Wire cutting device

Abstract

The utility model discloses a thread cutting device which comprises a thread cutting machine, the thread cutting machine is provided with an upper cutter and a lower cutter which are matched with each other, the thread cutting machine is provided with a needle plate, the needle plate is matched with the upper cutter, and the needle plate is matched with the lower cutter. According to the utility model, the lower cutter is matched with the needle plate in the thread cutting work, the lower cutter is in contact with the needle plate for a certain time, and the lower cutter is provided with a plurality of sections of cutting edges, so that the thread passing through the needle plate can be well cut; the upper cutter is in contact with the needle plate for a certain time in the thread cutting work, the upper cutter completes the thread cutting work on the thread passing through the needle plate, and therefore the thread cutting quality and effect are guaranteed.

Description

A tangent device Technical Field

[0001] This utility model belongs to the technical field of wire tangent equipment, and specifically relates to a wire tangent device. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines require a thread cutter to complete the work. Some existing sewing machines on the market use a double-blade thread cutter mechanism, where the upper and lower cutters engage with the needle plate to cut the thread. However, there are shortcomings in the coordination of the contact surfaces of these three parts, affecting the cutting effect and quality, necessitating further structural improvements. Summary of the Invention

[0003] The purpose of this invention is to provide a tangent device to solve the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A thread cutting device includes a thread cutting machine, which is provided with an upper cutting blade and a lower cutting blade that cooperate with each other. The thread cutting machine is equipped with a needle plate, which cooperates with the upper cutting blade and the lower cutting blade. The upper cutting blade includes a cutting blade a and a cutting blade b connected to each other. The cutting blade a is provided with a first through hole and a second through hole. The cutting blade b includes a first bending portion and a second bending portion. The cutting blade b has an upper cutting first surface, an upper cutting second surface, an upper cutting third surface, and a cutting arc surface. The upper cutting first surface and the upper cutting second surface are formed by the first bending portion and are parallel. The upper cutting second surface and the upper cutting third surface are formed by the second bending portion and have an angle of degrees between them. The upper cutting blade forms a first cutting edge on the upper cutting third surface, and the first cutting edge cooperates with the needle plate.

[0006] Preferably, the lower cutter includes a protrusion, an arc-shaped groove, a first arc-shaped surface, and a second arc-shaped surface. The lower cutter is provided with a first lower cutter through hole and a second lower cutter through hole. The two ends of the first lower cutter through hole and the second lower cutter through hole are respectively located on the first arc-shaped surface and the second arc-shaped surface. The protrusion is machined at the position of the first lower cutter through hole on the first arc-shaped surface. The arc-shaped groove is machined on the first arc-shaped surface and connects the protrusion and the first lower cutter through hole. The second arc-shaped groove cooperates with the needle plate.

[0007] Preferably, the lower cutting blade is machined to form a second cutting edge at the position of the arc-shaped groove, and the second cutting edge cooperates with the needle plate.

[0008] Preferably, the needle plate includes a first sector surface and a second sector surface. The needle plate is machined with positioning holes, threading holes, scale lines, a first window, a second window, a third window, and a mating arc surface. The positioning holes are symmetrically distributed about the symmetrical surface of the needle plate. The first window, the second window, and the third window are equidistantly distributed along the symmetrical surface of the needle plate. The two second windows are symmetrical about the threading holes. The scale lines are located on the first sector surface and are set as a plurality of equidistantly distributed scale lines. A mating arc surface is machined at the position where the second window and the positioning hole are located on the second sector surface. The mating arc surface mates with the first cutting edge.

[0009] Preferably, the first window is rectangular, and the third window has a slope at the position of the second sector surface.

[0010] Preferably, the wire cutter has a mounting shaft that mates with the positioning hole.

[0011] Beneficial effects: By incorporating a lower cutter and an upper cutter, the second blade of the lower cutter engages with the mating arc surface of the needle plate during the cutting process. The second blade remains in contact with the mating arc surface for a certain period during its movement. The thread-passing hole is located at the center of the mating arc surface. The second blade has multiple cutting edges, effectively cutting the thread passing through the thread-passing hole. Similarly, the first blade of the upper cutter engages with the mating arc surface of the needle plate during the cutting process. The first blade remains in contact with the mating arc surface for a certain period during its movement, cutting the thread passing through the thread-passing hole. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 is a schematic diagram of the lower cutting blade of this utility model.

