Sewing machine feed lifting structure and sewing machine thereof

Abstract

The utility model provides a sewing machine feed lifting structure and a sewing machine thereof, and relates to the technical field of sewing machines. The sewing machine feed lifting structure comprises a driving motor, a feed lifting shaft, a first transmission mechanism and a feed rack; the driving motor is connected with the feed lifting shaft through a first transmission mechanism so as to drive the feed lifting shaft to rotate around the axis of the feed lifting shaft. A first crank is installed on the feed lifting shaft, a feeding tooth assembly is arranged on the feed rack, a sliding groove extending in the length direction of the feed rack is formed in the feed rack, and part of the first crank is located in the sliding groove and can slide relative to the sliding groove so as to drive the feeding tooth assembly to ascend and descend. According to the feed lifting structure of the sewing machine, the height of the feeding tooth assembly can be automatically adjusted and controlled.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular to a sewing machine tooth lifting structure and a sewing machine thereof. Background Art

[0002] A sewing machine uses one or more sewing threads to form one or more tracks on the material to interweave or sew one or more layers of material. To sew materials of varying thicknesses, the feed dog height of the sewing machine needs to be adjusted appropriately.

[0003] In related technologies, staff determine the height of the feed dog based on the thickness of the sewing material. If the current feed dog height is too high or too low, the fixing screws of the feed dog need to be loosened. After the feed dog is corrected to the correct position, the fixing screws can be tightened.

[0004] However, the above steps are all completed manually, making it difficult to control the height of the feed dog. Utility Model Content

[0005] In view of this, the present application provides a sewing machine tooth lifting structure and a sewing machine thereof, so as to realize automatic adjustment and control of the height of the feed dog assembly.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] The present application provides a sewing machine tooth lifting structure, comprising a driving motor, a tooth lifting shaft, a first transmission mechanism and a tooth frame;

[0008] The driving motor is connected to the tooth lifting shaft through the first transmission mechanism to drive the tooth lifting shaft to rotate around its own axis;

[0009] A first crank is installed on the tooth lifting shaft, a feed tooth assembly is provided on the tooth rack, and the tooth rack has a slide groove extending along the length direction of the tooth rack. Part of the first crank is located in the slide groove and can slide relative to the slide groove to drive the feed tooth assembly to rise and fall.

[0010] In a possible implementation, the first transmission mechanism includes a cam and a second crank, and the cam is sleeved on the output shaft of the drive motor;

[0011] The first end of the second crank is in contact with the cam, and the second end of the second crank is connected to the tooth lifting shaft to drive the tooth lifting shaft to swing back and forth around its own axis.

[0012] In a possible implementation, the first transmission mechanism further includes a bearing, the bearing is mounted on the first end of the second crank, and the second crank abuts against the cam through the bearing.

[0013] In a possible implementation, the first transmission mechanism further includes a connecting assembly and a second connecting member, and the first end and the second end of the second crank are respectively provided with a first through hole and a second through hole;

[0014] The connecting assembly includes a first connecting member and a first fastener. A first washer is provided between the bearing and the second crank. The first connecting member passes through the bearing and the first washer in sequence and is inserted into the first through hole. The first fastener is sleeved on the end of the first connecting member to fix the bearing on the second crank.

[0015] A second washer is provided on the end surface of the second crank away from the tooth lifting shaft, the second connecting piece passes through the second washer and is penetrated into the second through hole, and the second connecting piece is connected to the tooth lifting shaft to fix the second crank on the tooth lifting shaft.

[0016] In a possible implementation, both side end surfaces of the first crank are respectively provided with mounting holes and connecting columns, and the tooth lifting shaft is inserted into the mounting holes to be connected to the first crank;

[0017] The connecting post is located in the sliding groove and slides relative to the sliding groove.

[0018] In a possible implementation, the device further includes a first slider and a first retaining ring, wherein the first slider and the first retaining ring are sequentially sleeved on the connecting column;

[0019] The first sliding block is located in the sliding groove, and the first crank slides relative to the sliding groove through the first sliding block.

