Patent ID: 8777400

Claim:
A liquid ejection device comprising: a transport unit configured and arranged to transport an ejection medium; a medium support unit arranged on a downstream side of the transport unit with respect to a transport direction of the ejection medium, and having a medium support surface on which the ejection medium is supported by suction using negative pressure when the transport unit transports the ejection medium; and a liquid ejection head configured and arranged to eject liquid on the ejection medium supported on the medium support unit, the medium support unit including a plurality of first recesses and a plurality of second recesses arranged on the medium support surface along a width direction orthogonal to the transport direction, the first recesses and the second recesses being configured and arranged to be imparted with the negative pressure, each of the first recesses having at least a first upstream side wall edge and a downstream side wall edge that define a first opening of each of the first recesses, the first upstream side wall edge being arranged at an upstream end of each of the first recesses with respect to the transport direction, the downstream side wall edge being arranged at a downstream end of each of the first recesses with respect to the transport direction, the second recesses being configured and arranged to accept the liquid ejected toward the ejection medium from the liquid ejection head, each of the second recesses having at least a first side wall edge and a second side wall edge that define a second opening of each of the second recesses and extend along the transport direction, wherein, in the first recesses, a width dimension of the downstream side wall edge of each of the first recesses in the width direction is larger than a width dimension of the upstream side wall edge of each of the first recesses in the width direction, and a width length between the first side wall edge and the second side wall edge of each of the second recesses in the width direction is smaller than the width dimension of the downstream side wall edge of each of the first recesses in the width direction.