Thread trimming assembly

Abstract

The utility model provides a thread trimming assembly, and belongs to the technical field of textile. The technical problems that an existing thread trimming device is complex in structure and cannot meet the production requirement of small fabric are solved. The thread trimming assembly comprises a thread trimming seat, a thread trimming assembly is arranged on the thread trimming seat, the thread trimming assembly comprises two cutter bodies which are hinged through a hinge pin, and the thread trimming assembly is characterized in that strip-shaped opening and closing guide grooves are formed in the two cutter bodies; an opening and closing sliding pin which can slide in the length direction so as to enable the blade ends of the two cutter bodies to oppositely rotate around the hinge pin is arranged in the two opening and closing guide grooves in a penetrating mode, when the opening and closing sliding pin is located at one ends of the two opening and closing guide grooves, the axes of the two opening and closing guide grooves intersect at one point, and the opening and closing sliding pin is connected with a linear driving mechanism. The utility model has the advantages of simple structure and long service life, is not easy to damage, has anti-wear design, and can better adapt to the production requirements of small fabrics.

Description

Technical Field

[0001] The utility model belongs to the technical field of textiles and relates to a sewing device, in particular to a thread trimming assembly. Background Art

[0002] The thread trimmer assembly is the component in the sewing mechanism that cuts the yarn, ensuring smooth yarn replacement and continuous production. Conventional thread trimmers are complex and more suitable for the production of large fabrics. They are not suitable for the short weaving times, fast throughput, and precise shearing required for small fabrics. This has led to extensive research and various solutions.

[0003] For example, a Chinese patent document discloses a scissor assembly with an integrated hosiery machine sewing mechanism [Application Number: 202321808699.5]. The assembly comprises a mounting bracket, a lifting cylinder secured to the mounting bracket, a trimming cylinder mounted at the output end of the lifting cylinder, a return spring positioned between the bottom end of the trimming cylinder and the side wall of the lifting cylinder, a pair of scissors mounted on the trimming cylinder, and an air intake elbow. The lifting cylinder controls the shears to the desired position, and the trimming cylinder then controls the shears to perform the trimming operation. This utility model automatically cuts the yarn, reducing labor costs.

[0004] Although the above solution can meet the production needs of small fabrics to a certain extent, the overall structure is still relatively complex and prone to failure. Summary of the Invention

[0005] The purpose of the utility model is to provide a durable and simple-structured thread trimmer assembly in response to the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: the present thread trimmer assembly includes a thread trimmer seat, a thread trimmer assembly is provided on the thread trimmer seat, and the thread trimmer assembly includes two knife bodies hingedly connected by a hinge pin, and is characterized in that the two knife bodies are provided with a strip-shaped opening and closing guide groove, and an opening and closing slide pin is passed through the two opening and closing guide grooves, which can slide along the length direction so that the blade ends of the two knife bodies rotate toward each other around the hinge pin, and when the opening and closing slide pin is located at one end of the two opening and closing guide grooves, the axes of the two opening and closing guide grooves intersect at one point, and the opening and closing slide pin is connected to the linear drive mechanism.

[0007] The opening and closing slide pin in the opening and closing guide groove reciprocates under the drive of the linear drive mechanism, so that the intersection of the axes of the two opening and closing guide grooves changes with the movement of the opening and closing slide pin, thereby driving the two blades hinged by the hinge pin to open and close and cut. The shearing of the blade can be achieved simply by using the linear motion of the opening and closing slide pin as a guide. The compact and simple design can improve the durability of the structure and avoid malfunctions.

[0008] In the aforementioned thread trimmer assembly, the linear drive mechanism includes a guide rod connected to an opening and closing slide pin, a guide assembly disposed between the guide rod and the thread trimmer seat, one end of the guide rod being connected to the linear actuator, and a limited displacement assembly disposed between the guide rod and the thread trimmer assembly, configured to preemptively move the two blades before the guide rod drives the opening and closing slide pin along the length of the opening and closing guide slot. The guide rod's connection to the opening and closing slide pin ensures the stability and accuracy of the opening and closing motion, preventing poor thread trimming due to unstable movement. The limited displacement assembly preemptively drives the two blades, allowing them to extend before cutting.

