Belt tensioner adjustment mechanism and sewing machine

Abstract

This utility model discloses a belt tensioner adjustment mechanism and a sewing machine, relating to the field of sewing equipment technology. To solve the problem of inconsistent and insufficient tension in the synchronous belt caused by manufacturing precision and long-term use, this belt tensioner adjustment mechanism is used to adjust the tension of the synchronous belt. It includes: a mounting plate; a tensioner wheel disposed on one side of the synchronous belt, movably mounted on the mounting plate via a stepped pin, and the tensioner wheel moving towards and away from the synchronous belt via the stepped pin to adjust the tension of the synchronous belt. This configuration allows for precise control of the synchronous belt tension, avoiding wear and breakage due to excessive tension and tooth skipping due to insufficient tension, thereby extending the service life of the synchronous belt and the equipment, improving overall stability and reliability, increasing the operating efficiency of the sewing machine, and ensuring consistent sewing quality.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and more specifically, to a belt tension wheel adjustment mechanism and a sewing machine. Background Technology

[0002] The wrist-mounted sewing machine is a type of arm-type double-thread loop sewing machine. Due to its unique cantilevered cylindrical structure, it is particularly suitable for overlapping sewing of cylindrical parts such as sleeves and trousers in products like shirts, windbreakers, jeans, and raincoats. However, in actual use, the timing belt, as a key component that drives the upper shaft to move the lower shaft, faces a series of technical challenges.

[0003] First, manufacturing precision issues during the splicing of the upper and lower sections of the machine housing make it difficult to accurately control the center distance between the upper and lower shafts. This results in inconsistent and significant fluctuations in the tension of the timing belt after installation. Specifically, when the timing belt tension is too low, skipped teeth will occur in the meshing between the timing pulley and the timing belt, severely affecting the stability and quality of sewing; while when the timing belt tension is too high, the timing belt will wear or even break due to excessive stretching, thus shortening the machine's service life.

[0004] Secondly, during long-term use of the wrist-wound sewing machine, the timing belt will gradually lose tension due to wear. This insufficient tension will lead to unstable meshing between the timing pulley and the timing belt, resulting in skipped teeth and abnormal noise, thus affecting the normal operation of the machine. In addition, insufficient tension can also cause uneven stitches and skipped stitches during sewing, reducing sewing quality and production efficiency.

[0005] Therefore, how to solve the problem of inconsistent and insufficient synchronous belt tension caused by manufacturing precision and long-term use is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a belt tensioner adjustment mechanism that can achieve precise control of the tension of the synchronous belt, avoid wear and breakage of the synchronous belt due to excessive tension, and tooth skipping due to insufficient tension, thereby extending the service life of the synchronous belt and equipment.

[0007] Another objective of this invention is to provide a sewing machine that includes the aforementioned belt tensioner adjustment mechanism, thereby improving the operating efficiency of the sewing machine and ensuring consistent sewing quality.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A belt tensioner adjustment mechanism for adjusting the tension of a timing belt, comprising:

[0010] Mounting plate;

[0011] The tension pulley is located on one side of the timing belt. It is movably mounted on the mounting plate via a stepped pin. The tension pulley moves along the direction closer to and further away from the timing belt via the stepped pin to adjust the tension of the timing belt.

[0012] Preferably, the tensioning wheel and the stepped pin are rotatably connected by a bearing, with the bearing installed inside the tensioning wheel and the stepped pin located inside the bearing.

[0013] Preferably, the bearing has retaining rings with holes at both ends.

[0014] Preferably, the stepped pin includes a first connecting part and a second connecting part that are coaxially arranged and connected to each other. The first connecting part is located inside the bearing, and the second connecting part is slidably arranged along the guide hole of the mounting plate. A fixing nut is provided at the end of the second connecting part away from the first connecting part.

[0015] Preferably, the diameter of the first connecting part is larger than the diameter of the second connecting part, and a limiting nut is provided at the junction of the first connecting part and the second connecting part, and a mounting groove for mounting a shaft retaining ring is provided at the end of the first connecting part away from the second connecting part.

[0016] Preferably, the mounting plate has an L-shaped structure, and the mounting plate includes a horizontal plate and a vertical plate arranged perpendicularly to each other. The vertical plate is provided with a guide hole extending in the height direction, and the horizontal plate is provided with at least two adjustment holes extending in the horizontal direction.

[0017] Preferably, a reinforcing plate is provided between the horizontal plate and the vertical plate.

[0018] Preferably, the outer surface of the tensioning wheel is provided with a wear-resistant coating.

