Curved needle structure of sewing machine

Abstract

The utility model provides a curved needle structure of a sewing machine, and belongs to the technical field of sewing machines. The problem of how to ensure that the threading operation of the curved needle is not affected while the sewing quality is improved is solved. The curved needle structure comprises a needle rod, a strip-shaped groove is formed in the surface of one side of the needle rod, a thread inlet channel communicated with the strip-shaped groove is formed in the rear end of the needle rod, a thread outlet hole communicated with the strip-shaped groove is formed in the front end of the needle rod, a plate-shaped thread blocking part is fixed or integrally formed between the left side groove wall and the right side groove wall of the strip-shaped groove, and the number of the thread blocking part is one. The length of the thread blocking part is smaller than one half of the length of the strip-shaped groove, and a thread passing channel for a sewing thread to penetrate through is formed between the thread blocking part and the bottom face of the strip-shaped groove. According to the curved needle structure, the thread blocking part is reasonably and additionally arranged, so that the thread can be prevented from running out of the strip-shaped groove, the frizz of the thread can be smoothed, the fracture risk of the thread can be reduced, the sewing quality and efficiency of a sewing machine are greatly improved, and meanwhile it is guaranteed that threading operation of the curved needle is not affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a curved needle structure of a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. A sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm, and the sewing speed is fast and easy to use.

[0003] Among them, the circular sewing process is a stitch formed by lock-stitching the needle thread and the curved needle thread under the fabric. The curved needle is an indispensable part of the sewing machine for circular sewing operations, such as a curved needle of a sewing machine that can well hold and detach the needle thread as disclosed in Chinese patent document CN 202202129 U, or a curved needle of a sewing machine as disclosed in Chinese patent document CN 207567453 U. In the above-mentioned existing curved needle structure, a strip groove extending from the rear end of the needle rod to the needle tip is provided on the surface of the needle bar. During the sewing process, due to the long opening length of the strip groove, the bottom line threaded on the curved needle is easy to run out of the strip groove, which will cause the suture thread to be tangled, the stitches to be skipped, the stitches to be uneven, and other situations that affect the sewing quality will occur. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the prior art and to propose a curved needle structure for a sewing machine. The technical problem to be solved by the utility model is how to improve the sewing quality while ensuring that the threading operation of the curved needle is not affected.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a curved needle structure of a sewing machine, comprising a needle bar, a strip groove extending from the rear end to the front end of the needle bar is provided on one side surface of the needle bar, the rear end of the needle bar is provided with a wire inlet channel connected to the strip groove, and the front end of the needle bar is provided with a wire outlet hole connected to the strip groove, characterized in that a plate-shaped wire blocking portion is fixed or integrally formed between the left and right side groove walls of the strip groove, the number of the wire blocking portion is one, the length of the wire blocking portion is less than half of the length of the strip groove, and a wire passing channel for the thread to pass through is formed between the wire blocking portion and the bottom surface of the strip groove.

[0006] Different from the prior art, the utility model adds a plate-shaped thread blocking portion between the left and right groove walls of the needle bar strip groove, and a thread passing channel for thread passing is formed between the thread blocking portion and the bottom surface of the strip groove. After such design, after the suture of the curved needle passes through the thread entry channel and enters the strip groove, it needs to pass through the thread passing channel before it can pass through the thread outlet hole. After the threading is completed, when the suture is pulled during the sewing process, the suture in the thread passing channel will be blocked by the thread blocking portion, so that the suture passed through the strip groove is not easy to run out of the strip groove. This avoids problems such as tangling, skipped stitches, and uneven stitches in the sutures, thereby improving the sewing quality. At the same time, although the design of the above thread stop will cause the thread threading operation to have an additional step of passing through the thread channel, since there is only one thread stop and its length is less than half of the length of the strip groove, this design makes the thread passing channel relatively short and only one, and also reserves sufficient threading operation space for the strip groove, so that the thread threading operation of the strip groove suture is not affected by the design of the thread stop, thereby ensuring that the threading operation of the curved needle is not affected.

[0007] In the above-mentioned curved needle structure of the sewing machine, the thread blocking part divides the notch of the strip groove into two, namely the front notch and the rear notch from front to back, and the length of the front notch is smaller than the length of the rear notch. Through the above design, the arrangement position of the thread blocking part is closer to the front end of the strip groove. Since the thread outlet hole is also located at the front end of the needle bar, relatively speaking, the suture near the thread outlet hole needs to be put in a section during the sewing process, which is easier to run out of the strip groove. Then, through the position arrangement of the above thread blocking part, it is more effective to prevent the suture from running out of the strip groove, thereby improving the sewing quality.

[0008] In the curved needle structure of the sewing machine mentioned above, the port where the inlet channel communicates with the strip groove is the inlet outlet, which is circular and located on the groove wall at the rear end of the strip groove, and the distance between the thread stopper and the bottom surface of the strip groove is smaller than the diameter of the inlet outlet. Since the suture will be roughened due to the movement friction in the inlet channel during the sewing and pulling process, the arrangement distance design of the thread stopper plate, that is, the distance between the thread stopper and the bottom surface of the strip groove is smaller than the diameter of the inlet outlet, makes it easier for the thread stopper to contact the passing suture, so that the thread stopper can be used to smooth out the roughness, thereby improving the sewing quality; moreover, smoothing out the roughness can also make the suture less likely to be torn in the subsequent process, avoiding repeated threading, thereby improving the sewing efficiency.

