Improved thread trimming mechanism of sewing machine

Abstract

The utility model relates to the technical field of sewing equipment, in particular to an improved thread trimming mechanism of a sewing machine, which comprises a thread trimming structure, and the thread trimming structure comprises a movable cutter unit and a fixed cutter matched with the movable cutter unit for use; the movable cutter unit comprises a driving part, an annular supporting seat, a mounting part integrally formed with the annular supporting seat and a cutter, the cutter is mounted on the mounting part through a fastener, a first blade part is arranged on the cutter, and a second blade part meshed with the first blade part is arranged on the fixed cutter; the driving piece drives the annular supporting base to rotate so as to drive the first blade part of the cutter to approach the second blade part of the fixed cutter to cut off the thread residues. According to the thread trimming structure, the complex structure of a traditional thread trimming mechanism is simplified, and the manufacturing and maintenance cost is reduced. Meanwhile, the conveying mechanism is composed of a first gear, a second gear and a conveying belt, belt conveying transmits power through friction or synchronous gear meshing, instant impact force can be effectively reduced, and the problems of vibration and noise caused by rigid transmission are solved.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and in particular discloses an improved thread-cutting mechanism for sewing machines. Background Technology

[0002] Manual thread cutting is not only time-consuming and labor-intensive, but it can also damage the neatness of the sewing thread and the smoothness of the operation, limiting the improvement of production efficiency. With technological advancements, modern sewing equipment is gradually moving towards automation and intelligence. Current electric thread cutting devices on the market rely on a motor-driven transmission component to drive the cutter and stationary blade to accurately cut the thread. However, the traditional construction of these devices often faces challenges: the complex mechanical transmission system is prone to wear and loosening, which in turn affects the accuracy of thread cutting and shortens the service life of the equipment; at the same time, the mechanical operation is noisy and unstable. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an improved thread-cutting mechanism for sewing machines.

[0004] To achieve the above objectives, this utility model provides an improved thread-cutting mechanism for a sewing machine, comprising a thread-cutting structure. The thread-cutting structure includes a moving blade unit and a fixed blade that cooperates with the moving blade unit. The moving blade unit includes a driving component, an annular support base, a mounting portion integrally formed with the annular support base, and a cutting blade. The cutting blade is mounted on the mounting portion via fasteners. The cutting blade has a first cutting edge, and the fixed blade has a second cutting edge that engages with the first cutting edge. The driving component drives the annular support base to rotate, thereby moving the first cutting edge of the cutting blade closer to the second cutting edge of the fixed blade to cut the thread end.

[0005] The moving blade unit also includes a conveying mechanism, a first rod, and a second rod. The conveying mechanism is connected to the output end of the drive component. The end of the conveying mechanism away from the drive component is fixedly connected to the first rod. The first rod and the second rod are hinged together via a connector. An annular support seat is fixedly installed on the second rod. The drive component drives the conveying mechanism to rotate, thereby causing the first rod to rotate. The rotation of the first rod causes the annular support seat on the second rod to rotate. The cutter on the annular support seat moves closer to the fixed blade via the rotation of the second rod to cut the wire end.

[0006] The driving component is a stepper motor or a servo motor. The driving component is set with a rotation degree by the control unit to drive the cutter to move closer to or away from the fixed blade to achieve the wire cutting operation.

[0007] The transmission mechanism includes a first gear, a second gear, and a transmission belt. The transmission belt is fitted onto the first gear and the second gear. The first gear is connected to the output end of the drive unit. The drive unit drives the first gear to rotate. The rotation of the first gear drives the second gear to rotate through the transmission belt, thereby realizing the transmission of power.

[0008] The mounting part is provided with a limiting hole, and the cutter is provided with a threaded hole that matches the limiting hole. External fasteners pass through the threaded hole on the cutter and the limiting hole on the mounting part in sequence to install the cutter on the annular support.

[0009] The wire-cutting mechanism also includes a support base, and the wire-cutting structures are all mounted on the support base.

[0010] The bottom of the support base is equipped with shock-absorbing pads, which are located under the four corners of the support base. Each corner is equipped with one shock-absorbing pad, and the vibration generated by the wire shearing mechanism is absorbed by the evenly distributed support points.

