Adapting Watch Movements for Low-Pressure Operation
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Solution Overview
Problem
Designing a mechanical watch movement to operate effectively in a protected low-pressure atmosphere is complex and inefficient, as existing methods do not provide practical guidance for adapting movements from ambient atmospheric pressure to low-pressure operation.
Innovation Solution
A method involving measuring the quality factor and energy loss of the movement at both atmospheric and low pressures, calculating the energy gain, and modifying the movement by adjusting the gear train reduction ratio, barrel torque, or balance inertia to optimize operation between 0.1 mbar and 200 mbar, allowing for efficient adaptation of mechanical watch movements to low-pressure environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a mechanical watch movement is designed to operate in high vacuum (1/10 to 1/100000 mmHg), then the quality factor of the oscillator increases and energy loss due to air friction decreases, but the movement becomes entirely dependent on vacuum conditions and cannot operate correctly at normal atmospheric pressure
Solution Approach 1:
The patent modifies physical parameters of the movement components (reduction ratio of going train, torque of barrel, inertia of balance) to optimize performance for low-pressure operation while maintaining functionality across different pressure conditions. This allows the movement to adapt to both vacuum and atmospheric pressure environments.
Solution Approach 2:
The patent introduces a dynamic adaptation process where the movement characteristics are adjusted based on operating pressure conditions. By measuring quality factor at different pressures and calculating energy gain, the movement can be optimized for specific pressure environments while retaining operational flexibility.
2Loss of energy
If a mechanical watch movement is designed to operate in a protected low-pressure atmosphere, then energy loss due to friction decreases and quality factor increases, but the design process becomes complex and inefficient
Solution Approach 1:
The patent employs a feedback-based optimization method where the quality factor is measured at atmospheric pressure and at the target low pressure, and the difference is used to calculate the required modifications. This systematic approach simplifies the design process by providing clear guidance on what parameters to adjust and by how much.
Solution Approach 2:
The patent replaces complex trial-and-error mechanical design processes with a calculated optimization approach based on quality factor measurements and energy loss calculations. This substitution of systematic measurement and calculation for iterative mechanical adjustment reduces design complexity and improves efficiency.
3Adaptability or versatility
If the reduction ratio of the going train is increased to compensate for energy loss at atmospheric pressure, then the movement can operate at atmospheric pressure, but the power reserve and running time are reduced
Solution Approach 1:
The patent systematically adjusts the reduction ratio parameter based on measured quality factor differences between pressure conditions. By calculating the exact energy gain at low pressure, the patent determines the optimal reduction ratio modification that maintains power reserve while enabling atmospheric pressure operation.
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
This method enables a 30% increase in power reserve and precision by reducing energy loss, allowing the watch movement to operate efficiently in low-pressure atmospheres with minimal modifications, thus simplifying the adaptation process and maintaining performance.
Implementation Method 1
by reducing the pressure prevailing inside a watch case, the loss of energy due to the friction of the air tends towards zero and therefore the quality factor of the oscillator of the watch movement increases considerably
Implementation Method 2
measure the quality factor FQ of the movement at atmospheric pressure, optically or acoustically, by free oscillation
Data Source
AI summary
The invention relates to a method by which a timepiece movement intended to operate at ambient atmospheric pressure is adapted for operation in a low-pressure atmosphere, comprising the following steps: 1. measuring the quality factor of the movement at atmospheric pressure; 2. measuring the quality factor of the movement at a pre-determined low pressure corresponding to the operating pressure intended for the altered movement; 3. calculating the energy gain between the two measurements; 4. adapting the dimensioning of the movement according to said energy gain, in particular by altering at least one of the following movement elements, namely the reduction ratio of the watch train mechanism, the barrel torque, the overall dimensions of the barrel and the inertia of the balance.