Shading Device Pulley Positioning for Cord Identification
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Solution Overview
Problem
Existing shading devices with two operation cords hanging from a headbox face difficulty in distinguishing between the cords, especially when they are twisted or reversed, leading to confusion in operation.
Innovation Solution
The shading device incorporates a first and second driving shaft supported within the headbox, with distinct pulleys positioned differently in the longitudinal direction to drive corresponding moving members, allowing for easy differentiation between the operation cords.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two operation cords are hanging from the headbox in the same position, then the device achieves space saving and reduced complexity, but the cords become indistinguishable when twisted or reversed
Solution Approach 1:
The patent positions the first and second pulleys at different locations in the longitudinal direction of the headbox, transitioning from a single-position arrangement to a multi-position arrangement along the longitudinal axis. This dimensional separation allows operation cords to be hung at distinct locations, making them distinguishable even when twisted or reversed, while still maintaining a compact overall structure.
2Area of stationary object
If a single operation cord position is used, then the device achieves space efficiency, but it becomes difficult to distinguish between vertically hanging cords
Solution Approach 1:
The patent divides the single operation cord position into two separate positions by providing first and second pulleys at different longitudinal locations within the headbox. This segmentation allows each pulley to have its own operation cord, enabling clear identification of cord identities while efficiently utilizing the available space within the headbox structure.
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 configuration enables clear distinction between the two operation cords, enhancing operational clarity and reducing the complexity of the device's components while maintaining space efficiency.
Implementation Method 1
a first pulley (51) that drives the first driving shaft (201a) and a second pulley (52) that is disposed at a position different from the first pulley in a longitudinal direction of the headbox and drives the second driving shaft (201b)
Data Source
AI summary
A shading device including a first driving shaft that is rotatably supported within a headbox and may drive a first moving member and a second driving shaft that is rotatably supported within the headbox and may drive a second moving member, the shading device includes a first pulley that drives the first driving shaft, and a second pulley that is disposed at a position different from the first pulley in a longitudinal direction of the headbox and drives the second driving shaft.