Display Apparatus Date Wheel Rotation Mechanism
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Solution Overview
Problem
Existing display apparatus for electronic watches are complex and prone to malfunctions due to the need for multiple components to detect the 31st day in months with fewer days, complicating assembly and operation.
Innovation Solution
A simplified display apparatus with a first and second display wheel, where the first display wheel rotates independently in the forward direction and together with the second display wheel in the reverse direction, using a rotating section with clutch teeth and a brake member to manage date changes without the need for a restricting lever and conductive pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a restricting lever, conductive pin, and switch spring are used to detect the 31st day, then the 31st day detection function is achieved, but the device complexity increases and assembly becomes difficult
Solution Approach 1:
The patent merges the detection function into the existing month wheel structure by forming protrusions directly on the month wheel at positions corresponding to months with 31 days. This eliminates the need for separate restricting levers, conductive pins, and switch springs, as the month wheel itself performs both display and detection functions through its protrusion configuration.
Solution Approach 2:
The month wheel is given multiple functions: it displays month information through its scale markings and simultaneously detects the 31st day condition through its protrusions. This multi-functional design removes the need for dedicated detection components, simplifying the overall structure while maintaining detection reliability.
2Reliability
If multiple components are used for date detection, then detection function is achieved, but assembly and operation reliability decreases due to more potential failure points
Solution Approach 1:
By combining the detection function into the month wheel structure itself, the patent reduces the number of independent components that can fail. The protrusions on the month wheel work directly with the date wheel's recesses to detect the 31st day condition, eliminating multiple potential failure points associated with separate levers, pins, and springs.
3Reliability
If a restricting lever and switch spring mechanism is used, then the 31st day is detected, but the structure becomes complicated and prone to malfunctions
Solution Approach 1:
The patent extracts and eliminates the complex restricting lever and switch spring mechanism by incorporating the detection function directly into the month wheel. The protrusions on the month wheel directly engage with recesses on the date wheel to detect the 31st day condition, removing unnecessary intermediate components and simplifying the overall structure.
Solution Approach 2:
The detection function is merged into the month wheel structure itself. The protrusions formed on the month wheel at positions corresponding to 31-day months directly interact with the date wheel, combining the month display and detection functions into a single component system.
Data Source
AI summary
A display apparatus which includes: a first display wheel that has a first display section; a second display wheel that has a second display section; a driving section that rotates in a forward direction and a reverse direction, and rotates the first display wheel in the forward direction and the reverse direction; and a rotating section that rotates only the first display wheel in the forward direction when the first display wheel is rotated in the forward direction, and rotates the second display wheel in the reverse direction together with the first display wheel when the first display wheel is rotated in the reverse direction.