A multi-directional adjusting device for a rotating shaft balance block and a sewing machine

Abstract

The utility model provides a kind of pivot balance block multidirectional adjusting device and sewing machine, belong to the balance technical field of sewing machine shaft class.It solves how to improve the technical problem of the efficiency and precision of balance adjustment.This pivot balance block multidirectional adjusting device, sewing machine includes pivot, adjusting device includes fixed mechanism, angle adjusting mechanism, distance adjusting mechanism and balance block, fixed mechanism is fixedly connected with pivot, fixed mechanism can rotate synchronously with pivot, distance adjusting mechanism is connected with angle adjusting mechanism and is used to adjust the length of distance of the centroid of balance block and pivot axis line, angle adjusting mechanism is used to adjust the included angle between the vertical line of the centroid of balance block to pivot axis line and the vertical plane where pivot axis line is located.The balance block of the utility model can realize the multidirectional adjustment of counterweight angle and distance by distance adjusting mechanism and angle adjusting mechanism, so as to make pivot balance, greatly improve the adjusting efficiency and precision.

Description

Technical Field

[0001] This utility model belongs to the field of balancing technology for sewing machine shafts, and relates to a multi-directional adjustment device for a rotating shaft balance block and a sewing machine. Background Technology

[0002] The shafts of a sewing machine are the core components of transmission and motion control. A sewing machine typically consists of multiple shafts forming a power transmission system. These shafts usually rotate at high speeds and are connected to other moving mechanisms such as cranks, sliders, and connecting rods, resulting in complex force conditions and a high susceptibility to dynamic imbalance. This imbalance can trigger a series of NVH (noise, vibration, and harshness) problems in the sewing machine. There are two main existing methods for shaft dynamic balancing correction: 1. Dynamic balancing machine method: suitable for manufacturing or overhaul stages, correcting the balance through weight removal or addition. This method is complex and time-consuming, weight removal and addition are irreversible, and specialized equipment is expensive. 2. Trial weight method: suitable for assembled sewing machines, requiring no shaft disassembly and adjustment directly on the machine. This method is simpler to operate, and the shaft installation state matches the actual working conditions. However, the control precision is inaccurate, and there may be repetitions and omissions.

[0003] With the continuous improvement of sewing machine technology, the market has put forward higher requirements for the NVH performance of sewing machines. The dynamic balance of the shaft plays a key role in the vibration and noise of the whole machine. The existing dynamic balance correction scheme has low adjustment efficiency and accuracy, and cannot simultaneously achieve the adjustment of angle and distance. Summary of the Invention

[0004] This invention addresses the aforementioned problems in existing technologies by providing a multi-directional adjustment device for a rotating shaft balance block and a sewing machine. The technical problem this invention aims to solve is how to improve the efficiency and accuracy of balance adjustment.

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

[0006] A multi-directional adjustment device for a rotating shaft balance block, wherein the sewing machine includes a rotating shaft, characterized in that the adjustment device includes a fixing mechanism, an angle adjustment mechanism, a distance adjustment mechanism, and a balance block; the fixing mechanism is fixedly connected to the rotating shaft and can rotate synchronously with the rotating shaft; the angle adjustment mechanism is coaxially connected to the fixing mechanism; the distance adjustment mechanism is connected to the angle adjustment mechanism and is used to adjust the distance between the center of mass of the balance block and the axis of rotation; the angle adjustment mechanism is used to adjust the angle between the perpendicular line from the center of mass of the balance block to the axis of rotation and the vertical plane containing the axis of rotation.

[0007] Its working principle is as follows: The fixed mechanism is fixedly connected to the rotating shaft. The center of mass of the fixed mechanism is located on the rotating shaft. The rotating shaft coincides with the rotating shaft and the two are relatively stationary, which facilitates the adjustment of the angle and distance of the balance block. The angle adjustment mechanism can adjust the angle between the vertical line from the center of mass of the balance block to the center line of the rotating shaft and the vertical plane where the center line of the rotating shaft is located. The distance adjustment mechanism can adjust the distance from the center of mass of the balance block to the center line of the rotating shaft. The balance block can achieve multi-directional adjustment of the counterweight angle and distance through the distance adjustment mechanism and the angle adjustment mechanism, thereby balancing the rotating shaft and greatly improving the adjustment efficiency and accuracy.

