Thread trimming device and sewing machine

Abstract

The utility model provides a thread trimming device and a sewing machine, and the thread trimming device comprises a needle plate which is provided with a needle plate hole for a thread segment to be trimmed to pass through; the movable cutter is arranged in the needle plate in a swinging manner; the fixed cutter is arranged in the needle plate and used for being matched with the movable cutter to complete thread trimming action; the transmission assembly comprises a transmission rod and a transmission shaft, one end of the transmission shaft is connected with the movable cutter, the other end of the transmission shaft is in transmission connection with the transmission rod, and the transmission rod is arranged in a reciprocating movable mode in the preset direction so that the transmission shaft can be driven to rotate around the axis of the transmission shaft through movement of the transmission rod, and the movable cutter can swing to the position attached to the fixed cutter to complete thread trimming; wherein the position where the movable cutter is attached to the fixed cutter is arranged close to the needle plate hole. The thread trimming device solves the problem that thread residues left on fabric are long in the thread trimming process of a thread trimming device in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a thread trimming device and a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing material are interwoven or sewn together; during the production process, the bobbin thread is set in the hook of the sewing machine, and the fabric is sewn by moving the upper thread to intersect with the lower thread. When sewing the last stitch, the upper thread and the lower thread will pass through the needle plate hole of the needle plate and intertwine under the needle plate, and then the intertwined upper thread and lower thread are cut by the thread cutting device, at which time one end of the upper thread and the lower thread are connected to the fabric.

[0003] Most of the thread cutting devices complete the cutting of the upper thread and the lower thread by fitting the movable knife and the fixed knife. Since the fixed knife and the movable knife are arranged outside the needle plate, the fitting point of the movable knife and the fixed knife is far away from the needle plate hole, so the upper thread and the lower thread need to extend a certain distance from the needle plate hole before they can be cut. Therefore, the end of the upper thread and the lower thread connected to the fabric is longer, resulting in longer thread ends left on the fabric. Utility Model Content

[0004] The main purpose of the utility model is to provide a thread trimming device and a sewing machine, so as to solve the problem that the thread trimming device in the prior art leaves a long thread end on the fabric during the thread trimming process.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a thread trimming device is provided, comprising: a needle plate, a needle plate hole for allowing a line segment to be cut to pass through is provided on the needle plate; a movable knife is swingably arranged inside the needle plate; a fixed knife is arranged inside the needle plate, and the fixed knife is used to cooperate with the movable knife to complete the thread trimming action; a transmission assembly, comprising a transmission rod and a transmission shaft, one end of the transmission shaft is connected to the movable knife, and the other end of the transmission shaft is transmission-connected to the transmission rod, and the transmission rod is reciprocatingly movably arranged along a preset direction, so that the movement of the transmission rod drives the transmission shaft to rotate around the axis of the transmission shaft, so that the movable knife swings to a position in contact with the fixed knife to complete the thread trimming; wherein the position in contact with the movable knife and the fixed knife is arranged close to the needle plate hole.

[0006] Furthermore, the transmission assembly also includes a transmission member, one end of which is connected to the transmission shaft, and the other end of which is hinged to the transmission rod, so that the transmission member is driven to rotate through the movement of the transmission rod, so that the transmission member drives the transmission shaft to rotate.

[0007] Furthermore, the transmission member includes a transmission body, on which a transmission pin is arranged, the axial direction of the transmission pin is arranged parallel to the axial direction of the transmission shaft, a first connecting hole is arranged on the transmission rod, and the transmission pin is clearance-matched with the first connecting hole so that the transmission rod and the transmission member are hinged.

[0008] Furthermore, the transmission member also includes a connecting portion, which is connected to the transmission body. A second connecting hole is provided on the connecting portion, and the transmission shaft is inserted into the second connecting hole to connect the transmission member to the transmission shaft.

[0009] Furthermore, the thread trimming device also includes a movable knife holder, on which the movable knife is arranged, and the movable knife holder is connected to the transmission shaft so as to drive the movable knife holder to rotate through the transmission shaft so that the movable knife moves around the axis direction of the transmission shaft toward the direction close to the fixed knife.

[0010] Furthermore, the movable knife includes a movable knife body and a connecting section, and two ends of the connecting section are respectively connected to the movable knife holder and the movable knife body, so that the movable knife holder drives the movable knife body to move.

[0011] Furthermore, a guide groove is arranged in the needle plate, a needle plate hole is arranged on the groove wall of the guide groove, the fixed knife is inserted into the guide groove and arranged on one side of the needle plate hole, and the movable knife body can be movably inserted into the guide groove.

