Operation Stabilization Mechanism for Mechanical Timepiece Balance Wheel
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Solution Overview
Problem
Mechanical timepieces with constant-force devices experience unstable balance wheel rotation due to intermittent motion of the carriage, leading to fluctuations in oscillation cycles under gravitational influence.
Innovation Solution
An operation stabilization mechanism with a first and second carriage, where a constant-force spring drives the second carriage, and an escapement/governor mechanism is mounted on the second carriage to smooth rotational operation, reducing power loss and stabilizing the balance wheel's oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a constant-force device with a rotating carriage is used to drive the escape wheel, then the rotational torque is stabilized, but the carriage produces intermittent motion that shocks the balance wheel and destabilizes oscillation
Solution Approach 1:
The patent divides the carriage system into two independent carriages: a first carriage that rotates continuously to drive the escape wheel, and a second carriage that carries the balance wheel and rotates intermittently to regulate power release. This segmentation allows the drive function and regulation function to be separated, eliminating the shock transmission to the balance wheel while maintaining constant torque.
Solution Approach 2:
The first carriage acts as an intermediary between the power source and the second carriage. It receives continuous rotational motion from the mainspring and transfers it to the second carriage through a controlled mechanism, smoothing out the intermittent motion and preventing shocks from reaching the balance wheel directly.
2Duration of action of moving object
If the carriage rotates intermittently to release power, then the constant-force spring is wound up periodically, but the intermittent motion applies shock to the balance wheel
Solution Approach 1:
The patent separates the power release function (performed by the first carriage rotating continuously) from the regulation function (performed by the second carriage rotating intermittently). This allows the balance wheel to be isolated from the intermittent motion shocks while the power release cycle is maintained through the first carriage's continuous rotation.
Solution Approach 2:
The first carriage rotates continuously beforehand to accumulate and smooth the rotational motion before transferring it to the second carriage. This continuous rotation acts as a cushion that absorbs and distributes the intermittent motion, preventing shocks from reaching the balance wheel during the power release cycle.
3Device complexity
If the escape wheel & pinion is directly driven by the constant-force spring, then the mechanism is simple, but the balance wheel oscillation becomes unstable under gravitational influence
Solution Approach 1:
The patent introduces a two-carriage system that segments the drive and regulation functions. The first carriage handles the drive function with continuous rotation, while the second carriage handles the regulation function with intermittent rotation. This segmentation adds structural complexity but significantly improves oscillation stability by isolating the balance wheel from disruptive intermittent motions.
Solution Approach 2:
The patent implements dynamic motion characteristics by having the first carriage rotate continuously while the second carriage rotates intermittently. This dynamic differentiation allows the system to adapt to gravitational influences on the balance wheel, maintaining stable oscillation cycles despite the added mechanical complexity.
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 mechanism stabilizes the balance wheel's operation, preventing oscillation cycle changes due to gravitational direction, while efficiently driving the escapement mechanism and reducing power loss.
Implementation Method 1
a constant-force spring provided between the first carriage and the second carriage and imparting a rotational force to the second carriage so that the second carriage may rotate with respect to the first carriage
Implementation Method 2
an escapement/governor mechanism mounted in the second carriage and configured to be driven through rotation of the second carriage
Data Source
AI summary
An operation stabilization mechanism has a first carriage to which a rotational drive force of a train wheel is transmitted and which is rotatably supported with respect to a main plate, and a second carriage rotatably supported with respect to the first carriage. A constant-force spring is provided between the first carriage and the second carriage and is configured to impart a rotational force to the second carriage so that the second carriage undergoes rotation with respect to the first carriage. An escapement/governor mechanism is mounted in the second carriage and is configured to be driven by a rotational torque generated through rotation of the second carriage and transmitted to the escapement/governor mechanism. A stopper lever is mounted to undergo rotational movement relative to the first carriage for suppressing fluctuations in the rotational torque transmitted to the escapement/governor mechanism.