stitcher

Abstract

The utility model relates to the field of clothing processing especially is concerned about a binding machine. Binding machine includes the casing, drive assembly and cloth feeding subassembly, drive assembly is connected with the casing, cloth feeding subassembly is connected with drive assembly, and can reciprocate in response to the drive of drive assembly, cloth feeding subassembly includes first tooth frame, first tooth lifting block and second tooth lifting block, and the both ends of first tooth frame are provided with first recess and second recess, and the first tooth frame is internally structured with the accommodating cavity, and the both ends of accommodating cavity are structured with the through -hole communication with first recess and second recess, first tooth lifting block is movably connected in first recess, second tooth lifting block is movably connected in second recess, and accommodating cavity is used for accommodating lubricating medium. Its advantage lies in, the accommodating cavity of first tooth frame can accommodate lubricating medium, and lubricating medium can flow to first recess and second recess through the through -hole, thereby providing the lubrication effect to the movement of first tooth lifting block and second tooth lifting block.

Description

Technical Field

[0001] This utility model relates to the field of garment processing, and in particular to a cover-sewing machine. Background Technology

[0002] The coverstitch machine includes a fabric feeding assembly and a drive assembly. The drive assembly is connected to the fabric feeding assembly and can drive the fabric feeding assembly to reciprocate. The operation of the drive assembly and the fabric feeding assembly requires lubrication to reduce friction and make the coverstitch machine work more smoothly.

[0003] Currently, the lubrication of the drive components is usually achieved through lubricating oil. During the operation of the coverstitch machine, the lubricating oil is delivered to the head through the central through-hole of the main shaft differential shaft in the drive component, and then reaches the drive component and related structures of the fabric feeding component through oil lines, oil cotton, or splashing, thus completing the lubrication action. However, most coverstitch machines have an open structure for the fabric feeding component, which is directly connected to the outside. Therefore, there is a possibility that the lubricating oil will be thrown out during the sewing process, contacting and contaminating the fabric. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a cover stitch machine.

[0005] A coverstitch sewing machine includes: a housing; a drive assembly connected to the housing; and a feed assembly connected to the drive assembly and capable of reciprocating in response to the drive assembly. The feed assembly includes a first feed dog, a first lifting block, and a second lifting block. The first feed dog has a first groove and a second groove at both ends. A receiving cavity is formed within the first feed dog. Through holes communicating with the first groove and the second groove are formed at both ends of the receiving cavity. The first lifting block is movably connected to the first groove, and the second lifting block is movably connected to the second groove. The receiving cavity is used to contain a lubricating medium.

[0006] With this configuration, the drive assembly provides the power source, and the feeding assembly completes the feeding operation through reciprocating motion. The receiving cavity of the first tooth frame can accommodate the lubricating medium, and the lubricating medium can flow through the through hole to the first groove and the second groove, thereby providing lubrication for the movement of the first tooth lifting block and the second tooth lifting block.

[0007] In one embodiment, a first grease groove is formed on the outer peripheral side of the first lifting block, and the first grease groove cooperates with the first groove to form a space for accommodating lubricating medium; and / or

[0008] The second tooth-lifting block has a second grease groove on its outer peripheral side, and the second grease groove cooperates with the second groove to form a space for accommodating the lubricating medium.

[0009] In one embodiment, the feeding assembly further includes a second toothed bracket, with a third groove and a fourth groove at both ends. The third groove cooperates with the first groove to accommodate the first toothed block, and the fourth groove cooperates with the second groove to accommodate the second toothed block.

[0010] In one embodiment, the first dental arch has an opening on its side facing the second dental arch, the opening being in communication with the receiving cavity, and the second dental arch covers the opening on its side facing the first dental arch.

[0011] In one embodiment, the drive assembly includes a main shaft and a first driven shaft. The main shaft is drively connected to the first driven shaft. The main shaft is connected to the first tooth-lifting block and is capable of driving the first tooth-lifting block to reciprocate along the first groove. The first driven shaft is connected to the second tooth-lifting block and is capable of driving the second tooth-lifting block to reciprocate along the second groove.

