Fiber Cutting Force Measurement Using Sensor-Mounted Blade
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Solution Overview
Problem
Existing methods for measuring cutting forces, such as the wool felt cutter test, are limited in differentiating between blades with small force differences, do not account for the number of fibers cut or their length, and cannot assess dynamic cutting actions like sawing motions or variations in fiber physiology and treatment.
Innovation Solution
A method involving a blade and fiber mount system with sensors to measure cutting forces on fibers as the blade cuts, allowing for adjustable blade angles, fluid modification of fibers, and simulation of dynamic cutting actions, with multiple sensors for precise force measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wool felt cutter test is used to measure cutting force, then the force on the blade can be measured, but the measurement sensitivity is insufficient to differentiate blades with small force differences
Solution Approach 1:
The invention extracts the fiber cutting measurement from the bulk wool felt test. By isolating individual fibers and mounting them on a fixture, the measurement focuses specifically on fiber cutting force rather than the complex interaction of multiple fibers in felt, thereby improving measurement sensitivity without requiring overly complex equipment
Solution Approach 2:
The invention creates a simplified copy of the actual shaving condition by using individual hair fibers mounted on a fixture that simulates the skin surface. This allows accurate measurement of cutting force on fibers while avoiding the complexity of measuring force on actual skin during shaving
2Loss of information
If the wool felt cutter test is used, then blade cutting force can be measured, but information about the number of fibers cut and cut location is lost
Solution Approach 1:
The invention implements feedback by using a sensor connected to the fiber mount that directly measures and records the cutting force on individual fibers. This provides immediate quantitative data about the number of fibers cut and the force required, retaining critical information that would otherwise be lost in the wool felt test
Solution Approach 2:
The invention segments the measurement process by testing individual fibers separately rather than measuring the aggregate force on a bulk felt sample. This segmentation allows for counting the number of fibers cut and measuring force for each fiber, providing detailed information while maintaining a relatively simple test procedure
3Adaptability or versatility
If the blade is held stationary in the wool felt cutter test, then force measurement is simple, but dynamic cutting actions like sawing motion cannot be studied
Solution Approach 1:
The invention applies dynamics by allowing the blade to move relative to the fiber mount during cutting. The blade can be moved manually or mechanically to simulate various cutting motions including sawing, chopping, and scraping movements, enabling the study of dynamic cutting actions while maintaining a relatively simple mounting system
Solution Approach 2:
The blade mount in the invention is designed with multi-functionality, allowing it to hold the blade at different angles and permit various types of motion (manual or mechanical). This universal design enables the same apparatus to study different cutting motions and blade orientations without requiring separate specialized equipment for each condition
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
Enables accurate, sensitive measurement of cutting forces on various fibers and hairs, including those with different treatments and during dynamic blade movements, providing a more comprehensive understanding of cutting forces.
Implementation Method 1
At least one sensor connected to the fiber mount is provided. The cutting force on the fiber is measured with the sensor
Data Source
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Figure 3~4
AI summary
A method for measuring the cutting force on a fiber. The method includes the steps of: providing a blade having an edge; providing a fiber mount for holding the fiber; providing at least one sensor connected to the fiber mount; moving the blade toward the fiber and cutting the fiber; and measuring the cutting force on the fiber with the at least one sensor.