Intimate Trimmer Cutter Head With Recessed Teeth and Shear Foil
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Solution Overview
Problem
Existing hair cutters with both rake-like and shear foil cutting systems risk skin irritations and injuries, especially in sensitive areas, due to the rake-like elements interfering with the skin and preventing short stubbles from entering the shear foil perforations.
Innovation Solution
A cutter head design with a protective attachment that recesses the rake-like cutting teeth and positions the shear foil system for direct skin contact, allowing stubbles to enter the perforations while preventing skin wrapping around the teeth tips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rake-like cutting elements are positioned close to the skin to cut long hairs efficiently, then the cutting performance is improved, but the risk of skin irritation and injury increases
Solution Approach 1:
The cutter head is divided into functionally separate zones: a first cutter unit with rake-like elements for long hair cutting, and a second cutter unit with shear foil for short stubble removal. This segmentation allows each unit to operate at optimal distance from the skin for its specific function, resolving the contradiction between close-contact cutting efficiency and skin safety.
Solution Approach 2:
The skin contact surface acts as an intermediary element between the cutting elements and the skin. It provides a protective barrier that prevents direct contact between the rake-like cutting elements and the skin, allowing the cutters to operate close to the skin for efficient long hair cutting while the skin contact surface absorbs the harmful contact effect.
2Manufacturing precision
If the rake-like cutting elements are positioned close to the skin to leave short stubbles, then the stubble length is reduced, but the skin wrapping around the tooth tips causes irritations
Solution Approach 1:
The cutting system is segmented into two functional units: the first cutter unit positioned close to the skin contact surface for precise stubble length control, and the second cutter unit positioned further away for safe skin contact. This segmentation allows precise stubble trimming without the skin wrapping hazard.
Solution Approach 2:
The problem is solved by transitioning from a single-plane cutting arrangement to a multi-dimensional configuration where the two cutter units are positioned at different distances from the skin along the depth dimension. This dimensional separation allows one cutter to control stubble length while another provides safe skin contact.
3Object-affected harmful factors
If the protective attachment recesses the cutting teeth to protect skin, then skin safety is improved, but the stubbles cannot reach the shear foil perforations effectively
Solution Approach 1:
The protective function is segmented between the skin contact surface and the cutter units. The skin contact surface provides the protective barrier, while the first cutter unit positioned in front of it ensures stubbles are cut short enough to enter the shear foil perforations, resolving the contradiction between protection and cutting effectiveness.
Solution Approach 2:
The first cutter unit performs a preliminary cutting action on long hairs before they reach the shear foil system. This preliminary action reduces the hair length to an appropriate size that can then effectively enter the shear foil perforations, ensuring the protective attachment does not interfere with the second cutting stage.
4Device complexity
If a single cutter unit is used for both long hair and short stubble cutting, then the device complexity is reduced, but the cutting quality and skin safety deteriorate
Solution Approach 1:
The cutter head is segmented into two specialized cutter units: one optimized for long hair cutting with rake-like elements, and another optimized for short stubble removal with shear foil. This segmentation provides superior cutting quality and skin safety compared to a single-unit system, while the modular design keeps the overall device complexity manageable.
Solution Approach 2:
The cutter head assembly serves multiple functions through its two cutter units: the first unit handles long hair trimming while the second unit performs close-to-skin stubble removal. This multi-functionality within a single cutter head component allows one device to perform both cutting tasks effectively without requiring separate tools.
Data Source
AI summary
The present invention relates to a cutter head for an intimate trimmer, comprising a cutter head frame attachable to an elongated handle, a pair of cooperating cutter blades each having at least one row of comb-like cutting teeth for long hair cutting and movable relative to each other, and a shear foil system with at least one field of perforations for short hair cutting arranged on a rear or trailing side of said at least one row of comb-like cutting teeth, and furthermore, a protective attachment for protecting skin from being cut by said comb-like cutting teeth, wherein said protective attachment includes a row of comb-like protective teeth, wherein said cutting teeth for long hair cutting are arranged in a countersunk position below a virtual tangential plane onto said shear foil system and said comb-like protective teeth of said protective attachment.