Sewing machine balancing device and sewing machine

Abstract

The utility model discloses a sewing machine balancing device and a sewing machine. The sewing machine balancing device comprises a thread passing seat shaft; the thread take-up crank is sleeved on the thread passing seat shaft; the balance assembly is connected with the thread take-up crank, and a height difference exists between the mass center of the balance assembly and the axis of the thread take-up crank; when the needle bar assembly connected with the thread passing seat shaft moves to the highest point, the thread take-up crank swings along with the thread passing seat shaft and enables the balance assembly to swing to the lowest point; when the needle bar assembly moves to the lowest point, the thread take-up crank swings along with the thread passing seat shaft and enables the balance assembly to swing to the highest point. According to the sewing machine, the balancing assembly is connected to the thread take-up crank, the unbalanced vertical inertia force generated when the needle rod assembly moves is counteracted through the inertia force generated by the balancing assembly, vibration of the whole sewing machine is reduced through balancing of the inertia force, mainly vibrating, of the needle rod assembly, and the working reliability and stability of the sewing machine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing equipment, and more specifically, to a sewing machine balance device. In addition, the utility model also relates to a sewing machine including the above sewing machine balance device. Background Art

[0002] Sewing machines are widely used in processing occasions such as clothing production, fabric art, and packaging. With the development of industry, the sewing speed of sewing machines is getting higher and higher, and the production efficiency is also getting higher and higher.

[0003] In the actual application process, due to the relatively fast movement speed of the moving parts inside the sewing machine, relatively large inertial forces will inevitably be generated. Whether this inertial force acts on the machine frame or forms an inertial moment, it will cause the machine to vibrate violently, resulting in wear of the moving parts and affecting the working accuracy and reliability of the machine.

[0004] In summary, how to reduce the vibration of the sewing machine during operation is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a sewing machine balance device, which can balance the unbalanced inertial force of the up and down movement of the needle bar assembly and the unbalanced inertial force along the axial direction, reduce the vibration of the machine, improve the reliable stability of the operation, and ensure the service life of each internal component. Another purpose of the utility model is to provide a sewing machine including the above sewing machine balance device.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A sewing machine balance device, comprising:

[0008] A thread passing seat shaft;

[0009] A thread take-up crank, sleeved on the thread passing seat shaft;

[0010] A balance assembly, connected to the thread take-up crank, and there is a height difference between the centroid of the balance assembly and the axis of the thread take-up crank;

[0011] When the needle bar assembly connected to the thread passing seat shaft moves to the highest point, the thread take-up crank swings with the thread passing seat shaft and makes the balance assembly swing to the lowest point;

[0012] When the needle bar assembly moves to the lowest point, the thread take-up crank swings with the thread passing seat shaft and makes the balance assembly swing to the highest point.

[0013] Preferably, one end of the thread passing seat shaft away from the thread take-up crank is connected to a thread passing seat, one end of the thread passing seat is connected to a thread take-up lever, and a counterweight is connected to the other end of the thread passing seat;

[0014] The center of gravity of the counterweight and the center of gravity of the thread take-up lever are located on both sides of the thread passing seat shaft.

[0015] Preferably, the counterweight includes a connecting portion connected to the thread passing seat and located on the top of the thread passing seat shaft, and the connecting portion is connected to a counterweight portion located on the side of the thread passing seat shaft.

[0016] Preferably, the connecting portion and the counterweight portion are integrally formed.

[0017] Preferably, the counterweight portion and the balance assembly are located on the same side of the thread passing seat shaft.

[0018] Preferably, the balance assembly includes a balance block, the balance block is connected to the outer periphery of the thread take-up crank through a connecting arm, and the balance block is connected to the end of the connecting arm in the length direction;

[0019] The axis of the thread take-up crank is located on the midline in the length direction of the connecting arm, and the line connecting the center of mass of the balance block and the axis of the thread take-up crank forms an angle with the midline in the length direction of the connecting arm.

