Rotating Arm Machine for Wrinkle-Free Cellular Structures
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Solution Overview
Problem
Existing methods for producing cellular window coverings result in significant material waste due to curvature issues and inefficiencies in processing, leading to high scrap rates and unsightly wrinkles in the finished product.
Innovation Solution
A machine that winds tubular material onto a collector with a slow-cure adhesive, allowing the cellular structure to be cut to desired dimensions and flattened on a surface, reducing curvature and enabling efficient production of wrinkle-free cellular structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If material is stacked on the curved ends of the rotating arm, then production capacity is maintained, but the cellular material retains curvature that causes noticeable wrinkles in the finished product
Solution Approach 1:
The rotating arm is divided into two functional zones: curved ends for stacking (maintaining production capacity) and flat surfaces for final product formation (ensuring flatness). This segmentation allows material to be accumulated on curved sections while only the flat-section material is used for window coverings, eliminating wrinkles while maintaining productivity.
2Manufacturing precision
If stacks are cut to provide panels equal to the size of the shade, then proper dimensions are achieved, but 20-25% of each stack becomes excess material that is scrapped
Solution Approach 1:
The flat surfaces of the rotating arm are designed with dimensions that pre-calculate the optimal panel size needed for standard window coverings. Material is deposited only on these precisely dimensioned flat surfaces, so when cuts are made, the panels are already the correct size for the shades, minimizing or eliminating the need to discard excess material.
3Productivity
If the height of stacks is limited by the distance between the ends of the arm and the factory floor, then material can be stacked, but the stack height and thus production efficiency are constrained
Solution Approach 1:
Instead of increasing stack height vertically (constrained by floor distance), the invention utilizes the horizontal dimension by providing multiple flat surfaces on the rotating arm. This allows material to be distributed across several surfaces simultaneously, effectively increasing total stacking capacity without increasing the vertical height limitation.
4Manufacturing precision
If 15-20% of starting material from curved ends is scrapped to eliminate curvature, then product quality is maintained, but overall material efficiency decreases
Solution Approach 1:
Different regions of the rotating arm are assigned different functions: curved ends are dedicated solely to material accumulation and transfer (where curvature is acceptable), while flat surfaces are dedicated to final product formation (where flatness is critical). This local specialization ensures that only the necessary minimum material is used for flat surfaces, dramatically reducing scrap rates while maintaining product quality.
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
Significantly reduces material waste and produces wrinkle-free cellular structures that can be cut to specific dimensions, improving the efficiency and quality of window covering production.
Implementation Method 1
At least one longitudinal line of adhesive, preferably a slow cure adhesive, is applied to the exterior surface of the elongated tubular material before that material is placed on the wheel
Implementation Method 2
If the adhesive cures while the stack is on a flat surface any initial curvature in the stack will decrease as gravity causes the stack to flatten
Data Source
AI summary
A machine for making collapsible cellular structures folds two fabric webs into a V-shape or C-shape, connects the webs together with strands of adhesive, applies glue lines and collects the webs on a wheel. A variable speed motor, a fabric drive system which enables glue to be applied when the fabric is not stretched and a lay-on wheel assembly with movable arm that directs the fabric onto the collector can be provided in the machine.