Printed Matter Device Adjusting ON Dot Levels for Uniform Print Quality
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Solution Overview
Problem
Conventional printed matter creating devices produce noticeably darker redundantly printed areas when resuming printing after an interruption, especially when printing images or patterns, due to uncorrected darkness levels in overlapped print areas.
Innovation Solution
A printed matter creating device with a controller that adjusts the ON dot levels in the acquired print data to correct the darkness level in the overlapped area, including adjusting the proximity of dots in the junction print, to prevent the formation of white lines and maintain the appearance quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the printing head redundantly prints the line that was printed just prior to interruption while feeding remains halted, then print omission is prevented, but the redundantly printed area becomes noticeably darker
Solution Approach 1:
The patent changes the printing parameters (ON dot proximity, dot size, or print density) in the connecting part where prints overlap. By adjusting these parameters, the darkness level of the overlapped area is controlled to match the surrounding areas, preventing the visually noticeable dark regions while maintaining print completeness.
Solution Approach 2:
The patent applies different printing qualities to different regions of the print. Specifically, the connecting part (where interruption occurred and redundancy printing is needed) receives adjusted printing parameters compared to the rest of the print area. This local adjustment ensures that the overlapped region does not stand out as darker, while other areas maintain normal printing characteristics.
2Productivity
If the printing head prints images or patterns without ON dot adjustment, then printing speed is maintained, but white lines appear in the connecting part
Solution Approach 1:
The patent performs preliminary adjustment of ON dot parameters in the print data before the actual printing process. By pre-calculating and adjusting the dot proximity, size, or density in the connecting part, the system prevents white line formation without requiring additional printing passes, thus maintaining printing speed while improving appearance quality.
Solution Approach 2:
The patent modifies the ON dot parameters (proximity, size, density) specifically in the connecting part of the print data. This parameter adjustment ensures that when the printing head redundantly prints the connecting area, the dots properly overlap to fill gaps and prevent white lines, while the rest of the print maintains normal parameters for efficient printing.
Data Source
AI summary
A printed matter creating device includes a controller configured to: acquire print data; form a first print on a printing medium while conveying the printing medium, the first print being based on first ON dots in the acquired print data; interrupt the conveyance of the printing medium after forming the first print; cut the printing medium after interrupting the conveyance; and form a second print on the printing medium while conveying the printing medium after cutting the printing medium, the second print being based on second ON dots in the acquired print data. The print data includes a specific print data corresponding to a connecting part connecting the first print and the second print. Based on the acquired print data, the controller adjusts at least one of: aspects of the first ON dots in the specific print data; and aspects of the second ON dots in the specific print data.