[0020] Preferably, the end of the connecting arm is connected to the connecting portion of the balance block, and the connecting portion is arranged away from the center of gravity of the balance block.

[0021] Preferably, the balance block is of an arc structure, and a chamfer is provided on the arc structure.

[0022] Preferably, the thread take-up crank, the balance block, and the connecting arm are integrally formed.

[0023] The present invention also provides a sewing machine, including the sewing machine balance device according to any one of the above.

[0024] The sewing machine balancing device provided by the present utility model includes a thread passing base shaft and a thread taking-up crank sleeved on the thread passing base shaft. A balancing assembly is connected to the thread taking-up crank, and the thread passing base shaft is connected to the needle bar assembly. When the needle bar assembly swings, it can drive the swing of the thread passing base shaft connected thereto, and further drive the swing of the thread taking-up crank and the balancing assembly. There is a height difference between the centroid of the balancing assembly and the axis center of the thread taking-up crank. In the first case, when the needle bar assembly moves to the highest point, the thread taking-up crank swings with the thread passing base shaft and makes the balancing assembly swing to the lowest point. The downward component of the inertial force generated by the balancing assembly at the lowest point offsets the upward inertial force component generated by the needle bar assembly at the highest point. In the second case, when the needle bar assembly moves to the lowest point, the thread taking-up crank swings with the thread passing base shaft and makes the balancing assembly swing to the highest point. The upward component of the inertial force generated by the balancing assembly at the highest point offsets the downward inertial force component generated by the needle bar assembly at the lowest point.

[0025] The beneficial effects of the present utility model are as follows: By connecting a balancing assembly to the thread taking-up crank, the unbalanced up-and-down inertial force generated during the movement of the needle bar assembly is offset by the inertial force generated by the balancing assembly. By balancing the inertial force of the main vibrating needle bar assembly, the overall vibration of the sewing machine is reduced, and the reliable stability of the machine operation is improved.

[0026] In addition, since the thread passing base shaft of the sewing machine only swings up and down, connecting the balancing assembly to the thread passing base shaft through the thread taking-up crank will not generate front-back unbalanced inertial force, further ensuring the reliable stability during the overall operation of the sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a schematic application diagram of the sewing machine balancing device provided by the present utility model;

[0029] Figure 2 It is Figure 1 Another schematic diagram of the orientation;

[0030] Figure 3 It is a schematic structural diagram of the improved thread take-up lever assembly provided by the present utility model;

[0031] Figure 4 It is a schematic structural diagram of the thread take-up lever assembly before improvement provided by the present utility model;

[0032] Figure 5Schematic diagram of the structure of the balance assembly provided by the present utility model;

[0033] Figure 6 is Figure 5 front view;

[0034] Figure 7 X - direction test result diagram of the balance device provided by the present utility model;

[0035] Figure 8 Z - direction test result diagram of the balance device provided by the present utility model.

[0036] Figures 1 - 8 Among them, the reference numerals include:

[0037] 01 - needle bar assembly; 1 - upper front shaft; 2 - upper shaft balance weight; 3 - retaining ring; 4 - front sleeve; 5 - thread - passing seat shaft; 6 - thread - picking lever; 7 - thread - picking crank; 8 - lower needle bar sleeve; 9 - needle bar chuck; 10 - slider guide seat; 11 - needle bar slider; 12 - needle bar; 13 - needle bar connecting rod; 14 - upper needle bar sleeve; 15 - needle bar crank; 16 - thread - passing seat; 17 - thread - picking shaft connecting rod; 18 - thread - picking eccentric wheel; 19 - counterweight; 20 - balance assembly;

[0038] 191 - connecting part; 192 - counterweight part; 201 - connecting arm; 202 - balance weight. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] The core of the present utility model is to provide a sewing machine balance device, which can offset the unbalanced inertial force generated during operation, reduce the vibration of the machine, improve the reliable stability of the operation, and ensure the service life of each component inside the machine. Another core of the present utility model is to provide a sewing machine including the above - mentioned sewing machine balance device.

