Sewing machine presser foot lifting device and sewing machine

Abstract

The application relates to the technical field of sewing machines, in particular to a sewing machine presser foot lifting device and a sewing machine. The sewing machine presser foot lifting device is installed on a machine shell and comprises a first presser foot assembly and a second presser foot assembly. The first presser foot assembly comprises a first driving piece, a transmission mechanism and a first connecting rod. The first driving piece can drive the first connecting rod to rotate through the transmission mechanism. The first connecting rod is used for transmission connection of a first presser foot. The second presser foot assembly comprises a second driving piece and a second connecting rod. One end of the second connecting rod is connected with the second driving piece and can rotate under the driving of the second driving piece. The other end of the second connecting rod is used for transmission connection of a second presser foot. One of the first connecting rod and the second connecting rod is configured as a hollow sleeve, and the other is configured as a movable rod. The movable rod is arranged in the hollow sleeve and can rotate relative to the hollow sleeve. The application can improve the utilization rate of the internal space of the sewing machine.

Description

Technical Field

[0001] This application relates to the field of sewing machine technology, and in particular to a sewing machine presser foot lifting device and a sewing machine. Background Technology

[0002] During sewing machine operation, the presser foot, as a key component for fixing materials, directly affects sewing efficiency and quality through its lifting and pressing action. With the widespread use of composite fabrics, multi-layered fabrics, or special processes (such as quilting and appliqué embroidery), a single presser foot is insufficient to meet complex sewing needs, requiring the use of presser feet of different sizes to assist in sewing.

[0003] In existing presser foot control technologies, two independently set control systems are usually used: two independent drive components are set in the sewing machine, and the lifting and pressing actions of the presser feet are controlled by two independent connecting rods. The transmission mechanism requires a separate transmission component to be designed for each connecting rod to control the lifting and pressing action of the presser foot. The components of this design are scattered in the machine casing, resulting in redundant structural layout and low utilization of the internal space of the sewing machine. Utility Model Content

[0004] Therefore, it is necessary to provide a sewing machine presser foot lifting device and a sewing machine that can solve the above problems.

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

[0006] A sewing machine presser foot lifting device is installed in the machine housing and includes a first presser foot assembly and a second presser foot assembly. The first presser foot assembly is used to control the movement of a first presser foot, and the second presser foot assembly is used to control the movement of a second presser foot. The first presser foot assembly includes a first driving member, a transmission mechanism, and a first connecting rod. The first driving member can drive the first connecting rod to rotate through the transmission mechanism, and the first connecting rod is used to drive the first presser foot.

[0007] The second presser foot assembly includes a second driving member and a second connecting rod. One end of the second connecting rod is connected to the second driving member and can rotate under the drive of the second driving member, while the other end is used for transmission connection to the second presser foot.

[0008] In this configuration, one of the first connecting rod and the second connecting rod is configured as a hollow sleeve, and the other is configured as a movable rod. The movable rod passes through the hollow sleeve and is capable of rotating relative to the hollow sleeve.

[0009] It is understood that this application uses a hollow sleeve with a movable rod passing through it and rotating relative to it. This sleeve-like design allows the first and second connecting rods to share structural space when controlling the first and second presser feet, thus improving the device's integration. Furthermore, by configuring one of the first and second connecting rods as a hollow sleeve and the other as a movable rod, the structure of the first and second presser foot assemblies becomes more compact, reducing their footprint within the sewing machine and improving the utilization rate of the sewing machine's internal space.

[0010] In one embodiment, the sewing machine presser foot lifting device further includes a thickness detector, which is mounted on the first presser foot and electrically connected to the first drive component to detect the thickness of the material and send an electrical signal to the first drive component.

[0011] In one embodiment, the transmission mechanism includes at least a first gear and a second gear that mesh with each other. The first gear is connected to the first driving member and can rotate under the drive of the first driving member. The second gear is sleeved on the hollow sleeve and is circumferentially limited by the hollow sleeve.

[0012] In one embodiment, the transmission mechanism further includes a bracket and a third gear, the bracket being mounted on the housing, and the third gear being rotatably mounted on the bracket and located between the first gear and the second gear, and meshing with the first gear and the second gear respectively.