[0011] The cutter is equipped with an anti-adhesion coating, which is uniformly applied to the cutter to reduce the adhesion of thread ends and fabric residue to the cutter during sewing. The anti-adhesion coating is made of polytetrafluoroethylene (PTFE) or other polymer materials with a low coefficient of friction, and is uniformly applied to the cutter surface using plasma spraying or electroplating technology. The coating thickness is 0.01-0.05 mm to ensure good wear resistance without affecting the cutter's sharpness, effectively reducing the adhesion of thread ends and fabric residue to the cutter surface.

[0012] The thread-cutting mechanism also includes a cleaning device for adsorbing thread ends. The cleaning device is mounted on a support base and includes an air pump and a suction tube. One end of the suction tube is connected to the air pump's output, and the end of the suction tube away from the air pump is a suction nozzle. The suction nozzle is aligned with the cutter to adsorb thread ends and fabric residue. The suction tube is made of highly wear-resistant rubber, and its inner wall is treated with anti-static agents to ensure that it is not affected by static electricity buildup during prolonged use. The suction nozzle has an adjustable angle design, automatically aligning with the cleaning area according to the cutter position.

[0013] The cleaning device also includes a lint collection box. The lint collection box is made of transparent material, making it easy for operators to observe its volume. A removable filter screen is provided at the bottom of the collection box to prevent debris from clogging the air pump outlet.

[0014] This utility model provides an improved thread-cutting mechanism for sewing machines, employing an innovative design concept that combines electronic control technology with mechanical transmission. This significantly improves the efficiency, stability, and cleanliness of thread-cutting operations. In practice, the moving blade unit includes a stepper motor or servo motor as a drive component. The rotation angle is precisely set by the control unit to drive the movement of the moving blade unit. This drive component is connected to a transmission mechanism, which consists of a first gear, a second gear, and a transmission belt. The first gear is connected to the output end of the drive component, and the transmission belt drives the second gear to rotate, thereby transmitting power and driving the first rod to rotate. The rotation of the first rod causes the annular support seat on the second rod to rotate, enabling precise thread cutting through the relative motion between the cutter and the fixed blade. The belt transmission transmits power through friction or synchronous gear meshing, effectively reducing instantaneous impact and avoiding vibration and noise problems caused by rigid transmission. During operation, the belt can absorb some mechanical vibration, making it suitable for equipment requiring stable operation, such as the thread-cutting mechanism of a sewing machine. In case of overload or accident, the belt can automatically protect the equipment through slippage, preventing damage to critical components due to forced transmission.

[0015] The cutter is coated with an anti-adhesion coating, which is evenly applied to the cutter surface. This effectively reduces the adhesion of thread ends and fabric residue to the cutter during sewing, thereby reducing blade dulling caused by these deposits and extending the cutter's lifespan. The cutter is secured by the limiting holes and threaded holes on the mounting section, ensuring the cutter's stability and precise cutting operation.

[0016] Furthermore, this invention incorporates a cleaning device to ensure hygiene and efficiency during operation. The cleaning device includes an air pump and a suction pipe. One end of the suction pipe is connected to the air pump, and the other end is equipped with a suction nozzle. The nozzle is precisely aligned with the cutting area, and the suction force of the air pump adsorbs and guides the thread ends and fabric residue generated during the cutting process into the collection system. The cleaning device also includes a thread collection box, further improving the recycling efficiency of residues, preventing waste spillage, and ensuring a clean working environment and efficient equipment operation.

[0017] To further enhance equipment stability and reduce the impact of external vibrations, anti-vibration pads are installed at the bottom of the support base, effectively reducing the interference of vibrations caused by machine movement on the equipment and operating environment. In addition, the support base provides a stable support platform, ensuring the alignment accuracy between the moving and stationary blades and preventing shearing errors caused by vibration.

