Printing Pen Alignment via Media Output Angle Correction
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Solution Overview
Problem
Existing automatic pen alignment methods in printing apparatuses are ineffective in reducing the influence of unstable or transitional conditions of media advance, leading to suboptimal printing quality, especially when a new roll of media is loaded, as they fail to account for changes in media output angle during the alignment process.
Innovation Solution
The method involves measuring the media output angle using a stationary optical sensor during the pen alignment process and subsequent printing, modifying the alignment correction algorithm to account for changes in the media output angle, ensuring accurate ink dot positioning and improved printing quality by continuously monitoring and adjusting for variations in the media advance direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If automatic pen alignment is performed during media stabilization phase, then alignment process can be completed quickly, but printing quality deteriorates due to unstable media output angle
Solution Approach 1:
The system dynamically adjusts the alignment correction algorithm based on real-time media output angle measurements. The correction algorithm is modified continuously as the media stabilizes, transitioning from initial alignment to final optimized alignment as the media output angle becomes stable.
Solution Approach 2:
The system uses feedback from optical sensors measuring the media output angle to continuously refine the alignment correction algorithm. The measured output angle is fed back to modify the correction parameters, ensuring the alignment adapts to the actual media behavior during stabilization.
2Manufacturing precision
If media output angle is measured and correction algorithm is modified, then printing quality improves, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The optical sensor system serves multiple functions: it measures the media output angle for alignment correction, monitors media stability during loading, and provides data for continuous process optimization. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The system changes the correction algorithm parameters based on measured output angle values. By adjusting the correction parameters dynamically rather than using fixed complex algorithms, the system achieves high precision while keeping the processing logic relatively simple.
3Device complexity
If correction algorithm is applied without considering media output angle changes, then alignment process is simple, but vertical line straightness deteriorates
Solution Approach 1:
The system continuously monitors the media output angle and uses this feedback to modify the correction algorithm. This ensures that the alignment correction accurately compensates for actual media behavior, maintaining vertical line straightness even as media conditions change.
Solution Approach 2:
The correction algorithm transitions from a static approach to a dynamic one that adapts to media output angle changes. The algorithm is modified in real-time based on measured angles, allowing it to maintain effectiveness throughout the printing process despite varying media conditions.
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 approach significantly enhances printing quality by dynamically adjusting the alignment correction algorithm based on real-time media output angle measurements, reducing errors such as lack of vertical line straightness and grain, even during media stabilization phases, thereby maintaining high-quality output throughout the printing process.
Implementation Method 1
measuring an output angle of the media, defined as the angle between the y-axis and the actual direction of advance of the media, with at least one optical sensor arranged stationary on the printing apparatus
Data Source
AI summary
A method for automatic pen alignment in a printing apparatus, wherein the printing apparatus has a scan direction or x-axis and a media advance direction or y-axis, orthogonal to said scan direction or x-axis, the method comprising the steps of performing a pen alignment process, determining an alignment correction algorithm to be applied during subsequent printing, to compensate for the misalignment determined in said pen alignment process, measuring an output angle of the media, defined as the angle between the y-axis and the actual direction of advance of the media, with at least one optical sensor arranged stationary on the printing apparatus, and employing the measured output angle to modify the alignment correction algorithm to be applied during subsequent printing.