Shiftable Needle Bars for Precise Cut-Loop Tufting Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for forming tufted carpets with precise and varied patterns are costly and limited in design precision, requiring expensive pattern attachments and being constrained by the stagger between needle bars.
Innovation Solution
A tufting machine system with a controller, longitudinally spaced needle bars, and adjustable yarn feed mechanisms that allow for intermixed cut and loop pile tufts in the same longitudinal rows, enabling precise pattern formation without the need for complex yarn feed attachments, using a shift mechanism to control needle alignment and yarn feeding for enhanced precision and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If expensive pattern yarn feed attachments and tube banks are used to achieve precise and varied patterns, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the complex pattern yarn feed attachments and tube banks from the tufting machine system. Instead of using these specialized components, the invention uses standard straight yarn feed mechanisms combined with selectively shiftable needle bars to achieve pattern formation, thereby simplifying the overall device while maintaining precision
Solution Approach 2:
The patent replaces the mechanical pattern yarn feed attachments with a control system that shifts needle bars laterally. The pattern is formed by controlling which needles are active at any given position along the backing material, substituting mechanical complexity with a more manageable needle positioning system
2Device complexity
If standard cut pile, loop pile, and cut/loop pile tufting machines are used, then device complexity is reduced, but manufacturing precision and pattern clarity are limited
Solution Approach 1:
The patent introduces dynamic shifting capability to the needle bars, allowing them to move laterally to different positions. This dynamic positioning enables the same simple machine structure to achieve variable pattern precision by adjusting needle bar alignment with the staggered gauge parts at different locations along the backing material
Solution Approach 2:
The patent divides the needle bar system into multiple independently shiftable bars, each carrying needles that can be selectively positioned. This segmentation allows different sections of the needle bar to be aligned with different gauge part staggers, enabling precise control over where cut and loop pile tufts are formed
Data Source
Figure 1
Figure 2
Figure 3~4B
AI summary
A system and method for forming patterned tufted fabrics such as carpets, including the formation of patterns having cut pile and loop pile tufts therein. The system includes a pair of needle bars (25, 26) each carrying a series of needles (27) to which a plurality of yarns (Y1, Y2) are fed. Cut pile hooks (52) are arranged along a cut pile side of a tufting zone (12, T), in a position to engage the needles (27) of one of the needle bars (25, 26), while loop pile loopers (51) are arranged along the opposite loop pile side of the tufting zone (12, T), in a position to engage the needles (27) of the other one of the needle bars (25, 26). A backing material (B) is fed through the tufting zone (12, T), and as loop pile tufts of yarns (Y1, Y2) are formed in the backing material (B), the needles (27) mounted along a needle bar (25, 26) extending along the cut pile side of the tufting zone (12, T) can be shifted to an off- gauge position, with the yarn feed (35A/B, 36A/B) to these needles (27) further being controlled, to substantially prevent engagement and pick-up of the yarns (Y1, Y2) carried by such needles (27) by the cut pile hooks (52).