[0018] The beneficial effects of this invention are as follows: This invention provides a highly efficient and stable thread-cutting mechanism for sewing machines by combining electronic control technology, belt drive, and an innovative mechanical structure. Its principle is based on a stepper motor or servo motor driving the moving blade unit, utilizing belt drive in the transmission mechanism to achieve smooth power transmission, driving the precise coordination of the cutter and stationary blade to cut the thread. The belt drive structure effectively absorbs mechanical vibration, reduces noise, and protects the equipment through slippage under overload conditions, improving system reliability. Furthermore, the cutter surface is coated with an anti-adhesion coating, effectively preventing thread ends and fabric residue from adhering, extending the cutter's service life. A cleaning device efficiently adsorbs and recovers residue generated during the thread-cutting process, maintaining a clean working environment. The support base is equipped with shock-absorbing pads to further reduce the impact of vibration on operational accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the moving blade unit and the fixed blade of this utility model;

[0021] Figure 3 This is a schematic diagram of the moving blade unit of this utility model;

[0022] Figure 4 This is a schematic diagram of the cleaning device of this utility model.

[0023] The reference numerals in the figures include:

[0024] 1. Wire cutting structure; 2. Moving blade unit; 3. Fixed blade; 4. Driving component; 5. Annular support base; 6. Mounting part; 7. Cutting blade; 8. First cutting edge; 9. Second cutting edge; 11. Conveying mechanism; 12. First rod; 13. Second rod; 14. First gear; 15. Second gear; 16. Conveyor belt; 17. Limiting hole; 18. Support base; 19. Anti-vibration pad; 21. Cleaning device; 22. Air pump; 23. Suction pipe; 24. Suction nozzle; 25. Wire end collection box. Detailed Implementation

[0025] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0026] Please see Figures 1 to 4As shown, an improved thread-cutting mechanism for a sewing machine according to this utility model includes a thread-cutting structure 1. The thread-cutting structure 1 includes a moving blade unit 2 and a fixed blade 3 that works in conjunction with the moving blade unit 2. The moving blade unit 2 includes a driving member 4, an annular support seat 5, a mounting part 6 integrally formed with the annular support seat 5, and a cutter 7. The cutter 7 is mounted on the mounting part 6 via fasteners. The cutter 7 has a first cutting edge 8, and the fixed blade 3 has a second cutting edge 9 that engages with the first cutting edge 8. The driving member 4 drives the annular support seat 5 to rotate, thereby moving the first cutting edge 8 of the cutter 7 closer to the second cutting edge 9 of the fixed blade 3 to cut the thread end.

[0027] The moving blade unit 2 also includes a conveying mechanism 11, a first rod 12, and a second rod 13. The conveying mechanism 11 is connected to the output end of the driving member 4. The end of the conveying mechanism 11 away from the driving member 4 is fixedly connected to the first rod 12. The first rod 12 and the second rod 13 are hinged together via a connector. The annular support seat 5 is fixedly installed on the second rod 13. The driving member 4 drives the conveying mechanism 11 to rotate, thereby causing the first rod 12 to rotate. The rotation of the first rod 12 causes the annular support seat 5 on the second rod 13 to rotate. The cutter 7 on the annular support seat 5 approaches the fixed blade 3 through the rotation of the second rod 13 to cut the thread end.

[0028] The driving component 4 is a stepper motor or a servo motor. The driving component 4 is set with a rotation degree by the control unit to drive the cutter 7 to move closer to or further away from the fixed blade 3 to achieve the wire cutting operation.

[0029] The conveying mechanism 11 includes a first gear 14, a second gear 15, and a conveyor belt 16. The conveyor belt 16 is sleeved on the first gear 14 and the second gear 15. The first gear 14 is connected to the output end of the drive member 4. The drive member 4 drives the first gear 14 to rotate. The rotation of the first gear 14 drives the second gear 15 to rotate through the conveyor belt 16, thereby realizing the transmission of power.

[0030] The mounting part 6 is provided with a limiting hole 17, and the cutter 7 is provided with a threaded hole that matches the limiting hole 17. External fasteners pass through the threaded hole on the cutter 7 and the limiting hole 17 on the mounting part 6 in sequence to install the cutter 7 on the annular support 5.

[0031] The wire-cutting mechanism also includes a support base 18, and the wire-cutting structures 1 are all mounted on the support base 18.

[0032] The bottom of the support base 18 is provided with shock-absorbing pads 19, which are located below the four corners of the support base 18. Each corner is equipped with one shock-absorbing pad 19, which absorbs the vibration generated by the wire shearing mechanism during operation through the evenly distributed support points.

