Shaving Head with Segmented Trimmer Units for Flat Hair Cutting
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Solution Overview
Problem
Existing shaving heads for electric dry shavers are ineffective in cutting hairs lying flat against the skin, particularly on flexible skin areas, and often cause skin irritations due to their design.
Innovation Solution
A shaving head with a combination of two trimmer-type cutting units and at least one foil-type cutting unit, featuring a plurality of slots and teeth, respectively, which work synergistically to lift and cut hairs effectively while minimizing skin irritation through adjustable mounting and a skin-protecting guard element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a center trimmer with projecting teeth is used to cut hairs, then cutting effectiveness is improved, but hairs lying flat against the skin escape from the feeding area and are not cut
Solution Approach 1:
The trimmer head is divided into multiple independent trimmer units (first and second trimmer units) with different cutter configurations. Each trimmer unit has a distinct outer cutter design (one with slots, one with teeth) that can handle different hair types and orientations, allowing the system to address both standing hairs and flat-lying hairs effectively
Solution Approach 2:
Different regions of the trimmer head have specialized cutting elements tailored to local needs. The first trimmer unit with slots is positioned to handle certain areas while the second trimmer unit with teeth handles other areas, creating localized optimization for cutting different orientations of hairs across the shaving surface
2Stability of the object's composition
If an expanded comb center trimmer is used, then mechanical stability is improved, but the trimmer acts like a comb and directs hairs without cutting them, causing skin irritations
Solution Approach 1:
The single expanded comb center trimmer is segmented into two separate trimmer units with different functions. One unit focuses on cutting (with teeth) while the other provides structural stability (with slots), separating the combing function from the cutting function to avoid skin irritation while maintaining mechanical stability
Solution Approach 2:
The harmful combing action is extracted and separated from the cutting function. The slot-based trimmer unit provides structural support without the aggressive combing effect, while the tooth-based unit provides cutting without the stabilizing comb structure that causes irritation
3Productivity
If multiple cutting units are added to improve shaving quality, then cutting performance is improved, but device complexity increases
Solution Approach 1:
The complex shaving head is segmented into modular trimmer units that can be independently manufactured and assembled. Each unit is a self-contained module with its own outer cutter and mounting structure, making the overall complex system easier to manufacture, assemble, and maintain through standardization of these modular components
Solution Approach 2:
Multiple cutting functions are merged into a single integrated trimmer head assembly where the first and second trimmer units work in coordination. This combines the benefits of different cutting mechanisms (slots and teeth) into one unified device rather than requiring separate devices, managing complexity through functional integration
Data Source
AI summary
A shaving head for an electric dry shaver includes a base element for carrying at least three cutter units. Each unit provides an outer cutter and an inner cutter arranged to be moved in sliding contact relative to each other. At least one cutter unit includes a foil-type outer cutter. The shaving head further includes a first trimmer-type cutting unit that has a plurality of slots defined by a plurality of adjacent bar elements featuring cutting edges. The shaving head also includes a second trimmer-type cutting unit having an outer cutter that includes a plurality of teeth featuring cutting edges and spaced apart from each other so as to define a plurality of slits.