[0008] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the fixing mechanism includes a fixing plate, the center of which has a shaft hole, the diameter of which is the same as the diameter of the rotating shaft, and a keyway is provided inside the shaft hole, and a mounting hole is provided inside the keyway.

[0009] The diameter of the shaft hole is the same as that of the rotating shaft, which ensures the concentricity of the fixing mechanism and the rotating shaft and avoids the generation of unbalanced forces. The keyway opened on the inner side of the shaft hole is used for the circumferential positioning of the fixing mechanism and the rotating shaft. The mounting hole is used to fasten the fixing mechanism to the rotating shaft with bolts, which can keep the two relatively stationary and make the fixing mechanism and the rotating shaft stably connected, greatly improving the adjustment accuracy.

[0010] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the fixing mechanism includes a first scale groove and several second scale grooves. The several second scale grooves are combined with the fixed plate to form a scale ruler structure with scale values. Both the first scale groove and the second scale groove are opened on the fixed plate.

[0011] The scale groove and scale structure are used to display the angle between the balance weight and the rotating shaft after adjustment.

[0012] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the angle adjustment mechanism includes an angle adjustment disk, an angle adjustment groove, and an angle adjuster. The inner side of the outer circular edge of the angle adjustment disk is provided with internal teeth, and the outer edge of the angle adjuster has external teeth that mesh with the internal teeth of the angle adjustment disk and are located in the angle adjustment groove. The angle adjuster has a threaded pin, and the angle adjuster is mounted on a fixed mechanism through the threaded pin and can rotate relative to the fixed mechanism.

[0013] The external teeth on the angle adjuster mesh with the internal teeth on the angle adjusting plate and are located in the angle adjusting groove, which can adjust the angle of the balance block. This adjustment method has high precision and can be repeatedly operated. The angle adjuster and the threaded pin can rotate relative to the fixed mechanism, thereby driving the angle adjusting plate to rotate and realize the adjustment of the angle of the balance block.

[0014] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the angle adjustment mechanism includes an inner disk with a second shaft hole, and the distance adjustment mechanism includes a guide rail connected to the balance block. The inner disk and the adjustment disk are connected via the guide rail, and the inner disk, the adjustment disk, and the guide rail are fixedly connected or are an integral structure.

[0015] Rotating the threaded pin drives the angle adjuster to rotate, which in turn drives the angle adjusting plate to rotate. This, in turn, drives the inner plate and guide rail, which are fixed to the angle adjusting plate, to rotate. The guide rail drives the balance block to rotate, causing the balance block to rotate relative to the axis of rotation, thus achieving the adjustment of the included angle.

[0016] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the adjustment mechanism includes a second shaft hole, and the fixing mechanism includes a boss. The outer diameters of the second shaft hole and the boss are the same. During installation, the boss is inserted into the second shaft hole.

[0017] The second shaft hole has the same outer diameter as the boss to ensure the concentricity of the angle adjustment mechanism and the fixing mechanism, and to avoid generating unbalanced forces.

[0018] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the inner disk is provided with an arc groove, and the fixing mechanism includes an angle fixing bolt. The arc groove abuts against the angle fixing bolt and can rotate relative to the fixing bolt.

[0019] The arc groove allows the angle fixing bolt to pass through it. After the angle adjustment is completed, the angle fixing bolt is used to lock the inner plate onto the fixing mechanism, thus achieving angle adjustment.

[0020] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the angle adjustment disk is provided with an angle indicator block, and the top of the angle indicator block has scale lines.

[0021] The scale lines on the angle indicator block correspond to the angle scale on the fixed disk, which is used to display the relative angle between the current balance block and the rotating shaft, thereby enabling the angle to be adjusted to balance the two.

