Multi-Pass Media Alignment via Backside Pattern Detection
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Solution Overview
Problem
Multiple passes over media by a printer assembly can result in reduced marking quality due to misalignment caused by slippage, backlash, and gear issues, which existing technologies fail to accurately correct.
Innovation Solution
An apparatus comprising a printer assembly, a sensor, and a controller that detects a backside pattern on the media using a light source and detector, calculates offsets between passes, and adjusts the media's position or printing timing to ensure accurate alignment and improved marking quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple passes are made over the media by the printer assembly, then the color gamut and marking contrast are improved, but the alignment precision deteriorates due to slippage, backlash, and gear issues
Solution Approach 1:
The system uses a sensor to detect a backside pattern on the media during each pass, and the processor compares patterns from different passes to determine offset values. This feedback mechanism allows the system to measure and correct alignment errors between passes, resolving the contradiction between achieving multiple passes for improved marking quality and maintaining alignment precision despite mechanical slippage and backlash
Solution Approach 2:
The system performs detection of the backside pattern and calculation of offset values before the actual marking process. By determining the alignment offset in advance through pattern detection and comparison, the system can pre-adjust the positioning to ensure accurate alignment across multiple passes, preventing misalignment before it occurs
2Measurement precision
If the media position or printing timing is adjusted to correct misalignment, then the alignment precision is improved, but the device complexity increases
Solution Approach 1:
The system uses optical copying by detecting the backside pattern through a sensor and processor. Instead of complex mechanical adjustment mechanisms, the system creates a digital representation of the pattern position and uses this copy to calculate and correct alignment offsets, simplifying the overall system while achieving high precision
Solution Approach 2:
The system replaces complex mechanical alignment adjustment mechanisms with an optical detection and computational approach. By using a sensor to detect patterns and a processor to calculate offsets, the system substitutes mechanical complexity with optical and computational simplicity, achieving precise alignment through software-based correction rather than mechanical adjustment
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
The apparatus effectively corrects misalignment and enhances marking quality by precisely aligning subsequent passes over the printer assembly, improving the overall quality of the markings on the media.
Implementation Method 1
detects a backside pattern on the media using a light source and detector
Data Source
AI summary
An example of apparatus to align media. The apparatus includes a printer assembly to form markings a first side of a media. The apparatus also includes a sensor to detect a backside pattern on each pass at multiple locations. The apparatus includes a processor in communication with the sensor. The processor is to compare the backside pattern measured on multiple passes to determine offset amounts. The apparatus also includes a controller to adjust the media relative to the printer assembly based on the offset values.