Motorized Venetian Blind Cord Synchronization for Light Blocking
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Solution Overview
Problem
Current venetian blinds suffer from light leakage due to asynchronous movements of the lifting pull cord and the ladder cord warps, leading to inconsistent tilting angles between the slats and the bottom rail, which results in inadequate closure and light leakage.
Innovation Solution
A motorized venetian blind system with integrated electric machines and detectors that synchronize the movements of the pull cords and warps, ensuring the slats and bottom rail tilt uniformly, using a combination of lifting and tilting electric machines to adjust the positions of the pull cords and warps, and incorporating detectors to prevent obstruction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower rail is restricted by the maximum released length of the lifting pull cord, then the lifting pull cord cannot fully descend, but this causes the difference in height between the two sides of the lower rail to be insufficient, resulting in light leakage
Solution Approach 1:
The patent introduces a tilting mechanism that allows the lower rail to dynamically change its orientation from horizontal to tilted position. This dynamic adjustment enables the lower rail to compensate for the height difference restriction caused by the lifting pull cord, achieving proper closure with neighboring slats while maintaining operational flexibility through the tilting action
2Object-affected harmful factors
If the tilting angle of the slats is adjusted to achieve closed position, then light shielding is improved, but the lower rail cannot be tilted to the same angle due to weight and center of gravity differences, causing light leakage
Solution Approach 1:
The patent separates the tilting function into two independent segments: the slats tilt through the ladder cord mechanism, while the lower rail tilts through a separate tilting mechanism with its own motor and control system. This segmentation allows each component to be optimized independently, with the lower rail's tilting angle controlled separately to match the slats' closed position, eliminating light leakage without requiring complex synchronized control
3Stability of the object's composition
If the lower rail is made heavier to provide stable support, then structural stability is improved, but the center of gravity becomes inconsistent with the slats, making it difficult to adjust the tilting angle synchronously
Solution Approach 1:
The patent replaces manual or mechanical synchronized tilting with an electric motor-driven tilting mechanism for the lower rail. This substitution allows precise control of the lower rail's tilting angle through electrical control, independent of its weight or center of gravity. The motor can compensate for the weight difference and achieve synchronous tilting with the slats, maintaining stability while simplifying the adjustment operation
Data Source
AI summary
A motorized venetian blind includes a first lifting electric machine, a second lifting electric machine and a tilting electric machine for respectively control a front pull cord, a rear pull cord and a ladder cord. When a front warp and a rear warp of the ladder cord are controlled by the tilting electric machine to move downwardly and upwardly respectively to tilt the slats to the closed position, one of the pull cords on the same side as the upwardly-moving warp is controlled by the first lifting electric machine or the second lifting electric machine to move upwardly along with the upwardly-moving warp. Therefore, the synchronization of the pull cords and the ladder cord is improved, whereby closure between the slats is enhanced, and the bottom rail can be fully tilted to be mostly vertical, partially overlapping the neighboring slat for preventing light leakage.