[0013] In one embodiment, the movable rod includes a reduced-diameter section through which the reduced-diameter section of the movable rod passes.

[0014] In one embodiment, the first connecting rod is configured as a hollow sleeve, and the second connecting rod is configured as a movable rod that passes through the hollow sleeve and is rotatable relative to the first connecting rod;

[0015] The first presser foot assembly further includes a transmission cam and a support frame. The transmission cam is fixed to the first connecting rod and has a protrusion. The support frame extends along a first direction and one end of the support frame is hinged to the protrusion, while the other end is used to connect to the first presser foot.

[0016] The first direction is set at an angle to the axis of the hollow sleeve.

[0017] In one embodiment, the first presser foot assembly includes a bushing that is located within the housing, and the first connecting rod passes through the bushing and is rotatable relative to the bushing.

[0018] In one embodiment, the first presser foot assembly further includes a sleeve and an elastic element. One end of the support frame is provided with a connecting post. The sleeve is sleeved on the connecting post, and the elastic element is sleeved on the connecting post. One end of the elastic element abuts against the sleeve, and the other end abuts against the support frame.

[0019] The protrusion is hinged to the sleeve.

[0020] In one embodiment, the second presser foot assembly further includes a transmission rod and a linkage mechanism, the transmission rod extending along a first direction and one end of the transmission rod being connected to a second connecting rod, the linkage mechanism passing through the support frame and hinged to the support frame;

[0021] Furthermore, one side of the linkage mechanism is connected to the transmission rod, and the other side is used to connect to the second pressure foot.

[0022] This application also provides the following technical solutions:

[0023] A sewing machine includes a sewing machine presser foot lifting device as described in any of the above embodiments.

[0024] Compared with existing technologies, the sewing machine presser foot lifting device uses a hollow sleeve with a movable rod passing through it and rotating relative to the sleeve. This sleeve-like design allows the first and second connecting rods to share structural space when controlling the first and second presser feet, improving the device's integration. Furthermore, by configuring one of the first and second connecting rods as a hollow sleeve and the other as a movable rod, the structure of the first and second presser foot assemblies becomes more compact, reducing their footprint within the sewing machine's internal space and thus improving the utilization rate of the sewing machine's internal space. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the sewing machine structure provided in this application.

[0027] Figure 2 A schematic diagram of the sewing machine presser foot lifting device in the first embodiment provided in this application.

[0028] Figure 3 The first connecting rod provided in this application is a hollow sleeve, and the second connecting rod is a cross-sectional view of a movable rod.

[0029] Figure 4 An exploded view of the presser foot lifting device of the sewing machine in the first embodiment provided in this application.

[0030] Figure 5 A schematic diagram of the sewing machine presser foot lifting device in the second embodiment provided in this application.

[0031] Figure 6 A schematic diagram of the sewing machine presser foot lifting device in the third embodiment provided in this application.

[0032] Figure 7 The first connecting rod provided in this application is a movable rod, and the second connecting rod is a cross-sectional view of a hollow sleeve.

[0033] The component labels are as follows:

[0034] 100. Sewing machine; 101. Machine housing; 102. First presser foot; 103. Second presser foot; 104. Needle bar assembly; 105. Needle bar; 106. Housing;

