Liquid Discharging Device Ink Displacement Control
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Solution Overview
Problem
Existing liquid discharging devices, such as printers, face issues with ink displacement due to changes in sheet length caused by ink application, leading to printing inaccuracies on both corrugated and non-corrugated recording sheets.
Innovation Solution
A liquid discharging device with a controller that adjusts discharging timing based on real-time ink amount data, using correction parameters to compensate for sheet length changes, ensuring precise ink placement across the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid is discharged at fixed timing based on deviation amounts from reading printed patch image alone, then initial printing positioning is achieved, but ink displacement occurs in consecutive print areas due to sheet length changes
Solution Approach 1:
The system implements feedback by measuring the actual discharged amount of liquid in each path-printing operation and using this information to calculate correction parameters for subsequent operations. This closed-loop control ensures that ink displacement is compensated in real-time, maintaining alignment accuracy across consecutive print areas while accounting for sheet length changes caused by ink absorption.
Solution Approach 2:
The discharging timing is made dynamic rather than fixed. The system adjusts the discharging timing based on the discharged amount information from previous operations and calculated correction parameters. This dynamic adjustment allows the system to adapt to sheet length changes in real-time, preventing ink displacement in consecutive print areas while maintaining initial positioning accuracy.
2Manufacturing precision
If discharging timing is adjusted dynamically based on discharged amount information, then ink displacement is minimized, but control system complexity increases
Solution Approach 1:
The system performs preliminary actions by obtaining discharged amount information and calculating correction parameters in advance, before executing the next path-printing operation. This proactive approach allows the control system to prepare adjustment values based on previous performance, simplifying the real-time control logic while maintaining high ink placement precision through pre-computed correction values.
Data Source
AI summary
A liquid discharging device, including a liquid discharging head, a carriage, a carriage movement mechanism, a sheet conveyer, and a controller, is provided. The controller conducts a printing process, in which a path-printing operation and a conveying operation are repeated alternately for a plurality of times. The controller calculates discharging timing for the liquid discharging head to discharge the liquid in a path-printing operation, for an upstream area located on an upstream side of a predetermined reference position with regard to a carriage-movable direction, by delaying the discharging timing from a predetermined reference timing; and for a downstream area located on a downstream side of the predetermined reference position, by advancing the discharging timing from the predetermined reference timing to be earlier.