Thread separating piece structure of sewing machine

Abstract

The utility model provides a thread separating piece structure of a sewing machine, and belongs to the technical field of sewing machines. The sewing machine solves the problem that in the prior art, a sewing machine is poor in performance stability. The thread separating sheet structure of the sewing machine comprises a thread separating sheet body, the thread separating sheet body comprises a sheet-shaped installation part and a thread separating part which is bent relative to the installation part, the thread separating sheet body is connected with an extending blocking sheet, and a limiting groove used for containing a bottom thread is formed between the extending blocking sheet and the thread separating part of the thread separating sheet body. The limiting groove is provided with a limiting hook part on any side or two side groove walls close to the groove opening, and the limiting hook part extends towards the groove wall on the opposite side. The sewing machine has the advantage that the stability of the performance of the sewing machine can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a thread divider structure for a sewing machine. Background Technology

[0002] A thread separator is a component on a sewing machine used to separate threads when cutting them. For example, Chinese patent literature discloses a thread-cutting mechanism capable of separating the top thread and the bottom thread, as well as a sewing machine (application number: 202321401978.X). This mechanism is used to cut threads at the rotary hook of the sewing machine. It includes a first thread-cutting blade and a second thread-cutting blade. The first thread-cutting blade has a first cutting edge, and the second thread-cutting blade has a second cutting edge. It also includes a thread-cutting hook for hooking the bottom thread and the top thread and moving towards the first thread-cutting blade. The second thread-cutting blade can rotate relative to the first thread-cutting blade until the second cutting edge engages with or separates from the first cutting edge. The thread-cutting mechanism also includes a thread separator, which is located below the second thread-cutting blade, that is, on the side of the second thread-cutting blade near the rotary hook. When cutting the thread, the second thread-cutting blade is inserted above the thread separator, which is used to better separate the loops of the top thread.

[0003] The thread-cutting mechanism that separates the top and bottom threads, and the shortcomings of the sewing machine during use, are as follows: Although the moving blade is equipped with bottom and top thread receiving grooves, after cutting, the moving blade must return to its original position and leave the stationary blade. Therefore, when sewing resumes next time, the bottom and top thread receiving grooves on the moving blade cannot effectively position the bottom and top threads. At this time, the thread separator needs to re-engage with the stationary blade under elasticity and capture the bottom thread end to ensure the stability of the bottom thread end position after cutting. However, after cutting, when the user removes the fabric, the top thread will be pulled, which can easily cause the bottom thread to move. Alternatively, when sewing resumes next time, the high-speed rotating shuttle hook may hit the bottom thread, causing it to swing erratically. This can sometimes result in the existing thread separator failing to capture the bottom thread end, causing the bottom thread end to swing erratically. Consequently, the top thread cannot properly hook onto the bottom thread when sewing resumes next time, resulting in skipped stitches. This leads to poor performance stability of the sewing machine. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a thread divider structure for sewing machines. The technical problem this invention aims to solve is how to improve the stability of sewing machine performance.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A thread divider structure for a sewing machine includes a thread divider body, the thread divider body including a sheet-shaped mounting portion and a thread divider portion that is bent relative to the mounting portion, characterized in that an extension baffle is connected to the thread divider body, and a limiting groove for accommodating the thread ball is formed between the extension baffle and the thread divider portion of the thread divider body, the limiting groove having a limiting hook portion on one or both sides of the groove wall near the groove opening, and the limiting hook portion extending toward the opposite groove wall.

[0007] The innovative thread divider structure of this sewing machine features an extension baffle connected to the thread divider body. This extension baffle and the thread dividing section of the thread divider body form a limiting groove for accommodating the bobbin thread. Limiting hooks are provided on one or both sides of the groove opening to cover most of the opening. After thread cutting, the bobbin thread is confined within the limiting groove. This allows the thread divider body to smoothly capture the bobbin thread when it re-engages with the fixed blade under elastic action, preventing the bobbin thread from shifting position. This ensures that the top thread can properly hook onto the bobbin thread during the next sewing cycle, thereby improving the stability of the sewing machine's performance.

