Thread trimming device and sewing machine with same

Abstract

The utility model provides a thread trimming device and a sewing machine with the same, the thread trimming device is used for being arranged below a machine needle of the sewing machine, and the thread trimming device comprises a base with a threading hole; the fixed cutter assembly is arranged on the base, and the fixed cutter assembly is provided with a fixed cutter edge; the wire clamping assembly is arranged on the base; the movable cutter assembly is arranged on the base, and the movable cutter assembly is provided with a wire passing hole and a movable cutter edge; wherein the movable cutter assembly is provided with an initial position, a thread clamping position and a thread trimming position, and when the movable cutter assembly is located at the initial position, the thread passing hole is located below the threading hole so that a machine needle and a sewing thread can penetrate through the thread passing hole; when the movable cutter assembly is located at the thread clamping position, the movable cutter assembly makes contact with the thread clamping assembly so as to clamp a sewing thread. When the movable cutter assembly is located at the thread cutting position, the fixed cutter edge is meshed with the movable cutter edge so as to cut off sewing threads. The cloth thread residue processing device effectively solves the problem that in the prior art, the efficiency of processing cloth thread residues by workers is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, specifically, relate to a thread cutting device and have its sewing machine. BACKGROUND

[0002] At present, as the main processing equipment of sewing industry, the performance of sewing machine can affect the quality and production speed of production products. When the sewing machine starts to sew the cloth, a thread end is usually left at the needle eye, thereby reducing the situation that the sewing thread falls off from the needle, and ensuring the stability and continuity of the sewing stitch. However, with the continuous sewing of the sewing machine on the cloth, the thread end left at the starting position is easy to wind and form a bird nest-like thread ball, which not only affects the appearance of the cloth, but also easily increases the difficulty of subsequent processes.

[0003] In the prior art, the staff usually cuts the thread end left on the cloth after the sewing of the sewing machine is completed, so as to ensure the appearance of the cloth.

[0004] However, the manual cutting of the thread end of the cloth easily increases the labor intensity of the staff and reduces the work efficiency of the staff. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a thread cutting device and a sewing machine with the same, so as to solve the problem of low efficiency of the staff in handling the thread end of the cloth in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a thread cutting device is provided, which is arranged below the needle of the sewing machine, and the thread cutting device comprises: a base having a threading hole; a fixed knife assembly arranged on the base, the fixed knife assembly having a fixed knife edge; a thread clamping assembly arranged on the base; and a movable knife assembly arranged on the base, the movable knife assembly having a threading hole and a movable knife edge; wherein the movable knife assembly has an initial position, a thread clamping position and a thread cutting position, when the movable knife assembly is in the initial position, the threading hole is located below the threading hole for the needle and the sewing thread to pass through, when the movable knife assembly is in the thread clamping position, the movable knife assembly is in contact with the thread clamping assembly to clamp the sewing thread, and when the movable knife assembly is in the thread cutting position, the fixed knife edge is engaged with the movable knife edge to cut the sewing thread.

[0007] Further, the thread cutting device further comprises a driving assembly arranged on the base and drivingly connected with the movable knife assembly, so as to drive the movable knife assembly to switch between the initial position, the thread clamping position and the thread cutting position.

[0008] Further, the movable knife assembly comprises: a receiving structure arranged on the base; and a contact structure arranged on the receiving structure, the contact structure having the threading hole and the movable knife edge; wherein the driving assembly is drivingly connected with the receiving structure, so as to drive the receiving structure to swing the contact structure along a preset track.

[0009] Further, the thread clamping assembly comprises a fixing structure arranged on the base, and a thread clamping structure arranged on the fixing structure, the thread clamping structure being plate-shaped and comprising a transition part and a thread clamping part connected to each other, the contact structure being fitted to the thread clamping part through the transition part, wherein at least part of the transition part is arranged in an arc shape.

[0010] Further, the fixed knife assembly comprises a bearing structure arranged on the fixing structure, and a fixed knife structure arranged on the bearing structure, the fixed knife structure having a fixed knife edge, wherein the fixed knife structure is located above the thread clamping structure, and at least part of the fixed knife structure and at least part of the thread clamping structure surround to form a thread shearing space for accommodating at least part of the contact structure.

