth transmission rod includes a first rod arm, a second rod arm, and a connecting arm. The two ends of the connecting arm are respectively connected to the first end of the first rod arm and the first end of the second rod arm. The corresponding position of the connecting arm is the first end of the fifth transmission rod. The middle parts of the first rod arm and the second rod arm are both rotatably connected to the bracket. The second ends of the first rod arm and the second rod arm are both rotatably connected to the first end of the sixth transmission rod. The length of the sixth transmission rod is less than the distance between the first end of the sixth transmission rod and the connecting arm.

[0014] According to another aspect of the present application, there is also provided a sewing machine, which includes a sewing machine main body and a sewing machine tooth frame thread cutting mechanism arranged on the sewing machine main body. The sewing machine tooth frame thread cutting mechanism is the above-mentioned sewing machine tooth frame thread cutting mechanism.

[0015] Applying the technical solution of the present application, the first drive shaft of the dual-axis motor drives the tooth frame assembly, and the second drive shaft of the dual-axis motor drives the thread cutting assembly. In this way, the same motor can drive the tooth frame assembly and the thread cutting assembly, which is more compact than the structure in the prior art where one motor drives the tooth frame assembly and another motor drives the thread cutting assembly, and occupies a smaller space volume. The technical solution of the present application effectively solves the problem of the large volume of the sewing machine in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0018] Figure 1 Shows a three-dimensional structural schematic diagram of the sewing machine tooth frame thread cutting mechanism according to an embodiment of the present application;

[0019] Figure 2 Shows Figure 1 A partial three-dimensional structural schematic diagram of the sewing machine tooth frame thread cutting mechanism;

[0020] Figure 3 Shows Figure 2 Another three-dimensional structural schematic diagram of the sewing machine tooth frame thread cutting mechanism from another angle.

[0021] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0022] 10. Motor assembly; 11. Biaxial motor; 111. First drive shaft; 112. Second drive shaft; 20. Yoke assembly; 21. Yoke; 22. Yoke shaft structure; 23. Stitch pitch adjustment transmission structure; 231. Third transmission rod; 232. Fourth transmission rod; 233. Fifth transmission rod; 234. Sixth transmission rod; 24. Crankshaft structure; 241. Crankshaft; 242. First connecting rod; 243. Second connecting rod; 244. Fastener; 30. Thread cutting assembly; 31. Thread cutting transmission structure; 311. First gear; 312. Rack; 313. Rack limit frame; 314. Second gear; 315. First rotating shaft; 316. Main transmission rod; 317. First transmission rod; 318. Second transmission rod; 32. Thread cutting structure; 321. First thread cutting arm; 322. Second thread cutting arm. Detailed implementation manners

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] It should be pointed out that the following detailed description is exemplary and is intended to provide further illustration of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0025] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" and the like may be used herein to describe the spatial positional relationship between one device or feature and other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." may include both the orientation of "above..." and "below...". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding explanations should be made for the spatial relative descriptions used herein.

[0026] As Figures 1 to 3As shown in the figure, the thread trimming mechanism of the sewing machine bracket in this embodiment includes: a motor assembly 10, a bracket assembly 20, and a thread trimming assembly 30. The motor assembly 10 includes a dual-axis motor 11, and the dual-axis motor 11 includes a first drive shaft 111 and a second drive shaft 112. The bracket assembly 20 includes a bracket 21, a bracket shaft structure 22, a stitch pitch adjustment transmission structure 23, and a crankshaft structure 24. The bracket 21 cooperates with the bracket shaft structure 22. The crankshaft structure 24 is installed on the rotating hook shaft structure. The bracket shaft structure 22 is connected to the crankshaft structure 24, and the bracket shaft structure 22 is connected to the first drive shaft 111 through the stitch pitch adjustment transmission structure 23. The thread trimming assembly 30 is installed on the rotating hook shaft structure, and the thread trimming assembly 30 cooperates with the second drive shaft 112.

