Oscillating Piece Tilt for Reciprocating Shaver Durability
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Solution Overview
Problem
The existing reciprocating-type electric shavers face a waving phenomenon in oscillating pieces at higher rotation speeds, leading to premature failure when the inner blade is driven at speeds exceeding 8,000 rpm.
Innovation Solution
The oscillating pieces in the oscillator are tilted orthogonally at a specific angle (0.5° to 15°) to the reciprocating direction, with the lower portion open outward, ensuring the outermost end is beyond half the maximum reciprocating distance, thereby preventing waving and maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the motor is increased to approximately 10,000 rpm to improve shaving performance, then the productivity and effectiveness of the shaver is improved, but the support portions having a substantially U-shape cannot fully respond to the high rotation speed, causing a waving phenomenon in the oscillating pieces that leads to premature failure
Solution Approach 1:
The support portions are changed from a symmetric U-shape to an asymmetric structure where one linear portion is formed in thin flexible oscillating pieces while the other linear portion is formed in a thick rigid support piece. This asymmetric design allows the thin oscillating pieces to provide necessary flexibility for high-speed reciprocating motion while the thick rigid support piece provides structural stability and prevents waving phenomenon, thereby resolving the contradiction between improving shaving speed and maintaining durability.
2Ease of operation
If the oscillating pieces are made thin to provide flexibility for reciprocating motion, then the ease of operation and shaving comfort is improved, but the strength and resistance to waving at high speeds deteriorates
Solution Approach 1:
The support portions are segmented into two distinct components: thin flexible oscillating pieces and a thick rigid support piece. The thin oscillating pieces are positioned to contact the inner blade and provide flexibility for smooth reciprocating motion and shaving comfort, while the thick rigid support piece provides structural reinforcement to prevent waving phenomenon at high speeds. This segmentation allows each component to optimize its function without compromising the other, resolving the contradiction between ease of operation and strength.
Data Source
AI summary
A reciprocating-type electric shaver includes an outer blade, an oscillator that is driven to reciprocate by a motor, and an inner blade that reciprocates in cooperation with the oscillator. The oscillator includes attachment portions that are respectively attached to a main body, a movable base, both end sides of which are supported by the attachment portions via support portions having a substantially U-shape, and a cooperation portion that cooperates with the inner blade. In the respective support portions, a portion on a side connected to the attachment portion in a base portion, which is one linear portion of the U-shape, is formed in flexible oscillating pieces. The respective oscillating pieces are formed to be tilted in a direction orthogonal to a reciprocating direction of the movable base so that a lower portion side of the respective oscillating pieces is open outward in the reciprocating direction of the movable base.