[0014] Figure 3 is a schematic diagram of the needle plate of this utility model.

[0015] Figure 4 is a schematic diagram of the upper cutting blade of this utility model.

[0016] The figure shows: 1. Cutting machine; 2. Lower cutter; 21. Protrusion; 22. Arc groove; 23. First arc surface; 24. Second arc surface; 25. First through hole of lower cutter; 26. Second through hole of lower cutter; 27. Second blade; 3. Needle plate; 31. Positioning hole; 32. Threading hole; 33. Scale line; 34. First window; 35. Second window; 36. Third window; 37. Matching arc surface; 38. First sector surface; 39. Second sector surface; 4. Upper cutter; 41. Cutter a; 42. First through hole of cutter a; 43. Second through hole of cutter a; 44. First upper cutter surface; 45. Second upper cutter surface; 46. Third upper cutter surface; 47. First bend; 48. Second bend; 49. First blade; 410. Cutter b. Detailed Implementation

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is intended to help understand this utility model, but does not constitute a limitation on this utility model. Embodiments

[0018] As shown in Figure 1, this embodiment provides a thread cutting device, including a thread cutting machine 1. The thread cutting machine 1 is equipped with an upper cutting blade 4 and a lower cutting blade 2 that cooperate with each other. The thread cutting machine 1 is equipped with a needle plate 3. The needle plate 3 cooperates with the upper cutting blade 4. The upper cutting blade 4 cuts the thread passing through the needle plate 3. The needle plate 3 cooperates with the lower cutting blade 2. The lower cutting blade 2 cuts the thread passing through the needle plate 3.

[0019] Referring to Figures 1 and 4, the upper cutter 4 (not labeled in Figure 4) includes cutter a41 and cutter b410 connected to each other. Cutter a41 has a first through hole 42 and a second through hole 43 for positioning and mounting the upper cutter 4 onto the wire cutting machine 1. Cutter b410 includes a first bending portion 47 and a second bending portion 48. Cutter b410 has an upper cutting first surface 44, an upper cutting second surface 45, an upper cutting third surface 46, and a cutting arc surface. The upper cutting first surface 44 and the upper cutting second surface 45 are formed by the first bending portion 47 and are parallel to each other. The second cutting surface 45 and the upper cutting third surface 46 are formed by the second bending part 48. The angle between the upper cutting second surface 45 and the upper cutting third surface 46 is 120 degrees. The upper cutting knife 4 is processed on the upper cutting third surface 46 to form the first cutting edge 49. The upper cutting knife 4 is ground at a certain angle to form the first cutting edge 49. The first cutting edge 49 cooperates with the needle plate 3. The first cutting edge 49 of the upper cutting knife 4 and the mating arc surface 37 of the needle plate 3 cooperate in the cutting work. The first cutting edge 49 will maintain contact with the mating arc surface 37 for a certain period of time during the movement. The first cutting edge 49 completes the cutting work of the thread passing through the thread hole 32.

[0020] Referring to Figures 1 and 2, Figure 2 does not show the existing lower cutter. The lower cutter 2 includes a protrusion 21, an arc-shaped groove 22, a first arc-shaped surface 23, and a second arc-shaped surface 24. The lower cutter 2 is provided with a first lower cutter through hole 25 and a second lower cutter through hole 26. The second lower cutter through hole 26 is used to position and install the lower cutter 2 onto the wire cutting machine 1. The two ends of the first lower cutter through hole 25 and the second lower cutter through hole 26 are located at the first arc-shaped surface 23 and the second arc-shaped surface 24, respectively. The protrusion 21 is machined at the position of the first lower cutter through hole 25 on the first arc-shaped surface 23. The arc-shaped groove 22 is machined on the first arc-shaped surface 23 and connects the protrusion 21 and the first lower cutter through hole 25. The second arc-shaped groove 22 cooperates with the needle plate 3. The lower cutter 2 is machined to form a second cutting edge 27 at the position of the arc groove 22. The second cutting edge 27 cooperates with the needle plate 3. The second cutting edge 27 of the lower cutter 2 and the mating arc surface 37 of the needle plate 3 cooperate during the cutting work. During the movement, the second cutting edge 27 will maintain contact with the mating arc surface 37 for a certain period of time. The thread hole 32 is located at the center of the mating arc surface 37. The second cutting edge 27 has multiple cutting edges, which can effectively cut the thread passing through the thread hole 32.

