Embroidery machine

Abstract

The application relates to the technical field of embroidery machine equipment, and discloses an embroidery machine which comprises a base, the top of the base is fixedly connected with a shell, the top of the shell is provided with a needle plate, the outer sides of the base are both provided with driving mechanisms, the middle part of the shell is provided with a supporting shaft, the outer periphery of the supporting shaft is provided with a rotating shuttle, the outer periphery of the supporting shaft is provided with a thread cutting assembly, a connecting rod assembly is arranged between the thread cutting assembly and the two driving mechanisms, the output ends of the two driving mechanisms are respectively connected with pull rods, the thread cutting assembly comprises a first rotating ring and a second rotating ring, the first rotating ring and the second rotating ring are both rotationally connected to the outer periphery of the supporting shaft, and the outer periphery of the supporting shaft is respectively provided with a first annular groove and a second annular groove. The relative rotation shearing mode prevents the displacement of thread ends, the relative rotation shearing mode shortens the length of the thread ends reserved after shearing, and the embroidery quality is improved.

Description

Technical Field

[0001] This invention relates to the field of embroidery machine equipment technology, specifically to embroidery machines. Background Technology

[0002] During the operation of an embroidery machine, the thread-cutting device is used to cut the thread when sewing is finished or when changing threads. Embroidery machines frequently need to change colors or perform jump stitches across different areas. Before performing jump stitches, the top and bottom threads must be cut. The precision of the thread-cutting device directly determines the smoothness of the finished embroidery.

[0003] Traditional embroidery machine thread-cutting devices typically use a horizontally moving flat blade to cut the thread ends. In a traditional flat-push blade, the blade moves forward to contact the thread during the cutting action. There is a travel distance between contacting the thread and completely cutting it. During this travel, the blade pushes the thread forward, creating a pushing displacement that causes the actual cutting point to deviate from the bottom of the needle plate. This deviation results in excessively long thread ends remaining on the fabric after cutting, leading to messy thread segments on the back of the embroidery.

[0004] Meanwhile, embroidery often uses a mixture of different colors and materials of silk thread. Different colors and materials of silk thread have different physical properties. Traditional thread cutting devices usually adopt a fixed stroke mechanical transmission structure. The fixed stroke mechanical transmission structure keeps the cutting position of the flat blade in a fixed state. The operator cannot change the cutting position. The operator cannot flexibly adjust the length of the thread end to be retained according to the process requirements of different colored silk threads. The fixed cutting position cannot meet the diverse sewing needs. Thread ends of unsuitable length are prone to unraveling during subsequent washing or friction.

[0005] Furthermore, the embroidery process requires the silk thread to be knotted before cutting. Knotting prevents the thread from falling off. Traditional thread-cutting devices can only perform one cutting action according to a fixed procedure. Traditional thread-cutting devices lack secondary action control functions. The excess waste thread generated after knotting cannot be cut off a second time. The excess waste thread remains at the knotted position, forming a protruding hard knot. The protruding hard knot remains on the fabric surface, affecting the embroidery quality and reducing the comfort of wearing embroidered clothing. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an embroidery machine that solves the problems of traditional embroidery machines using flat blade cutting devices that cause thread end displacement resulting in excessively long retained thread ends, fixed-stroke mechanical transmission structures that cannot adjust the retained thread end length according to different thread processing requirements, and the lack of secondary cutting action control function that results in waste thread residue after knotting.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an embroidery machine, comprising a base, a housing fixedly connected to the top of the base, a needle plate provided on the top of the housing, drive mechanisms provided at both ends of the outer side of the base, a support shaft provided in the middle of the housing, a rotary hook provided on the outer periphery of the support shaft, a thread-cutting assembly provided on the outer periphery of the support shaft, a connecting rod assembly provided between the thread-cutting assembly and the two drive mechanisms, and pull rods connected to the output ends of the two drive mechanisms respectively; The tangent assembly includes a first rotating ring and a second rotating ring, both of which are rotatably connected to the outer periphery of the support shaft. The outer periphery of the support shaft is provided with a first annular groove and a second annular groove, respectively. The first rotating ring and the second rotating ring are rotatably connected to the middle of the first annular groove and the second annular groove, respectively. A first blade and a second blade are fixedly connected to the outer sides of the first rotating ring and the second rotating ring, respectively.

