Preprinted Image Alignment in Web Presses
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Solution Overview
Problem
Current cold set web printing processes produce low-quality newspaper prints that cannot incorporate high-quality, glossy ads within the pages, as they require different printing processes and cannot align preprinted images effectively with the moving components of web printing presses.
Innovation Solution
The implementation of an Alignment Control System (ACS) that includes a CPU, user interface, variable speed drive module, motor, Alignment Roller, Nip Roller, and sensor suite to measure and adjust the position of preprinted images relative to the cutoff blade, allowing for the integration of high-quality images within the newspaper pages by aligning them with the moving components of the press.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-quality images are printed using a different printing process, then print quality is improved, but the images cannot be integrated within the newspaper pages and must be inserted separately
Solution Approach 1:
The patent merges two different printing processes (cold set web printing for newspaper pages and heat set printing for high-quality images) into a single integrated system. The high-quality images are printed on separate substrate and then thermally bonded to the newspaper pages during the cold set web printing process, allowing both low-quality and high-quality images to appear together within the same newspaper pages without separate insertion steps.
Solution Approach 2:
The high-quality images are preprinted on a separate substrate using heat set printing before being integrated with the newspaper pages. This preliminary printing action allows the high-quality images to be prepared in advance with proper ink drying and setting, then later bonded to the final newspaper product without disrupting the main printing workflow.
2Manufacturing precision
If preprinted images are aligned to the moving components of the press, then alignment precision is improved, but the complexity of the printing process increases
Solution Approach 1:
The patent employs a feedback control system that uses sensors to detect the position of preprinted images on the substrate and provides real-time feedback to adjust the alignment. The system measures the actual position of images and compares it with the desired position, then automatically adjusts the substrate feed or printing components to correct any misalignment, ensuring precise registration without manual intervention.
Solution Approach 2:
The patent replaces complex mechanical alignment mechanisms with an automated control system that uses sensors, processors, and actuators. Instead of relying on purely mechanical registration devices, the system uses electronic detection and control to achieve precise alignment, reducing mechanical complexity while improving precision through automated feedback control.
Data Source
AI summary
Systems and methods for aligning preprinted images on a roll of substrate to the moving components of a web press are disclosed. A method in accordance with one embodiment includes determining the speed of the moving components of the press, determining the speed of the web of preprinted images and adjusting the speed of the web of preprinted image to match the speed of the web. In particular embodiments, a press which produces rolls of preprinted material can be modified to change the equivalent cutoff length of the press. In further embodiments, a method of pasting new rolls of material to expiring rolls of material is accomplished by modulating the drive speed of the new roll of material to match the expiring roll of material while at the same time aligning the images on the new roll with the expiring roll.