[0021] Referring to Figures 1 and 3, the needle plate 3 (not labeled in Figure 3) is the existing needle plate 3. The needle plate 3 includes a first sector surface 38 and a second sector surface 39. The needle plate 3 is machined with positioning holes 31, threading holes 32, scale lines 33, a first window 34, a second window 35, a third window 36, and a mating arc surface 37. The positioning holes 31 are symmetrically distributed about the symmetrical surfaces of the needle plate 3. The positioning holes 31 are used for positioning the needle plate 3 and installing it onto the thread cutter 1. The first window 34, the second window 35, and the third window 36 are along the symmetrical surfaces of the needle plate 3. The surfaces are evenly distributed, with two second windows 35 symmetrical about the threading hole 32. The scale line 33 is located on the first sector surface 38, and the scale line 33 is set as multiple evenly distributed. The second sector surface 39 is machined to form a mating arc surface 37 at the position of the second window 35 and the positioning hole 31. The mating arc surface 37 mates with the first cutting edge 49. The first window 34 is cuboid in shape. The third window 36 is provided with a slope at the position of the second sector surface 39. The wire cutting machine 1 has a mounting shaft that mates with the positioning hole 31.

[0022] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tangent device, characterized in that, The device includes a thread cutting machine (1), which is equipped with an upper cutting blade (4) and a lower cutting blade (2) that cooperate with each other. The thread cutting machine (1) is equipped with a needle plate (3), which cooperates with the upper cutting blade (4) and the lower cutting blade (2). The upper cutting blade (4) includes a cutting blade a (41) and a cutting blade b (410) that are connected to each other. The cutting blade a (41) is provided with a first through hole (42) and a second through hole (43). The cutting blade b (410) includes a first bending part (47) and a second bending part (48). The cutting blade b (410) has an upper cutting first surface (44) and an upper cutting surface (48). The upper cutting surface (45), the upper cutting surface (46), and the cutting blade arc surface are formed by the first bending part (47), the upper cutting surface (44) and the upper cutting surface (45) are parallel, the upper cutting surface (45) and the upper cutting surface (46) are formed by the second bending part (48), the angle between the upper cutting surface (45) and the upper cutting surface (46) is 120 degrees, the upper cutting blade (4) is processed on the upper cutting surface (46) to form a first cutting edge (49), and the first cutting edge (49) cooperates with the needle plate (3).

2. The tangent device according to claim 1, characterized in that, The lower cutter (2) includes a protrusion (21), an arc groove (22), a first arc surface (23), and a second arc surface (24). The lower cutter (2) is provided with a lower cutter first through hole (25) and a lower cutter second through hole (26). The two ends of the lower cutter first through hole (25) and the lower cutter second through hole (26) are located on the first arc surface (23) and the second arc surface (24), respectively. The protrusion (21) is formed at the position of the lower cutter first through hole (25) on the first arc surface (23). The arc groove (22) is formed on the first arc surface (23) and connects the protrusion (21) and the lower cutter first through hole (25). The second arc groove (22) cooperates with the needle plate (3).

3. The tangent device according to claim 2, characterized in that, The lower cutter (2) is machined to form a second cutting edge (27) at the position of the arc groove (22), and the second cutting edge (27) cooperates with the needle plate (3).

4. The tangent device according to claim 1, characterized in that, The needle plate (3) includes a first sector surface (38) and a second sector surface (39). The needle plate (3) is machined with positioning holes (31), threading holes (32), scale lines (33), a first window (34), a second window (35), a third window (36), and a mating arc surface (37). The positioning holes (31) are symmetrically distributed about the symmetrical surface of the needle plate (3). The first window (34), the second window (35), and the third window (36) are equidistantly distributed along the symmetrical surface of the needle plate (3). The two second windows (35) are symmetrical about the threading holes (32). The scale lines (33) are located on the first sector surface (38). The scale lines (33) are set as multiple equidistantly distributed. The mating arc surface (37) is machined at the position where the second window (35) and the positioning hole (31) are set on the second sector surface (39). The mating arc surface (37) is mated with the first cutting edge (49).

5. The tangent device according to claim 4, characterized in that, The first window (34) is rectangular, and the third window (36) has a slope at the position of the second sector (39).

6. The tangent device according to claim 4, characterized in that, The wire cutter (1) has a mounting shaft that mates with the positioning hole (31).

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