Sewing machine needle-bending clutch device and sewing machine

Abstract

The application relates to the technical field of sewing equipment, in particular to a sewing machine curved needle clutch device and a sewing machine. The sewing machine curved needle clutch device comprises a curved needle frame and a clutch mechanism. The clutch mechanism comprises a limiting seat, a clamping rod and a pull rod assembly. The limiting seat is used for being fixed on a transmission shaft, and a limiting part is arranged on the limiting seat. The clamping rod is arranged on the curved needle frame and can move in a first direction, and the clamping rod can be limited on the limiting part. The pull rod assembly is rotatably installed on a machine shell and can move in the first direction. The pull rod assembly comprises a pull rod, a first force applying piece and a second force applying piece. The pull rod is rotatably installed on the machine shell. The first force applying piece and the second force applying piece are arranged on the pull rod. The first force applying piece is arranged on one end of the clamping rod away from the limiting seat and is connected with the clamping rod. The second force applying piece is arranged on one end of the clamping rod close to the limiting seat and is connected with the clamping rod. The application can improve the stability of the action of the curved needle frame being taken out or reset.

Description

Technical Field

[0001] This application relates to the field of sewing equipment technology, and in particular to a sewing machine bend needle clutch device and a sewing machine. Background Technology

[0002] In multi-needle sewing machines, the looper is one of the key components for forming stitches. It is typically mounted on the end of a swing shaft via a looper holder and oscillates back and forth within a set range of motion. Because the space occupied by the looper during operation is relatively confined, and surrounding parts can obstruct the movement, it is difficult for the operator to smoothly thread the bobbin through the looper's threading hole. This causes significant inconvenience for thread changes and maintenance. To solve this problem, existing technologies typically incorporate a looper ejection mechanism in multi-needle sewing machines. By controlling the connection between the looper holder and the swing shaft, the looper holder can be temporarily separated from the swing shaft during non-operating periods, facilitating threading operations.

[0003] Existing bend ejection mechanisms mainly consist of a pull rod fixedly mounted on the frame and a locking rod mounted on the bend holder. During operation, pulling the pull rod displaces the locking rod, causing it to disengage from the limiting seat on the frame, thus releasing the constraint on the bend holder. The bend holder can then eject under spring force. However, during the movement of the locking rod by the pull rod, structural clearances or assembly errors can easily cause deviations in the movement path. This can lead to the locking rod failing to disengage accurately and reliably from the limiting seat, resulting in unstable ejection or resetting of the bend holder and reducing the reliability of the bend ejection. Utility Model Content

[0004] Therefore, it is necessary to provide a sewing machine looper clutch device that can solve the above problems.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] This application relates to the field of sewing equipment technology, and in particular to a sewing machine bend needle clutch device and a sewing machine.

[0007] A needle looper clutch device for a sewing machine is installed in the sewing machine housing and includes a needle looper holder for carrying the needle and a clutch mechanism. The needle looper holder is rotatably mounted on a drive shaft and has a tendency to move from a first position to a second position. The clutch mechanism includes:

[0008] A limiting seat is used to fix the transmission shaft, and a limiting part is provided on the limiting seat;

[0009] A snap-fit ​​lever is disposed on the bent needle holder and is movable in a first direction; the snap-fit ​​lever is confined to the limiting portion.

[0010] A pull rod assembly is rotatably mounted on the housing and is movable in a first direction. The pull rod assembly includes a pull rod, a first force-applying member, and a second force-applying member. The pull rod is rotatably mounted on the housing. The first force-applying member and the second force-applying member are disposed on the pull rod. The first force-applying member is disposed at the end of the locking rod away from the limiting seat and is connected to the locking rod. The second force-applying member is disposed at the end of the locking rod close to the limiting seat and is connected to the locking rod.

[0011] When the pull rod moves along the first direction, the first force-applying member and the second force-applying member move synchronously along the first direction with the pull rod, so that the locking rod disengages from the limiting part and allows the bent needle frame to move from the first position to the second position.