[0008] Furthermore, the linkage assembly includes a first connecting block and a second connecting block, which are respectively fixedly connected to the outer periphery of the two pull rods. A first connecting rod and a second connecting rod are rotatably connected to the outer sides of the first connecting block and the second connecting block, respectively. A first rotating rod and a second rotating rod are rotatably connected to the other ends of the first rotating rod and the second rotating rod, respectively. A first connecting rod and a second connecting rod are rotatably connected to the other ends of the first connecting rod and the second connecting rod, respectively. The other ends of the first connecting rod and the second connecting rod are respectively connected to the first rotating ring and the second rotating ring.

[0009] Furthermore, a first rotating shaft and a second rotating shaft are fixedly connected to the outer side of the outer shell, the first rotating rod is rotatably connected to the outer periphery of the first rotating shaft, and the second rotating rod is rotatably connected to the outer periphery of the second rotating shaft.

[0010] Furthermore, a limiting plate is fixedly connected to the outer side of the outer shell, and the second rotating rod is located between the limiting plate and the outer shell.

[0011] Furthermore, a slot is provided in the middle of the rotary hook, a fixing block is fixedly connected to the middle of the outer shell, a locking block is fixedly connected to the outside of the fixing block, and the locking block is engaged in the middle of the slot.

[0012] Furthermore, a support frame is fixedly connected to the top of the base, and a frame body is fixedly connected to the outside of the support frame for mounting the needle insertion device directly above the needle plate.

[0013] Furthermore, a wire end clamping plate is provided at the bottom of the outer casing to fix the wire end, and a positioning rod is fixedly connected to the middle of the frame, with the outer casing disposed on the outer periphery of the positioning rod.

[0014] Furthermore, a first positioning frame and a second positioning frame are fixedly connected to both sides of the outer casing, and the two pull rods are slidably connected to the middle of the first positioning frame and the second positioning frame, respectively.

[0015] This invention provides an embroidery machine. It has the following beneficial effects: 1. In this invention, the first connecting rod drives the first blade through the first rotating ring, and the second connecting rod drives the second blade through the second rotating ring. Ultimately, the first blade and the second blade rotate relative to each other on the outer periphery of the rotary hook. The tangential position of the first blade and the second blade is attached to the bottom of the needle plate. Traditional flat-push blades will push the thread end forward, resulting in an excessively long residual thread end. The relative rotation cutting method of this invention prevents the thread end from shifting. The relative rotation cutting method shortens the length of the thread end retained after cutting, thus improving the embroidery quality.

[0016] 2. This invention uses a background program to pre-set the output stroke and speed changes of the drive mechanism, thereby altering the angle between the second and first blades. The output changes of the drive mechanism adjust the tangential position around the outer periphery of the rotary hook, allowing the operator to precisely cut the threads according to the desired length of the end. Furthermore, after the threads are knotted, the second and first blades again perform a closing shearing action under the drive mechanism. This secondary shearing action removes any excess thread after knotting, ensuring no waste thread remains.

[0017] 3. The present invention uses a limiting plate fixedly connected to the outside of the outer shell. The second rotating rod is located between the limiting plate and the outer shell. The limiting plate prevents the second rotating rod from shaking during the pushing and pulling process. The first positioning frame and the second positioning frame provide limiting support for the pull rod, eliminating the shaking caused by the excessive length of the pull rod. The multiple limiting structure ensures the stability and safety of the internal transmission mechanism of the equipment. Attached Figure Description

[0018] Figure 1 This is a perspective view of the embroidery machine of the present invention; Figure 2 This is a schematic diagram of the linkage assembly of the present invention; Figure 3 This is a bottom view of the linkage assembly of the present invention; Figure 4 This is an exploded view of the tangent assembly of the present invention.

