Rotary Shaving Cutter with Segmented Apertures and Fixed Blade
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Solution Overview
Problem
Current shaving methods, such as razor blades and motorized screens, face challenges in providing a safe and efficient close shave due to the risk of nicks, uneven hair cutting, and the need for constant motion to optimize cutting conditions.
Innovation Solution
A shaving apparatus utilizing a rotary cutter with a closed-geometry cutting tube and a fixed blade, driven by an electric motor, which shears hair between the cutting edges of the rotary cutter and the fixed blade, with optional lubrication and adaptive aperture patterns to optimize cutting efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sharp razor blade is used to cut hair, then cutting efficiency is improved, but the risk of nicks and cuts increases
Solution Approach 1:
The cutting function is divided between multiple cutting elements (first cutting element on the screen and second cutting element on the rotary cutter) working in coordination, allowing each element to contribute to cutting without requiring extreme sharpness, thereby reducing the risk of skin injury while maintaining cutting efficiency
Solution Approach 2:
A screen is introduced as an intermediary element between the cutting elements and the skin. The screen allows hair to pass through while preventing direct contact between the cutting elements and the skin, enabling efficient cutting without the harmful effect of nicks and cuts
2Reliability
If a screen is used to separate skin and cutting elements, then safety is improved, but cutting closeness deteriorates
Solution Approach 1:
The cutting system is segmented into multiple cutting elements positioned at different locations, with the first cutting element on the screen providing initial cutting and the second cutting element on the rotary cutter providing final close trimming, thereby achieving both safety and cutting closeness
Solution Approach 2:
The cutting action is extended from a single-plane screen approach to a multi-dimensional approach where cutting occurs at multiple positions and angles (screen cutting element plus rotary cutter element), enabling close shaving while maintaining the safety benefit of screen separation
3Productivity
If the screen is constantly moved across the skin, then cutting optimality is improved, but operational complexity increases
Solution Approach 1:
The rotary cutter automatically performs the cutting function through rotation driven by an electric motor, eliminating the need for manual manipulation or constant movement of the screen. The system serves itself by using the rotation to bring cutting elements into contact with hair passing through the screen, simplifying operation while maintaining cutting optimality
4Reliability
If a rotary cutter with closed-geometry cutting tube is used, then cutting safety and efficiency are improved, but device complexity increases
Solution Approach 1:
The rotary cutter with closed-geometry cutting tube performs multiple functions: it rotates to bring cutting elements into contact with hair, the closed geometry contains and guides hair through the cutting zone, and the structure itself provides safety containment. This multi-functionality reduces the need for additional separate components, managing device complexity while improving safety and efficiency
Data Source
AI summary
A shaving apparatus in which a rotary cutter and a fixed blade are used to shear a user's hairs therebetween during a shaving process. Rotation of the rotary cutter is driven by an electric motor. In certain embodiments, the rotary cutter comprises a cutting tube that comprises a plurality of apertures that are defined by cutting edges which form a closed-geometry. In other embodiments, a lubricating element is coupled to the rotary cutter. In further embodiments, the apertures are arranged in a pattern to control the number and selection of apertures that are capable of being active to shear hairs at any one time. In even further embodiments, the fixed blade is integrally formed with the housing of the head; the housing is formed by a plurality of flat plate segments; the rotary cutter is formed by a plurality of stacked flat plate segments; and/or the fixed blade can reciprocate.