[0022] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the fixing mechanism includes a second mounting hole, the threaded pin includes a column, one end of the column has an adjusting nut, the column is located on the second mounting hole and the column can rotate on the second mounting hole.

[0023] By adjusting the nut, the threaded pin and the angle adjuster rotate as a whole, thereby driving the angle adjusting plate to rotate. The second mounting hole is threadedly connected to the threaded pin on the angle adjuster, so that the angle adjustment mechanism can be stably connected to the fixed mechanism. When the angle adjustment mechanism rotates, the fixed mechanism remains relatively stationary, which improves the accuracy of angle adjustment.

[0024] In the aforementioned multi-directional adjustment device for a rotating shaft balance block, the distance adjustment mechanism includes a screw, which is threadedly connected to the balance block and to a guide rail. The screw can adjust the distance between the center of mass of the balance block and the axis of rotation.

[0025] The screw and the balance block are connected by a thread, which allows for more precise adjustment of the distance. By adjusting the depth to which the screw is screwed into the guide rail, the distance between the center of mass of the balance block and the axis of rotation can be adjusted, thereby achieving balance correction.

[0026] Another objective of this invention is to provide a sewing machine that includes a multi-directional adjustment device for the shaft balance block of any of the above-mentioned sewing machines.

[0027] Compared with the prior art, the advantages of this utility model are as follows:

[0028] 1. This multi-directional adjustment device for the rotating shaft balance block can adjust the angle between the vertical line from the center of mass of the balance block to the axis of rotation and the vertical plane containing the axis of rotation through the angle adjustment mechanism. It can also adjust the distance from the center of mass of the balance block to the axis of rotation through the distance adjustment mechanism and the angle adjustment mechanism. The balance block can achieve multi-directional adjustment of the counterweight angle and distance through the distance adjustment mechanism and the angle adjustment mechanism, thereby balancing the rotating shaft and greatly improving the adjustment efficiency and accuracy.

[0029] 2. This multi-directional adjustment device for the rotating shaft balance block drives the angle adjuster to rotate by rotating the threaded pin, which in turn drives the angle adjustment disk to rotate. Then, it drives the inner disk and guide rail, which are fixed to the angle adjustment disk, to rotate. The guide rail drives the balance block to rotate, so that the balance block rotates relative to the axis of the rotating shaft, thereby achieving the adjustment of the included angle.

[0030] 3. The multi-directional adjustment device of this rotating shaft balance block rotates as a whole with the adjustment nut, thereby driving the adjustment plate to rotate. The second mounting hole is threadedly connected to the threaded pin on the adjustment device, so that the angle adjustment mechanism can be stably connected to the fixed mechanism. When the angle adjustment mechanism rotates, the fixed mechanism remains relatively stationary, which improves the accuracy of angle adjustment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the multi-directional adjustment device for the rotating shaft balance block.

[0032] Figure 2 This is a structural diagram of the fixed mechanism.

[0033] Figure 3 This is a partial structural schematic diagram of the multi-directional adjustment device for the rotating shaft balance block.

[0034] Figure 4 This is a schematic diagram of the angle adjustment mechanism.

[0035] In the diagram: 1. Rotating shaft; 2. Fixing mechanism; 3. Angle adjustment mechanism; 4. Distance adjustment mechanism; 5. Balance block; 6. Fixing disc; 7. Shaft hole one; 8. Keyway; 9. Mounting hole one; 10. Scale groove one; 11. Scale groove two; 12. Angle adjusting disc; 13. Angle adjusting groove; 14. Angle adjuster; 15. Internal gear; 16. Threaded pin; 17. Shaft hole two; 18. Boss; 19. Arc groove; 20. Angle fixing bolt; 21. Angle indicator block; 22. Scale line; 23. Mounting hole two; 24. Guide rail; 25. Screw; 26. Inner disc; 27. Column; 28. Adjusting nut. Detailed Implementation

[0036] 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.

