A low-vibration thread take-up linkage, a thread take-up mechanism for fabric piercing, and a sewing machine

Abstract

This utility model discloses a low-vibration thread take-up lever, a needle-punch thread take-up mechanism, and a sewing machine in the field of sewing machine technology. It includes a fixedly connected lever section and a counterweight section, with a rotation center hole provided at the connection point between the lever section and the counterweight section. By changing the mass distribution of the thread take-up lever, this utility model not only reduces the inertial force of the needle-punch thread take-up, thereby reducing overall machine vibration, improving the sewing experience, and enhancing product competitiveness, but also requires minimal modification to the thread take-up lever, keeping motion-related dimensions unchanged and not affecting sewing performance.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a low-vibration thread take-up linkage, a thread take-up mechanism, and a sewing machine. Background Technology

[0002] During the sewing process, the movement of the moving parts of a flatbed sewing machine generates inertial forces. These cyclical inertial forces are transmitted through various connected components, causing the entire machine to vibrate. This vibration can affect the sewing experience for the operator.

[0003] Therefore, how to effectively reduce the vibration of sewing machines caused by moving parts has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a low-vibration thread take-up linkage to address the above-mentioned technical problems, so as to reduce the vibration of the sewing machine caused by the thread take-up mechanism during the sewing process.

[0005] The technical solution adopted by this utility model is: a low-vibration line-carrying link, the line-carrying link including a fixedly connected link part and a counterweight part, and a rotation center hole is provided at the connection position of the link part and the counterweight part.

[0006] Preferably, the connecting rod includes a connecting end and a swing end, the connecting end is formed with a rotation center hole, and the reverse counterweight is distributed in a fan shape on the side of the connecting end away from the swing end.

[0007] Preferably, the center of mass of the line-picking link is located on the counterweight.

[0008] Preferably, the angle between the line connecting the center of mass of the line-taking link to the rotation center hole and the reverse extension of the line connecting the swing end to the rotation center hole is in the range of -5° to +5°.

[0009] Preferably, the center of mass of the line-picking link is located on the reverse extension line of the line connecting the swing end to the rotation center hole.

[0010] Preferably, the swing end is formed with a connecting shaft.

[0011] The second objective of this utility model is to provide a needle-punched fabric thread-taking mechanism, including the aforementioned thread-taking connecting rod and thread-taking lever. The thread-taking lever is rotatably connected to the thread-taking connecting rod, and the equivalent mass of the thread-taking lever at its swing end is m1, the distance from the swing end to the rotation center hole is r1, the mass of the connecting rod part is m2, the distance from the center of mass of the connecting rod part to the rotation center hole is r2, the mass of the counterweight part is m3, the distance from the center of mass of the counterweight part to the rotation center hole is r3, and m3×r3≤m1×r1+m2×r2.

[0012] A third objective of this utility model is to provide a sewing machine including the aforementioned thread-taking mechanism.

[0013] The beneficial effects of this utility model are:

[0014] This invention employs a reverse counterweight method, with a reverse counterweight fixedly connected to one end of the connecting rod. The rotation center hole is formed at the connection position between the connecting rod and the reverse counterweight. This allows the reverse counterweight to generate an inertial force opposite to that of the connecting rod during the reciprocating swing of the thread take-up rod, thereby balancing some of the inertial force generated by the thread take-up rod and reducing the vibration caused by the pierced fabric take-up mechanism. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the low-vibration line-taking link of this utility model;

[0016] Figure 2 This is a front view of the low-vibration line-taking link of this utility model;

[0017] Figure 3 This is one of the diagrams showing the position of the center of mass of the line-following link;

[0018] Figure 4 The second diagram shows the position of the center of mass of the line-following link.

[0019] Figure 5 This is a schematic diagram of the structure of the burr thread take-up mechanism of this utility model;

[0020] Figure 6 This is a schematic diagram of the existing barbed wire take-up mechanism;

[0021] Figure 7 Here is a simplified structural diagram of an existing barbed wire take-up mechanism;

[0022] Figure 8 This is a schematic diagram of the crank-rocker mechanism.