[0012] In one embodiment, the spindle includes a first main section and an eccentric section, the eccentric section being connected to the first main section, and the axis of the eccentric section being eccentrically disposed from the axis of the first main section;

[0013] The first driven shaft includes a second main section, a rotating section and a connecting section connected in sequence, with the axis of the second main section and the axis of the connecting section being eccentrically set.

[0014] In one embodiment, the first lifting block has a first rotating hole, and a ball bearing is embedded in the first rotating hole. The main shaft is connected to the inner wall of the ball bearing.

[0015] In one embodiment, the drive assembly further includes a second driven shaft and a third driven shaft, both of which are drively connected to the main shaft. One end of the second driven shaft is connected to a first connecting rod assembly, which is connected to the first gear frame. One end of the second driven shaft is connected to a second connecting rod assembly, which is connected to the second gear frame.

[0016] In one embodiment, the first linkage assembly includes a driven block and a first link, the driven block being connected to a second driven shaft and the driven block being connected to the first link, one end of the first link away from the driven block being connected to the first gear frame, the second linkage assembly including a crank and a second link, the crank being connected to the third driven shaft and the crank being rotatably connected to the second link, and the second link being connected to the second gear frame.

[0017] In one embodiment, the first connecting rod is connected to a first rotating shaft and a second rotating shaft at its two ends, respectively. The driven block is provided with a driven groove, the first rotating shaft is movably limited in the driven groove, and the second rotating shaft is connected to the first tooth frame.

[0018] The second connecting rod is connected to a third shaft and a fourth shaft at its two ends, respectively. The third shaft is rotatably connected to the crank, and the fourth shaft is connected to the second gear frame.

[0019] In one embodiment, the first connecting rod has a first rotating groove, a second rotating groove, and a first communicating cavity. The first rotating shaft is rotatably connected to the first rotating groove, the second rotating shaft is rotatably connected to the second rotating groove, and the first communicating cavity communicates the first rotating groove and the second rotating groove.

[0020] The second connecting rod has a third rotating groove, a fourth rotating groove, and a second communicating cavity. The third rotating shaft is rotatably connected to the third rotating groove, the fourth rotating shaft is rotatably connected to the fourth rotating groove, and the second communicating cavity connects the third rotating groove and the fourth rotating groove.

[0021] In one embodiment, the feeding assembly includes a first feeding tooth and a second feeding tooth, with the second feeding tooth connected to the first feeding tooth holder, and the first feeding tooth and the second feeding tooth respectively connected to the first feeding tooth holder and the second feeding tooth holder.

[0022] In one embodiment, the cover stitch machine further includes a needle guard assembly, which includes a needle guard and a bushing. The bushing is connected to the machine housing. The needle guard includes a frame and a connecting shaft. The frame and the connecting shaft are connected. The connecting shaft is rotatably connected to the bushing. The outer periphery of the connecting shaft is provided with a receiving groove, which is configured as a spiral structure.

[0023] Compared to existing technologies, this invention features a receiving cavity and a through hole in the first tooth frame. The receiving cavity can hold a lubricating medium, and the lubricating medium can flow through the through hole to the first and second grooves, thereby providing lubrication for the movement of the first and second tooth lifting blocks. Furthermore, chambers for storing the lubricating medium are formed in the first and second connecting rods used to drive the movement of the first and second tooth frames, and an oil storage groove is constructed in the first needle holder assembly. Attached Figure Description

[0024] Figure 1 A schematic diagram of one embodiment of the overlock sewing machine provided by this utility model;

[0025] Figure 2 A partial structural schematic diagram of one embodiment of the overlock sewing machine provided by this utility model;

[0026] Figure 3 A partial structural schematic diagram from another angle of one embodiment of the overlock sewing machine provided by this utility model;

