A needle bar driving structure adapted to high speed

Abstract

A needle bar driving structure adapted to high speed includes a housing and a main shaft, and also includes a wheel shaft transmission assembly, a rotating block, a lever assembly, a guide column and a needle bar driving seat. The main shaft is connected to the wheel shaft transmission assembly in a transmission manner. The wheel shaft transmission assembly, the lever assembly and the guide column are all fixedly connected to the housing. The lever assembly has a fulcrum end, a free end and an enabling part located therebetween. The enabling part of the lever assembly is connected to the rotating block through a connecting rod 1. The rotating block is fixedly connected to the wheel shaft transmission assembly and is driven to rotate by the wheel shaft transmission assembly. The free end of the lever assembly is connected to the needle bar driving seat through a connecting rod 2. The needle bar driving seat is slidably connected to the guide column and can be vertically lifted and lowered along the guide column. The present invention adopts a new structure to replace the old cam and connecting rod mechanism, and has high transmission synchronization and stability, and good embroidery quality.

Description

Technical Field

[0001] The invention relates to the technical field of embroidery machines, in particular to a needle bar driving structure adapting to high rotation speed. Background Art

[0002] The stability of the needle bar movement of computer embroidery machines directly affects the quality of embroidery products. How to achieve high-precision and high-quality embroidery of the needle bar of embroidery machines under high-speed operation (the spindle speed of 1200r / min and above can be considered as high speed) has always been the research direction of researchers in the embroidery machine industry. At present, the needle bar drive mechanism of embroidery machines generally has the following problems: For example, the application number is CN201921496463.6 The patent document discloses a single-cam dual-drive embroidery machine head and an embroidery machine, including a first drive assembly, a second drive assembly, a driving shaft, a housing, a transmission shaft, a cam mechanism, a needle bar, a presser foot assembly, a connecting assembly and a guide member, which mainly drives the presser foot connecting rod and the needle bar connecting rod through a groove cam, thereby driving the presser foot and the needle bar respectively, that is, the cam is directly driven by the main shaft, one end of the connecting rod structure moves along the track groove on the cam and the other end is connected to the needle bar or the presser foot, and it is often necessary to set up multiple connecting rods, which are hinged to each other. Although such a cam and connecting rod structure is relatively old-fashioned, it has the advantages of simple setting and low cost, so it is more commonly used. The main disadvantages are as follows: 1. The groove cam and the connecting rod are contact-guided and not directly fixedly connected. Under high-speed operation, transmission lag or instability is prone to occur, affecting the embroidery quality; 2. Multiple connecting rods are hinged front and back, and the structural span is long, resulting in structural instability and occupying more installation space; 3. The front and back hinged connection of the connecting rod makes the entire connecting rod structure asymmetric, and its connection point with the needle bar is also on one side of the last connecting rod, which transmits unbalanced force, resulting in structural instability and insufficient penetration of the needle bar; 4. The main shaft is directly connected to the cam, and the main shaft bears a large load and is easy to be damaged. Summary of the invention

[0003] The technical purpose of the present invention is to provide a needle bar drive structure that is adaptable to high speeds, so as to solve the problems of the traditional structure being outdated, low transmission accuracy, poor structural and transmission stability and difficult to adapt to high speed operation.

[0004] The specific technical scheme of the present invention is as follows: A needle bar driving structure adapted to high rotation speed comprises a casing and a main shaft, and also comprises a wheel axle transmission assembly, a rotating block, a lever assembly, a guide column and a needle bar driving seat, the main shaft is drivingly connected to the wheel axle transmission assembly, the wheel axle transmission assembly, the lever assembly and the guide column are all fixedly connected to the casing, the lever assembly has a fulcrum end, a free end and an enabling part located therebetween; the enabling part of the lever assembly is drivingly connected to the rotating block via a connecting rod 1, the rotating block is fixedly connected to the wheel axle transmission assembly and is driven to rotate by the wheel axle transmission assembly; the free end of the lever assembly is drivingly connected to the needle bar driving seat via a connecting rod 2, the needle bar driving seat is slidably connected to the guide column and can be vertically lifted and lowered along the guide column.

[0005] Preferably, the lever assembly is symmetrical about its central section plane; or the entirety formed by the lever assembly, the connecting rod 1, the connecting rod 2 and the needle bar driving seat is symmetrical about its central section plane.