[0012] It is understood that this application, by setting a pull rod assembly including a first force-applying component and a second force-applying component, allows the pull rod to move along a first direction when subjected to an external force. The first and second force-applying components then apply forces to the locking rod, enabling the locking rod to move along the first direction together with the pull rod. By setting two force-bearing points on the locking rod, the locking rod can move smoothly and reliably along the first direction and disengage from the limiting seat, thereby improving the stability of the needle holder disengagement or resetting action.

[0013] In one embodiment, the limiting part is configured as a limiting hole, the second force-applying member is disposed on the side of the limiting seat away from the snap-fit ​​rod, and the second force-applying member is provided with a protrusion facing the limiting hole, the protrusion being able to extend into the limiting hole and abut against the snap-fit ​​rod.

[0014] In one embodiment, the pull rod assembly further includes a positioning member, which is mounted on the housing, and the second force-applying member has a positioning engagement portion, through which the second force-applying member engages with the positioning member for positioning.

[0015] It is understandable that by setting a positioning component to position the second force-applying component, it is possible to ensure that the second force-applying component can accurately extend into the limiting hole and abut against the locking rod, thus preventing the locking rod from shifting due to the inability to accurately apply force to the locking rod caused by the positional deviation of the second force-applying component.

[0016] In one embodiment, the first force-applying member is disposed on the pull rod and has an elongated hole, and a protrusion is provided at one end of the snap-fit ​​rod away from the limiting seat. The protrusion extends radially outward along the snap-fit ​​rod, and the snap-fit ​​rod passes through the elongated hole and abuts against the edge of the elongated hole through the protrusion.

[0017] In response to external pulling force, the pull rod drives the first force-applying member to move along the first direction, and the first force-applying member drives the locking rod to move along the first direction. When the bent needle frame moves from the first position to the second position, the locking rod moves within the elongated hole.

[0018] Understandably, by setting an elongated hole, when the first and second force-applying components drive the locking rod to disengage from the limiting seat, the locking rod can move along the elongated hole. When the bending needle frame moves from the first position to the second position, the locking rod moves within the elongated hole, which can avoid the problem of the first force-applying component hindering the pop-out of the bending needle frame.

[0019] In one embodiment, the pull rod assembly further includes a pressure plate disposed on the pull rod and abutting against the end of the locking rod away from the limiting seat.

[0020] In one embodiment, the pressure plate is provided with a limiting protrusion on the side facing the locking rod, and the pressure plate abuts against the locking rod through the limiting protrusion;

[0021] When the bent needle holder is in the first position, the limiting protrusion abuts against the locking rod.

[0022] In one embodiment, the pull rod assembly further includes a first mounting member and a first elastic member, the first mounting member being disposed on the pull rod, the first elastic member being disposed on the pull rod, and one end abutting against the first mounting member and the other end abutting against the pressure plate.

[0023] In one embodiment, the sewing machine looper clutch further includes a limiting ring, which is sleeved on the snap-fit ​​rod and located on the side of the first force-applying member away from the protrusion, and abuts against the second force-applying member.

[0024] In one embodiment, the looper frame is provided with a mounting part, and the sewing machine looper clutch device further includes a second mounting member and a second elastic member. The locking rod passes through the mounting part and is movable relative to the mounting part in a first direction. The second mounting member and the second elastic member are both provided on the locking rod, and one end of the second elastic member abuts against the second mounting member, and the other end abuts against the mounting part.

[0025] This application also provides the following technical solutions:

[0026] A sewing machine includes a sewing machine looper clutch as described in any of the above embodiments.

[0027] Compared with the prior art, the sewing machine looper clutch device is equipped with a pull rod assembly including a first force-applying component and a second force-applying component. When the pull rod is subjected to an external force, it drives the first and second force-applying components to move along a first direction. The first and second force-applying components apply forces to the locking rod respectively, which enables the locking rod to move together with the pull rod along the first direction. By setting two force-bearing points on the locking rod, the locking rod can move smoothly and reliably along the first direction and disengage from the limiting seat, thereby improving the stability of the looper frame disengagement or reset action. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural diagram of the sewing machine provided in this application.

