Carriage Posture Detection in Liquid Ejecting Apparatus
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Solution Overview
Problem
In liquid ejecting apparatuses like ink jet printers, posture changes in the carriage can lead to image-forming accuracy issues due to changes in the distance between the ink ejector and recording paper, exacerbated by electromagnetic noise from the ink ejection signal, which complicates accurate detection and correction of carriage posture.
Innovation Solution
A liquid ejecting apparatus with a detector on the carriage that detects posture changes before printing, providing posture-change information to correct the ejection process, thereby reducing noise interference and enhancing detection accuracy, and includes a controller to adjust ejection parameters based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gyro sensor is mounted on the carriage to detect posture change with high accuracy, then detection accuracy is improved, but electromagnetic noise from the ink ejection signal interferes with the gyro sensor detection
Solution Approach 1:
The posture change detection is performed in advance during the carriage movement phase, before the ink ejection process begins. This timing separation ensures that the gyro sensor detects posture changes when no electromagnetic noise is present, eliminating the interference problem while maintaining high detection accuracy
2Productivity
If the number of ink ejecting nozzles is increased for high-speed printing, then productivity is improved, but electromagnetic noise increases and significantly influences the gyro sensor
Solution Approach 1:
The system performs posture change detection during the carriage movement phase before ink ejection begins. This allows the gyro sensor to capture accurate posture data without being affected by electromagnetic noise from any number of nozzles, enabling high-speed printing with increased nozzles while maintaining detection accuracy
3Speed
If the detector detects posture change during liquid ejection, then real-time correction is achieved, but electromagnetic noise prevents normal detection
Solution Approach 1:
The system performs posture change detection in advance during carriage movement, before ink ejection begins. This preliminary detection allows the control unit to calculate correction amounts and prepare corrected ejection signals before printing starts, achieving both accurate detection and timely correction without electromagnetic interference
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 improves image quality by accurately correcting posture changes before printing, reducing electromagnetic noise influence and allowing for higher-speed printing without interrupting the process.
Implementation Method 1
a detector that is provided in the carriage and detects a change in posture of the carriage
Data Source
AI summary
A liquid ejecting apparatus includes: a support that extends in a second direction intersecting a first direction in which a printing medium is transported; a carriage that is connected to the support and is movable in the second direction; an ejector that is provided in the carriage and ejects a liquid to the printing medium; and a detector that is provided in the carriage and detects a change in posture of the carriage. In a case where the liquid is not ejected from the ejector, the carriage moves in the second direction, and the detector detects the change in posture of the carriage. The detector outputs posture-change amount information based on the change in posture of the carriage. Ejection of the liquid is corrected based on the posture-change amount information.