[0006] Preferably, the lever assembly includes two connecting plates, and a positioning connecting rod 1, a positioning connecting rod 2 and a positioning connecting rod 3 are connected between the two connecting plates. The positioning connecting rod 2 located in the middle serves as the enabling part and is rotatably connected to the connecting rod 1; the positioning connecting rod 3 located on the front side of the positioning connecting rod 2 serves as the free end and is rotatably connected to the connecting rod 2; the positioning connecting rod 1 located on the rear side of the positioning connecting rod 2 serves as the fulcrum end and is rotatably connected to a positioning connecting part in the casing, or is rotatably connected to a positioning connecting block fixedly connected to the casing.

[0007] Preferably, a reinforcing support rod is connected between the two connecting plates.

[0008] Preferably, the guide column passes between the two connecting pieces.

[0009] Preferably, the rotating block includes a counterweight part and a connecting part, and the connecting part is provided with a first connecting part for connecting the wheel axle transmission assembly and a second connecting part for connecting the connecting rod; the counterweight part is used to make the corresponding center of mass of the rotating block and the needle bar driving seat remain relatively stationary or have a relatively minimum change range when the rotating block and the needle bar driving seat are regarded as a whole during the synchronous movement of the rotating block and the needle bar driving seat.

[0010] Preferably, the needle bar driving seat is provided with a guide sleeve hole for sleeve-engaging the guide column, a connecting rod connecting portion for connecting the second connecting rod, and a needle bar docking portion for connecting and driving the needle bar.

[0011] Preferably, the needle bar driving seat is further provided with an outer wall opening for exposing a partial area of ​​the guide sleeve hole to the outside.

[0012] Preferably, a lubrication cavity is provided on the needle bar driving seat, a lubrication part is placed in the lubrication cavity, and an oil path is connected between the guide sleeve hole and / or the connecting rod connecting part and the lubrication cavity.

[0013] Preferably, the wheel axle transmission assembly includes a bearing seat, a transmission shaft 1, a transmission shaft 2, a gear 1 and a gear 2, the bearing seat is fixedly connected to the casing, the main shaft is transmission-connected to the transmission shaft 1, the transmission shaft 1 and the transmission shaft 2 are respectively connected to the bearing seat, the gear 1 is fixedly connected to the transmission shaft 1, the gear 2 is fixedly connected to the transmission shaft 2, and the gear 1 is meshingly connected to the gear 2; the rotating block is fixedly connected to the transmission shaft 2.

[0014] Preferably, the gear one and the gear two each include a metal molded part and a plastic molded part, the plastic molded part is injection molded outside the metal molded part, and the plastic molded part is provided with teeth and grooves, the metal molded part of the gear one is fixedly connected to the transmission shaft one, and the metal molded part of the gear two is fixedly connected to the transmission shaft two.

[0015] The technical advantages of the present invention are as follows:

[0016] 1. The old cam is replaced by a rotating block, and a wheel shaft transmission assembly is set between the main shaft and the rotating block. Compared with the traditional form of the main shaft directly driving the cam, it can withstand a larger load. The wheel shaft transmission assembly itself has higher transmission accuracy and efficiency and less noise;

[0017] 2. The rotating block rotates the connecting rod 1, with high transmission synchronization, stable operation and timely mechanical response;

[0018] 3. The connecting rod, lever assembly and needle bar connection assembly replace the old connecting rod structure, with a shorter transmission stroke, stable operation and more flexible installation space selection;

[0019] 4. The transmission structure has symmetrical parts, balanced force transmission, stable operation, and the needle bar has a higher penetration force after being driven;

[0020] In summary, the embroidery products made with the help of the device are of high quality, and the device is worthy of being promoted and used in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention (assembly diagram);

[0022] Figure 2It is a schematic diagram of the overall structure of an embodiment of the present invention (each component is separated from the housing);

[0023] Figure 3 A schematic diagram of the structure of a wheel axle transmission assembly according to an embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of a lever assembly, a rotating block and a needle bar driving seat according to an embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a lever assembly according to an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a rotating block according to an embodiment of the present invention;

[0027] Figure 7 It is a structural schematic diagram of a needle bar driving seat according to an embodiment of the present invention;

