Liquid Discharge Apparatus Orthogonality Control
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Solution Overview
Problem
Conventional inkjet printers with two carriages often experience printing position dislocation and color unevenness due to deviations in the orthogonality between the conveyance direction and the operating direction of the carriages, leading to suboptimal print quality.
Innovation Solution
A liquid discharge apparatus with a controller that calculates and adjusts control parameters to shift the printing position stepwise in the operating direction, ensuring orthogonality between the carriage and the conveyance direction, thereby maintaining parallelism and reducing printing position deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two carriages are used to increase printing speed and productivity, then printing speed and productivity are improved, but printing position dislocation and color unevenness occur due to orthogonality deviations
Solution Approach 1:
The control device calculates a control parameter based on actual conveyance position information and carriage position information to determine the necessary printing position adjustment. This feedback mechanism continuously monitors and corrects position deviations caused by orthogonality errors, maintaining print quality while using multiple carriages for high-speed printing
Solution Approach 2:
The system dynamically adjusts the printing position parameter (control parameter) based on detected orthogonality deviations. By changing the printing position in the main scanning direction according to calculated values, the system compensates for mechanical inaccuracies while maintaining high productivity with two carriages
2Stability of the object's composition
If two carriages operate in opposite directions to compensate inertial forces and reduce vibration, then vibration is reduced, but printing position dislocation occurs due to orthogonality deviations
Solution Approach 1:
The control device uses feedback from position sensors to calculate and apply real-time corrections to printing positions. This allows the system to maintain the vibration-reducing opposite-direction carriage operation while compensating for resulting position deviations through calculated control parameters
Solution Approach 2:
The control parameter acts as a counterweight to orthogonality deviation effects. By applying calculated position shifts in the main scanning direction, the system counteracts the position errors introduced by carriage orthogonality deviations, maintaining print accuracy despite the mechanical configuration
3Adaptability or versatility
If the carriage moves in the main scanning direction while the conveyor moves in the sub-scanning direction, then two-dimensional printing is achieved, but orthogonality deviations cause stepped deviations in the main scanning direction
Solution Approach 1:
The control device continuously calculates control parameters based on feedback from position measurements in both main scanning and sub-scanning directions. This feedback loop detects orthogonality deviations and applies corrective position shifts, maintaining uniformity in the main scanning direction while preserving two-dimensional printing capability
Solution Approach 2:
The system compensates for orthogonality errors by introducing a corrective dimension in the main scanning direction. The control parameter adjusts positions along the main scanning axis to counteract deviations caused by imperfect orthogonality between the carriage and conveyor movement directions
Data Source
AI summary
A liquid discharge apparatus includes: a liquid discharge head configured to discharge a liquid onto a printing medium to form an image on the printing medium; a conveyor configured to convey the printing medium to the liquid discharge head in a conveyance direction; a carriage mounting the liquid discharge head, the carriage configured to move the liquid discharge head in a first direction orthogonal to the conveyance direction; and a controller configured to calculate a control parameter to shift a printing position of the liquid discharge head in at least one of the first direction or the conveyance direction for each time the conveyor conveying the printing medium.