Liquid Jetting Apparatus Ink Distribution Control

The patent divides the sheet into different areas (first area at downstream end, second area upstream) and applies different ink jetting amounts to each area. The controller calculates first and second amounts based on printing data and compares them against threshold values. When the first amount exceeds the first threshold and the second amount exceeds the second threshold, the controller stops conveyance to prevent curvature; otherwise, it maintains normal conveyance speed. This localized quality control approach prevents sheet curvature in critical areas while minimizing unnecessary conveyance stops, thus resolving the contradiction between discharge reliability and discharge time.

The patent implements local quality control by dividing the sheet into a first area (downstream end) and a second area (upstream), and calculating different ink jetting amounts for each area based on printing data. The controller compares the first amount against a first threshold and the second amount against a second threshold. When both exceed their respective thresholds, the controller stops conveyance to prevent curvature; otherwise, it maintains normal operation. This allows high-quality imaging in the first area while preventing sheet curvature through coordinated control of ink distribution and conveyance timing.