[0028] The names of the parts corresponding to the numbers in the figure are: 1-casing, 2-axle transmission assembly, 21-bearing seat, 22-transmission shaft one, 23-transmission shaft two, 24-gear one, 25-gear two, 3-rotating block, 31-counterweight part, 32-connecting part, 321-first connecting part, 322-second connecting part, 4-lever assembly, 41-connecting plate, 42-positioning connecting rod, 43-reinforcement support rod, 5-guide column, 6-needle bar driving seat, 61-guide sleeve hole, 62-connecting rod connecting part, 63-needle bar docking part, 64-outer wall opening, 65-lubrication chamber, 7-connecting rod one, 8-connecting rod two. DETAILED DESCRIPTION

[0029] The present invention will be further described below by means of specific embodiments in conjunction with the accompanying drawings:

[0030] See Figure 1 , Figure 2 , an embodiment of a needle bar driving structure adapted to high speed, includes a casing 1 and a main shaft, as well as a wheel shaft transmission assembly 2, a rotating block 3, a lever assembly 4, a guide column 5 and a needle bar driving seat 6. A supporting bearing seat is provided on the top of the casing 1, the main shaft is connected to the supporting bearing seat, the main shaft is connected to the wheel shaft transmission assembly 2 for transmission connection, the wheel shaft transmission assembly 2, the lever assembly 4, and the guide column 5 are all fixedly connected to the casing 1, the lever assembly 4 has a fulcrum end, a free end and an enabling part located therebetween; the enabling part of the lever assembly 4 is connected to the rotating block 3 through a connecting rod 1 7 for transmission connection, the rotating block 3 is fixedly connected to the wheel shaft transmission assembly 2 and is driven to rotate by the wheel shaft transmission assembly 2; the free end of the lever assembly 4 is connected to the needle bar driving seat 6 through a connecting rod 2 8 for transmission connection, the needle bar driving seat 6 is slidably connected to the guide column 5 and can be vertically lifted and lowered along the guide column 5.

[0031] In the present embodiment, the lever assembly 4, the connecting rod 1 7, the connecting rod 2 8 and the needle bar driving seat 6 form a structure that is symmetrical about its longitudinal central cutting plane. This design is because the applicant found after research and practice that the traditional old-style connecting rod transmission structure is a completely asymmetrical structure. The driving force is constantly deflected in direction during the transmission process instead of being transmitted along the center line of the structure. The local force is too large, which makes the transmission unstable, the components are easily damaged, the final movement of the needle bar is also unstable, and the penetration force is insufficient. By designing as many structural parts of the transmission structure as possible to be symmetrical, the aforementioned adverse effects can be weakened or avoided. Therefore, there is a highly symmetrical design such as the above-mentioned present embodiment. In some embodiments, due to other reasons, such as to facilitate the assembly and arrangement of other components in the housing 1, etc., it is also possible to choose to design only the lever assembly 4 into a symmetrical structure. Although the symmetry is compromised, it still has the effect of making the transmission stable and balanced, which is better than the traditional old-style connecting rod structure. The following will describe the various parts of the present device in detail.

[0032] For the axle transmission assembly 2, see Figure 3, which includes a bearing seat 21, a transmission shaft 1 22, a transmission shaft 23, a gear 1 24 and a gear 2 25. The bearing seat 21 is fixedly connected to the casing 1 (a connecting bearing corresponding to the two transmission shafts is provided in the bearing seat 21), the transmission shaft 1 22 and the transmission shaft 2 23 are respectively connected to the bearing seat 21, the main shaft is connected to the transmission shaft 1 22, the gear 1 24 is fixedly connected to the transmission shaft 1 22, the gear 2 25 is fixedly connected to the transmission shaft 23, and the gear 1 24 is meshed with the gear 2 25; the rotating block 3 is fixedly connected to the transmission shaft 2 23, that is, the main shaft drives the transmission shaft 1 22 to rotate (the simplest, the pulley arranged on the main shaft and the pulley arranged on the transmission shaft 1 22 are connected to each other through belt transmission), and because the gear 1 24 is meshed with the gear 2 25, the transmission shaft 1 22 drives the transmission shaft 2 23 to rotate, and the transmission shaft 23 drives the rotating block 3 to rotate. Gear 1 24 and gear 2 25 each include a metal part and a plastic part. The plastic part is injection molded outside the metal part, and a tooth groove is provided on the plastic part. The metal part of gear 1 24 is fixedly connected to the transmission shaft 1 22, and the metal part of gear 2 25 is fixedly connected to the transmission shaft 2 23. In this embodiment, the metal part and the shaft are integrally molded. Gear 1 24 and gear 2 25 adopt such a split design which is different from the traditional gear because the traditional gear made of all metal material has a large error due to the limitation of processing technology. When the gears are meshed and transmitted, there is a transmission gap, which is unstable and affects the embroidery processing and quality. The plastic part is easy to process, has good controllability of the gap error, and the noise during transmission is greatly reduced, and the cost is also reduced. The metal part itself is convenient and firm to be molded with the shaft, and the plastic part is also molded with the metal part. Therefore, the gear 1 24 and gear 2 25 in this scheme are completely different from and better than the design of the traditional gear, which can significantly improve the transmission accuracy and effectively improve the embroidery quality.