[0023] Explanation of the reference numerals in the figure:

[0024] 100. Line-lifting linkage;

[0025] 110. Connecting rod section; 111. Connecting end; 112. Swinging end; 113. Connecting shaft; 120. Reverse counterweight section; 130. Rotation center hole;

[0026] 200. Line-lifting pole;

[0027] 300. Needle bar crank;

[0028] 400. Wire take-up drive shaft for barbed fabric;

[0029] 500. Needle bar connecting rod;

[0030] 600. Needle bar. Detailed Implementation

[0031] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0032] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] Through long-term research, the inventors discovered that sewing machines include a needle-and-thread take-up mechanism, a feed dog mechanism, and a rotary hook mechanism. Among these, the needle-and-thread take-up mechanism has the largest stroke and the greatest impact on the vibration value of the entire machine.

[0036] like Figure 6 , Figure 7 and Figure 8 As shown, ABFH completes the needle-punching action, and ABCDE completes the thread-taking action. These two actions are independent and share the same needle bar crank (the needle bar crank is AB bar, and the thread-taking linkage is CD bar). Based on the structure of ABCD, it can be seen that the thread-taking mechanism is a four-bar linkage. Figure 8 It can be seen that point B is in circular motion, point C is oscillating around a circle, and points C1 and C2 are the extreme positions of the oscillation. Both motions will generate inertial force, which will be transmitted through various connecting mechanisms.

[0037] Examples, such as Figures 1-8As shown, a low-vibration line-lifting link 100 includes a link portion 110 and a counterweight portion 120 that are fixedly connected, and a rotation center hole 130 is provided at the connection position of the link portion 110 and the counterweight portion 120.

[0038] This invention employs a reverse counterweight method, with a reverse counterweight 120 fixedly connected to one end of the connecting rod 110, and a rotation center hole 130 formed at the connection position between the connecting rod 110 and the reverse counterweight 120. This allows the reverse counterweight 120 to generate an inertial force opposite to that of the connecting rod 110 during the reciprocating swing of the thread take-up rod 100, which can balance part of the inertial force generated by the thread take-up rod 100, thereby reducing the vibration caused by the thread take-up mechanism.

[0039] Specific embodiment 1, such as Figures 1-8 As shown, a low-vibration line-lifting link 100 includes a link portion 110 and a counterweight portion 120 that are fixedly connected.

[0040] The connecting rod 110 includes a connecting end 111 and a swing end 112. That is, one end of the connecting rod 110 is the connecting end 111, and the other end of the connecting rod 110 is the swing end 112. A rotation center hole 130 is formed in the connecting end 111. The reverse counterweight is integrally formed in the connecting end 111 of the connecting rod 110. The reverse counterweight 120 is generally distributed in a fan shape to facilitate the reciprocating swing of the line-lifting connecting rod 100. The reverse counterweight 120 is fixedly connected to the side of the connecting end 111 away from the swing end 112, so that the center of mass of the reverse counterweight 120 and the center of mass of the connecting rod 110 are located on both sides of the rotation center hole 130.

[0041] Preferred, such as Figure 3 As shown, the center of mass P of the line-fetching link 100 is located on the counterweight part 120, that is, the center of mass P of the entire line-fetching link 100 is located on the counterweight part 120, so as to balance the inertial force generated by the equivalent mass of the line-fetching rod 200 acting on the swing end 112.

[0042] More preferably, such as Figure 3 As shown, the angle between the line connecting the center of mass of the line-fetching link 100 to the rotation center hole 130 and the reverse extension of the line connecting the swing end 112 to the rotation center hole 130 is -5° to +5°. That is, the line connecting the center of mass of the line-fetching link 100 to the rotation center hole 130 is line DP, and the line connecting the swing end of the link 110 to the rotation center hole 130 is line DC. The angle between the reverse extensions of line DP and line DC is -5° to +5°.

[0043] Preferably, the center of mass of the line-flipping link 100 is located on the reverse extension line of the line connecting the swing end 112 to the rotation center hole 130.

