Cam-Driven Rake Mechanism for Retrograde Watch Display
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Solution Overview
Problem
Existing watch movement mechanisms combining retrograde and jumping displays often require complex gear trains and multiple parts, leading to increased complexity and reduced aesthetic appeal, while also complicating time setting and correction processes.
Innovation Solution
A watch movement mechanism featuring a cam-driven rake that rotates in the same direction as a retrograde mobile and indicator, eliminating the need for intermediate transmissions and incorporating internal toothing for bidirectional correction, allowing for simplified and rapid correction of the retrograde display without affecting the jumping hour display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex gear trains and multiple parts are used to combine retrograde and jumping displays, then the functionality is achieved, but the device complexity increases and aesthetic appeal decreases
Solution Approach 1:
The patent merges the retrograde display mechanism and jumping display mechanism into a single integrated system. The cam-driven rake simultaneously controls both the retrograde mobile (for retrograde display) and the jumping display ring (for jumping display), eliminating the need for separate gear trains and reducing overall device complexity while maintaining both display functionalities.
Solution Approach 2:
The cam-driven rake serves multiple functions: it drives the retrograde mobile for retrograde time indication, drives the jumping display ring for jumping hour display, and enables bidirectional correction of the retrograde indicator. This multi-functionality reduces the number of components needed and simplifies the overall mechanism.
2Reliability
If intermediate transmissions are used to drive the retrograde mobile, then the motion transmission is achieved, but the number of parts increases and play in the gear train increases
Solution Approach 1:
The patent extracts and eliminates the intermediate transmission components from the mechanism. The cam-driven rake directly drives the retrograde mobile through its opening provided with internal toothing, removing unnecessary intermediate gears and reducing the number of parts while maintaining reliable motion transmission.
3Ease of operation
If traditional correction mechanisms are used, then time setting is achieved, but the correction process is complex and time-consuming
Solution Approach 1:
The patent implements bidirectional correction capability for the retrograde indicator by designing the cam-driven rake system to allow correction in both forward and reverse directions. This dynamic correction mechanism enables rapid time setting by allowing the user to correct the time in the most efficient direction rather than requiring a complete rotation in one direction.
Solution Approach 2:
The patent allows correction of the retrograde indicator in the reverse direction (opposite to the normal rotation direction) by designing the internal toothing and cam interaction to permit bidirectional movement. This inversion of the traditional unidirectional correction approach enables faster time setting by allowing corrections to be made in either direction depending on the time discrepancy.
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
This solution reduces the number of parts and play in the gear train, enhances aesthetic appeal, and facilitates easy and rapid correction of the retrograde indicator, improving handling and simplifying construction while maintaining the functionality of both retrograde and jumping displays.
Implementation Method 1
a cam (5), a rake (3) driven by the cam (5)
Data Source
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AI summary
A mechanism for a watch movement (1) comprises a cam (5), a rack (3) driven by the cam (5), a retrograde wheel (20) that is driven by the rack (5) and supports a retrograde indicator (2) for displaying a first time, the rack (3) and the retrograde wheel (20) being designed to rotate in the same direction. A jumping hour display disk is synchronized with the retrograding movements of the retrograde display.