Digital Printhead Control for High-Speed Textile Patterning
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Solution Overview
Problem
Existing control systems for computer-controlled dye injection in textile patterning struggle to generate and deliver precise actuation instructions at high speeds, especially when producing multi-colored patterns with high definition and complex color blending, often resulting in inadequate or excessive colorant delivery.
Innovation Solution
A control system that uses computer software and hardware to rapidly distribute pattern data to multiple colorant applicators, compensating for the relative positions and motions of the applicators, substrate speed, and colorant requirements, ensuring precise metered quantities of colorant are applied to specific pixels on a moving substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed substrate movement is used to increase productivity, then production rate is improved, but pattern definition precision deteriorates due to inadequate control of colorant delivery timing
Solution Approach 1:
The patent replaces mechanical timing mechanisms with an electronic control system that uses digital signals to precisely control the actuation of colorant applicators. The system incorporates a microprocessor-based controller that receives pattern data and generates precisely timed actuation signals to each applicator, eliminating the timing errors that occur at high substrate speeds with mechanical systems.
Solution Approach 2:
The system incorporates feedback mechanisms where the actual substrate position and speed are continuously monitored and used to adjust the timing of colorant applicator actuation. This closed-loop control ensures that even when substrate speed varies, the colorant is delivered at the precise moment and location required for accurate pattern definition.
2Manufacturing precision
If complex color blending is implemented to improve pattern quality, then manufacturing precision is improved, but device complexity increases due to multiple colorant applicators and control mechanisms
Solution Approach 1:
The control system is designed as a universal platform that can handle multiple colorants and complex blending operations through a single integrated controller. The system uses a standardized interface and control architecture that can accommodate any number of colorant applicators, allowing complex multi-color patterns to be generated without proportionally increasing system complexity.
Solution Approach 2:
The system divides the colorant delivery function into separate, independently controlled applicators, each capable of delivering a specific colorant. This segmentation allows each applicator to be controlled individually according to the pattern requirements, enabling complex color blending while maintaining manageable control through modular architecture.
3Productivity
If rapid distribution of pattern data to multiple applicators is implemented to increase production speed, then productivity is improved, but reliability deteriorates due to potential data synchronization errors
Solution Approach 1:
The system pre-processes and buffers pattern data before distribution to the colorant applicators. The controller receives the complete pattern data, processes it into actuation instructions, and prepares the timing sequences in advance. This preliminary preparation ensures that when data is distributed to multiple applicators during high-speed operation, synchronization is maintained without errors.
Data Source
AI summary
Disclosed herein is an electronic digital control system for printing a pattern onto the surface of a moving substrate in accordance with digitally-defined pattern data using a plurality of individually controllable colorant-dispensing applicators arranged in a series of arrays positioned along the path of said moving substrate, with each array containing a colorant representing a separate process color. The digital control system converts the pattern data, expressed in terms of a color assignment for each individual pattern element comprising the desired pattern, into a series of logical firing instructions for each applicator as required to reproduce the assigned color on the substrate using one or more process colors.