Sewing machine vibration reduction structure and sewing machine
By employing rubber pad structures of varying hardness and inner protrusions with specific geometric shapes in the sewing machine, the problems of unbalanced vibration at the four corners and insufficient vibration isolation rate of the sewing machine are solved, thereby improving the overall vibration isolation rate and operational comfort, and reducing vibration levels.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG JACK SMART SEWING TECHNOLOGY CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-05-12
AI Technical Summary
Existing sewing machine vibration damping structures suffer from uneven vibration at the four corners and insufficient vibration isolation rate, resulting in noticeable vibration in the operator's hands, affecting comfort and sewing accuracy, and reducing machine lifespan.
The design employs rubber pads of varying hardness, with the head and tail rubber pads being 50-60HA and 70-80HA respectively. Combined with inner protrusions of a specific geometric shape, this enhances the vibration isolation performance of the rubber pads.
It improves the overall vibration isolation rate of the machine, reduces the discomfort of the operator when in contact with the sewing machine, ensures the physical and mental health of the user, reduces the machine vibration level, and improves the NVH performance of the sewing machine.
Smart Images
Figure CN224227409U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewing machine technology, specifically to a sewing machine vibration damping structure and a sewing machine. Background Technology
[0002] Flatbed sewing machines typically have a rated operating speed of 4000 rpm or higher. The torque generated by the motor is transmitted through transmission components to the thread take-up mechanism, feed dog mechanism, rotary hook mechanism, presser foot mechanism, and thread trimming mechanism, which perform the sewing action in a reciprocating cycle. Since the drive motor and moving mechanisms come into contact with the machine casing, the resulting vibrations are amplified on the casing. Because the bottom plate of the casing and the upper surface of the sewing table are not rigidly connected, the vibrations at their contact surface are amplified. If the table vibrates violently, the operator will experience noticeable vibrations in their hands, and prolonged exposure can be detrimental to physical and mental health. Furthermore, continuous and unstable vibrations can reduce sewing accuracy and shorten the machine's lifespan.
[0003] To avoid the adverse effects of sewing machine vibration, four rubber pads are typically used to isolate the machine casing and tabletop, buffering the vibration energy of the casing and reducing the vibration transmitted to the hands. However, the NVH (Noise, Vibration, and Harshness) performance of existing flatbed sewing machine vibration damping structures is relatively poor, especially in vibration isolation efficiency, which is generally below 90%. Furthermore, the tabletop vibration is noticeable at high speeds, resulting in a poor subjective NVH experience.
[0004] As the quality of sewing machines continues to improve, the market is placing higher demands on the comfort of sewing machines. Rubber pads play a key role in vibration transmission, and the vibration reduction performance of existing rubber pads urgently needs to be improved to enhance their overall vibration isolation efficiency and reduce the vibration level of the machine and the sewing machine table.
[0005] Therefore, how to improve the existing vibration damping structure of sewing machines, which has problems such as unbalanced vibration at the four corners and insufficient vibration isolation rate, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0006] In view of this, the purpose of this utility model is to provide a vibration damping structure for sewing machines to solve the problems of unbalanced vibration at the four corners and insufficient vibration isolation rate in existing sewing machine vibration damping structures.
[0007] The technical solution adopted in this utility model is: a sewing machine vibration damping structure, comprising:
[0008] A platform, wherein the platform is provided with a mounting groove;
[0009] A housing base plate, wherein the housing base plate is disposed within a mounting groove;
[0010] A head rubber pad is disposed between the head of the platform and the head of the base plate of the machine housing, and the hardness of the head rubber pad is 50-60HA.
[0011] A tail rubber pad is disposed between the tail of the platform and the tail of the machine housing base plate, and the hardness of the tail rubber pad is 70-80HA.
[0012] Preferably, the head rubber pad has a hardness of 55HA and the tail rubber pad has a hardness of 75HA.
[0013] Preferably, both the head rubber pad and the tail rubber pad include an upper boss and a lower column. The bottom end of the upper boss is fixedly connected to the top end of the lower column, and the outer surfaces of the upper boss and the lower column are coplanar. An inner protrusion strip is formed on the inner surface of the upper boss.
[0014] Preferably, the cross-sectional shape of the inner protrusion is trapezoidal, triangular, or semi-circular.
[0015] Preferably, the inner protrusions are linearly arranged on the inner side of the upper protrusion.
[0016] Preferably, the inner protrusions are arranged on the inner side of the upper protrusion in the form of intersecting lines or a dot matrix.
[0017] Preferably, a lower protrusion strip is provided on the lower bottom surface of the lower column.
[0018] Preferably, an upper protrusion strip is provided on the top surface of the lower column.
