Rotary Electric Shaver Hair-Cutting Units for Synchronized Exposure Distance
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Solution Overview
Problem
Existing rotary electric shavers face challenges in achieving a synchronized and defined exposure distance setting between hair-cutting units, which affects shaving closeness and comfort, often requiring complex components or increased size.
Innovation Solution
A hair-cutting unit with an adjustment system that includes a conversion mechanism using guiding channels and following elements, allowing for synchronized exposure distance setting through relative rotation and axial movement of external and supporting members, featuring a stop arrangement to maintain initial positions and prevent arbitrary settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complex adjustment system with multiple components is used to achieve synchronized exposure distance setting, then the exposure distance can be adjusted, but the device complexity increases
Solution Approach 1:
The patent combines the adjustment actuator and the transmission mechanism into an integrated unit where the actuator directly engages with the inclined guiding channel. This merging eliminates the need for separate synchronization mechanisms and reduces the number of components while maintaining precise exposure distance control across multiple hair-cutting units.
Solution Approach 2:
The inclined guiding channel acts as an intermediary element that converts rotational movement into axial displacement. This intermediary mechanism enables synchronized adjustment of exposure distance without requiring complex direct coupling between multiple cutting units, simplifying the overall system architecture.
2Manufacturing precision
If the adjustment system uses multiple transmission components to convert rotation to axial movement, then the exposure distance can be controlled, but the size of the hair-cutting unit increases
Solution Approach 1:
The patent utilizes the inclined angle of the guiding channel to convert rotational movement into axial displacement along a different dimension. This dimensional transformation allows for compact packaging of the adjustment mechanism within the hair-cutting unit without increasing its overall volume, while still achieving precise exposure distance control.
3Adaptability or versatility
If the guiding channel is inclined relative to the perpendicular surface, then rotation can be converted to axial movement, but the structural complexity increases
Solution Approach 1:
The inclined guiding channel serves multiple functions simultaneously: it guides the following element, converts rotational to axial movement, and provides mechanical advantage for adjustment. This multi-functionality reduces the need for additional specialized components, thereby simplifying the overall structure despite the inclined geometry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables synchronized exposure distance settings between hair-cutting units, ensuring consistent shaving performance and comfort without adding complexity or size, using a common adjustment actuator and synchronization mechanism.
Implementation Method 1
the conversion mechanism comprises at least one set of a guiding channel and a following element engaging the guiding channel; the guiding channel is inclined relative to an imaginary surface perpendicular to the central axis
Data Source
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AI summary
In a hair-cutting unit for a rotary electric shaver, which is of the type comprising an external cutting member (10), an internal cutting member and a supporting member (30), an exposure distance over which a skin-contacting surface of a shaving track of the external cutting member (10) protrudes relative to an upper surface of the supporting member (30) is adjustable. To this end, an adjustment system is provided, which comprises, among other things, at least one adjustment set of a guiding channel and a following element (42) engaging the guiding channel, and also an initial position setting system configured to enable synchronization of the exposure distance setting between a number of the hair-cutting units, during which an initial position of the following element (42) in the guiding channel defined by a stop arrangement of the guiding channel is realized and maintained.