[0020] On the other hand, the present application further provides a sewing machine, comprising a frame and a sewing machine spindle, wherein the sewing machine spindle is located in the frame, and further comprising the sewing machine tooth lifting structure as described in any one of the above items;

[0021] The frame is provided with a support assembly to fix the sewing machine tooth lifting structure on the frame;

[0022] The tooth frame is provided with a second sliding block which can slide along the length direction of the tooth frame, and the second sliding block is sleeved on the main shaft of the sewing machine.

[0023] In a possible implementation, the support assembly includes a shaft sleeve and a tooth holder guide plate, and the tooth lifting shaft is inserted into the shaft sleeve;

[0024] The tooth frame guide plate is located below the tooth frame, and a slot matching the width of the tooth frame is provided on the tooth frame guide plate, and the tooth frame is engaged with the slot.

[0025] In a possible implementation, it further includes a sealing ring and a second retaining ring, wherein the sealing ring is disposed in the shaft sleeve;

[0026] The second retaining ring is installed on the tooth lifting shaft and is located between the tooth lifting shaft and the first crank, and the tooth lifting shaft is connected to the first crank through the second retaining ring.

[0027] In a possible implementation, a return torsion spring is sleeved on an outer wall of the shaft sleeve, and two ends of the return torsion spring are respectively in contact with the frame and the first transmission mechanism.

[0028] The present application provides a sewing machine tooth lifting structure and a sewing machine thereof, comprising a driving motor, a tooth lifting shaft, a first transmission mechanism and a tooth frame, wherein a first crank is mounted on the tooth lifting shaft and a feed tooth assembly is provided on the tooth frame.

[0029] When faced with sewing materials of different thicknesses and the height of the feed dog assembly needs to be adjusted, the drive motor is operated to drive the first transmission mechanism, thereby driving the tooth-lifting shaft together with the first crank installed on the tooth-lifting shaft to rotate around its own axis; at the same time, since part of the first crank is placed in the slide groove opened by the tooth frame, the first crank can also slide back and forth relative to the slide groove and push the tooth frame when rotating with the tooth-lifting shaft, so that it swings back and forth in the vertical direction; after the feed dog assembly on the tooth frame is corrected to the appropriate position, the drive motor is turned off to realize the lifting and lowering operation of the feed dog assembly.

[0030] Compared with the adjustment method of the feed dog assembly in the prior art, the sewing machine tooth lifting structure provided in the present application can accurately control the height of the feed dog assembly during the automatic adjustment process, thereby improving the adjustment efficiency of the feed dog assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to illustrate and explain the present application, and the present application is not limited to the specific implementation methods described below.

[0032] Figure 1 A schematic structural diagram of a sewing machine tooth lifting structure provided in an embodiment of the present application;

[0033] Figure 2 for Figure 1 Schematic diagram of the explosion structure;

[0034] Figure 3 A schematic structural diagram of a sewing machine provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 100- driving motor;

[0037] 200-tooth lifting axis;

[0038] 210-first crank;

[0039] 211-mounting hole; 212-connecting column;

[0040] 300-first transmission mechanism;

[0041] 310-cam;

[0042] 320 - second crank;

[0043] 321-first through hole; 322-second through hole;

[0044] 330-bearing;

[0045] 340-connection components;

[0046] 341-first connecting member; 342-first fastening member;

[0047] 350- second connecting piece;

[0048] 360-first gasket;

[0049] 370-second gasket;

[0050] 400- dental frame;

[0051] 410-feed dog assembly; 420-chute;

[0052] 500-first slider;

[0053] 600-first retaining ring;

[0054] 700-support assembly;

[0055] 710-sleeve;

[0056] 711-seal ring; 712-reset torsion spring;

[0057] 720-tooth frame guide;

[0058] 721-Card slot;

[0059] 800-second slider;

[0060] 900-Second retaining ring.

[0061] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0062] To make the purpose, technical solutions, and advantages of this application more clear, the following will use specific embodiments and the accompanying drawings to clearly and completely describe the technical solutions in this application and how the technical solutions in this application solve the above-mentioned technical problems. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0064] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0065] The terms "first," "second," "third," "fourth," and so on (if any) in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can be implemented in orders other than those illustrated or described herein.

