Self-winding Watch Activity Tracking via Eccentric Rotor
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Solution Overview
Problem
Mechanical watches lack the capability to track physical activity such as steps taken and time spent active or asleep, which are essential features in modern fitness tracking.
Innovation Solution
Integration of an activity-tracking mechanism within a mechanical watch, utilizing an eccentric rotor and gear system to translate wrist movements into activity tracking, with indicators on the watch face displaying estimated steps and active/sleep time, and a sliding gear assembly to switch between tracking modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical watch includes only traditional timekeeping components (mainspring, gear train, balance wheel, escapement), then the device maintains simplicity and reliability, but it lacks activity tracking functionality
Solution Approach 1:
The patent applies multi-functionality by enabling the mechanical watch to perform both traditional timekeeping and activity tracking functions. The eccentric rotor and gear train are designed to serve dual purposes: winding the mainspring for timekeeping and driving the activity tracking mechanism through the same wrist movements, thus adding versatility without requiring separate independent systems
Solution Approach 2:
The patent merges the activity tracking mechanism with the existing timekeeping components. The eccentric rotor, gear train, and indicator hands are integrated into the watch movement, combining the functions of time measurement and physical activity monitoring into a single unified mechanical system
2Adaptability or versatility
If activity tracking components (rotor, gear train, indicator hands) are added to the mechanical watch, then the watch gains fitness tracking capability, but the device complexity increases
Solution Approach 1:
The gear train serves dual functions: transmitting power from the escapement to drive the timekeeping hands, and simultaneously transmitting power from the eccentric rotor to drive the activity tracking hands. This multi-functionality reduces the need for separate independent mechanisms
Solution Approach 2:
The patent combines the activity tracking indicator system with the existing timekeeping display. Both sets of hands share the same dial and movement structure, merging the visualization of time and activity metrics into a single integrated display interface
3Use of energy by moving object
If the eccentric rotor and gear system are used to track both time and activity, then the mechanism achieves efficient use of wrist movement energy, but the measurement precision for activity metrics may be affected
Solution Approach 1:
The patent segments the gear train into distinct pathways: one gear train portion drives the timekeeping hands with high precision, while another portion drives the activity tracking hands. This segmentation allows each subsystem to be optimized for its specific measurement requirements, maintaining precision despite shared energy source
Solution Approach 2:
Different parts of the gear train are designed with different gear ratios and mechanical characteristics optimized for their specific functions. The timekeeping portion uses high-precision gearing, while the activity tracking portion uses gearing optimized for capturing movement amplitude and frequency, allowing each to maintain appropriate measurement quality
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
Enables a mechanical watch to effectively estimate and display physical activity metrics, providing a modern fitness tracking functionality within a traditional mechanical timepiece.
Implementation Method 1
a self-winding watch includes an eccentric weight, which rotates about a pivot point in response to movements of the user's wrist
Data Source
AI summary
An exemplary mechanical watch has a face including an indicator of current time and one or more indicators of physical activity of a wearer of the mechanical watch. The watch further includes a mainspring to store energy and transfer the energy to a balance wheel and gear train to measure the passage of time, a rotor to rotate about a pivot point in response to movements of a wrist of the wearer of the mechanical watch, a rotor gear coupled to the rotor, and an activity-tracking wheel coupled to one of the one or more indicators of physical activity. Movement of the rotor causes the rotor gear to translate the movement of the rotor into winding of the mainspring and into an indication of physical activity of a wearer of the mechanical watch by causing or controlling rotation of the activity-tracking wheel.