Belt pulley tensioning device for embroidery frame of embroidery machine

Abstract

The utility model relates to embroidery machine technical field, specifically discloses a kind of belt pulley tensioner of embroidery frame of embroidery machine, including base, recess is set in the top of base, and tensioning assembly is arranged on base, and tensioning assembly includes screw rod, and the inner cavity of recess is sleeved in screw rod, and one end of screw rod is provided with turntable, and the surface of screw rod is connected with screw sleeve with screw thread, the surface of screw sleeve is connected with screw sleeve, the top of screw sleeve is fixedly connected with recessed plate, and the inner cavity of recessed plate is rotatably connected with belt pulley, and the both ends of recessed plate bottom are equipped with guide block. Tensioning adjustment is realized by the thread cooperation of screw rod and screw sleeve, and the sliding limiting structure of guide block and guide groove is combined, so that adjustment can be quickly completed without the aid of external tools, and the position of turntable is locked by the cooperation of clamping rod and clamping hole in positioning assembly, effectively prevent the change of tensioning degree due to vibration or long-term use, with the advantages of convenient operation, high adjustment efficiency and good tensioning stability.

Description

Technical Field

[0001] This utility model relates to the field of embroidery machine technology, specifically to a belt pulley tensioning device for an embroidery machine frame. Background Technology

[0002] The belt pulleys of embroidery machine frames require periodic tension adjustment during use, but traditional tensioning devices present significant operational inconveniences. In existing technologies, most tensioning devices require external tools for adjustment, increasing the workload for operators and reducing efficiency. This is particularly problematic in situations requiring frequent adjustments, where repeated tool use leads to cumbersome procedures and severely impacts machine maintenance efficiency. Furthermore, traditional devices lack effective positioning mechanisms after adjustment, making them susceptible to tension changes due to machine vibration or prolonged use, thus affecting the machine's operational stability and embroidery precision. These technical deficiencies are especially pronounced in production environments demanding high-precision embroidery, often resulting in inconsistent embroidery quality. Therefore, improvements to existing technologies are urgently needed to address these issues. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a belt pulley tensioning device for an embroidery machine frame, which has the advantages of convenient operation, high adjustment efficiency, and good tensioning stability.

[0004] This application provides a belt pulley tensioning device for an embroidery machine frame, the technical solution of which is as follows: The device includes a base with a groove on its top. A tensioning assembly is installed on the base, including a screw that is fitted inside the groove. A turntable is installed at one end of the screw, and a threaded sleeve is threaded onto the surface of the screw. A threaded sleeve is threaded onto the surface of the threaded sleeve, and a concave plate is fixedly connected to the top of the threaded sleeve. A pulley is rotatably connected to the inner cavity of the concave plate. Guide blocks are provided at both ends of the bottom of the concave plate, and guide grooves that match the guide blocks are provided on both sides of the top of the base.

[0005] Furthermore, this application also proposes that a positioning component is provided on the left side of the front of the base. The positioning component includes a movable box, which is located on the front of the base. A locking rod is movably fitted inside the cavity of the movable box. A push plate is fixedly fitted on the surface of the locking rod, which is located inside the cavity of the movable box. A spring is provided at the connection between the left side of the push plate and the movable box, and the spring is fitted on the surface of the locking rod. A pull plate is provided at one end of the locking rod, and a locking hole adapted to the other end of the locking rod is opened on the surface of the turntable.

[0006] Furthermore, this application also proposes that the number of card holes is not less than eight, and that the eight card holes are equally spaced on the surface of the turntable.

[0007] Furthermore, this application also proposes that limiting plates are fixedly fitted on both sides of the surface of the active box, and one end of the limiting plate is fixedly connected to the base.

[0008] Furthermore, this application also proposes that one end of the screw is movably fitted with a movable shaft, and one end of the movable shaft is disposed on the inner wall of the groove.

[0009] Furthermore, this application also proposes that mounting plates are fixedly connected to both ends of both sides of the base, and mounting holes are provided in the inner cavity of the mounting plates.

[0010] As can be seen from the above, the belt pulley tensioning device and its positioning component for an embroidery frame provided in this application achieve tension adjustment through the threaded engagement of the screw and the screw sleeve. Combined with the sliding limit structure of the guide block and the guide groove, the adjustment can be completed quickly without the aid of external tools. The position of the turntable is locked by the engagement of the locking rod and the locking hole in the positioning component, which effectively prevents the tension from changing due to vibration or long-term use. It has the advantages of convenient operation, high adjustment efficiency and good tension stability. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the tensioning component structure of this utility model; Figure 3 This is a schematic diagram of the screw structure of this utility model; Figure 4 This is a schematic diagram of the positioning component structure of this utility model; Figure 5 This is a partial cross-sectional view of the movable box of this utility model.