[0041] The sewing machine balance device provided by the present utility model includes a thread - passing seat shaft 5, a thread - picking crank 7, and a balance assembly 20. Please refer to Figure 1 , Figure 2 .

[0042] When the sewing machine is in operation, the upper front shaft 1 rotates to drive the needle bar crank 15 and the thread take-up eccentric wheel 18 connected thereto to rotate. The rotation of the needle bar crank 15 generates a force that is transmitted to the needle bar connecting rod 13. The needle bar connecting rod 13 is connected to the needle bar chuck 9. The needle bar 12 is fixed on the needle bar chuck 9 and is connected to the needle bar slider 11. The rotation of the needle bar crank 15 enables the needle bar slider 11 to move up and down along the slider guide 10, so as to realize the reciprocating up and down movement of the needle bar 12.

[0043] When the thread take-up eccentric wheel 18 rotates, it drives the thread take-up seat shaft 5 and the thread take-up seat 16 to swing up and down through the thread take-up shaft connecting rod 17. The thread take-up lever 6 connected to the thread take-up seat 16 swings up and down accordingly. To balance the inertial force generated during the movement of the thread take-up lever assembly and the needle bar assembly 01, a balance assembly 20 is connected to the thread take-up crank 7. The thread take-up lever assembly specifically includes the thread take-up seat shaft 5, the thread take-up seat 16, and the thread take-up lever 6. The needle bar assembly 01 specifically includes the needle bar 12, the needle bar slider 11, the needle bar chuck 9, the lower needle bar sleeve 8, the upper needle bar sleeve 14, etc.

[0044] Specifically, the thread take-up crank 7 is sleeved on the thread take-up seat shaft 5, and the balance assembly 20 is connected to the thread take-up crank 7. The connection here can be a detachable connection or a welded connection; it can also be that the balance assembly 20 and the thread take-up crank 7 are integrally formed.

[0045] There is a height difference between the center of mass of the balance assembly 20 and the axis center of the thread take-up crank 7, so that the swinging direction of the balance assembly 20 is opposite to the swinging direction of the needle bar assembly 01 during operation.

[0046] Specifically, when the needle bar assembly 01 connected to the thread take-up seat shaft 5 moves to the highest point, the thread take-up crank 7 swings with the thread take-up seat shaft 5 and makes the balance assembly 20 swing to the lowest point; when the needle bar assembly 01 moves to the lowest point, the thread take-up crank 7 swings with the thread take-up seat shaft 5 and makes the balance assembly 20 swing to the highest point.

[0047] The up and down unbalanced inertial force components generated by the swinging of the balance assembly 20 balance the unbalanced inertial force of the needle bar assembly and the thread take-up lever assembly in the up and down (Z-direction) movement. The unbalanced inertial force component along the axial direction (X-direction) of the upper front shaft 1 generated during the swinging process of the balance assembly 20 can balance the unbalanced inertial force component along the axial direction (X-direction) of the upper front shaft 1 generated by the up and down swinging of the thread take-up lever assembly, so as to cancel the unbalanced inertial force generated during the operation of the sewing machine, reduce the vibration of the machine, improve the reliable stability of the operation, and ensure the service life of each internal component.

[0048] By connecting the balance assembly 20 to the thread take-up crank 7, on the basis of balancing the unbalanced inertial force generated during the operation of the needle bar assembly 01 and the thread take-up lever assembly, the generation of unbalanced inertial force along the front and back directions and the axial direction of the upper front shaft 1 is avoided.

[0049] In this embodiment, the balancing component 20 may be block-shaped, arc-shaped, or elliptical. The shape and size of the balancing component 20 are determined by theoretical analysis combined with experimental analysis. The specific experimental analysis may be a combination of simulation and workshop test practice.

[0050] The above-mentioned balancing device can effectively balance the unbalanced inertial force generated by the needle bar assembly 01 and the thread take-up lever assembly, which are the main vibrating parts of the machine, thereby reducing the overall vibration of the sewing machine and improving the reliability and stability of the machine's operation.

