Band saw blade track adjusting structure and band saw

Abstract

The utility model relates to a band saw blade track adjusting structure and band saw, it includes frame, driving wheel, from driving wheel and saw blade, the upside of frame is equipped with cutting area, each is equipped with a bearing seat on the frame of cutting area both sides, first guide bearing, second guide bearing and limit bearing are rotatably equipped on the bearing seat, the saw blade passes through the clearance between two guide bearings, the outer wall of limit bearing and the back of saw blade rolling contact, the bearing seat and the frame form the guide structure of the bearing seat along the constraint of up and down translation between, still be equipped with the fastener of the bearing seat and the frame complete fixation, the utility model can be relatively quick and efficient adjustment saw blade's tension, and still have good saw blade positioning guide effect, avoid saw blade in the operation and produce obvious shaking.

Description

Technical Field

[0001] This utility model relates to a tension adjustment device for a band saw blade, and more particularly to a band saw blade track adjustment structure and a band saw. Background Technology

[0002] In modern manual wood and metal processing, 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, hence the widespread use of electric band saws. The circular saw blade on an electric band saw is fitted onto a drive wheel and a driven wheel. To prevent slippage between the saw blade and the drive wheel, the saw blade needs to be tensioned. However, saw blades produced by different manufacturers vary in length, so ensuring proper blade tension is a problem that needs to be solved. To address this issue, current technology uses only one adjustment mechanism to regulate the tension and relaxation of the saw blade. When installing the saw blade, rotating the adjustment mechanism relaxes the driven wheel; after installing the saw blade, rotating the adjustment mechanism tensions the driven wheel. This method allows for approximate adjustment of the saw blade tension, but the adjustment precision is poor, and during operation, the saw blade tends to wobble left and right and back and forth, leading to errors during cutting.

[0003] To address these issues, a patent (patent number: 201520142618.1) entitled "An Adjustment Structure for a Band Saw Blade on a Band Saw Machine Table" describes a band saw blade that extends downwards from the housing and into the table surface. The adjustment structure is located on the back of the band saw blade and is suspended from the housing by a vertical rod. The adjustment structure is a vertically placed flat plate, perpendicular to the band saw blade and positioned on the back of the blade close to it. The vertical rod is fixed to the surface of the flat plate facing away from the band saw blade. The flat plate has an upper through hole and a lower through hole. Two lower bearings are located on the lower through hole, positioned on either side of the band saw blade and close to it, limiting the left-right swaying of the band saw blade. An upper bearing is located on the upper through hole, positioned behind the band saw blade, with the top surface of the rotatable outer ring of the upper bearing close to the back of the band saw blade, limiting the backward movement of the band saw blade. This patent provides tension adjustment for the saw blade and solves the problem of the band saw blade swaying left-right and back-and-forth during operation. However, when it comes to tension adjustment, the positions of the two lower bearings and the upper bearing on the plate need to be fine-tuned, making the entire tension adjustment process inconvenient and inefficient. Summary of the Invention

[0004] This utility model provides a band saw blade track adjustment structure and a band saw; it solves the problem that the adjustment structure used to adjust the tension of the band saw blade in the prior art is too complicated in actual adjustment.

[0005] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a band saw blade track adjustment structure, including a base, a drive wheel, a driven wheel and a saw blade. The upper side of the base is provided with a cutting zone that runs through the front and back. The saw blade runs horizontally through the cutting zone. A bearing seat is provided on each side of the base. A first guide bearing, a second guide bearing and a limiting bearing are rotatably provided on the bearing seat. The first guide bearing and the second guide bearing are parallel in axis. The saw blade passes through the gap between the two guide bearings. The axis of the limiting bearing is perpendicular to any one of the guide bearings. The outer wall of the limiting bearing makes rolling contact with the back of the saw blade. A guide structure is formed between the bearing seat and the base to constrain the bearing seat to move vertically. Fasteners are also provided to completely fix the bearing seat to the base.