[0037] Example 1

[0038] like Figure 1 As shown, the sewing machine includes a rotating shaft 1, and the adjustment device includes a fixing mechanism 2, an angle adjustment mechanism 3, a distance adjustment mechanism 4, and a balance block 5. The fixing mechanism 2 is fixedly connected to the rotating shaft 1 and can rotate synchronously with the rotating shaft 1. The angle adjustment mechanism 3 is coaxially connected to the fixing mechanism 2. The distance adjustment mechanism 4 is connected to the angle adjustment mechanism 3 and is used to adjust the distance between the center of mass of the balance block 5 and the axis of the rotating shaft 1. The angle adjustment mechanism 3 is used to adjust the angle between the perpendicular line from the center of mass of the balance block 5 to the axis of the rotating shaft 1 and the vertical plane containing the axis of the rotating shaft 1. The fixing mechanism 2 is fixedly connected to the rotating shaft 1. The center of mass of the fixing mechanism is located on the rotating shaft, which coincides with the rotating shaft 1. The two are relatively stationary, which facilitates the adjustment of the angle and distance of the balance block. The angle adjustment mechanism 3 can adjust the angle between the vertical line from the center of mass of the balance block 5 to the axis of rotation 1 and the vertical plane containing the axis of rotation 1. The distance adjustment mechanism 4 can adjust the distance from the center of mass of the balance block 5 to the axis of rotation 1. The balance block 5 can achieve multi-directional adjustment of the counterweight angle and distance through the distance adjustment mechanism 4 and the angle adjustment mechanism 3, thereby balancing the rotating shaft 1 and greatly improving the adjustment efficiency and accuracy.

[0039] like Figure 1 and 2As shown, the fixing mechanism 2 includes a fixing disk 6. A shaft hole 7 is formed at the center of the fixing disk 6. The diameter of the shaft hole 7 is the same as the diameter of the rotating shaft 1. A keyway 8 is provided inside the shaft hole, and a mounting hole 9 is formed within the keyway 8. The diameter of the shaft hole 7 is the same as the diameter of the rotating shaft 1, ensuring the concentricity of the fixing mechanism 2 and the rotating shaft 1 and avoiding unbalanced forces. The keyway 8 inside the shaft hole is used for circumferential positioning of the fixing mechanism 2 and the rotating shaft 1. The mounting hole 9 is used to fasten the fixing mechanism 2 onto the rotating shaft 1 with bolts, maintaining relative stillness between the two and ensuring a stable connection between the fixing mechanism 2 and the rotating shaft 1, greatly improving the adjustment accuracy.

[0040] like Figure 2 As shown, the fixing mechanism 2 includes a first scale groove 10 and several second scale grooves 11. The several second scale grooves 11, together with the fixing plate 6, form a scale structure with scale values. Both the first scale groove 10 and the second scale grooves 11 are formed on the fixing plate 6. The first scale groove 10 and the scale structure are used to display the angle value between the balance block 5 and the rotating shaft 1 after adjustment.

[0041] like Figure 3 and 4 As shown, the angle adjustment mechanism 3 includes an angle adjustment disk 12, an angle adjustment groove 13, and an angle adjuster 14. The inner side of the outer edge of the angle adjustment disk 12 is provided with internal teeth 15. The outer edge of the angle adjuster 14 has external teeth that mesh with the internal teeth 15 of the angle adjustment disk 12 and are located within the angle adjustment groove 13. The angle adjuster 14 has a threaded pin 16, and is mounted on the fixed mechanism 2 via the threaded pin 16 and can rotate relative to the fixed mechanism 2. The external teeth on the angle adjuster 14, by meshing with the internal teeth 15 on the angle adjustment disk 12 and being located within the angle adjustment groove 13, can adjust the angle of the balance block 5. This adjustment method offers high precision and allows for repeated operation. The angle adjuster 14 and the threaded pin 16 can rotate relative to the fixed mechanism 2, thereby driving the angle adjustment disk 12 to rotate and achieve the adjustment of the angle of the balance block 5.

