Rotary Shaver Blade Guide Ring Alignment
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Solution Overview
Problem
Rotary electric shavers with annular shaving surfaces struggle to catch hairs radially inward, leading to reduced hair cutting performance, compromised sense of touch, and increased complexity due to additional components and machining requirements.
Innovation Solution
A rotary electric shaver design featuring an external outer blade with annular hair inlet holes and an internal outer blade with disk-shaped holes radially inward, combined with rotationally driven inner blades and guide rings for alignment, reduces heat generation and noise while maintaining hair cutting quality and improving picking and deep shaving abilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a recessed location for engaging the outer blade stator is disposed at the radial center position of the shaving surface, then the axes of the central outer blade and the corresponding inner blade can coincide with each other, but the sense of touch is worsened and the area for catching the hairs is reduced
Solution Approach 1:
The invention extracts the alignment function from the shaving surface by introducing a separate guide ring structure. The guide ring comes into sliding contact with the inner blade to provide alignment, while the shaving surface remains intact without recesses, thus preserving the sense of touch and hair catching area.
Solution Approach 2:
The guide ring acts as an intermediary component between the outer blade and inner blade. It provides the alignment function that was previously achieved through recesses in the shaving surface, but without compromising the shaving surface integrity.
2Productivity
If another shaving surface is added at the position radially inward of the annular shaving surface, then the hairs can be caught at the position radially inward, but the configuration becomes complicated due to increased number of components and machining man-hours
Solution Approach 1:
The guide ring serves multiple functions: it provides alignment between blades, supports the inner blade rotation, and enables the radially inward shaving surface to function properly. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The invention merges the alignment function and the support function into a single guide ring component. The guide ring integrates the alignment mechanism with the support structure for the inner blade, simplifying the overall configuration.
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
The design achieves favorable hair cutting quality, improved sense of touch, enhanced picking and deep shaving abilities, and simplifies the configuration with fewer components and reduced machining hours.
Implementation Method 1
The external inner blade has a plurality of guides which come into sliding contact with an inner peripheral surface of the guide ring
Data Source
AI summary
There is provided a rotary electric shaver which includes an external outer blade having a plurality of hair inlet holes on an annular shaving surface, an internal outer blade, a rotationally driven external inner blade having a plurality of small blades coming into sliding contact with a rear surface of the external outer blade, a rotationally driven internal inner blade, an external inner blade rest base, and an internal inner blade rest base. The external outer blade has a cylindrical guide ring formed on an inner peripheral side of an inner wall portion, and the external inner blade has a plurality of guides which come into sliding contact with an inner peripheral surface of the guide ring to perform radial alignment with respect to the external outer blade.