Thread breaking device of overedger

Abstract

The utility model discloses a thread breaking device of an overedger. The thread breaking device comprises a machine frame, a thread breaking mechanism installed on the machine frame and a first driving mechanism driving the thread breaking mechanism to move on the machine frame. The wire breaking mechanism comprises a fixing frame, an ultrasonic vibrator installed on the fixing frame, a pressing head and a driving part for driving the pressing head to be close to or away from the ultrasonic vibrator, and is characterized in that a cooling fan and a material suction barrel are further installed on the fixing frame, the cooling fan is arranged on the side of the ultrasonic vibrator, and the material suction barrel is arranged on the side of the ultrasonic vibrator. The cooling fan is arranged right opposite to the ultrasonic vibrator, the top of the material suction barrel is arranged close to the top of the ultrasonic vibrator, and the bottom of the material suction barrel is connected with a material suction mechanism. According to the utility model, the wire breaking efficiency and quality are improved, the maintenance rate is reduced, the service life is prolonged, and the labor intensity of operators is also reduced.

Description

Technical Field

[0001] The utility model relates to an overlock sewing machine, in particular to a thread breaking device of the overlock sewing machine. Background Art

[0002] Towels are usually a rectangular piece of cloth structure, which is usually woven with warp and weft threads. It is a kind of cloth with good water absorption performance. During the production process, several small rectangular pieces of uniform size are evenly cut from the whole piece of cloth. The burrs of these semi-finished rectangular cloths need to be processed by a sewing machine to increase the service life and appearance of the finished towels.

[0003] After the rough edges are sewn, the thread ends need to be cut off. The conventional cutting method is mechanical cutting, that is, using a cutter to press down and cut the thread ends. However, since the thread ends are flexible structures, they may not be cut off, so they need to be trimmed manually. At the same time, during the cutting process, the sewing mechanism also needs to be paused, which will also affect the efficiency of the overlocking.

[0004] In order to solve the above technical problems, the applicant previously applied for a patent with application number: 202310108075.0, and the patent name is: a split combined ultra-fine seam device, which adopts the method of cutting and ultrasonic cutting. However, the structure still has the following shortcomings:

[0005] 1. During ultrasonic welding, the ultrasonic equipment will generate high temperature, which will affect the service life and cutting quality of the ultrasonic equipment;

[0006] 2. The thread ends during the cutting process will stick to the edge of the towel, requiring manual secondary cleaning, which is labor-intensive for operators and will also affect the aesthetics of the towel. Summary of the invention

[0007] The utility model aims to provide a thread cutting device for an overlock sewing machine. By using the structure, the cutting stability and quality of the thread ends can be improved, the thread ends can be prevented from frayed, the length of the thread ends can be controlled conveniently, and the service life of the equipment can be extended and the maintenance rate can be reduced.

[0008] To achieve the above object, the technical solution adopted by the utility model is: a thread breaking device of an overlock sewing machine, comprising a frame, a thread breaking mechanism installed on the frame, and a first driving mechanism for driving the thread breaking mechanism to move on the frame;

[0009] The wire breaking mechanism includes a fixing frame, an ultrasonic vibrator mounted on the fixing frame, a pressure head, and a driving member for driving the pressure head to approach or move away from the ultrasonic vibrator.

[0010] A cooling fan and a suction cylinder are also installed on the fixed frame. The cooling fan is arranged beside the ultrasonic vibrator and directly facing the ultrasonic vibrator. The top of the suction cylinder is arranged close to the top of the ultrasonic vibrator, and the bottom of the suction cylinder is connected to the suction mechanism.

[0011] In the above technical solution, an ultrasonic die head is provided on the output end of the top of the ultrasonic vibrator, and the driving member drives the pressure head to abut against the ultrasonic die head, or to be arranged away from the ultrasonic die head.

[0012] In the above technical solution, the fixed frame includes a bottom plate, a vertical frame and a connecting frame, the bottom rear side of the bottom plate is slidably connected to the frame, the connecting frame is arranged below the bottom plate on the front side of the frame, the vertical frame is installed on the bottom plate, and the driving member and the pressure head are installed on the vertical frame;

[0013] The connecting frame is connected to the bottom plate via a height adjusting member, the ultrasonic vibrator is mounted on the connecting frame, a through hole is provided on the bottom plate, the ultrasonic vibrator passes through the through hole and is arranged above the bottom plate, and the pressure head is arranged directly above the ultrasonic vibrator.