[0042] like Figures 2 to 4 As shown, the angle adjustment mechanism 3 includes an inner disk 26 with a shaft hole 17. The distance adjustment mechanism 4 includes a guide rail 24 connected to the balance block 5. The inner disk 26 and the adjustment disk 12 are connected via the guide rail 24. The inner disk 26, the adjustment disk 12, and the guide rail 24 are fixedly connected or are an integral structure. Rotating the threaded pin 16 drives the angle adjuster 14 to rotate, thereby driving the adjustment disk 12 to rotate. This, in turn, drives the inner disk 26 and the guide rail 24, which are fixedly connected to the adjustment disk 12, to rotate. The guide rail 24 drives the balance block 5 to rotate, causing the balance block 5 to rotate relative to the axis of rotation 1, thus adjusting the included angle.

[0043] like Figure 2 and 3As shown, the angle adjustment mechanism 3 includes a second shaft hole 17, and the fixing mechanism 2 includes a boss 18. The outer diameters of the second shaft hole 17 and the boss 18 are the same. During installation, the boss 18 is inserted into the second shaft hole 17. The fact that the outer diameters of the second shaft hole 17 and the boss 18 are the same is used to ensure the concentricity of the angle adjustment mechanism 3 and the fixing mechanism 2, and to avoid generating unbalanced forces.

[0044] like Figure 3 and 4 As shown, the inner plate 26 has an arc groove 19 inside. The fixing mechanism 2 includes an angle fixing bolt 20. The arc groove 19 abuts against the angle fixing bolt 20 and can rotate relative to the fixing bolt. The arc groove 19 allows the angle fixing bolt 20 to pass through it. After the angle adjustment is completed, the angle fixing bolt 20 is used to lock the inner plate 26 onto the fixing mechanism 2, thereby realizing the adjustment of the angle.

[0045] like Figure 4 As shown, the angle adjustment disk 12 is provided with an angle indicator block 21, and the top of the angle indicator block 21 has a scale line 22. The scale line 22 on the angle indicator block 21 corresponds to the angle scale on the fixed disk 6, which is used to display the current relative angle between the balance block 5 and the rotating shaft 1, thereby realizing the adjustment of the angle to balance the two.

[0046] like Figures 2 to 4 As shown, the fixing mechanism 2 includes a second mounting hole 23, and the threaded pin 16 includes a column 27. One end of the column 27 has an adjusting nut 28. The column 27 is located on the second mounting hole 23 and can rotate on the second mounting hole 23. By adjusting the adjusting nut 28, the threaded pin 16 and the angle adjuster 14 rotate as a whole, thereby driving the angle adjusting disk 12 to rotate. When the angle adjusting mechanism 3 rotates, the fixing mechanism 2 remains relatively stationary, improving the accuracy of angle adjustment.

[0047] like Figure 1 and 3 As shown, the distance adjustment mechanism 4 includes a screw 25, which is threadedly connected to the balance block 5 and the guide rail 24. The screw 25 can adjust the distance between the center of mass of the balance block 5 and the axis of rotation 1. The threaded connection between the screw 25 and the balance block 5 allows for more precise distance adjustment. By adjusting the depth to which the screw 25 is screwed into the guide rail 24, the distance between the center of mass of the balance block 5 and the axis of rotation 1 can be adjusted, thereby achieving balance correction.

[0048] Example 2

[0049] The general content of this embodiment is the same as that of embodiment 1, except that: in this embodiment, a sewing machine is provided, including the multi-directional adjustment device of the shaft balance block of any of the sewing machines in embodiment 1.

