Bench Circular Saw Automatic Torque Adjusting Mechanism
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Solution Overview
Problem
Conventional bench circular saws face issues with insufficient torque during cutting large-sized workpieces and vibration due to uneven pressure, which affects the quality of the cut surface and user experience.
Innovation Solution
An automatic torque adjusting mechanism is implemented, allowing stepless torque adjustment through a system of pulleys and belts between the motor and the cutting blade, ensuring optimal torque matching the load and preventing belt slippage and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gear ratio with a large speed reduction ratio is adopted to increase torque, then torque is improved, but rotational speed becomes insufficient and cutting cannot be performed well at the beginning of cutting
Solution Approach 1:
The patent employs a variable speed reduction mechanism where the speed reduction ratio changes dynamically during operation. Initially, a smaller speed reduction ratio provides high rotational speed for starting cutting, while later a larger ratio provides high torque for completing the cut. This is achieved through a mechanism that allows the belt to shift between different pulley diameters, changing the transmission characteristics in real-time based on operational needs.
2Stability of the object's composition
If motor control means and brake means are provided to control rotational speed and torque, then vibration is reduced, but the problem of insufficient torque in cutting large-sized workpiece cannot be addressed
Solution Approach 1:
The patent replaces static motor control with a dynamic mechanical transmission system. The variable speed reduction mechanism automatically adjusts the torque and speed characteristics based on the cutting stage, providing high torque for large workpieces without relying on motor control means. The system adapts mechanically to the load conditions, eliminating the need for complex electronic control while maintaining stability.
3Force
If the body is lowered resisting energization during cutting, then cutting force is improved, but the saw blade vibrates when pressing condition is uneven, deteriorating cut surface quality
Solution Approach 1:
The patent uses a dynamic torque adjustment mechanism that automatically adapts to varying cutting conditions. When pressing force is uneven or load changes during cutting, the variable speed reduction mechanism adjusts the torque transmission accordingly, maintaining stable blade rotation and preventing vibration. This mechanical adaptation occurs automatically without requiring active control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mechanism provides consistent and appropriate torque for various cutting situations, enhancing the durability of the cutting blade, maintaining an excellent cut surface, and preventing interference with the guide fence, while allowing for a compact design.
Implementation Method 1
an automatic torque adjusting mechanism 20 which adjusts torque automatically according to load in rotation of the cutting blade 10, is arranged between the output shaft 9 and the rotary shaft 13; the automatic torque adjusting mechanism 20 includes a driving pulley 21 arranged in the output shaft 9, a driven pulley 22 arranged in the rotary shaft 13, and an endless belt 23 stretched between both pulleys 21, 22
Data Source
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AI summary
[Object] To improve durability and to maintain excellent cut surface and feeling of usage with a simpler constitution. [Means for solution] In a bench circular saw (1), a body provided with a saw blade (10) rotating by a motor (8) is arranged so as to move vertically on a base (2) on which a workpiece is placed, an output shaft (9) of the motor 8 is arranged in parallel with a spindle (13) of the saw blade (10), and an automatic torque adjusting mechanism 20 provided with a driving pulley (21), a driven pulley (22) and a belt (23) and automatically adjusting torque transmitted from the output shaft (9) to the spindle (13) according to the load in rotating of the saw blade (10) is arranged between the output shaft (9) and the spindle (13).