US Patent 11590755 Liquid ejection device

A liquid ejection device includes a first head unit that includes a plurality of first ejection portions, a second head unit that includes a plurality of second ejection portions, a head controller that controls the first head unit and the second head unit, and a signal path via which determination information indicating whether or not a liquid ejection state of one first ejection portion among the plurality of first ejection portions is abnormal is transmitted from the first head unit to the second head unit without passing through the head controller.