Electric Cutting Blade Position Control via Restriction Contact Detection
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Solution Overview
Problem
In electric cutting devices, accurately determining the current position of cutting blades is challenging due to the risk of foreign objects adhering to proximity sensors, such as Hall sensors, which can prevent precise control of the cutting operation.
Innovation Solution
The implementation of a cutting device with a pair of cutting blades, an electric motor, a controller, and a contact detector that restricts the movement of the cutting blades and detects contact with a restriction portion, allowing for accurate positioning and control by calculating the operation amount of the motor based on detected contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a proximity sensor such as a Hall sensor is provided in an internal drive mechanism to detect the current position of the cutting blade, then the position detection capability is improved, but the reliability deteriorates because foreign objects may adhere to the sensor and cause inaccurate detection
Solution Approach 1:
The invention extracts the detection function from the internal drive mechanism and relocates it to an external position. The detection portion is provided outside the housing at a position that does not interfere with the cutting operation, thereby eliminating the problem of foreign objects adhering to the sensor while maintaining position detection capability.
Solution Approach 2:
The invention introduces a detection portion that acts as an intermediary between the cutting blade and the control system. This detection portion detects the position of the cutting blade through magnetic field changes or other non-contact methods, allowing accurate position detection without physical contact that could lead to foreign object adhesion.
2Measurement precision
If a magnet is provided to a nut of a ball screw and a Hall sensor is provided at a specific location within a movement range of the nut, then the position detection capability is improved, but the device complexity increases due to the additional components and installation requirements
Solution Approach 1:
The invention extracts the magnet from the internal ball screw mechanism and relocates it to the cutting blade itself. The detection portion is positioned outside the housing, simplifying the internal drive mechanism while maintaining the ability to detect blade position through magnetic field changes.
Solution Approach 2:
The cutting blade is given a dual function: it performs the cutting operation and also carries the magnet for position detection. This eliminates the need for separate detection components within the drive mechanism, reducing overall device 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 solution enables precise control of the cutting blades, ensuring they can be stopped at predetermined target positions without the need for proximity sensors, thus avoiding issues caused by foreign objects and improving operational accuracy.
Implementation Method 1
a contact detector configured to detect that at least one of the first member and the second member comes into contact with the restriction portion
Data Source
AI summary
An electric cutting device includes: a pair of cutting blades having a first blade and a second blade, the pair of cutting blades being 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; a first member provided with the first cutting blades; a second member provided with the second cutting blade; a restriction portion configured to come into contact with at least one of the first member and the second member to restrict an operable range of the pair of cutting blades; and a contact detector configured to detect that at least one of the first member and the second member comes into contact with the restriction portion.