Two-Stage Column Wheel for Single Push-Button Chronograph
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Solution Overview
Problem
Current column-wheel chronograph mechanisms are predominantly two-stroke, requiring two push-buttons for start/stop and reset functions, making the design of a three-stroke mechanism with a single push-button complex due to the need for specific kinematic changes and column shapes.
Innovation Solution
A chronograph mechanism featuring a two-stage column wheel, where successive presses on a single push button control the start, stop, and reset functions, with the first and second stages of columns cooperating with the clutch and reset devices respectively, allowing for minimal changes from existing two-stroke mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a three-stroke chronograph mechanism is designed with a single push-button, then the ease of operation is improved, but the device complexity increases due to the need for specific kinematic changes and column shapes
Solution Approach 1:
The column wheel is segmented into two distinct stages: a first stage with columns that have a first shape for controlling the clutch device, and a second stage with columns that have a second shape for controlling the reset device. This segmentation allows each stage to be optimized for its specific function while maintaining a unified single-push-button operation, thereby improving ease of operation without excessive complexity increase
Solution Approach 2:
Different columns at different stages of the column wheel are given different local qualities (shapes). The first stage columns have a first shape configured to interact with the clutch device, while the second stage columns have a second shape configured to interact with the reset device. This local differentiation enables the single push-button to control multiple functions through context-dependent column interactions, resolving the contradiction between operational simplicity and mechanical complexity
2Adaptability or versatility
If a three-stroke mechanism is created with specific column shapes and kinematic changes, then the functionality is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The column wheel is divided into two manufacturable stages with distinct column shapes. The first stage columns are designed with a first shape suitable for clutch control, while the second stage columns are designed with a second shape suitable for reset control. This segmentation into standardized stages makes the complex three-stroke mechanism easier to manufacture by reusing proven design patterns from two-stroke mechanisms while adding only the necessary second stage
Solution Approach 2:
The column wheel structure is designed to be universal, where the same basic column wheel architecture can serve both two-stroke and three-stroke chronograph functions. By adding a second stage to an existing first stage design, the mechanism gains enhanced functionality (three-stroke operation) while maintaining ease of manufacture through component standardization and modular design
Data Source
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AI summary
A chronograph mechanism comprising a chronograph wheel (33), a clutch device (32) for coupling the chronograph wheel (33) with a drive train (37), a reset device (34), a column wheel (31) for controlling the clutch device (32) and the reset device (34), and a push button (30) arranged to actuate the column wheel (31) such that successive presses of the push button (30) control the start, stop, and reset of the chronograph mechanism. This mechanism is characterized in that the column wheel (31) comprises a first stage of columns (69) cooperating with the clutch device (32), and a second stage of columns (70) cooperating with the reset device (34).