[0019] The second objective of this utility model is to provide a sewing machine that includes the above-mentioned sewing machine vibration damping structure.
[0020] The beneficial effects of this utility model are:
[0021] This invention improves the overall vibration isolation rate of the machine and enhances the stability of the sewing machine table by changing the structure and material properties of the rubber pad, thereby reducing the discomfort of the operator when in contact with the sewing machine and effectively ensuring the physical and mental health of the user. It also has the advantages of simple structure, low cost, and high economic practicality. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the vibration reduction structure for a sewing machine according to this utility model;
[0023] Figure 2 This is one of the structural schematic diagrams of a rubber pad;
[0024] Figure 3 This is the second schematic diagram of the rubber pad structure;
[0025] Figure 4 Vibration spectrum diagrams of the head rubber pad in the Z direction for existing technical solutions and the present application;
[0026] Figure 5 The image shows the vibration spectrum of the tail rubber pad in the Z direction compared to the existing technical solution and the present application.
[0027] Explanation of the reference numerals in the figure:
[0028] 1. Platform; 2. Base plate; 3. Head rubber pad; 3a. Front head rubber pad; 3b. Rear head rubber pad; 4. Tail rubber pad; 4a. Front tail rubber pad; 4b. Rear tail rubber pad;
[0029] 11. Upper boss; 12. Lower column; 13. Inner protrusion; 14. Lower protrusion; 15. Upper protrusion. Detailed Implementation
[0030] 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.
[0031] 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.
[0032] 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.
[0033] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0034] Examples, such as Figure 1 , Figure 2 and Figure 3 As shown, a vibration damping structure for a sewing machine includes a table plate 1, a machine housing base plate 2, a head rubber pad 3, and a tail rubber pad 4. An mounting groove (not shown) is formed on the table plate 1. The machine housing base plate 2 is installed within the mounting groove. The head rubber pad 3 is installed between the head of the table plate 1 and the head of the machine housing base plate 2, and the head rubber pad 3 has a hardness of 50-60 HA. The tail rubber pad 4 is installed between the tail of the table plate 1 and the tail of the machine housing base plate 2, and the tail rubber pad 4 has a hardness of 70-80 HA.
[0035] This invention improves the vibration isolation rate of the sewing machine's rear end in the vertical direction by setting the hardness of the head rubber pad 3 between the head of the table plate 1 and the head of the machine housing bottom plate 2 to 50-60HA, and the hardness of the tail rubber pad 4 between the tail of the table plate 1 and the tail of the machine housing bottom plate 2 to 70-80HA. It can also balance the vibration levels of the machine housing bottom plate 2 and the table plate 1, improve the vibration isolation rate on the horizontal plane, reduce the vibration of the table plate 1, and thus reduce the vibration of the entire machine.
[0036] Specific embodiment 1, such as Figure 1 , Figure 2 and Figure 3 As shown, a sewing machine vibration damping structure includes a table plate 1, a machine housing base plate 2, a head rubber pad 3, and a tail rubber pad 4.
[0037] An installation groove (not shown in the figure) is formed on the platform 1. The installation groove extends vertically through the platform 1, and stepped grooves are formed at the four corners of the installation groove.
[0038] The base plate 2 of the casing is installed in the mounting slot.
[0039] The head rubber pad 3 is installed between the head of the platform 1 and the head of the base plate 2. There are two head rubber pads 3, including a front head rubber pad 3a and a rear head rubber pad 3b. Both the front head rubber pad 3a and the rear head rubber pad 3b are installed between the head of the platform 1 and the head of the base plate 2. That is, both the front head rubber pad 3a and the rear head rubber pad 3b are installed in the stepped groove. The front head rubber pad 3a is located between the front of the head of the platform 1 and the front of the head of the base plate 2, and the rear head rubber pad 3b is located between the rear of the head of the platform 1 and the rear of the head of the base plate 2.
[0040] The front rubber pad 3a and the rear rubber pad 3b are made of nitrile rubber, and the hardness of the front rubber pad 3a and the rear rubber pad 3b is 50-60HA; preferably, the hardness of the front rubber pad 3a and the rear rubber pad 3b is 55HA.
[0041] The tail rubber pad 4 is installed between the tail of the platform 1 and the tail of the housing bottom plate 2. There are two tail rubber pads 4, including a front tail rubber pad 4a and a rear tail rubber pad 4b. Both the front tail rubber pad 4a and the rear tail rubber pad 4b are installed between the tail of the platform 1 and the tail of the housing bottom plate 2. That is, both the front tail rubber pad 4a and the rear tail rubber pad 4b are installed in the stepped groove. The front tail rubber pad 4a is located between the front of the tail of the platform 1 and the front of the tail of the housing bottom plate 2, and the rear tail rubber pad 4b is located between the rear of the tail of the platform 1 and the rear of the tail of the housing bottom plate 2.
