Flexible Support Overprinting System with Relief Printing Capability
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Solution Overview
Problem
Existing overprint systems are limited in their ability to apply relief printing techniques and fail to provide the necessary precision and cost-effectiveness for modifying complex or miniature elements on flexible supports, such as those requiring Braille alphabet printing, leading to unmet needs in recycling and environmental preservation.
Innovation Solution
An overprint system comprising a rotatable printing cylinder with actuating means and control systems to accurately align and print on flexible supports, allowing for relief printing and precise modification of pre-defined zones, using a combination of rotogravure, flexographic, or relief printing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If known overprint techniques (e.g., rotogravure) are used, then overprinting can be achieved, but relief printing capability is lost
Solution Approach 1:
The patent applies universality by designing a printing system that can perform multiple printing techniques (rotogravure, flexographic, and relief printing) through the same basic apparatus. The printing cylinder can be configured with different printing surfaces or replaced to accommodate various printing methods, allowing the system to achieve both standard overprinting and relief printing (including Braille) capabilities within a single versatile platform.
2Manufacturing precision
If overprint systems are designed for high precision printing, then manufacturing precision improves, but device complexity and cost increase
Solution Approach 1:
The patent applies dynamics through the phase shift detection and correction mechanism. The system dynamically detects phase shifts between the flexible support and printing cylinder during operation and automatically corrects them in real-time. This dynamic adjustment capability allows the system to maintain high printing precision without requiring overly complex static mechanical arrangements, as the precision is achieved through active control rather than purely mechanical precision.
Solution Approach 2:
The patent implements feedback through the phase shift detection device that continuously monitors the relative position between the flexible support and printing cylinder. The detected phase shift information is fed back to the control system, which then adjusts the printing process to compensate for the detected deviations. This closed-loop feedback mechanism enables high precision printing while keeping the overall system design relatively simple and cost-effective.
3Manufacturing precision
If complex or miniature elements are overprinted with high precision, then manufacturing precision improves, but productivity decreases
Solution Approach 1:
The patent applies continuity of useful action by maintaining continuous motion of both the flexible support and printing cylinder throughout the printing process. The phase shift detection and correction operate continuously during printing, allowing the system to achieve high precision on complex or miniature elements without stopping or slowing down the printing process. This continuous operation preserves productivity while ensuring precision through real-time adjustments.
Data Source
AI summary
A system and method for the overprint on flexible supports are described. In particular, the overprint system 1 comprises a printing unit 2 comprising a rotatable printing cylinder 3, having printing zones at the surface thereof, and first actuating means 14, configured to drive in a controllable manner the printing cylinder 3 rotation. The system further comprises a first reel 5 for unwinding a flexible support 4 to be printed, which has preset zones to be overprinted, and a second reel 8 for rewinding the flexible support 4, once it has been printed. A plurality of winding rolls 7 arranges an unwinding path, for the flexible support 4, comprised between the first 5 and the second 8 reels, and passing through the printing unit 2. The system then comprises second actuation means 20, configured to drive in a controllable manner the flexible support 4 advancement along the unwinding path (upstream of the printing unit 2 in the unwinding direction), and control means 10, configured to control in a coordinated manner both the first actuating means 14 and the second actuation means 20, so as to determine at every moment a correspondence of the preset zones to be overprinted of the flexible support 4 with respective printing zones of the printing cylinder 3.