[0030] Figure 2 For this application Figure 1 Enlarged view of point A in the middle.

[0031] Figure 3 A schematic diagram of the sewing machine looper clutch device provided in this application in the second position from one perspective.

[0032] Figure 4 This is a schematic diagram of the sewing machine looper clutch device provided in this application in the second position from another perspective.

[0033] Figure 5 An exploded view of the sewing machine looper clutch device provided in this application.

[0034] Figure 6 A schematic diagram of the sewing machine looper clutch device provided in this application when it is in the second position.

[0035] Figure 7 For this application Figure 6 Enlarged view of point B in the middle.

[0036] The component labels are as follows:

[0037] 100. Sewing machine looper clutch device; 10. Looper holder; 11. Mounting part; 20. Clutch mechanism; 30. Limiting seat; 31. Limiting part; 311. Limiting hole; 40. Snap-fit ​​rod; 41. Limiting post; 42. Protrusion; 50. Pull rod assembly; 51. Pull rod; 52. First force-applying component; 521. Elongated hole; 53. Second force-applying component; 531. Protruding post; 54. Positioning component; 55. Positioning mating part; 56. Pressure plate; 57. First mounting component; 58. First elastic component; 59. Handle; 60. Limiting ring; 70. Second mounting component; 80. Second elastic component;

[0038] 200. Sewing machine; 201. Machine housing; 202. Drive shaft. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figures 1 to 7 This application provides a needle looper clutch device 100 for a sewing machine. The sewing machine 200 includes a housing 201 and a drive shaft 202. The needle looper clutch device 100 is mounted on the housing 201 of the sewing machine 200 and includes a needle looper holder 10 for carrying the needle and a clutch mechanism 20. The needle looper holder 10 is rotatably mounted on the drive shaft 202 and has a tendency to move from a first position to a second position. Typically, a torsion spring is used to connect the needle looper holder 10 and the drive shaft 202 to give the needle looper holder 10 the tendency to move from the first position to the second position. Here, the first position is the position where the needle looper holder 10 can rotate with the drive shaft 202, and the second position is the position where the needle looper holder 10 is disengaged from the drive shaft 202.

[0045] Specifically, the sewing machine looper clutch device 100 includes a limiting seat 30, a locking rod 40, and a pull rod assembly 50. The limiting seat 30 is fixed to the drive shaft 202, and a limiting part 31 is provided on the limiting seat 30. The locking rod 40 is disposed on the looper frame 10 and can move in the first direction x. The locking rod 40 can be limited to the limiting part 31. The pull rod assembly 50 is rotatably mounted on the machine housing 201 and can move in the first direction x. The pull rod assembly 50 includes a pull rod 51, a first force-applying member 52, and a second force-applying member 53. The pull rod 51 is rotatably mounted on the machine housing 201. 1. A first force-applying component 52 and a second force-applying component 53 are disposed on the pull rod 51. The first force-applying component 52 is disposed at the end of the locking rod 40 away from the limiting seat 30 and is connected to the locking rod 40. The second force-applying component 53 is disposed at the end of the locking rod 40 close to the limiting seat 30 and is connected to the locking rod 40. When the pull rod 51 moves along the first direction x, the first force-applying component 52 and the second force-applying component 53 move synchronously with the pull rod 51 along the first direction x, so that the locking rod 40 disengages from the limiting part 31 and allows the bending needle holder 10 to move from the first position to the second position. Thus, by setting up a pull rod assembly 50 including a first force-applying member 52 and a second force-applying member 53, the pull rod 51 drives the first force-applying member 52 and the second force-applying member 53 to move along the first direction x when subjected to an external force. The first force-applying member 52 and the second force-applying member 53 respectively apply force to the locking rod 40, so that the locking rod 40 moves together with the pull rod 51 along the first direction x. By setting two force-bearing points on the locking rod 40, the locking rod 40 can move smoothly and reliably along the first direction x and disengage from the limiting seat 30, thereby improving the stability of the disengagement or resetting action of the bent needle holder 10.