[0011] Further, the thread shearing device further comprises a transmission assembly, the transmission assembly comprising a rotating structure, the driving assembly being drivingly connected to the rotating structure to drive the rotating structure to rotate, and a transmission structure, one end of the transmission structure being rotatably connected to the rotating structure, and the other end of the transmission structure being connected to the bearing structure, wherein in the process of rotation of the rotating structure, the transmission structure drives the bearing structure to swing.

[0012] Further, the driving assembly has an output shaft, the rotating structure comprising a clamping structure comprising at least two clamping pieces, the at least two clamping pieces surrounding to form a clamping space, the clamping space being adjustably arranged for clamping the output shaft, and a main body structure arranged on the clamping structure, one end of the main body structure away from the clamping structure being connected to the transmission structure.

[0013] Further, the base has a bearing recess, and at least part of the transmission structure is movably arranged in the bearing recess.

[0014] Further, the thread shearing device further comprises a collecting assembly arranged on the base, the collecting assembly having a collecting opening and a collecting cavity in communication with each other, the collecting opening being located below the thread clamping assembly, so that the sheared sewing thread enters the collecting cavity through the collecting opening.

[0015] According to another aspect of the present application, a sewing machine is provided, the sewing machine comprising the above-mentioned thread shearing device.

[0016] The technical scheme of the utility model is used to set the thread cutting device below the needle of the sewing machine, the base of the thread cutting device has a threading hole. The fixed knife assembly is arranged on the base and has a fixed knife edge. The thread clamping assembly is arranged on the base. The movable knife assembly is arranged on the base and has a threading hole and a movable knife edge. The movable knife assembly has an initial position, a thread clamping position and a thread cutting position. When the movable knife assembly is in the initial position, the threading hole is below the threading hole for the needle and the sewing thread to pass through. When the movable knife assembly is in the thread clamping position, the movable knife assembly is in contact with the thread clamping assembly to clamp the sewing thread. When the movable knife assembly is in the thread cutting position, the fixed knife edge is engaged with the movable knife edge to cut the sewing thread. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description, explain the present application. The present application is illustrated by the accompanying drawings and the description thereof, but is not limited by the same. In the drawings:

[0018] Figure 1 An overall structure perspective view of the thread cutting device according to the embodiment of the utility model is shown;

[0019] Figure 2 An exploded view of the structure of the thread cutting device in Figure 1 is shown;

[0020] Figure 3 A local enlarged view of Figure 2 is shown;

[0021] Figure 4 A partial exploded view of Figure 1 is shown;

[0022] Figure 5 A movable knife assembly perspective view of the thread cutting device in Figure 1 is shown;

[0023] Figure 6 A fixed knife assembly perspective view of the thread cutting device in Figure 1 is shown;

[0024] Figure 7 A thread clamping assembly perspective view of the thread cutting device in Figure 1 is shown;

[0025] Figure 8 A handset assembly perspective view of the thread cutting device in Figure 1 is shown.

[0026] In the above drawings, the following reference signs are used:

[0027] 10, base; 11, needle plate structure; 111, threading hole; 12, bearing recess;

[0028] 20, fixed knife assembly; 21, bearing structure; 22, fixed knife structure; 221, fixed knife edge;

[0029] 30, thread clamping assembly; 31, fixed structure; 32, thread clamping structure; 321, transition part; 322, thread clamping part;

[0030] 40, moving knife assembly; 41, bearing structure; 42, contact structure; 421, thread passing hole; 422, moving knife edge;

[0031] 50, driving assembly; 51, output shaft;

[0032] 60, transmission assembly; 61, rotating structure; 611, clamping piece; 612, main body structure; 62, transmission structure;

[0033] 70, collection assembly; 71, collection opening; 72, collection cavity;

[0034] 80, thread cutting device;

[0035] 90, rotary shuttle device. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0038] In the present application, unless otherwise specified, the orientation words such as "up, down" are generally directed to the direction shown in the drawings, or are directed to the vertical, perpendicular or gravity direction; similarly, for the convenience of understanding and description, "left, right" is generally directed to the left and right shown in the drawings; "inner, outer" refers to the inner and outer relative to the contour of each structure, but the above orientation words are not used to limit the present application.

[0039] In order to solve the problem of low efficiency of workers processing the thread end of cloth in the prior art, the present application provides a thread cutting device and a sewing machine with the same.

