Tufting Machine Yarn Feed Control for Uniform Consumption
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Solution Overview
Problem
Tufting machines consume yarn at different rates when producing patterned tufted carpets, leading to waste and complexity in the manufacturing process due to varying yarn heights.
Innovation Solution
A control system for tufting machines that includes a system controller communicating with yarn feed controllers to manage yarn feed lengths, allowing for programmable yarn feed profiles to ensure consistent yarn consumption across different stitches and pattern repeats, thereby maintaining uniform yarn feed length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If yarn is fed at varying lengths to create different tuft heights for patterns, then pattern appearance is improved, but yarn consumption becomes inconsistent and complex
Solution Approach 1:
The patent divides the yarn feed control into multiple independent yarn feed controllers, each managing a specific yarn source. Each controller can be independently programmed with different feed profiles, allowing complex pattern creation while maintaining independent control over each yarn's consumption. This segmentation resolves the contradiction by enabling pattern complexity without requiring the entire system to manage varying feed lengths centrally.
Solution Approach 2:
The system uses programmable yarn feed profiles that define specific feed length parameters for different stitches and pattern repeats. By changing the feed length parameter systematically according to pre-programmed profiles, the system achieves varied tuft heights for patterns while maintaining consistent overall yarn consumption through automated parameter management.
2Shape
If different feed lengths are used for different stitches in a pattern, then tuft height variation is achieved, but yarn waste increases
Solution Approach 1:
The system incorporates feedback mechanisms where the controller monitors yarn feed consumption and adjusts subsequent feed lengths to compensate for variations. The programmable profiles are designed to balance yarn usage across different stitches, ensuring that while individual tuft heights vary, the total yarn consumption per pattern repeat remains consistent, thereby reducing yarn waste.
Solution Approach 2:
The patent implements periodic action by programming yarn feed profiles that repeat consistently for each pattern repeat. This periodic feeding pattern ensures that yarn consumption is synchronized with the production cycle, allowing varied tuft heights within each period while maintaining consistent overall consumption rates across multiple periods.
3Manufacturing precision
If multiple yarn feed profiles are programmed for different stitches, then pattern precision is improved, but control system complexity increases
Solution Approach 1:
The control system achieves universality by using a single programmable controller architecture that can manage multiple yarn feed profiles and switch between them based on pattern requirements. Each yarn feed controller is multi-functional, capable of executing different feed profiles for different stitches while maintaining a unified control interface, thus improving pattern precision without proportionally increasing overall system complexity.
4Adaptability or versatility
If yarn consumption is allowed to vary for pattern creation, then design flexibility is improved, but manufacturing process complexity increases
Solution Approach 1:
The system applies preliminary action by pre-programming yarn feed profiles that define the exact feed length variations needed for different pattern designs. This allows design flexibility to be achieved through software configuration rather than hardware modifications, maintaining manufacturing simplicity while enabling versatile pattern creation. The profiles are prepared in advance and automatically executed during production.
Data Source
AI summary
The invention relates to a control system for a tufting machine configured for forming tufted carpet. The tufting machine can have a system controller in communication with the tufting machine and with a plurality of yarn feed controllers for controlling operation of yarn feed motors that are configured to supply yarn from a source of yarn to the tufting machine. The system controller is programmable to enable input of a plurality of predetermined yarn feed profiles for selected stitches of a programmed pattern to be tufted such that, although at least two of the predetermined yarn feed profiles can be different, substantially the same feed length of yarn is used from each of the plurality of yarns.