Inline Sensor Paper Scaling for Printing Accuracy
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Solution Overview
Problem
Current printing technologies face challenges in accurately adjusting image size for high-quality commercial printing, as existing methods require labor-intensive manual measurements and are prone to inaccuracies due to paper expansion or shrinkage over time.
Innovation Solution
The implementation of an inline sensor system in printing devices that measures the dimensions of paper surfaces and determines scaling factors for both front and rear surfaces, allowing for real-time adjustments and improved accuracy across varying ink coverage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual measurement methods are used to adjust image size, then printing accuracy can be improved, but labor intensity and time consumption increase significantly
Solution Approach 1:
The patent replaces manual mechanical measurement with an automated optical measurement system using a scanner to capture paper dimensions. The system automatically calculates scaling factors and adjusts image sizes, eliminating the need for operators to manually measure paper with rulers or calipers, thus reducing time consumption while maintaining or improving printing accuracy.
Solution Approach 2:
The system performs self-measurement and self-adjustment by automatically detecting paper dimensions through the scanner and computing the appropriate scaling factors. The printing device autonomously adjusts image sizes based on measured paper characteristics without requiring external manual intervention, thereby reducing labor intensity and time consumption.
2Manufacturing precision
If manual measurement is performed before or after printing, then scaling adjustments can be made, but measurement accuracy decreases due to paper expansion or shrinkage over time
Solution Approach 1:
The system performs measurement immediately before printing operations by scanning the paper surface right before the printing process begins. This preliminary measurement ensures that the paper dimensions are captured at the moment of printing, eliminating errors caused by paper expansion or shrinkage that would occur if measurements were taken earlier and then stored for later use.
Solution Approach 2:
The system implements a feedback loop where the scanner continuously measures paper dimensions, the system calculates scaling factors based on these measurements, and then applies the scaling adjustments in real-time. This closed-loop feedback ensures that any changes in paper dimensions due to environmental factors are immediately detected and compensated for, maintaining measurement accuracy and consistency throughout the printing process.
3Device complexity
If a single scaling factor is applied to both front and back surfaces, then processing is simplified, but printing accuracy decreases when front and back surfaces have different dimensions
Solution Approach 1:
The patent divides the paper into two separate measurement zones: the front surface and the back surface. The scanner independently measures dimensions of each surface, and the system calculates separate scaling factors for each side. This segmentation allows each surface to be optimized individually, ensuring that images printed on the front and back surfaces both achieve maximum accuracy even when the two surfaces have different dimensions.
Solution Approach 2:
The system applies different scaling factors to different surfaces of the paper based on their specific measured dimensions. Instead of using a uniform scaling factor for the entire paper, the system tailors the scaling adjustment locally to each surface's characteristics, ensuring that each side receives the appropriate scaling treatment for optimal printing accuracy.
Data Source
AI summary
Scaling factors are applied during printing operations to account for a change in the size of sheets. A sensor within a printing device captures an image to measure dimensions of a front surface of a target sheet of paper. A first scaling factor is determined for the front surface of the target sheet based on the measured dimensions as compared to target dimensions for the sheet. The sensor also captures an image to measure dimensions of a rear surface of the target sheet of a paper after ink or toner is applied to the sheet. A second scaling factor is determined for the rear surface of the target sheet based on the measured dimensions. The first scaling factor and the second scaling factor are applied to processing of subsequent sheets to meet the change in the size of sheets during printing operations.