[0066] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0067] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0068] As mentioned in the background technology, a sewing machine is a machine that uses one or more sewing threads to form one or more tracks on the sewing material, so that one or more layers of sewing material are interwoven or sewn together. In order to meet the sewing needs of sewing materials of different thicknesses, the height of the feed dog of the sewing machine needs to be appropriately adjusted. In the related art, the staff determines the height of the feed dog according to the thickness of the sewing material. If the current feed dog height is too high or too low, it is necessary to loosen the fixing screw of the feed dog. After the feed dog is corrected to the correct position, the fixing screw is tightened again. However, the above steps are all completed manually, making the height of the feed dog difficult to control.

[0069] Based on this, the present application provides a sewing machine tooth lifting structure and a sewing machine thereof, comprising a driving motor, a tooth lifting shaft, a first transmission mechanism and a tooth frame, wherein a first crank is installed on the tooth lifting shaft and a feed tooth assembly is provided on the tooth frame.

[0070] When faced with sewing materials of different thicknesses and the height of the feed dog assembly needs to be adjusted, the drive motor is operated to drive the first transmission mechanism, thereby driving the tooth-lifting shaft together with the first crank installed on the tooth-lifting shaft to rotate around its own axis; at the same time, since part of the first crank is placed in the slide groove opened by the tooth frame, the first crank can also slide back and forth relative to the slide groove and push the tooth frame when rotating with the tooth-lifting shaft, so that it swings back and forth in the vertical direction; after the feed dog assembly on the tooth frame is corrected to the appropriate position, the drive motor is turned off to realize the lifting and lowering operation of the feed dog assembly.

[0071] Compared with the adjustment method of the feed dog assembly in the prior art, the sewing machine tooth lifting structure provided in the present application can accurately control the height of the feed dog assembly during the adjustment process, thereby improving the adjustment efficiency of the feed dog assembly.

[0072] The following detailed description of the technical solution of the present application is provided with reference to the accompanying drawings. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0073] Reference Figures 1 to 2As shown, an embodiment of the present application provides a sewing machine tooth lifting structure, including a driving motor 100, a tooth lifting shaft 200, a first transmission mechanism 300 and a tooth frame 400; the driving motor 100 is connected to the tooth lifting shaft 200 through the first transmission mechanism 300 to drive the tooth lifting shaft 200 to rotate around its own axis; a first crank 210 is installed on the tooth lifting shaft 200, and a feed tooth assembly 410 is provided on the tooth frame 400, and the tooth frame 400 has a slide groove 420 extending along the length direction of the tooth frame 400, and part of the first crank 210 is located in the slide groove 420 and can slide relative to the slide groove 420 to drive the feed tooth assembly 410 to rise and fall.

[0074] In an embodiment of the present application, when facing sewing materials of different thicknesses and the height of the feed tooth assembly 410 needs to be adjusted, the drive motor 100 is operated to drive the first transmission mechanism 300, thereby driving the tooth lifting shaft 200 together with the first crank 210 installed on the tooth lifting shaft 200 to rotate around its own axis; at the same time, since part of the first crank 210 is placed in the slide groove 420 opened by the tooth frame 400, the first crank 210 can also slide back and forth relative to the slide groove 420 and push the tooth frame 400 when following the rotation of the tooth lifting shaft 200, so that it swings back and forth in the vertical direction; after the feed tooth assembly 410 on the tooth frame 400 is corrected to the appropriate position, the drive motor 100 is turned off to realize the lifting and lowering operation of the feed tooth assembly 410.

[0075] Compared with the adjustment method of the feed dog assembly 410 in the prior art, the sewing machine tooth lifting structure provided in the present application can accurately control the height of the feed dog assembly 410 during the adjustment process, thereby improving the adjustment efficiency of the feed dog assembly 410.

[0076] refer to Figure 2 As shown, in some embodiments, the first transmission mechanism 300 includes a cam 310 and a second crank 320, and the cam 310 is mounted on the output shaft of the drive motor 100; the first end of the second crank 320 is in contact with the cam 310, and the second end of the second crank 320 is connected to the tooth lifting shaft 200 to drive the tooth lifting shaft 200 to swing back and forth around its own axis.

[0077] It is understandable that, in the present application, there is no limitation on the specific structure of the first transmission mechanism 300, as long as it can transmit the kinetic energy of the drive motor 100 and drive the tooth-lifting shaft 200 to rotate around its own axis. Specifically, in the above embodiment, the cam 310 and the second crank 320 are used as a bridge to transmit the kinetic energy of the drive motor 100, which not only facilitates the assembly between the drive motor 100 and the tooth-lifting shaft 200, but also enables reliable transmission between the drive motor 100 and the tooth-lifting shaft 200.