[0051] On the basis of the above embodiment, the end of the thread passing seat shaft 5 away from the thread taking-up crank 7 is connected to the thread passing seat 16, one end of the thread passing seat 16 is connected to the thread taking-up rod 6, and the other end of the thread passing seat 16 is connected to a counterweight block 19;

[0052] The center of gravity of the counterweight block 19 and the center of gravity of the thread take-up lever 6 are located on both sides of the thread passing seat shaft 5, so as to achieve the effect of moving the center of gravity of the thread take-up lever assembly toward the axial center of the thread passing seat shaft 5.

[0053] Please refer to Figure 3 The end of the thread passing seat shaft 5 away from the thread taking-up crank 7 is connected to the thread passing seat 16, and a counterweight block 19 is connected to the thread passing seat 16, so that the center of gravity of the integral component composed of the counterweight block 19 and the thread taking-up rod assembly is close to the axis B of the thread passing seat shaft 5, the moment of inertia is smaller, and the unbalanced inertia force generated is also small, so as to further reduce the vibration of the machine.

[0054] like Figure 3 , Figure 4 As shown, the axis center close to the wire seat shaft 5 refers to the situation compared with the situation where the counterweight block 19 is not provided.

[0055] Figure 4 In the embodiment, no counterweight block 19 is added to the thread passing seat 16, and the distance between the center of gravity of the thread take-up lever assembly and the axis center of the thread passing seat shaft 5 is defined as L2; Figure 3 In the case where the counterweight 19 is connected to the thread passing seat 16, the distance between the center of gravity of the integral component composed of the counterweight 19 and the thread taking rod assembly and the axis of the thread passing seat shaft 5 is defined as L1. L2 is greater than L1, and the moment of inertia can be significantly reduced by adding the counterweight 19. After experimental verification, the scheme of adding the counterweight 19 can reduce the moment of inertia of the integral component composed of the counterweight 19 and the thread taking rod assembly by about 43%, which effectively reduces the vibration of the machine.

[0056] On the basis of adding the balancing assembly 20 and the counterweight 19, the operating performance of the balancing device under this scheme can be tested. Please refer to Figure 7 , Figure 8, it can be seen from the test curve that the vibration in the Y direction at the needle plate decreases and the vibration in the X direction increases slightly. That is, this solution can not only balance the unbalanced inertial force of the up-and-down movement (i.e., the Z direction) of the needle bar and thread take-up lever assembly, but also balance the unbalanced inertial force component in the axial direction parallel to the front upper shaft 1 (i.e., the X direction) generated during the swinging process of the thread take-up lever. At the same time, it will not increase the unbalanced inertial force in the front-back direction (i.e., the Y direction) and the axial direction, and has a good application effect.

[0057] After extracting and analyzing the data of the test curve, the reduction effect of the vibration in the Y direction at the needle plate is about 23%, and the increase in the vibration in the X direction is very small, indicating that the balance device provided by this application can significantly improve the vibration situation during the sewing machine operation, and can improve the working accuracy and reliability of the machine.

[0058] In this embodiment, it should be noted that the needle plate is specifically the component on which the inertial forces generated by the moving components such as the needle bar and thread take-up lever act during the sewing machine operation. By detecting the vibration amplitude of the needle plate, the application situation of the balance device can be analyzed.

[0059] On the basis of any of the above embodiments, the counterweight 19 includes a connecting portion 191 that connects the thread passing base 16 and is located at the top of the thread passing base shaft 5, and the connecting portion 191 connects the counterweight portion 192 located on the side of the thread passing base shaft 5.

[0060] Please refer to Figure 3 , the counterweight 19 specifically includes a connecting portion 191 and a counterweight portion 192 connected thereto, wherein the connecting portion 191 is connected to the thread passing base 16, which can be realized by hole position matching fasteners, so as to facilitate the selection and setting for assembly and disassembly effects.

[0061] The connecting portion 191 is connected to the counterweight portion 192. The connection here can be integrally formed, can be welded, or can be detachably connected, and can be flexibly selected according to the actual situation.

