Tufting Needle Bar Non-Repeating Yarn Sequence
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Solution Overview
Problem
Existing tufting methods for creating diverse color patterns in tufted carpet products are limited by the need for increased stitch rates and machine speed reductions with each additional color, leading to slower production, higher costs, and potential backing material integrity issues due to excessive shifting and penetrations.
Innovation Solution
Threading yarns in a non-repeating sequence across the needle bar, allowing the machine to operate as if fewer yarns are being used, thereby reducing shifting and penetration requirements, and maintaining production speed while using a greater variety of colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a repeating pattern of yarn colors is used across the needle bar, then the machine can be operated at a conventional stitch rate, but the production speed decreases and backing material integrity is compromised due to excessive shifting and penetrations
Solution Approach 1:
The patent applies preliminary action by pre-arranging yarns in a non-repeating sequence across the needle bar before tufting begins. This preliminary configuration allows the tufting machine to operate at conventional stitch rates without requiring excessive lateral shifting during operation, thereby maintaining both production speed and backing material integrity simultaneously
Solution Approach 2:
The patent employs asymmetry by using a non-repeating sequence of yarn colors across the needle bar instead of a conventional repeating pattern. This asymmetric arrangement optimizes the distribution of yarn colors across the carpet width, reducing the needle bar's lateral shifting requirements and enabling operation at higher speeds without compromising backing integrity
2Quantity of substance
If the stitch rate is increased to compensate for pulled low or backrobbed yarn loops, then visible yarn quantity increases, but the machine must run slower to maintain production viability
Solution Approach 1:
The patent applies parameter changes by modifying the yarn arrangement parameter from a repeating pattern to a non-repeating sequence. This change allows the system to achieve adequate visible yarn quantity without requiring increased stitch rates that would slow production, thereby resolving the contradiction between yarn visibility and production speed
3Adaptability or versatility
If more different colors are used to form the pattern, then color diversity increases, but the needle bar must shift more and penetrate the backing material more times, slowing production speed
Solution Approach 1:
The patent uses preliminary action by pre-configuring a non-repeating sequence of multiple yarn colors across the needle bar. This preliminary arrangement allows the machine to utilize diverse colors without requiring excessive lateral shifting during operation, enabling high color diversity to be achieved while maintaining commercially viable production speeds
Solution Approach 2:
The patent employs asymmetry through the non-repeating color sequence, which optimizes the spatial distribution of different colors across the carpet width. This asymmetric arrangement reduces the total lateral shifting distance required compared to repeating patterns, allowing greater color diversity without proportionally increasing shift distance and production time
Data Source
AI summary
Methods of tufting a pattern in a backing material using a plurality of different yarns A, B, . . . n that are threaded in the needles of a needle bar in a non-repeating sequence or pattern of yarn sets across the width of the needle bar.