[0027] Applying the technical solution of this embodiment, the first drive shaft 111 of the dual-axis motor 11 drives the bracket assembly 20, and the second drive shaft 112 of the dual-axis motor 11 drives the thread trimming assembly 30. In this way, the same motor can drive the bracket assembly 20 and the thread trimming assembly 30. Compared with the structure in the prior art where one motor drives the bracket assembly 20 and another motor drives the thread trimming assembly 30, it is more compact and occupies a smaller space volume. The technical solution of this embodiment effectively solves the problem of the large volume of the sewing machine in the prior art.

[0028] The rotating hook shaft structure of this embodiment includes a rotating hook shaft and a rotating hook shaft sleeve, and the rotating hook shaft sleeve is sleeved on the circumferential outer side of the rotating hook shaft.

[0029] As Figure 2 shown, in the technical solution of this embodiment, the thread trimming assembly 30 includes a thread trimming transmission structure 31 and a thread trimming structure 32. The thread trimming structure 32 is rotatably sleeved on the rotating hook shaft structure, and the second drive shaft 112 is connected to the second drive shaft 112 through the thread trimming transmission structure 31. The thread trimming structure 32 is installed and constrained by means of the rotating hook shaft structure, and such a structure is compact and does not require other parts to be reset. The thread trimming structure 32 is driven through the thread trimming transmission structure 31, and such a setting position is relatively flexible.

[0030] As Figure 2 and Figure 3As shown, in the technical solution of this embodiment, the wire cutting transmission structure 31 includes a first gear 311, a rack 312, a rack limiting frame 313, a second gear 314, a first rotating shaft 315, a main transmission rod 316, a first transmission rod 317, and a second transmission rod 318. The wire cutting structure 32 includes a first wire cutting arm 321 and a second wire cutting arm 322. The first gear 311 is arranged on the second driving shaft 112 and meshes with the rack 312. The rack 312 can be movably arranged on the rack limiting frame 313. The second gear 314 meshes with the rack 312. The second gear 314 and the main transmission rod 316 are both arranged on the first rotating shaft 315. The first end of the first transmission rod 317 is connected to the first end of the main transmission rod 316. The second end of the first transmission rod 317 is connected to the first end of the first wire cutting arm 321. The first end of the second transmission rod 318 is connected to the second end of the main transmission rod 316. The second end of the second transmission rod 318 is connected to the first end of the first wire cutting arm 321. The second end of the first wire cutting arm 321 and the second end of the second wire cutting arm 322 have a wire cutting state of approaching each other or a state of waiting for wire cutting of moving away from each other. The transmission modes of the first gear 311, the rack 312, and the second gear 314 are relatively stable. The setting of the rack limiting frame 313 enables the rack 312 to move along a predetermined track, and the rack 312 moves linearly along the length direction. When working, the first gear 311 drives the rack 312 to move linearly. The linear movement of the rack 312 drives the second gear 314 to rotate. The rotation of the second gear 314 drives the first rotating shaft 315 to rotate. The rotation of the first rotating shaft 315 drives the main transmission rod 316 to swing by a certain angle around the axis of the first rotating shaft 315. The swing of the main transmission rod 316 drives the first transmission rod 317 and the second transmission rod 318 to perform a combined movement of rotation and linear movement. In this way, the first wire cutting arm 321 and the second wire cutting arm 322 switch between the wire cutting state and the state of waiting for wire cutting. It should be noted that the second gear 314 drives the first rotating shaft 315 to rotate, and the first rotating shaft 315 drives the main transmission rod 316 to rotate. The second gear 314 and the first rotating shaft 315 can be connected by a fixing pin or interference fit. The main transmission rod 316 and the first rotating shaft 315 are connected by a fixing pin. It is also possible to use other connection methods. The first ends of the first transmission rod 317 and the second transmission rod 318 are respectively located on both sides of the first rotating shaft 315. Such a structure is more compact and the movement is more reasonable.