[0062] The connecting portion 191 is located at the top of the thread passing base shaft 5, and the counterweight portion 192 is located on the side of the thread passing base shaft 5, so as to Figure 3 be the reference. Specifically, the counterweight portion 192 is located on the right side of the thread passing base shaft 5, and the bottom plane of the counterweight portion 192 is lower than the axis of the thread passing base shaft 5, so that the counterweight portion 192 cooperates with the connecting portion 191 to play a counterweight role, making the distance between the center of gravity of the overall component composed of the counterweight 19 and the thread take-up lever assembly and the axis of the thread passing base shaft 5 smaller, reducing the unbalanced inertial force generated during the machine operation, and ensuring the stability of the machine operation.

[0063] On the basis of any of the above embodiments, the connecting portion 191 and the counterweight portion 192 are integrally formed, which is convenient for assembly and installation, improves the operation efficiency, and ensures the reliable operation strength and service life of the entire counterweight 19. Specifically, mass production of the counterweight 19 can be carried out by setting up a mold.

[0064] Based on any of the above embodiments, please refer to Figure 3 , the counterweight part 192 and the balance assembly 20 are located on the same side of the thread passing seat shaft 5. When the machine is in operation, the counterweight block 19 formed by the cooperation of the counterweight part 192 and the connecting part 191 reduces the unbalanced inertial force generated by the needle bar assembly 01 and the thread passing bar assembly, and the balance assembly 20 balances the unbalanced inertial force generated by the needle bar assembly 01 and the thread passing bar assembly, so as to achieve an effective balance and vibration reduction effect, ensure the service life of the moving parts in the machine by reducing the vibration of the machine, and improve the reliable safety of the operation.

[0065] Based on any of the above embodiments, please refer to Figure 5 , Figure 6 , the balance assembly 20 includes a balance block 202 and a connecting arm 201, and the balance block 202 and the connecting arm 201 can be integrally formed, detachably connected or welded.

[0066] The balance block 202 is connected to the outer periphery of the thread taking-up crank 7 through the connecting arm 201, and the balance block 202 is connected to the end of the connecting arm 201 in the length direction.

[0067] The thread passing seat shaft 5 and the thread taking-up crank 7 are coaxially arranged, and the axes of the thread passing seat shaft 5 and the thread taking-up crank 7 are both denoted as B.

[0068] The axis B of the thread taking-up crank 7 is located on the midline in the length direction of the connecting arm 201, and the line connecting the centroid A of the balance block 202 and the axis B of the thread taking-up crank 7 forms an angle with the midline in the length direction of the connecting arm 201, and this angle is an acute angle, which is specifically designed according to the actual situation. Taking Figure 6 and Figure 1 as an example, in this state, the centroid A of the balance block 202 is lower than the axis B of the thread taking-up crank 7.

[0069] In a specific application mode, the distance between the center of gravity C of the overall component formed by the balance assembly 20 and the thread taking-up crank 7 and the axis B of the thread taking-up crank 7 is 12.29 mm, and the angle between the midline in the length direction of the connecting arm 201 and the vertical direction is 78.44°, and the vertical direction here is the Y direction.

[0070] Based on any of the above embodiments, please refer to Figure 5 , the end of the connecting arm 201 is connected to the connecting part of the balance block 202, and the connecting part is arranged away from the center of gravity of the balance block 202. As shown in Figure 5 , the end of the connecting arm 201 is connected to the middle front direction on the side of the balance block 202. Through this setting, the swinging direction of the balance assembly 20 in the working state is opposite to the swinging direction of components such as the needle bar and the thread taking-up bar, so as to balance the unbalanced inertial force generated by the swinging of the components.

[0071] Based on any of the above embodiments, the balance weight 202 has an arc-shaped structure, and a chamfer is provided on the arc-shaped structure. Specifically, the arc-shaped structure is a semi-circular structure, and a chamfer is provided on the plane of the connecting portion of the semi-circular structure to ensure the safety of disassembly and assembly.

