Toggle-Link Cutting Blades That Avoid Collision After Full Cut
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Solution Overview
Problem
In electric cutting devices, the timing for braking the cutting blades is not always optimal, leading to potential collisions and damage due to varying speeds based on the shape and material of the object being cut, and premature stopping can result in incomplete cutting.
Innovation Solution
A drive mechanism using a toggle link mechanism with a ball screw converts the movement of a movement member into an opening and closing operation of the cutting blades, ensuring they come closest to each other at a predetermined position, regardless of the stopping timing, thereby preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the timing to start braking the cutting blades is delayed, then the cutting blades can complete the cutting of the object, but the cutting blades collide with each other at high relative speed causing deformation or damage
Solution Approach 1:
The braking action is initiated in advance based on the movement amount of the movement member rather than waiting for blade position feedback. The control unit determines to start braking when the movement member has moved by a predetermined amount from the blade contact position, ensuring braking begins at the optimal moment to prevent collision while completing the cut.
Solution Approach 2:
The control unit continuously monitors the movement amount of the movement member and uses this feedback to determine the precise timing for braking. By measuring the displacement of the movement member from the blade contact position, the system dynamically adjusts the braking timing to match the actual cutting progress, preventing both premature stopping and blade collision.
2Reliability
If the cutting blades are stopped with a sufficient timing before collision, then blade damage is prevented, but the cutting of the object may be incomplete
Solution Approach 1:
The braking action is initiated in advance based on the movement amount of the movement member rather than waiting for blade position feedback. The control unit determines to start braking when the movement member has moved by a predetermined amount from the blade contact position, ensuring braking begins at the optimal moment to prevent collision while completing the cut.
3Manufacturing precision
If precise positioning control is implemented to stop the movement member at the exact position where cutting blades come closest, then cutting precision is improved, but device complexity increases
Solution Approach 1:
The system uses the movement member's own displacement as the control parameter for braking timing. Instead of requiring separate positioning sensors and complex control algorithms, the control unit simply monitors how far the movement member has moved from the blade contact position and triggers braking at the predetermined displacement, achieving reliable collision prevention with minimal added complexity.
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
This configuration reliably prevents collisions between cutting blades while ensuring complete cutting of the object, maintaining a consistent positional relationship between the blades, even without precise positioning control.
Implementation Method 1
The drive mechanism includes a nut of a ball screw. The drive mechanism is configured to: in a case where the movement member moves in the predetermined direction, cause the pair of cutting blades to move in a direction closer to each other; and after the pair of cutting blades come closest to each other, in a case where the movement member further moves in the predetermined direction, cause the pair of cutting blades to move in a direction away from each other.
Data Source
AI summary
An electric cutting device includes: a pair of cutting blades for clamping and cutting an object; an electric motor; and a drive mechanism for operating the cutting blades. The drive mechanism includes a movement member movable in a predetermined direction by a driving force of the electric motor and converts movement of the movement member into an opening and closing operation of the cutting blades. The drive mechanism is configured to: when the movement member moves in the predetermined direction, cause the pair of cutting blades to move in a direction closer to each other; and after the pair of cutting blades come closest to each other, when the movement member further moves in the predetermined direction, cause the pair of cutting blades to move in a direction away from each other.