[0019] Figure label: 1. Base; 2. Support frame; 3. Frame body; 4. Positioning rod; 5. Outer shell; 6. Needle plate; 7. Drive mechanism; 8. Thread end clamping plate; 9. Support shaft; 10. Second annular groove; 11. Pull rod; 12. First annular groove; 13. First positioning frame; 14. Second positioning frame; 15. First rotating shaft; 16. Second rotating shaft; 17. First connecting block; 18. First connecting rod; 19. First rotating rod; 20. First connecting rod; 21. Second connecting block; 22. Second connecting rod; 23. Second rotating rod; 24. Second connecting rod; 25. Limiting plate; 26. Rotary hook; 27. Fixing block; 28. First blade; 29. ​​First rotating ring; 30. Second rotating ring; 31. Second blade; 32. Locking block; 33. Locking groove. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1-3 The present invention provides an embroidery machine, including a base 1, a housing 5 fixedly connected to the top of the base 1, a needle plate 6 provided on the top of the housing 5, a drive mechanism 7 provided at both ends of the outer side of the base 1, a support shaft 9 provided in the middle of the housing 5, a rotary hook 26 provided on the outer periphery of the support shaft 9, a thread cutting assembly provided on the outer periphery of the support shaft 9, a connecting rod assembly provided between the thread cutting assembly and the two drive mechanisms 7, and a pull rod 11 connected to the output end of the two drive mechanisms 7 respectively.

[0022] In one specific embodiment, the base 1 serves as a basic support, the outer shell 5 is installed on top of the base 1, and the needle plate 6 is located on top of the outer shell 5. When the embroidery machine is running, the fabric is pulled over the needle plate 6. Drive mechanisms 7 on both sides of the base 1 generate mechanical power and output it through pull rods 11. A support shaft 9 is fixedly installed inside the center of the outer shell 5. The rotary hook 26 and the thread-cutting assembly are both installed outside the support shaft 9. A connecting rod assembly is arranged between the pull rod 11 of the drive mechanism 7 and the thread-cutting assembly. The connecting rod assembly is used to transmit the linear push-pull power output by the drive mechanism 7 to the thread-cutting assembly. After receiving the power, the thread-cutting assembly rotates outside the support shaft 9, and the thread-cutting assembly, in conjunction with the rotary hook 26, completes the cutting action of the sewing thread.

[0023] See appendix Figure 4The tangent assembly includes a first rotating ring 29 and a second rotating ring 30. Both the first rotating ring 29 and the second rotating ring 30 are rotatably connected to the outer periphery of the support shaft 9. The outer periphery of the support shaft 9 is provided with a first annular groove 12 and a second annular groove 10, respectively. The first rotating ring 29 and the second rotating ring 30 are rotatably connected to the middle of the first annular groove 12 and the second annular groove 10, respectively. The outer sides of the first rotating ring 29 and the second rotating ring 30 are respectively fixedly connected with a first blade 28 and a second blade 31.

[0024] In one specific embodiment, the first annular groove 12 and the second annular groove 10 on the surface of the support shaft 9 respectively restrict the axial displacement of the first rotating ring 29 and the second rotating ring 30. The first rotating ring 29 and the second rotating ring 30 maintain free rotation outside the support shaft 9. The first rotating ring 29 drives the first blade 28 to rotate synchronously, and the second rotating ring 30 drives the second blade 31 to rotate synchronously. The first blade 28 and the second blade 31 rotate relative to each other in opposite directions around the rotary hook 26, forming a closed tangential action similar to scissors. The tangential position of the first blade 28 and the second blade 31 is in contact with the bottom area of ​​the needle plate 6. The traditional flat-push blade will push the thread end forward, resulting in an excessively long residual thread end. The relative rotation shearing method prevents the thread end from displacing, and the relative rotation shearing method shortens the length of the thread end retained after cutting.

[0025] In one specific embodiment, the drive mechanism 7 can be a linear drive mechanism such as a cylinder, linear motor, or electric push rod. The drive mechanism 7 outputs linear reciprocating power to directly push and pull the pull rod 11. The operator presets the operating stroke and speed parameters of the drive mechanism 7 in the background program. The drive mechanism 7 outputs push and pull strokes of different distances according to the preset program. The change in the stroke of the pull rod 11 causes the tangential angle between the first blade 28 and the second blade 31 to change. The shearing tangential position moves around the periphery of the rotary hook 26, thereby enabling precise control of the length of the retained thread end according to the process requirements of different colored threads. The thread enters through the notch of the second blade 31, and the outer mechanism of the rotary hook 26 completes the knotting step. After the knotting step is completed, the drive mechanism 7 starts again to drive the first blade 28 and the second blade 31 to close. The first blade 28 and the second blade 31 perform a secondary shearing action, which removes the excess waste thread generated by the knotting.