[0014] In the above technical solution, a mounting frame is provided on the front side of the connecting frame, the top of the mounting frame is connected to the front side of the bottom plate, and the cooling fan is installed on the mounting frame;

[0015] And / or, the suction cylinder is installed on the left side or right side of the base plate.

[0016] In the above technical solution, a vertical slide rail is provided on the fixed frame, a connecting seat is slidably provided on the vertical slide rail, the top of the pressure head is connected to the connecting seat via a buffer mechanism, and the driving member is configured to drive the connecting seat to move up and down so that the pressure head is close to or away from the ultrasonic vibrator.

[0017] In the above technical solution, the buffer mechanism includes a mounting plate and at least two connecting rods, the top of the pressure head is connected to the bottom of the mounting plate, the bottoms of multiple connecting rods are connected to the top of the mounting plate, and the top of the connecting rod is slidably connected to the connecting seat;

[0018] A limit head is provided on the top of the connecting rod, and the limit head is arranged above the connecting seat. A spring is sleeved on each connecting rod, and the two ends of the spring are respectively against the mounting plate and the connecting seat, and the spring pushes the mounting plate to move downward.

[0019] In the above technical solution, the driving member includes a motor, a belt and two pulleys, the two pulleys are arranged at an interval up and down, the pulleys are rotatably connected to the fixed frame, the belt is wound around the two pulleys, the motor is configured to drive one of the pulleys to rotate, and the connecting seat is connected to one side of the belt.

[0020] In the above technical solution, the fixing frame is further provided with a first sensor facing the vertical slide rail;

[0021] And / or, a second sensor and a third sensor are mounted on the fixing frame, the second sensor is arranged directly above the third sensor, the second sensor is arranged beside the pressure head, and the third sensor is arranged beside the ultrasonic vibrator.

[0022] In the above technical solution, the frame is provided with a first slide rail, and the bottom of the fixed frame is movably mounted on the first slide rail;

[0023] The first driving mechanism includes a first motor, a first belt and two first pulleys, the two first pulleys are arranged at intervals, and the two first pulleys are respectively arranged near the two ends of the first slide rail; the first belt is wound around the two first pulleys, the first motor is configured to drive one of the first pulleys to rotate, and the fixed frame is connected to one side of the first belt.

[0024] In the above technical solution, the frame is provided with a first slide rail, and the bottom of the fixed frame is movably mounted on the first slide rail;

[0025] The first driving mechanism includes a first motor and a first ball screw, the first ball screw is arranged parallel to the side of the first slide rail, both ends of the first ball screw are rotatably connected to the frame, the middle part of the first ball screw is connected to the fixed frame, and the first motor is configured to drive the first ball screw to rotate;

[0026] When the first ball screw rotates, it drives the fixing frame to move along the first slide rail.

[0027] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0028] 1. In the utility model, a cooling fan is arranged beside the ultrasonic vibrator, which can improve the heat dissipation efficiency of the ultrasonic vibrator, extend its service life and reduce the maintenance rate;

[0029] 2. The utility model is provided with a suction cylinder, so that in the process of cutting the thread ends, the cut thread ends can be sucked away by the suction cylinder, which can not only ensure the aesthetics of the product, but also eliminate the need for secondary cleaning of the towels, thereby reducing the labor intensity of the operators;

[0030] 3. In the utility model, the machine also moves along during the thread cutting process, so there is no need to pause the sewing action during the thread cutting process, which can effectively ensure the sewing efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the first embodiment of the present utility model;

[0032] Figure 2 yes Figure 1 Structural diagram of the interruption line mechanism;

[0033] Figure 3 It is a schematic diagram of the three-dimensional structure in the first embodiment of the utility model;

[0034] Figure 4 yes Figure 3 A partial enlarged view of the wire breaking mechanism.