[0027] Figure 4 A side view of one embodiment of the overlock sewing machine provided by this utility model;

[0028] Figure 5 A partial structural schematic diagram of one embodiment of the fabric feeding assembly provided by this utility model;

[0029] Figure 6 A partial structural schematic diagram of one embodiment of the fabric feeding assembly provided by this utility model;

[0030] Figure 7 A schematic diagram of the structure of one embodiment of the first link and the second link provided by this utility model;

[0031] Figure 8 A schematic diagram of one embodiment of the spindle and the first tooth-lifting block provided by this utility model;

[0032] Figure 9 A schematic diagram of one embodiment of the needle protector assembly provided by this utility model;

[0033] Figure 10 A schematic diagram of one embodiment of the second driven shaft provided by this utility model;

[0034] Figure 11 A schematic diagram of one embodiment of the spindle provided by this utility model.

[0035] The symbols in the diagram represent the following meanings:

[0036] 100. Overlock sewing machine; 10. Machine housing; 20. Drive assembly; 21. Main shaft; 211. First main section; 212. Eccentric section; 22. First driven shaft; 221. Second main section; 222. Rotating section; 223. Connecting section; 23. Second driven shaft; 24. Third driven shaft; 25. First connecting rod assembly; 251. Driven block; 2511. Driven groove; 252. First connecting rod; 2521. First rotating groove; 2522. Second rotating groove; 2523. First communicating cavity; 26. Second connecting rod assembly; 261. Crank; 262. Second connecting rod; 2621. Third rotating groove; 2622. Fourth rotating groove 2623, second connecting cavity; 263, first rotating shaft; 264, second rotating shaft; 265, third rotating shaft; 266, fourth rotating shaft; 30, feed assembly; 31, first tooth holder; 311, first groove; 312, second groove; 313, receiving cavity; 314, through hole; 315, opening; 32, second tooth holder; 33, first lifting tooth block; 331, first grease groove; 332, first rotating hole; 333, ball bearing; 34, second lifting tooth block; 341, second grease groove; 35, first feed tooth; 36, second feed tooth; 40, needle guard assembly; 41, needle guard; 411, receiving groove. Detailed Implementation

[0037] 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.

[0038] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Please see Figures 1-11 This utility model provides a cover-sewing machine 100, whose fabric feeding component 30 is self-lubricating, eliminating the need to spray lubricating oil through external nozzles to lubricate various structures and avoiding lubricating oil from getting on the fabric.

[0043] The coverstitch sewing machine 100 includes a housing 10, a drive assembly 20, and a feed assembly 30. The drive assembly 20 is connected to the housing 10, and the feed assembly 30 is connected to the drive assembly 20 and can reciprocate in response to the drive of the drive assembly 20. The feed assembly 30 includes a first feed dog 31, a first lifting block 33, and a second lifting block 34. The first feed dog 31 has a first groove 311 and a second groove 312 at both ends. The first feed dog 31 has a receiving cavity 313, and the receiving cavity 313 has through holes 314 at both ends that communicate with the first groove 311 and the second groove 312, respectively. The first lifting block 33 is movably connected to the first groove 311, and the second lifting block 34 is movably connected to the second groove 312. The receiving cavity 313 is used to contain a lubricating medium. Thus, the drive assembly 20 provides a power source, and the feed assembly 30 completes the feed operation through reciprocating motion. The receiving cavity 313 of the first tooth frame 31 can contain the lubricating medium, and the lubricating medium can flow through the through hole 314 to the first groove 311 and the second groove 312, thereby providing lubrication for the movement of the first tooth lifting block 33 and the second tooth lifting block 34.

