Rotary Shaver Hair-Cutting Unit Adjustment for Consistent Exposure
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Solution Overview
Problem
Existing rotary electric shavers face challenges in achieving a balance between shaving closeness and user comfort, with adjustment systems for exposure distance often resulting in inconsistent initial settings after assembly or disassembly, and there is a need for a synchronized and cost-effective solution.
Innovation Solution
A hair-cutting unit with an adjustment system that includes a guiding channel and following element, allowing for synchronized setting of the exposure distance through a conversion mechanism, using a stop arrangement to maintain initial positions and prevent arbitrary changes during reassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an adjustment system is provided to allow users to set exposure distance, then user comfort and shaving closeness can be optimized, but inconsistent initial settings occur after assembly or disassembly
Solution Approach 1:
The guiding channel is pre-configured with a specific geometric shape that automatically guides the following element to a predetermined initial position when the external cutting member is mounted onto the supporting member. This preliminary structural arrangement ensures that the exposure distance is consistently initialized without requiring additional adjustment steps or complex synchronization mechanisms.
2Ease of operation
If a conversion mechanism is used to convert rotation into axial movement for adjustment, then the adjustment system becomes more controllable, but the device complexity increases
Solution Approach 1:
The guiding channel's geometric shape itself performs the conversion function from rotational movement to axial displacement. The inclined or curved surface of the guiding channel automatically transforms the rotation of the external cutting member into controlled axial movement of the following element, eliminating the need for separate conversion components and reducing overall system complexity.
3Productivity
If multiple hair-cutting units are used in a shaving assembly, then productivity increases, but synchronization of exposure distance settings becomes difficult
Solution Approach 1:
Each hair-cutting unit is equipped with its own independent guiding channel and following element combination. This segmentation allows each unit to independently establish its exposure distance setting through the self-guiding mechanism, ensuring that all units maintain consistent settings without requiring complex inter-unit synchronization systems.
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
Ensures consistent exposure distance settings across multiple hair-cutting units, maintaining user-defined comfort and closeness without increasing complexity or size, using a mechanical system with synchronized actuation.
Implementation Method 1
the guiding channel is inclined relative to an imaginary surface perpendicular to the central axis, and is provided on one of i) an inner surface of the supporting member surrounding the external cutting member and ii) a circumferential outer surface of the external cutting member
Data Source
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.