[0035] 200. Sewing machine presser foot lifting device; 10. First presser foot assembly; 11. First driving component; 12. Transmission mechanism; 121. First gear; 122. Second gear; 123. Bracket; 124. Third gear; 125. Fourth gear; 13. First connecting rod; 14. Transmission cam; 141. Protrusion; 15. Support frame; 151. Connecting column; 152. Screw; 16. Sleeve; 161. Opening; 17. Elastic element; 18. Bushing; 181. Lubrication hole; 20. Second presser foot assembly; 21. Second connecting rod; 22. Transmission rod; 23. Linkage mechanism; 231. First connecting rod; 232. Transmission block; 233. Second connecting rod; 30. Hollow sleeve; 40. Movable rod; 41. Reducing diameter section; 50. Thickness detector. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Please see Figures 1 to 7This application provides a sewing machine 100, which includes a sewing machine presser foot lifting device 200, a machine housing 101, a first presser foot 102, a second presser foot 103, and a needle bar assembly 104. The sewing machine presser foot lifting device 200 is mounted on the machine housing 101 and includes a first presser foot assembly 10 and a second presser foot assembly 20. The first presser foot assembly 10 controls the movement of the first presser foot 102, and the second presser foot assembly 20 controls the movement of the second presser foot 103. In this application, the second presser foot 103 (i.e., the small presser foot) can be confined to the needle bar assembly 104 and rotated under the drive of the needle bar assembly 104 for feeding material. The first presser foot 102 (i.e., the large presser foot) is disposed outside the second presser foot 103 and the needle bar 105 for continuously providing pressure to the material. Here, the needle bar assembly 104 includes a needle bar 105, a housing 106, and a drive motor. The needle bar 105 and the second presser foot 103 are confined within the housing 106 and are connected to the drive motor via the housing 106, enabling them to rotate under the drive of the drive motor. This structure is quite common in the prior art and will not be described in detail here.

[0042] Specifically, the first presser foot assembly 10 includes a first driving member 11, a transmission mechanism 12, and a first connecting rod 13; the first driving member 11 can drive the first connecting rod 13 to rotate through the transmission mechanism 12, and the first connecting rod 13 is used to drive the first presser foot 102; the second presser foot assembly 20 includes a second driving member and a second connecting rod 21, one end of the second connecting rod 21 is connected to the second driving member and can rotate under the drive of the second driving member, and the other end is used to drive the second presser foot 103; wherein, one of the first connecting rod 13 and the second connecting rod 21 is configured as a hollow sleeve 30, and the other is configured as a movable rod 40, the movable rod 40 passes through the hollow sleeve 30 and can rotate relative to the hollow sleeve 30. Thus, by setting a hollow sleeve 30, the movable rod 40 passes through the hollow sleeve 30 and can rotate relative to the hollow sleeve 30, that is, by adopting a sleeve design, when the first connecting rod 13 and the second connecting rod 21 are used to control the first presser foot 102 and the second presser foot 103 to move, the first connecting rod 13 and the second connecting rod 21 can share structural space, improving the integration of the device; at the same time, by configuring one of the first connecting rod 13 and the second connecting rod 21 as a hollow sleeve 30 and the other as a movable rod 40, the structural arrangement of the first presser foot assembly 10 and the second presser foot assembly 20 can be made more compact, reducing the occupation of the first presser foot assembly 10 and the second presser foot assembly 20 in the internal space of the sewing machine 100, thereby improving the utilization rate of the internal space of the sewing machine 100.

[0043] In one embodiment, the first drive element 11 is configured as a stepper motor or a servo motor, etc.

[0044] Preferably, the first driving component 11 is configured as a stepper motor. By configuring the first driving component 11 as a stepper motor, the first connecting rod 13 can be controlled to rotate at a lower cost.

[0045] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the transmission mechanism 12 is configured as a gear structure, and includes at least a first gear 121 and a second gear 122 that mesh with each other. The first gear 121 is connected to the first driving member 11 and can rotate under the drive of the first driving member 11. The second gear 122 is sleeved on the hollow sleeve 30 and is circumferentially limited with the hollow sleeve 30. In this way, the rotational motion of the first driving member 11 can be accurately transmitted to the hollow sleeve 30 through the gear structure, so that the first driving member 11 can accurately control the rotation of the hollow sleeve 30, thereby improving the accuracy of the control of the first pressure foot 102.

[0046] In one embodiment, such as Figure 2 As shown, the transmission mechanism 12 also includes a bracket 123 and a third gear 124. The bracket 123 is mounted on the housing 101, and the third gear 124 is rotatably mounted on the bracket 123 and located between the first gear 121 and the second gear 122, meshing with both gears. Thus, by providing three gears, the transmission ratio can be increased, allowing the rotational motion output by the motor to achieve a greater deceleration and force amplification effect when transmitted to the first connecting rod 13, thereby reducing the requirement for the motor's output torque.

