Printing Press Torsion Model for Register Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling sheet-fed rotary offset printing presses struggle to maintain accurate register alignment between color separations due to torsion phenomena caused by mechanical coupling of cylinders, which cannot adapt to changes in operating parameters such as temperature and humidity, leading to image errors and inefficiencies.
Innovation Solution
A method using a torsion model stored in a control computer to continuously calculate and adjust the mechanical rotation and position of coupled cylinders based on measurable operating parameters like torque and power usage, allowing for real-time correction of register deviations and adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical coupling of cylinders is used to achieve register accuracy during overprinting, then register accuracy is improved, but torsion phenomena occur at defined loads causing register deviations
Solution Approach 1:
The patent applies parameter changes by monitoring operating parameters (torque, power consumption, printing speed) and dynamically adjusting register settings based on detected changes in the torsion state. The control computer modifies register adjustment values according to changes in these parameters, allowing the system to adapt to varying torsion conditions while maintaining register accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring operating parameters and using this information to adjust register settings. The control computer detects changes in torque, power consumption, or printing speed, compares these against stored reference values, and automatically modifies register adjustment values to compensate for torsion-induced deviations, creating a closed-loop control system.
2Device complexity
If a value table stored in the printing press is used for register adjustment, then device complexity is reduced, but the system cannot react to changes within the printing press after delivery
Solution Approach 1:
The patent implements feedback by continuously monitoring operating parameters and using this information to adjust register settings. The control computer detects changes in torque, power consumption, or printing speed, compares these against stored reference values, and automatically modifies register adjustment values to compensate for torsion-induced deviations, creating a closed-loop control system.
Solution Approach 2:
The patent applies dynamics by transitioning from a static value table approach to a dynamic control system that continuously adapts register settings based on real-time monitoring of operating parameters. The system automatically adjusts register adjustment values in response to changing torsion conditions, enabling the printing press to adapt to variations in operating conditions without requiring complex manual reconfiguration.
3Adaptability or versatility
If manual intervention is used for register adjustment, then adaptability to changing conditions is improved, but productivity is reduced due to increased time consumption
Solution Approach 1:
The patent implements self-service by enabling the printing press to automatically monitor its own operating parameters and adjust register settings without manual intervention. The control computer continuously detects changes in torque, power consumption, or printing speed, compares these against reference values, and automatically modifies register adjustment values, allowing the system to self-correct torsion-induced register deviations and maintain productivity.
Data Source
AI summary
A method and an apparatus control a printing press having a plurality of printing units, a plurality of cylinders which are coupled mechanically to one another and a control computer for controlling at least one drive motor which drives the mechanically coupled cylinders. A torsion model is stored in the machine computer for describing the torsion state of the cylinders in the printing press which are rotatably coupled mechanically to one another, as a function of at least one measurable operating parameter or at least one variable of the printing press which is known to the machine computer. A control of the printing press is performed by the control computer on the basis of the values which are calculated by the torsion model.