Arch-Shaped Open Cutter for Foil Shaver
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Solution Overview
Problem
Existing open cutters for foil type shavers lack optimal design for efficient hair cutting, with existing designs not fully utilizing the interaction between the cutter and foil to enhance cutting performance.
Innovation Solution
The open cutter features arch-shaped cutting strips with alternating parallel slots and cutting edges, where protruding and recessed edges are inclined at specific acute angles, allowing for continuous hair-lifting and cutting actions as the cutter oscillates, and is fabricated through stamping, shearing, and bending of a stainless steel metal plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the open cutter uses a simple bent metal sheet design, then the manufacturing process is simple, but the cutting efficiency and hair cutting performance are insufficient
Solution Approach 1:
The open cutter is divided into multiple cutting strips (first, second, third cutting strips) with different configurations. Each cutting strip has protruding cutting edges with specific acute angles (first acute angle for protruding edges, second acute angle for recessed edges) that are optimized for different cutting functions, thereby improving overall cutting efficiency while maintaining a relatively simple segmented structure
Solution Approach 2:
Different portions of the cutting strips are given different local properties: protruding cutting edges have a first acute angle (sharper angle for penetrating hair), recessed cutting edges have a second acute angle (larger angle for shearing), and the cutting strips are arranged at specific angles (oblique angle between 5°-15° or perpendicular) relative to the oscillating direction. This local differentiation optimizes the interaction with the foil and enhances cutting performance
2Productivity
If the cutting edges are designed with optimal angles for cutting performance, then hair cutting efficiency improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies particular parameter ranges for the acute angles (first acute angle for protruding edges, second acute angle for recessed edges) and the oblique angle of cutting strips (5°-15° or perpendicular to oscillating direction). By defining these parameters within specific ranges rather than requiring exact fixed values, the patent achieves optimized cutting performance while allowing for manufacturing tolerances, thus balancing performance with manufacturability
3Reliability
If the open cutter uses multiple cutting strips with protruding and recessed edges, then the interaction with foil is optimized for continuous hair-lifting and cutting, but the device complexity increases
Solution Approach 1:
The multiple cutting strips are arranged and configured so that as the open cutter oscillates, the protruding cutting edges of one strip interact with the recessed cutting edges of adjacent strips, creating continuous hair-lifting and cutting actions without interruption. This continuous interaction between adjacent strips ensures reliable cutting performance throughout the oscillating cycle
Solution Approach 2:
The patent combines multiple cutting strips with different edge configurations into a single integrated open cutter assembly. The protruding edges of one cutting strip work in conjunction with the recessed edges of adjacent strips, merging their functions to create a synergistic cutting system that achieves continuous reliable cutting action
Data Source
AI summary
An open cutter for a foil type shaver includes a plurality of arch-shaped cutting strips formed by bending a metal plate formed with alternating parallel slots and cutting strips. A plurality of spaced apart protruding cutting edges having a first acute cutting angle is formed along two opposite sides of the cutting strips. A plurality of recessed cutting edges having a second acute cutting angle is formed between the plurality of protruding cutting edges. The protruding cutting edges of one cutting strip are facing the recessed cutting edges of an adjacent cutting strip, thereby generating continuous hair-lifting and hair-cutting actions as the open cutter is driven in oscillating directions by a motor. A method for fabricating the open cutter is also disclosed.