Horological Winding Stem Internal Stop Design
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Solution Overview
Problem
Existing horological movements with setting and winding mechanisms face challenges such as premature wear of components due to sensitive 90° gearing and the need for external stops that require complex machining and can cause contact surface deterioration.
Innovation Solution
A horological movement with a setting and winding mechanism that includes a winding stem with a positioning stop internal to the movement, which axially stops the winding stem in the winding position, eliminating the need for external stops and ensuring optimal gearing between the winding pinion and the winding crown-wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external stop collar is added to the winding stem to prevent premature wear of the toothing, then the reliability of the gearing is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the stop function from the external collar structure and integrates it directly into the winding stem itself. The winding stem includes an axial stop surface that performs the positioning function without requiring separate external stop components, thereby simplifying the overall structure while maintaining gearing reliability.
Solution Approach 2:
The invention merges the stop function with the winding stem structure. The axial stop surface is formed as an integral part of the winding stem, combining the positioning function with the existing stem structure rather than adding separate external stop components.
2Reliability
If an external stop collar is used to position the winding stem, then the gearing reliability is improved, but the manufacturing precision requirements increase due to tolerance chains
Solution Approach 1:
The invention extracts the positioning function from complex external stop structures and embeds it directly in the winding stem. The axial stop surface is formed as part of the stem itself, eliminating the need for separate stop collars and reducing the cumulative tolerance chain while maintaining precise positioning.
3Measurement precision
If an external stop collar is added to the winding stem, then the positioning accuracy is improved, but the contact surface deterioration and filings increase
Solution Approach 1:
The invention merges the stop function with the winding stem structure. The axial stop surface is formed as an integral part of the winding stem, combining the positioning function with the existing stem structure rather than adding separate external stop components.
Solution Approach 2:
The invention uses the same material (steel) for both the winding stem and the axial stop surface. This homogeneity eliminates the dissimilar metal contact that occurs with external brass collars, preventing galvanic corrosion and filings generation while maintaining positioning accuracy.
Data Source
AI summary
A horological movement including a mechanism for setting and winding the horological movement, the setting and winding mechanism including a winding stem with an axis of revolution (X), having a first end cooperating with a winding button and a second end opposite the winding button, the winding stem being movable rotatably and translatably along the axis of revolution (X) between a first axial position (T1) of the winding stem in which the rotation of the winding stem winds the horological movement, and a second axial position (T2) of the winding stem in which the rotation of the winding stem sets a function of the horological movement, wherein the setting and winding mechanism includes a positioning stop configured to cooperate, by contact, with the second end of the winding stem to stop the winding stem axially in the first axial position (T1).