[0031] As Figure 2 and Figure 3As shown, in the technical solution of this embodiment, the first end of the first thread cutting arm 321 has a first collar, and the first collar of the first thread cutting arm 321 is rotatably sleeved on the sleeve of the rotary hook shaft structure. The second end of the first thread cutting arm 321 has a first cutting edge. The first end of the second thread cutting arm 322 has a second collar, and the second collar of the second thread cutting arm 322 is rotatably sleeved on the sleeve of the rotary hook shaft structure. The second end of the second thread cutting arm 322 has a second cutting edge, and the first cutting edge and the second cutting edge are arranged facing each other. The above structure has relatively good operating reliability and is not prone to the situation of the sewing thread not being cut. It should be noted that the rack limiting frame 313 is a hollow sleeve, the rack 312 can be horizontally located in the hollow sleeve, the upper part of the hollow sleeve has an avoidance opening, and the first gear 311 is engaged with the rack 312 through the avoidance opening, and such a structure is compact.

[0032] As Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, the stitch pitch adjustment transmission structure 23 includes a third transmission rod 231, a fourth transmission rod 232, a fifth transmission rod 233, and a sixth transmission rod 234. The first end of the third transmission rod 231 is connected to the first drive shaft 111, the second end of the third transmission rod 231 is rotatably connected to the first end of the fourth transmission rod 232, the second end of the fourth transmission rod 232 is rotatably connected to the first end of the fifth transmission rod 233, the second end of the fifth transmission rod 233 is rotatably connected to the first end of the sixth transmission rod 234, and the second end of the sixth transmission rod 234 is connected to the tooth frame shaft structure 22. The above structure makes the setting more flexible, that is, by using the limited space, the layout of the third transmission rod 231, the fourth transmission rod 232, the fifth transmission rod 233, and the sixth transmission rod 234 can achieve the function of adjusting the feeding distance once. It should be noted that the stitch pitch adjustment transmission structure 23 can also play a role in adjusting the feeding direction of the feed dog. By rotating the first drive shaft 111, the tooth frame shaft structure 22 is rotated to the balanced position, and the feed dog can feed in the opposite direction. The farther away from the balanced position, the greater the feeding distance at one time, that is, the looser the sewing. The closer to the balanced position, the smaller the feeding distance at one time, that is, the tighter the sewing. The first end of the third transmission rod 231 rotates together with the first drive shaft 111, and it is possible to use an interference fit or a pin shaft connection between the third transmission rod 231 and the first drive shaft 111.

[0033] As Figure 2 and Figure 3As shown, in the technical solution of this embodiment, the crankshaft structure 24 includes a crankshaft 241, a first connecting rod 242, a second connecting rod 243, and a fastener 244. The crankshaft 241 is sleeved on the rotary hook shaft structure. The first end of the first connecting rod 242 is sleeved on the circumferential outer side of the crankshaft 241. The second end of the first connecting rod 242 is rotatably connected to the first end of the second connecting rod 243. The second end of the second connecting rod 243 is rotatably connected to the fastener 244. The fastener 244 is installed on the bracket shaft structure 22. The above structure is reasonably arranged and the transmission is stable. It should be noted that the bracket shaft structure 22 includes two bracket shafts, and the two bracket shafts are respectively located on both sides of the rotary hook shaft structure. One of the bracket shafts is connected to the rotary hook shaft through the fastener 244, the second connecting rod 243, the first connecting rod 242, and the crankshaft 241. The other bracket shaft is in spline fit with the spline on the rotary hook shaft of the rotary hook shaft structure. The first end of the third connecting rod is rotatably sleeved on the spline bushing, and the second end of the third connecting rod is rotatably connected to the fastener connected to the bracket shaft.

[0034] As Figure 3 shown, in the technical solution of this embodiment, the second end of the sixth transmission rod 234 is rotatably connected to the first end of the second connecting rod 243. This makes the structure more compact. After the forward and reverse rotation changes of the bracket shaft structure 22 and the change of the feeding distance meet the requirements, the first drive shaft 111 can swing back by a certain angle. In this way, when the rotary hook shaft structure drives the bracket shaft structure 22 to feed the cloth, it will not be interfered by the first drive shaft 111.

