Flexible Coupling Timepiece Wheel Etching

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Solution Overview

Problem

Existing methods for manufacturing timepiece wheels using silicon wafers face challenges when applying tie bars between teeth with small intervals, leading to difficulties in meshing and potential damage during cutting.

Innovation Solution

The method involves etching a plate-shaped member made of brittle material to form a wheel with a flexible coupling portion that connects to the leading end of each tooth, allowing for easier integration and reducing the risk of damage during cutting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the tie bar is coupled between the teeth of the wheel, then the wheel can be manufactured using the existing method, but it becomes difficult to apply the method to wheels with small intervals between teeth

Engineering Contradiction:

Improveease of manufactureVSAvoidadaptability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The coupling portion is segmented from the wheel body through a cut, creating a separate flexible coupling element that connects the frame to the tooth. This segmentation allows the coupling portion to be independently designed with flexibility characteristics that are not constrained by the wheel's tooth interval, enabling application to wheels with small intervals between teeth.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The coupling portion acts as an intermediary element between the frame and the tooth, providing a flexible connection that mediates the mechanical coupling. This intermediary structure allows the wheel to be manufactured using existing etching methods while adapting to various tooth configurations including small intervals.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the tie bar is coupled between the teeth, then the wheel structure is simplified, but when the tie bar cut portion projects, the wheel may not be able to normally mesh with another wheel

Engineering Contradiction:

Improvedevice complexityVSAvoidmeshing reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Instead of coupling the tie bar between the teeth (internal coupling), the invention couples the coupling portion to the leading end portion of the tooth (external coupling). This inversion of the coupling location eliminates the projection problem that would interfere with meshing, while still achieving the desired flexible connection between the frame and wheel.

Inventive Principle:

Principle #13The other way round (Inversion)

3Strength

If a rigid tie bar is used to couple the frame to the wheel, then structural strength is improved, but the cutting process may cause damage to the wheel

Engineering Contradiction:

Improvestructural strengthVSAvoiddamage during cutting

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The coupling portion is designed as a flexible element rather than a rigid tie bar. This flexibility allows the coupling portion to deform during the cutting process, absorbing mechanical stresses that would otherwise be transmitted to the wheel and cause damage. The flexible coupling maintains structural integrity while protecting the wheel during manufacturing.

Inventive Principle:

Principle #30Flexible shells and thin films

4Stability of the object's composition

If the coupling portion is made rigid to ensure stable operation, then operational stability is improved, but it becomes difficult to cut without damaging the wheel

Engineering Contradiction:

Improveoperational stabilityVSAvoidease of cutting

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The coupling portion is designed with specific dimensional parameters that provide flexibility during cutting while maintaining operational stability. By carefully controlling the thickness, length, and cross-section of the coupling portion, it achieves optimal balance between cuttability and operational rigidity, allowing easy cutting without damage while ensuring stable wheel operation.

Inventive Principle:

Principle #35Parameter changes

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 approach enables the manufacturing of timepiece wheels with small tooth intervals, ensuring proper meshing and minimizing damage during the cutting process, while also allowing for flexible coupling that aids in stable operation.

Implementation Method 1

performing etching on a plate-shaped member made of a brittle material to form a wheel for a timepiece

Methodology Applied

Scientific EffectEtching:

Data Source

PatentUS20240427289A1Method Of Manufacturing Wheel For Timepiece, Plate-Shaped Member, Wheel For Timepiece, And Timepiece

Publication Date: 2024.12.26 SEIKO EPSON CORP

AI summary

A method of manufacturing a wheel includes an outer shape formation process in which etching is performed on a silicon wafer made of a brittle material to form the wheel including a plurality of teeth, a frame portion that is disposed outside the wheel, and a coupling portion that is more flexible than the teeth and couples the frame portion to a leading end portion of a corresponding one of the teeth, and a cutting process in which the coupling portion and the wheel are cut.