Watch Date Moon Phase Display Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Astronomical and date displays in watches are complex and costly to integrate into existing movements, requiring significant space and component complexity.
Innovation Solution
A simplified mechanism for driving date and moon phase displays using a coaxial hand system with a date ring and moon display wheel set, actuated by a standard date indicator, where drive means ensure a constant angular pitch during rotation, reducing component count and energy peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard date indicator is used to drive moon phase displays, then manufacturing cost and component complexity are reduced, but achieving constant angular pitch during rotation becomes more difficult
Solution Approach 1:
A specialized transmission mechanism acts as an intermediary between the standard date indicator and the moon phase display. This intermediary mechanism converts the variable angular motion from the date indicator into constant angular pitch motion for the moon phase wheel, allowing use of standard components while achieving precise motion control.
Solution Approach 2:
The transmission mechanism dynamically adjusts transmission ratios during the rotation cycle. By changing the effective gear ratio as the date ring rotates, the system compensates for variable angular velocity and maintains constant angular pitch at the output, enabling precise moon phase display despite using a standard date indicator.
2Reliability
If separate drive mechanisms are used for date and moon phase displays, then operational reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the date display and moon phase display drive functions into a single integrated transmission mechanism. Both displays are driven from the same date indicator through a unified gear train, reducing the number of independent mechanisms while maintaining synchronized and reliable operation of both displays.
Solution Approach 2:
The transmission mechanism serves multiple functions simultaneously: it drives both the date display and the moon phase display, provides constant angular pitch to the moon phase wheel, and maintains proper timing relationships between different display elements. This multi-functionality reduces overall system complexity while ensuring reliable operation.
Data Source
AI summary
A date and moon phase display mechanism for watches, including a date ring with an inner toothing arranged to be driven by a timepiece movement, or arranged to cooperate with a date ring with an inner toothing of a timepiece movement, this mechanism including a moon display wheel set held in position by a moon jumper, this mechanism including drive devices, which are actuated by this inner toothing during each rotation of this date ring, and which are arranged to drive this moon display wheel set by a first constant angular pitch during each this rotation of this date ring.