[0033] For lever assembly 4, see Figure 4 , Figure 5, which includes two connecting pieces 41, which are of the same shape and symmetrical, and are connected with a positioning connecting rod 1 42, a positioning connecting rod 2 42' and a positioning connecting rod 3 42'' between the two connecting pieces 41. In the figure, between the tail ends, between the head ends and between the middle sections of the two connecting pieces 41 are the positioning connecting rod 1 42, the positioning connecting rod 3 42'' and the positioning connecting rod 2 42' (of course, more similar positioning connecting rods can also be provided as required). The positioning connecting rod 1 42 located between the tail ends of the connecting pieces 41 is rotatably connected to a positioning connecting block as a fulcrum end, and the positioning connecting block is fixedly connected to the inner wall of the housing 1. In some other embodiments, the positioning connecting block may not be selected, but a positioning connecting portion may be preset on the inner wall of the housing 1 to be rotatably connected to the positioning connecting rod 1 42 located at the tail ends of the connecting pieces 41. The positioning connecting rod 2 42' located between the middle sections of the connecting pieces 41 is rotatably connected to the lower end of the connecting rod 1 7 as an enabling portion. The positioning connecting rod 3 42 ″ located between the head ends of the connecting pieces 41 is rotatably connected to the lower end of the connecting rod 2 8 as a free end.

[0034] The design of the two connecting pieces 41 is due to the need for a symmetrical structure, so that the points of force transmission are balanced on the central section to improve the transmission stability, and secondly, because the improved sheet connection structure can reduce weight and air resistance compared to the traditional connecting rod structure, and the movement noise is relatively smaller. In this embodiment, the connection points of the connecting piece 41 corresponding to the three positioning connecting rods are the head, tail and middle of the connecting piece 41, and the connection is more balanced and stable. A reinforcing support rod 43 is also connected between the two connecting pieces 41, which is arranged between adjacent positioning connecting rods. This is to further ensure that the connecting piece 41 has sufficient strength under high-speed operation. The guide column 5 passes through the interval space between the two connecting pieces 41 near the head end. On the basis of making the structure of the lever assembly 4 large enough to have higher structural strength and better transmission stability, the assembly position of the guide column 5 and the lever assembly 4 in the housing 1 is optimized. At the same time, the guide column 5 is arranged in this way so that it and the lever assembly 4 as a whole can also present a symmetrical structure.

[0035] For rotating block 3, see Figure 6The rotating block 3 includes a counterweight part 31 and a connecting part 32. In this embodiment, the rotating block 3 is designed as a fan-shaped special-shaped block as shown in the figure. The fan body part is the counterweight part 31, and the fan handle part is the connecting part 32. The connecting part 32 is provided with a first connecting part 321 for connecting the wheel shaft transmission assembly 2, that is, for connecting the transmission shaft 23, and a second connecting part 322 for connecting the upper end of the connecting rod 1 7. The two connecting parts in the figure are in the form of connecting holes. The hole of the first connecting part 321 has a gap, and the gap extends all the way out of the counterweight part 31. The counterweight part 31 is matched with a fixing screw hole and a fixing screw, and the transmission shaft 23 is held tightly by the first connecting part 321. The second connecting part 322 and the connecting rod 1 7 are connected in rotation through conventional bearings and connecting pins.