[0046] like Figure 4 As shown, the limiting part 31 is configured as a limiting hole 311, and the snap-fit ​​rod 40 is provided with a limiting post 41 at one end facing the limiting hole 311. The limiting post 41 can extend into the limiting hole 311, thereby limiting the snap-fit ​​rod 40 to the limiting seat 30, so that the bent needle frame 10 is fixed in the first position.

[0047] In this embodiment, the limiting post 41 is frustum-shaped, and the closer to the end, the smaller the cross-sectional diameter of the limiting post 41 is. The limiting hole 311 is flared and can match the shape of the limiting post 41. In this way, it can guide the entry of the limiting post 41 on the one hand, and cooperate with the limiting post 41 to achieve limiting on the other hand.

[0048] like Figures 2 to 5As shown, in one embodiment, a protrusion 42 is provided at the end of the snap-fit ​​rod 40 away from the limiting seat 30. The first force-applying member 52 is provided on the pull rod 51 and has an elongated hole 521. The protrusion 42 extends outward along the radial direction of the snap-fit ​​rod 40. The snap-fit ​​rod 40 is provided through the elongated hole 521 and abuts against the edge of the elongated hole 521 through the protrusion 42. In response to external pulling force, the pull rod 51 drives the first force-applying member 52 to move along the first direction x. The first force-applying member 52 drives the snap-fit ​​rod 40 to move along the first direction x. When the bent needle holder 10 moves from the first position to the second position, the snap-fit ​​rod 40 moves within the elongated hole 521. Thus, by setting the elongated hole 521, when the first force-applying member 52 and the second force-applying member 53 drive the locking rod 40 to disengage from the limiting seat 30, the locking rod 40 can move along the elongated hole 521. When the bending needle frame 10 moves from the first position to the second position, the locking rod 40 moves within the elongated hole 521, which can avoid the problem of the first force-applying member 52 hindering the pop-out of the bending needle frame 10.

[0049] Furthermore, the second force-applying member 53 is disposed on the side of the limiting seat 30 opposite to the locking rod 40, and the second force-applying member 53 is provided with a protrusion 531 facing the limiting hole 311. The protrusion 531 can extend into the limiting hole 311 and abut against the locking rod 40. By providing a protrusion 531 that can extend into the limiting hole 311 and abut against the locking rod 40, when the pull rod 51 is pulled out along the first direction x, the protrusion 531 pushes against the locking rod 40, which can form an axial thrust at the end of the locking rod 40 along the first direction x, preventing the locking rod 40 from deviating during the pushing process and causing jamming, thereby making the unlocking action smoother and less strenuous.

[0050] In this embodiment, the first force-applying member 52 and the second force-applying member 53 are configured as plate-shaped structures and are limited to the pull rod 51 by structures such as retaining rings and snap rings.

[0051] like Figures 2 to 5 and Figure 7 As shown, the pull rod assembly 50 also includes a positioning member 54, which is mounted on the housing 201. The second force-applying member 53 has a positioning mating part 55, and the second force-applying member 53 is positioned by cooperating with the positioning member 54 through the positioning mating part 55. In this way, by setting the positioning member 54 to position the second force-applying member 53, it can be ensured that the second force-applying member 53 can accurately extend into the limiting hole 311 and abut against the locking rod 40, preventing the locking rod 40 from shifting due to the positional deviation of the second force-applying member 53, which would prevent the locking rod 40 from shifting.

[0052] In this embodiment, the positioning member 54 is configured as a positioning post fixed on the housing 201, and the positioning mating part 55 is configured as a positioning hole. The positioning post is disposed in the positioning hole, and the positioning of the second force-applying member 53 can be achieved through the cooperation of the positioning post and the positioning hole.

[0053] In one embodiment, the pull rod assembly 50 further includes a pressure plate 56 disposed on the pull rod 51 and abutting against the end of the locking rod 40 away from the limiting seat 30. The pressure plate 56 is used to position the locking rod 40.

