Dual-Mode Camera Inspection for Printing Machine Error Management
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Solution Overview
Problem
Existing inspection systems and error recognition algorithms in printing machines do not effectively enable automatic error management across all phases of error detection, diagnosis, and elimination, relying heavily on operator intervention.
Innovation Solution
An integrated system utilizing a dual-function camera capable of operating as both a line scan and area scan camera, with automatic mode switching and enhanced error recognition algorithms, allows for continuous web inspection and specialized area inspection, supported by an optical spectrometer and digital proof comparison, to automate error management processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a line scan camera is used for high resolution and high readout speed, then measurement precision and productivity are improved, but the system complexity increases due to synchronization requirements with the conveyor movement
Solution Approach 1:
The system uses an encoder to continuously monitor the conveyor position and provides feedback signals to synchronize the line scan camera acquisition with the material web position, ensuring accurate image capture without manual intervention
Solution Approach 2:
The patent replaces manual synchronization operations with an automated encoder-based feedback system that electronically coordinates the camera and conveyor, eliminating the need for mechanical synchronization mechanisms
2Measurement precision
If an area scan camera is used to acquire sections of the print image, then the ability to examine specific areas in high resolution is improved, but the readout speed and productivity decrease compared to line scan cameras
Solution Approach 1:
The system dynamically switches between line scan and area scan camera modes based on the inspection requirements, allowing high-speed continuous monitoring when possible and high-resolution area examination when errors are detected
Solution Approach 2:
The inspection system divides the print image into multiple sections and uses the area scan camera to selectively examine specific sections where errors are suspected, rather than scanning the entire image at high resolution
3Device complexity
If manual error detection and diagnosis is performed by the operator, then the system complexity is reduced, but the productivity and time consumption increase
Solution Approach 1:
The system automatically performs error detection, diagnosis, and machine parameter adjustment without requiring continuous operator intervention, enabling the inspection system to self-correct certain printing errors
Solution Approach 2:
The system implements automated feedback loops where detected errors trigger automatic diagnosis and correction procedures, including real-time adjustment of printing parameters to eliminate errors
4Reliability
If the inspection system features multiple cameras and spectrometers for comprehensive error detection, then the error detection capability is improved, but the device complexity and cost increase
Solution Approach 1:
The system uses a single camera that can operate in multiple modes (line scan and area scan) to perform different inspection functions, reducing the need for multiple specialized devices while maintaining comprehensive error detection capability
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
The system significantly enhances automatic error management by enabling the printing machine to autonomously detect, diagnose, and correct errors, reducing operator intervention and improving overall printing quality and efficiency.
Implementation Method 1
An optical spectrometer breaks the light absorbed by a light point into its spectral components and evaluates the result in a computer system
Implementation Method 2
The grating is located behind the aperture and scatters the spectral components of the incident light at slightly varying angles
Data Source
AI summary
The invention relates to a method for automated error management in a printing machine, in which a recurring print image is imprinted on a moving material web.To improve automated error management for existing inspection systems, a method is provided in which an inspection of the moving material web is controlled by a control unit and a function switch, the function switch being switchable at least between a first function mode and a second function mode, and in which the print image is acquired by a first inspection unit in the first function mode and forwarded to the control unit, and in which the print image is acquired by a second inspection unit in the second function mode and forwarded to the control unit.