[0036] The counterweight part 31 is used to keep the corresponding center of mass of the rotating block 3 and the needle bar drive seat 6 relatively stationary or with a relatively minimum range of change when the rotating block 3 and the needle bar drive seat 6 are regarded as a whole during synchronous movement, so that the rotating block 3 and the needle bar drive seat 6 can be kept in a dynamic balance state as much as possible during operation, especially in high-speed movement, to reduce the structural shaking phenomenon during operation, and the transmission is more stable, the response is more timely, and the components are less likely to be damaged. The corresponding operation performance can be described in the following example, that is, when the needle bar drive seat 6 moves to the lowest point along the guide column 5, the counterweight part 31 rotates to the side position farthest from the needle bar drive seat 6; when the needle bar drive seat 6 moves to the highest point along the guide column 5, the counterweight part 31 rotates to the side position closest to the needle bar drive seat 6. Of course, the two relative rotation positions mentioned above are possible situations (for example, when the needle bar drive seat 6 moves to the lowest or highest position, the counterweight part 31 may also rotate to a position near the farthest or closest point to the needle bar drive seat 6 mentioned above). It is actually related to the mass, distance and predetermined change requirements of the center of mass of the rotating block 3 and the needle bar drive seat 6 when the two are regarded as a whole. The corresponding operating performance can be determined through multiple preliminary tests.

[0037] The rotating block 3 is different from the cam in the traditional structure. The rotating block 3 is connected to the connecting rod 7 in rotation and drives the connecting rod 7 to reciprocate. The transmission synchronization is obviously better than the cam driving form in the traditional structure, because the connecting rod 7 does not extend into the groove of the cam and moves along the groove of the cam, and there is no contact gap. Even in the high-speed operation state, it is not easy to cause transmission lag and transmission instability. In addition, the main shaft is not directly connected to the rotating block 3, but a wheel shaft transmission assembly 2 is set between the two. Compared with the form of the main shaft directly connected to drive the cam in the traditional structure, this part of the structural design in this scheme can effectively reduce the load of the main shaft, and the gear transmission form of the wheel shaft transmission assembly 2 itself has higher transmission accuracy and transmission efficiency, and less noise.

[0038] For needle bar drive seat 6, see Figure 7 The needle bar driving seat 6 is provided with a guide sleeve hole 61 for sleeve-connecting the guide column 5, a connecting rod connecting part 62 for connecting the connecting rod 8, and a needle bar docking part 63 for connecting and driving the needle bar. In this embodiment, the needle bar driving seat 6 itself is also a symmetrical structure, and the guide sleeve hole 61 has a central section that coincides with the central section of the needle bar driving seat 6. The connecting rod connecting part 62 is a connecting cavity opened in the needle bar driving seat 6, and the central section of the connecting cavity also coincides with the central section of the needle bar driving seat 6. The needle bar docking part 63 is a horizontally penetrating groove that opens toward the side where the needle bar is located, because the needle bar frame is slidably connected to the housing 1, and the needle bar is also provided with a needle bar driving block, and the needle bar driving block has a docking joint that matches the groove. When the needle bar driving block moves horizontally with the needle bar frame, it can slide horizontally into the groove. The central section of the needle bar docking part 63 also coincides with the central section of the needle bar driving seat 6 and is bilaterally symmetrical. The needle bar driving seat 6 is also provided with an outer wall opening 64 for exposing a part of the guide sleeve hole 61 to the outside, so as to reduce the contact surface between the inner wall of the guide sleeve hole 61 and the guide column 5, thereby reducing the friction resistance and making the lifting and lowering of the needle bar driving seat 6 smoother. A lubrication cavity 65 is also provided on the top of the needle bar driving seat 6, and a lubricating member such as felt is placed in the lubrication cavity 65. The guide sleeve hole 61 and the connecting rod connecting part 62 are all connected to the lubrication cavity 65 through an oil path.

[0039] It is worth mentioning that in actual products, the "symmetry" mentioned above cannot be strictly regarded as "symmetry" in an absolute sense. For example, due to process or assembly interference or connection needs, the connecting piece 41 may have some subtle changes somewhere (such as a notch or a protrusion or an opening, etc.), which results in the two connecting pieces 41 not being absolutely symmetrical. However, from the perspective of the overall structure, it should be considered that it still belongs to a symmetrical design, and it itself is still intended to obtain and can obtain the optimization effect brought about by the aforementioned symmetrical design.