[0044] To guide the movement of the lubricating medium and prevent it from overflowing, a first grease groove 331 is formed on the outer periphery of the first lifting block 33. The first grease groove 331 cooperates with the first groove 311 to form a space for containing the lubricating medium; and / or, a second grease groove 341 is formed on the outer periphery of the second lifting block 34. The second grease groove 341 cooperates with the second groove 312 to form a space for containing the lubricating medium. Thus, the first grease groove 331 and the second grease groove 341 are used to contain the lubricating medium, storing a certain amount of lubricating medium for use during the long-term high-frequency reciprocating motion of the first lifting block 33 and the second lifting block 34.

[0045] Furthermore, the feeding assembly 30 also includes a second toothed bracket 32. The second toothed bracket 32 ​​has a third groove and a fourth groove at both ends. The third groove cooperates with the first groove 311 to accommodate the first lifting tooth block 33, and the fourth groove and the second groove 312 cooperate to accommodate the second lifting tooth block 34. Thus, the third groove and the first groove 311 overlap along the thickness direction, forming a thicker groove that provides a larger contact area with the first lifting tooth block 33, resulting in more stable movement of the first lifting tooth block 33. Similarly, the cooperation of the second groove 312 and the fourth groove further stabilizes the movement of the second lifting tooth block 34.

[0046] To facilitate the addition of lubricating medium during assembly, the first tooth holder 31 has an opening 315 on its side facing the second tooth holder 32. The opening 315 communicates with the receiving cavity 313, and the side of the second tooth holder 32 facing the first tooth holder 31 covers the opening 315. Thus, during assembly, lubricating medium can be added to the receiving cavity 313 of the first tooth holder 31 through the opening 315, and then the second tooth holder 32 can be placed over the side of the first tooth holder 31 with the opening 315 to seal the receiving cavity 313.

[0047] The drive assembly 20 includes a main shaft 21 and a first driven shaft 22. The main shaft 21 is driveably connected to the first driven shaft 22 and is connected to a first tooth-lifting block 33, enabling the main shaft 21 to drive the first tooth-lifting block 33 to reciprocate along the first groove 311. The first driven shaft 22 is connected to a second tooth-lifting block 34 and is capable of driving the second tooth-lifting block 34 to reciprocate along the second groove 312. Thus, the main shaft 21 synchronously drives the first driven shaft 22 through its drive connection with the first driven shaft 22, thereby driving the first tooth-lifting block 33 and the second tooth-lifting block 34 to move in coordination.

[0048] Specifically, there are multiple ways to achieve reciprocating motion. In this embodiment, the main shaft 21 includes a first main section 211 and an eccentric section 212. The eccentric section 212 is connected to the first main section 211, and the axis of the eccentric section 212 is eccentrically set to the axis of the first main section 211. The first driven shaft 22 includes a second main section 221, a rotating section 222, and a connecting section 223 connected in sequence. The axis of the second main section 221 is eccentrically set to the axis of the connecting section 223. Thus, because the eccentric section 212 and the first main section 211 are eccentrically set, when the first main section 211 rotates around its own axis, the eccentric section 212 will rotate around the axis of the first main section 211 in a circular trajectory, thereby driving the first lifting block 33 to reciprocate. The axes of the second main section 221 and the connecting section 223 of the first driven shaft 22 are eccentrically set. Similarly, the connecting section 223 can rotate around the axis of the second main section 221 to drive the second tooth lifting block 34 to reciprocate.

[0049] Furthermore, in this embodiment, the first driven shaft 22 is configured to rotate back and forth within a certain angle range, thereby driving the connecting section 223 to rotate within a certain angle range through the rotating section 222, which can also achieve the driving of the second tooth lifting block 34.

[0050] The first lifting block 33 has a first rotating hole 332, and a ball bearing 333 is embedded in the first rotating hole 332. The main shaft 21 is connected to the inner wall of the ball bearing 333. In this way, by using the ball bearing 333, which has a self-lubricating effect, there is no need to spray lubricating medium between the first rotating hole 332 and the main shaft 21, thereby reducing the risk of lubricating medium leakage.