[0040] As Figures 1 to 8As shown in FIGS. 1 and 2, the thread trimming device is arranged below the needle of the sewing machine, and the thread trimming device comprises a base 10, a fixed knife assembly 20, a thread clamping assembly 30 and a movable knife assembly 40. The base 10 has a thread passing hole 111. The fixed knife assembly 20 is arranged on the base 10, and the fixed knife assembly 20 has a fixed knife edge 221. The thread clamping assembly 30 is arranged on the base 10. The movable knife assembly 40 is arranged on the base 10, and the movable knife assembly 40 has a thread passing hole 421 and a movable knife edge 422. The movable knife assembly 40 has an initial position, a thread clamping position and a thread trimming position. When the movable knife assembly 40 is in the initial position, the thread passing hole 421 is below the thread passing hole 111 to allow the needle and the sewing thread to pass through. When the movable knife assembly 40 is in the thread clamping position, the movable knife assembly 40 is in contact with the thread clamping assembly 30 to clamp the sewing thread. When the movable knife assembly 40 is in the thread trimming position, the fixed knife edge 221 is engaged with the movable knife edge 422 to cut the sewing thread.

[0041] The thread trimming device is arranged below the needle of the sewing machine, and the base 10 of the thread trimming device has a thread passing hole 111. The fixed knife assembly 20 is arranged on the base 10, and the fixed knife assembly 20 has a fixed knife edge 221. The thread clamping assembly 30 is arranged on the base 10. The movable knife assembly 40 is arranged on the base 10, and the movable knife assembly 40 has a thread passing hole 421 and a movable knife edge 422. The movable knife assembly 40 has an initial position, a thread clamping position and a thread trimming position. When the movable knife assembly 40 is in the initial position, the thread passing hole 421 is below the thread passing hole 111 to allow the needle and the sewing thread to pass through. When the movable knife assembly 40 is in the thread clamping position, the movable knife assembly 40 is in contact with the thread clamping assembly 30 to clamp the sewing thread. When the movable knife assembly 40 is in the thread trimming position, the fixed knife edge 221 is engaged with the movable knife edge 422 to cut the sewing thread.

[0042] In this embodiment, the base 10 comprises a needle plate structure 11 having a thread passing hole 111, and the needle plate structure 11 is above the fixed knife assembly 20.

[0043] Specifically, the movable knife assembly 40 is in interference fit with the thread clamping assembly 30 to ensure reliable clamping.

[0044] As shown in FIGS. 1 and 2, Figure 2 and Figure 4 The thread trimming device further comprises a driving assembly 50 arranged on the base 10 and drivingly connected with the movable knife assembly 40 to drive the movable knife assembly 40 to switch between the initial position, the thread clamping position and the thread trimming position. In this way, the operator only needs to start the driving assembly 50 to realize the operation of the movable knife assembly 40, which reduces the operation difficulty and intensity of the operator and further improves the work efficiency of the operator.

[0045] In this embodiment, the driving assembly 50 is an electric motor.

[0046] As shown in Figure 3 and Figure 5 The moving knife assembly 40 includes a receiving structure 41 and a contact structure 42. The receiving structure 41 is arranged on the base 10. The contact structure 42 is arranged on the receiving structure 41, and the contact structure 42 has a wire passing hole 421 and a moving knife blade edge 422. Among them, the driving assembly 50 is drivingly connected with the receiving structure 41 to drive the receiving structure 41 to drive the contact structure 42 to swing along the preset trajectory. In this way, the moving knife assembly 40 realizes the connection between the base 10 and the driving connection between the driving assembly 50 through the receiving structure 41. At the same time, the driving assembly 50 drives the receiving structure 41 to swing, so that the contact structure 42 swings, and then the moving knife assembly 40 swings from the initial position to the line cutting position, ensuring the reliability of the sewing machine processing thread end.

[0047] As shown in Figure 3 and Figure 7 The thread clamping assembly 30 includes a fixed structure 31 and a thread clamping structure 32. The fixed structure 31 is arranged on the base 10. The thread clamping structure 32 is arranged on the fixed structure 31, and the thread clamping structure 32 is in the form of a plate and includes a transition part 321 and a thread clamping part 322 connected with each other, and the contact structure 42 passes through the transition part 321 and is attached to the thread clamping part 322. Among them, at least part of the transition part 321 is arranged in an arc shape. In this way, the thread clamping assembly 30 realizes the connection between the base 10 and the driving connection between the driving assembly 50 through the fixed structure 31. At the same time, when the contact structure 42 swings to be attached to the thread clamping part 322, it realizes the clamping of the sewing thread. At the same time, the setting mode of the transition part 321 is conducive to the swinging of the contact structure 42 to the thread clamping part 322, ensuring the smoothness of the swinging of the contact structure 42, thereby ensuring the smoothness and reliability of the cooperation between the contact structure 42 and the clamping part.