[0040] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A needle bar driving structure adapted to high rotation speed, comprising a housing (1) and a main shaft, characterized in that: It also includes a wheel shaft transmission assembly (2), a rotating block (3), a lever assembly (4), a guide column (5) and a needle bar drive seat (6), wherein the main shaft is connected to the wheel shaft transmission assembly (2), the wheel shaft transmission assembly (2), the lever assembly (4) and the guide column (5) are all fixedly connected to the housing (1), and the lever assembly (4) has a fulcrum end, a free end and an enabling portion located between the two; the enabling portion of the lever assembly (4) is connected to the rotating block (3) through a connecting rod 1 (7), the rotating block (3) is fixedly connected to the wheel shaft transmission assembly (2) and is driven to rotate by the wheel shaft transmission assembly (2); the free end of the lever assembly (4) is connected to the needle bar drive seat (6) through a connecting rod 2 (8), and the needle bar drive seat (6) is slidably connected to the guide column (5) and can be vertically lifted and lowered along the guide column (5); The lever assembly (4) comprises two connecting plates (41), a positioning connecting rod 1 (42), a positioning connecting rod 2 (42') and a positioning connecting rod 3 (42'') are connected between the two connecting plates (41), and the positioning connecting rod 2 (42') located in the middle serves as the enabling part and is rotatably connected to the connecting rod 1 (7); The positioning connecting rod 3 (42'') located at the front side of the positioning connecting rod 2 (42') serves as the free end portion and is rotatably connected to the connecting rod 2 (8); The first positioning connecting rod (42) located at the rear side of the second positioning connecting rod (42') serves as the fulcrum end and is rotatably connected to a positioning connecting portion in the housing (1), or is rotatably connected to a positioning connecting block fixedly connected to the housing (1); The rotating block (3) comprises a counterweight portion (31) and a connecting portion (32), wherein the connecting portion (32) is provided with a first connecting portion (321) for connecting to the wheel shaft transmission assembly (2) and a second connecting portion (322) for connecting to the connecting rod 1 (7); the counterweight portion (31) is used to keep the corresponding center of mass of the rotating block (3) and the needle bar driving seat (6) relatively stationary or with a relatively minimum change range when the rotating block (3) and the needle bar driving seat (6) are considered as a whole during the synchronous movement of the rotating block (3) and the needle bar driving seat (6); The wheel shaft transmission assembly (2) comprises a bearing seat (21), a transmission shaft 1 (22), a transmission shaft 2 (23), a gear 1 (24) and a gear 2 (25); the bearing seat (21) is fixedly connected to the housing (1); the main shaft is transmission-connected to the transmission shaft 1 (22); the transmission shaft 1 (22) and the transmission shaft 2 (23) are respectively connected to the bearing seat (21); the gear 1 (24) is fixedly connected to the transmission shaft 1 (22); the gear 2 (25) is fixedly connected to the transmission shaft 2 (23); the gear 1 (24) is meshingly connected to the gear 2 (25); and the rotating block (3) is fixedly connected to the transmission shaft 2 (23).

2. A needle bar driving structure adapted to high speed according to claim 1, characterized in that: The lever assembly (4) is symmetrical about its central section plane; or the entirety formed by the lever assembly (4), the connecting rod 1 (7), the connecting rod 2 (8) and the needle bar drive seat (6) is symmetrical about its central section plane.

3. The needle bar driving structure adapted to high speed according to claim 1, characterized in that: A reinforcing support rod (43) is also connected between the two connecting pieces (41).

4. The needle bar driving structure adapted to high rotation speed according to claim 1, characterized in that: The guide column (5) passes between the two connecting pieces (41).

5. The needle bar driving structure adapted to high rotation speed according to claim 1, characterized in that: The needle bar driving seat (6) is provided with a guide sleeve hole (61) for sleeve-engaging the guide column (5), a connecting rod connecting portion (62) for connecting the second connecting rod (8), and a needle bar docking portion (63) for connecting and driving the needle bar.

6. The needle bar driving structure adapted to high rotation speed according to claim 5, characterized in that: The needle bar drive seat (6) is also provided with an outer wall opening for exposing a portion of the guide sleeve hole (61) to the outside.

7. The needle bar driving structure adapted to high rotation speed according to claim 1, characterized in that: The gear 1 (24) and the gear 2 (25) each comprise a metal part and a plastic part, wherein the plastic part is injection-molded outside the metal part and the plastic part is provided with tooth grooves, the metal part of the gear 1 (24) is fixedly connected to the transmission shaft 1 (22), and the metal part of the gear 2 (25) is fixedly connected to the transmission shaft 2 (23).

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