Watch Stud With Groove And Slit For Hairspring Fixation
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Solution Overview
Problem
Existing stud designs for mechanical watches with hairsprings require complex machining processes, leading to poor manufacturing efficiency and a risk of adhesive failure due to insufficient fixation strength.
Innovation Solution
A stud design featuring a columnar support with a truncated conical spring receiving portion and an annular groove on the outer periphery, where the slit portion for the hairspring is integrated with the groove to secure an adhesive, enhancing fixation and preventing adhesive dropout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through hole is provided in the side wall of the slit portion to prevent adhesive dropout, then adhesive fixation is improved, but the structure becomes complicated and manufacturing efficiency deteriorates
Solution Approach 1:
The groove and slit portion are merged into a single integrated structure formed by one machining process, eliminating the need for separate through holes or notches. The groove forms a constricted portion on the outer periphery that integrates with the slit portion to prevent adhesive dropout while simplifying manufacturing.
Solution Approach 2:
The stud is divided into functionally distinct portions: the support portion formed into a column and the spring receiving portion formed into a truncated conical shape. This segmentation allows each portion to be optimized for its specific function while being manufactured through coordinated machining processes.
2Adaptability or versatility
If multiple different machining processes are used for the columnar stud and slit portion, then structural functionality is improved, but the number of machining processes increases and manufacturing efficiency deteriorates
Solution Approach 1:
The groove serves multiple functions: it forms a constricted portion on the outer periphery, integrates with the slit portion to prevent adhesive dropout, and is formed through a machining process that is compatible with the overall stud manufacturing workflow. This multi-functionality reduces the need for separate specialized features.
3Strength
If the slit portion is formed deeply to ensure hairspring fixation, then fixation strength is improved, but the risk of adhesive dropout increases
Solution Approach 1:
The groove is formed in advance to create a constricted portion that prevents adhesive dropout before the adhesive is applied and cured. This preliminary structural feature counteracts the potential failure mode of adhesive dropout, ensuring both deep fixation and adhesive retention.
Data Source
AI summary
A stud includes a support portion formed into a shape of a column, and a spring receiving portion being provided on the support portion and including a slit portion to which a hairspring is to be inserted and fixed. The spring receiving portion is formed into a truncated conical shape centered on a center line that passes through the center of the column. The groove that forms a constricted portion on an outer periphery is provided between the support portion and the spring receiving portion. The slit portion is a notch portion that is formed from an upper surface toward a bottom surface of the spring receiving portion in the truncated conical shape, and thrusts into a portion of the groove.