[0006] The first and second guide bearings on the bearing housing are located on the upper and lower sides of the saw blade to limit the vibration of the saw blade on the upper and lower sides. The limiting bearing is located on the back side of the saw blade to limit the vibration of the saw blade in the back side direction. At the same time, the positions of the two bearing housings are adjustable. By releasing the locking effect of the fasteners, the positions of the two bearing housings can be manually adjusted up and down under the constraint of the guide structure. This allows for adjustment of the tension of the saw blade. After adjustment, the fasteners are tightened again to completely fix the bearing housings.

[0007] Furthermore, the bearing housing is provided with two oblong holes distributed along the vertical direction, and the corresponding part of the machine base is provided with two screw holes. Bolts / screws that are screwed into the two oblong holes are inserted into the screw holes; the two bolts / screws and the two oblong holes constitute the guide structure, and the bolts / screws are the fasteners. Through the above technical solution, the locking state of the bearing housing can be adjusted by rotating the bolts / screws. The overall structure is simple and the operation is convenient.

[0008] This utility model also provides a band saw, including a band saw body and a saw blade tension adjustment structure thereon, characterized in that: the saw blade tension adjustment structure is the above-mentioned band saw blade track adjustment structure.

[0009] Therefore, this utility model has the following characteristics compared with the prior art: 1. By setting a guide structure between the bearing seat and the machine base to constrain the bearing seat to move vertically, and setting fasteners to adjust the fixed state of the bearing seat and the machine base, this utility model can achieve the effect of efficiently adjusting the position of the bearing seat. The bearing seat is provided with guide bearings and limit bearings for guiding and limiting the saw blade, which makes this utility model able to adjust the tension of the saw blade relatively quickly and efficiently, and also has a good saw blade positioning and guiding effect, avoiding obvious vibration of the saw blade during operation. Attached Figure Description

[0010] AppendixFigure 1 This is a schematic diagram of the structure of this utility model;

[0011] Appendix Figure 2 This is a structural schematic diagram of the bearing housing and its auxiliary components.

[0012] In the diagram: 10, base; 11, screw hole; 20, drive wheel; 30, driven wheel; 40, saw blade; 50, cutting area; 60, bearing seat; 61, first rotating shaft; 62, second rotating shaft; 63, first guide bearing; 64, second guide bearing; 65, limit bearing; 66, oval hole; 67, bolt. Detailed Implementation

[0013] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0014] 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.

[0015] Example 1: A band saw blade track adjustment structure includes a base 10, a drive wheel 20, a driven wheel 30, and a saw blade 40. The upper side of the base 10 is provided with a cutting zone 50 that runs through the front and back. The saw blade 40 runs horizontally through the cutting zone 50. A bearing seat 60 is provided on each side of the base 10 on the cutting zone 50. The bearing seat 60 is provided with two horizontally parallel first rotating shafts 61 and a vertical second rotating shaft 62. A first guide bearing 63 and a second guide bearing 64 are rotatably mounted on the two first rotating shafts 61, and a limit bearing 65 is rotatably mounted on the second rotating shaft 62. The saw blade 40 passes through the gap between the two guide bearings. The axial direction of the limit bearing 65 is perpendicular to either guide bearing. The outer wall of the limit bearing 65 makes rolling contact with the back of the saw blade 40. A guide structure is formed between the bearing seat 60 and the base 10 to constrain the bearing seat 60 to move vertically. Fasteners are also provided to completely fix the bearing seat 60 to the base 10.

[0016] The first guide bearing 63 and the second guide bearing 64 on the bearing housing 60 are located on the upper and lower sides of the saw blade 40 to limit the vibration of the saw blade 40 on the upper and lower sides. The limiting bearing 65 is located on the back side of the saw blade 40 to limit the vibration of the saw blade 40 in the back side direction. At the same time, the positions of the two bearing housings 60 are adjustable. By releasing the locking effect of the fasteners, the positions of the two bearing housings 60 can be manually adjusted up and down under the constraint of the guide structure. This allows the tension of the saw blade 40 to be adjusted. After adjustment, the fasteners are tightened again, and the bearing housings 60 are completely fixed.

