Adaptive Cutting System for Deformed Printed Sheets
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Solution Overview
Problem
Existing methods fail to effectively separate printed products from a sheet while maintaining geometrical tolerances during printing process-related deformations, such as trapezoidal deformation, which can lead to defects and waste in high-speed production processes like banknote printing.
Innovation Solution
A method involving a cutting system with a rotatable cutting table and a control unit that adjusts cutting positions using mathematical optimization to ensure printed products meet tolerances, employing identification features and real-time feedback from quality testing devices to maintain 'best fit' adjustments during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed printing is used to increase productivity, then production speed increases, but sheet deformation (trapezoidal distortion) occurs leading to geometric tolerance violations
Solution Approach 1:
The patent applies preliminary action by detecting sheet deformation at an early stage in the production process (immediately after printing) and calculating compensation values before the cutting operation. The control unit pre-calculates the adjusted cutting path based on detected trapezoidal distortion, allowing the cutting device to compensate for deformation without slowing down production. This proactive approach prevents tolerance violations rather than reacting to defects after they occur.
Solution Approach 2:
The patent implements feedback by using detection devices to continuously monitor sheet position and deformation during high-speed printing, then feeding this information back to the control unit. The control unit processes the detected deformation data and adjusts cutting parameters in real-time based on the feedback loop. This closed-loop control ensures that even at high printing speeds, the cutting operation adapts to actual sheet conditions and maintains geometric tolerances.
2Manufacturing precision
If sheet deformation is detected and cutting parameters are adjusted in real-time, then manufacturing precision is maintained, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a control unit that performs multiple functions: it detects sheet deformation, calculates compensation values, determines adjusted cutting paths, and controls the cutting device. This multi-functional approach consolidates what could be separate complex systems into a single integrated unit, reducing overall system complexity while maintaining precision. The same control unit handles both monitoring and actuation, eliminating the need for separate dedicated devices for each function.
Solution Approach 2:
The patent uses an intermediary approach by introducing a control unit that acts as a mediator between the detection devices and the cutting device. Rather than having direct complex interactions between multiple specialized components, the control unit serves as an intelligent intermediary that receives deformation data, processes it through mathematical calculations, and translates it into adjusted cutting commands. This intermediary layer simplifies the system architecture by centralizing the complexity in a single coordinating unit rather than distributing it across multiple independent components.
3Device complexity
If traditional fixed cutting paths are used, then device complexity is minimized, but printed products exceed permissible tolerances due to sheet deformation
Solution Approach 1:
The patent applies dynamics by transforming the cutting system from a static, fixed-path approach to a dynamic, adaptive approach. The cutting path is no longer predetermined but is continuously adjusted based on real-time sheet deformation detection. The control unit dynamically recalculates cutting trajectories during production runs, allowing the system to adapt to varying sheet conditions while maintaining simple hardware. This dynamic adjustment capability enables precision without requiring complex mechanical cutting systems.
Data Source
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AI summary
The invention relates to a method for separating printed products (03) that are printed together onto a sheet (01), wherein printed products (03) printed onto the sheet (01) in a printing machine (06) are separated in a cutting system (07) using a cutting device (11), wherein each of said printed products (03) has a respective identification feature (09) identifying its respective position on the sheet (01), wherein the sheet (01) is deformed as it passes through the printing machine (06), wherein the separated printed products (03), that are also deformed as a result of the deformation of the sheet (01), are checked in a quality control device (08) arranged downstream of the cutting system (07) for adherence to a tolerance, at least in terms of their respective length (l03) and/or width (b03), wherein, for each printed product (03) that has be identified in terms of its position, the quality control device (08) determines information relating to an exceeding of the tolerance at least of the length (l03) and/or width (b03) of the relevant printed product (03) and transfers this information to a control unit (21) of the cutting system (07) in an allocation to the position determined on the sheet (01), wherein, according to the information transferred by the quality control device (08), for printed products (03) to be subsequently separated in the cutting system (07) and arranged in the same position on the sheet (01), the control unit (21) of the cutting system (07) adjusts the relevant sheet (01) and the cutting device (11) relative to one another in their respective positions, in such a way that the respective tolerance is adhered to for each of the printed products (03) to be separated, wherein the adherence to the tolerance occurs by calculating the respective position of the sheet (01) and cutting device (11) to be adjusted relative to one another in the control unit (21) using a mathematical optimisation method, wherein the sheet (01) is placed on a cutting table (13) in the cutting system (07), and wherein the control unit (21) of the cutting system (07) adjusts the position of said sheet (01) relative to the cutting device (11) according to the calculated position.