[0033] The cutter 7 is coated with an anti-adhesion coating, which is uniformly applied to the cutter 7 to reduce the adhesion of thread ends and fabric residue to the cutter 7 during the sewing process. The anti-adhesion coating is made of polytetrafluoroethylene (PTFE) or other polymer materials with a low coefficient of friction, and is uniformly applied to the surface of the cutter 7 using plasma spraying or electroplating technology. The coating thickness is 0.01-0.05 mm to ensure good wear resistance without affecting the sharpness of the cutter 7, effectively reducing the adhesion of thread ends and fabric residue to the surface of the cutter 7.

[0034] The thread-cutting mechanism also includes a cleaning device 21 for adsorbing thread ends. The cleaning device 21 is mounted on the support base 18. The cleaning device 21 includes an air pump 22 and a suction pipe 23. One end of the suction pipe 23 is connected to the output end of the air pump 22, and the end of the suction pipe 23 away from the air pump 22 is a suction nozzle 24. The suction nozzle 24 is aligned with the cutter 7 to adsorb thread ends and fabric residue. The suction pipe 23 is made of highly wear-resistant rubber, and its inner wall is treated with anti-static agents to ensure that it is not affected by static electricity buildup during long-term use. The suction nozzle 24 has an adjustable angle design, allowing it to automatically align with the cleaning area according to the position of the cutter 7.

[0035] The cleaning device 21 also includes a lint collection box 25. The lint collection box 25 is made of transparent material, making it easy for operators to observe its volume. A removable filter screen is provided at the bottom of the collection box to prevent debris from clogging the air outlet of the air pump 22.

[0036] This utility model provides an improved thread-cutting mechanism for sewing machines, employing an innovative design concept that combines electronic control technology with mechanical transmission. This significantly improves the efficiency, stability, and cleanliness of thread-cutting operations. In specific implementation, the moving blade unit 2 includes a stepper motor or servo motor as a drive component 4. The rotation angle is precisely set by the control unit to drive the movement of the moving blade unit 2. This drive component 4 is connected to the transmission mechanism 11, which consists of a first gear 14, a second gear 15, and a transmission belt 16. The first gear 14 is connected to the output end of the drive component 4, and the transmission belt 16 drives the second gear 15 to rotate, thereby transmitting power and driving the first rod 12 to rotate. The rotation of the first rod 12 causes the annular support seat 5 on the second rod 13 to rotate, enabling precise thread cutting through the relative movement between the cutter 7 and the fixed blade 3. The belt transmission transmits power through friction or synchronous gear meshing, effectively reducing instantaneous impact and avoiding vibration and noise problems caused by rigid transmission. During operation, the belt can absorb some mechanical vibration, making it suitable for equipment requiring stable operation, such as the thread-cutting mechanism of a sewing machine. In case of overload or accident, the belt can automatically protect the equipment by slipping, preventing damage to critical components due to forced transmission.

[0037] The cutter 7 is coated with an anti-adhesion coating, which is evenly applied to the surface of the cutter 7. This effectively reduces the adhesion of thread ends and fabric residue to the cutter 7 during the sewing process, thereby reducing the problem of blade dulling caused by the residue and extending the service life of the cutter 7. The cutter 7 is installed and secured to the threaded hole via the limiting hole 17 on the mounting part 6, ensuring the stability of the cutter 7 and precise cutting operation.

[0038] Furthermore, this invention incorporates a cleaning device 21 to ensure hygiene and efficiency during operation. The cleaning device 21 includes an air pump 22 and a suction pipe 23. One end of the suction pipe 23 is connected to the air pump 22, and the other end is equipped with a suction nozzle 24. The suction nozzle 24 is precisely aligned with the area of ​​the cutter 7, and the suction force of the air pump 22 adsorbs and guides the thread ends and fabric residue generated during the cutting process into the collection system. The cleaning device 21 also includes a thread end collection box 25, further improving the efficiency of residue recovery, preventing waste spillage, and ensuring a clean working environment and efficient equipment operation.

[0039] To further enhance equipment stability and reduce the impact of external vibrations, a shock-absorbing pad 19 is installed at the bottom of the support base 18, which can effectively reduce the interference of vibrations caused by machine movement on the equipment and operating environment. In addition, the support base 18 provides a stable support platform to ensure the docking accuracy between the moving blade unit 2 and the fixed blade 3, and avoid shearing errors caused by vibration.