[0012] In the diagram: 1. Base; 2. Groove; 3. Tensioning assembly; 301. Screw; 302. Screw sleeve; 303. Concave plate; 304. Pulley; 305. Guide block; 306. Turntable; 307. Locking hole; 308. Movable shaft; 4. Guide groove; 5. Mounting plate; 6. Positioning assembly; 601. Movable box; 602. Locking rod; 603. Limiting plate; 604. Pull plate; 605. Spring; 606. Push plate. Detailed Implementation

[0013] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0014] Please see Figure 1-5 In existing technologies, the 304 stainless steel tensioning device for the embroidery frame pulley of embroidery machines generally suffers from inconvenient adjustment. Traditional devices require external tools for tension adjustment, resulting in cumbersome operation and low maintenance efficiency. For example, in daily workshop maintenance scenarios, operators need to frequently use wrenches or special tools to rotate fasteners, which is not only time-consuming and labor-intensive, but may also cause equipment damage due to lost tools or improper operation.

[0015] To address these issues, researchers focused on eliminating reliance on external tools. By analyzing the principles of mechanical transmission, they discovered that a threaded pair structure could achieve tool-free linear adjustment, but the stability of the motion trajectory needed to be addressed. Further consideration was given to using a guiding mechanism to constrain the direction of motion, while simultaneously designing a manually operable rotating component, ultimately resulting in a solution integrating the screw 301's transmission and guiding constraints.

[0016] Therefore, this application proposes a technical solution including a base 1, a groove 2, and a tensioning assembly 3. The tensioning assembly 3 includes a screw 301 that passes through the groove 2, one end of which is connected to a manual turntable 306, and the other end is connected to a threaded sleeve 302. A concave plate 303 with a pulley 304 is fixed to the top of the threaded sleeve 302, and a guide block 305 is provided at the bottom of the concave plate 303 to cooperate with the guide groove 4 of the base 1.

[0017] Among them, screw 301 refers to a rod-shaped component with external threads, specifically a trapezoidal threaded rod, used to convert rotational motion into linear displacement. Turntable 306 refers to a disc-shaped operating component connected to the end of screw 301, specifically fixed by welding or keyway, facilitating manual rotation and force application. Screw sleeve 302 refers to a sleeve with internal threads, specifically made of copper alloy, which achieves axial movement by meshing with screw 301. Guide block 305 refers to a protruding structure fixed to the bottom of concave plate 303, specifically a rectangular steel block, used to restrict the movement direction of concave plate 303. Guide groove 4 refers to a groove formed on the top of base 1, its dimensions specifically fitting with guide block 305 to ensure concave plate 303 slides along a predetermined trajectory.

[0018] Specifically, the rotating turntable 306 drives the screw 301 to rotate, and the threaded sleeve 302 moves axially along the screw 301 under the action of the thread, causing the concave plate 303 and the pulley 304 to move synchronously. The guide block 305 is embedded in the guide groove 4, so that the concave plate 303 can only move in a straight line, avoiding skew and jamming. When the pulley 304 moves to the target position, the rotation of the turntable 306 is stopped to complete the tension adjustment. The entire process does not require disassembly of parts or use of external tools; precise control can be achieved simply by manual rotation.

[0019] Compared to existing technologies, traditional devices rely on tools to tighten bolts to adjust the position of pulley 304, resulting in limited operating space and a tendency to slip. This solution integrates the screw 301 transmission and guiding mechanism, concentrating the rotational operation on the turntable 306, making the adjustment action more ergonomic. The cooperative design of the guide block 305 and guide groove 4 eliminates the gap error of traditional slide rail structures, improving displacement accuracy.

[0020] Through the above technical solution, this application achieves the core effect of quickly adjusting the tension of pulley 304 by hand. Operators can directly rotate the turntable 306 to complete the adjustment while the equipment is running, significantly shortening maintenance time. The synergistic effect of the guide mechanism and the threaded drive ensures a smooth and reliable adjustment process, avoiding belt wear caused by skewed movement. This design also simplifies the equipment structure and reduces the risk of malfunctions caused by improper tool operation.

