Cam-Driven Instant Display Mechanism for Watchmaking
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Solution Overview
Problem
Existing instantaneous display mechanisms for time indications in watchmaking are prone to breakage due to the risk of immobilization in a singular position during reverse correction, leading to potential damage or failure of the mechanism.
Innovation Solution
The cam design is modified to ensure the finger-cam assembly disengages from the teeth after advancing the display member by one step, preventing immobilization and allowing safe reverse correction without risk of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the finger-cam assembly is designed to engage with the teeth to advance the display member by one step, then the display mechanism achieves instantaneous display function, but the finger may become immobilized in a singular position during reverse correction, leading to breakage risk
Solution Approach 1:
The invention reverses the traditional engagement sequence by designing the cam to first disengage the finger from the teeth before completing the pivoting motion. This inversion of the operational sequence eliminates the singular blocking position that caused breakage during reverse correction, while maintaining the instantaneous display function.
Solution Approach 2:
The cam profile is designed to dynamically control the engagement and disengagement of the finger with the teeth throughout the pivoting motion. By making the engagement state variable rather than fixed, the mechanism can adapt during reverse correction operations, preventing the finger from becoming immobilized in a blocking position.
2Stability of the object's composition
If the cam is designed with a singular position for stable engagement, then the finger-cam assembly maintains stable position, but reverse correction operations may cause the finger to become blocked and break
Solution Approach 1:
The invention inverts the traditional cam design by ensuring disengagement occurs before the end of the pivoting motion rather than after. This reversal eliminates the stable singular position that caused blocking during reverse correction, while maintaining adequate stability through controlled engagement throughout the motion sequence.
3Manufacturing precision
If the finger remains engaged in the toothing during operation, then the display member can be advanced accurately, but rapid correction in the opposite direction causes blocking and potential breakage
Solution Approach 1:
The cam profile dynamically controls the engagement state of the finger with the toothing throughout the operational cycle. During normal advancement, the finger remains engaged for precise positioning, but during reverse correction, the cam timing ensures disengagement occurs before the end of pivoting, preventing blocking while maintaining positioning accuracy.
Solution Approach 2:
The cam is designed to preliminarily disengage the finger from the toothing before the pivoting motion completes. This preliminary action prepares the mechanism for potential reverse correction operations, preventing blocking and breakage while maintaining the precision benefits of engaged operation during normal display advancement.
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 design eliminates the risk of breakage by ensuring the finger cannot become stuck, allowing for safe and reversible operation of the display mechanism, even during opposite direction corrections.
Implementation Method 1
a spring (38) arranged to store and release energy to drive the mobile (18, 39)
Implementation Method 2
a cam (26, 40) arranged to cause the finger-cam assembly to pivot, under the action of spring relaxation
Data Source
Figure 1~2
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Figure 4
AI summary
The mechanism has a display unit (10) provided with a tooth (14) movably mounted in rotation and positioned by a jumper (16). A driving mobile (39) is movably mounted in rotation, and comprises a cam (40) and an inverse cam (24), and a spring (38) indirectly cooperates with the cam. The cam is arranged for pivoting an inverse cam and cam assembly under a relaxation action of the spring in a manner to drive a step of the display unit and to release the inverse cam of the tooth after driving the assembly by the step of the display unit.