[0078] In the specific implementation, due to the setting of the cam 310, the movement of the tooth lifting shaft 200 is not a simple circular rotation, but a back and forth swing within a certain circumferential range, thereby limiting the rotation range of the first crank 210 and preventing the first crank 210 from sliding out of the slide groove 420; at the same time, it can also limit the lifting range of the feed dog assembly 410 to avoid the feed dog assembly 410 from being damaged due to a rigid collision with the frame of the sewing machine due to the lifting range of the feed dog assembly 410 being too large.

[0079] Furthermore, in some embodiments, the first transmission mechanism 300 further includes a bearing 330 , which is mounted on a first end of the second crank 320 , and the second crank 320 abuts against the cam 310 via the bearing 330 .

[0080] Because the cam 310 and the second crank 320 slide relative to each other during operation of the sewing machine's feed dog mechanism, the contact surface between the cam 310 and the second crank 320 is prone to wear over time, reducing the lifting range of the feed dog assembly 410. Therefore, in the above embodiment, a bearing 330 is provided to convert the sliding friction between the cam 310 and the second crank 320 into rolling friction between the cam 310 and the bearing 330. This extends the service life of the cam 310 and the second crank 320 while ensuring that the feed dog assembly 410 can be raised and lowered normally.

[0081] Furthermore, in some embodiments, the first transmission mechanism 300 also includes a connecting component 340 and a second connecting component 350, and the first end and the second end of the second crank 320 are respectively provided with a first through hole 321 and a second through hole 322; the connecting component 340 includes a first connecting component 341 and a first fastener 342, and a first washer 360 is arranged between the bearing 330 and the second crank 320, the first connecting component 341 passes through the bearing 330 and the first washer 360 in sequence and is passed through the first through hole 321, and the first fastener 342 is sleeved on the end of the first connecting component 341 to fix the bearing 330 on the second crank 320; a second washer 370 is provided on the end face of the second crank 320 away from the tooth lifting shaft 200, the second connecting component 350 passes through the second washer 370 and is passed through the second through hole 322, and the second connecting component 350 is connected to the tooth lifting shaft 200 to fix the second crank 320 on the tooth lifting shaft 200.

[0082] It is understandable that, in the present application, there is no restriction on the specific connection method between the bearing 330 and the second crank 320, and between the second crank 320 and the tooth-lifting shaft 200, as long as it is ensured that the bearing 330 can be fixed on the second crank 320 and the second crank 320 can be fixed on the tooth-lifting shaft 200. Specifically, in the above embodiment, the connection method between the bearing 330 and the second crank 320, and between the second crank 320 and the tooth-lifting shaft 200 are all set to be detachable. Compared with welding and other methods, when the bearing 330 or the second crank 320 is damaged, it is convenient for the staff to repair or replace it.

[0083] At the same time, washers are provided between the bearing 330 and the second crank 320 and between the second connecting member 350 and the second crank 320 to reduce wear caused by relative sliding of the various components during the assembly process.

[0084] refer to Figure 2 As shown, in some embodiments, mounting holes 211 and connecting columns 212 are respectively provided on both side end surfaces of the first crank 210, and the tooth lifting shaft 200 is inserted into the mounting hole 211 to be connected to the first crank 210; the connecting column 212 is located in the slide groove 420 and slides relative to the slide groove 420.

[0085] Mounting holes 211 and connecting columns 212 are provided on both sides of the first crank 210 to be assembled with the tooth lifting shaft 200 and the slide groove 420 respectively, so that reliable transmission can be formed between the tooth lifting shaft 200, the first crank 210 and the tooth frame 400.

[0086] Furthermore, in some embodiments, a first slider 500 and a first retaining ring 600 are also included, and the first slider 500 and the first retaining ring 600 are sequentially mounted on the connecting column 212; the first slider 500 is located in the slide groove 420, and the first crank 210 slides relative to the slide groove 420 through the first slider 500.

[0087] In the above embodiment, a first slider 500 is provided to increase the contact area between the first crank 210 and the slide groove 420, which not only reduces the pressure per unit area on the contact surface, but also enables reliable transmission between the first crank 210 and the slide groove 420; and a first retaining ring 600 is provided to limit the first slider 500 to prevent the first slider 500 from falling off the connecting column 212.