[0009] In the aforementioned thread trimming assembly, the limited displacement component includes a strip-shaped advance / retract movement limit slot provided on the thread trimming seat, the central axis of which is parallel to the guide rod. The end of the hinge pin is provided in the advance / retract movement limit slot. A front push-on protrusion is provided on any one of the blade bodies. The guide rod is provided with an elastic touch unit that abuts against the front push-on protrusion. When the end of the hinge pin abuts against the end of the advance / retract movement limit slot in the direction of travel and the resistance encountered by the elastic touch unit is greater than a preset value, the elastic touch unit moves from one side of the front push-on protrusion to the other. The design of the limited displacement component ensures that the blade body undergoes a certain pre-displacement before the opening and closing slide pin moves. This allows for more precise control of the final position of the blade body, thereby improving the accuracy of thread trimming. Furthermore, the elastic touch unit can automatically adjust its position when encountering excessive resistance, thereby protecting the mechanism from damage caused by collisions.

[0010] In the aforementioned thread trimmer assembly, the elastic contact unit includes a contact body disposed within a lifting guide slot and capable of moving along its length. An elastic component is disposed between the contact body and the guide rod. The elastic component guides and supports the contact body's movement within the lifting guide slot, ensuring its stability during movement.

[0011] In the above-mentioned wire trimming assembly, a sliding pin bracket is provided on the guide rod, the end of the opening and closing sliding pin is arranged on the sliding pin bracket, the lifting guide groove is provided on the sliding pin bracket, and the elastic component is provided between the touch body and the sliding pin bracket. The sliding pin bracket includes a concave main body, the two ends of the concave main body are fixed to the guide rod, and a sliding pin extension mounting plate is provided at the bottom of the front end of the concave main body, and the sliding pin extension mounting plate is connected to the concave main body as a whole. The end of the opening and closing sliding pin is arranged on the sliding pin extension mounting plate. The sliding pin bracket is fixed to the guide rod through the two ends of the concave main body. This fixing method makes the sliding pin bracket more stable and less likely to shake, thereby ensuring the stability of the opening and closing sliding pin during movement. In addition, the integrated sliding pin bracket is connected to the elastic touch unit while connecting the opening and closing sliding pin, ensuring the linkage between the components while making the structure more concise.

[0012] In the aforementioned thread trimmer assembly, the elastic component is a spring or a return torsion spring, and the contact body is a roller. The roller, as the contact body, has a smoother rolling motion than a sliding motion, which can reduce wear caused by friction and extend the service life of the thread trimmer assembly.

[0013] In the aforementioned thread trimmer assembly, the end of the opening and closing slide pin is positioned within the opening and closing guide slot of the thread trimmer seat. This slot ensures that the two blades maintain a constant position relative to the thread trimmer seat. This slot design allows the opening and closing slide pin to open and close more smoothly, ensuring accuracy and stability.

[0014] In the aforementioned thread trimmer assembly, the guide assembly includes a front guide seat and a rear guide seat. The guide rod is inserted into the front and rear guide holes of the front and rear guide seats, respectively. The front and rear guide holes are arranged concentrically. This concentric arrangement of the guide holes ensures that the guide rod maintains a straight line, reducing errors caused by shaking and improving cutting accuracy.

[0015] In the aforementioned thread trimmer assembly, wear-resistant bushings are provided in both the front and rear guide holes. The provision of the wear-resistant bushings effectively reduces direct friction between the guide rod and the front and rear guide holes, thereby improving the wear resistance of the entire guide assembly and extending its service life.

[0016] In the aforementioned wire trimmer assembly, the blade comprises a cutter head and a blade body. The cutter head partially extends beyond the trimmer base, the hinge pin is located at the rear end of the blade body, and the opening and closing slide pin is located within the blade body between the cutter head and the hinge pin. The hinge pin, located at the rear end of the blade body, allows the two blades to rotate toward each other about the hinge pin, thereby completing the opening and closing motion. The cutter head partially extends beyond the trimmer base, allowing for direct contact with the wire being cut.

[0017] Compared with existing technologies, the advantages of this thread trimmer assembly are: 1. Simple structure, not easy to damage. 2. Multiple unique anti-wear features, long service life. 3. Compact design, more suitable for small fabric production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram provided by the utility model.

[0019] Figure 2 The utility model provides Figure 1 Enlarge the structural diagram at point A.