[0019] A sewing machine includes a frame, on which a belt tensioner adjustment mechanism as described in any of the preceding claims is provided.

[0020] Preferably, a shock-absorbing pad is provided between the belt tensioner adjustment mechanism and the frame.

[0021] This utility model provides a belt tensioner adjustment mechanism for adjusting the tension of a synchronous belt. It includes a mounting plate and a tensioner. The mounting plate serves as the base component for supporting and fixing the tensioner, providing a stable mounting platform. The tensioner is located on one side of the synchronous belt, allowing direct contact with it. This ensures that the adjustment action directly acts on the synchronous belt, improving adjustment efficiency and accuracy. The tensioner is movably mounted on the mounting plate via a stepped pin. The stepped pin design allows the tensioner to move flexibly on the mounting plate, easily adjusting its position as needed. This achieves precise control of the synchronous belt tension. The tensioner moves along the direction closer to and further away from the synchronous belt via the stepped pin to adjust the belt tension. The movement of the stepped pin allows for precise position adjustment along the direction closer to or further away from the synchronous belt, thus achieving precise control of the synchronous belt tension. This avoids wear and breakage of the synchronous belt due to excessive tension, as well as skipping due to insufficient tension. This extends the service life of the synchronous belt and the equipment, improves overall stability and reliability, increases the operating efficiency of the sewing machine, and ensures consistent sewing quality.

[0022] The belt tensioner adjustment mechanism set up in the above manner can restore appropriate tension by adjusting the position of the tensioner, whether the initial tension is inconsistent due to insufficient manufacturing precision or the timing belt wear and tension reduction due to long-term use, ensuring that the timing belt is always in the best working condition. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the sewing machine provided by this utility model;

[0025] Figure 2 This is a schematic diagram of the belt tensioner adjustment mechanism provided by this utility model;

[0026] Figure 3 This is an exploded view of the belt tensioner adjustment mechanism provided by this utility model.

[0027] Figure label:

[0028] 10 - Synchronous belt; 20 - Frame; 30 - Driving pulley; 40 - Driven pulley;

[0029] 1-Mounting plate, 11-Guide hole, 12-Adjustment hole;

[0030] 2-Tensioner;

[0031] 3-Step pin;

[0032] 4-Bearings;

[0033] 5-Hole retaining ring;

[0034] 6-Fixing nut;

[0035] 7-Limit nut;

[0036] 8-Shaft retaining ring;

[0037] 9- Bolt. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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.

[0040] It should be noted that the directional terms such as "inner," "outer," "upper," and "lower" used below are defined based on the accompanying drawings in the instruction manual.

[0041] The core of this invention is to provide a belt tensioner adjustment mechanism that enables precise control of the tension of the synchronous belt 10, preventing wear and breakage of the synchronous belt 10 due to excessive tension, and tooth skipping due to insufficient tension, thereby extending the service life of the synchronous belt 10 and the equipment. Another core aspect of this invention is to provide a sewing machine including the aforementioned belt tensioner adjustment mechanism, improving the sewing machine's operating efficiency and ensuring consistent sewing quality.

[0042] Please refer to Figure 1 , Figure 2 and Figure 3 A belt tensioner adjustment mechanism is used to adjust the tension of the synchronous belt 10.

[0043] Specifically, the belt tensioner adjustment mechanism includes a mounting plate 1 and a tensioner 2. The mounting plate 1 serves as the base component supporting and fixing the tensioner 2, providing a stable mounting platform. The tensioner 2 is located on one side of the synchronous belt 10, allowing direct contact with it. This ensures that the adjustment action directly acts on the synchronous belt 10, improving the efficiency and accuracy of the adjustment. The tensioner 2 is movably mounted on the mounting plate 1 via a stepped pin 3. The design of the stepped pin 3 allows the tensioner 2 to move flexibly on the mounting plate 1, easily adjusting its position as needed to control the tension of the synchronous belt 10. Precise control is achieved by moving the tension wheel 2 closer to and further away from the synchronous belt 10 via the stepped pin 3 to adjust the tension of the synchronous belt 10. The movement of the stepped pin 3 allows the tension wheel 2 to be precisely adjusted in the direction of approaching or moving away from the synchronous belt 10, thus achieving precise control of the tension of the synchronous belt 10. This avoids wear and breakage of the synchronous belt 10 due to excessive tension, as well as tooth skipping due to insufficient tension. This extends the service life of the synchronous belt 10 and the equipment, improves overall stability and reliability, increases the operating efficiency of the sewing machine, and ensures consistent sewing quality.