[0026] See appendix Figure 2-4The linkage assembly includes a first connecting block 17 and a second connecting block 21. The first connecting block 17 and the second connecting block 21 are respectively fixedly connected to the outer periphery of two pull rods 11. The outer sides of the first connecting block 17 and the second connecting block 21 are respectively rotatably connected to a first connecting rod 18 and a second connecting rod 22. The other ends of the first connecting rod 18 and the second connecting rod 22 are respectively rotatably connected to a first rotating rod 19 and a second rotating rod 23. The other ends of the first rotating rod 19 and the second rotating rod 23 are respectively rotatably connected to a first connecting rod 20 and a second connecting rod 24. The other ends of the first connecting rod 20 and the second connecting rod 24 are respectively connected to a first rotating ring 29 and a second rotating ring 30. The outer side of the outer shell 5 is respectively fixedly connected to a first rotating shaft 15 and a second rotating shaft 16. The first rotating rod 19 is rotatably connected to the outer periphery of the first rotating shaft 15, and the second rotating rod 23 is rotatably connected to the outer periphery of the second rotating shaft 16.

[0027] In one specific embodiment, the two drive mechanisms 7 respectively output power to drive the two pull rods 11 to perform linear reciprocating motion. The linear motion of the pull rods 11 pushes the first connecting block 17 and the second connecting block 21 to move. The first connecting rod 18 transmits the thrust of the first connecting block 17 to the first rotating rod 19. The first rotating rod 19 swings around the first rotating shaft 15. The swing of the first rotating rod 19 pushes the first connecting rod 20. The first connecting rod 20 causes the first rotating ring 29 to rotate on the surface of the support shaft 9. In the synchronous operation state, the second connecting rod 22 transmits the thrust of the second connecting block 21 to the second rotating rod 23. The second rotating rod 23 swings around the second rotating shaft 16. The second rotating rod 23 pushes the second connecting rod 24. The second connecting rod 24 causes the second rotating ring 30 to rotate. The linkage mechanism converts the linear motion output by the two drive mechanisms 7 into the arc rotational motion of the first rotating ring 29 and the second rotating ring 30.

[0028] See appendix Figure 2 and 3 A limiting plate 25 is fixedly connected to the outer side of the outer shell 5, and the second rotating rod 23 is located between the limiting plate 25 and the outer shell 5.

[0029] In one specific embodiment, the limiting plate 25 is fixed to the outer wall of the housing 5, and the second rotating rod 23 is inserted in the gap between the housing 5 and the limiting plate 25. The linkage assembly is subjected to complex forces during high-speed push-pull operation, and the second rotating rod 23 swings along the set trajectory. The limiting plate 25 blocks the space margin for the second rotating rod 23 to shift outward, preventing the second rotating rod 23 from swaying laterally during movement, ensuring accurate transmission of mechanical power, and preventing the linkage structure from twisting and rubbing against the support shaft 9, which could cause equipment damage.

[0030] See appendix Figure 3 and 4The rotary hook 26 has a slot 33 in the middle, and a fixing block 27 is fixedly connected to the middle of the outer shell 5. A locking block 32 is fixedly connected to the outside of the fixing block 27, and the locking block 32 is engaged in the middle of the slot 33.

[0031] In one specific embodiment, the rotary hook 26 has a groove 33 machined on its surface, and a locking block 32 is fixed to the side of the fixing block 27. The locking block 32 is embedded in the groove 33, so that the outer shell 5 locks the rotary hook 26 in place by the fixing block 27 and the locking block 32. When the blade parts around the rotary hook 26 rotate at high speed, the rotary hook 26 body remains stationary. The locking structure prevents the rotary hook 26 from deflecting or displacing, and the locking structure ensures the stability of the internal mechanism of the equipment.

[0032] See appendix Figure 1 A support frame 2 is fixedly connected to the top of the base 1, and a frame 3 is fixedly connected to the outside of the support frame 2, which is used to install the needle insertion device directly above the needle plate 6.

[0033] In one specific embodiment, the support frame 2 is fixed to the top of the base 1, and the frame body 3 is connected to the side of the support frame 2 at a high position to provide a high-level suspension support point. The needle-feeding device is installed below the frame body 3. The frame body 3 ensures that the needle-feeding device is directly above the center hole of the needle plate 6. The needle-feeding device can move downwards and directly enter the interior of the outer shell 5, ensuring that the needle-feeding device carries the top thread and completes the interlacing and sewing process with the bottom thread inside the rotary hook 26.