[0008] In the aforementioned sewing machine thread divider structure, the upper side of the limiting hook has a guide surface that slopes downwards from top to bottom, and the extended surface of the guide surface intersects with the groove wall of the limiting groove on the opposite side. Since one thread of the bottom thread and / or top thread enters from the dividing section side, when the limiting hook is located on the dividing section, the guide surface on the limiting hook can guide one thread of the bottom thread and / or top thread. When the limiting hook is located on the extension baffle, if one thread of the bottom thread or top thread swings to the extension baffle side due to external interference, the guide surface on the limiting hook can guide one thread of the bottom thread and / or top thread. The intersection of the extended surface of the guide surface with the groove wall of the limiting groove on the opposite side allows the groove wall of the limiting groove to act as a barrier, thus better guiding one thread of the bottom thread and / or top thread into the limiting groove when it reaches the seam.

[0009] In the aforementioned thread divider structure of a sewing machine, a gap is formed between the lower end of the guide wire surface and the groove wall of the opposite limiting groove for the sewing thread to enter. This gap allows one thread of the bobbin thread and one thread of the top thread to smoothly enter the limiting groove. After the bobbin thread and one thread of the top thread enter the limiting groove, the structure formed by the limiting hook, the extension baffle, and the thread divider, which encloses the groove with only a gap, effectively blocks the bobbin thread and top thread remaining in the limiting groove, preventing them from detaching. This restricts the position of the bobbin thread within a certain range, ensuring that the top thread can properly loop around the bobbin thread during the next sewing cycle, thereby improving the stability of the sewing machine's performance.

[0010] In the aforementioned sewing machine thread divider structure, the limiting groove is a cone shape, wider on the outside and narrower on the inside. The connection between the limiting hook and the groove wall, as well as the lower end of the limiting hook, are both arc-shaped. By setting the limiting groove to a cone shape, the bottom thread and top thread have sufficient room to move after entering the limiting groove. Simultaneously, due to the large space between the bottom thread and the groove opening, the bottom thread and top thread are less likely to slip out of the limiting groove through small gaps. Furthermore, the arc-shaped connection between the limiting hook and the groove wall, as well as the lower end of the limiting hook, prevent damage to the bottom thread and top thread.

[0011] In the aforementioned thread separator structure of a sewing machine, the extension baffle is integrally formed with the limiting hook, the thread separator has a thread separating tip for separating the thread, and the upper end of the guide surface is higher than the thread separating tip. During thread separation, the thread separating part of the thread separator body is used. After the thread enters the limiting groove, the limiting hook on the extension baffle can partially block the opening of the limiting groove, allowing the bottom thread to be better confined within the limiting groove. Furthermore, by setting the upper end of the guide surface higher than the thread separating tip, since one strand of the bottom thread or / and top thread enters from the thread separator side, when the bottom thread or top thread swings to the extension baffle side due to external interference, because the upper end of the guide surface is higher than the thread separating tip, the bottom thread or / and top thread will swing onto the guide surface and then smoothly enter the limiting groove along the guide surface, thus ensuring that the top thread can properly loop onto the bottom thread during the next sewing cycle, thereby improving the stability of the sewing machine's performance.

[0012] In the aforementioned sewing machine thread divider structure, the thread dividing portion of the thread dividing body is integrally formed with the limiting hook portion, and there is a gap between the limiting hook portion and the extension baffle. The upper end of the extension baffle is higher than the upper end of the limiting hook portion. During thread dividing, the guide surface of the limiting hook portion on the thread dividing portion can guide the sewing thread, facilitating its entry into the limiting groove. Simultaneously, the limiting hook portion can also partially block the opening of the limiting groove, allowing the bottom thread to be better confined within the limiting groove. Furthermore, the gap between the limiting hook portion and the extension baffle facilitates the entry of the sewing thread into the limiting groove. By setting the upper end of the extension baffle higher than the upper end of the limiting hook portion, the extension baffle can act as a barrier, preventing a single thread of the bottom thread and top thread from simultaneously crossing the limiting hook portion and the extension baffle, thus ensuring smooth entry into the limiting groove.