[0044] The belt tensioner adjustment mechanism configured in the above manner can restore appropriate tension by adjusting the position of the tensioner 2, whether the initial tension is inconsistent due to insufficient manufacturing precision or the wear and tension reduction of the synchronous belt 10 due to long-term use, thus ensuring that the synchronous belt 10 is always in the best working condition.

[0045] In the above embodiment, the tensioning wheel 2 and the stepped pin 3 are rotatably connected by the bearing 4. The bearing 4 is installed inside the tensioning wheel 2, and the outer ring of the tensioning wheel 2 and the bearing 4 are tightly fitted together. The stepped pin 3 is installed inside the bearing 4, and the inner ring of the bearing 4 is tightly fitted together with the stepped pin 3.

[0046] It should be noted that the tensioning wheel 2 is rotatably connected to the stepped pin 3 via the bearing 4, ensuring that the tensioning wheel 2 can rotate smoothly and steadily during operation. The use of the bearing 4 significantly reduces the friction between the tensioning wheel 2 and the stepped pin 3, improves transmission efficiency, reduces energy loss, and thus extends the service life of the components.

[0047] In the above case, the bearing 4 is provided with retaining rings 5 ​​at both ends.

[0048] Understandably, the bearing 4 is equipped with retaining rings 5 ​​at both ends to effectively limit its axial movement, ensuring that it remains in the correct position during operation and preventing transmission instability or component damage caused by axial displacement. Precise axial limiting improves transmission stability. Furthermore, the design of the retaining rings 5 ​​simplifies the installation and maintenance of the bearing 4, allowing for quick installation or replacement without concern about axial misalignment, thus improving maintenance efficiency and reducing the risk of equipment failure due to improper installation.

[0049] Furthermore, the stepped pin 3 includes a first connecting part and a second connecting part that are coaxially arranged and connected to each other. The first connecting part is located inside the bearing 4, and the second connecting part is slidably arranged along the guide hole 11 of the mounting plate 1. A fixing nut 6 is provided at the end of the second connecting part away from the first connecting part.

[0050] It should be noted that the first connecting part is fixed inside the bearing 4, ensuring the stable rotation of the tensioning pulley 2, while the second connecting part slides along the guide hole 11 of the mounting plate 1, allowing the tensioning pulley 2 to move towards or away from the synchronous belt 10, providing high flexibility and allowing easy adjustment of the tension of the synchronous belt 10 according to actual needs. The tight fit between the first connecting part and the bearing 4 ensures the stability of the tensioning pulley 2 during operation, reducing tooth skipping or transmission instability caused by loose parts or vibration, thereby improving the reliability of the entire transmission. At the same time, the setting of the fixing nut 6 further enhances the stability of the stepped pin 3, preventing it from loosening during operation.

[0051] In the above embodiment, the diameter of the first connecting part is larger than the diameter of the second connecting part, and a limiting nut 7 is provided at the junction of the first connecting part and the second connecting part, and a mounting groove for mounting a shaft retaining ring 8 is provided at the end of the first connecting part away from the second connecting part.

[0052] Understandably, the diameter of the first connecting part is larger than that of the second connecting part, allowing the first connecting part to withstand a greater load. Since the first connecting part is directly connected to the bearing 4, the larger diameter provides stronger structural strength, reducing deformation or damage caused by external forces, thereby improving the reliability and durability of the entire adjusting mechanism. A limiting nut 7 is provided at the junction of the first and second connecting parts, effectively limiting the axial movement of the stepped pin 3. The end of the first connecting part away from the second connecting part has a mounting groove for installing the shaft retaining ring 8, allowing for easy installation and removal of the shaft retaining ring 8. The shaft retaining ring 8 is elastically deformed and snaps into the mounting groove, using its elastic restoring force to tightly adhere to the shaft surface, thus achieving axial fixation of the bearing 4. This design not only simplifies the assembly process but also improves assembly efficiency and reduces labor intensity. The mounting groove design of the shaft retaining ring 8 provides a 360° support surface, achieving uniform load distribution, reducing component damage caused by localized overload, and further improving the durability and reliability of the entire adjusting mechanism.

[0053] Based on the above embodiment, the mounting plate 1 has an L-shaped structure. The mounting plate 1 includes a horizontal plate and a vertical plate arranged perpendicularly to each other. The vertical plate is provided with a guide hole 11 extending in the height direction, and the horizontal plate is provided with at least two adjustment holes 12 extending in the horizontal direction.