[0035] Among them: 1. frame; 2. fixing frame; 3. ultrasonic vibrator; 4. pressure head; 5. cooling fan; 6. suction cylinder; 7. ultrasonic die head; 8. bottom plate; 9. vertical frame; 10. connecting frame; 11. height adjustment member; 12. through hole; 13. first slide rail; 14. mounting frame; 15. vertical slide rail; 16. connecting seat; 17. mounting plate; 18. connecting rod; 19. limit head; 20. spring; 21. motor; 22. belt; 23. pulley; 24. first sensor; 25. second sensor; 26. third sensor; 27. first motor; 28. first belt; 29. ​​first pulley. DETAILED DESCRIPTION

[0036] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0037] Example 1: See Figures 1 to 4 As shown, a thread breaking device of an overlock sewing machine comprises a frame 1, a thread breaking mechanism installed on the frame 1, and a first driving mechanism for driving the thread breaking mechanism to move on the frame;

[0038] The wire breaking mechanism includes a fixing frame 2, an ultrasonic vibrator 3 mounted on the fixing frame 2, a pressure head 4, and a driving member for driving the pressure head 4 to approach or move away from the ultrasonic vibrator 3.

[0039] A cooling fan 5 and a suction cylinder 6 are also installed on the fixing frame 2. The cooling fan 5 is arranged beside the ultrasonic vibrator 3, and the cooling fan 5 is arranged directly opposite the ultrasonic vibrator 3. The top of the suction cylinder 6 is arranged close to the top of the ultrasonic vibrator 3, and the bottom of the suction cylinder 6 is connected to a suction mechanism (the suction mechanism is not shown in the figure).

[0040] In this embodiment, in actual use, the thread breaking device will be installed on the overlock sewing machine, and it will be set at the rear end of the overlock sewing mechanism. After the edge of the fabric is sewn, the end of the thread (or the end of the seam) will be between the pressure head and the ultrasonic vibrator, and then the driving member drives the pressure head to approach the ultrasonic vibrator, and uses the ultrasonic vibrator and the pressure head to cut off the thread head or the end of the seam that needs to be cut off. At the same time, in this process, in order not to affect the subsequent sewing of the fabric and the unloading of the fabric, when the pressure head approaches the ultrasonic vibrator and the pressure head presses the end of the product between the ultrasonic vibrator for ultrasonic cutting, the first driving mechanism will also drive the thread breaking mechanism to move synchronously with the moving direction of the fabric, and the moving speed of the thread breaking mechanism will match the moving speed of the fabric. In this way, cutting is performed during the unloading process, which effectively ensures the overlock efficiency of the product, and ultrasonic cutting is adopted, the cutting quality is good, and there will be no adhesion or uncut situation. At the same time, when the ultrasonic vibrator performs ultrasonic welding, high temperature will be generated. Therefore, by setting a cooling fan, the ultrasonic vibrator can be cooled, thereby extending the service life of the ultrasonic vibrator, ensuring the stability of the ultrasonic vibrator, and at the same time, reducing the maintenance rate of the ultrasonic vibrator. Furthermore, the suction mechanism uses a vacuum cleaner or other negative pressure mechanism, which will give the suction tube negative pressure. During the cutting process, the discarded thread ends and seam waste after cutting will be sucked away by the negative pressure of the suction tube. This can prevent the discarded thread ends and other materials from falling on the wire breaking mechanism (preventing the discarded materials from affecting the subsequent cutting of the fabric by the wire breaking mechanism) and the fabric (preventing the waste materials from affecting the aesthetics of the fabric, and no manual subsequent cleaning of the waste materials is required).

[0041] See also Figures 1 to 4 As shown, an ultrasonic die head 7 is provided on the output end of the top of the ultrasonic vibrator 3 , and the driving member drives the pressure head 4 to abut against the ultrasonic die head 7 , or to be arranged away from the ultrasonic die head 7 .

[0042] Among them, the pressure head is pressed on the ultrasonic die head at the part where the fabric needs to be cut, and the fabric is cut by the ultrasonic vibrator and the die head.

[0043] See also Figures 1 to 4As shown, the fixing frame 2 includes a bottom plate 8, a vertical frame 9 and a connecting frame 10. The bottom rear side of the bottom plate 8 is slidably connected to the frame 1. The connecting frame 10 is arranged below the bottom plate 8 on the front side of the frame 1. The vertical frame 9 is installed on the bottom plate 8. The driving member and the pressure head 4 are installed on the vertical frame 9.

[0044] The connecting frame 10 is connected to the base plate 8 via a height adjusting member 11, the ultrasonic vibrator 3 is mounted on the connecting frame 10, a through hole 12 is provided on the base plate 8, the ultrasonic vibrator 3 passes through the through hole 12 and is arranged above the base plate 8, and the pressure head 4 is arranged directly above the ultrasonic vibrator 3.