[0012] Furthermore, a wire passing groove is provided on the movable knife body, and the wire passing groove has a closed end and a free end arranged relatively along its extension direction, so that the movable knife swings to a position where the closed end fits with the fixed knife to complete the wire cutting.

[0013] Furthermore, a wire hooking recess is provided at the free end of the wire passing groove, which is recessed in a direction away from the fixed knife. The wire hooking recess is used to engage with the wire segment to be cut so that the movable knife drives the wire segment to move.

[0014] According to another aspect of the utility model, a sewing machine is provided, comprising the above-mentioned thread trimming device.

[0015] According to the technical solution of the utility model, the thread trimming device includes a movable knife, a fixed knife and a transmission assembly, and the transmission assembly includes a transmission rod and a transmission shaft, one end of the transmission shaft is connected to the movable knife, and the other end of the transmission shaft is connected to the transmission rod. The transmission rod reciprocates along a preset direction to drive the transmission shaft to rotate around the axis of the transmission shaft, so that the transmission shaft drives the movable knife to swing to a position that fits with the fixed knife to complete the thread trimming. The present application arranges the fixed knife and the movable knife inside the needle plate so that the position where the movable knife fits with the fixed knife, that is, the position where the line segment to be trimmed is cut, is closer to the needle plate hole, so that the line segment to be trimmed no longer needs to extend a certain distance from the needle plate hole before it can be cut, so that the thread ends left on the fabric are shorter, thereby solving the problem of the existing thread trimming device having a long thread end left on the fabric during the thread trimming process. At the same time, since the transmission rod does not require high installation and manufacturing precision, the production cost and thread trimming cost of the thread trimming device of the utility model are lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of an embodiment of a thread trimming device (without the rotary hook and the rotary hook shaft) according to the utility model is shown;

[0018] Figure 2 A schematic structural diagram of an embodiment of a thread trimming device (without the needle plate) according to the utility model is shown;

[0019] Figure 3 The exploded structural diagram of the wire cutting device according to the utility model is shown;

[0020] Figure 4 A schematic diagram showing the cooperation between the movable knife and the fixed knife of the thread trimming device according to the utility model is shown;

[0021] Figure 5 A schematic structural diagram of a movable knife of a thread trimming device according to the utility model is shown;

[0022] Figure 6 Shows Figure 1 A local enlarged schematic diagram of point A in the middle.

[0023] The above drawings include the following reference numerals:

[0024] 10. Moving knife; 20. Fixed knife; 30. Transmission assembly; 31. Transmission rod; 32. Transmission shaft; 33. Transmission member; 331. Transmission body; 337. Transmission pin; 311. First connecting hole; 332. Connecting part; 333. Second connecting hole; 11. Moving knife holder; 12. Moving knife body; 13. Connecting section; 16. Thread hooking recess; 17. Thread passing groove; 172. Closed end; 40. Needle plate; 41. Needle plate hole; 42. Guide groove; 110. Rotary shuttle; 111. Rotary shuttle shaft. DETAILED DESCRIPTION

[0025] 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 "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] Please refer to Figures 1 to 6 The utility model provides a thread trimming device, comprising: a needle plate 40, on which a needle plate hole 41 for a line segment to be cut is provided; a movable knife 10, which is swingably arranged inside the needle plate 40; a fixed knife 20, which is arranged inside the needle plate 40, and the fixed knife 20 is used to cooperate with the movable knife 10 to complete the thread trimming action; a transmission assembly 30, comprising a transmission rod 31 and a transmission shaft 32, one end of the transmission shaft 32 is connected to the movable knife 10, and the other end of the transmission shaft 32 is transmission-connected to the transmission rod 31, and the transmission rod 31 is reciprocatingly movably arranged along a preset direction, so that the movement of the transmission rod 31 drives the transmission shaft 32 to rotate around the axis of the transmission shaft 32, so that the movable knife 10 swings to a position in contact with the fixed knife 20 to complete the thread trimming; wherein the position in which the movable knife 10 and the fixed knife 20 are in contact is arranged close to the needle plate hole 41.