[0048] Specifically, when the moving knife assembly 40 is in the initial position, the wire passing hole 421 on the contact structure 42 moves to the lower side of the threading hole 111; when the moving knife assembly 40 is in the thread clamping position, the contact structure 42 contacts the thread clamping assembly 30; when the moving knife assembly 40 is in the thread cutting position, the moving knife blade edge 422 on the contact structure 42 swings to the fixed knife blade edge 221 to cut the sewing thread.

[0049] As shown in Figure 3 and Figure 6As shown, the fixed knife assembly 20 comprises a bearing structure 21 and a fixed knife structure 22. The bearing structure 21 is arranged on the fixed structure 31. The fixed knife structure 22 is arranged on the bearing structure 21, and the fixed knife structure 22 has a fixed knife edge 221. Among them, the fixed knife structure 22 is located above the clamping wire structure 32, and at least part of the fixed knife structure 22 and at least part of the clamping wire structure 32 form a shearing wire space therearound for accommodating at least part of the contact structure 42. In this way, the fixed knife assembly 20 realizes the connection between the bearing structure 21 and the clamping wire assembly 30, and further realizes the connection between the base 10 and the clamping wire assembly 30. At the same time, the arrangement of the fixed knife structure 22 and the clamping wire structure 32, on the one hand, makes the fixed knife assembly 20 and the clamping wire structure 32 overlap, reduces the occupied space of the fixed knife assembly 20 and the clamping wire assembly 30, and improves the structural compactness of the shearing wire device; on the other hand, the contact structure 42 can sequentially complete the clamping cooperation between the clamping wire structure 32 and the shearing cooperation with the fixed knife structure 22 in the shearing wire space, further improving the space utilization and convenience of the shearing wire device.

[0050] As shown in Figure 2 and Figure 4 The shearing wire device further comprises a transmission assembly 60, and the transmission assembly 60 comprises a rotating structure 61 and a transmission structure 62. The rotating structure 61 is drivingly connected with the driving assembly 50 to drive the rotating structure 61 to rotate. One end of the transmission structure 62 is rotationally connected with the rotating structure 61, and the other end of the transmission structure 62 is connected with the receiving structure 41. Among them, in the process of rotating the rotating structure 61, the transmission structure 62 drives the receiving structure 41 to swing. In this way, the above-mentioned arrangement converts the rotating movement of the driving assembly 50 driving the rotating structure 61 into the reciprocating swinging movement of the receiving structure 41, so as to realize the swinging movement of the contact structure 42, and further realize the swinging of the movable knife assembly 40 from the initial position to the clamping position and the shearing position. At the same time, the above-mentioned arrangement makes the composition of the transmission assembly 60 relatively simple, reduces the production cost of the shearing wire device, and also efficiently and stably transmits the driving force of the driving assembly 50, thereby improving the driving reliability of the driving assembly 50.

[0051] As shown in Figure 2 and Figure 4As shown, the driving assembly 50 has an output shaft 51, and the rotating structure 61 includes a clamping structure and a main body structure 612. The clamping structure includes at least two clamping pieces 611 which surround a clamping space which is adjustably arranged for clamping the output shaft 51. The main body structure 612 is arranged on the clamping structure, and an end of the main body structure 612 away from the clamping structure is connected with the transmission structure 62. In this way, the rotating structure 61 is connected with the driving assembly 50 through the clamping structure, and is connected with the transmission assembly 60 through the main body structure 612. Meanwhile, the clamping structure is arranged in a manner that the clamping structure can adapt to driving assemblies 50 of different specifications and sizes, thereby improving the use versatility of the clamping structure and the versatility of the thread cutting device.

[0052] In the embodiment, the number of the clamping pieces 611 is two.

[0053] It should be noted that the number of the clamping pieces 611 is not limited to this, and can be adjusted according to the working conditions and use requirements. Optionally, the number of the clamping pieces 611 is three, or four, or six, or eight, or a plurality.