[0021] This application further proposes that a positioning component 6 is provided on the left side of the front of the base 1. The positioning component 6 includes a movable box 601, which is located on the front of the base 1. A locking rod 602 is movably fitted inside the cavity of the movable box 601. A push plate 606 is fixedly fitted on the surface of the locking rod 602. The push plate 606 is located inside the cavity of the movable box 601. A spring 605 is provided at the connection between the left side of the push plate 606 and the movable box 601. The spring 605 is fitted on the surface of the locking rod 602. A pull plate 604 is provided at one end of the locking rod 602. A locking hole 307 that matches the other end of the locking rod 602 is opened on the surface of the turntable 306.

[0022] Among them, the movable box 601 refers to the box structure fixed on the front of the base 1. It can be implemented by welding or bolt connection. It is used to accommodate the lever 602 and the spring 605 and limit their range of motion to ensure the stability of the positioning component 6.

[0023] The lever 602 refers to the rod-shaped component that passes through the movable box 601. It can be made of metal rod and can engage or disengage with the turntable 306 through axial movement, thereby restricting the rotation of the turntable 306.

[0024] The push plate 606 refers to the plate-shaped structure sleeved on the surface of the clamp rod 602. Specifically, it can be a ring-shaped metal plate welded and fixed to the clamp rod 602. It is used to transmit the elastic force of the spring 605 and push the clamp rod 602 to move towards the clamp hole 307.

[0025] Spring 605 refers to the elastic element sleeved on the surface of the locking rod 602. Specifically, a helical spring 605 can be used to push the push plate 606 and the locking rod 602 through compression, so that the locking rod 602 is kept in the locking state with the locking hole 307.

[0026] Pull plate 604 refers to the operating component fixed to the end of the lever 602. Specifically, it can be implemented by a metal plate with a gripping groove 2, which makes it easy to manually pull the lever 602 out of the locking hole 307.

[0027] The locating hole 307 refers to the hole-like structure opened on the surface of the turntable 306. Specifically, it can be implemented by equidistantly distributed circular through holes, which restrict the rotation angle of the turntable 306 through cooperation with the locating rod 602.

[0028] Specifically, when the position of the turntable 306 needs to be fixed, the spring 605 pushes the push plate 606 to insert the locking rod 602 into the locking hole 307 of the turntable 306. At this time, the turntable 306 cannot rotate, thus maintaining the axial position of the screw 301. When the screw 301 needs to be adjusted, the locking rod 602 is disengaged from the locking hole 307 by pulling the pull plate 604 outward. At this time, the turntable 306 can rotate freely to realize the movement of the screw 301. After the adjustment is completed, the pull plate 604 is released, and the spring 605 pushes the locking rod 602 to re-insert into the corresponding locking hole 307 to complete the positioning.

[0029] Compared with existing technologies, traditional tensioning devices require external tools to fix the turntable 306, while this solution achieves quick locking and unlocking of the turntable 306 through the cooperation of spring 605 and lever 602, and the adjustment operation can be completed without additional tools, which significantly improves the convenience of operation.

[0030] Through the above technical solution, this application realizes tool-free adjustment of the position of turntable 306. The operator only needs to manually pull the pull plate 604 to release the locked state of turntable 306. After the adjustment is completed, it will automatically reset, which effectively solves the problem of low adjustment efficiency caused by the reliance on tools in traditional devices. At the same time, the elasticity design of spring 605 ensures the reliability of the engagement between the locking rod 602 and the locking hole 307.

[0031] This application further proposes that the number of card holes 307 is not less than eight, and that the eight card holes 307 are equally spaced on the surface of the turntable 306.

[0032] Among them, the card hole 307 refers to the hole structure set on the surface of the turntable 306 for positioning in conjunction with the card rod 602. Specifically, it can be implemented by circular or square through holes, and the number of holes directly affects the precision of the adjustment gear.

[0033] Among them, the equidistant opening means that multiple card holes 307 are evenly distributed around the circumference of the turntable 306. Specifically, it can be achieved by calculating the central angle and using CNC machining equipment. This distribution method can ensure that the turntable 306 is subjected to uniform force after each adjustment.

[0034] Specifically, when the turntable 306 rotates, the locking lever 602 can sequentially engage with different locking holes 307 to achieve positioning and locking. The design of having at least eight locking holes 307 ensures that each 45-degree rotation of the turntable 306 creates a positioning position, significantly increasing adjustment precision compared to traditional devices. The equidistantly distributed locking holes 307 ensure that the turntable 306 remains balanced in any locked position, preventing structural deformation due to eccentric forces.