[0029] The thread trimming device of the utility model comprises a movable knife 10, a fixed knife 20 and a transmission assembly 30, wherein the transmission assembly 30 comprises a transmission rod 31 and a transmission shaft 32, wherein one end of the transmission shaft 32 is connected to the movable knife 10, and the other end of the transmission shaft 32 is transmission-connected to the transmission rod 31. The transmission rod 31 reciprocates along a preset direction to drive the transmission shaft 32 to rotate around the axis of the transmission shaft 32, so that the transmission shaft 32 drives the movable knife 10 to swing to a position that fits the fixed knife 20 to complete the thread trimming. The present application arranges the fixed knife 20 and the movable knife 10 inside the needle plate 40 so that the position where the movable knife 10 fits with the fixed knife 20, i.e., the position where the line segment to be cut is cut, is closer to the needle plate hole 41, so that the line segment to be cut no longer needs to extend a certain distance from the needle plate hole 41 before it can be cut, so that the thread ends left on the fabric are shorter, thereby solving the problem of long thread ends left on the fabric during the thread cutting process of the thread cutting device in the prior art. At the same time, since the transmission rod 31 does not require high installation and manufacturing precision, the production cost and thread cutting cost of the thread cutting device of the present invention are relatively low.

[0030] In this embodiment, if Figures 1 to 3 As shown, the transmission assembly 30 also includes a transmission member 33, one end of which is connected to the transmission shaft 32, and the other end of the transmission member 33 is hinged to the transmission rod 31, so that the transmission member 33 is driven to rotate through the movement of the transmission rod 31, so that the transmission member 33 drives the transmission shaft 32 to rotate.

[0031] Specifically, the transmission member 33 is used to transmit and connect the transmission shaft 32 and the transmission rod 31 , so that the transmission rod 31 can drive the transmission shaft 32 to rotate, thereby improving the transmission reliability of the transmission assembly 30 .

[0032] In this embodiment, if Figures 1 to 3 As shown, the transmission member 33 includes a transmission body 331, on which a transmission pin 337 is arranged, and the axial direction of the transmission pin 337 is arranged parallel to the axial direction of the transmission shaft 32. A first connecting hole 311 is arranged on the transmission rod 31, and the transmission pin 337 is clearance-matched with the first connecting hole 311 so that the transmission rod 31 and the transmission member 33 are hinged.

[0033] Specifically, such a configuration ensures the reliability of the articulation between the transmission rod 31 and the transmission member 33 , and ensures that the transmission rod 31 can drive the transmission member 33 to rotate.

[0034] Specifically, the thread trimmer device further comprises a driving member, which is drivingly connected to the transmission rod 31, and drives the transmission rod 31 to move. Optionally, the driving member is a driving cylinder.

[0035] In this embodiment, if Figures 1 to 3As shown, the transmission member 33 also includes a connecting portion 332 , which is connected to the transmission body 331 . The connecting portion 332 is provided with a second connecting hole 333 , and the transmission shaft 32 is passed through the second connecting hole 333 to connect the transmission member 33 to the transmission shaft 32 .

[0036] Specifically, such a configuration ensures the connection reliability between the transmission member 33 and the transmission shaft 32 , and ensures that the transmission member 33 can drive the transmission shaft 32 to rotate.

[0037] In this embodiment, if Figure 4 and Figure 5 As shown, the thread trimming device also includes a movable knife holder 11, on which a movable knife 10 is disposed. The movable knife holder 11 is connected to a transmission shaft 32 so as to drive the movable knife holder 11 to rotate via the transmission shaft 32, so that the movable knife 10 moves around the axis of the transmission shaft 32 toward a direction close to the fixed knife 20.

[0038] Specifically, the movable knife holder 11 is used to connect the movable knife 10 and the transmission shaft 32 , so that the transmission shaft 32 drives the movable knife holder 11 to rotate and thus realizes the swing of the movable knife 10 .

[0039] In this embodiment, if Figure 4 and Figure 5 As shown, the movable knife 10 includes a movable knife body 12 and a connecting section 13. Two ends of the connecting section 13 are respectively connected to the movable knife holder 11 and the movable knife body 12, so that the movable knife holder 11 drives the movable knife body 12 to move.

[0040] Specifically, the connecting section 13 is used to connect the movable knife body 12 and the movable knife holder 11 to ensure that the movable knife body 12 can swing to a position that fits with the fixed knife 20 to complete thread cutting.

[0041] In this embodiment, if Figure 6 As shown, a guide groove 42 is provided in the needle plate 40 , a needle plate hole 41 is provided on the groove wall of the guide groove 42 , the fixed knife 20 is inserted into the guide groove 42 and is arranged on one side of the needle plate hole 41 , and the movable knife body 12 is movably inserted into the guide groove 42 .

