Can Decorator Feedback Control for Image Registration Stability
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Solution Overview
Problem
High-speed can decorators face issues with image registration errors, ink temperature instability, and ink application inconsistencies, leading to high spoilage rates and operating costs due to frequent shutdowns and inefficient ink usage.
Innovation Solution
A control system with a can inspection system, controller, and adjustment assemblies using stepper motors to adjust plate cylinder positions and ink temperature for precise image registration and optimal ink application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed continuous motion machines are used for can decoration, then productivity is improved, but image registration errors and ink application inconsistencies increase
Solution Approach 1:
The patent implements a feedback control system that uses cameras to capture images of decorated cans and compares them against reference images. The controller analyzes the captured images to determine image quality and registration accuracy, then feeds this information back to adjust the plate cylinder positions and ink temperature control elements, creating a closed-loop system that maintains precision at high speeds
Solution Approach 2:
The patent replaces manual mechanical adjustment of plate cylinders with an automated control system that uses stepper motors driven by digital signals from the controller. This substitution of mechanical adjustment with electronically controlled actuation enables more precise and consistent positioning at high speeds
2Device complexity
If ink temperature is not controlled, then device complexity is reduced, but ink application consistency and image quality deteriorate
Solution Approach 1:
The patent changes the temperature parameter of the ink by using temperature control elements (heating or cooling devices) that adjust the ink temperature within the ink fountain. This parameter change enables consistent ink application and improved image quality while maintaining reasonable device complexity through automated control
3Device complexity
If plate cylinder position is not adjusted, then device complexity is reduced, but image registration errors increase
Solution Approach 1:
The patent makes the plate cylinder position adjustable and dynamic rather than fixed. The plate cylinders can be positioned at different circumferential and translational locations based on real-time image analysis, allowing the system to adapt to variations and maintain precise image registration without requiring complex permanent adjustment mechanisms
Solution Approach 2:
The patent replaces manual mechanical positioning with an automated system using stepper motors controlled by digital signals from the controller. This enables precise, repeatable, and easily adjustable plate cylinder positions through electronic control rather than complex mechanical linkages
4Manufacturing precision
If shutdowns are used to correct image quality issues, then manufacturing precision is improved, but productivity and loss of time increase
Solution Approach 1:
The feedback control system continuously monitors image quality and automatically adjusts parameters during operation, eliminating the need for shutdowns to correct issues. The system can make real-time corrections to plate cylinder position and ink temperature without interrupting the decoration process
Solution Approach 2:
The patent enables continuous operation by automatically correcting image quality issues during the decoration process rather than requiring interruptions. The control system maintains continuous adjustment of plate cylinder positions and ink temperature to ensure consistent quality throughout the production run
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
Improves image quality, reduces maintenance and downtime, and enhances efficiency by correcting alignment and temperature control in can decorators.
Implementation Method 1
a can inspection system structured to capture images of a can
Implementation Method 2
the adjustment assembly including at least one stepper motor, wherein operation of the at least one stepper motor causes the circumferential or translational adjustment
Data Source
AI summary
A control system for a can decorator structured to apply images to cans includes a can inspection system structured to capture images of a can, a controller structured to receive the captured images and to analyze the captured images to determine a quality of the image applied to the can based on a comparison of the captured images and a reference image, and an adjustment assembly structured to adjust a circumferential or translational position of a plate cylinder attached to a plate cylinder shaft end of a plate cylinder shaft, the adjustment assembly including at least one stepper motor, wherein operation of the at least one stepper motor causes the circumferential or translational adjustment.