Moon Phase Indicator Mechanism for Timepiece
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Solution Overview
Problem
Conventional moon phase indicator mechanisms in timepieces are not realistic, energy-intensive, and require actuation at a specific time, leading to increased watch case thickness and aesthetic issues due to component overload.
Innovation Solution
A compact moon phase mechanism featuring a moon phase train driven by the timepiece movement, meshing with a toothed ring to simulate lunar cycles accurately, using a single moon disc and an intermediate part mounted on a toothed ring with a specific toothing arrangement, and a correction device for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional moon phase mechanism is used, then the moon phase display can be achieved, but the watch case thickness increases due to component overload
Solution Approach 1:
The moon phase mechanism is nested within the existing movement structure. The moon phase wheel is integrated into the gear train, with the moon disc mounted on the moon phase wheel that rotates within the confines of the movement, allowing the mechanism to fit without increasing case thickness
Solution Approach 2:
The moon phase wheel is positioned in a different spatial dimension within the movement, utilizing the depth and layering of the gear train rather than adding components in the radial direction, thereby maintaining a slim profile
2Ease of operation
If the moon phase indicator is actuated once per day, then the mechanism is simple to operate, but the display does not provide a realistic representation of moon phases
Solution Approach 1:
The moon phase wheel is continuously driven by the movement's gear train, receiving continuous rotational force from the mainspring through the hour wheel and intermediate gears, ensuring the moon disc moves continuously rather than in discrete daily steps, providing a realistic and accurate representation of lunar phases
Solution Approach 2:
The movement's existing gear train serves dual purposes: driving the timekeeping function and simultaneously driving the moon phase indication, eliminating the need for a separate actuation mechanism and enabling continuous operation
3Reliability
If the moon phase mechanism requires actuation at a predetermined time, then the mechanism can function, but it causes accumulation of functions at midnight leading to loss of amplitude in the sprung balance
Solution Approach 1:
The moon phase indication operates continuously through the gear train driven by the mainspring, distributing the energy demand evenly throughout the power reserve period rather than concentrating it at a specific time, thus preventing amplitude loss in the sprung balance
Solution Approach 2:
The moon phase driving mechanism is merged with the timekeeping gear train, sharing the same power source and energy pathway, so that the energy required for moon phase indication is drawn from the same mainspring that drives the timekeeping function, eliminating additional energy demands
Data Source
AI summary
A moon phase indicator mechanism, for a timepiece provided with a movement and a dial, the moon phase indicator mechanism including at least one moon disc, and at least one moon phase train driven by the timepiece movement, the moon phase train meshing with a moon phase wheel which carries the moon disc at least indirectly and in a fixed manner, the moon phase wheel taking the form of a toothed ring in order to move the moon disc with the moon phase train about an axis A.