Intaglio Printer Wiping Roller Contact Pressure Adjustment
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Solution Overview
Problem
Conventional intaglio printing presses face challenges in maintaining optimal contact pressure between the wiping roller and the intaglio cylinder, leading to excessive wear and defective printing products due to manual adjustments, which are time-consuming and labor-intensive, and result in premature replacement of the wiping roller.
Innovation Solution
A method and device that automatically store and adjust the wiping roller's position at different speed states, allowing for precise control of contact pressure through a contact-pressure adjustment mechanism, eliminating the need for continuous manual intervention and reducing wear on the wiping roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the wiping roller is thermally expanded by heat generated during high-speed rotation, then the nip pressure between the intaglio cylinder and wiping roller increases, but the wear of the wiping roller surface is abnormally increased and its life is shortened
Solution Approach 1:
The system performs preliminary adjustment of the wiping roller position during low-speed rotation before high-speed rotation begins. The adjustment mechanism positions the wiping roller at an optimal distance from the intaglio cylinder surface, preventing excessive thermal expansion and contact pressure during subsequent high-speed operation, thereby reducing wear and extending roller life
Solution Approach 2:
The system dynamically adjusts the wiping roller position based on rotation speed. During low-speed rotation, the roller is positioned closer to maintain adequate contact for ink removal. During high-speed rotation, the roller is positioned farther away to compensate for thermal expansion and prevent excessive nip pressure, thus maintaining optimal conditions throughout the printing process
2Force
If manual adjustment of nip pressure is performed by moving the wiping roller axis closer to the intaglio cylinder axis, then contact pressure is maintained, but the wear of the wiping roller surface increases abnormally and life is shortened
Solution Approach 1:
The system performs preliminary positioning of the wiping roller during low-speed rotation to establish optimal contact pressure before thermal expansion occurs. This preliminary action prevents the need for excessive initial closeness between the roller and cylinder, thereby reducing wear during the adjustment phase
Solution Approach 2:
The system uses feedback from print quality detection and rotation speed sensing to automatically adjust the wiping roller position. This closed-loop control maintains optimal contact pressure without requiring manual intervention, preventing both excessive wear and poor print quality
3Manufacturing precision
If the operator performs manual adjustment of nip pressure by checking printing products during test printing and final printing, then proper printing products can be obtained, but this causes burden on the operator and produces defective printing products and wasted materials
Solution Approach 1:
The system performs automatic adjustment of the wiping roller position based on feedback from print quality detection and rotation speed sensing. This self-service capability eliminates the need for operator intervention in manual adjustment, reducing labor burden and minimizing the production of defective printing products and wasted materials
Solution Approach 2:
The system implements a closed-loop control mechanism where print quality is continuously monitored and feedback is used to automatically adjust the wiping roller position. This ensures optimal printing quality is maintained without requiring manual checking and adjustment by the operator
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
This solution reduces operator burden, minimizes defective printing products, and extends the life of the wiping roller by maintaining optimal contact pressure, thereby improving the efficiency and quality of the printing process.
Implementation Method 1
a wiping roller is thermally expanded by the heat generated by the rotation of the printing press, which increases the nip pressure between an intaglio cylinder and the wiping roller
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Provided is a method for automatically adjusting the contact pressure between an intaglio cylinder and a wiping roller that further limits the amount of defective prints generated. The method adjusts said contact pressure by changing the position of the wiping roller shaft center with respect to the intaglio cylinder shaft center using a contact pressure adjustment motor. At least the position of the wiping roller shaft center at low speed and the position of the wiping roller shaft center during printing operation for which the contact pressures have been optimized during a previous printing are stored. Before starting the current printing operation, the wiping roller is moved to the stored low speed position. Then when the current printing operation is started, the wiping roller is moved to the stored printing operation position.