[0020] In the figure, the thread trimmer seat 1, the opening and closing guide limit groove 11, the thread trimmer assembly 2, the hinge pin 21, the cutter body 22, the blade 221, the cutter head 222, the blade 223, the opening and closing guide groove 23, the opening and closing sliding pin 24, the linear drive mechanism 3, the guide rod 31, the linear drive 32, the sliding pin bracket 33, the concave body 331, the sliding pin extension mounting plate 332, the guide assembly 4, the front guide seat 41, the rear guide seat 42, the front guide hole 43, the rear guide hole 44, the wear-resistant bushing 45, the limited displacement assembly 5, the advance and retreat limit groove 51, the front push protrusion 52, the elastic touch unit 53, the touch body 531, the lifting guide groove 532, the elastic assembly 533, the reset torsion spring 534, and the roller 535. DETAILED DESCRIPTION

[0021] like Figure 1 and 2 As shown, the present invention relates to a thread trimmer assembly, comprising a thread trimmer seat 1, on which a thread trimmer assembly 2 is provided, and the thread trimmer assembly 2 comprises two blades 22 hingedly connected by a hinge pin 21, and is characterized in that a strip-shaped opening and closing guide groove 23 is provided on each of the two blades 22, and an opening and closing slide pin 24 is provided in the two opening and closing guide grooves 23, which can slide along the length direction so that the blades 221 ends of the two blades 22 rotate toward each other around the hinge pin 21, and when the opening and closing slide pin 24 is located at one end of the two opening and closing guide grooves 23, the axes of the two opening and closing guide grooves 23 intersect at one point, and the opening and closing slide pin 24 is connected to the linear drive mechanism 3.

[0022] In this embodiment, the opening and closing slide pin 24 set in the opening and closing guide groove 23 is used to reciprocate linearly, driving the two blade bodies 22 to open and close around the hinge pin 21 to achieve shearing. The opening and closing guide grooves 23 of the two blade bodies 22 are not parallel. The opening and closing guide groove 23 of the blade body 22 located at the upper end is inclined upward, and the opening and closing guide groove 23 of the blade body 22 located at the lower end is inclined downward. The position of the opening and closing slide pin 24 is the intersection of the opening and closing guide grooves 23 of the two blade bodies 22. When the opening and closing slide pin 24 moves, the intersection of the opening and closing guide grooves 23 of the two blade bodies 22 moves accordingly, thereby driving the two blade bodies 22 to open and close to achieve shearing.

[0023] More specifically, the linear drive mechanism 3 includes a guide rod 31 connected to the opening and closing slide pin 24, a guide assembly 4 is provided between the guide rod 31 and the thread trimmer seat 1, one end of the guide rod 31 is connected to the linear driver 32, and a limited displacement assembly 5 is provided between the guide rod 31 and the thread trimmer assembly 2, which can drive the two blades 22 to move before the guide rod 31 drives the opening and closing slide pin 24 to move along the length direction of the opening and closing guide groove 23.

[0024] More specifically, the limited displacement assembly 5 includes a forward and backward movement limiting groove 51 which is arranged on the thread trimmer seat 1 and has a strip shape and a central axis parallel to the guide rod 31. The end of the hinge pin 21 is arranged in the forward and backward movement limiting groove 51. A front push protrusion 52 is provided on any one of the blade bodies 22. The guide rod 31 is provided with an elastic touch unit 53 that abuts against the front push protrusion 52. When the end of the hinge pin 21 abuts against the end of the forward and backward movement limiting groove 51 in the direction of travel and the resistance encountered by the elastic touch unit 53 is greater than a preset value, the elastic touch unit 53 moves from one side of the front push protrusion 52 to the other side.

[0025] In this embodiment, the hinge pin 21 is positioned within the advance / retract movement limit slot 51, and a forward push-button projection 52 is provided on the blade body 22. This ensures that before the opening / closing slide pin 24 moves along the length of the opening / closing guide slot 23, it first drives the entire blade body 22 forward along the advance / retract movement limit slot 51. This allows the scissors to extend before cutting, facilitating direct contact with the wire being cut, thereby achieving a better cutting effect. Furthermore, when the resistance exceeds a preset value, the elastic touch unit 53 can flip over the forward push-button projection 52 and move to the other side. This prevents excessive extension of the blade body 22, ensuring the quality of the cutting.

[0026] like Figure 2 As shown, the elastic touching unit 53 includes a touching body 531 . The touching body 531 is disposed in the lifting guide groove 532 and can move along the length direction thereof. An elastic component 533 is disposed between the touching body 531 and the guide rod 31 .

[0027] More specifically, a slide pin bracket 33 is provided on the guide rod 31 , the end of the opening and closing slide pin 24 is disposed on the slide pin bracket 33 , the lifting guide slot 532 is provided on the slide pin bracket 33 , and an elastic component 533 is provided between the contact body 531 and the slide pin bracket 33 .