[0045] The frame 1 is provided with a first slide rail 13, and the bottom of the fixed frame 2 is movably mounted on the first slide rail 13. In this embodiment, the bottom rear side of the bottom plate is slidably mounted on the first slide rail, and the first driving mechanism drives the bottom plate to move along the first slide rail, wherein, in this embodiment, the first slide rail is arranged horizontally, and the first driving mechanism drives the bottom plate to move horizontally.

[0046] At the same time, in the present embodiment, the ultrasonic vibrator is directly connected to the base plate through the connecting frame, so that after the ultrasonic vibrator has problems and does not need to be repaired or replaced, the connecting frame can be directly removed, which is convenient and quick. The top of the ultrasonic vibrator is arranged above the base plate through the through hole, and there is a spacing between the ultrasonic vibrator and the inner wall of the through hole. At the same time, the connecting frame is connected to the base plate through the height adjustment member, so that the height of the top of the ultrasonic vibrator (i.e., the ultrasonic die head) can be adjusted, which is suitable for different overlock machines and improves the scope of application. Wherein, the height adjustment member is a screw rod or a bolt, taking the bolt as an example, an upper hole is provided on the base plate, and a lower hole is provided on the connecting frame, and the bottom of the bolt passes through the upper hole and the lower hole in sequence and is located below the connecting frame, and the screw head at the top of the screw rod is against the top surface of the base plate, and the upper nut, the middle nut and the lower nut are screwed on the bolt, and the top surface of the upper nut is against the bottom surface of the base plate, and the bottom surface of the middle nut is against the top surface of the connecting frame, and the top of the lower nut is against the bottom surface of the connecting frame. When the height position of the connecting frame needs to be adjusted, loosen the middle nut and the lower nut to keep them away from the connecting frame. After adjusting the position of the connecting frame, screw the middle nut and the lower nut to make them rest on the connecting frame. In this way, the height adjustment of the connecting frame and the ultrasonic vibrator can be completed.

[0047] See also Figures 1 to 4 As shown, a mounting frame 14 is provided on the front side of the connecting frame 10, the top of the mounting frame 14 is connected to the front side of the base plate 8, and the cooling fan 5 is installed on the mounting frame 14; wherein, the mounting frame can be a plate having a hole thereon facing the ultrasonic vibrator, and the cooling fan is installed at the hole. When the cooling fan is working, the wind blown out passes through the hole and blows onto the ultrasonic vibrator to dissipate heat.

[0048] Wherein, the suction cylinder is installed on the left or right side of the bottom plate. Preferably, it is arranged at the end of the moving direction of the fabric, for example, when the fabric is transported to the left, the suction cylinder is installed on the left side of the bottom plate, and if the fabric is transported to the right, the suction cylinder is installed on the right side of the bottom plate. In this way, it can be ensured that the suction cylinder can smoothly suck away the cut waste.

[0049] See also Figures 1 to 4 As shown, the fixing frame 2 is provided with a vertical slide rail 15, and a connecting seat 16 is slidably provided on the vertical slide rail 15. The top of the pressure head 4 is connected to the connecting seat 16 via a buffer mechanism, and the driving member is configured to drive the connecting seat 16 to move up and down, so that the pressure head 4 is set close to or away from the ultrasonic vibrator 3.

[0050] Among them, the pressure head is connected to the connecting seat through a buffer mechanism, so that when the pressure head moves downward to press the fabric onto the ultrasonic die head, the pressure applied by the pressure head to the ultrasonic die head cannot be too large to cause damage to the ultrasonic die head, or due to the inertial impact force of the downward movement of the pressure head. Therefore, through the setting of the buffer mechanism, the damage of the ultrasonic die head can be prevented, and the pressing force of the pressure head on the product can be guaranteed to ensure the cutting quality.

[0051] See also Figures 1 to 4 As shown, the buffer mechanism includes a mounting plate 17 and at least two connecting rods 18, the top of the pressure head 4 is connected to the bottom of the mounting plate 17, the bottoms of the multiple connecting rods 18 are connected to the top of the mounting plate 17, and the tops of the connecting rods 18 are slidably connected to the connecting seat 16;

[0052] A limit head 19 is provided on the top of the connecting rod 18, and the limit head 19 is arranged above the connecting seat 16. A spring 20 is sleeved on each of the connecting rods 18, and the two ends of the spring 20 are respectively against the mounting plate 17 and the connecting seat 16, and the spring pushes the mounting plate to move downward.