[0054] Furthermore, a limiting protrusion is provided on the side of the pressure plate 56 facing the locking rod 40, and the pressure plate 56 abuts against the locking rod 40 through the limiting protrusion; when the looper frame 10 is in the first position, the limiting protrusion abuts against the locking rod 40. By using the limiting protrusion to abut against the locking rod 40, the locking rod 40 can be prevented from dislodging from the limiting seat 30 during the use of the looper frame 10, thereby ensuring the reliability of the sewing machine looper clutch device 100.

[0055] like Figures 1 to 7 As shown, the pull rod assembly 50 also includes a first mounting member 57 and a first elastic member 58. The first mounting member 57 is disposed on the pull rod 51, and the first elastic member 58 is disposed on the pull rod 51, with one end abutting against the first mounting member 57 and the other end abutting against the pressure plate 56.

[0056] Preferably, the first mounting member 57 is configured as a gasket, which is sleeved on the pull rod 51 and abuts against the first elastic member 58. By setting the gasket, one end of the first elastic member 58 is fixed by the gasket, and the first elastic member 58 abuts against the pressure plate 56, so that the pressure plate 56 can be continuously subjected to the pushing force, preventing the pressure plate 56 from moving and causing the limiting protrusion to fail to abut against the locking rod 40.

[0057] Here, the first elastic element 58 can be configured as a spring, tower spring or other structure. A structure such as a gasket or retaining ring can also be provided between the first elastic element 58 and the pressure plate 56 so that the first elastic element 58 can provide more uniform pressure to the pressure plate 56, so that the pressure plate 56 is subjected to force more smoothly.

[0058] like Figure 1 and Figure 6 As shown, the lever assembly 50 also includes a handle 59, which is located at the end of the lever 51 away from the limit seat 30 and outside the housing 201. By pulling the handle 59, the user can drive the lever 51, the first force-applying member 52, and the second force-applying member 53 to move along the first direction.

[0059] like Figures 2 to 5 As shown, in one embodiment, the sewing machine looper clutch device 100 further includes a limiting ring 60, which is sleeved on the locking rod 40 and located on the side of the first force-applying member 52 away from the protrusion 42, and abuts against the second force-applying member 53. Here, the limiting ring 60 can be configured as a retaining ring, a retaining ring, or other structures.

[0060] In one embodiment, a mounting portion 11 is provided on the looper holder 10. The sewing machine looper clutch device 100 further includes a second mounting member 70 and a second elastic member 80. The locking rod 40 passes through the mounting portion 11 and is movable relative to the mounting portion 11 in a first direction x. The second mounting member 70 and the second elastic member 80 are both disposed on the locking rod 40, with one end of the second elastic member 80 abutting against the second mounting member 70 and the other end abutting against the mounting portion 11. Here, the function and structural selection of the second mounting member 70 and the second elastic member 80 can be referred to the first mounting member 57 and the first elastic member 58, and will not be elaborated here.

[0061] This application also provides the following technical solutions:

[0062] A sewing machine 200 includes a sewing machine looper clutch 100 as described in any of the above embodiments.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A sewing machine looper clutch device, mounted on the housing (201) of a sewing machine (200), and comprising a looper holder (10) for carrying a looper and a clutch mechanism (20), said looper holder (10) being rotatably mounted on a drive shaft (202) and having a tendency to move from a first position to a second position, characterized in that, The clutch mechanism (20) includes: A limiting seat (30) is used to fix the transmission shaft (202), and a limiting part (31) is provided on the limiting seat (30); A snap-fit ​​rod (40) is disposed on the bent needle holder (10) and is movable in a first direction. The snap-fit ​​rod (40) is limited to the limiting part (31). A pull rod assembly (50) is rotatably mounted on the housing (201) and is movable in a first direction. The pull rod assembly (50) includes a pull rod (51), a first force-applying member (52), and a second force-applying member (53). The pull rod (51) is rotatably mounted on the housing (201). The first force-applying member (52) and the second force-applying member (53) are disposed on the pull rod (51). The first force-applying member (52) is disposed at the end of the snap-fit ​​rod (40) away from the limiting seat (30) and is connected to the snap-fit ​​rod (40). The second force-applying member (53) is disposed at the end of the snap-fit ​​rod (40) close to the limiting seat (30) and is connected to the snap-fit ​​rod (40). When the pull rod (51) moves along the first direction, the first force-applying member (52) and the second force-applying member (53) move synchronously along the first direction with the pull rod (51), so that the snap-fit ​​rod (40) disengages from the limiting part (31) and allows the bent needle holder (10) to move from the first position to the second position.