[0034] See appendix Figure 3 and 4 The bottom of the outer casing 5 is provided with a wire end clamping plate 8, which is used to fix the wire end. A positioning rod 4 is fixedly connected to the middle of the frame 3, and the outer casing 5 is set on the outer periphery of the positioning rod 4.

[0035] In one specific embodiment, the thread end pressure plate 8 is installed at the bottom of the housing 5. The first blade 28 and the second blade 31 will generate a pulling force on the thread when they perform the closing cutting action. The thread end pressure plate 8 provides clamping resistance and presses and fixes the thread end waiting to be cut. The thread end pressure plate 8 prevents the thread end from being pushed by the blade and causing displacement. The positioning rod 4 is fixed in the center of the frame 3. The housing 5 is sleeved on the outside of the positioning rod 4. The positioning rod 4 acts as the central positioning post of the housing 5. The positioning rod 4 ensures that the vertical axis of the thread cutting device inside the housing 5 is aligned with the vertical axis of the needle-feeding device above.

[0036] See appendix Figure 2 and 3 The outer shell 5 is fixedly connected to the first positioning frame 13 and the second positioning frame 14 on both sides respectively, and the two pull rods 11 are slidably connected to the middle of the first positioning frame 13 and the second positioning frame 14 respectively.

[0037] In one specific embodiment, the first positioning frame 13 and the second positioning frame 14 are installed on the two side walls of the outer casing 5. The pull rod 11 passes through the first positioning frame 13 and the second positioning frame 14. The pull rod 11 has a slender rod-like structure. The pull rod 11 is prone to bending and deformation under push and pull force. The first positioning frame 13 and the second positioning frame 14 provide mid-section positioning support for the pull rod 11. The pull rod 11 slides linearly inside the holes of the first positioning frame 13 and the second positioning frame 14. The first positioning frame 13 and the second positioning frame 14 eliminate the resonance and vibration phenomenon caused by the excessive length of the pull rod 11.

[0038] Working principle: During the operation of the embroidery machine, the fabric is pulled by the outside and passes over the needle plate 6. Embroidery is performed by the needle-feeding mechanism installed on the frame 3 and the rotary hook 26 inside the outer shell 5. However, in traditional embroidery machines, the thread ends are cut by a horizontally moving flat blade during the embroidery thread-cutting process. This causes the thread ends to move with the blade, resulting in excessively long thread ends, which affects the embroidery quality and effect. The present invention generates linear reciprocating power through the drive mechanisms 7 on both sides of the base 1, thereby pulling or pushing the two pull rods 11 respectively. Under the action of the two pull rods 11, the first connecting block 17, the first connecting rod 18, the first rotating rod 19, the first connecting rod 20, the second connecting block 21, the second connecting rod 22, the second rotating rod 23, and the second connecting rod 24 are driven respectively. This allows the first connecting rod 20 to drive the first blade 28 through the first rotating ring 29, and the second connecting rod 24 to drive the second blade 31 through the second rotating ring 30. Ultimately, the first blade 28 and the second blade 31 rotate relative to each other on the outer periphery of the rotary hook 26. The tangent position of the first blade 28 and the second blade 31 is relatively close to the bottom of the needle plate 6, which can make the cut thread shorter.

[0039] When different lengths of thread ends need to be retained depending on the color or material of the thread, the staff can pre-set the output stroke and speed of the drive mechanism 7 according to the sewing sequence through the background program. This will change the angle between the second blade 31 and the first blade 28, thereby adjusting the tangent position on the outer periphery of the rotary hook 26. This allows for precise cutting of the thread ends that need to be retained according to different threads, thus retaining the appropriate thread end length and ensuring practicality.

[0040] Furthermore, since the thread enters through the notch of the second blade 31 and is then driven to knot by the rotation mechanism on the outside of the rotary hook 26, after knotting, the second blade 31 and the first blade 28 will again perform a closing shearing action under the action of the drive mechanism 7, thereby cutting off the excess waste thread after knotting and ensuring that the surface is flat after knotting.