[0013] In the aforementioned sewing machine thread divider structure, both the extension baffle and the thread divider body have integrally formed limiting hooks on their dividing portions, with a gap between the two limiting hooks. By providing limiting hooks on both side walls at the opening of the limiting groove, the two limiting hooks can better limit the bottom thread and top thread within the limiting groove, preventing the bottom thread from detaching from the limiting groove and becoming misaligned. This better ensures that the top thread can properly align with the bottom thread during the next sewing cycle, thereby improving the stability of the sewing machine's performance.

[0014] In the aforementioned sewing machine thread divider structure, the extension baffle is integrally formed on the thread dividing portion of the thread divider body. By integrally forming the extension baffle onto the thread divider body, it is possible to manufacture the parts in a single step, while significantly improving the strength and durability of the components.

[0015] In the aforementioned sewing machine thread divider structure, the extension baffle is welded and fixed to the thread dividing portion of the thread divider body. By welding and fixing the extension baffle to the thread divider body, the structure after the two are connected has high strength and is not prone to excessive deformation under external force. At the same time, no additional connecting parts are required, and the weight of the two after connection is lighter.

[0016] In the aforementioned sewing machine thread divider structure, the extension baffle is stacked on the thread divider body. This structure allows the extension baffle to be manufactured separately from the thread divider, reducing manufacturing difficulty. Furthermore, both the extension baffle and the thread divider can be replaced if either is damaged.

[0017] Compared with existing technologies, the advantages of the thread divider structure of this sewing machine are as follows: The thread divider structure of this sewing machine creatively connects an extension baffle to the thread divider body, so that a limiting groove for accommodating the bobbin thread is formed between the extension baffle and the thread dividing part of the thread divider body. Furthermore, a limiting hook is provided on one side of the limiting groove, so that after the thread is cut, the bobbin thread is restricted within the limiting groove. This allows the thread divider body to smoothly capture the bobbin thread when it re-engages with the fixed blade under elastic action, preventing the bobbin thread from shifting position randomly. This ensures that the top thread can properly hook onto the bobbin thread when sewing begins again, thereby improving the stability of the sewing machine's performance. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the sewing machine in Embodiment 1, showing the extension baffle integrally formed on the sewing section.

[0019] Figure 2 This is a three-dimensional structural diagram of the thread divider structure of the sewing machine in Embodiment 1 from another angle.

[0020] Figure 3This is a three-dimensional structural diagram of the sewing machine in Embodiment 1, showing the extension baffle of the thread divider structure welded and fixed to the thread divider section.

[0021] Figure 4 This is a three-dimensional structural diagram of the thread divider structure of the sewing machine in Embodiment 2.

[0022] Figure 5 This is an exploded view of the thread divider structure of the sewing machine in Embodiment 3.

[0023] Figure 6 This is a three-dimensional structural diagram of the thread divider structure of the sewing machine in Embodiment 4.

[0024] In the figure, 1 is the splitter body; 1a is the mounting part; 1b is the splitter part; 1b1 is the splitter tip; 2 is the extension baffle; 3 is the limiting groove; 4 is the limiting hook; 4a is the conductor surface; and 5 is the gap. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] Example 1

[0027] A thread divider structure for a sewing machine, as shown in the reference. Figure 1 and Figure 2 The device includes a splitter body 1, which includes a sheet-shaped mounting portion 1a and a splitter portion 1b that is bent relative to the mounting portion 1a. The mounting portion 1a has a mounting hole. An extension baffle 2 is connected to the splitter body 1. A limiting groove 3 for accommodating the bottom wire is formed between the extension baffle 2 and the splitter portion 1b of the splitter body 1. The limiting hook portion 4 is integrally formed on the extension baffle 2 near the groove opening. The limiting hook portion 4 extends toward the splitter portion 1b. Specifically, the upper side of the limiting hook portion 4 has a guide surface 4a that is inclined downward from top to bottom, and the extended surface of the guide surface 4a intersects with the groove wall surface of the limiting groove 3 on the opposite side. Furthermore, the dividing part 1b has a dividing tip 1b1 for dividing the thread, the upper end of the conductor surface 4a is higher than the dividing tip 1b1, and a gap 5 for the sewing thread to enter is formed between the lower end of the conductor surface 4a and the groove wall of the opposite limiting groove 3. This gap 5 facilitates the entry of one thread of the bottom thread and the top thread loop into the limiting groove 3. The limiting groove 3 is a cone shape with a larger outer diameter and a smaller inner diameter. The connection between the limiting hook part 4 and the groove wall of the limiting groove 3, as well as the lower end of the limiting hook part 4, are both arc-shaped.

