Circumferential Register Setup Using Optical Mark Scanning
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Solution Overview
Problem
In rotary printing machines, especially multi-column machines like serial gravure printing machines, achieving and maintaining the phase position of printing cylinders during continuous printing is time-consuming and often requires manual intervention, leading to material waste as the correct register position is found.
Innovation Solution
A method involving the use of positioning marks on printing cylinders, scanned by sensors, to adjust the cylinders' circumferential positions based on geometric data and web speed, allowing for automatic alignment without printing waste, and enabling reuse of previously printed material web sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual intervention is used to find the correct phase alignment of printing cylinders, then the registration accuracy can be achieved, but the setup time increases and material waste occurs
Solution Approach 1:
The patent replaces manual mechanical adjustment and visual inspection with an automated optical sensing system. Print marks are automatically detected by sensors, and the control system calculates and adjusts cylinder positions based on detected mark positions, eliminating manual intervention while maintaining registration accuracy
Solution Approach 2:
The patent uses print marks as reference copies of the desired registration position. These marks serve as visual references that the sensing system detects to determine actual cylinder positions, enabling automated comparison with target positions and precise adjustment accordingly
2Manufacturing precision
If manual adjustment of printing cylinders is performed to achieve correct register position, then registration precision can be achieved, but material waste is generated during the adjustment process
Solution Approach 1:
The patent performs preliminary positioning of printing cylinders using positioning marks detected by sensors before actual printing begins. The system calculates required adjustments based on detected mark positions and pre-adjusts cylinder phases, eliminating the need for trial printing and material waste during setup
Solution Approach 2:
The patent replaces trial-and-error manual adjustment that consumes material with an automated optical measurement and control system. The sensing system detects print mark positions, the control system calculates precise adjustment amounts, and actuators automatically position cylinders correctly without consuming printing material
3Manufacturing precision
If printing is performed to determine correct phase alignment, then the register position can be found, but printing material is consumed in the process
Solution Approach 1:
The patent extracts the registration determination function from the printing process itself. Instead of using printed images to find register positions, the system uses separate positioning marks detected by sensors during setup, separating the measurement function from the production function and eliminating material consumption for registration finding
Solution Approach 2:
The patent uses positioning marks as reference copies that contain registration information without requiring actual printing. These marks are detected by sensors to determine cylinder positions, providing the necessary registration data without consuming printing material that would be required if actual print images were used for alignment
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 method significantly reduces setup time and material waste by automating the registration process, ensuring precise alignment of printing cylinders and allowing immediate reuse of material web sections, enhancing operational efficiency and reducing manual intervention.
Implementation Method 1
scanning of the print mark in at least a second printing unit, in which the at least one second printing cylinder is inserted, by a print mark sensor
Data Source
Figure 1~2
Figure 3
AI summary
The invention describes a method for setting up a circumferential register for a print job in a multi-colour printing press (100) having a first and at least one second plate cylinder (111, 121, 131), wherein the method comprises the steps: • a) inserting the plate cylinders into printing units (110, 120, 130); b) positioning the plate cylinders in the circumferential direction on the basis of a positioning mark (113, 123, 133) located on the plate cylinder; c) printing a print mark (150) located on the first plate cylinder (111) seen in the transport direction of a web (102); d) scanning the print mark in at least one second printing unit (120, 130), in which the at least one second plate cylinder (121, 131) is inserted, by means of a print mark sensor (125, 135); e) setting the at least one second plate cylinder (121, 131) in the circumferential direction on the basis of geometric data of the printing unit and the time at which the print mark sensor scans the print mark (150), so that a register mark of the at least one second plate cylinder is in a capture range of the print mark sensor.