[0035] As Figure 2 and Figure 3 shown, in the technical solution of this embodiment, the middle part of the fifth transmission rod 233 is rotatably arranged on the bracket. This makes good use of the structure of the fifth transmission rod 233 itself, enabling the fifth transmission rod 233 to transmit the acting force through swinging.

[0036] As Figure 2 and Figure 3As shown, in the technical solution of this embodiment, the fifth transmission rod 233 includes a first rod arm, a second rod arm, and a connecting arm. The two ends of the connecting arm are respectively connected to the first end of the first rod arm and the first end of the second rod arm. The corresponding position of the connecting arm is the first end of the fifth transmission rod 233. The middle parts of the first rod arm and the second rod arm are both rotatably connected to the bracket. The second ends of the first rod arm and the second rod arm are both rotatably connected to the first end of the sixth transmission rod 234. The length of the sixth transmission rod 234 is less than the distance between the first end of the sixth transmission rod 234 and the connecting arm. The above structure operates relatively smoothly, the force is relatively uniform, and the structure is relatively compact. It should be noted that the sixth transmission rod 234 is two, respectively on the inner sides of the first rod arm and the second rod arm. The crankshaft rotates with the rotating hook shaft structure, and the fastener is fixed on the bracket shaft through a fastener. The second drive shaft 112 is located outside the first drive shaft 111, and the length of the first drive shaft 111 protruding from the dual-axis motor 11 is greater than the length of the first drive shaft 111 protruding from the dual-axis motor 11

[0037] According to another aspect of the present application, a sewing machine is also provided. The sewing machine includes a sewing machine main body and a sewing machine bracket thread cutting mechanism provided on the sewing machine main body. The sewing machine bracket thread cutting mechanism is the above-mentioned sewing machine bracket thread cutting mechanism. The sewing machine of the present application has a compact structure and occupies a relatively small space volume. It should be noted that the head device of the sewing machine of the present application has an independent motor drive, and the rotating hook shaft structure has another independent motor drive. In this way, the length of the transmission shaft of the sewing machine needle is greatly reduced, and the rotating hook shaft structure of the rotating hook shaft can be greatly shortened, that is, the deflection deformation of the transmission shaft of the sewing machine needle and the rotating hook shaft of the rotating hook shaft structure is relatively small, and the operation accuracy of the sewing machine of the present application is higher.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented, for example, in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0040] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A sewing machine rack thread trimming mechanism, characterized in that, Comprising: A motor assembly (10), the motor assembly (10) includes a biaxial motor (11), the biaxial motor (11) includes a first drive shaft (111) and a second drive shaft (112); A bracket assembly (20), the bracket assembly (20) includes a bracket (21), a bracket shaft structure (22), a stitch pitch adjustment transmission structure (23) and a crankshaft structure (24), the bracket (21) cooperates with the bracket shaft structure (22), the crankshaft structure (24) is installed on the rotary hook shaft structure, the bracket shaft structure (22) is connected to the crankshaft structure (24), and the bracket shaft structure (22) is connected to the first drive shaft (111) through the stitch pitch adjustment transmission structure (23); A thread cutting assembly (30), the thread cutting assembly (30) is installed on the rotary hook shaft structure, and the thread cutting assembly (30) cooperates with the second drive shaft (112).

2. The thread trimming mechanism for the sewing machine tooth rest according to claim 1, characterized in that The thread cutting assembly (30) includes a thread cutting transmission structure (31) and a thread cutting structure (32), the thread cutting structure (32) is rotatably sleeved on the rotary hook shaft structure, and the second drive shaft (112) is connected to the second drive shaft (112) through the thread cutting transmission structure (31).

