Bandsaw with tensioning aid

Abstract

The utility model relates to a band saw with tensioning auxiliary structure. It includes body, driving wheel, driven wheel, saw blade and motor, the body is equipped with the sliding seat on the sliding, the driven wheel rotates the assembly in the sliding seat, is equipped with the abutment plate on the sliding seat, the body still is equipped with tensioning control disc rotation, the inside eccentricity of tensioning control disc is equipped with eccentric rod, is equipped with elastic piece between eccentric rod with the sliding seat, the body and is located the outside screw rod of the sliding seat is screwed, the inner end of screw rod is equipped with the limit piece. The utility model can adjust the position of limit piece according to the saw blade length to be replaced, thereby making the maximum interval between driving wheel and driven wheel always match the length of saw blade, thereby making different length saw blade also can be normally tensioned, and the adjustment mode of limit piece is simple.

Description

Technical Field

[0001] This utility model relates to a band saw, and more particularly to a band saw with a tensioning auxiliary structure. Background Technology

[0002] In modern manual woodworking and metalworking, materials such as wood, metal pipes, and steel bars need to be cut. Traditional hand saws can no longer meet the efficiency requirements of modern operations; therefore, electric band saws are widely used. The structure of an electric band saw mainly consists of a body, a drive wheel, a driven wheel, a band saw blade, and a motor. The band saw blade connects the drive wheel and the driven wheel. The band saw blade needs a certain tension to maintain rigidity, and also needs tension to prevent the drive wheel from slipping.

[0003] To this end, Japanese Patent Publication No. 2016-147339 discloses a portable band saw as a power tool. This portable band saw has a tension adjustment mechanism with a slide plate for applying tension to the band saw blade. A rotating operating handle moves an eccentric rod, thereby controlling the compression state of a compression spring. When the compression spring is compressed, the slide plate slides outward, thus enabling rapid switching of the band saw blade's tension.

[0004] Because the portable band saw has a limiting wall to restrict the outward sliding of the slide plate, and the movement distance of the eccentric rod driven by the operating handle is fixed, the maximum distance between the driving wheel and the driven wheel is a fixed value. However, due to the certain deviation in the length of band saw blades from different manufacturers, the existing tension adjustment mechanism will fail when the purchased band saw blade deviates significantly from the original size. Summary of the Invention

[0005] This invention provides a band saw with a tensioning auxiliary structure, which solves the problem that the existing tension adjustment mechanism cannot address the dimensional deviation of the band saw blade.

[0006] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: A band saw with a tensioning auxiliary structure includes a machine body, a drive wheel, a driven wheel, a saw blade, and a motor. The saw blade is connected to the drive wheel and the driven wheel. The output shaft of the motor is drivenly connected to the drive wheel. A sliding seat is slidably mounted on the machine body. The driven wheel is rotatably mounted on the sliding seat, so that the driven wheel can slide synchronously relative to the machine body with the sliding seat. An abutment plate is provided on the sliding seat. The two are combined in an inverted "L" shape. A tensioning control disc is also rotatably mounted on the machine body. A lever is integrally connected to the outer side of the tensioning control disc. The tension control disc has a tension control block on its inner side, which is specifically an eccentric rod or a cam. An elastic element is provided between the tension control block and the sliding seat. A screw is screwed onto the machine body and located on the outer side of the sliding seat. The inner end of the screw has a limiting piece that abuts against the abutment plate. The position of the limiting piece can be finely adjusted by rotating the screw. When the tension control disc is rotated so that the tension control block squeezes the elastic element, the sliding seat moves towards the limiting piece under the rebound force of the elastic element until the abutment plate abuts against the limiting piece. At this time, the saw blade is fully tensioned.

[0007] When switching the tension, the operation method of this utility model is the same as that of existing band saws. The tension control disc can be rotated to the locking position and the unlocking position by turning the wrench. When rotated to the locking position, the distance between the tension control block and the limiting plate is the smallest, and the elastic element is in a fully compressed state. The rebound force of the elastic element will push the abutment plate firmly against the limiting plate. At this time, the distance between the driven wheel and the driving wheel increases, and the saw blade is tensioned. Conversely, when rotated to the unlocking position, the distance between the tension control block and the limiting plate is the largest, and the elastic element returns to its original length. At this time, the elastic element cannot provide tension, which facilitates the replacement of the saw blade.