[0047] In another embodiment, such as Figure 4 As shown, the transmission mechanism 12 also includes a bracket 123, a third gear 124, and a fourth gear 125. The bracket 123 is mounted on the housing 101. The third gear 124 and the fourth gear 125 are rotatably mounted on the bracket 123 and located between the first gear 121 and the second gear 122. The third gear 124 and the fourth gear 125 are circumferentially limited and mesh with the first gear 121 and the second gear 122, respectively. Thus, by setting four gears, the transmission ratio can be increased, allowing the rotational motion output by the motor to achieve a greater deceleration and force amplification effect when transmitted to the first connecting rod 13, thereby reducing the requirement for the motor's output torque. Simultaneously, by adjusting the tooth ratio of the multi-stage gears, such as adjusting the tooth ratio of the driving wheel to the driven wheel, the speed and force of the presser foot's lifting can be precisely controlled, achieving precise adjustment of the pressure value of the presser foot acting on the sewing material, which can improve sewing quality and process adaptability. Of course, it is not limited to a four-gear structure; the transmission mechanism 12 can also be configured with a five-gear, six-gear, or other structures so that the first driving member 11 can drive the hollow sleeve 30 to rotate.

[0048] In one embodiment, such as Figure 2 and Figure 3 As shown, the first connecting rod 13 is configured as a hollow sleeve 30, and the second connecting rod 21 is configured as a movable rod 40 passing through the hollow sleeve 30 and capable of rotating relative to the first connecting rod 13. The first presser foot assembly 10 also includes a transmission cam 14 and a support frame 15. The transmission cam 14 is fixed to the first connecting rod 13 and has a protrusion 141. The support frame 15 extends along a first direction, and one end of the support frame 15 is hinged to the protrusion 141, while the other end is used to connect to the first presser foot 102. The first direction is angled to the axis of the hollow sleeve 30. Thus, by hinged between the protrusion 141 of the transmission cam 14 and the support frame 15, the rotational motion of the first connecting rod 13 is converted into the up-and-down movement of the support frame 15 and the first presser foot 102, allowing the first connecting rod 13 to control the lifting and pressing actions of the first presser foot 102 through rotation.

[0049] Here, the angle between the first direction and the axis of the hollow sleeve 30 ranges from 80° to 100°. For example, the first direction can be selected to be at an angle of 80°, 90°, or 100° to the axis. In this embodiment, the first direction is perpendicular to the circumference of the hollow sleeve 30.

[0050] In another embodiment, such as Figure 6 and Figure 7 As shown, the second connecting rod 21 is configured as a hollow sleeve 30, and the first connecting rod 13 is configured as a movable rod 40 that passes through the hollow sleeve 30 and is rotatable relative to the second connecting rod 21. The remaining structure is the same as in the embodiment where the first connecting rod 13 is configured as a hollow sleeve 30, and will not be described in detail here.

[0051] like Figure 2 and Figure 4 As shown, the first presser foot assembly 10 also includes a sleeve 16 and an elastic element 17. A connecting post 151 is provided at one end of the support frame 15. The sleeve 16 is sleeved on the connecting post 151, and the elastic element 17 is sleeved on the connecting post 151. One end of the elastic element 17 abuts against the sleeve 16, and the other end abuts against the support frame 15. The protrusion 141 is hinged to the sleeve 16. Thus, by setting the sleeve 16, so that the sleeve 16 is sleeved on the connecting post 151 and the elastic element abuts against the sleeve 16, the sleeve 16, the connecting post 151, and the elastic element 17 can be limited in the axial direction. This allows the sleeve 16 to drive the elastic element 17 to apply a force along the first direction to the support frame 15, thereby accurately controlling the pressure applied by the first presser foot 102 to the material along the first direction, preventing the force transmission from deviating, and enabling the first presser foot assembly 10 to accurately control the pressure of the first presser foot 102 on the material.

[0052] In one embodiment, the top of the sleeve 16 is provided with an opening 161 for the connecting post 151 to pass through, and a screw 152 is provided on the top of the support frame 15. This avoids interference between the sleeve 16 and the connecting post 151, so that when the protrusion 141 moves the sleeve 16, pressure is applied to the support frame 15 only through the elastic element 17. At the same time, by providing the screw 152, it is possible to prevent the connecting post 151 from disengaging from the sleeve 16.