[0041] Meanwhile, the second rotating rod 23 is located between the limiting plate 25 and the outer shell 5. Therefore, under the limiting action of the limiting plate 25, the second rotating rod 23 can be prevented from shaking during pulling or pushing, ensuring operational safety and preventing damage to the support shaft 9. Similarly, the first positioning frame 13 and the second positioning frame 14 also limit the movement of the two pull rods 11, preventing the pull rods 11 from shaking or deforming during movement due to excessive length.

[0042] Furthermore, the fixing block 27 installed on the outer casing 5 allows the rotary hook 26 to be fixed under the action of the locking block 32 and the locking groove 33, preventing the rotary hook 26 from shaking or shifting when the outer peripheral blade rotates, thus ensuring stability. At the same time, the wire end clamping plate 8 installed at the bottom of the outer casing 5 can clamp and fix the wire end when cutting, preventing the wire end from being pulled and shifted when the second blade 31 and the first blade 28 close for cutting.

Claims

1. An embroidery machine, comprising a base (1), characterized in that, The top of the base (1) is fixedly connected to the outer shell (5), the top of the outer shell (5) is provided with a needle plate (6), the outer ends of the base (1) are provided with drive mechanisms (7), the middle of the outer shell (5) is provided with a support shaft (9), the outer periphery of the support shaft (9) is provided with a rotary hook (26), the outer periphery of the support shaft (9) is provided with a tangent assembly, the tangent assembly is provided with a connecting rod assembly between the two drive mechanisms (7), and the output ends of the two drive mechanisms (7) are respectively connected with pull rods (11). The tangent assembly includes a first rotating ring (29) and a second rotating ring (30). The first rotating ring (29) and the second rotating ring (30) are rotatably connected to the outer periphery of the support shaft (9). The outer periphery of the support shaft (9) is provided with a first annular groove (12) and a second annular groove (10). The first rotating ring (29) and the second rotating ring (30) are rotatably connected to the middle of the first annular groove (12) and the second annular groove (10). A first blade (28) and a second blade (31) are fixedly connected to the outer side of the first rotating ring (29) and the second rotating ring (30). The linkage assembly includes a first connecting block (17) and a second connecting block (21). The first connecting block (17) and the second connecting block (21) are respectively fixedly connected to the outer periphery of the two pull rods (11). The outer sides of the first connecting block (17) and the second connecting block (21) are respectively rotatably connected to a first connecting rod (18) and a second connecting rod (22). The other ends of the first connecting rod (18) and the second connecting rod (22) are respectively rotatably connected to a first rotating rod (19) and a second rotating rod (23). The other ends of the first rotating rod (19) and the second rotating rod (23) are respectively rotatably connected to a first connecting rod (20) and a second connecting rod (24). The other ends of the first connecting rod (20) and the second connecting rod (24) are respectively connected to the first rotating ring (29) and the second rotating ring (30). The outer side of the outer shell (5) is fixedly connected to a first rotating shaft (15) and a second rotating shaft (16), the first rotating rod (19) is rotatably connected to the outer periphery of the first rotating shaft (15), and the second rotating rod (23) is rotatably connected to the outer periphery of the second rotating shaft (16); A support frame (2) is fixedly connected to the top of the base (1), and a frame (3) is fixedly connected to the outside of the support frame (2) for installing the needle insertion device directly above the needle plate (6). The bottom of the outer shell (5) is provided with a wire end pressure plate (8) to fix the wire end. The middle part of the frame (3) is fixedly connected with a positioning rod (4), and the outer shell (5) is located on the outer periphery of the positioning rod (4).

2. The embroidery machine according to claim 1, characterized in that, A limiting plate (25) is fixedly connected to the outer side of the outer shell (5), and the second rotating rod (23) is located between the limiting plate (25) and the outer shell (5).

3. The embroidery machine according to claim 1, characterized in that, The rotary hook (26) has a slot (33) in the middle, and a fixing block (27) is fixedly connected to the middle of the outer shell (5). A locking block (32) is fixedly connected to the outside of the fixing block (27), and the locking block (32) is engaged in the middle of the slot (33).

4. The embroidery machine according to claim 2, characterized in that, The outer shell (5) is fixedly connected to the first positioning frame (13) and the second positioning frame (14) on both sides respectively, and the two pull rods (11) are slidably connected to the middle of the first positioning frame (13) and the second positioning frame (14) respectively.

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