Inkjet Printer Ink Discharging Timing Control
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Solution Overview
Problem
Inkjet printers face challenges in maintaining consistent ink droplet placement on wave-shaped recording sheets due to varying gaps between the ink discharging surface and the recording sheet, leading to positional deviations and low-quality prints.
Innovation Solution
An inkjet printer system that adjusts ink discharging timing based on the gap between the ink discharging surface and the wave-shaped recording sheet, using a control device to determine the optimal timing by calculating representative deviation values and applying correction coefficients to ensure accurate ink placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the recording sheet is deformed in a wave shape to improve feeding stability, then the feeding stability is improved, but the gap between the ink discharging surface and the recording sheet varies, causing positional deviation of ink droplets
Solution Approach 1:
The ink discharging timing is made variable rather than fixed. The control device dynamically adjusts the timing based on the detected wave shape characteristics (amplitude, wavelength, phase) of the recording sheet, allowing the system to adapt to the varying gaps caused by wave-shaped deformation while maintaining accurate ink placement
Solution Approach 2:
The system incorporates a feedback mechanism where the wave shape detection unit continuously monitors the recording sheet's deformation, and the control device uses this information to adjust ink discharging timing. This closed-loop control ensures that ink droplets are discharged at the correct moment despite the wave-shaped configuration
2Manufacturing precision
If the ink discharging timing is adjusted for each portion of the wave-shaped recording sheet, then the ink placement precision is improved, but the control complexity increases
Solution Approach 1:
The recording sheet is divided into multiple detection portions along the head moving direction, with each portion having its wave shape characteristics independently detected and processed. This segmentation allows the system to handle the complex wave shape through modular analysis and control adjustments
Data Source
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Figure 3A~3B
AI summary
An inkjet printer is configured to acquire gap variation information related to a variation of a gap between a specific portion of an ink discharging surface and a recording sheet as a function of an inkjet head position, the specific portion located within a usage nozzle disposed area where usage nozzle rows to be actually used are disposed, determine representative gap variation information related to a variation, as a function of the inkjet head position, of a representative gap representing actual gaps between the usage nozzle rows and the recording sheet, by multiplying the gap variation information by a correction coefficient dependent on a width of the usage nozzle disposed area in a head moving direction and a wavelength of a wave shape of the recording sheet, and determine ink discharging timing based on the representative gap variation information, assuming that the actual gaps are equal to the representative gap.