[0072] Based on any of the above embodiments, the thread take-up crank 7, the balance weight 202, and the connecting arm 201 are integrally formed, reducing the installation process and making the whole more beautiful. When applying the balance device in the above embodiments to a sewing machine, it is easy to install and has less modification to the original and more common sewing machines.

[0073] In addition to the above sewing machine balance device, the present utility model also provides a sewing machine including the sewing machine balance device disclosed in the above embodiments. Please refer specifically to Figure 1 and Figure 2 , a balance weight 2 is further provided on the upper front shaft 1 to balance the upper and lower unbalanced inertial forces. A retaining ring 3 is provided on the thread take-up shaft 5 to limit the thread take-up crank 7, and the front sleeve 4 is sleeved on the end of the thread take-up shaft 5 close to the thread take-up crank 7.

[0074] For the structures of other parts of this, please refer to the prior art and will not be elaborated herein.

[0075] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0076] The above has introduced in detail a sewing machine balance device and a sewing machine provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A balancing device for a sewing machine, characterized in that: include: Thread passing seat shaft (5); A thread taking-up crank (7) sleeved on the thread passing seat shaft (5); A balancing component (20) connected to the thread take-up crank (7), wherein there is a height difference between the center of mass of the balancing component (20) and the axis of the thread take-up crank (7); When the needle bar assembly (01) connected to the thread passing seat shaft (5) moves to the highest point, the thread taking-up crank (7) swings along with the thread passing seat shaft (5) and causes the balancing assembly (20) to swing to the lowest point; When the needle bar assembly (01) moves to the lowest point, the thread take-up crank (7) swings along with the thread passing seat shaft (5) and causes the balance assembly (20) to swing to the highest point.

2. The sewing machine balancing device according to claim 1, characterized in that: The end of the thread passing seat shaft (5) away from the thread taking-up crank (7) is connected to the thread passing seat (16), one end of the thread passing seat (16) is connected to the thread taking-up rod (6), and the other end of the thread passing seat (16) is connected to a counterweight (19); The center of gravity of the counterweight block (19) and the center of gravity of the thread take-up lever (6) are located on both sides of the thread passing seat shaft (5).

3. The sewing machine balancing device according to claim 2, characterized in that: The counterweight block (19) comprises a connecting portion (191) connected to the wire passing seat (16) and located at the top of the wire passing seat shaft (5), and the connecting portion (191) is connected to a counterweight portion (192) located at the side of the wire passing seat shaft (5).

4. The sewing machine balancing device according to claim 3, characterized in that: The connecting portion (191) and the counterweight portion (192) are integrally formed.

5. The sewing machine balancing device according to claim 4, characterized in that: The counterweight portion (192) and the balancing assembly (20) are located on the same side of the wire-passing seat shaft (5).

6. The sewing machine balancing device according to any one of claims 2 to 5, characterized in that: The balancing assembly (20) comprises a balancing block (202), wherein the balancing block (202) is connected to the outer periphery of the thread take-up crank (7) via a connecting arm (201), and the balancing block (202) is connected to an end portion of the connecting arm (201) in a length direction; The axis of the thread take-up crank (7) is located on the midline of the length direction of the connecting arm (201), and a line connecting the center of mass of the balancing block (202) and the axis of the thread take-up crank (7) forms an angle with the midline of the length direction of the connecting arm (201).

7. The sewing machine balancing device according to claim 6, characterized in that: The end of the connecting arm (201) is connected to the connecting portion of the balancing weight (202), and the connecting portion is arranged away from the center of gravity of the balancing weight (202).

8. The sewing machine balancing device according to claim 6, characterized in that: The balancing block (202) is an arc-shaped structure, and a chamfer is provided on the arc-shaped structure.

9. The sewing machine balancing device according to claim 6, characterized in that: The thread take-up crank (7), the balance block (202), and the connecting arm (201) are integrally formed.

10. A sewing machine, characterized in that: A sewing machine balancing device comprising the device described in any one of claims 1 to 9.

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