[0028] In this embodiment, the sliding pin bracket 33 includes a concave body 331, with both ends fixed to the guide rod 31. A sliding pin extension mounting plate 332 is provided at the bottom front end of the concave body 331. The sliding pin extension mounting plate 332 is integrally connected to the concave body 331. The end of the opening and closing sliding pin 24 is mounted on the sliding pin extension mounting plate 332.

[0029] More specifically, the elastic component 533 is a spring or a return torsion spring 534 ; and the touching body 531 is a roller 535 .

[0030] In this embodiment, the shaft of the roller 535 is mounted within the lifting guide groove 532, so that the roller 535 can both rotate about its own shaft and move up and down along the lifting guide groove 532. A return torsion spring 534 is mounted on the concave body 331, with one end connected to the shaft of the roller 535 and the other end connected to the guide rod 31. In this way, when the roller 535 and the front push-button protrusion 52 contact each other and the roller 535 passes over the front push-button protrusion 52 to the other side, the return torsion spring 534 can keep the roller 535 in close contact with the front push-button protrusion 52, thereby preventing damage caused by collision caused by excessive extension or retraction of the blade body 22.

[0031] More specifically, the end of the opening and closing slide pin 24 is arranged in the opening and closing guide limit groove 11 of the thread trimmer seat 1, and the opening and closing guide limit groove 11 can ensure that the positions of the two blades 22 relative to the thread trimmer seat 1 remain unchanged.

[0032] More specifically, the guide assembly 4 includes a front guide seat 41 and a rear guide seat 42, and the guide rod 31 is respectively inserted into the front guide hole 43 and the rear guide hole 44 of the front guide seat 41 and the rear guide seat 42, and the front guide hole 43 and the rear guide hole 44 are concentrically arranged.

[0033] More specifically, the feature is that wear-resistant bushings 45 are provided in both the front guide hole 43 and the rear guide hole 44 .

[0034] In this embodiment, a front guide hole 43 and a rear guide hole 44 are provided. The guide rod 31 is respectively inserted into the front guide hole 43 and the rear guide hole 44 of the front guide seat 41 and the rear guide seat 42. This ensures that the guide rod 31 remains horizontal, avoiding tilting due to having only a single fulcrum. Furthermore, wear-resistant bushings 45 are provided in both the front guide hole 43 and the rear guide hole 44 to further prevent wear on the guide rod and extend the service life of the mechanism.

[0035] More specifically, the blade body 22 includes a blade head 222 and a blade body 223 , the blade head 222 partially extends out of the thread trimmer seat 1 , the hinge pin 21 is arranged at the rear end of the blade body 223 , and the opening and closing slide pin 24 is arranged on the blade body 223 between the blade head 222 and the hinge pin 21 .

[0036] The working principle of this embodiment is as follows: in the initial state, the two blade bodies 22 are in the open state, at this time the linear driver 32 drives the guide rod 31 to move linearly forward, and the guide rod 31 drives the opening and closing sliding pin 24 to move linearly forward through the sliding pin bracket 33.

[0037] When the opening and closing slide pin 24 starts to move forward, it does not move relative to the opening and closing guide groove 23. At this time, the blade body 22 moves forward as a whole along the direction of the forward and backward movement limit groove 51, thereby extending the blade body 22.

[0038] When the blade 22 is extended to a limited position, the opening and closing slide pin 24 begins to slide relative to the opening and closing guide groove 23, and the front push protrusion 52 moves from one side to the other side of the elastic touch unit 53, thereby driving the two blades 22 to rotate toward each other around the hinge pin 21 and close together to achieve shearing of the wire.

