Print Inspection Alignment Regions for Conveyance Misalignment

The patent divides the alignment process into two distinct stages: first, a rough alignment using the region outside the sheet to establish initial position relationship; second, a precise alignment using only the pattern region inside the sheet to correct print position misalignment. This segmentation allows each stage to optimize for its specific purpose, resolving the contradiction between operational simplicity and alignment accuracy.

The patent performs preliminary alignment using the region outside the sheet before performing the final precise alignment using the pattern region. This preliminary action establishes an initial alignment state that simplifies the subsequent precise alignment process, allowing the system to achieve both ease of operation and high measurement precision through staged alignment operations.

The patent applies different alignment strategies to different regions: the region outside the sheet is used for rough alignment to establish overall position, while the pattern region inside the sheet is used for precise alignment to correct print position misalignment. This local differentiation ensures that each region contributes its specific strength to the overall alignment process, achieving both robustness and precision.

The patent segments the alignment function into two specialized sub-functions: rough alignment using external region and precise alignment using internal pattern region. This segmentation allows the system to maintain robustness through the rough alignment stage while achieving high precision in the final alignment stage, resolving the contradiction between reliability and measurement precision.