Reciprocating Shaver Blade Frame Positioning Mechanism
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Solution Overview
Problem
Existing reciprocating-type electric shavers have complex mechanisms with numerous components and assembly processes due to the need for vertical movement of blade units, which complicates the oscillation and positioning of the head unit.
Innovation Solution
A simplified mechanism where at least one blade unit in the head unit is vertically movable between predetermined positions using a positioning lever, reducing the number of components and assembly processes, while maintaining effective oscillation and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanisms for vertically moving blade units are arranged in the main body and connected to the head unit, then blade unit positioning is enabled, but the mechanisms and head unit become very complicated with increased number of components and assembly processes
Solution Approach 1:
The blade frame is divided into a stationary portion and a movable portion that can independently move vertically. The movable blade unit is mounted on the movable portion, allowing positioning without requiring complex mechanisms in the main body. This segmentation separates the positioning function from the main body mechanisms, reducing overall system complexity while maintaining adaptability.
Solution Approach 2:
Instead of moving the entire head unit vertically through complex mechanisms in the main body, the invention inverts the approach by keeping the head unit oscillating mechanism simple and allowing only the blade frame portion to move vertically. This reversal of the movement scope simplifies the main body mechanisms while achieving the same positioning capability.
2Adaptability or versatility
If multiple mechanisms are arranged in the main body to enable head unit oscillation and blade unit vertical movement, then both functions are achieved, but the number of components and assembly processes increases
Solution Approach 1:
The oscillation mechanism and the vertical movement mechanism are merged into a coordinated system where the oscillation of the head unit and the vertical movement of the blade frame work together. The positioning lever integrates both oscillation control and vertical positioning functions, reducing the number of separate mechanisms and simplifying assembly processes.
Solution Approach 2:
The positioning lever serves multiple functions: it controls the oscillation of the head unit, enables vertical movement of the blade frame, and positions the blade unit. This multi-functionality reduces the number of components needed and simplifies the assembly process while maintaining both oscillation and positioning capabilities.
3Measurement precision
If complex mechanisms are used for head unit oscillation and blade unit movement, then positioning accuracy is improved, but power consumption and abrasion loss increase
Solution Approach 1:
The blade frame is designed with dynamic capability to move vertically while the head unit oscillates. The positioning lever dynamically adjusts the blade frame position during operation, allowing accurate positioning without requiring overly complex rigid mechanisms. This dynamic approach reduces friction and wear while maintaining positioning accuracy.
Solution Approach 2:
The invention changes the operational parameters by allowing the blade frame to move vertically in coordination with the oscillation cycle. This parameter change enables precise positioning through controlled movement rather than complex mechanical linkages, reducing power consumption and abrasion loss while maintaining positioning accuracy.
Data Source
AI summary
A reciprocating-type electric shaver 10 includes a head unit 20 that is arranged so as to be capable of oscillating at least forward to and rearward from a main body 12. The head unit 20 has multiple blade units 40, 50, 60, and 70 whose inner blades 46, 56, 66, and 76 come into sliding contact with an inner surface of outer blades 44, 54, 64, and 74 and reciprocate rightward and leftward. At least one of the blade units is configured to serve as a movable blade unit 40 which is held by a blade frame 26 of the head unit 20 so as to be vertically movable from the reference position between a predetermined upper position and a predetermined lower position, and the blade frame 26 has a positioning lever 28 which performs positioning by moving the movable blade unit 40 to a desired position.