Arc Guiding Frame for Curtain String Reeling
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Solution Overview
Problem
Conventional automatic curtain-reeling devices experience string entanglement and malfunction due to rapid movement and rebound, causing strings to get caught in gears or fall into seams between the device and the top rail.
Innovation Solution
A string-guiding structure with an arc guiding frame and pivotal holes defines a limiting space to prevent string entanglement, using a connecting pin and arc guiding frame to control string movement and reduce swing and rebound, and incorporating sleeves for smoother contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the diameters of the guiding wheels are made small to achieve compact structure, then the rotation speed increases and string collection is faster, but the strings swing rapidly and easily get caught in gear gaps or fall into seams causing malfunction
Solution Approach 1:
An arc-shaped guiding frame is introduced as an intermediary component between the string and the guiding wheels. This guiding frame has a specific arc radius that matches the string path, guiding the string smoothly through the reeling device. The guiding frame acts as a mediator that controls string movement trajectory, preventing the string from swinging into gear gaps or falling into seams, thus resolving the contradiction between fast collection speed and device reliability
Solution Approach 2:
The guiding frame is designed with a specific arc curvature that matches the rotational path of the guiding wheels. This curved geometry ensures the string follows a smooth circular path during reeling, preventing lateral swinging and vertical drooping. The arc-shaped guide converts the problematic linear string movement into a controlled curved trajectory, eliminating the Harmful effects of string entanglement while maintaining high rotation speed
2Adaptability or versatility
If the strings are mounted at different locations on the guiding wheels to enable pulling and stopping at any position, then operational flexibility is improved, but the strings swing violently during rebound causing them to enter gear gaps or fall into seams
Solution Approach 1:
The arc-shaped guiding frame serves as a mediator that intercepts and controls the string's rebound motion. When the string rebounds from different mounting positions, the guiding frame's curved surface redirects the string along a controlled path, preventing it from swinging into harmful areas. The guiding frame absorbs and redirects the rebound energy, converting violent swinging into controlled motion along the arc path
Solution Approach 2:
The curved geometry of the guiding frame provides a natural path for the string during both outward pulling and inward collection. The arc radius is specifically designed to accommodate strings mounted at various positions on the guiding wheels, ensuring that regardless of mounting location, the string follows a smooth curved trajectory rather than swinging violently. This curvature-based guidance eliminates the harmful swinging effect while preserving positioning flexibility
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 ensures smooth string release and collection, preventing entanglement with gears and seams, enhancing operational stability and reliability of the automatic curtain-reeling device.
Implementation Method 1
the arc guiding frame rotated to lean against the connecting pin to define a limiting space for penetration of the string
Implementation Method 2
incorporating sleeves for smoother contact
Data Source
AI summary
A string-guiding structure for an automatic curtain-reeling device has an arc guiding frame pivotally attached at an entrance for a string corresponding to a connecting pin to extend the string via a limiting space defined between the arc guiding frame and the connecting pin. Therefore, the string is trimmed and depressed to avoid being seized caused by over-rebound or swing of the string and to make the string to work smoothly.