[0017] Specifically, the bearing housing 60 has two oblong holes 66 distributed vertically, and the base 10 has two corresponding screw holes 11. Bolts 67, which are screwed into the screw holes 11, are inserted into the two oblong holes 66. The outer diameter of the shank of the bolt 67 is close to the width of the oblong hole 66. The two bolts 67 and the two oblong holes 66 form a guide structure, and the bolts 67 are fasteners. Through the above technical solution, the locking state of the bearing housing 60 can be adjusted by rotating the bolts 67. The overall structure is simple and the operation is convenient.

[0018] Specifically, the axes of the two guide bearings are distributed at an acute angle relative to the axis of the drive wheel 20 or the driven wheel 30, with an angle of approximately 45°. By deflecting the axes of the two guide bearings to a certain extent, the saw blade 40 can be twisted. Moderate twisting can balance the force on both sides of the saw blade 40 and prevent excessive wear on one side.

[0019] Specifically, the gap between the first guide bearing 63 and the second guide bearing 64 on the same side is greater than the thickness of the saw blade 40, which is between 0.5-1mm thick, and the gap width is about 0.2-0.4mm wider than the thickness of the saw blade 40; the center distance of the oblong hole 66 is 2 to 4 cm.

[0020] This embodiment also discloses a band saw, including a band saw body and a saw blade tension adjustment structure thereon, wherein the saw blade tension adjustment structure is the aforementioned band saw blade track adjustment structure. Furthermore, since the specific structure of the band saw body excluding the upper saw blade tension adjustment structure is all prior art, it will not be described in detail here.

[0021] 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 blade track adjustment structure, comprising a base (10), a drive wheel (20), a driven wheel (30), and a saw blade (40), wherein the upper side of the base (10) is provided with a cutting zone (50) extending from front to back, and the saw blade (40) extends laterally through the cutting zone (50), characterized in that: A bearing seat (60) is provided on each of the machine bases (10) on both sides of the cutting area (50). A first guide bearing (63), a second guide bearing (64), and a limiting bearing (65) are rotatably provided on the bearing seat (60). The first guide bearing (63) and the second guide bearing (64) are parallel in axis. The saw blade (40) passes through the gap between the two guide bearings. The axis of the limiting bearing (65) is perpendicular to any one of the guide bearings. The outer wall of the limiting bearing (65) makes rolling contact with the back of the saw blade (40). A guide structure is formed between the bearing seat (60) and the machine base (10) to constrain the bearing seat (60) to move up and down. Fasteners are also provided to completely fix the bearing seat (60) and the machine base (10).

2. The band saw blade track adjustment structure according to claim 1, characterized in that: The bearing housing (60) is provided with two oblong holes (66) distributed in the vertical direction. The base (10) is provided with two screw holes (11) at the corresponding positions. Bolts (67) / screws that are screwed into the two oblong holes (66) are inserted into the screw holes (11). The two bolts (67) / screws and the two oblong holes (66) constitute the guide structure. The bolts (67) / screws are the fasteners.

3. The band saw blade track adjustment structure according to claim 1, characterized in that: The axial directions of the two guide bearings are distributed at an acute angle relative to the axial direction of the driving wheel (20) or the driven wheel (30).

4. The band saw blade track adjustment structure according to claim 2, characterized in that: The gap between the first guide bearing (63) and the second guide bearing (64) on the same side is greater than the thickness of the saw blade (40).

5. The band saw blade track adjustment structure according to claim 2, characterized in that: The center distance of the oval hole (66) is 2 to 4 cm.

6. A band saw, comprising a band saw body and a saw blade tension adjustment structure thereon, characterized in that: The saw blade tension adjustment structure is the band saw blade track adjustment structure as described in any one of claims 1 to 5.

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