[0050] 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 multi-directional adjustment device for a rotating shaft counterweight, the sewing machine comprising a rotating shaft (1), characterized in that, The adjustment device includes a fixing mechanism (2), an angle adjustment mechanism (3), a distance adjustment mechanism (4), and a balance block (5). The fixing mechanism (2) is fixedly connected to the rotating shaft (1) and can rotate synchronously with the rotating shaft (1). The angle adjustment mechanism (3) is coaxially connected to the fixing mechanism (2). The distance adjustment mechanism (4) is connected to the angle adjustment mechanism (3) and is used to adjust the distance between the center of mass of the balance block (5) and the axis of the rotating shaft (1). The angle adjustment mechanism (3) is used to adjust the angle between the vertical line from the center of mass of the balance block (5) to the axis of the rotating shaft (1) and the vertical plane containing the axis of the rotating shaft (1).

2. The multi-directional adjustment device for a rotating shaft balance block according to claim 1, characterized in that, The fixing mechanism (2) includes a fixing plate (6), and a shaft hole (7) is provided in the center of the fixing plate (6). The diameter of the shaft hole (7) is the same as the diameter of the rotating shaft (1). A keyway (8) is provided inside the shaft hole, and an installation hole (9) is provided inside the keyway (8).

3. The multi-directional adjustment device for a rotating shaft balance block according to claim 2, characterized in that, The fixing mechanism (2) includes a first scale groove (10) and several second scale grooves (11). The several second scale grooves (11) are combined with the fixing plate (6) to form a scale ruler structure with scale values. The first scale groove (10) and the second scale grooves (11) are both opened on the fixing plate (6).

4. The multi-directional adjustment device for a rotating shaft balance block according to claim 1, characterized in that, The angle adjustment mechanism (3) includes an angle adjustment disk (12), an angle adjustment groove (13), and an angle adjuster (14). The inner side of the outer circle edge of the angle adjustment disk (12) is provided with internal teeth (15). The outer edge of the angle adjuster (14) has external teeth that mesh with the internal teeth (15) of the angle adjustment disk (12) and are located in the angle adjustment groove (13). The angle adjuster (14) has a threaded pin (16). The angle adjuster (14) is mounted on the fixed mechanism (2) through the threaded pin (16) and can rotate relative to the fixed mechanism (2).

5. A multi-directional adjustment device for a rotating shaft balance block according to claim 4, characterized in that, The angle adjustment mechanism (3) includes an inner disk (26) with a shaft hole (17) on it. The distance adjustment mechanism (4) includes a guide rail (24) connected to the balance block (5). The inner disk (26) and the angle adjustment disk (12) are connected through the guide rail (24). The inner disk (26), the angle adjustment disk (12) and the guide rail (24) are fixedly connected or are an integral structure.

6. The multi-directional adjustment device for a rotating shaft balance block according to claim 1, characterized in that, The angle adjustment mechanism (3) includes a second shaft hole (17), and the fixing mechanism (2) includes a boss (18). The outer diameter of the second shaft hole (17) and the boss (18) are the same. During installation, the boss (18) is inserted into the second shaft hole (17).

7. A multi-directional adjustment device for a rotating shaft balance block according to claim 5, characterized in that, The inner plate (26) has an arc groove (19) inside. The fixing mechanism (2) includes an angle fixing bolt (20). The arc groove (19) abuts against the angle fixing bolt (20) and can rotate relative to the fixing bolt. The angle adjusting plate (12) has an angle indicator block (21). The top of the angle indicator block (21) has a scale line (22).

8. A multi-directional adjustment device for a rotating shaft balance block according to claim 4, characterized in that, The fixing mechanism (2) includes a second mounting hole (23), the threaded pin (16) includes a column (27), one end of the column (27) has an adjusting nut (28), the column (27) is located on the second mounting hole (23) and the column (27) can rotate on the second mounting hole (23).

9. A multi-directional adjustment device for a rotating shaft balance block according to claim 5, characterized in that, The distance adjustment mechanism (4) includes a screw (25), which is threadedly connected to the balance block (5) and the guide rail (24). The screw (25) can adjust the distance between the center of mass of the balance block (5) and the axis of rotation (1).

10. A sewing machine, characterized in that, The sewing machine includes the multi-directional adjustment device for the spindle balance block as described in any one of claims 1-9.

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