Few-nest movable cutter and sewing machine thread trimming mechanism

Abstract

The utility model discloses a movable knife capable of reducing bird nests. The movable knife comprises a movable knife body, the movable cutter body is provided with a sewing-starting thread trimming opening, a thread clamping part, a sewing-starting needle passing groove and cutter lifting wings, and the thread clamping part is arranged on the surface of the cutter body between the sewing-starting thread trimming opening and the sewing-starting needle passing groove; when the movable cutter body moves towards the direction of a fixed cutter in the thread trimming mechanism, the thread pressing part of the fixed cutter abuts against the thread clamping part to clamp an upper thread, and then the seam starting thread trimming opening and the fixed cutter are meshed to cut off the thread end of the upper thread. The utility model further discloses a sewing machine thread trimming mechanism adopting the movable cutter. When sewing is started, a machine needle penetrates through the sewing starting trimming opening to bring the thread end of an upper thread to the position below the movable knife with the few bird nests, the upper thread is clamped in a matched mode, the sewing starting trimming opening and the fixed knife are meshed to cut off the thread end of the upper thread, and after sewing is started for several stitches, the movable knife body moves towards the fixed knife to cut off the bottom upper thread. Upper thread ends are cut off when sewing is started, bottom threads can be cut off when sewing is finished, bird nests are effectively prevented from being formed, threads can be clamped to be prevented from falling off, the structure is simple, and sewing quality is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, concretely relates to a few bird nest movable knife and sewing machine thread trimming mechanism. BACKGROUND

[0002] When the sewing machine starts sewing the sewing material, a certain length of thread head is left at the needle eye, and the thread head is brought to the back of the sewing material at the initial position of the sewing material, which will appear a bird nest-like thread ball, the bird nest formed in the initial stage of sewing is not beautiful, and is not accepted by everyone, especially for the clothing quality with high sewing requirement, there are several ways to deal with the bird nest, such as using the thread lifter, the electronic thread clipper, etc., although the structure is simple, but the effect of removing the bird nest is not ideal. Therefore, the market needs to solve the above problems to meet the sewing quality requirements. SUMMARY

[0003] The utility model discloses a kind of movable knives of few bird nests and sewing machine thread trimming mechanisms to solve the problems presented in the above background art.

[0004] To achieve the above object, the technical scheme of the utility model is as follows: a few bird nest movable knives, including movable knife body;The movable knife body is equipped with start sewing thread trimming port, thread clamping part, start sewing needle passing groove, knife lifting wing, the thread clamping part is arranged on the surface of the movable knife body between start sewing thread trimming port and start sewing needle passing groove;Start sewing thread trimming port can be corresponded with needle, and the needle can pass through, when the movable knife body moves towards the fixed knife in thread trimming mechanism, the fixed knife thread pressing part and the thread clamping part first abut and clamp the thread, then start sewing thread trimming port and fixed knife bite and remove the thread head of thread, and needle can carry out sewing work in start sewing needle passing groove.

[0005] In the above-mentioned a few bird nest movable knives, the movable knife body is equipped with thread trimming and dividing sharp part and thread dividing groove, and start sewing needle passing groove is distributed between thread trimming and dividing sharp part and thread clamping part.

[0006] In the above-mentioned a few bird nest movable knives, the movable knife body is also equipped with thread containing groove and sewing rear thread trimming blade mouth, and thread containing groove is connected between sewing rear thread trimming blade mouth and thread dividing groove.

[0007] In the above-mentioned a few bird nest movable knives, the movable knife body is also formed with blade mouth bump and bump through-hole, and sewing rear thread trimming blade mouth is distributed at the front position of the bump through-hole.

[0008] In the above-mentioned a few bird nest movable knives, sewing rear thread trimming blade mouth, thread containing groove, thread dividing groove, thread clamping part and start sewing thread trimming port are on the same trajectory line S1.

[0009] In the above-mentioned a few bird nest movable knives, the movable knife body is also equipped with the extension root of start sewing thread trimming port between knife lifting wing and thread trimming and dividing sharp part.

