Countdown Chronograph Striking Mechanism for Pre-Alarm Synchronization
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Solution Overview
Problem
Existing mechanical timepiece movements with countdown mechanisms lack the ability to provide a pre-alarm warning before the end of the countdown and synchronize the striking mechanism with the exact end of the countdown.
Innovation Solution
A mechanical timepiece movement with a chronograph mechanism that includes a striking-mechanism, which starts striking a specified time before the end of the countdown and stops striking at the exact end, using cams and feeler levers to coordinate the countdown display and striking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical timepiece movement includes only a countdown mechanism without a striking mechanism, then the device complexity is reduced, but the ability to provide pre-alarm warning and synchronized end-of-countdown indication is lost
Solution Approach 1:
The patent combines the countdown mechanism and striking mechanism into a single integrated system. The striking mechanism shares the same power source and is controlled by the countdown mechanism's own components (cams and feeler levers), merging two functions into one cohesive unit rather than separate independent mechanisms
Solution Approach 2:
The striking mechanism is configured to activate in advance of the countdown end through a cam profile that triggers the striking sequence at a predetermined point during the countdown. This preliminary action provides the pre-alarm warning function, allowing the user to be notified before the actual countdown completion
2Loss of information
If the striking mechanism starts striking early to provide pre-alarm warning, then the user is warned before countdown end, but the striking must be precisely stopped at countdown end to maintain synchronization
Solution Approach 1:
The mechanism uses a feeler lever that continuously monitors the position of the cam profile throughout the countdown. This feedback system ensures that the striking mechanism activates at the correct moment and stops precisely when the countdown reaches zero, maintaining synchronization between the striking duration and countdown time interval
Solution Approach 2:
The cam profile is designed with dynamic characteristics that vary during rotation - having different radial heights at different angular positions. This dynamic geometry allows the feeler lever to detect specific phases of the countdown (start of striking, end of striking) and automatically control the striking mechanism's activation and deactivation timing
3Device complexity
If the striking mechanism is integrated with the countdown mechanism using shared components, then the device complexity is reduced, but the control precision of striking start and stop timing must be maintained
Solution Approach 1:
The cam profile serves multiple functions simultaneously: it drives the display mechanism, controls the striking activation timing, and determines the striking duration. This multi-functionality reduces the need for separate control components while maintaining precise timing through the single cam's carefully designed geometry
Solution Approach 2:
The mechanism uses its own existing components (the cam and feeler lever already present in the countdown mechanism) to control the striking function. The feeler lever that normally monitors countdown progress is also used to trigger and control the striking mechanism, allowing the system to serve itself without requiring additional external control elements
Data Source
AI summary
A mechanical timepiece movement includes a chronograph mechanism arranged to be capable of carrying out at least one countdown of a predetermined time interval, including a display arranged to display at least the time remaining until the end of the countdown of the predetermined time interval, at least one member for controlling the start of the countdown, and a striking-mechanism. The striking-mechanism is arranged to start striking at a specified time before the end of the countdown and to stop striking at the end of the countdown of the predetermined time interval.