Portable Band Saw Tension Mechanism With Intermediate Support
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Solution Overview
Problem
The existing tension adjustment mechanisms in portable band saws are prone to deformation and operational failure due to misalignment of forces, leading to complex bending issues in the slide plate, which can cause the mechanism to fail.
Innovation Solution
A tension adjustment mechanism with first and second wheel support shafts arranged in a parallel configuration, where the first wheel support portion is movable perpendicular to both shafts, and an intermediate support is positioned between the first and second supports to balance loads and reduce bending forces, minimizing deformation and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the slide plate is designed with long holes at four corners to allow tension adjustment, then the tension adjustment function is achieved, but the slide plate becomes prone to complex bending forces and deformation
Solution Approach 1:
The patent introduces an intermediate support as a mediator between the first and second supports. This intermediate support carries part of the load, reducing the bending moment and complex stresses on the slide plate. The intermediate support acts as a structural mediator that distributes forces more favorably, preventing deformation while maintaining the tension adjustment function through the long holes configuration.
2Device complexity
If the compression spring and band saw blade forces are misaligned in the up-to-down direction, then the tension adjustment mechanism can be compact, but a rotational force is generated causing complex bending in the slide plate
Solution Approach 1:
The intermediate support serves as a mediator that balances the rotational force generated by misaligned forces. By positioning the intermediate support appropriately, it creates a counterbalancing moment that offsets the harmful rotational force, allowing the mechanism to remain compact while preventing complex bending in the slide plate.
Solution Approach 2:
The intermediate support provides a counterbalancing effect against the rotational force generated by the misaligned compression spring and band saw blade forces. It creates an opposing moment that neutralizes the harmful rotational effect, preventing complex bending while maintaining mechanism compactness.
3Device complexity
If the slide plate is subjected to rotational force from misaligned tension forces, then the mechanism can function with minimal components, but deformation occurs leading to operational failure
Solution Approach 1:
The intermediate support is introduced as a minimal additional component that acts as a mediator to prevent deformation. It distributes the rotational force and reduces the bending moment on the slide plate, thereby preventing operational failure while maintaining the overall simplicity of the mechanism.
Data Source
AI summary
In a band saw that is provided with a tension adjustment mechanism in which tension for an band saw blade can be adjusted, first and second wheel support shafts are provided in paired first and second wheel support portions, respectively, such that the first support shaft is parallel to the second support shaft. The first wheel support portion is configured to be movable in a direction in which a straight line extends, the straight line being perpendicular to both the first and second wheel support shafts. A first support is provided at a first end of the first wheel support portion, and a second support is provided at a second end of the first wheel support portion. Furthermore, an intermediate support is provided between the first support and the second support. A first load and a second load are configured to be applied to the second support and the intermediate support, respectively, such that the first load and the second load are parallel to the wheel support shaft and the direction of the first load is opposite to that of the second load.