Tufting Machine Yarn Feed Control for Pile Height Variation
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Solution Overview
Problem
Current tufting machines lack the capability to precisely control the placement and pile height of yarns to create complex, multi-pile height patterns with varying colors and textures, limiting the variety and precision of sculptured patterns in tufted articles such as carpets.
Innovation Solution
A tufting machine system with a control system that includes needle bars, shift mechanisms, gauge parts, and a backing support with a resilient spring plate, allowing for precise control of yarn feed and tension to form tufts of varying pile heights and colors, enabling the creation of complex patterns with enhanced selectivity and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional tufting machines are used, then basic tufting function is maintained, but precision control of yarn placement and pile height is insufficient
Solution Approach 1:
The patent implements independent control of yarn feed rate and needle bar transverse position as separate adjustable parameters. The yarn feed mechanism can be controlled to feed yarn at different rates while the needle bar shift mechanism independently adjusts transverse position, allowing precise control of both pile height and lateral placement without requiring complete system redesign
Solution Approach 2:
The patent introduces a yarn feed mechanism as an intermediary component between the yarn source and needle bar. This intermediary device controls the amount of yarn fed to the needle, enabling independent adjustment of yarn length and pile height while the needle bar shift mechanism handles lateral positioning, thus resolving the complexity issue
2Adaptability or versatility
If conventional tufting machines are used, then simple pattern formation is possible, but variety of pattern effects is limited
Solution Approach 1:
The patent implements dynamic control where the yarn feed rate can be continuously adjusted during the tufting process to create varying pile heights within the same pattern. The needle bar transverse position can also be dynamically shifted during operation, allowing the creation of complex sculptured patterns with multiple textures and heights from a single machine configuration
Solution Approach 2:
The patent makes the tufting machine multi-functional by enabling it to produce various pattern effects including different pile heights, sculptured patterns, and textured effects using the same basic machine components. The independent control mechanisms allow a single machine to perform multiple pattern types that previously required different specialized machines
3Adaptability or versatility
If independent control of yarn feed and needle bar position is implemented, then multi-pile height patterns are achieved, but device complexity increases
Solution Approach 1:
The patent segments the control functions into separate independent mechanisms: one mechanism controls yarn feed rate to the needle, while another mechanism controls needle bar transverse position. This segmentation allows each mechanism to be optimized for its specific function without interfering with the other, achieving multi-pile height control while keeping individual mechanism complexity manageable
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
Enables the formation of tufted articles with precise control over pile heights and color placement, achieving desired pattern densities and textures, including multi-color and multi-pile height effects, thereby enhancing the variety and precision of tufted patterns.
Implementation Method 1
at least one spring or biasing portion, such as a resilient spring plate, can be provided to tend to maintain the backing material at an elevated position spaced away from the needle plate by a selected or desired pile height differential
Implementation Method 2
The resilient spring plate will tend to provide a spring or biasing force so as to urge, bias, or otherwise generally resiliently maintain the backing material at a slightly elevated level or position
Implementation Method 3
the yarns fed to selected needles can be controlled so as to tighten or pull the loops of these yarns taut against the gauge parts, sufficient to create a tension force and/or pulling of the yarns taut
Data Source
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Figure 3A
AI summary
A system and method for tufting sculptured and multiple pile height patterned articles, including controlling placement of yarns fed to the needles of the tufting machine by a yarn feed mechanism to form varying patterns includes a backing support over which the backing is fed, and which lifts/and biases the backing to a raised position. As the backing material is fed through the tufting machine, a series of loopers or hooks engage and pick loops of yarns from the needles. The yarn feed mechanism will be controlled to create a tension in selected loops of yarns, to cause the backing material to be pulled against the bias or spring force applied by the backing support toward the needle plate of the tufting machine to create tufts of different pile heights.