[0028] In this embodiment, the extended baffle 2 is preferably integrally formed or welded to the dividing part 1b of the dividing piece body 1.

[0029] Working principle: During thread cutting, the moving blade, carrying the bottom thread and top thread loop, moves towards the fixed blade. As the moving blade rotates, it continuously approaches the fixed blade, causing the dividing tip 1b1 of the dividing section 1b of the dividing plate body 1 to separate the two strands of the top thread loop. Subsequently, the moving blade enters between the fixed blade and the dividing plate body, pressing against the dividing section 1b of the dividing plate body 1 and deforming it downwards. This causes the dividing plate body 1 to move away from the fixed blade, and the moving blade and fixed blade engage to cut the thread. At the same time, one strand of the bottom thread and top thread loop also moves inwards on the dividing section 1b and moves through the gap 5 into the limiting groove 3. Because the gap 5 is small, a guide surface 4a is provided on the upper side of the limiting hook 4. When one strand of the bottom thread and / or top thread loop swings to the guide surface before passing through the gap 5... The guide surface 4a guides one thread of the bottom thread and / or top thread loop to move along the guide surface 4a, which is inclined downwards from top to bottom, into the limiting groove 3. The three-sided enclosing structure formed by the limiting hook 4, the extension baffle 2, and the thread separating part 1b can effectively block the bottom thread and top thread left in the limiting groove 3 to prevent them from leaving the limiting groove 3. After the thread is cut, the moving knife resets and leaves the fixed knife, and the thread end formed after the bottom thread is cut is left in the limiting groove 3. This allows the bottom thread left in the limiting groove 3 to be captured smoothly when the thread separating part 1 re-applies to the fixed knife under the action of elasticity. This ensures the stability of the bottom thread position after cutting, thereby ensuring that the top thread can properly wrap around the bottom thread when sewing for the next time, thus improving the stability of the sewing machine's performance.

[0030] Example 2

[0031] This embodiment is basically the same in structure and principle as Embodiment 1, except that: (Refer to...) Figure 4 The dividing part 1b of the dividing piece body 1 is integrally formed with the limiting hook part 4, and there is a gap between the limiting hook part 4 and the extension baffle 2. This gap facilitates the entry of one thread of the bottom thread and the top thread loop into the limiting groove 3. In this embodiment, it is preferable that the upper end of the extension baffle 2 is higher than the upper end of the limiting hook part 4. In this way, since one thread of the bottom thread and the top thread enters from the limiting hook part 4 side on the dividing part 1b, by setting the upper end of the extension baffle 2 to be higher than the upper end of the limiting hook part 4, the extension baffle 2 can play a blocking role, preventing one thread of the bottom thread and the top thread from passing through the limiting hook part 4 and the extension baffle 2 at the same time, so that they can smoothly enter into the limiting groove 3.

[0032] Example 3

[0033] This embodiment is basically the same in structure and principle as Embodiment 1 or Embodiment 2, except that: (Refer to...) Figure 5 The extended baffle 2 is stacked on the splitter body 1. It should be noted that, in specific implementations, the extended baffle 2 can be stacked either above or below the splitter body 1.

