Multi-Head Electric Shaver With Rotating Screens for Uniform Cutting
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Solution Overview
Problem
Existing multi-head shavers have stationary screens and rotating blades, making it difficult for longer hair to enter the screen for complete cutting, leading to uneven shaving and hair trapping issues.
Innovation Solution
A dual-power multi-head electric shaver with a first gear set for rotating blades and a second gear set for rotating screens, driven by separate motors, allowing blades to rotate rapidly and screens to rotate slowly, facilitating thorough cutting of long hair and guiding short hair from multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple shaver heads are arranged on a shaver, then shaving efficiency is improved, but hair trapping problem occurs leading to poor user experience
Solution Approach 1:
The patent applies dynamics by making the screen rotate in the same direction as the blade but at a different speed. This dynamic movement of the screen prevents hair from being trapped between the blade and screen, solving the hair trapping problem while maintaining multi-head shaving efficiency
Solution Approach 2:
The patent changes the parameter of screen motion from stationary to rotating at a specific speed ratio (0.3-0.7 times the blade speed). This parameter change allows hair to be smoothly guided through the shaving mechanism without trapping, improving user experience while preserving productivity
2Device complexity
If screens remain stationary while blades rotate, then structure is simple, but longer hair cannot enter the screen to be cut resulting in uneven and incomplete shaving
Solution Approach 1:
The patent introduces dynamic motion to the screen by rotating it in the same direction as the blade. This dynamic action creates a guiding effect that draws longer hair into the cutting zone, ensuring complete and uniform shaving while maintaining relatively simple structure
Solution Approach 2:
The patent employs periodic rotation of the screen synchronized with blade rotation. This periodic motion continuously presents fresh screen surface to incoming hair, ensuring consistent cutting quality and uniform shaving results
3Manufacturing precision
If screens rotate slowly while blades rotate rapidly, then long hair can be captured and cut thoroughly, but device complexity increases due to dual motor system
Solution Approach 1:
The patent segments the driving function by using two separate motors: one for the blade and one for the screen. This segmentation allows independent optimization of each component's speed and torque characteristics, achieving thorough cutting of long hair while managing system complexity through modular design
Solution Approach 2:
The patent makes the screen multi-functional by giving it both a guiding function (directing hair to the blade) and a cutting assistance function (rotating to expose different hair sections). This multi-functionality justifies the additional motor, as the screen now performs multiple roles that improve shaving completeness
Data Source
AI summary
The invention provides a dual-power multi-head electric shaver, which is characterized by comprising a main body housing and a main body bottom case, wherein a detachable multi-head shaving component is arranged above the main body housing, and the shaving component comprises a plurality of screens; and blades are correspondingly arranged in the screens, a first gear set for driving the blades to rotate is arranged below the shaving component, a second gear set for driving the screens to rotate is arranged in the shaving component, and a first motor and a second motor for respectively driving the first gear set and the second gear set to rotate are arranged in the main body housing. The blades and screens of the invention can both rotate, allowing for easy guiding of long and short hair into the screens for cutting, resulting in a cleaner and more uniform shaving effect.