[0053] Preferably, the elastic element 17 is configured as a spring or a sleeve with elastic function.

[0054] like Figure 4 As shown, the first presser foot assembly 10 includes a bushing 18, which is located within the housing 101. The first connecting rod 13 passes through the bushing 18 and is rotatable relative to the bushing 18. Thus, by providing support and limiting the first connecting rod 13 with the bushing 18, the stability and coaxiality of the first connecting rod 13 during rotation can be ensured, preventing the first connecting rod 13 from wobbling, thereby reducing wear and improving durability.

[0055] In one embodiment, the bushing 18 is provided with a lubrication hole 181. In this way, by providing a lubrication hole 181, lubricant can be added between the first connecting rod 13 and the bushing 18 through the lubrication hole 181. When the first connecting rod 13 and the bushing 18 move relative to each other, friction can be reduced, thereby avoiding wear on the first connecting rod 13 and the bushing 18 and improving their service life.

[0056] In one embodiment, the movable rod 40 includes a reduced-diameter section 41, through which a hollow sleeve 30 passes. By configuring the section connecting the movable rod 40 and the hollow sleeve 30 as the reduced-diameter section 41, and ensuring that the diameter of the reduced-diameter section 41 is smaller than the diameter of the hollow sleeve 30, deformation of the shaft end of the first connecting rod 13 after the gear is fixed can be avoided, preventing jamming of the two shafts and enhancing the stability of the sewing machine presser foot lifting device 200.

[0057] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the second presser foot assembly 20 also includes a transmission rod 22 and a linkage mechanism 23. The transmission rod 22 extends along a first direction and one end of the transmission rod 22 is connected to the second connecting rod 21. The linkage mechanism 23 passes through the support frame 15 and is hinged to the support frame 15. Furthermore, one side of the linkage mechanism 23 is connected to the transmission rod 22, and the other side is used to connect to the second presser foot 103. By setting the transmission rod 22 and the linkage mechanism 23, the rotational motion of the second connecting rod 21 can be converted into the up-and-down motion of the second presser foot 103, thereby controlling the lifting and pressing action of the second presser foot 103 through the second connecting rod 21.

[0058] In this embodiment, the linkage mechanism 23 includes a first link 231, a transmission block 232, and a second link 233. The transmission block 232 is hinged to the support frame 15. One end of the first link 231 is hinged to the transmission rod 22, and the other end is hinged to the transmission block 232. One end of the second link 233 is hinged to the transmission block 232, and the other end is hinged to the second pressure foot 103. Thus, when the second connecting rod 21 rotates, it first drives the transmission rod 22 to rotate. Then, through the transmission action of the first link 231, the transmission block 232, and the second link 233, the rotational motion of the second connecting rod 21 is converted into the up-and-down motion of the second pressure foot 103, so that the second connecting rod 21 can stably drive the second pressure foot 103 to perform lifting and pressing actions.

[0059] like Figure 5 As shown, the sewing machine presser foot lifting device 200 also includes a thickness detector 50. The thickness detector 50 is installed on the first presser foot 102 and electrically connected to the first drive component 11. It is used to detect the thickness of the material and send an electrical signal to the first drive component 11. Thus, by setting the thickness detector 50, when a change in material thickness is detected, the pressure of the first presser foot 102 on the material can be adjusted according to the different material thicknesses. This allows the pressure of the first presser foot 102 on the material to be dynamically adjusted, thereby keeping the pressure on the material constant. This avoids material displacement, severe indentations, and other phenomena that can occur when the material is too thin or too thick, thus improving the sewing quality during sewing.

[0060] This application also provides the following technical solutions:

[0061] A sewing machine 100 includes a sewing machine presser foot lifting device 200 as described in any of the above embodiments.

[0062] 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.