2. The sewing machine looper clutch device according to claim 1, characterized in that, The limiting part (31) is configured as a limiting hole (311). The second force-applying member (53) is disposed on the side of the limiting seat (30) away from the snap-fit ​​rod (40). The second force-applying member (53) is provided with a protrusion (531) facing the limiting hole (311). The protrusion (531) can extend into the limiting hole (311) and abut against the snap-fit ​​rod (40).

3. The sewing machine looper clutch device according to claim 2, characterized in that, The pull rod assembly (50) further includes a positioning element (54), which is installed on the housing (201). The second force-applying element (53) has a positioning mating part (55), and the second force-applying element (53) is positioned in cooperation with the positioning element (54) through the positioning mating part (55).

4. The sewing machine looper clutch device according to claim 1, characterized in that, The first force-applying member (52) is disposed on the pull rod (51) and has an elongated hole (521). The end of the snap-fit ​​rod (40) away from the limiting seat (30) is provided with a protrusion (42). The protrusion (42) extends outward along the radial direction of the snap-fit ​​rod (40). The snap-fit ​​rod (40) passes through the elongated hole (521) and abuts against the edge of the elongated hole (521) through the protrusion (42). In response to external pulling force, the pull rod (51) drives the first force-applying member (52) to move in the first direction, and the first force-applying member (52) drives the snap-fit ​​rod (40) to move in the first direction. When the bent needle frame (10) moves from the first position to the second position, the snap-fit ​​rod (40) moves in the elongated hole (521).

5. The sewing machine looper clutch device according to claim 4, characterized in that, The pull rod assembly (50) further includes a pressure plate (56), which is disposed on the pull rod (51) and abuts against the end of the snap-fit ​​rod (40) away from the limiting seat (30).

6. The sewing machine looper clutch device according to claim 5, characterized in that, The pressure plate (56) is provided with a limiting protrusion on the side facing the snap-fit ​​rod (40), and the pressure plate (56) abuts against the snap-fit ​​rod (40) through the limiting protrusion; When the bent needle holder (10) is in the first position, the limiting protrusion abuts against the locking rod (40).

7. The sewing machine looper clutch device according to claim 5, characterized in that, The pull rod assembly (50) further includes a first mounting member (57) and a first elastic member (58). The first mounting member (57) is disposed on the pull rod (51), and the first elastic member (58) is disposed on the pull rod (51), with one end abutting against the first mounting member (57) and the other end abutting against the pressure plate (56).

8. The sewing machine looper clutch device according to claim 4, characterized in that, The sewing machine looper clutch device (100) further includes a limiting ring (60), which is sleeved on the snap-fit ​​rod (40) and located on the side of the first force-applying member (52) away from the protrusion (42), and abuts against the second force-applying member (53).

9. The sewing machine looper clutch device according to claim 1, characterized in that, The looper frame (10) is provided with a mounting part (11). The sewing machine looper clutch device (100) also includes a second mounting member (70) and a second elastic member (80). The locking rod (40) passes through the mounting part (11) and is movable relative to the mounting part (11) in a first direction. The second mounting member (70) and the second elastic member (80) are both provided on the locking rod (40). One end of the second elastic member (80) abuts against the second mounting member (70), and the other end abuts against the mounting part (11).

10. A sewing machine, characterized in that, Includes the sewing machine looper clutch device (100) as described in any one of claims 1-9.

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