[0054] As shown in Figure 2 , the base 10 has a bearing recess 12, and at least part of the transmission structure 62 is movably arranged in the bearing recess 12. In this way, the bearing recess 12 can support the transmission structure 62, avoiding the phenomenon that the transmission structure 62 shakes due to being too long, and ensuring the transmission reliability and stability of the transmission structure 62. Meanwhile, the inner wall of the bearing recess 12 can limit and stop the transmission structure 62, avoiding the phenomenon that the transmission structure 62 is displaced during long-time movement, and further ensuring the transmission reliability and stability of the transmission structure 62.

[0055] As shown in Figure 2 and Figure 8 , the thread cutting device further includes a collecting assembly 70 which is arranged on the base 10 and has a collecting opening 71 and a collecting cavity 72 which are in communication with each other. The collecting opening 71 is located below the thread clamping assembly 30, so that the cut sewing thread enters the collecting cavity 72 through the collecting opening 71. In this way, when the sewing thread is cut, the thread end enters the collecting cavity 72 through the collecting opening 71, ensuring the tidiness of the clamping assembly and the thread cutting device, and facilitating the swinging of the moving knife assembly 40 into the thread cutting space for the next round of thread cutting movement, thereby ensuring the smoothness and reliability of the thread cutting device.

[0056] In the embodiment, the sewing machine further comprises a thread cutting device 80 arranged on the base 10 to cut the sewing thread after the sewing of the cloth is completed, and a rotating shuttle device 90 arranged on the base 10 below the threading hole 111 to hook the sewing thread.

[0057] The application further provides a sewing machine comprising the thread cutting device.

[0058] Specifically, when the worker uses the sewing machine to sew the cloth, the worker threads the sewing thread on the needle, the needle drives the sewing thread to pass through the threading hole 111 and the passing hole 421 when the needle sews the first needle, at this time, the rotating shuttle device 90 hooks the sewing thread, the needle returns above the threading hole 111, the thread cutting device 40 drives the sewing thread to swing to the clamping position, the thread cutting device 40 and the clamping device 30 clamp the sewing thread, then, the needle continues to sew, the collecting device 70 collects the thread end at the clamping position of the clamping device 30, and the thread cutting device 80 cuts the thread end at the end position of the cloth after the needle sews the cloth, thereby completing the sewing of the cloth.

[0059] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0060] The thread cutting device is arranged below the needle of the sewing machine, the base of the thread cutting device has a threading hole. The fixed blade assembly is arranged on the base, and the fixed blade assembly has a fixed blade edge. The clamping device is arranged on the base. The movable blade assembly is arranged on the base, and the movable blade assembly has a passing hole and a movable blade edge. The movable blade assembly has an initial position, a clamping position and a thread cutting position. When the movable blade assembly is at the initial position, the passing hole is below the threading hole to allow the needle and the sewing thread to pass through. When the movable blade assembly is at the clamping position, the movable blade assembly contacts the clamping device to clamp the sewing thread. When the movable blade assembly is at the thread cutting position, the fixed blade edge and the movable blade edge are engaged to cut the sewing thread.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0062] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above-described drawings are used only for distinguishing between similar objects and do not necessarily have to describe a specific sequential or chronological order. It is to be understood that the data so distinguished can be interchanged, under appropriate circumstances, such that the embodiments of the present application described herein can be practiced in other than the illustrated or described order.

[0063] The preferred embodiments of the present application have been described above with the specific details. Obviously, the present application can be carried out without the specific details. It is to be understood that the above-described embodiments are only used to illustrate the present application, and the present application can be modified and changed in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thread trimming device for being disposed below a needle of a sewing machine, characterized by, The thread cutting device comprises: a base (10) having a thread hole (111); a fixed knife assembly (20) arranged on the base (10), the fixed knife assembly (20) having a fixed knife edge (221); a thread clamping assembly (30) arranged on the base (10); a movable knife assembly (40) arranged on the base (10), the movable knife assembly (40) having a thread passing hole (421) and a movable knife edge (422); wherein the movable knife assembly (40) has an initial position, a thread clamping position and a thread cutting position, when the movable knife assembly (40) is in the initial position, the thread passing hole (421) is located below the thread hole (111) for the needle and the sewing thread to pass through; when the movable knife assembly (40) is in the thread clamping position, the movable knife assembly (40) is in contact with the thread clamping assembly (30) to clamp the sewing thread; when the movable knife assembly (40) is in the thread cutting position, the fixed knife edge (221) and the movable knife edge (422) are engaged to cut the sewing thread.