[0063] 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 presser foot lifting device, installed in the machine housing (101) and including a first presser foot assembly (10) and a second presser foot assembly (20), wherein the first presser foot assembly (10) is used to control the movement of the first presser foot (102) and the second presser foot assembly (20) is used to control the movement of the second presser foot (103); Its features are, The first presser foot assembly (10) includes a first drive member (11), a transmission mechanism (12), and a first connecting rod (13); the first drive member (11) can drive the first connecting rod (13) to rotate through the transmission mechanism (12), and the first connecting rod (13) is used to drive the first presser foot (102). The second presser foot assembly (20) includes a second driving member and a second connecting rod (21). One end of the second connecting rod (21) is connected to the second driving member and can rotate under the drive of the second driving member, and the other end is used for transmission connection to the second presser foot (103). In this configuration, one of the first connecting rod (13) and the second connecting rod (21) is configured as a hollow sleeve (30), and the other is configured as a movable rod (40). The movable rod (40) passes through the hollow sleeve (30) and is able to rotate relative to the hollow sleeve (30).

2. The sewing machine presser foot lifting device according to claim 1, characterized in that, The sewing machine presser foot lifting device (200) also includes a thickness detector (50), which is installed on the first presser foot (102) and electrically connected to the first drive member (11) to detect the thickness of the material and send an electrical signal to the first drive member (11).

3. The sewing machine presser foot lifting device according to claim 1, characterized in that, The transmission mechanism (12) includes at least a first gear (121) and a second gear (122) that mesh with each other. The first gear (121) is connected to the first driving member (11) and can rotate under the drive of the first driving member (11). The second gear (122) is sleeved on the hollow sleeve (30) and is circumferentially limited with the hollow sleeve (30).

4. The sewing machine presser foot lifting device according to claim 3, characterized in that, The transmission mechanism (12) further includes a bracket (123) and a third gear (124). The bracket (123) is used to be mounted on the housing (101). The third gear (124) is rotatably mounted on the bracket (123) and located between the first gear (121) and the second gear (122), and meshes with the first gear (121) and the second gear (122) respectively.

5. The sewing machine presser foot lifting device according to claim 3, characterized in that, The movable rod (40) includes a reduced diameter section (41), through which the reduced diameter section (41) of the movable rod (40) passes through the hollow sleeve (30).

6. The sewing machine presser foot lifting device according to claim 1, characterized in that, The first connecting rod (13) is configured as a hollow sleeve (30), and the second connecting rod (21) is configured as a movable rod (40) and passes through the hollow sleeve (30), and can rotate relative to the first connecting rod (13); The first presser foot assembly (10) further includes a transmission cam (14) and a support frame (15). The transmission cam (14) is fixed to the first connecting rod (13) and has a protrusion (141). The support frame (15) extends along a first direction and one end of the support frame (15) is hinged to the protrusion (141), and the other end is used to connect to the first presser foot (102). The first direction is set at an angle to the axis of the hollow sleeve (30).

7. The sewing machine presser foot lifting device according to claim 6, characterized in that, The first presser foot assembly (10) includes a bushing (18) which is located within the housing (101). The first connecting rod (13) passes through the bushing (18) and is rotatable relative to the bushing (18).

8. The sewing machine presser foot lifting device according to claim 6, characterized in that, The first presser foot assembly (10) further includes a sleeve (16) and an elastic element (17). One end of the support frame (15) is provided with a connecting post (151). The sleeve (16) is sleeved on the connecting post (151), and the elastic element (17) is sleeved on the connecting post (151). One end of the elastic element (17) abuts against the sleeve (16), and the other end abuts against the support frame (15). The protrusion (141) is hinged to the sleeve (16).

9. The sewing machine presser foot lifting device according to claim 6, characterized in that, The second presser foot assembly (20) also includes a transmission rod (22) and a linkage mechanism (23). The transmission rod (22) extends along a first direction and one end of the transmission rod (22) is connected to a second connecting rod (21). The linkage mechanism (23) passes through the support frame (15) and is hinged to the support frame (15). Furthermore, one side of the linkage mechanism (23) is connected to the transmission rod (22), and the other side is used to connect to the second pressure foot (103).

10. A sewing machine, characterized in that, Includes the sewing machine presser foot lifting device (200) as described in any one of claims 1-9.

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