[0010] In the aforementioned type of movable knife for reducing bird nests, two adjustment and mounting holes are machined on the movable knife body to facilitate fixed installation on the moving knife holder of the sewing machine's thread cutting mechanism.

[0011] This utility model also includes a sewing machine thread cutting mechanism, which has the above-mentioned movable blade with fewer bird nests, and also includes a fixed blade, a thread separating piece, and a thread cutting drive source; the fixed blade is provided with a fixed blade pressing part.

[0012] By adopting the above-described technical solution, this utility model has the following beneficial effects:

[0013] In this invention, during the initial stitching, the needle passes through the initial stitch cutting opening and brings the top thread end to the underside of the movable blade to prevent bird nest formation. The top thread is then clamped, and the thread end is cut off by the engagement of the initial stitch cutting opening and the fixed blade. After several stitches, the movable blade moves the bottom and top threads towards the fixed blade until the final stitch cutting edge engages with the fixed blade to cut the bottom and top threads. The cut thread end is then sucked away by a suction device. This design achieves the ability to cut the top thread end during the initial stitching and cut the bottom and top threads at the end of the sewing, effectively preventing bird nest formation. It also clamps the thread to prevent it from coming loose. The structure is simple, resulting in better sewing quality and reducing the need for manual thread trimming. Attached Figure Description

[0014] Figure 1 , Figure 2 , Figure 3 This is a perspective view of the thread-cutting mechanism of the sewing machine in this utility model;

[0015] Figure 4 This is a plan view of the movable blade for the bird's nest in this utility model;

[0016] Figure 5 This is a perspective view of the movable knife with fewer bird nests in this utility model. Detailed Implementation

[0017] The present invention will be further described in conjunction with the accompanying drawings.

[0018] Please see Figures 1 to 3 This utility model provides a sewing machine thread cutting mechanism, including a movable blade, a fixed blade 20, a thread separating piece 30, and a thread cutting drive source; the fixed blade 20 is provided with a fixed blade pressing part 201.

[0019] See Figures 1 to 5A type of movable knife for reducing bird nests includes a movable knife body 10. The movable knife body 10 is provided with a thread-cutting opening 103, a thread clamping part 1031, a needle-passing groove 1032, and a lifting wing 102. The thread clamping part 1031 is disposed on the surface of the knife body between the thread-cutting opening 103 and the needle-passing groove 1032. The thread-cutting opening 103 can correspond to and pass through the needle. When the movable knife body 10 moves towards the fixed knife 20 in the thread-cutting mechanism, the fixed knife thread-pressing part 201 and the thread clamping part 1031 first abut against each other and clamp the top thread. Then, the thread-cutting opening 103 and the fixed knife 20 bite together to cut off the thread end of the top thread. The needle can then perform sewing work in the needle-passing groove 1032.

[0020] Furthermore, the movable blade body 10 is provided with a thread cutting and separating tip 104 and a thread separating groove 105, and the starting needle groove 1032 is distributed between the thread cutting and separating tip 104 and the thread clamping part 1031.

[0021] Furthermore, the movable blade body 10 is also provided with a thread receiving groove 106 and a post-sewing thread cutting edge 107, wherein the thread receiving groove 106 is connected between the post-sewing thread cutting edge 107 and the thread separating groove 105.

[0022] Furthermore, the movable blade body 10 is also formed with a blade edge bulge 108 and a bulge through hole 1081, and the sewing cutter edge 107 is distributed at the front edge of the bulge through hole 1081.

[0023] Furthermore, the post-seam thread cutting edge 107, the thread receiving groove 106, the thread separating groove 105, the thread clamping part 1031, and the sewing start thread cutting edge 103 are all on the same trajectory line S1.

[0024] Furthermore, the movable blade body 10 is provided with an extension root 1033 of the starting seam cutting opening 103 between the lifting blade wing 102 and the cutting and separating tip 104.

[0025] Furthermore, the movable blade body 10 is machined with two adjustment mounting holes 101 to facilitate fixed installation on the moving blade holder of the sewing machine thread cutting mechanism.

