Inkjet recording device

An inkjet recording device, comprising:

• a conveyance unit configured to convey a recording medium in a conveyance direction;
• a carriage configured to reciprocate in a main scanning direction intersecting the conveyance direction;
• a plurality of ink head lines located on the carriage at a position in the conveyance direction;
• and
• a preprocessing head located on the carriage and configured to eject a non-coloring preprocessing solution,
• a postprocessing head located on the carriage and configured to eject a non-coloring post-ejection solution, wherein
• each of the plurality of ink head lines includes a plurality of ink heads, wherein the plurality of ink heads is arranged side by side in the main scanning direction and is configured to eject inks for image formation respectively,
• the postprocessing head is arranged on a downstream side of the plurality of ink head lines in the conveyance direction,
• at least one of the preprocessing head and the postprocessing head is arranged to be partially interposed between a pair of adjacent ink heads in the main scanning direction among the plurality of ink heads included in at least one ink head line among the plurality of ink head lines, and
• the preprocessing head is arranged to satisfy a relationship of Formula 1 in a case where among the plurality of ink heads and the processing head, a head arranged closest to one end in the main scanning direction is defined as a one-end side head, a head arranged closest to another end is defined as an other-end side head, a distance from the one-end side head to the other-end side head in the main scanning direction is defined as LC, and a distance from the one-end side head to the preprocessing head in the main scanning direction is defined as B1,
• the plurality of ink head lines are arranged side by side in the conveyance direction,
• one ink head line among the plurality of ink head lines has one ink head configured to eject ink of a color,
• other ink head line among the plurality of ink head lines has other ink head arranged adjacent to the one ink head and configured to eject the ink of the color, and
• in a case where a distance in the main scanning direction from the one-end side head to the postprocessing head is defined as B2, the preprocessing head and the postprocessing head are arranged to satisfy a relationship of Formula 3,
• |(B1−LC/2)|/LC≤1/4 (Formula 1)
• |(B1+B2−LC)/LC|≤1/2 (Formula 3).