[0042] Specifically, the guide groove 42 is used to guide the movable knife body 12. At the same time, since the needle plate hole 41 is arranged on the groove wall of the guide groove 42, the fixed knife 20 and the movable knife body 12 are both arranged in the guide groove 42, and along the extension direction of the transmission shaft 32, the distance between the movable knife body 12 and the needle plate hole 41 remains unchanged, and the distance between the movable knife body 12 and the needle plate hole 41 is always small, and the distance between the fixed knife 20 and the needle plate hole 41 remains unchanged, and the distance between the fixed knife 20 and the needle plate hole 41 is always small. During the movement of the movable knife body 12, the line segment to be cut passing through the needle plate hole 41 does not need to be extended for a distance along the extension direction of the transmission shaft 32, and can be hooked by the movable knife body 12 and moved in the direction close to the fixed knife 20, so that the distance from the position where the fixed knife 20 and the movable knife body 12 are in contact with the fabric is also small, that is, the thread ends left on the fabric are small.

[0043] In this embodiment, if Figure 4 and Figure 5 As shown, a wire passing groove 17 is provided on the movable knife body 12, and the wire passing groove 17 has a closed end 172 and a free end arranged opposite to each other along its extension direction, so that the movable knife 10 swings to a position where the closed end 172 fits with the fixed knife 20 to complete the wire cutting.

[0044] Specifically, when the movable knife 10 swings to the position where the free end fits with the fixed knife 20, the line segment to be cut is blocked by the fixed knife 20 and is gradually pressed from the free end to the closed end 172 by the fixed knife 20. The movable knife 10 continues to swing to the position where the closed end 172 fits with the fixed knife 20, and the blade of the fixed knife 20 abuts against the closed end 172. The blade of the fixed knife 20 cuts off the line segment at the closed end 172, completing the line cutting.

[0045] In this embodiment, if Figure 4 and Figure 5 As shown, the free end of the wire groove 17 is provided with a wire hooking recess 16, which is recessed in a direction away from the fixed knife 20. The wire hooking recess 16 is used to engage with the wire segment to be cut so that the movable knife 10 drives the wire segment to move.

[0046] Specifically, the line hooking recess 16 is engaged with the line segment to be cut, so that the movable knife 10 can drive the line segment to move, thereby preventing the line segment from being separated from the movable knife 10 during the movement of the movable knife 10 .

[0047] Specifically, Figure 2 As shown, the thread trimming device further includes a rotary hook 110 and a rotary hook shaft 111 . The rotary hook 110 is disposed below the movable knife 10 and the fixed knife 20 . The rotary hook shaft 111 is disposed below the rotary hook 110 . The transmission shaft 32 is disposed on one side of the rotary hook shaft 111 .

[0048] The utility model also provides a sewing machine, comprising the thread trimming device in the above embodiment.

[0049] The thread trimming device of the utility model comprises a movable knife 10, a fixed knife 20 and a transmission assembly 30, wherein the transmission assembly 30 comprises a transmission rod 31 and a transmission shaft 32, wherein one end of the transmission shaft 32 is connected to the movable knife 10, and the other end of the transmission shaft 32 is transmission-connected to the transmission rod 31. The transmission rod 31 reciprocates along a preset direction to drive the transmission shaft 32 to rotate around the axis of the transmission shaft 32, so that the transmission shaft 32 drives the movable knife 10 to swing to a position that fits the fixed knife 20 to complete the thread trimming. The present application arranges the fixed knife 20 and the movable knife 10 inside the needle plate 40 so that the position where the movable knife 10 fits with the fixed knife 20, i.e., the position where the line segment to be cut is cut, is closer to the needle plate hole 41, so that the line segment to be cut no longer needs to extend a certain distance from the needle plate hole 41 before it can be cut, so that the thread ends left on the fabric are shorter, thereby solving the problem of long thread ends left on the fabric during the thread cutting process of the thread cutting device in the prior art. At the same time, since the transmission rod 31 does not require high installation and manufacturing precision, the production cost and thread cutting cost of the thread cutting device of the present invention are relatively low.