[0053] Through the setting of the spring, after the bottom of the pressure head pushes the fabric against the ultrasonic die head, if the connecting seat is still moving downward, or due to the relationship, the ultrasonic die head will be given a downward impact force, the reaction force given to the pressure head by the fabric and the ultrasonic die head will compress the spring, and the elastic force of the spring will be used to press the pressure head onto the fabric to ensure the ultrasonic cutting quality.

[0054] See also Figure 1 , 3As shown, the driving member includes a motor 21, a belt 22 and two pulleys 23. The two pulleys 23 are arranged at an interval up and down. The pulleys 23 are rotatably connected to the fixed frame 2. The belt 22 is wound around the two pulleys 23. The motor 21 is configured to drive one of the pulleys 23 to rotate, and the connecting seat 16 is connected to one side of the belt 22.

[0055] In this embodiment, a structure of a motor, a belt and a pulley is adopted, which can drive the connecting seat to move up and down along the vertical slide rail. At the same time, the motor and the belt have high precision, ensuring high precision of the displacement distance of the connecting seat.

[0056] Of course, in the present invention, the driving member can be a cylinder, or a combination of a motor and a ball screw, or a combination of a motor and a cam structure, as long as it can drive the connecting seat and the pressure head to move up and down.

[0057] See also Figures 1 to 4 As shown, the fixing frame 2 is also provided with a first sensor 24 facing the vertical slide rail 15; the setting of the first sensor 24 can detect the upward position of the connecting seat, so that after the pressure head moves up and away from the ultrasonic die, the distance between the two groups is as short as possible, while ensuring that the fabric can pass smoothly between the pressure head and the ultrasonic die, it can also reduce the time that the pressure head is close to the ultrasonic die, thereby improving the cutting efficiency.

[0058] See also Figures 1 to 4 As shown, a second sensor 25 and a third sensor 26 are installed on the fixing frame 2. The second sensor 25 is arranged directly above the third sensor 26. The second sensor 25 is arranged beside the pressure head 4. The third sensor 26 is arranged beside the ultrasonic vibrator 3.

[0059] The second sensor and the third sensor are used to detect the thread end position of the fabric, so as to ensure the cutting quality and prevent the problem of over-cutting or under-cutting.

[0060] See also Figure 1 , 3 As shown, the first driving mechanism includes a first motor 27, a first belt 28 and two first pulleys 29, the two first pulleys 29 are arranged at intervals, and the two first pulleys 29 are respectively arranged near the two ends of the first slide rail 13; the first belt 28 is wound around the two first pulleys 29, the first motor 27 is configured to drive one of the first pulleys 29 to rotate, and the fixed frame 2 is connected to one side of the first belt 28.

[0061] In this embodiment, the first motor drives a pulley to rotate, which drives the first belt to rotate. When the first belt rotates, the fixed frame is pulled to move along the first slide rail, so that the fabric thread ends are cut along with the fabric, thereby improving the cutting efficiency. At the same time, in this embodiment, one side of the first belt is connected to the rear side of the bottom plate.

[0062] Embodiment 2: A thread breaking device for an overlock sewing machine, the structure of which is basically similar to that of embodiment 1, except that: a first slide rail is provided on the frame, and the bottom of the fixed frame is movably mounted on the first slide rail;

[0063] The first driving mechanism includes a first motor and a first ball screw, the first ball screw is arranged parallel to the side of the first slide rail, both ends of the first ball screw are rotatably connected to the frame, the middle part of the first ball screw is connected to the fixed frame, and the first motor is configured to drive the first ball screw to rotate;

[0064] When the first ball screw rotates, it drives the fixing frame to move along the first slide rail.

[0065] In this embodiment, a motor and a ball screw are used to drive the wire breaking mechanism to move along the first slide rail, which is different from the belt transmission structure, but has strong stability.

[0066] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0067] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A thread breaking device for an overlock sewing machine, comprising a frame, a thread breaking mechanism mounted on the frame, and a first driving mechanism for driving the thread breaking mechanism to move on the frame; The wire breaking mechanism comprises a fixing frame, an ultrasonic vibrator mounted on the fixing frame, a pressure head, and a driving member for driving the pressure head to approach or move away from the ultrasonic vibrator, and is characterized in that: A cooling fan and a suction cylinder are also installed on the fixed frame. The cooling fan is arranged beside the ultrasonic vibrator and directly facing the ultrasonic vibrator. The top of the suction cylinder is arranged close to the top of the ultrasonic vibrator, and the bottom of the suction cylinder is connected to the suction mechanism.