[0008] This invention allows adjustment of the position of the limiting plate according to the length of the saw blade to be replaced. When the saw blade is too long, the limiting plate needs to be moved outward by rotating the screw, increasing the outward offset distance of the sliding seat, thus ensuring the saw blade is properly tensioned. However, because the clamping length of the elastic element is increased compared to the normal level, the actual maximum tension force is somewhat reduced. Conversely, when the saw blade is too short, the limiting plate needs to be moved inward by rotating the screw, decreasing the outward offset distance of the sliding seat, thus ensuring the saw blade is properly tensioned.

[0009] Furthermore, the screw has a marking line / marking groove in its middle section, and the machine body has an observation window for viewing the marking line / marking groove. The observation window area has graduated marking lines, with different marking lines corresponding to different saw blade lengths. Through the above technical solution, this utility model has recorded various commonly used saw blade lengths within the graduated marking lines. This allows for precise adjustment of the screw's feed distance based on the actual length of the saw blade, ensuring that the marking line / marking groove aligns with the corresponding length graduated marking line, thus ensuring the saw blade is within its optimal tension range.

[0010] Therefore, this utility model has the following characteristics compared with the prior art: 1. This utility model can adjust the position of the limiting plate according to the length of the saw blade to be replaced, so that the maximum distance between the driving wheel and the driven wheel always matches the length of the saw blade, so that saw blades of different lengths can be tensioned normally, and the adjustment method of the limiting plate is simple; 2. The marking line / marking groove is moved to the corresponding scale marking line to ensure that the saw blade is within the optimal tension range, and the feed distance of the screw is precisely controlled according to the actual length of the saw blade. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Appendix Figure 2 It is attached Figure 1 Enlarged view of part A;

[0013] Appendix Figure 3 It is attached Figure 1 Enlarged view of part B;

[0014] Appendix Figure 4 It is a partial view of the observation window;

[0015] Appendix Figure 5 This is a partial structural diagram of the present invention for removing the driven wheel;

[0016] Appendix Figure 6 It is a partial sectional view through the axis of the shaft. Detailed Implementation

[0017] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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, and are not intended to 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 of this utility model.

[0019] Example 1: See Figure 1 , Figure 2 and Figure 3 A band saw with a tensioning auxiliary structure includes a body 10, a drive wheel 20, a driven wheel 30, a saw blade, and a motor 50. The saw blade is connected to the drive wheel and the driven wheel. The output shaft of the motor is driven by the drive wheel. A sliding seat 60 is slidably mounted on the body, and a shaft 31 is fixed on the sliding seat 60. The driven wheel is rotatably mounted on the shaft. An abutment plate 61 is provided on the sliding seat. The abutment plate and the sliding seat are integrally formed from sheet metal. A tensioning control disc 70 is also rotatably mounted on the body. An eccentric rod 7 is eccentrically mounted on the inner side of the tensioning control disc. 1. An elastic element 80 is provided between the eccentric rod and the sliding seat. A wrench 72 is fixedly provided on the outside of the tension control disc. A screw 90 is screwed onto the machine body and located on the outside of the sliding seat. The inner end of the screw is provided with a limiting piece 91 that abuts against the abutment plate. A screw cap 92 is fixed on the outer end of the screw. When the tension control disc is rotated so that the eccentric rod deflects to the side close to the limiting piece, the elastic element is in an elastic compression state. The sliding seat moves towards the limiting piece under the action of the elastic element's rebound force until the abutment plate abuts against the limiting piece. At this time, the saw blade is fully tensioned.

[0020] In this embodiment, the operation method for switching tension is the same as that of existing band saws. The position of the eccentric rod on the tension control disc is controlled by manually turning a wrench. When the eccentric rod is biased towards the elastic element, the distance between the eccentric rod and the limiting plate is the smallest, which is less than the original length of the elastic element. Therefore, the elastic element is compressed, and the abutment plate is firmly pressed against the limiting plate. At this time, the distance between the driven wheel and the driving wheel increases, and the saw blade is tensioned. Conversely, when the eccentric rod is away from the elastic element, the distance between the eccentric rod and the limiting plate increases, and the elastic element returns to its original length. At this time, the elastic element completely loses its tensioning effect, which facilitates the replacement of the saw blade.