[0035] Compared to existing technologies, traditional tensioning devices typically only have four or six locking holes 307, resulting in fewer adjustment levels and excessively large intervals. This solution increases the density of the locking holes 307 and optimizes their distribution, providing more selectable positioning points within the same rotational stroke, thus enabling more precise tension adjustment.

[0036] Through the above technical solution, this application enables tool-free rapid adjustment. During operation, simply pulling the lever 602 is sufficient to switch gears, eliminating the need for auxiliary tools such as wrenches. The equidistantly distributed locking holes 307 effectively prevent uneven wear of the turntable 306 due to uneven force during long-term use, thus extending the service life of the device.

[0037] This application further proposes that both sides of the surface of the active box 601 are fixedly fitted with limiting plates 603, and one end of the limiting plate 603 is fixedly connected to the base 1.

[0038] The limiting plate 603 refers to a plate-like structure fixed to both sides of the movable box 601 and connected to the base 1. It can be made of metal sheet and connected by welding or bolts, and is used to limit the lateral displacement of the movable box 601 during operation. The limiting plate 603 is fixedly connected to the base 1 by welding or bolting, ensuring that the movable box 601 maintains a stable position under the rebound of the spring 605 or the action of external force.

[0039] Specifically, the limiting plate 603 forms a rigid constraint with the base 1 through a fixed connection. When the locking rod 602 in the positioning assembly 6 is pushed by the force of the spring 605, the limiting plate 603 can counteract the lateral displacement tendency of the movable box 601 caused by the force. During the rotation adjustment of the turntable 306, the limiting plate 603 and the guide block 305 in the guide groove 4 work together to make the movable box 601 move only in the preset direction, avoiding the misalignment problem between the locking rod 602 and the locking hole 307 caused by structural displacement.

[0040] Compared with existing technologies, the movable box 601 in traditional tensioning devices lacks a lateral limiting structure, which can easily cause displacement due to vibration or force during repeated adjustments, leading to the failure of the positioning component 6. This solution, through the rigid connection between the limiting plate 603 and the base 1, effectively suppresses the offset of the movable box 601 without the need for additional fixing components, thus improving the working reliability of the positioning component 6.

[0041] Through the above technical solution, this application solves the problem of misalignment between the locking rod 602 and the locking hole 307 caused by force offset of the movable box 601, so that the positioning component 6 remains stable during long-term use, reduces the risk of adjustment failure caused by structural misalignment, and thus improves the operating efficiency of the tensioning device.

[0042] This application further proposes that one end of the screw 301 is movably fitted with a movable shaft 308, and one end of the movable shaft 308 is disposed on the inner wall of the groove 2.

[0043] Among them, the movable shaft 308 refers to the axial bearing component used to support the rotation of the screw 301. Specifically, it can be implemented with a structure with rolling bearings or sliding bushings. Its function is to provide stable rotational support for the screw 301 and reduce frictional resistance.

[0044] The inner wall of the groove 2 refers to the lateral structural surface of the groove 2 at the top of the base 1. Specifically, it can be formed into a plane or a curved surface through machining. Its function is to provide a fixed mounting position for the movable shaft 308 and ensure the axial positioning accuracy of the screw 301 when it rotates.

[0045] Specifically, the screw 301 is rotatably connected to the inner wall of the groove 2 via the movable shaft 308. When the turntable 306 drives the screw 301 to rotate, the movable shaft 308 restricts the rotational movement of the screw 301 within its axial degree of freedom, preventing frictional loss caused by lateral displacement. One end of the movable shaft 308 is embedded in a preset position within the inner wall of the groove 2, ensuring that the screw 301 maintains a coaxial relationship with the base 1 during adjustment, thereby ensuring that the screw sleeve 302 drives the concave plate 303 to move smoothly along the guide groove 4.

[0046] Compared with the prior art, in the prior art, the screw 301 directly contacts the inner wall of the groove 2, which easily generates sliding friction during rotation, resulting in increased adjustment resistance and requiring the assistance of tools. This application converts sliding friction into rolling friction or low-resistance sliding through the movable shaft 308, significantly reducing the torque required for manual adjustment. At the same time, the axial limiting function of the movable shaft 308 avoids the problem of screw 301 deflection caused by uneven force.

[0047] Through the above technical solution, this application achieves low resistance and high stability during the rotation adjustment process of screw 301, enabling operators to quickly and accurately adjust the tension of pulley 304 without the need for external tools. At the same time, the mating structure between the movable shaft 308 and the inner wall of the groove 2 effectively extends the service life of the device.

