Rotary Printing Press Automated Test Print Web Rewind
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Solution Overview
Problem
Rotary printing machines require manual and labor-intensive methods for producing test prints, which are time-consuming and prone to inaccuracies, especially in high-speed operations, leading to inefficiencies in material and ink consumption, and increased risk of accidents.
Innovation Solution
An automated test print routine is implemented in the control device of the printing machine, which positions and accelerates the printing cylinders, records the print path, decelerates the web to a standstill, and rewinds it to expose the printed pattern on the reel's surface, allowing for precise inspection and measurement, reducing manpower and material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual methods are used to produce test prints and locate the printed pattern, then the process requires human intervention and judgment, but it increases labor intensity, time consumption, and risk of accidents
Solution Approach 1:
The system performs self-service by automatically recording the print path during web transport, calculating the rewind distance based on recorded position and offset, and executing the rewind operation without human intervention. The control device autonomously completes the entire test print and location process, eliminating the need for operators to manually track and locate printed patterns.
Solution Approach 2:
The patent replaces manual mechanical operations with an automated control system that uses electronic recording and calculation. Instead of operators physically marking or tracking the web, the system electronically records the print path and automatically calculates rewind distance, substituting human mechanical actions with automated electronic control.
2Manufacturing precision
If the web is accelerated to target speed and then decelerated to produce a test print, then the print sample is produced under actual print conditions, but the printed pattern ends up deep in inner layers of the reel requiring extensive web unwinding to locate
Solution Approach 1:
The system uses feedback by recording the actual print path during web transport at target speed, then using this recorded position information to calculate the precise rewind distance. This feedback loop ensures the web is rewound to the exact location where the test print was made, bringing the pattern to the outer surface for immediate inspection without unnecessary web unwinding.
Solution Approach 2:
The system performs preliminary action by recording the print path during the acceleration and deceleration phases, then using this pre-recorded information to determine the exact rewind distance before the rewind operation begins. This preliminary recording enables precise location of the test print without trial and error.
3Measurement precision
If multiple people are used to mark and locate the print pattern manually, then the location accuracy may be improved, but the complexity of the process and risk of accidents increase
Solution Approach 1:
The control device performs self-service by automatically recording the print path and calculating the rewind distance without requiring multiple operators. The system autonomously determines the precise location of the test print through electronic recording and computation, eliminating the need for coordinated manual marking and location activities.
Solution Approach 2:
The patent replaces manual marking and location methods with electronic recording and automated calculation. Instead of operators using physical markers or visual tracking, the system electronically records the print path and computationally determines the rewind distance, achieving high precision through automated electronic systems rather than human coordination.
Data Source
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AI summary
Rotary printing press with a number of inking units (16), each comprising an impression cylinder (18), a web transport system (28) for transporting a web (24) of substrate at a controllable speed through the inking units and to a rewinder (32), and an electronic control unit (40) for controlling functional sequences in the printing press, characterized in that an automatic proofing routine comprising the following steps is implemented in the control unit (40): - positioning the impression cylinders (18) against the web (24), starting the web transport system (28) and accelerating the web to a predetermined target speed, - upon reaching the target speed: beginning to record the path traveled by a print sample printed on the web by the inking units during the movement of the web, and decelerating the web to a standstill while continuing to record the path.- when the web is stationary: rewind the web by the recorded distance less an offset corresponding to the distance measured along the web between the inking units (16) and the rewinder (32).