[0054] It should be noted that the mounting plate 1 adopts an L-shaped structure, providing good structural support and enhancing the stability of the entire adjustment mechanism. It effectively disperses and withstands forces from different directions, reducing deformation or damage caused by external forces, thereby improving the durability and reliability of the adjustment mechanism. The vertical plate has guide holes 11 extending along the height direction, allowing the tensioning wheel 2 to move flexibly in the vertical direction via the stepped pin 3. Users can precisely adjust the position of the tensioning wheel 2 according to the actual tension requirements of the synchronous belt 10, thus achieving precise control of the tension of the synchronous belt 10. Specifically, when the tension of the synchronous belt 10 is too low, the stepped pin 3 slides upward along the guide hole 11, thereby driving the tensioning wheel 2 to move closer to the synchronous belt 10 to increase the tension of the synchronous belt 10; when the tension of the synchronous belt 10 is too high, the stepped pin 3 slides downward along the guide hole 11, thereby driving the tensioning wheel 2 to move away from the synchronous belt 10 to decrease the tension of the synchronous belt 10. This vertical adjustment capability is particularly important for dealing with tension changes caused by different models of synchronous belts 10 or long-term use.

[0055] Furthermore, the horizontal plate is provided with at least two adjustment holes 12 extending horizontally, allowing the mounting plate 1 to be fixed to the sewing machine frame 20 by bolts 9, and the horizontal position of the mounting plate 1 to be flexibly adjusted as needed. The design of multiple adjustment holes 12 provides more installation options, ensuring that the mounting plate 1 can adapt to different models of sewing machines or other equipment, and improving the adaptability and flexibility of the adjustment mechanism.

[0056] In one feasible implementation, by adding an eccentric wheel and an eccentric pin, it is unnecessary to drill a guide hole 11 on the mounting plate 1. The effect of adjusting the tension wheel 2 up and down can also be achieved by adjusting the angle of the eccentric wheel. Specific designs can be made according to actual conditions, and will not be elaborated here.

[0057] In the above embodiment, a reinforcing plate is provided between the horizontal plate and the vertical plate.

[0058] Understandably, a reinforcing plate is installed between the horizontal and vertical plates to enhance the overall structural strength of the mounting plate 1. The reinforcing plate effectively disperses and withstands forces from different directions, reducing deformation or damage caused by external forces, thereby improving the durability and reliability of the mounting plate 1. Especially under high loads or long-term operation, the reinforcing plate ensures the stability of the mounting plate 1.

[0059] As a preferred embodiment, the outer surface of the tensioning wheel 2 is provided with a wear-resistant coating.

[0060] It should be noted that the wear-resistant coating significantly improves the wear resistance of the tensioner 2, thereby reducing wear caused by long-term use. By increasing surface hardness and reducing friction, the wear-resistant coating effectively extends the service life of the tensioner 2. It also effectively reduces friction between the tensioner 2 and the timing belt 10, lowering material loss caused by frequent friction. This not only reduces the frequency of equipment maintenance but also lowers the cost associated with replacing parts.

[0061] In addition to the belt tensioner adjustment mechanism disclosed in the above embodiments, this utility model also provides a sewing machine including the above-mentioned belt tensioner adjustment mechanism, comprising a frame 20, on which a rotatable drive wheel 30 and a driven wheel 40 are provided, and a synchronous belt 10 is wound around the outside of the drive wheel 30 and the driven wheel 40. The structure of other parts of this sewing machine is described in the prior art and will not be repeated here.

[0062] Understandably, the sewing machine employs the aforementioned belt tensioner adjustment mechanism to ensure that the synchronous belt 10 maintains appropriate tension at all times. This reduces issues such as skipped stitches, slippage, or uneven transmission caused by inconsistent tension, significantly improving the sewing machine's transmission stability and ensuring a smooth and precise sewing process. Precise adjustment of the synchronous belt 10's tension reduces wear caused by excessive or insufficient tension, extending its lifespan and minimizing downtime due to belt damage, further extending the overall lifespan of the sewing machine. Stable transmission ensures even stitches and neat thread count, improving sewing quality. By reducing skipped stitches and thread breaks, the sewing machine can produce high-quality products to meet the needs of diverse customers.

[0063] In the above embodiment, a shock-absorbing pad is provided between the belt tensioner adjustment mechanism and the frame 20.