3. The thread cutting mechanism of the sewing machine tooth rest according to claim 2, characterized in that, The thread cutting transmission structure (31) includes a first gear (311), a rack (312), a rack limit frame (313), a second gear (314), a first rotating shaft (315), a main transmission rod (316), a first transmission rod (317) and a second transmission rod (318), the thread cutting structure (32) includes a first thread cutting arm (321) and a second thread cutting arm (322), the first gear (311) is arranged on the second drive shaft (112) and meshes with the rack (312), the rack (312) is movably arranged on the rack limit frame (313), the second gear (314) meshes with the rack (312), the second gear (314) and the main transmission rod (316) are both arranged on the first rotating shaft (315), the first end of the first transmission rod (317) is connected to the first end of the main transmission rod (316), the second end of the first transmission rod (317) is connected to the first end of the first thread cutting arm (321), the first end of the second transmission rod (318) is connected to the second end of the main transmission rod (316), the second end of the second transmission rod (318) is connected to the first end of the first thread cutting arm (321), and the second end of the first thread cutting arm (321) and the second end of the second thread cutting arm (322) have a thread cutting state of approaching each other or a state of waiting for thread cutting of moving away from each other.

4. The thread trimming mechanism of the sewing machine tooth rest according to claim 3, characterized in that, The first end of the first thread cutting arm (321) has a first collar, the first collar of the first thread cutting arm (321) is rotatably sleeved on the sleeve of the rotating shuttle shaft structure, the second end of the first thread cutting arm (321) has a first blade, the first end of the second thread cutting arm (322) has a second collar, the second collar of the second thread cutting arm (322) is rotatably sleeved on the sleeve of the rotating shuttle shaft structure, the second end of the second thread cutting arm (322) has a second blade, and the first blade and the second blade are arranged facing each other.

5. The thread cutting mechanism of the sewing machine tooth rest according to claim 1, wherein The stitch pitch adjustment transmission structure (23) includes a third transmission rod (231), a fourth transmission rod (232), a fifth transmission rod (233) and a sixth transmission rod (234). The first end of the third transmission rod (231) is connected to the first drive shaft (111), the second end of the third transmission rod (231) is rotatably connected to the first end of the fourth transmission rod (232), the second end of the fourth transmission rod (232) is rotatably connected to the first end of the fifth transmission rod (233), the second end of the fifth transmission rod (233) is rotatably connected to the first end of the sixth transmission rod (234), and the second end of the sixth transmission rod (234) is connected to the tooth frame shaft structure (22).

6. The thread trimming mechanism of the sewing machine tooth rest according to claim 5, characterized in that, The crankshaft structure (24) includes a crankshaft (241), a first connecting rod (242), a second connecting rod (243) and a fastener (244). The crankshaft (241) is sleeved on the rotating shuttle shaft structure. The first end of the first connecting rod (242) is sleeved on the outer circumference of the crankshaft (241). The second end of the first connecting rod (242) is rotatably connected to the first end of the second connecting rod (243). The second end of the second connecting rod (243) is rotatably connected to the fastener (244), and the fastener (244) is installed on the tooth frame shaft structure (22).

7. The thread cutting mechanism for the sewing machine tooth rest according to claim 6, characterized in that, The second end of the sixth transmission rod (234) is rotatably connected to the first end of the second connecting rod (243).

8. The thread trimming mechanism for the sewing machine tooth rest according to claim 5, characterized in that, The middle part of the fifth transmission rod (233) is rotatably arranged on the bracket.

9. The thread cutting mechanism of the sewing machine tooth rest according to claim 5, wherein The fifth transmission rod (233) includes a first rod arm, a second rod arm and a connecting arm. The two ends of the connecting arm are respectively connected to the first end of the first rod arm and the first end of the second rod arm. The corresponding position of the connecting arm is the first end of the fifth transmission rod (233). The middle parts of the first rod arm and the second rod arm are both rotatably connected to the bracket. The second ends of the first rod arm and the second rod arm are both rotatably connected to the first end of the sixth transmission rod (234), and the length of the sixth transmission rod (234) is less than the distance between the first end of the sixth transmission rod (234) and the connecting arm.

10. A sewing machine, characterized in that, The sewing machine includes a sewing machine main body and a sewing machine tooth frame thread cutting mechanism arranged on the sewing machine main body, and the sewing machine tooth frame thread cutting mechanism is the sewing machine tooth frame thread cutting mechanism according to any one of claims 1 to 9.

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