[0039] After the shearing is completed, the opening and closing slide pin 24 retreats along the opening and closing guide groove 23, and the front push protrusion 52 retreats to the front side of the elastic touch unit 53, the two blades 22 reopen, and then retract into the thread trimmer seat 1 along the forward and backward movement limit groove 51 to complete the cycle, ready to extend out for shearing again.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0041] Although this document frequently uses terms such as thread trimmer seat, opening and closing guide limit groove, thread trimmer assembly, hinge pin, cutter body, blade, cutter head, blade, opening and closing guide groove, opening and closing slide pin, linear drive mechanism, guide rod, linear drive, slide pin bracket, concave body, slide pin extension mounting plate, guide assembly, front guide seat, rear guide seat, front guide hole, rear guide hole, wear-resistant bushing, limited displacement assembly, forward and backward movement limit groove, front push-button protrusion, elastic touch unit, touch body, lifting guide groove, elastic assembly, reset torsion spring, and roller, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention. Interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A thread trimmer assembly, comprising a thread trimmer seat (1), wherein the thread trimmer seat (1) is provided with a thread trimmer assembly (2), wherein the thread trimmer assembly (2) comprises two blades (22) hingedly connected by a hinge pin (21), characterized in that: The two blade bodies (22) are both provided with a strip-shaped opening and closing guide groove (23), and an opening and closing slide pin (24) is inserted into the two opening and closing guide grooves (23) so as to slide along the length direction so that the blades (221) of the two blade bodies (22) rotate toward each other around the hinge pin (21). When the opening and closing slide pin (24) is located at one end of the two opening and closing guide grooves (23), the axes of the two opening and closing guide grooves (23) intersect at one point. The opening and closing slide pin (24) is connected to the linear drive mechanism (3).

2. The thread trimmer assembly according to claim 1, characterized in that: The linear drive mechanism (3) includes a guide rod (31) connected to the opening and closing slide pin (24), a guide assembly (4) is provided between the guide rod (31) and the thread trimmer seat (1), one end of the guide rod (31) is connected to the linear driver (32), and a limited displacement assembly (5) is provided between the guide rod (31) and the thread trimmer assembly (2) that can first drive the two blades (22) to move before the guide rod (31) drives the opening and closing slide pin (24) to move along the length direction of the opening and closing guide groove (23).

3. The thread trimmer assembly according to claim 2, characterized in that: The limited displacement assembly (5) includes a forward and backward movement limiting groove (51) provided on the thread trimmer seat (1) and having a strip shape and a central axis parallel to the guide rod (31); the end of the hinge pin (21) is provided in the forward and backward movement limiting groove (51); any one of the blade bodies (22) is provided with a front push protrusion (52); the guide rod (31) is provided with an elastic touch unit (53) abutting against the front push protrusion (52); when the end of the hinge pin (21) abuts against the end of the forward and backward movement limiting groove (51) in the direction of travel and the resistance experienced by the elastic touch unit (53) is greater than a preset value, the elastic touch unit (53) moves from one side of the front push protrusion (52) to the other side.

4. The thread trimmer assembly according to claim 3, characterized in that: The elastic touch unit (53) comprises a touch body (531), the touch body (531) is arranged in the lifting guide groove (532) and can move along its length direction, and an elastic component (533) is provided between the touch body (531) and the guide rod (31).

5. The thread trimmer assembly according to claim 4, characterized in that: A sliding pin bracket (33) is provided on the guide rod (31), an end portion of the opening and closing sliding pin (24) is arranged on the sliding pin bracket (33), the lifting guide groove (532) is provided on the sliding pin bracket (33), and the elastic component (533) is provided between the touch body (531) and the sliding pin bracket (33).

6. The thread trimmer assembly according to claim 5, characterized in that: The elastic component (533) is a spring or a return torsion spring (534); and the touch body (531) is a roller (535).

7. The thread trimmer assembly according to any one of claims 1 to 6, characterized in that: The end of the opening and closing slide pin (24) is arranged in the opening and closing guide limit groove (11) of the thread trimmer seat (1), and the opening and closing guide limit groove (11) can ensure that the positions of the two knife bodies (22) relative to the thread trimmer seat (1) remain unchanged.

8. The thread trimmer assembly according to any one of claims 2 to 6, characterized in that: The guide assembly (4) includes a front guide seat (41) and a rear guide seat (42), and the guide rod (31) is respectively inserted into the front guide hole (43) and the rear guide hole (44) of the front guide seat (41) and the rear guide seat (42), and the front guide hole (43) and the rear guide hole (44) are concentrically arranged.

9. The thread trimmer assembly according to claim 8, characterized in that: Wear-resistant sleeves (45) are provided in the front guide hole (43) and the rear guide hole (44).

10. The thread trimmer assembly according to any one of claims 2 to 6, characterized in that: The knife body (22) includes a knife head (222) and a knife body (223), wherein the knife head (222) partially extends out of the thread trimmer seat (1), the hinge pin (21) is arranged at the rear end of the knife body (223), and the opening and closing sliding pin (24) is arranged on the knife body (223) between the knife head (222) and the hinge pin (21).

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