[0021] In this embodiment, the position of the limiting plate can be adjusted according to the length of the saw blade to be replaced. When the saw blade is too long, the limiting plate needs to be moved outward by rotating the screw, increasing the outward offset distance of the sliding seat, so that the saw blade can be tensioned normally. However, relatively speaking, because the clamping length of the elastic element is increased compared to the normal level, the actual maximum tension force is reduced to a certain extent. Conversely, when the saw blade is too short, the limiting plate needs to be moved inward by rotating the screw, decreasing the outward offset distance of the sliding seat, so that the saw blade can be tensioned normally.

[0022] See Figure 3 and Figure 4 The screw has a marking line 93 in the middle, and the machine body has an observation window 11 for viewing the marking line. The observation window area has scale marking lines, and different scale lines on the scale marking lines correspond to different saw blade lengths. Through the above technical solution, this embodiment has recorded various commonly available saw blade lengths in the scale marking lines. This allows for precise adjustment of the screw's feed distance based on the actual length of the saw blade, ensuring that the marking line aligns with the corresponding length scale marking line, thus ensuring that the saw blade is within the optimal tension range.

[0023] See Figure 5 and Figure 6 The machine body is provided with a mounting base 12, on which two parallel and spaced baffles 13 are formed. A sliding seat is accommodated between the two baffles. The mounting base is also provided with an abutment plate 14 that abuts against the top surface of the sliding seat. A limiting rod 15 that is fixed relative to the sliding seat is slidably abutted against the bottom surface of the sliding seat. The limiting rod presses against the front and rear ends of the sliding seat. In this way, the sliding seat can be well constrained, so that it can only slide back and forth in a fixed direction, and the sliding process remains stable.

[0024] This invention can be modified in many ways, as will be apparent to those skilled in the art, and such modifications are not considered to depart from the scope of this invention. All such modifications that are obvious to those skilled in the art are included within the scope of these claims.

Claims

1. A band saw with a tensioning auxiliary structure, comprising a machine body, a drive wheel, a driven wheel, a saw blade, and a motor, wherein the saw blade is connected to the drive wheel and the driven wheel, and the output shaft of the motor is drively connected to the drive wheel, characterized in that: A sliding seat is slidably mounted on the machine body, and the driven wheel is rotatably mounted on the sliding seat, so that the driven wheel can slide synchronously with the sliding seat relative to the machine body. The sliding seat is provided with an abutment plate, and the two are combined in an inverted "L" shape. A tension control disc is also rotatably mounted on the machine body, and a tension control block is provided on the inner side of the tension control disc. An elastic element is provided between the tension control block and the sliding seat. A screw is screwed onto the machine body and located on the outer side of the sliding seat. The inner end of the screw is provided with a limiting piece that abuts against the abutment plate. The position of the limiting piece can be finely adjusted by rotating the screw. When the tension control disc is rotated so that the tension control block squeezes the elastic element, the sliding seat moves towards the limiting piece under the action of the elastic element until the abutment plate abuts against the limiting piece. At this time, the saw blade is fully tensioned.

2. The band saw with a tensioning auxiliary structure according to claim 1, characterized in that: The screw has a marking line / marking groove in the middle, and the machine body has an observation window that can observe the marking line / marking groove. The observation window area has scale marking lines.

3. The band saw with a tensioning auxiliary structure according to claim 1, characterized in that: A screw cap is fixed to the outer end of the screw.

4. The band saw with a tensioning auxiliary structure according to claim 1, characterized in that: The machine body is provided with a mounting base, on which two parallel baffles are formed, and between the two baffles is the sliding seat. The mounting base is also provided with an abutment plate that abuts against the top surface of the sliding seat, and a limiting rod that is fixed relative to the sliding seat is slidably abutted against the bottom surface of the sliding seat.

5. The band saw with a tensioning auxiliary structure according to claim 1, characterized in that: The tension control block is specifically an eccentric rod or a cam.

6. The band saw with a tensioning auxiliary structure according to claim 5, characterized in that: A wrench is integrally connected to the outside of the tension control panel.

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