[0088] An embodiment of the present application also provides a sewing machine, comprising a frame and a sewing machine main shaft, wherein the sewing machine main shaft is located inside the frame.

[0089] Reference Figures 1 to 3As shown, the sewing machine also includes a sewing machine tooth lifting structure; a support assembly 700 is provided on the frame to fix the sewing machine tooth lifting structure on the frame; a second slider 800 that can slide along the length direction of the tooth frame 400 is provided on the tooth frame 400, and the second slider 800 is mounted on the sewing machine main shaft.

[0090] Among them, the sewing machine tooth lifting structure in the embodiment of the present application has the same structure as the sewing machine tooth lifting structure provided in any of the above embodiments, and can bring the same or similar technical effects. They will not be described one by one here, and please refer to the description of the above embodiments for details.

[0091] Here, the second slider 800 is used as a bridge to install the tooth frame 400 on the sewing machine main shaft. In the specific implementation, the tooth frame 400 uses the sewing machine main shaft as a fulcrum. When the tooth lifting shaft 200 and the first crank 210 swing downward, the feed dog assembly 410 rises; when the tooth lifting shaft 200 and the first crank 210 swing upward, the feed dog assembly 410 descends.

[0092] Furthermore, in some embodiments, the support assembly 700 includes a sleeve 710 and a tooth frame guide plate 720, and the tooth lifting shaft 200 is passed through the sleeve 710; the tooth frame guide plate 720 is located below the tooth frame 400, and a slot 721 matching the width of the tooth frame 400 is provided on the tooth frame guide plate 720, and the tooth frame 400 is engaged with the slot 721.

[0093] Since the tooth-lifting shaft 200 needs to swing back and forth within a certain circumferential range during the operation of the sewing machine's tooth-lifting mechanism, if the tooth-lifting shaft 200 is directly sleeved on the frame, the rotation of the tooth-lifting shaft 200 will not be smooth. Therefore, in the above embodiment, a shaft sleeve 710 is provided. In a specific implementation, lubricating oil is applied to the shaft sleeve 710 to reduce the friction force on the tooth-lifting shaft 200 during rotation, thereby improving the adjustment efficiency of the feed dog assembly 410.

[0094] The tooth rack guide plate 720 is provided to limit the tooth rack 400 in the horizontal direction to prevent the tooth rack 400 from swinging left and right while moving up and down, thereby affecting the control of the position of the feed dog assembly 410 by the staff.

[0095] Furthermore, in some embodiments, a sealing ring 711 and a second retaining ring 900 are also included, and the sealing ring 711 is arranged in the sleeve 710; the second retaining ring 900 is installed on the tooth lifting shaft 200 and is located between the tooth lifting shaft 200 and the first crank 210, and the tooth lifting shaft 200 is connected to the first crank 210 through the second retaining ring 900.

[0096] In order to prevent the lubricating oil in the sleeve 710 from flowing out, affecting the rotation of the tooth-lifting shaft 200 and contaminating other internal components of the sewing machine, in the above embodiment, the sealing ring 711 is used as the primary sealing structure and the second retaining ring 900 is used as the secondary sealing structure to achieve multi-stage sealing of the sleeve 710.

[0097] refer to Figure 1 and Figure 2 As shown, in some embodiments, a return torsion spring 712 is sleeved on the outer wall of the shaft sleeve 710 , and two ends of the return torsion spring 712 are respectively in contact with the frame and the first transmission mechanism 300 .

[0098] In a specific implementation, both ends of the return torsion spring 712 abut against the frame and the second crank 320 respectively to ensure that the bearing 330 provided on the second crank 320 always maintains contact with the cam 310 to achieve the transmission of kinetic energy of the drive motor 100.

[0099] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the principles of this application shall be included within the scope of protection of this application.

