Chronograph Mechanism Automatic Synchronization via Clutch Rocker
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Solution Overview
Problem
Conventional chronograph mechanisms face challenges in precise synchronization between the clutch rocker and blocker, requiring manual adjustment and intervention by specialists, which is time-consuming and prone to errors due to manufacturing tolerances and roundness issues, affecting the proper functioning of the chronograph.
Innovation Solution
A chronograph mechanism where the blocker's movements are directly controlled by the clutch rocker via an eccentric or pin, allowing for automatic synchronization and easy adjustment of the penetration depth of the intermediate wheel into the chronograph wheel, eliminating the need for manual retouching and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment and retouching of parts is performed to achieve synchronization, then synchronization precision is improved, but assembly time and complexity increase
Solution Approach 1:
The clutch rocker is designed to automatically control the blocker's movements through direct mechanical coupling. The rocker's oscillating motion directly actuates the blocker to engage and disengage the chronograph wheel teeth without requiring manual intervention for synchronization adjustment, making the system self-regulating
Solution Approach 2:
The clutch rocker serves multiple functions simultaneously: it controls the intermediate wheel engagement with the chronograph wheel, actuates the blocker for synchronization, and manages the start-stop functions. This multi-functionality eliminates the need for separate adjustment mechanisms for each function
2Measurement precision
If manual retouching and forging of parts is performed, then synchronization accuracy is improved, but manufacturing complexity and skill requirements increase
Solution Approach 1:
The mechanism automatically achieves synchronization through the mechanical coupling between the clutch rocker and blocker. The rocker's motion profile inherently controls the blocker's engagement timing with the chronograph wheel teeth, eliminating the need for specialist intervention or manual retouching
Solution Approach 2:
The design changes the approach from adjusting positional parameters through manual retouching to controlling temporal parameters through the rocker's oscillation frequency and amplitude. The synchronization is achieved by adjusting the rocker's motion characteristics rather than the physical dimensions of contacting surfaces
3Measurement precision
If the blocker is controlled directly by the column wheel or cam, then control precision is improved, but synchronization difficulty increases
Solution Approach 1:
The clutch rocker serves as an intermediary element between the column wheel/cam and the blocker. Instead of direct control, the rocker translates the column wheel's oscillating motion into precise blocker actuation, mediating the control function and simplifying the synchronization mechanism
Solution Approach 2:
The control functions for both the intermediate wheel engagement and the blocker actuation are merged into a single clutch rocker mechanism. This consolidation reduces the number of independent control systems needed and simplifies the overall synchronization complexity
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
Facilitates precise and rapid synchronization of the chronograph mechanism, reducing the need for manual adjustments and specialist intervention, ensuring accurate operation without reworking parts, thereby enhancing the reliability and efficiency of the chronograph's start and stop functions.
Implementation Method 1
the clutch lever carrying the intermediate wheel is pivoted concentrically to a driving wheel in engagement with the intermediate wheel. When the beak, or free end, of the clutch lever is in contact, under the effect of its return spring, with one of the columns of the column wheel or with an upper part of the cam
Implementation Method 2
The degree of penetration of these teeth is determined by the position of an eccentric against which the clutch rocker abuts, the eccentric located between the axis of rotation of the clutch rocker and the beak of this rocker
Data Source
Figure 1
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AI summary
The mechanism has a clutch rocker (3) concentrically pivoted with a driving wheel (2) and carrying an intermediate wheel (4) that is in constant engagement with the driving wheel and engaged in gear teeth of a chronograph wheel (7) along a position of the rocker. A blocker (11) includes a blocking shoe (12) cooperating with the gear teeth, where the blocker and the rocker are subjected to return springs (16, 17). The blocker is supported against a control unit of the rocker under an action of one of the return springs of the blocker.