Printing Roller Gap Adjustment for Variable Thickness Workpieces
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Solution Overview
Problem
High-quality multi-color printing on plate-shaped workpieces is challenging due to difficulties in maintaining precise image positioning and roller alignment, especially with large wood-based panels that have varying thicknesses, leading to blurred or rotated prints.
Innovation Solution
Implementing a method to measure the thickness of each workpiece before printing and automatically adjust the pressure rollers using servomotors to maintain a constant effective radius, ensuring accurate pressure distribution and image alignment across the entire width and length of the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between pressure rollers is adjusted to accommodate different workpiece thicknesses, then adaptability to various workpiece dimensions is improved, but manufacturing precision deteriorates due to difficulty in maintaining roller parallelism
Solution Approach 1:
The patent employs feedback mechanisms through sensors that detect the actual position and parallelism of pressure rollers during adjustment. This feedback information is used to automatically correct roller positions and maintain parallelism, ensuring print image positioning accuracy remains within tolerances even when adjusting for different workpiece thicknesses.
Solution Approach 2:
The patent replaces manual mechanical adjustment of pressure roller positions with automated control systems. Motors and control algorithms substitute for manual positioning, enabling precise and repeatable roller alignment that maintains parallelism throughout the adjustment range, thereby preserving manufacturing precision while improving adaptability.
2Ease of operation
If pressure rollers are made flexible to accommodate workpiece variations, then ease of operation is improved, but manufacturing precision worsens due to changes in effective radius affecting printed image length
Solution Approach 1:
The patent implements dynamic adjustment mechanisms that allow pressure rollers to adapt their position and pressure in real-time according to workpiece thickness variations. The system dynamically compensates for effective radius changes by adjusting roller positions and speeds, maintaining constant printed image length despite workpiece variations.
Solution Approach 2:
The patent changes operating parameters such as roller speed, position, and pressure dynamically during the printing process. By monitoring workpiece thickness and adjusting these parameters in real-time, the system maintains constant effective radius and printed image length accuracy while accommodating workpiece variations.
3Device complexity
If manual adjustment of pressure roller parallelism is performed, then device complexity is reduced, but manufacturing precision deteriorates due to inability to achieve required alignment tolerances
Solution Approach 1:
The patent replaces manual mechanical adjustment with automated motorized systems controlled by computer algorithms. Sensors detect roller positions and feed back to control systems that automatically adjust positions, eliminating the need for complex manual adjustment mechanisms while achieving the required alignment tolerances through precise electronic control.
Data Source
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AI summary
The invention relates to a method and a device for printing on flat workpieces in a printing gap (2) formed by two printing rollers (3) whose distance from each other is adjustable, wherein the flat workpiece (7) is transported to the printing gap on a transport device (6) and printed as it passes through the printing gap (2). Before or during transport to the printing gap (2), the thickness of each workpiece is measured, and the printing gap is adjusted before the printing process by changing the distance between the two printing rollers parallel or at an angle to each other, according to the measured thickness of the workpiece.