2. The thread trimming device according to claim 1, wherein The thread cutting device further comprises a driving assembly (50) arranged on the base (10) and drivingly connected with the movable knife assembly (40) to drive the movable knife assembly (40) to switch between the initial position, the thread clamping position and the thread cutting position.

3. The thread trimming device according to claim 2, wherein The movable knife assembly (40) comprises: a bearing structure (41) arranged on the base (10); a contact structure (42) arranged on the bearing structure (41), the contact structure (42) having the thread passing hole (421) and the movable knife edge (422); wherein the driving assembly (50) is drivingly connected with the bearing structure (41) to drive the bearing structure (41) to swing the contact structure (42) along a preset track.

4. The thread trimming device according to claim 3, wherein The thread clamping assembly (30) comprises: a fixed structure (31) arranged on the base (10); a thread clamping structure (32) arranged on the fixed structure (31), the thread clamping structure (32) being plate-shaped and comprising a transition part (321) and a thread clamping part (322) connected with each other, the contact structure (42) passing through the transition part (321) and being fitted with the thread clamping part (322); wherein at least part of the transition part (321) is arranged in an arc shape.

5. The thread trimming device according to claim 4, wherein The fixed knife assembly (20) comprises: a bearing structure (21) arranged on the fixed structure (31); a fixed knife structure (22) arranged on the bearing structure (21), the fixed knife structure (22) having the fixed knife edge (221); wherein the fixed knife structure (22) is located above the thread clamping structure (32), and at least part of the fixed knife structure (22) and at least part of the thread clamping structure (32) surround a thread cutting space for accommodating at least part of the contact structure (42).

6. The thread trimming device according to claim 3, wherein The thread cutting device further comprises a transmission assembly (60), the transmission assembly (60) comprising: A rotating structure (61), the driving assembly (50) is drivingly connected with the rotating structure (61) to drive the rotating structure (61) to rotate; A transmission structure (62), one end of the transmission structure (62) is rotatably connected with the rotating structure (61), and the other end of the transmission structure (62) is connected with the receiving structure (41); Wherein, in the process of rotating the rotating structure (61), the transmission structure (62) drives the receiving structure (41) to swing.

7. The thread trimming device according to claim 6, wherein The driving assembly (50) has an output shaft (51), and the rotating structure (61) comprises: A clamping structure comprising at least two clamping pieces (611), the at least two clamping pieces (611) surround a clamping space, and the clamping space is adjustably arranged for clamping the output shaft (51); A main body structure (612) arranged on the clamping structure, and one end of the main body structure (612) away from the clamping structure is connected with the transmission structure (62).

8. The thread trimming device according to claim 7, wherein The base (10) has a bearing recess (12), and at least part of the transmission structure (62) is movably arranged in the bearing recess (12).

9. The thread trimming device of claim 1, wherein The thread cutting device further comprises a collecting assembly (70) arranged on the base (10), the collecting assembly (70) has a collecting opening (71) and a collecting cavity (72) in communication with each other, and the collecting opening (71) is located below the thread clamping assembly (30) so that the cut sewing thread enters the collecting cavity (72) through the collecting opening (71).

10. A sewing machine characterized by comprising: The sewing machine comprises the thread cutting device according to any one of claims 1 to 9. The driving assembly (50) has an output shaft (51), and the rotating structure (61) comprises: A clamping structure comprising at least two clamping pieces (611), the at least two clamping pieces (611) surround a clamping space, and the clamping space is adjustably arranged for clamping the output shaft (51); A main body structure (612) arranged on the clamping structure, and one end of the main body structure (612) away from the clamping structure is connected with the transmission structure (62). The base (10) has a bearing recess (12), and at least part of the transmission structure (62) is movably arranged in the bearing recess (12). The thread cutting device further comprises a collecting assembly (70) arranged on the base (10), the collecting assembly (70) has a collecting opening (71) and a collecting cavity (72) in communication with each other, and the collecting opening (71) is located below the thread clamping assembly (30) so that the cut sewing thread enters the collecting cavity (72) through the collecting opening (71). The sewing machine comprises the thread cutting device according to any one of claims 1 to 9.

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