[0064] It should be noted that the vibration damping pads effectively absorb and isolate vibrations generated during operation. The elastic material of the damping pads buffers vibration energy, reducing the transmission of vibration to the frame 20 or other components, thereby significantly reducing the noise level during equipment operation. This not only provides a more comfortable working environment for operators but also reduces equipment damage caused by vibration. Furthermore, the vibration damping pads can reduce the positional misalignment of the tensioner 2 or the vibration of the timing belt 10 caused by vibration, thereby improving the stability of the entire transmission. By reducing vibration, the meshing between the timing belt 10 and the pulley is smoother, reducing tooth skipping or slippage and ensuring efficient transmission operation.

[0065] In summary, the belt tensioner adjustment mechanism provided by this utility model allows the lower shaft of the sewing machine to rotate, driving the drive wheel 30 to rotate, which in turn causes the synchronous belt 10 to drive the driven wheel 40 to rotate. A belt tensioner adjustment mechanism is located below the synchronous belt 10, with the tensioner 2 abutting against the outer side of the synchronous belt 10. The synchronous belt 10 drives the tensioner 2 to rotate, thus achieving power transmission. The stepped pin 3 can be adjusted up and down in the guide hole 11 of the mounting plate 1 to adjust the height of the tensioner 2. Adjusting it upwards increases the tension of the synchronous belt 10, and vice versa. An adjustment hole 12 is provided below the mounting plate 1, allowing for left and right adjustment of the tensioner 2 to match the synchronous belt 10. By adjusting the up and down movement of the tensioner 2 against the outer side of the synchronous belt 10, the synchronous belt 10 can be kept under appropriate tension, improving the stability and reliability of the transmission. The structure is simple and easy to install and adjust. Furthermore, by precisely adjusting the position of the tensioner 2, it is possible to ensure that the synchronous belt 10 always maintains appropriate tension, thereby reducing wear on the synchronous belt 10 caused by excessive or insufficient tension. This design not only extends the service life of the timing belt 10, but also reduces maintenance costs caused by frequent replacement of the timing belt 10.

[0066] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] The above provides a detailed description of the belt tensioner adjustment mechanism and sewing machine provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A belt tensioner adjustment mechanism for adjusting the tension of a synchronous belt (10), characterized in that, include: Mounting plate (1); The tension wheel (2) is located on one side of the synchronous belt (10). The tension wheel (2) is movably located on the mounting plate (1) via the step pin (3). The tension wheel (2) moves along the direction of approaching and moving away from the synchronous belt (10) via the step pin (3) to adjust the tension of the synchronous belt (10).

2. The belt tensioner adjustment mechanism according to claim 1, characterized in that, The tensioning wheel (2) and the step pin (3) are rotatably connected by a bearing (4). The bearing (4) is installed inside the tensioning wheel (2), and the step pin (3) is installed inside the bearing (4).

3. The belt tensioner adjustment mechanism according to claim 2, characterized in that, The bearing (4) has retaining rings (5) with holes at both ends.

4. The belt tensioner adjusting mechanism according to claim 3, characterized in that, The stepped pin (3) includes a first connecting part and a second connecting part that are coaxially arranged and connected to each other. The first connecting part is located inside the bearing (4). The second connecting part is slidably arranged along the guide hole (11) of the mounting plate (1). A fixing nut (6) is provided at the end of the second connecting part away from the first connecting part.

5. The belt tensioner adjusting mechanism according to claim 4, characterized in that, The diameter of the first connecting part is larger than the diameter of the second connecting part, and a limiting nut (7) is provided at the junction of the first connecting part and the second connecting part. The end of the first connecting part away from the second connecting part is provided with a mounting groove for mounting a shaft retaining ring (8).

6. The belt tensioner adjusting mechanism according to any one of claims 1-5, characterized in that, The mounting plate (1) has an L-shaped structure. The mounting plate (1) includes a horizontal plate and a vertical plate arranged perpendicularly to each other. The vertical plate is provided with a guide hole (11) extending in the height direction, and the horizontal plate is provided with at least two adjustment holes (12) extending in the horizontal direction.

7. The belt tensioner adjusting mechanism according to claim 6, characterized in that, A reinforcing plate is provided between the horizontal plate and the vertical plate.

8. The belt tensioner adjusting mechanism according to claim 7, characterized in that, The outer surface of the tensioning wheel (2) is provided with a wear-resistant coating.

9. A sewing machine, characterized in that, Includes a frame (20), on which a belt tensioner adjustment mechanism as described in any one of claims 1-8 is provided.

10. The sewing machine according to claim 9, characterized in that, A shock-absorbing pad is provided between the belt tensioner adjustment mechanism and the frame (20).

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