Flying Fusee System Torque Compensation Space Reduction
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Solution Overview
Problem
Fusée systems in watches face challenges such as occupying excessive space and requiring additional bridges due to variations in torque from modern mainsprings, and most rocket mechanisms need intermediate springs to prevent movement stoppage during winding, which also consume space.
Innovation Solution
A 'flying' fusee system with a compact design that eliminates the conventional bridge and uses a differential gear mechanism, including a crown with internal toothing, a ratchet wheel with external toothing, and double pinions, allowing continuous torque supply to the going train during mainspring winding without an intermediate spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fusee system is used to compensate for mainspring torque variations, then torque compensation is achieved, but the space occupied in the movement thickness increases and an additional bridge is required
Solution Approach 1:
The fusee support function is merged with the existing moving part (barrel assembly) by integrating the support axis directly into it. This eliminates the need for a separate bridge structure while maintaining the torque compensation function, thereby reducing space occupation in the movement thickness.
Solution Approach 2:
The moving part serves multiple functions: it houses the mainspring, provides the support axis for the fusee, and transmits torque. This multi-functionality eliminates the need for dedicated bridge structures, reducing overall space requirements while maintaining fusee operation.
2Reliability
If an intermediate mechanism with an intermediate spring is used between the fusee and finishing gear train, then the movement continues during winding, but the space required increases
Solution Approach 1:
The intermediate spring function is merged with the mainspring itself. The mainspring serves dual purposes: providing power to the movement and acting as the intermediate mechanism that maintains torque during winding. This eliminates the need for a separate intermediate spring and reduces space requirements.
Solution Approach 2:
The mainspring performs multiple functions: it stores energy, provides torque compensation through the fusee, and acts as the intermediate mechanism ensuring continuous operation during winding. This multi-functionality eliminates additional components and reduces space occupation.
3Stability of the object's composition
If a conventional bridge structure is used to support the fusee, then stable support is provided, but the device complexity and space requirements increase
Solution Approach 1:
The fusee support function is combined with the existing moving part structure. The support axis is integrated into the barrel assembly, which already provides stable mounting. This eliminates the need for additional bridge structures, reducing device complexity while maintaining support stability.
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
The solution reduces space occupation, allows for uninterrupted clockwork operation during winding, and provides a cleaner upper surface for decoration while offering adjustable torque and power reserve options through varying gear ratios.
Implementation Method 1
The fusee system incorporates a differential gear that allows torque to continue to be supplied to the clockwork movement while the mainspring is being wound
Implementation Method 2
a ratchet wheel with external teeth, the ratchet wheel being intended to be driven during the winding of the timepiece and preferably being positioned by a locking pawl
Implementation Method 3
a crown wheel with internal teeth and a ratchet wheel with external teeth... a spindle wheel, intended to drive the finishing gear train of a timepiece movement
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a fusee system (1) for a timepiece including: a supporting pin (13); a fusee (5) pivoted about said supporting pin (13) and suitable for receiving a chain (3) around the perimeter of said fusee (5). According to the invention, the supporting pin (13) is intended for being secured by a first end to a case element of said timepiece.