[0050] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0051] The thread trimming device of the utility model comprises a movable knife 10, a fixed knife 20 and a transmission assembly 30, wherein the transmission assembly 30 comprises a transmission rod 31 and a transmission shaft 32, wherein one end of the transmission shaft 32 is connected to the movable knife 10, and the other end of the transmission shaft 32 is transmission-connected to the transmission rod 31. The transmission rod 31 reciprocates along a preset direction to drive the transmission shaft 32 to rotate around the axis of the transmission shaft 32, so that the transmission shaft 32 drives the movable knife 10 to swing to a position that fits the fixed knife 20 to complete the thread trimming. The present application arranges the fixed knife 20 and the movable knife 10 inside the needle plate 40 so that the position where the movable knife 10 fits with the fixed knife 20, i.e., the position where the line segment to be cut is cut, is closer to the needle plate hole 41, so that the line segment to be cut no longer needs to extend a certain distance from the needle plate hole 41 before it can be cut, so that the thread ends left on the fabric are shorter, thereby solving the problem of long thread ends left on the fabric during the thread cutting process of the thread cutting device in the prior art. At the same time, since the transmission rod 31 does not require high installation and manufacturing precision, the production cost and thread cutting cost of the thread cutting device of the present invention are relatively low.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A thread trimming device, characterized in that: include: A needle plate (40), wherein the needle plate (40) is provided with a needle plate hole (41) for allowing the line segment to be cut to pass through; A movable knife (10) is swingably arranged inside the needle plate (40); A fixed knife (20) is arranged inside the needle plate (40), and the fixed knife (20) is used to cooperate with the movable knife (10) to complete the thread cutting action; A transmission assembly (30) comprises a transmission rod (31) and a transmission shaft (32), one end of the transmission shaft (32) being connected to the movable knife (10), and the other end of the transmission shaft (32) being transmission-connected to the transmission rod (31), the transmission rod (31) being arranged to be reciprocatingly movable along a preset direction, so that the movement of the transmission rod (31) drives the transmission shaft (32) to rotate around the axis of the transmission shaft (32), so that the movable knife (10) swings to a position where it fits with the fixed knife (20) to complete thread cutting; wherein the position where the movable knife (10) fits with the fixed knife (20) is arranged close to the needle plate hole (41).

2. The thread trimming device according to claim 1, characterized in that: The transmission assembly (30) further comprises a transmission member (33), One end of the transmission member (33) is connected to the transmission shaft (32), and the other end of the transmission member (33) is hinged to the transmission rod (31), so that the transmission member (33) is driven to rotate by the movement of the transmission rod (31), so that the transmission member (33) drives the transmission shaft (32) to rotate.

3. The thread trimming device according to claim 2, characterized in that: The transmission member (33) comprises a transmission body (331), a transmission pin (337) is arranged on the transmission body (331), the axial direction of the transmission pin (337) is arranged parallel to the axial direction of the transmission shaft (32), a first connecting hole (311) is arranged on the transmission rod (31), and the transmission pin (337) is clearance-matched with the first connecting hole (311) so that the transmission rod (31) and the transmission member (33) are hingedly connected.

4. The thread trimming device according to claim 3, characterized in that: The transmission member (33) further comprises a connecting portion (332), wherein the connecting portion (332) is connected to the transmission body (331), and a second connecting hole (333) is provided on the connecting portion (332), and the transmission shaft (32) is inserted into the second connecting hole (333) so as to connect the transmission member (33) to the transmission shaft (32).

5. The thread trimming device according to claim 1, characterized in that: The thread trimming device further comprises a movable knife frame (11), the movable knife (10) being arranged on the movable knife frame (11), and the movable knife frame (11) being connected to the transmission shaft (32) so as to drive the movable knife frame (11) to rotate via the transmission shaft (32), so that the movable knife (10) moves around the axis direction of the transmission shaft (32) in a direction close to the fixed knife (20).

6. The thread trimming device according to claim 5, characterized in that: The movable knife (10) comprises a movable knife body (12) and a connecting section (13), and two ends of the connecting section (13) are respectively connected to the movable knife holder (11) and the movable knife body (12), so that the movable knife holder (11) drives the movable knife body (12) to move.

7. The thread trimming device according to claim 6, characterized in that: The needle plate (40) is provided with a guide groove (42), the groove wall of the guide groove (42) is provided with the needle plate hole (41), the fixed knife (20) is inserted into the guide groove (42) and is arranged on one side of the needle plate hole (41), and the movable knife body (12) is movably inserted into the guide groove (42).

8. The thread trimming device according to claim 6, characterized in that: The movable knife body (12) is provided with a wire passing groove (17), and the wire passing groove (17) has a closed end (172) and a free end arranged opposite to each other along its extension direction, so that the movable knife (10) swings to a position where the closed end (172) fits the fixed knife (20) to complete the wire cutting.

9. The thread trimming device according to claim 8, characterized in that: The free end of the wire-passing groove (17) is provided with a wire-hooking recess (16), the wire-hooking recess (16) being recessed in a direction away from the fixed knife (20), and the wire-hooking recess (16) is used to engage with a wire segment to be cut, so that the movable knife (10) drives the wire segment to move.

10. A sewing machine, characterized in that: The invention comprises the thread cutting device according to any one of claims 1 to 9.

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