String-Guiding Frame for Curtain Reel Jamming

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Solution Overview

Problem

Conventional curtain-reeling devices experience operational issues due to string oscillation and jamming in the gaps between rollers and frames of the string-guiding wheel assemblies, leading to malfunction and instability in string movement.

Innovation Solution

A string-guiding frame is mounted at the entrance of the string-guiding wheel assembly to limit the string's movement, preventing it from entering the gaps and ensuring smooth operation by guiding the string to wind correctly on the rollers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the string moves rapidly to release or collect the strings, then the productivity of the curtain-reeling device is improved, but the string oscillates and swings violently causing it to jam in the gaps between rollers and frame

Engineering Contradiction:

Improvespeed of string release or collectionVSAvoidstring stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A string-guiding frame is introduced as an intermediary component between the string and the rollers. This frame guides the string's path and limits its movement, preventing violent oscillation and jamming while allowing rapid string release or collection to proceed smoothly

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If gaps are left between the rollers and frame, then the ease of operation is improved by reducing friction and allowing free rotation, but the string may fall into the gaps and jam during rapid reciprocating movement

Engineering Contradiction:

Improveroller rotation smoothnessVSAvoidstring jamming prevention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The string-guiding frame is divided into multiple compartments, each corresponding to a roller. This segmentation allows the string to be guided into specific zones, preventing it from falling into gaps between rollers and frame while maintaining the gaps necessary for free rotation

Inventive Principle:

Principle #1Segmentation

3Reliability

If the string-guiding frame limits the string movement, then the reliability is improved by preventing jamming, but the device complexity increases

Engineering Contradiction:

Improvestring movement stabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The string-guiding frame uses a thin-walled rectangular tube structure that provides effective guidance and limitation of string movement while maintaining simplicity in design and manufacturing. The simple geometric shape minimizes structural complexity

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS8662135B2String-guiding structure for a curtain-reeling device

Publication Date: 2014.03.04 LIN SHIH MING

AI summary

A string-guiding structure for a curtain-reeling device substantially has a string-guiding frame mounted at an entrance of a string-guiding wheel assembly to limit the string extended from the curtain-reeling device inside the string-guiding frame and to be wound on the string-guiding wheel assembly when the string is released or collected. Therefore, the string-guiding frame depresses the oscillation and swing of the string during operation to avoid the string being jammed in the gaps of the string-guiding wheel assembly.