[0051] The drive assembly 20 also includes a second driven shaft 23 and a third driven shaft 24, both of which are connected to the main shaft 21. One end of the second driven shaft 23 is connected to a first connecting rod assembly 25, which is connected to the first gear 31. The other end of the second driven shaft 23 is connected to a second connecting rod assembly 26, which is connected to the second gear 32. Thus, both the second driven shaft 23 and the third driven shaft 24 obtain driving force from the main shaft 21. The second driven shaft 23 drives the first gear 31 to move through the first connecting rod assembly 25, and the third driven shaft 24 drives the second gear 32 to move through the second connecting rod assembly 26.

[0052] Specifically, the first linkage assembly 25 includes a driven block 251 and a first connecting rod 252. The driven block 251 is connected to the second driven shaft 23, and the first connecting rod 252 is also connected to it. The end of the first connecting rod 252 away from the driven block 251 is connected to the first gear frame 31. The second linkage assembly 26 includes a crank 261 and a second connecting rod 262. The crank 261 is rotatably connected to the second connecting rod 262, and the second connecting rod 262 is connected to the second gear frame 32. Thus, the second driven shaft 23 drives the driven block 251 to move, the driven block 251 drives the first connecting rod 252 to move, the third driven shaft 24 drives the crank 261 to move, and the crank 261 drives the second connecting rod 262 to move. Through the transition between the two intermediate components, the driven block 251 and the crank 261, the direction of actuation can be changed, facilitating the reciprocating motion of the first gear frame 31 and the second gear frame 32.

[0053] The first connecting rod 252 is connected to a first rotating shaft 263 and a second rotating shaft 264 at its two ends, respectively. A driven block 251 has a driven groove 2511. The first rotating shaft 263 is movably limited within the driven groove 2511, and the second rotating shaft 264 is connected to the first gear frame 31. The second connecting rod 262 is connected to a third rotating shaft 265 and a fourth rotating shaft 266 at its two ends, respectively. The third rotating shaft 265 is rotatably connected to the crank 261, and the fourth rotating shaft 266 is connected to the second gear frame 32. Thus, when the driven block 251 moves with the first rotating shaft 263, the groove wall of the driven groove 2511 abuts against the first rotating shaft 263. The first rotating shaft 263 drives the first connecting rod 252, which in turn drives the second rotating shaft 264, which in turn drives the first gear frame 31 to reciprocate. At the same time, the rotation of crank 261 drives the third shaft 265, the third shaft 265 drives the second connecting rod 262 to move, and the second connecting rod 262 then drives the second gear frame 32 to move through the fourth shaft 266.

[0054] The first connecting rod 252 has a first rotating groove 2521, a second rotating groove 2522, and a first communicating cavity 2523. A first rotating shaft 263 is rotatably connected to the first rotating groove 2521, and a second rotating shaft 264 is rotatably connected to the second rotating groove 2522. The first communicating cavity 2523 connects the first rotating groove 2521 and the second rotating groove 2522. The second connecting rod 262 has a third rotating groove 2621, a fourth rotating groove 2622, and a second communicating cavity 2623. A third rotating shaft 265 is rotatably connected to the third rotating groove 2621, and a fourth rotating shaft 266 is rotatably connected to the fourth rotating groove 2622. The second communicating cavity 2623 connects the third rotating groove 2621 and the fourth rotating groove 2622. Thus, the first rotating groove 2521 and the second rotating groove 2522 are connected through the first connecting cavity 2523. During assembly, lubricating medium can be filled into any space in the first rotating groove 2521, the second rotating groove 2522, and the first connecting cavity 2523. During the movement of the first connecting rod 252, the lubricating medium can flow in the first rotating groove 2521, the second rotating groove 2522, and the first connecting cavity 2523 without the need for additional lubricating oil spraying. Similarly, the lubricating medium can flow between the third rotating groove 2621, the fourth rotating groove 2622, and the second connecting cavity 2623 without the need for additional lubricating oil spraying.