Claims

1. A sewing machine tooth lifting structure, characterized in that: It comprises a driving motor (100), a tooth lifting shaft (200), a first transmission mechanism (300) and a tooth frame (400); The driving motor (100) is connected to the tooth-lifting shaft (200) via the first transmission mechanism (300) to drive the tooth-lifting shaft (200) to rotate around its own axis; A first crank (210) is installed on the tooth lifting shaft (200), a feed tooth assembly (410) is provided on the tooth frame (400), and the tooth frame (400) has a slide groove (420) extending along the length direction of the tooth frame (400). Part of the first crank (210) is located in the slide groove (420) and can slide relative to the slide groove (420) to drive the feed tooth assembly (410) to rise and fall.

2. The sewing machine tooth lifting structure according to claim 1, characterized in that: The first transmission mechanism (300) comprises a cam (310) and a second crank (320), wherein the cam (310) is sleeved on the output shaft of the drive motor (100); The first end of the second crank (320) abuts against the cam (310), and the second end of the second crank (320) is connected to the tooth lifting shaft (200) to drive the tooth lifting shaft (200) to swing back and forth around its own axis.

3. The sewing machine tooth lifting structure according to claim 2, characterized in that: The first transmission mechanism (300) further includes a bearing (330), wherein the bearing (330) is mounted on a first end of the second crank (320), and the second crank (320) abuts against the cam (310) via the bearing (330).

4. The sewing machine tooth lifting structure according to claim 3, characterized in that: The first transmission mechanism (300) further comprises a connecting assembly (340) and a second connecting member (350); the first end and the second end of the second crank (320) are respectively provided with a first through hole (321) and a second through hole (322); The connecting assembly (340) includes a first connecting member (341) and a first fastening member (342); a first washer (360) is provided between the bearing (330) and the second crank (320); the first connecting member (341) passes through the bearing (330) and the first washer (360) in sequence and is provided in the first through hole (321); the first fastening member (342) is sleeved on the end of the first connecting member (341) to fix the bearing (330) on the second crank (320); A second washer (370) is provided on the end surface of the second crank (320) away from the tooth-lifting shaft (200), the second connecting member (350) passes through the second washer (370) and is penetrated into the second through hole (322), and the second connecting member (350) is connected to the tooth-lifting shaft (200) to fix the second crank (320) on the tooth-lifting shaft (200).

5. The sewing machine tooth lifting structure according to claim 1, characterized in that: The end surfaces of both sides of the first crank (210) are respectively provided with mounting holes (211) and connecting columns (212), and the tooth lifting shaft (200) is inserted into the mounting holes (211) to be connected to the first crank (210); The connecting column (212) is located in the sliding groove (420) and slides relative to the sliding groove (420).

6. The sewing machine tooth lifting structure according to claim 5, characterized in that: It also includes a first slider (500) and a first retaining ring (600), wherein the first slider (500) and the first retaining ring (600) are sequentially sleeved on the connecting column (212); The first slider (500) is located in the slide groove (420), and the first crank (210) slides relative to the slide groove (420) through the first slider (500).

7. A sewing machine comprising a frame and a sewing machine spindle, wherein the sewing machine spindle is located inside the frame, characterized in that: Also includes the sewing machine tooth lifting structure according to any one of claims 1 to 6; A support assembly (700) is provided on the frame to fix the sewing machine tooth lifting structure on the frame; The tooth frame (400) is provided with a second slider (800) capable of sliding along the length direction of the tooth frame (400), and the second slider (800) is sleeved on the main shaft of the sewing machine.

8. The sewing machine according to claim 7, characterized in that The support assembly (700) includes a shaft sleeve (710) and a tooth frame guide plate (720), and the tooth lifting shaft (200) is inserted into the shaft sleeve (710); The tooth frame guide plate (720) is located below the tooth frame (400), and a slot (721) matching the width of the tooth frame (400) is provided on the tooth frame guide plate (720), and the tooth frame (400) is engaged with the slot (721).

9. The sewing machine according to claim 8, characterized in that It also includes a sealing ring (711) and a second retaining ring (900), wherein the sealing ring (711) is disposed in the shaft sleeve (710); The second retaining ring (900) is mounted on the tooth-lifting shaft (200) and is located between the tooth-lifting shaft (200) and the first crank (210); the tooth-lifting shaft (200) is connected to the first crank (210) via the second retaining ring (900).

10. The sewing machine according to claim 8, characterized in that A return torsion spring (712) is sleeved on the outer wall of the shaft sleeve (710), and two ends of the return torsion spring (712) are respectively in contact with the frame and the first transmission mechanism (300).

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