Overprinting Registration Control With Adaptive Image Capture
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Solution Overview
Problem
Existing digital printing systems face challenges in ensuring both adjustment precision and working efficiency due to the inability to accurately and quickly detect and adjust for overprinting deviations caused by nozzle displacement and paper vibration, leading to reduced printing quality.
Innovation Solution
An automatic registration control system with image capture modules and a control module that adjusts the time paper stays under each nozzle based on color differences and lighting power to optimize capturing and adjustment precision while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the camera uses short-time capturing recognition to maintain working efficiency, then the printing speed is improved, but the recognition precision deteriorates when color differences are small
Solution Approach 1:
The patent applies dynamics by making the exposure time of the camera adjustable and adaptive. The control module dynamically adjusts the exposure time based on the calculated color difference between adjacent nozzles. When color difference is small (potentially problematic cases), the exposure time is extended to improve recognition precision. When color difference is large (clear cases), the exposure time is kept short to maintain printing speed. This dynamic adjustment resolves the contradiction between speed and precision.
Solution Approach 2:
The patent changes the parameter of exposure time based on color difference calculations. The control module compares colors of adjacent nozzles and adjusts the camera's exposure time parameter accordingly. This parameter change allows the system to optimize recognition precision for subtle color differences while maintaining efficient printing for obvious color differences, effectively resolving the technical contradiction.
2Measurement precision
If the camera uses long-time multi-exposure recognition capturing to improve recognition precision, then the color difference detection is improved, but the printing efficiency deteriorates
Solution Approach 1:
The patent changes the exposure time parameter dynamically based on the actual color difference between adjacent nozzles. Instead of using fixed long-time multi-exposure capturing for all cases, the system calculates color differences first and then adjusts exposure time accordingly. This selective parameter adjustment achieves high precision only when necessary, maintaining printing efficiency for cases where precision requirements are lower.
Solution Approach 2:
The system transitions from static long-time capturing to dynamic adaptive capturing. The control module continuously monitors color differences and adjusts the camera's exposure time in real-time. This dynamic approach ensures that long-time multi-exposure recognition is applied only when color differences are subtle and require enhanced detection, while short exposure times are used for obvious color differences, thus maintaining overall printing efficiency.
3Device complexity
If the camera captures all colors with the same exposure time, then the system complexity is reduced, but the adjustment precision deteriorates for colors with small differences
Solution Approach 1:
The patent applies local quality by assigning different exposure times to different nozzles based on their specific color characteristics. Instead of using a uniform exposure time for all nozzles, the control module calculates color differences for each adjacent nozzle pair and adjusts the exposure time locally for each camera. This localized adjustment ensures that each color transition is captured with optimal precision, improving overall overprinting quality without requiring a fundamentally more complex system architecture.
Solution Approach 2:
The system introduces dynamic adaptability at the nozzle level. Each camera's exposure time is independently adjusted based on the specific color difference it needs to detect. This dynamic, nozzle-specific approach improves precision for subtle color differences while maintaining a relatively simple overall system structure, as the complexity is managed through software control rather than hardware multiplication.
Data Source
AI summary
An automatic registration control system and structure for printing are provided, and belong to the technical field of overprinting equipment. The automatic registration control system for printing includes a control module, a plurality of image capture modules electrically connected to the control module, and a drive module. The plurality of image capturing modules are in one-to-one correspondence to a plurality of nozzles of an overprinting device. The plurality of image capturing modules are respectively arranged behind the corresponding nozzles. The drive module is electrically connected to the control module. The plurality of image capturing modules are configured to: capture the paper and upload captured images to the control module. The control module adjusts stay time according to the captured images. Both adjustment precision and working efficiency can be ensured.