[0055] The fabric feeding assembly 30 includes a first feed dog 35 and a second feed dog 36, which are respectively connected to a first feed dog frame 31 and a second feed dog frame 32. The first feed dog 35 and the second feed dog 36 can stably feed fabric through reciprocating motion.

[0056] The coverstitch machine 100 also includes a needle guard assembly 40, which includes a needle guard 41 and a bushing. The bushing is connected to the machine housing 10. The needle guard 41 includes a frame and a connecting shaft. The frame and the connecting shaft are connected, and the connecting shaft is rotatably connected to the bushing. A receiving groove 411 is provided on the outer periphery of the connecting shaft. The receiving groove 411 is configured with a spiral structure. In this way, the receiving groove 411 can store a lubricating medium, thereby providing a medium for the high-frequency and long-term friction between the bushing and the needle guard 41.

[0057] In addition, the lubricating medium used in the application is lubricating paste or lubricating oil.

[0058] Compared to existing technologies, this invention provides lubrication by creating a receiving cavity 313 and a through hole 314 in the first tooth frame 31. The receiving cavity 313 can accommodate a lubricating medium, and the lubricating medium can flow through the through hole 314 to the first groove 311 and the second groove 312, thereby providing lubrication for the movement of the first tooth lifting block 33 and the second tooth lifting block 34. Furthermore, chambers for storing lubricating medium are created in the first connecting rod 252 and the second connecting rod 262 used to drive the movement of the first tooth frame 31 and the second tooth frame 32, and a receiving groove 411 for storing oil is constructed in the first needle holder assembly 40.

[0059] 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.

[0060] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A cover-stitching machine, characterized in that, include: Casing (10); The drive assembly (20) is connected to the housing (10); The fabric feeding assembly (30) is connected to the drive assembly (20) and is capable of reciprocating in response to the drive assembly (20); The feeding assembly (30) includes a first toothed bracket (31), a first toothed block (33), and a second toothed block (34). The first toothed bracket (31) has a first groove (311) and a second groove (312) at both ends. The first toothed bracket (31) has a receiving cavity (313). The receiving cavity (313) has through holes (314) at both ends that communicate with the first groove (311) and the second groove (312). The first toothed block (33) is movably connected to the first groove (311), and the second toothed block (34) is movably connected to the second groove (312). The receiving cavity (313) is used to contain the lubricating medium.

2. The overlock sewing machine according to claim 1, characterized in that, The outer periphery of the first lifting block (33) is provided with a first grease groove (331), which cooperates with the first groove (311) to form a space for accommodating the lubricating medium; and / or, The second lifting block (34) has a second grease groove (341) on its outer periphery. The second grease groove (341) and the second groove (312) cooperate to form a space for accommodating the lubricating medium.

3. The overlock sewing machine according to claim 1, characterized in that, The fabric feeding assembly (30) also includes a second toothed bracket (32), with a third groove and a fourth groove at both ends. The third groove cooperates with the first groove (311) to accommodate the first toothed block (33), and the fourth groove and the second groove (312) cooperate to accommodate the second toothed block (34).

4. The overlock sewing machine according to claim 3, characterized in that, The first dental arch (31) has an opening (315) on the side facing the second dental arch (32), the opening (315) is connected to the receiving cavity (313), and the side of the second dental arch (32) facing the first dental arch (31) covers the opening (315).

5. The overlock sewing machine according to claim 1, characterized in that, The drive assembly (20) includes a main shaft (21) and a first driven shaft (22). The main shaft (21) is connected to the first driven shaft (22) in a transmission connection. The main shaft (21) is connected to the first tooth lifting block (33) and can drive the first tooth lifting block (33) to reciprocate along the first groove (311). The first driven shaft (22) is connected to the second tooth lifting block (34) and can drive the second tooth lifting block (34) to reciprocate along the second groove (312).

