Rotary Beel Spring Mechanism for Position Stability
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Solution Overview
Problem
In timepieces with rotary bezels, unintended rotation can lead to an inappropriate relationship between indication hands and indices, resulting in incorrect information retrieval.
Innovation Solution
A timepiece design featuring a rotatable annular bezel with a spring member that includes urging, clicking, and locking pieces to control bezel rotation, ensuring it remains locked when not operated and allows rotation with a clicking sensation when operated, using separate engagement sections to simplify bezel body manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple rotary bezel structure is used, then ease of manufacture is improved, but the bezel may rotate unintentionally causing incorrect information display
Solution Approach 1:
The spring member is divided into functionally distinct segments: an urging piece for applying rotational force, a clicking piece for engagement with clicking grooves, and a locking piece for engagement with locking grooves. This segmentation allows each component to perform its specific function independently, achieving reliable bezel positioning without requiring a completely complex structure.
Solution Approach 2:
The single spring member performs multiple functions simultaneously: it provides urging force for rotation, enables clicking engagement for user feedback, and provides locking engagement for position maintenance. This multi-functionality reduces the need for separate components, maintaining manufacturing simplicity while ensuring reliability.
2Reliability
If a locking mechanism is added to prevent bezel rotation, then reliability is improved, but device complexity increases
Solution Approach 1:
The urging piece, clicking piece, and locking piece are merged into a single integrated spring member. This combining approach allows the locking mechanism to be implemented without adding separate complex components, as the locking piece works in conjunction with the existing clicking groove structure to provide reliable bezel positioning.
3Reliability
If the bezel is always locked to prevent rotation, then information accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is made dynamic through the interaction between the spring member and the bezel. The locking piece engages with locking grooves to maintain position accuracy when the bezel is stationary, but disengages when rotational force is applied, allowing smooth operation. This dynamic behavior is achieved through the elastic properties of the spring member and the geometric arrangement of engagement features.
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 design reliably prevents bezel rotation when not in use, maintains displayed content accuracy, and enhances operability with a clicking mechanism, while simplifying bezel body manufacturing and allowing easy part handling and assembly.
Implementation Method 1
an urging piece that urges the rotary bezel toward a timepiece front side
Implementation Method 2
a clicking piece that engages with and disengages from any of the clicking engagement sections when the rotary bezel is rotated
Implementation Method 3
a locking piece that engages with any of the locking engagements section when the rotary bezel is moved toward the timepiece front side to prevent the rotary bezel from rotating
Data Source
AI summary
A timepiece with a rotary bezel includes a rotary bezel attached to a case body so as to be rotatable relative thereto and a spring member disposed between the case body and the rotary bezel. The rotary bezel includes clicking engagement sections and locking engagement sections provided along the direction in which the rotary bezel is rotated and is configured to be movable relative to the case body in a timepiece thickness direction, and the spring member includes an urging piece that urges the rotary bezel toward a timepiece front side.