[0044] A connecting shaft 113 is formed at the swing end 112 of the connecting rod portion 110.

[0045] Examples, such as Figure 4 and Figure 5 As shown, a needle bar thread take-up mechanism includes the aforementioned thread take-up connecting rod 100, thread take-up rod 200, needle bar crank 300, needle bar thread take-up drive shaft 400, needle bar connecting rod 500, and needle bar 600. The thread take-up connecting rod 100 is rotatably connected to the machine housing via a connecting pin, and the swing end of the thread take-up connecting rod 100 is rotatably connected to the thread take-up rod 200. The needle bar crank 300 is mounted on the upper shaft, and the needle bar crank 300 is fixedly connected to the first shaft portion at one end of the needle bar thread take-up drive shaft 400. The bottom end of the thread take-up rod 200 is connected to the first shaft portion. The top end of the needle bar connecting rod 500 is rotatably connected to the second shaft portion at the other end of the needle bar thread take-up drive shaft 400, and the bottom end of the needle bar connecting rod 500 is connected to the needle bar 600.

[0046] The equivalent mass of the lifting rod 200 at the swing end 112 is m1, the distance from the swing end 112 to the rotation center hole 130 is r1, the mass of the connecting rod part 110 is m2, the distance from the center of mass of the connecting rod part 110 to the rotation center hole 130 is r2, the mass of the counterweight part 120 is m3, the distance from the center of mass of the counterweight part 120 to the rotation center hole 130 is r3, and m3×r3≤m1×r1+m2×r2.

[0047] An example is a sewing machine that includes the above-described needle-and-thread take-up mechanism.

[0048] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0049] This invention reduces the inertial force of the thread take-up lever by changing its mass distribution, thereby reducing the vibration of the whole machine, improving the sewing experience, and enhancing the competitiveness of the product. Moreover, the thread take-up lever is only slightly modified, the motion-related dimensions remain unchanged, and the sewing performance is not affected.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A low-vibration thread take-up link, characterized by, The line-picking link (100) includes a link section (110) and a counterweight section (120) that are fixedly connected, and a rotation center hole (130) is provided at the connection position of the link section (110) and the counterweight section (120).

2. The low-vibration line-picking link according to claim 1, characterized in that, The connecting rod (110) includes a connecting end (111) and a swing end (112). The connecting end (111) is formed with a rotation center hole (130). The counterweight (120) is distributed in a fan shape on the side of the connecting end (111) away from the swing end (112).

3. A low-vibration line-picking link according to claim 2, characterized in that, The center of mass of the line-picking link (100) is located on the counterweight (120).

4. A low-vibration line-picking link according to claim 3, characterized in that, The angle between the line connecting the center of mass of the line-flying link (100) to the center hole of rotation (130) and the reverse extension of the line connecting the swing end (112) to the center hole of rotation (130) is -5° to +5°.

5. A low-vibration line-picking link according to claim 4, characterized in that, The center of mass of the line-picking link (100) is located on the reverse extension of the line connecting the swing end (112) to the rotation center hole (130).

6. A low-vibration line-picking link according to claim 1, characterized in that, The swing end (112) is formed with a connecting shaft (113).

7. A needle-punched fabric thread-taking mechanism, characterized in that, Includes the line-lifting connecting rod (100) and line-lifting rod (200) as described in any one of claims 1-6, wherein the line-lifting rod (200) is rotatably connected to the line-lifting connecting rod (100), and the equivalent mass of the line-lifting rod (200) at the swing end (112) is m1, the distance from the swing end (112) to the rotation center hole (130) is r1, the mass of the connecting rod part (110) is m2, the distance from the center of mass of the connecting rod part (110) to the rotation center hole (130) is r2, the mass of the reverse counterweight part (120) is m3, the distance from the center of mass of the reverse counterweight part (120) to the rotation center hole (130) is r3, and m3×r3≤m1×r1+m2×r2.

8. A sewing machine, characterized in that, Includes the needle-punched fabric take-up mechanism as described in claim 7.

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