Eccentric Pivot Axis Electric Beard Trimmer Cutter System
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Solution Overview
Problem
Existing cutter systems for electric shavers and trimmers face challenges in achieving close and thorough hair cutting while minimizing skin irritation and energy consumption, particularly when integrating comb-like cutting teeth and shear foil-like perforations in the same cutting elements, which often result in high friction, heat, and energy consumption.
Innovation Solution
The cutter system pivots about an eccentric pivot axis offset from the center, with one row of comb-like cutting teeth making shorter transverse movements and the other row making longer movements, reducing skin irritation and energy consumption by optimizing the pivot axis position relative to the cutting edges and skin contact surface, and using a biasing device to guide the cutting elements into a preferred pivoting position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If comb-like cutting teeth and shear foil-like perforations are integrated into the same cutting elements, then both long and short hair cutting functionality is achieved, but friction and energy consumption increase
Solution Approach 1:
The cutting system is divided into separate functional modules: a first cutting element with comb-like teeth for long hair and a second cutting element with shear foil-like perforations for short hair. This segmentation allows each module to operate independently with optimized friction characteristics, resolving the contradiction between versatility and energy consumption.
Solution Approach 2:
The patent combines multiple cutting functionalities into an integrated cutter system where comb-like teeth and shear foil perforations work together in a coordinated manner. The biasing device ensures both cutting elements maintain optimal contact with the skin, achieving versatile cutting performance while managing friction through controlled interaction between elements.
2Reliability
If the inner cutting element is biased against the outer cutting element, then tugging and pulling of hairs is avoided, but friction increases causing high energy consumption and heating
Solution Approach 1:
The biasing device provides dynamic adjustment of the contact force between cutting elements, allowing the system to adapt to varying hair lengths and skin contours. This dynamic biasing maintains reliable cutting action while minimizing excessive friction and heat generation through controlled interaction.
Solution Approach 2:
The patent optimizes the biasing force parameter to achieve the right balance between preventing hair tugging and minimizing friction. By carefully controlling the contact pressure between cutting elements, the system maintains reliable cutting performance while reducing energy consumption and heat generation.
3Object-affected harmful factors
If the pivot axis is positioned closer to one row of cutting teeth, then transverse movements of the leading edge are reduced, but the other cutting edge makes longer movements
Solution Approach 1:
The pivot axis is deliberately positioned asymmetrically closer to the first row of comb-like cutting teeth than to the second row. This asymmetric positioning reduces transverse movements of the leading cutting edge, minimizing skin irritation while the longer movements of the trailing edge maintain cutting efficiency through increased hair engagement.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention relates to cutting body hair such as beard stubbles of multidays' beard. More particularly, the present invention relates to a cutter system 3 for an electric shaver and/or trimmer 1, comprising a pair of cooperating cutting elements 4, 5 with two rows of comb-like cutting teeth 6, 7 at opposite edges thereof and at least one field of cutting perforations 8 between said rows of comb-like cutting teeth, which cutting perforations are formed in a skin contact surface or skin facing surface 50 of said cutting elements, wherein said cutting elements are movably supported relative to each other by a support structure 14 which provides for a pivot axis 21 about which said cooperating cutting elements are pivotable to follow the skin contour, said pivot axis extending substantially parallel to a longitudinal direction of said rows of comb-like cutting teeth. Said pivot axis is eccentrically positioned closer to a first one of said rows of comb-like cutting teeth than to a second one of said rows of comb-like cutting teeth, said first row of comb-like cutting teeth forming a leading edge going ahead when moving the cutter system along the skin in a common moving direction intuitively preferred by a majority of users and said second row forming a trailing edge.