[0040] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An improved thread-cutting mechanism for a sewing machine, characterized in that: The device includes a wire cutting structure (1), which includes a moving blade unit (2) and a fixed blade (3) used in conjunction with the moving blade unit (2). The moving blade unit (2) includes a driving member (4), an annular support base (5), a mounting part (6) integrally formed with the annular support base (5), and a cutter (7). The cutter (7) is mounted on the mounting part (6) via fasteners. The cutter (7) is provided with a first cutting edge (8), and the fixed blade (3) is provided with a second cutting edge (9) that engages with the first cutting edge (8). The driving member (4) drives the annular support base (5) to rotate, thereby driving the first cutting edge (8) of the cutter (7) to move closer to the second cutting edge (9) of the fixed blade (3) to cut the wire end.

2. The improved thread-cutting mechanism for a sewing machine according to claim 1, characterized in that: The moving blade unit (2) also includes a conveying mechanism (11), a first rod (12) and a second rod (13). The conveying mechanism (11) is connected to the output end of the driving member (4). The end of the conveying mechanism (11) away from the driving member (4) is fixedly connected to the first rod (12). The first rod (12) and the second rod (13) are hinged together via a connector. The annular support seat (5) is fixedly installed on the second rod (13). The driving member (4) drives the conveying mechanism (11) to rotate, thereby driving the first rod (12) to rotate. The rotation of the first rod (12) drives the annular support seat (5) on the second rod (13) to rotate. The cutter (7) on the annular support seat (5) approaches the fixed blade (3) via the rotation of the second rod (13) to cut the wire end.

3. The improved thread-cutting mechanism for a sewing machine according to claim 1, characterized in that: The drive unit (4) is a stepper motor or a servo motor. The drive unit (4) drives the cutter (7) to move closer to or further away from the fixed blade (3) by setting the rotation degree via the control unit to achieve the wire cutting operation.

4. The improved thread-cutting mechanism for a sewing machine according to claim 2, characterized in that: The transmission mechanism (11) includes a first gear (14), a second gear (15), and a transmission belt (16). The transmission belt (16) is sleeved on the first gear (14) and the second gear (15). The first gear (14) is connected to the output end of the drive unit (4). The drive unit (4) drives the first gear (14) to rotate. The rotation of the first gear (14) drives the second gear (15) to rotate through the transmission belt (16), thereby realizing the transmission of power.

5. The improved thread-cutting mechanism for a sewing machine according to claim 1, characterized in that: The mounting part (6) is provided with a limiting hole (17), and the cutter (7) is provided with a threaded hole that matches the limiting hole (17). External fasteners pass through the threaded hole on the cutter (7) and the limiting hole (17) on the mounting part (6) in sequence to install the cutter (7) on the annular support (5).

6. The improved thread-cutting mechanism for a sewing machine according to claim 1, characterized in that: The wire-cutting mechanism also includes a support base (18), and the wire-cutting structure (1) is set on the support base (18).

7. An improved thread-cutting mechanism for a sewing machine according to claim 6, characterized in that: The bottom of the support base (18) is provided with shock-absorbing pads (19), which are located below the four corners of the support base (18).

8. The improved thread-cutting mechanism for a sewing machine according to claim 1, characterized in that: The cutter (7) is provided with an anti-adhesion coating. The anti-adhesion coating is uniformly applied to the cutter (7) to reduce the adhesion of thread ends and fabric residue to the cutter (7) during the sewing process.

9. An improved thread-cutting mechanism for a sewing machine according to claim 6, characterized in that: The thread cutting mechanism also includes a cleaning device (21) for adsorbing thread ends. The cleaning device (21) is mounted on a support base (18). The cleaning device (21) includes an air pump (22) and an air suction pipe (23). One end of the air suction pipe (23) is connected to the output end of the air pump (22), and the end of the air suction pipe (23) away from the air pump (22) is a suction nozzle (24). The suction nozzle (24) is aligned with the cutter (7) to adsorb thread ends and fabric residue.

10. An improved thread-cutting mechanism for a sewing machine according to claim 9, characterized in that: The cleaning device (21) also includes a lint collection box (25).

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