[0042] The front tail rubber pad 4a and the rear tail rubber pad 4b are made of nitrile rubber, and the hardness of both the front tail rubber pad 4a and the rear tail rubber pad 4b is 70-80HA; preferably, the hardness of both the front tail rubber pad 4a and the rear tail rubber pad 4b is 75HA.
[0043] Specific embodiment 2, such as Figure 1 , Figure 2 and Figure 3 As shown, a sewing machine vibration damping structure includes a table plate 1, a machine housing base plate 2, a head rubber pad 3, and a tail rubber pad 4.
[0044] An mounting groove (not shown in the figure) is formed on the platform 1; the base plate 2 of the housing is installed in the mounting groove; the head rubber pad 3 is installed between the head of the platform 1 and the head of the base plate 2 of the housing, and the hardness of the head rubber pad 3 is 50-60HA; the tail rubber pad 4 is installed between the tail of the platform 1 and the tail of the base plate 2 of the housing, and the hardness of the tail rubber pad 4 is 70-80HA.
[0045] The head rubber pad 3 includes a front head rubber pad 3a and a rear head rubber pad 3b.
[0046] like Figure 3 The head front rubber pad 3a includes an integrally formed upper boss 11 and a lower column 12. The bottom end of the upper boss 11 is fixedly connected to the top end of the lower column 12, and the outer surfaces of the upper boss 11 and the lower column 12 are coplanar. An inner protrusion strip 13 is formed on the inner surface of the upper boss 11, a lower protrusion strip 14 is formed on the bottom surface of the lower column 12, and an upper protrusion strip 15 is formed on the top surface of the lower column 12.
[0047] The cross-sectional shape of the inner protrusion 13 is trapezoidal, triangular or semi-circular, and the inner protrusion 13 is linearly arranged on the inner side of the upper boss 11.
[0048] like Figure 2As shown, the head rear rubber pad 3b includes an integrally formed upper boss 11 and a lower column 12. The bottom end of the upper boss 11 is fixedly connected to the top end of the lower column 12, and the outer surfaces of the upper boss 11 and the lower column 12 are coplanar. An inner protrusion strip 13 is formed on the inner surface of the upper boss 11, a lower protrusion strip 14 is formed on the bottom surface of the lower column 12, and an upper protrusion strip 15 is formed on the top surface of the lower column 12.
[0049] The inner protrusion 13 is arranged on the inner side of the upper protrusion 11 in the form of intersecting lines or dot matrix.
[0050] The tail rubber pad 4 includes a front tail rubber pad 4a and a rear tail rubber pad 4b. The structure of the front tail rubber pad 4a is the same as that of the front head rubber pad 3a; the structure of the rear tail rubber pad 4b is the same as that of the rear head rubber pad 3b.
[0051] An example is a sewing machine that includes the above-described sewing machine vibration damping structure.
[0052] The existing rubber pads are all made of nitrile rubber, with a hardness of 55-65HA. Due to the unevenness of structural mass and stiffness, the stress conditions of the four rubber pads are different. Rubber pads with the same material properties cannot achieve a consistent vibration isolation rate, and the phenomenon of vibration imbalance is quite prominent.
[0053] As shown in Table 2.1, after analyzing the vibration test data (4000rpm) of several flat sewing machines at rated speed, it can be concluded that the vibration isolation rate of the two rear rubber pads 4 (front and rear) at the rear of the machine body is worse than that of the two head rubber pads 3 (front and rear) at the head of the machine body.
[0054] Table 2.1 Vibration isolation rate of rubber pads at different locations
[0055]
[0056] Analysis of sweep frequency vibration test data (0-4000rpm acceleration condition) of several flat sewing machines shows that the vibration of the rear rubber pad 4b at the tail end is greater than that of the rear rubber pad 3b at the head end. Furthermore, at high speeds, the vibration isolation efficiency of the rear rubber pad 4b at the tail end decreases significantly, reaching a maximum of -199%, indicating that the vibration at the table end is amplified by nearly 2 times.
[0057] As shown in Table 2.2, based on the rubber pad compression test data, the compression of the tail rubber pad 4 is greater than that of the head rubber pad 3, especially the deformation of the tail front rubber pad 4a is the largest.
