Liquid Ejection Head Positioning via Sensor Feedback
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Solution Overview
Problem
Existing liquid ejection apparatuses face challenges in accurately controlling the landing position of ejected liquid on a conveyed object, particularly due to positional variations and moving speeds of the object.
Innovation Solution
A liquid ejection apparatus is designed with multiple liquid ejection head units, each equipped with a detection unit that monitors the position, moving speed, and amount of movement of the conveyed object. This information is used by a control unit to adjust the ejection timing of the liquid, ensuring precise landing on the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sensor is used to detect positional variations and adjust print head position, then print quality is improved, but the system complexity and response time are increased
Solution Approach 1:
The patent replaces mechanical position adjustment mechanisms with a liquid ejection system that directly compensates for positional variations. Instead of mechanically moving the print head to track the conveyed object, the system calculates and adjusts the liquid ejection timing and position based on detected variations, substituting mechanical adjustment with computational control of the ejection process itself
Solution Approach 2:
The system performs self-correction by using the detected positional variations to automatically adjust its own ejection parameters. The control unit calculates the necessary corrections based on sensor feedback and modifies the ejection timing and positioning accordingly, enabling the system to self-correct without external mechanical intervention
2Manufacturing precision
If the print head position is adjusted to correct positional variations, then liquid landing accuracy is improved, but the response time and complexity of the system increase
Solution Approach 1:
The system performs preliminary calculation of the required liquid ejection timing and position based on detected variations. By calculating the necessary corrections in advance using the detected positional data and conveying speed information, the system prepares the corrected ejection parameters before actual ejection occurs, enabling faster response without sacrificing accuracy
Solution Approach 2:
The patent replaces time-consuming mechanical position adjustment with direct computational modification of ejection parameters. The control unit calculates corrected ejection timing based on detected variations and conveying speed, then directly adjusts the ejection process without mechanical intervention, significantly reducing response time
Data Source
AI summary
A liquid ejection apparatus is provided that includes a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object that is being conveyed; a detection unit that is provided with respect to each liquid ejection head unit of the plurality of liquid ejection head units and is configured to output a detection result indicating at least one of a position, a moving speed, and an amount of movement of the conveyed object with respect to a conveying direction of the conveyed object; and a control unit configured to control each liquid ejection head unit of the plurality of liquid ejection head units to eject the liquid based on the detection result.