6. The overlock sewing machine according to claim 5, characterized in that, The main shaft (21) includes a first main section (211) and an eccentric section (212). The eccentric section (212) is connected to the first main section (211), and the axis of the eccentric section (212) is eccentrically set to the axis of the first main section (211). The first driven shaft (22) includes a second main section (221), a rotating section (222) and a connecting section (223) connected in sequence, with the axis of the second main section (221) and the axis of the connecting section (223) being eccentrically set.

7. The overlock sewing machine according to claim 5, characterized in that, The first lifting block (33) has a first rotating hole (332), and a ball bearing (333) is embedded in the first rotating hole (332). The main shaft (21) is connected to the inner wall of the ball bearing (333).

8. The overlock sewing machine according to claim 5, characterized in that, The drive assembly (20) further includes a second driven shaft (23) and a third driven shaft (24). The second driven shaft (23) and the third driven shaft (24) are both connected to the main shaft (21). One end of the second driven shaft (23) is connected to a first connecting rod assembly (25). The first connecting rod assembly (25) is connected to the first tooth frame (31). One end of the second driven shaft (23) is connected to a second connecting rod assembly (26). The second connecting rod assembly (26) is connected to the second tooth frame (32).

9. The overlock sewing machine according to claim 8, characterized in that, The first linkage assembly (25) includes a driven block (251) and a first link (252). The driven block (251) is connected to the second driven shaft (23) and the driven block (251) is connected to the first link (252). The end of the first link (252) away from the driven block (251) is connected to the first gear (31). The second linkage assembly (26) includes a crank (261) and a second link (262). The crank (261) is connected to the third driven shaft (24) and the crank (261) is rotatably connected to the second link (262). The second link (262) is connected to the second gear (32).

10. The overlock sewing machine according to claim 9, characterized in that, The first connecting rod (252) is connected to a first rotating shaft (263) and a second rotating shaft (264) at both ends. The driven block (251) is provided with a driven groove (2511). The first rotating shaft (263) is movably limited in the driven groove (2511). The second rotating shaft (264) is connected to the first tooth frame (31). The second connecting rod (262) is connected to a third rotating shaft (265) and a fourth rotating shaft (266) at its two ends respectively. The third rotating shaft (265) is rotatably connected to the crank (261), and the fourth rotating shaft (266) is connected to the second gear frame (32).

11. The overlock sewing machine according to claim 10, characterized in that, The first connecting rod (252) has a first rotating groove (2521), a second rotating groove (2522) and a first communicating cavity (2523). The first rotating shaft (263) is rotatably connected to the first rotating groove (2521), the second rotating shaft (264) is rotatably connected to the second rotating groove (2522), and the first communicating cavity (2523) connects the first rotating groove (2521) and the second rotating groove (2522). The second connecting rod (262) has a third rotating groove (2621), a fourth rotating groove (2622), and a second communicating cavity (2623). The third rotating shaft (265) is rotatably connected to the third rotating groove (2621), and the fourth rotating shaft (266) is rotatably connected to the fourth rotating groove (2622). The second communicating cavity (2623) connects the third rotating groove (2621) and the fourth rotating groove (2622).

12. The overlock sewing machine according to claim 1, characterized in that, The feeding assembly (30) includes a first feeding tooth (35) and a second feeding tooth (36). The first tooth frame (31) is connected to the second tooth frame (32). The first feeding tooth (35) and the second feeding tooth (36) are respectively connected to the first tooth frame (31) and the second tooth frame (32).

13. The overlock sewing machine according to claim 1, characterized in that, The cover stitch machine also includes a needle guard assembly (40), which includes a needle guard (41) and a bushing. The bushing is connected to the machine housing (10). The needle guard (41) includes a frame and a connecting shaft. The frame and the connecting shaft are connected. The connecting shaft is rotatably connected to the bushing. The outer periphery of the connecting shaft is provided with a receiving groove (411), which is configured as a spiral structure.

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