[0009] In the above-mentioned curved needle structure of the sewing machine, there is a gap between the left edge of the thread inlet and the left side wall of the strip groove, and there is a gap between the right edge of the thread inlet and the right side wall of the strip groove. Through the above-mentioned design of the thread inlet, since there is a gap between the left and right sides of the thread inlet and the wall of the strip groove, the friction between the thread and the wall of the strip groove can be reduced when the thread is led out from the thread inlet, which is conducive to reducing the risk of the thread being broken.

[0010] In the above-mentioned curved needle structure of the sewing machine, the edges of the front and rear ends of the thread stopper are arc-shaped. Through the above arc-shaped design, the risk of the suture being cut by the thread stopper can be reduced.

[0011] In the above-mentioned needle bending structure of the sewing machine, the length of the thread passage is shorter than the length of the thread inlet passage. Since the thread inlet passage is relatively short, the further design of the thread passage, that is, the design length of the thread passage is shorter, further avoids and ensures that the addition of the thread passage will not affect the threading operation of the needle bending.

[0012] Compared with the prior art, the curved needle structure of the sewing machine has the following advantages: the curved needle structure can not only prevent the thread from running out of the strip groove, but also smooth out the frizziness of the thread and reduce the risk of thread breakage by reasonably adding a thread blocking part. While greatly improving the sewing quality and efficiency of the sewing machine, it ensures that the threading operation of the curved needle is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional structure diagram of the curved needle. Figure 1 .

[0014] Figure 2 This is a three-dimensional structure diagram of the curved needle. Figure 2 .

[0015] Figure 3 It is a plan view of the bending needle.

[0016] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure in the AA direction.

[0017] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure in the BB direction.

[0018] In the figure, 1, needle bar; 2, strip groove; 21, front notch; 22, rear notch; 3, wire inlet channel; 31, wire inlet outlet; 4, wire outlet hole; 5, wire blocking part; 6, wire passing channel. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] Specifically, if Figure 1 , Figure 2 and Figure 3 As shown, the curved needle structure of the sewing machine includes a needle bar 1, and a strip groove 2 extending from the rear end to the front end of the needle bar 1 is provided on one side surface of the needle bar 1, and a wire inlet channel 3 connected to the strip groove 2 is provided at the rear end of the needle bar 1, and a wire outlet hole 4 connected to the strip groove 2 is provided at the front end of the needle bar 1. A plate-shaped wire blocking portion 5 is fixed or integrally formed between the left and right groove walls of the strip groove 2, and there is one wire blocking portion 5, and the edges of the front and rear ends of the wire blocking portion 5 are arc-shaped, and the length of the wire blocking portion 5 is less than half of the length of the strip groove 2. A wire passing channel 6 for the sewing thread to pass through is formed between the wire blocking portion 5 and the bottom surface of the strip groove 2. Preferably, in this embodiment, the length of the wire passing channel 6 is less than the length of the wire inlet channel 3. The wire blocking portion 5 divides the notch of the strip groove 2 into two, which are a front notch 21 and a rear notch 22 from front to back, and the length of the front notch 21 is less than the length of the rear notch 22.

[0021] More specifically, if Figure 4 and Figure 5 As shown, the port connecting the inlet channel 3 and the strip groove 2 is the inlet outlet 31, which is circular and located on the groove wall at the rear end of the strip groove 2, and the distance between the wire blocking portion 5 and the bottom surface of the strip groove 2 is smaller than the diameter of the inlet outlet 31. There is a gap between the left edge of the inlet outlet 31 and the left groove wall of the strip groove 2, and there is a gap between the right edge of the inlet outlet 31 and the right groove wall of the strip groove 2.

[0022] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0023] Although the terms such as needle bar 1, strip groove 2, front notch 21, rear notch 22, inlet wire channel 3, inlet wire outlet 31, outlet wire hole 4, wire blocking portion 5, wire passage 6 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A curved needle structure for a sewing machine, comprising a needle bar (1), a strip groove (2) extending from the rear end to the front end of the needle bar (1) on one side surface of the needle bar (1), a wire inlet channel (3) connected to the strip groove (2) at the rear end of the needle bar (1), and a wire outlet hole (4) connected to the strip groove (2) at the front end of the needle bar (1), characterized in that: A plate-shaped thread-blocking portion (5) is fixed or integrally formed between the left and right groove walls of the strip groove (2), the thread-blocking portion (5) being one and the length of which is less than half the length of the strip groove (2), and a thread-passing channel (6) for passing a suture thread is formed between the thread-blocking portion (5) and the bottom surface of the strip groove (2).

2. The looper structure of a sewing machine according to claim 1, characterized in that: The line blocking portion (5) divides the notch of the strip groove (2) into two, namely a front notch (21) and a rear notch (22) from front to back, and the length of the front notch (21) is shorter than the length of the rear notch (22).

3. The looper structure of a sewing machine according to claim 1 or 2, characterized in that: The port connecting the inlet channel (3) and the strip groove (2) is an inlet outlet (31), the inlet outlet (31) is circular and located on the groove wall at the rear end of the strip groove (2), and the distance between the wire blocking portion (5) and the bottom surface of the strip groove (2) is smaller than the diameter of the inlet outlet (31).

4. The looper structure of a sewing machine according to claim 3, characterized in that: There is a distance between the left edge of the inlet outlet (31) and the left side wall of the strip-shaped slot (2), and there is a distance between the right edge of the inlet outlet (31) and the right side wall of the strip-shaped slot (2).

5. The looper structure of a sewing machine according to claim 1 or 2, characterized in that: The edges of the line blocking portion (5) at the front and rear ends are arc-shaped.

6. The looper structure of a sewing machine according to claim 1 or 2, characterized in that: The length of the line-passing channel (6) is shorter than the length of the line-inlet channel (3).

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