Web Printing Alignment for Mixed Repeat Lengths
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Solution Overview
Problem
In conventional web-fed printing systems, printing multiple labels with different repeat lengths side-by-side results in wasted substrate due to misalignment and white space or partially printed labels, as the existing technologies struggle to accommodate varying label sizes within a single frame.
Innovation Solution
The solution involves either a digital shift of the data in the frame or a physical shift of the substrate during the printing process, where the labels are processed through Raster Image Processing (RIP) to convert images into bitmaps, and then duplicated to generate complete frames, allowing for the elimination of white space by adjusting the printing position accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple labels with different repeat lengths are printed side-by-side in the same frame, then the printing system can accommodate varying label sizes, but white space and misalignment occur between labels
Solution Approach 1:
The system performs preliminary calculations of repeat lengths and offsets before printing begins. The controller computes the exact positioning required for each label based on its repeat length and stores this information in advance, allowing precise alignment without real-time adjustments during the printing process.
Solution Approach 2:
The system dynamically adjusts printing parameters including the position of the print head, the timing of substrate feeding, and the repetition intervals for different label types. By changing these parameters based on pre-calculated offsets, the system maintains precise alignment despite varying label dimensions.
2Adaptability or versatility
If labels with different repeat lengths are printed side-by-side, then various label sizes can be accommodated, but wasted substrate occurs due to white space
Solution Approach 1:
The system pre-calculates the optimal layout and positioning of multiple labels with different repeat lengths before printing. By determining the exact offsets and repetition patterns in advance, the system eliminates white space between labels and maximizes substrate utilization without requiring physical prototypes or trial prints.
Solution Approach 2:
The controller adjusts printing parameters such as the repetition interval and horizontal positioning for each label type based on pre-computed values. This allows different labels to be printed in a tightly packed arrangement that eliminates wasted substrate while maintaining the required repeat lengths for each label type.
3Productivity
If the substrate is fed continuously through the printer, then printing efficiency is maintained, but labels with different repeat lengths cannot be precisely aligned
Solution Approach 1:
The system pre-calculates all positioning offsets and timing adjustments required for different label types before the continuous printing process begins. This allows the substrate to be fed continuously at high speed while the print head makes precise positional adjustments based on pre-determined parameters, maintaining both productivity and alignment accuracy.
Solution Approach 2:
The system introduces dynamic adjustments to the continuous printing process by varying the print head position and substrate feeding timing based on pre-calculated offsets for different label types. This allows the otherwise continuous and high-speed process to accommodate precise alignment requirements for labels with different repeat lengths.
Data Source
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AI summary
A printing system including a printing mechanism, a substrate feeder, a print controller, and digital information stored on computer readable media. The digital information includes one or more rows of a first image having a first repeat length side by side with one or more rows of a second image having a second repeat length different from the first repeat length, the first image side by side with the second image comprising a series of composite image groupings. The print controller is configured to access the stored digital information and control the print mechanism to cause the first and second images to be printed on a continuous web of substrate without excess white space between adjacent images or discontinuities caused by the different first and second repeat lengths, by periodically physically shifting the substrate in a reverse direction or by digitally shifting the image groupings before printing them.