[0048] This application further proposes that mounting plates 5 are fixedly connected to both ends of both sides of the base 1, and mounting holes are opened in the inner cavity of the mounting plates 5.

[0049] Among them, the mounting plate 5 refers to the plate-shaped structure fixed at both ends of the base 1. Specifically, it can be fixed to the base 1 by welding metal plates or bolting, and is used to provide a mounting support surface.

[0050] The mounting hole refers to the through hole structure opened inside the mounting plate 5. It can be formed by drilling or stamping processes and is used to insert bolts or screws to fix the base 1 to the embroidery machine frame.

[0051] Specifically, mounting plates 5 are symmetrically distributed at both ends of the base 1, forming four fixed support points. Fasteners inserted through the mounting holes can stably fix the base 1 to the preset position on the embroidery machine frame. This symmetrical mounting structure balances the force on the base 1, preventing it from shifting due to the tensioning operation of the pulley 304. The size of the mounting holes can be selected according to actual needs, such as accommodating M8 or M10 standard bolts, ensuring that no additional machining of matching holes is required during installation.

[0052] Compared with existing technologies, traditional embroidery frame pulley tensioning devices are usually directly welded or fixed through a single mounting point, which can easily cause the base 1 to loosen or shift when the tension is frequently adjusted. In contrast, this solution achieves multi-point rigid fixation through the design of symmetrical mounting plates 5 on both sides and mounting holes, which significantly improves the stability of the base 1 during tensioning operations.

[0053] Through the above technical solution, this application solves the problem of low adjustment efficiency caused by unstable installation of tensioning device in the prior art. The standardized installation hole design simplifies the assembly process of base 1, enabling workers to quickly fix the device and maintain the structural reliability during long-term use.

[0054] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A belt pulley (304) tensioning device for an embroidery machine frame, comprising a base (1), characterized in that: The base (1) has a groove (2) on its top. A tensioning assembly (3) is provided on the base (1). The tensioning assembly (3) includes a screw (301) and the screw (301) is sleeved in the inner cavity of the groove (2). A turntable (306) is provided at one end of the screw (301). A threaded sleeve (302) is threaded on the surface of the screw (301). A threaded sleeve (302) is threaded on the surface of the threaded sleeve (302). A concave plate (303) is fixedly connected to the top of the threaded sleeve (302). A pulley (304) is rotatably connected to the inner cavity of the concave plate (303). Guide blocks (305) are provided at both ends of the bottom of the concave plate (303). Guide grooves (4) that are adapted to the guide blocks (305) are provided on both sides of the top of the base (1).

2. The belt pulley (304) tensioning device for an embroidery frame of an embroidery machine according to claim 1, characterized in that: A positioning component (6) is provided on the left side of the front of the base (1). The positioning component (6) includes a movable box (601) and the movable box (601) is located on the front of the base (1). A locking rod (602) is movably sleeved in the inner cavity of the movable box (601). A push plate (606) is fixedly sleeved on the surface of the locking rod (602) and the push plate (606) is located in the inner cavity of the movable box (601). A spring (605) is provided at the connection between the left side of the push plate (606) and the movable box (601), and the spring (605) is sleeved on the surface of the locking rod (602). A pull plate (604) is provided at one end of the locking rod (602). A locking hole (307) that matches the other end of the locking rod (602) is opened on the surface of the turntable (306).

3. The belt pulley (304) tensioning device for an embroidery frame of an embroidery machine according to claim 2, characterized in that: The number of the card holes (307) is not less than eight, and the eight card holes (307) are equally spaced on the surface of the turntable (306).

4. The belt pulley (304) tensioning device for an embroidery frame of an embroidery machine according to claim 2, characterized in that: Both sides of the surface of the movable box (601) are fixedly fitted with limiting plates (603), and one end of the limiting plate (603) is fixedly connected to the base (1).

5. The belt pulley (304) tensioning device for an embroidery frame of an embroidery machine according to claim 1, characterized in that: One end of the screw (301) is movably fitted with a movable shaft (308), and one end of the movable shaft (308) is set on the inner wall of the groove (2).

6. The belt pulley (304) tensioning device for an embroidery frame of an embroidery machine according to claim 1, characterized in that: The base (1) has mounting plates (5) fixedly connected to both ends on both sides, and the mounting plates (5) have mounting holes in their inner cavities.

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