Segmented Needle Bar Tufting for Variable Gauge Fabric
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Solution Overview
Problem
Existing tufting machines are limited in creating variable fabric densities and patterns due to constraints in needle bar gauge increments, leading to unattractive longitudinal tuft alignment and streaking from yarn color variations.
Innovation Solution
A backing shifter mechanism that allows independent shifting of the backing fabric relative to the needles, utilizing blocked or segmented needle bars to create variable gauge and novel patterns, reducing backstitch yarn and over-tufting zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional needle bar tufting is used with fixed gauge spacing, then the machine structure is simple and easy to manufacture, but the fabric density is limited and longitudinal tuft alignment creates unattractive patterns
Solution Approach 1:
The needle bar is divided into multiple segments that can independently shift laterally relative to each other. Each segment can be positioned at different lateral offsets, allowing the creation of variable gauge patterns and increased fabric density without requiring a complete redesign of the entire needle bar structure.
Solution Approach 2:
The needle bar segments are made dynamically adjustable during the tufting process. The segments can shift position laterally to create different stitch patterns and density variations, transforming a static structure into a dynamic one that adapts to create diverse fabric effects.
2Manufacturing precision
If lateral shifting of backing fabric is implemented to increase density, then fabric density increases, but backstitch yarn loss and over-tufting increase
Solution Approach 1:
By segmenting the needle bar into independently controllable sections, the lateral shifting is localized to specific areas rather than affecting the entire fabric width. This reduces the amount of backstitch yarn required for shifting and minimizes over-tufting in areas where shifting is not needed.
3Adaptability or versatility
If blocked or segmented needle bars are used to create patterns, then pattern diversity increases, but the control system complexity increases
Solution Approach 1:
The needle bar is segmented into controllable sections that can be independently positioned. Each segment can be controlled to create different patterns, allowing for high pattern diversity while maintaining relatively simple control logic for each individual segment.
Solution Approach 2:
The segmented needle bar system employs periodic lateral shifts of the segments in relation to the fabric feed, creating pattern effects through rhythmic, periodic positioning changes rather than continuous complex control, thereby simplifying the control system.
Data Source
AI summary
A backing feed is utilized with a tufting machine having reciprocating needles and gauge parts for seizing yarns wherein the needles are configured in consecutive gauge positions in alternate segments in front and rear transverse rows of needles, and the position of the needles is shiftable transversely with respect to the backing.