Electric Cutting Blade Braking for Precise Stop Position
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Solution Overview
Problem
Existing electric cutting devices face challenges in stopping cutting blades at a predetermined position due to varying operation speeds based on the material and shape of the object being cut, leading to potential blade deformation or damage from collisions.
Innovation Solution
An electric cutting device equipped with a speed detector and controller that adjusts the braking of cutting blades based on detected speed indices, ensuring they stop at the appropriate position by calculating a braking distance index and adjusting the braking start timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting blades operate at high speed to improve productivity, then cutting efficiency is improved, but the cutting blades may collide with each other causing deformation or damage
Solution Approach 1:
The control unit receives feedback from the speed sensor about the actual operating speed of the cutting blades and adjusts the braking force accordingly. The control unit calculates the required braking force based on the detected speed and applies appropriate braking to stop the blades at the predetermined position, preventing collision damage while maintaining high-speed operation capability
Solution Approach 2:
The system performs preliminary detection of the operating speed before braking is applied. The control unit calculates the appropriate braking force in advance based on the detected speed and prepares the braking mechanism to stop the blades at the correct position, ensuring high-speed operation can be maintained up to the point of braking
2Reliability
If the cutting blades are operated at low speed to prevent collision, then blade safety is improved, but the cutting operation takes too much time reducing productivity
Solution Approach 1:
The system operates the cutting blades at high speed during the cutting stroke, then applies periodic braking action to stop the blades at the predetermined position before the return stroke. This periodic high-speed operation with controlled stopping allows maintaining productivity while preventing collision damage through proper timing of braking intervention
3Manufacturing precision
If the braking force is increased to stop the cutting blades at the target position, then stopping precision is improved, but excessive braking force may cause heat generation or damage to the braking mechanism
Solution Approach 1:
The braking force is dynamically adjusted based on the detected operating speed of the cutting blades. The control unit calculates the appropriate braking force as a function of the detected speed, applying stronger braking when speed is high and weaker braking when speed is already low. This dynamic adjustment achieves precise stopping at the target position while minimizing unnecessary braking force that would generate excessive heat
Data Source
AI summary
An electric cutting device includes a pair of cutting blades configured to clamp and cut an object, an electric motor configured to generate a driving force necessary for operating the cutting blades, a controller configured to control an operation of the electric motor, and a speed detector configured to detect a speed index, the speed index indicating an operation speed of the cutting blades. The controller is configured to brake the cutting blades based on the speed index.