[0034] Example 4

[0035] This embodiment is basically the same in structure and principle as Embodiment 1, Embodiment 2, or Embodiment 3, except that: (Refer to...) Figure 6 The limiting hook 4 is integrally formed on the dividing portion 1b of both the extension baffle 2 and the dividing piece body 1, and there is a gap between the two limiting hooks 4. This gap facilitates the entry of one thread of the bottom thread and the top thread loop into the limiting groove 3. In specific implementation, the two limiting hooks 4 can be arranged opposite each other or staggered (not shown in the figure). In this embodiment, it is preferred that the upper end of the limiting hook 4 on the extension baffle 2 is higher than the upper end of the limiting hook 4 on the dividing portion 1b. On the one hand, one thread of the bottom thread and the top thread enters from the side of the limiting hook 4 on the dividing portion 1b. By setting the upper end of the limiting hook 4 on the extension baffle 2 to be higher than the upper end of the limiting hook 4 on the dividing portion 1b, the limiting hook 4 on the extension baffle 2 can play a blocking role, preventing the bottom thread and the top thread from entering. One thread passes through both limiting hooks 4 simultaneously, thus smoothly entering the limiting groove 3. On the other hand, the two staggered limiting hooks 4 form a double insurance. Even if the bobbin thread comes out of the first limiting hook 4, the second limiting hook 4 can block the bobbin thread. Moreover, the setting position of the second limiting hook 4 is exactly consistent with the direction in which the bobbin thread comes out of the first limiting hook 4, so as to better play the blocking role, so that the bobbin thread is still left in the limiting groove 3. This ensures that the top thread can properly wrap around the bobbin thread when starting to sew next time, thereby improving the stability of the sewing machine's performance.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A thread guide plate structure of a sewing machine comprising a thread guide plate body (1) including a mounting portion (la) in a plate shape and a thread guide portion (lb) in a bent shape with respect to the mounting portion (la), characterized in that, The extension blocking sheet (2) is connected to the thread separating sheet body (1), and a limiting groove (3) for accommodating a bottom thread is formed between the extension blocking sheet (2) and the thread separating part (1b) of the thread separating sheet body (1). The limiting groove (3) has a limiting hook part (4) on any one side or both sides of the groove wall near the slot, and the limiting hook part (4) extends towards the opposite groove wall.

2. The thread guide structure of a sewing machine according to claim 1, wherein The upper side of the limiting hook part (4) has a wire guide surface (4a) which is inclined downward from top to bottom, and the extension surface of the wire guide surface (4a) intersects with the groove wall surface of the opposite limiting groove (3).

3. The thread guide structure of a sewing machine according to claim 2, wherein The lower end of the wire guide surface (4a) and the groove wall surface of the opposite limiting groove (3) form a gap (5) for the entry of a sewing thread.

4. The thread guide structure of a sewing machine according to claim 3, wherein The limiting groove (3) is conical with a large outer diameter and a small inner diameter, and the connecting part of the limiting hook part (4) and the groove wall of the limiting groove (3) and the lower end of the limiting hook part (4) are both arc-shaped.

5. The thread guide structure of a sewing machine according to claim 2 or 3 or 4, wherein The limiting hook part (4) is integrally formed on the extension blocking sheet (2), the thread separating part (1b) has a thread separating tip (1b1) for thread separation, and the upper end of the wire guide surface (4a) is higher than the thread separating tip (1b1).

6. The thread guide structure of a sewing machine according to claim 1 or 2 or 3 or 4, wherein The limiting hook part (4) is integrally formed on the thread separating part (1b) of the thread separating sheet body (1), and there is a spacing between the limiting hook part (4) and the extension blocking sheet (2), and the upper end of the extension blocking sheet (2) is higher than the upper end of the limiting hook part (4).

7. The thread guide structure of a sewing machine according to claim 1 or 2 or 3 or 4, wherein The limiting hook part (4) is integrally formed on the thread separating part (1b) of the thread separating sheet body (1), and there is a spacing between the limiting hook part (4) and the extension blocking sheet (2), and the upper end of the extension blocking sheet (2) is higher than the upper end of the limiting hook part (4).

8. The thread guide structure of a sewing machine according to claim 1 or 2 or 3 or 4, wherein The extension blocking sheet (2) is integrally formed on the thread separating part (1b) of the thread separating sheet body (1).

9. The thread guide structure of a sewing machine according to claim 1 or 2 or 3 or 4, wherein The extension blocking sheet (2) is integrally formed on the thread separating part (1b) of the thread separating sheet body (1).

10. The thread guide structure of a sewing machine according to claim 1 or 2 or 3 or 4, wherein The extension blocking sheet (2) is integrally formed on the thread separating part (1b) of the thread separating sheet body (1).

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