Patent ID: 9403359
Filing Date: 2016-08-02
CPC Classification: B41J

Claim Text:
1. A liquid ejection device for ejecting liquid toward a recording medium, the liquid ejection device comprising: a liquid ejection head including a liquid ejection surface formed with a plurality of nozzles, wherein the plurality of nozzles are arranged in a first direction, each of the plurality of nozzles configured to eject liquid; a head moving unit configured to reciprocate the liquid ejection head along a line parallel to the liquid ejection surface and perpendicular to the first direction; a conveyor portion configured to convey the recording medium in the first direction with respect to the liquid ejection head; a corrugate mechanism disposed one of upstream and downstream of the liquid ejection head in the first direction and configured to form the recording medium in a predetermined corrugated shape having a top portion located nearest to the liquid ejection surface in a second direction orthogonal to the first direction and the line parallel to the liquid ejection surface and a bottom portion located farthest from the liquid ejection surface in the second direction, wherein the top portion and the bottom portion are arranged along the line parallel to the liquid ejection surface; and a controller configured to determine an ejection timing for ejecting liquid from ones of the plurality of nozzles appropriate to a corrugated shape formed in the recording medium by the corrugate mechanism while the liquid ejection head is moved along the line parallel to the liquid ejection surface; a memory that stores predetermined ejection timing information related to the ejection timing; and a gap sensor configured to be moved along the line parallel to the liquid ejection surface with the liquid ejection head by the head moving unit and to determine a gap which is a distance between the recording medium and the liquid ejection surface in the second direction, the gap sensor being disposed on one side of the liquid ejection head along the line parallel to the liquid ejection surface, wherein the plurality of nozzles include a first nozzle group and a second nozzle group disposed farther from the corrugate mechanism than the first nozzle group in the first direction, wherein the ejection timing includes a first ejection timing for ejecting liquid from the first nozzle group and a second ejection timing for ejecting liquid from the second nozzle group, and wherein the controller causes the first nozzle group to eject liquid at the first ejection timing and the second nozzle group to eject liquid at the second ejection timing different from the first ejection timing, and wherein the controller is further configured to: