Variably Spaced Tufting Needle Assembly for Web Warping Compensation
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Solution Overview
Problem
In-line tufting machines experience pattern and texture issues due to web warping, causing undesirable offset of tufts and loss of the desired 'in-line' look in tufted articles, particularly noticeable at the edges of the backing material.
Innovation Solution
A tufting needle assembly with a row of back gauge elements and a row of front gauge elements, where each gauge element is spaced at specific distances along their respective longitudinal axes, allowing for independent lateral shifting of needle bars to minimize pattern and texture problems, ensuring a linear tuft implantation and improved surface texture across the backing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If in-line tufting needles are used with uniform spacing, then the tufting machine can produce continuous tufted fabric, but web warping causes pattern and texture problems with offset tufts at the edges
Solution Approach 1:
The patent applies local quality by varying the spacing of tufting needles specifically at the edge portions of the needle bar, while maintaining uniform spacing in the central region. This creates different needle spacing characteristics in different locations along the needle bar, allowing edge areas to be compensated for web warping while preserving the continuous production capability in the central region.
Solution Approach 2:
The patent introduces asymmetry by deliberately creating non-uniform needle spacing at the edges of the needle bar, contrasting with the symmetric uniform spacing typically used throughout. This asymmetric spacing pattern compensates for the asymmetric web warping that occurs at the edges during continuous tufting operations.
2Device complexity
If uniform needle spacing is maintained across the entire needle bar, then the needle bar structure remains simple, but pattern problems become evident particularly at the side edges of the backing material
Solution Approach 1:
The patent modifies the needle spacing arrangement locally at the edge portions of the needle bar while preserving uniform spacing in the central region. This targeted modification improves pattern consistency at the edges without significantly increasing the overall complexity of the needle bar structure.
3Productivity
If the web is fed continuously through the tufting machine, then production efficiency is maintained, but the web warps inwardly at the edges causing loss of in-line appearance
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for the expected web warping through non-uniform needle spacing at the edges. The needle spacing is adjusted in advance to counteract the inward warping that will occur during continuous web feeding, thereby maintaining proper tuft alignment despite the web shape changes.
Data Source
AI summary
A tufting needle assembly for use with a tufting machine is disclosed that comprises at least one gauge block or needle bar having a row of back gauge elements disposed thereon. The respective back gauge elements are spaced from one another a first distance along a back longitudinal axis. The tufting needle assembly further comprises a row of front gauge elements disposed on the at least one gauge block or needle bar and extending along a front longitudinal axis spaced parallel to the back longitudinal axis. At least one gauge element being spaced from one respective adjacent front gauge element at a distance greater than the first distance.