Concentric Wheel Power Reserve Display Eliminates Differential
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Solution Overview
Problem
Conventional power reserve displays in mechanical watches rely on bulky differential mechanisms, which are sensitive to shocks and expensive, necessitating a more simplified and robust solution.
Innovation Solution
A timepiece mechanism utilizing two concentric wheels with internal stop surfaces and friction means to drive and disengage, eliminating the need for a differential, allowing for efficient power reserve display with reduced complexity and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a differential mechanism is used for power reserve display, then measurement precision and reliability are improved, but device complexity, size, and cost increase
Solution Approach 1:
The patent extracts the essential function of the differential mechanism (collecting charging and discharging information) and implements it through a simplified system consisting of a single wheel driven by both winding and running geartrains, eliminating the need for a complex differential assembly while maintaining the ability to display power reserve accurately
Solution Approach 2:
The single display wheel serves multiple functions: it indicates both the power reserve level through its position and provides visual feedback about winding status through the interaction of stop surfaces with the winding geartrain, replacing the specialized functions previously requiring separate differential components
2Measurement precision
If a differential mechanism is used for power reserve display, then measurement precision is improved, but the mechanism becomes sensitive to shocks and more expensive
Solution Approach 1:
By removing the differential mechanism entirely and using a direct drive system where a single wheel is driven by both winding and running geartrains, the patent eliminates the sensitive internal components of the differential that are vulnerable to shock, while maintaining accurate power reserve indication through the wheel's position relative to a fixed scale
3Measurement precision
If a differential mechanism is used for power reserve display, then power reserve indication accuracy is improved, but the mechanism size and thickness increase
Solution Approach 1:
The patent merges the functions of the differential mechanism, winding indicator, and power reserve indicator into a single integrated wheel system. The display wheel is driven simultaneously by the winding geartrain (through stop surfaces) and the running geartrain, combining multiple functions into one compact component that maintains accuracy while reducing thickness
4Measurement precision
If a differential mechanism is used for power reserve display, then power reserve indication accuracy is improved, but manufacturing cost increases
Solution Approach 1:
By extracting and eliminating the differential mechanism, the patent significantly reduces the number of precision components required. The simplified system using a single wheel with stop surfaces driven by existing geartrains reduces manufacturing complexity and cost while maintaining the core function of accurate power reserve indication
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a compact, shock-resistant, and cost-effective power reserve display mechanism that accurately indicates the energy level without the bulkiness and fragility of traditional differential-based systems.
Implementation Method 1
a friction (which can be incorporated in the differential), absorbs the rotations of the geartrain relative to the hand in a fixed position on the maximum or minimum stop
Data Source
AI summary
A timepiece including a timepiece mechanism (200) and a display device (100) for displaying a magnitude relating to the timepiece mechanism (200), in combination on wheels (1 2) driven by rotational movements in the same direction of rotation by at least one output (3; 4) of the timepiece mechanism (200), at least one wheel (1; 2) being integral in rotation with an indicator (60) to display a representation of this magnitude by the angular difference between the wheels (1; 2) or between a wheel (1; 2) and a fixed scale, the timepiece mechanism (200) driving, at a given time, a single wheel (1; 2) by a single output (3; 4), the display device (100) driving one of the wheels (1; 2) by another, and the display device and/or the timepiece mechanism can disengage in at least one end-of-travel position of a wheel (1; 2).