[0058] Table 2.2 Compression of rubber pads at different locations
[0059] Rubber pad position Front of the head Back of head Front of the tail rear of the tail Compression amount (mm) 1.5 1.5 3.5 1.5
[0060] In summary, the analysis of the experimental data shows that the tail rubber pad 4 has a significant impact on the vibration performance of the platform 1 and the overall vibration isolation effect of the machine. Different material properties of the rubber pads can significantly affect the overall modal characteristics of the machine; selecting a suitable rubber pad material can achieve the desired modal target. By comparing the modal simulation data, it is found that the overall constraint modes are closely related to the dynamic stiffness of the rubber pads. Combined with the experimental results, when the dynamic stiffness of the tail rubber pad 4 is greater than that of the head rubber pad 3, the modal frequencies of the entire machine are correspondingly increased.
[0061] As shown in Table 2.3, the head rubber pad 3 with a hardness of 55HA and the tail rubber pad 4 with a hardness of 75HA were subjected to vibration tests at rated speed. Compared with the existing technology, the vibration isolation rate was significantly improved. The Z-direction vibration isolation efficiency of the tail rubber pad 4 was increased by nearly 100%, and the vibration level of the passive end of the head was reduced by nearly 40%.
[0062] Table 2.3 Comparison of vibration test data between the original and optimized schemes
[0063]
[0064] like Figure 4 and Figure 5 As shown, the head rubber pad 3 and the tail rubber pad 4 use a combination of materials with different hardness, which increases the overall vibration isolation rate compared to the original state and reduces the overall vibration acceleration to a certain extent. It also makes the vibration in each direction more balanced, which can effectively reduce the vibration of the whole machine. In particular, the vibration in the Z direction (vertical direction) is significantly optimized. The Z-direction vibration acceleration of the head rubber pad 3 and the tail rubber pad 4 is significantly attenuated in the frequency range of 2400Hz to 4000Hz, indicating that the vibration reduction scheme of this utility model can significantly improve the NVH performance of the sewing machine.
[0065] Compared with the prior art, the present invention has at least the following beneficial technical effects:
[0066] 1. Compared with the existing technology, this utility model changes the structure and material properties of the rubber pad of the sewing machine, which has a dual effect on improving the vibration isolation rate of the whole machine.
[0067] 2. Compared with the existing technology, the present invention makes less structural changes, only modifying the geometric dimensions of the rubber pad, and the base plate and platform of the casing do not need to be changed, resulting in lower optimization costs.
[0068] 3. Compared with the prior art, the materials selected in this utility model are common and readily available, the processing method is simple, the cost is low, and the economic practicality is high.
[0069] 4. Compared with the prior art, this utility model reduces the vibration of the passive end plate and effectively improves the stability of the plate.
[0070] 5. Compared with the prior art, this utility model can significantly reduce the discomfort of the operator when in contact with the sewing machine, and effectively protect the physical and mental health of the user.
[0071] 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 vibration damping structure for a sewing machine, characterized in that, include: A platform (1) is provided with an installation groove; The housing base plate (2) is set in the mounting groove; Head rubber pad (3), the head rubber pad (3) is disposed between the head of the platform (1) and the head of the base plate (2), and the hardness of the head rubber pad (3) is 50-60HA. Tail rubber pad (4) is provided between the tail of the platform (1) and the tail of the base plate (2), and the hardness of the tail rubber pad (4) is 70-80HA.
2. The sewing machine vibration damping structure according to claim 1, characterized in that, The head rubber pad (3) has a hardness of 55HA, and the tail rubber pad (4) has a hardness of 75HA.
3. A sewing machine vibration damping structure according to claim 1 or 2, characterized in that, Both the head rubber pad (3) and the tail rubber pad (4) include an upper boss (11) and a lower column (12). The bottom end of the upper boss (11) is fixedly connected to the top end of the lower column (12), and the outer surfaces of the upper boss (11) and the lower column (12) are coplanar. An inner protrusion strip (13) is formed on the inner surface of the upper boss (11).
4. The sewing machine vibration damping structure according to claim 3, characterized in that, The cross-sectional shape of the inner protrusion (13) is trapezoidal, triangular or semi-circular.
5. The sewing machine vibration damping structure according to claim 3, characterized in that, The inner protrusions (13) are arranged linearly on the inner side of the upper boss (11).
6. The sewing machine vibration damping structure according to claim 3, characterized in that, The inner protrusion strip (13) is arranged on the inner side of the upper protrusion (11) in the form of intersecting lines or dot matrix.
7. The sewing machine vibration damping structure according to claim 3, characterized in that, The lower column (12) has a lower protruding strip (14) on its lower bottom surface.
8. A sewing machine vibration damping structure according to claim 3, characterized in that, The upper top surface of the lower column (12) is provided with an upper protrusion strip (15).
9. A sewing machine, characterized in that, The sewing machine includes the sewing machine vibration damping structure according to any one of claims 1-8.