2. The thread breaking device of the overlock sewing machine according to claim 1, characterized in that: An ultrasonic die head is arranged on the output end of the top of the ultrasonic vibrator, and the driving member drives the pressure head to abut against the ultrasonic die head, or to be arranged away from the ultrasonic die head.

3. The thread breaking device of the overlock sewing machine according to claim 1, characterized in that: The fixing frame includes a bottom plate, a vertical frame and a connecting frame, the bottom rear side of the bottom plate is slidably connected to the frame, the connecting frame is arranged below the bottom plate at the front side of the frame, the vertical frame is installed on the bottom plate, and the driving member and the pressure head are installed on the vertical frame; The connecting frame is connected to the bottom plate via a height adjusting member, the ultrasonic vibrator is mounted on the connecting frame, a through hole is provided on the bottom plate, the ultrasonic vibrator passes through the through hole and is arranged above the bottom plate, and the pressure head is arranged directly above the ultrasonic vibrator.

4. The thread breaking device of the overlock sewing machine according to claim 3, characterized in that: A mounting frame is provided on the front side of the connecting frame, the top of the mounting frame is connected to the front side of the bottom plate, and the cooling fan is installed on the mounting frame; And / or, the suction cylinder is installed on the left side or right side of the base plate.

5. The thread breaking device of the overlock sewing machine according to claim 1, characterized in that: The fixing frame is provided with a vertical slide rail, a connecting seat is slidably provided on the vertical slide rail, the top of the pressure head is connected to the connecting seat via a buffer mechanism, and the driving member is configured to drive the connecting seat to move up and down so that the pressure head is close to or away from the ultrasonic vibrator.

6. The thread breaking device of the overlock sewing machine according to claim 5, characterized in that: The buffer mechanism includes a mounting plate and at least two connecting rods, the top of the pressure head is connected to the bottom of the mounting plate, the bottoms of the multiple connecting rods are connected to the top of the mounting plate, and the top of the connecting rod is slidably connected to the connecting seat; A limit head is provided on the top of the connecting rod, and the limit head is arranged above the connecting seat. A spring is sleeved on each connecting rod, and the two ends of the spring are respectively against the mounting plate and the connecting seat, and the spring pushes the mounting plate to move downward.

7. The thread breaking device of the overlock sewing machine according to claim 5, characterized in that: The driving member includes a motor, a belt and two pulleys, the two pulleys are arranged at an interval up and down, the pulleys are rotatably connected to the fixing frame, the belt is wound around the two pulleys, the motor is configured to drive one of the pulleys to rotate, and the connecting seat is connected to one side of the belt.

8. The thread breaking device of the overlock sewing machine according to claim 5, characterized in that: The fixing frame is also provided with a first sensor facing the vertical slide rail; And / or, a second sensor and a third sensor are mounted on the fixing frame, the second sensor is arranged directly above the third sensor, the second sensor is arranged beside the pressure head, and the third sensor is arranged beside the ultrasonic vibrator.

9. The thread breaking device of the overlock sewing machine according to claim 1, characterized in that: The frame is provided with a first slide rail, and the bottom of the fixed frame is movably mounted on the first slide rail; The first driving mechanism includes a first motor, a first belt and two first pulleys, the two first pulleys are arranged at intervals, and the two first pulleys are respectively arranged near the two ends of the first slide rail; the first belt is wound around the two first pulleys, the first motor is configured to drive one of the first pulleys to rotate, and the fixed frame is connected to one side of the first belt.

10. The thread breaking device of the overlock sewing machine according to claim 1, characterized in that: The frame is provided with a first slide rail, and the bottom of the fixed frame is movably mounted on the first slide rail; The first driving mechanism includes a first motor and a first ball screw, the first ball screw is arranged parallel to the side of the first slide rail, both ends of the first ball screw are rotatably connected to the frame, the middle part of the first ball screw is connected to the fixed frame, and the first motor is configured to drive the first ball screw to rotate; When the first ball screw rotates, it drives the fixing frame to move along the first slide rail.

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