Inkjet Line Head Overlap Alignment Correction

The patent divides the recording head into multiple independent recording heads (first recording head, second recording head, etc.) arranged in a staggered formation. Each recording head has its own nozzle array and can be independently adjusted in the sub scanning direction, allowing individual alignment correction while maintaining the expanded printable width.

The patent introduces adjustable timing parameters (timing advance amounts) for each recording head to correct alignment deviations. By changing the ejection timing of ink from each recording head relative to the sheet conveyance timing, the system compensates for fitting position deviations and achieves precise alignment in the sub scanning direction.

The patent performs preliminary measurement of the actual fitting positions of recording heads during assembly and stores this information. Based on these measurements, the system pre-calculates and sets appropriate timing advance amounts for each recording head before actual printing operations, thereby compensating for fitting deviations without requiring reassembly.

The patent implements a feedback mechanism where the actual printing positions are measured and compared against target positions. The timing advance amounts are then adjusted based on this feedback to minimize alignment deviations, creating a closed-loop system that continuously optimizes printing position accuracy.