Leap-Year Display Mechanism for Low-Power Perpetual Calendars
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Solution Overview
Problem
Perpetual calendar display mechanisms in timepieces are complex to produce and consume excessive power, particularly when accounting for leap years.
Innovation Solution
A leap-year display mechanism for a horological movement with a perpetual calendar display, featuring a drive element connected to a month wheel set, a transmission star, and a reduction gear train, which rotates a leap-year display by one step per month, utilizing a simple design with minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a perpetual calendar display mechanism is connected to a display indicating whether the current year is a leap year or a normal year, then the date can be displayed automatically adapting to leap years, but the mechanism becomes complex to produce and assemble
Solution Approach 1:
The mechanism is divided into separate functional modules: a month wheel set rotated by one step per month, a drive element connected to it, a transmission star, and a reduction gear train. This segmentation allows each component to be manufactured and assembled independently, reducing overall production complexity while maintaining automatic leap year adaptation functionality.
Solution Approach 2:
A reduction gear train is introduced as an intermediary mechanism between the monthly drive and the leap-year display. This gear train translates the monthly rotation into the appropriate leap-year cycle rotation, automating the leap year indication without requiring complex electronic or mechanical computing systems.
2Extent of automation
If a perpetual calendar display mechanism is connected to a display indicating whether the current year is a leap year or a normal year, then the date can be displayed automatically adapting to leap years, but the mechanism consumes a lot of power
Solution Approach 1:
The mechanism uses periodic mechanical action through the reduction gear train, which only engages and transmits power when the month wheel set completes a full revolution. This periodic engagement minimizes continuous power consumption compared to electronic systems that would require constant power to maintain the leap year state.
Solution Approach 2:
The patent employs a purely mechanical solution using gears, wheels, and transmission elements instead of electronic or electromechanical systems. This mechanical substitution eliminates the need for power-consuming motors, sensors, or electronic circuits, achieving automatic leap year adaptation with minimal power consumption.
3Use of energy by moving object
If a reduction gear train is used to rotate the leap-year display by one step per month, then power consumption is minimized, but the device complexity increases
Solution Approach 1:
The reduction gear train is integrated with the existing perpetual calendar mechanism components. The gear train shares space and functional relationships with the month wheel set and transmission star, merging multiple functions into a compact arrangement that minimizes overall device complexity despite the added mechanical elements.
Data Source
AI summary
A leap-year display mechanism for a horological movement with a perpetual calendar display including a drive element connected to a month wheel set rotated by one step per month, a transmission star intended to be attached to a structure of the horological movement, arranged along the stroke of the drive element so as to be rotated thereby when the month wheel set completes one full revolution, a leap-year display connected to the transmission star via a reduction gear train so that with each revolution of the month wheel set, the leap-year display is rotated by one step.