Wristwatch Pointer Segmentation for Thin Shaft Molding
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Solution Overview
Problem
Existing pointer designs for wristwatches face limitations in making the pointer shaft thin due to the requirement for a large outer diameter to accommodate the pointer attachment section, restricting the inner diameter and hindering the molding process.
Innovation Solution
A pointer design featuring a metal pointer attachment section with a large-diameter section for mold fixation and a small-diameter section for the shaft, allowing for a thin sub-pointer shaft and efficient molding of the synthetic resin pointer body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner diameter of the pointer attachment section is made larger to accommodate the positioning pin, then the pointer body can be favorably molded, but the outer diameter of the pointer shaft becomes large and cannot be formed to be thin
Solution Approach 1:
The pointer attachment section is divided into two distinct sections: a large-diameter section for mold fixation and a small-diameter section for the pointer shaft. This segmentation allows each section to serve its specific function optimally - the large-diameter section accommodates the positioning pin for proper molding, while the small-diameter section enables a thin pointer shaft.
Solution Approach 2:
Different parts of the pointer attachment section have different diameters tailored to their specific functions. The large-diameter section provides sufficient space for positioning pin insertion and mold fixation, while the small-diameter section is optimized for minimizing pointer shaft thickness. This local differentiation of dimensions resolves the contradiction between molding requirements and shaft thinness.
2Reliability
If the outer diameter of the pointer shaft is made large to accommodate the positioning pin, then the pointer body can be securely fixed in the mold, but the pointer shaft cannot be formed to be thin
Solution Approach 1:
The fixation function and the shaft function are segmented into different sections. The large-diameter section handles the fixation requirement by accommodating the positioning pin, while the small-diameter section handles the shaft function with minimized thickness. This segmentation allows reliable fixation without compromising shaft thinness.
Solution Approach 2:
The positioning pin accommodation function is extracted from the pointer shaft and placed in the large-diameter section of the pointer attachment section. This extraction allows the pointer shaft to be thin while the fixation requirement is satisfied by the separate large-diameter section that receives the positioning pin.
Data Source
AI summary
A pointer including a pointer body formed of synthetic resin, and a pointer attachment section formed of a material harder than the synthetic resin and provided in a rotation center portion of the pointer body, in which the pointer attachment section comprises a large-diameter section to which the pointer body is fixed and which includes a positioning section, and a small-diameter section which is provided coaxially with the large-diameter section and to which a pointer shaft is attached.