Printing Cylinder Alignment Using Imaging and Inversion
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Solution Overview
Problem
Existing flexographic printing systems face challenges in achieving precise, reliable, and repeatable alignment of printing plates with printing cylinders, and ensuring consistent mounting force, particularly for plates of varying formats and sizes.
Innovation Solution
The apparatus employs a system with rotatable pressure rollers, an imaging system, and a control system for precise alignment and mounting, allowing for independent rotation and transverse movement of the printing cylinder to align and mount printing plates with constant tension, using a double-action adhesive film for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a movable work table is used to align the printing plate, then the printing plate can be displaced for alignment, but the alignment precision and reliability are insufficient for plates of varying formats
Solution Approach 1:
Instead of moving the work table to align the printing plate, the invention inverts the approach by keeping the work table stationary and moving the printing cylinder laterally to achieve alignment. The printing cylinder can be displaced transversely relative to the printing plate, allowing precise alignment without complex work table movement mechanisms.
Solution Approach 2:
The invention replaces mechanical alignment systems with an imaging system that detects the positions of the printing plate and printing cylinder using markers. The control system processes these images to calculate precise positioning, substituting mechanical measurement and adjustment with optical detection and computational control.
2Manufacturing precision
If a manipulator device is used to grip and displace the printing plate, then the printing plate can be positioned, but the alignment precision and control of mounting force are insufficient
Solution Approach 1:
The invention replaces manual manipulator operations with an automated system combining imaging detection, computational positioning, and program-controlled execution. The imaging system captures marker positions, the control system calculates the optimal mounting path and force distribution, and the program automatically executes the mounting process with precise force control.
Solution Approach 2:
The invention implements feedback control by using the imaging system to continuously monitor the positions of the printing plate and printing cylinder during the mounting process. The control system processes this real-time information to make precise adjustments, ensuring accurate alignment and consistent mounting force throughout the operation.
3Adaptability or versatility
If the printing cylinder is fixed in position, then the mounting structure is simple, but the alignment flexibility for different plate formats is limited
Solution Approach 1:
The invention transforms the fixed printing cylinder into a dynamic positioning system. The printing cylinder can be displaced laterally and rotated to accommodate different printing plate formats and sizes. This dynamic capability is controlled through program instructions that adjust the cylinder position based on the specific plate dimensions and alignment requirements.
Solution Approach 2:
The printing cylinder is designed with multi-functionality to handle various plate formats. By combining lateral displacement, rotation capability, and program-controlled positioning, a single cylinder can accommodate different plate sizes and orientations, eliminating the need for multiple specialized cylinders for different formats.
4Reliability
If manual alignment methods are used, then the equipment is simple, but the repeatability and reliability of mounting are insufficient
Solution Approach 1:
The invention replaces manual alignment and mounting operations with an automated system. The imaging system automatically detects marker positions, the control system automatically calculates positioning parameters, and the program automatically executes the mounting process. This eliminates human error and variability, significantly improving repeatability and reliability.
Solution Approach 2:
The system performs self-alignment and self-correction through the imaging system and control algorithm. The markers on the printing plate and cylinder enable the system to automatically determine their relative positions and make necessary adjustments without human intervention, ensuring consistent and reliable mounting results.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables automatic, precise, and reliable mounting of printing plates of any format, ensuring correct longitudinal, transverse, and circumferential positioning, with real-time correction of mounting deviations and consistent tension, enhancing the reliability and repeatability of the mounting process.
Implementation Method 1
Gripping of the rollers on the printing plate and consequent movement is performed using the friction induced by the pressure rollers 6 and 7 on the printing plate 2 against the surface 17
Implementation Method 2
The stable connection between printing plate and cylinder (or sleeve) is performed by means of a double-action adhesive film spread over the outer surface of the cylinder
Data Source
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AI summary
The invention relates to the field of printing apparatusses, in particular flexographic printing apparatusses, and more specifically relates to an apparatus (1) and method for mounting a printing plate (2) on a printing cylinder (4) or a printing sleeve, comprising a system for pre-alignment (5, 8) of a printing plate (2) and real-time alignment (5, 8) of the said printing plate (2) during mounting.