[0026] The working principle of this utility model will be further described below:

[0027] Turn on the power switch, the thread cutter drive is activated, and the movable blade 10 moves, causing the thread-cutting opening 103 to move directly below the needle 30. When the foot pedal is pressed forward, the needle begins to descend, and the needle and the top thread pass through the thread-cutting opening 103. Under the action of the rotary hook, the thread end at the needle is brought under the blade 10. The needle moves upward from the bottom dead center. After the thread take-up lever reaches the top dead center, the movable blade 10 moves, causing the thread-cutting needle groove 1032 to move directly below the needle. At this time, the fixed blade thread pressing part 201 and the thread clamping part 1031 first come into contact and clamp the top thread, and then the thread-cutting opening 103 and the fixed blade 20 engage to cut off the thread end. The suction device removes the thread end, and the sewing machine begins sewing the second stitch, the third stitch, and so on. As the fabric is fed, the thread end between the fixed blade pressing part 201 and the thread clamping part 1031 is broken, and the sewing machine continues sewing. After the fabric is fed forward to the specified number of stitches, the sewing machine stops, the foot pedal is pressed, and the movable blade 10 moves towards the fixed blade 20 with the bottom and top threads until the sewing cutter edge 107 engages with the fixed blade 20 and cuts the bottom and top threads. Then, the movable blade 10 moves away from the fixed blade 20 until the starting sewing cutter edge 103 moves directly below the needle and stops. The movable blade returns to its original position, and the next sewing cycle is repeated.

[0028] The foregoing has provided a detailed description of a bird nest-reducing movable knife and a sewing machine thread-cutting mechanism provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solution disclosed in this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A movable knife for reducing bird nests, comprising a movable knife body (10); characterized in that: The movable blade (10) is provided with a sewing thread cutting opening (103), a thread clamping part (1031), a sewing needle passage groove (1032), and a lifting blade wing (102). The thread clamping part (1031) is located on the surface of the blade between the sewing thread cutting opening (103) and the sewing needle passage groove (1032). The sewing thread cutting opening (103) can correspond to the needle and allow it to pass through. When the movable blade (10) moves toward the fixed blade (20) in the thread cutting mechanism, the fixed blade thread pressing part (201) and the thread clamping part (1031) first abut against each other and clamp the top thread, and then the sewing thread cutting opening (103) and the fixed blade (20) bite together to cut off the thread end of the top thread. The needle can perform sewing work in the sewing needle passage groove (1032).

2. The bird nest-reducing mobile knife according to claim 1, characterized in that: The movable blade (10) is provided with a thread cutting and separating tip (104) and a thread separating groove (105), and the starting needle groove (1032) is distributed between the thread cutting and separating tip (104) and the thread clamping part (1031).

3. The bird nest-reducing mobile knife according to claim 2, characterized in that: The movable blade (10) is also provided with a thread-receiving groove (106) and a post-sewing thread-cutting blade (107), and the thread-receiving groove (106) is connected between the post-sewing thread-cutting blade (107) and the thread-separating groove (105).

4. The bird nest-reducing mobile knife according to claim 3, characterized in that: The movable blade (10) also has a blade bulge (108) and a bulge through hole (1081), and the sewing cut edge (107) is distributed at the front edge of the bulge through hole (1081).

5. The bird nest-reducing mobile knife according to claim 4, characterized in that: The thread cutting edge (107), thread receiving groove (106), thread separating groove (105), thread clamping part (1031), and thread cutting opening (103) after sewing are all on the same trajectory line S1.

6. The bird nest-reducing mobile knife according to claim 1, characterized in that: The movable blade (10) also has an extension root (1033) of the starting seam cutting opening (103) between the lifting blade wing (102) and the cutting and separating tip (104).

7. A small-nest-moving knife according to any one of claims 1 to 6, characterized in that: The movable blade body (10) has two adjustment mounting holes (101) for fixed installation on the moving blade holder of the sewing machine thread cutting mechanism.

8. A thread-cutting mechanism for a sewing machine, characterized in that: The bird nest removal knife according to any one of claims 1 to 7 further includes a fixed blade (20), a wire separating piece (30), and a wire cutting drive source; the fixed blade (20) is provided with a fixed blade pressing part (201).

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