Patent ID: 8038246

Claim:
A liquid ejection apparatus comprising: a feed mechanism that feeds a medium along a predetermined feed direction; a medium support section that supports the medium; an ejection head provided with a plurality of nozzles arranged along the feed direction; a light-emitting member that emits light toward the medium support section; a light-receiving sensor that receives the light emitted by the light emitting member; a moving member that is provided with the ejection head and the light-receiving sensor and that is movable in a main-scanning direction; and a controller that controls ejection of liquid from the nozzles and that detects whether or not the medium is present based on an output value of the light-receiving sensor, wherein the controller causes the nozzles to eject the liquid toward the medium and detects whether or not the medium is present while the moving member is moving in the main-scanning direction, and wherein, in a case where a portion of the medium that is positioned on an upstream side in the feed direction has arrived at a downstream side in the feed direction of a nozzle that is located most upstream in the feed direction and the medium is no longer detected, the controller causes nozzles that are located on the upstream side among nozzles not opposing the medium not to eject the liquid and causes nozzles that are located on the downstream side among the nozzles not opposing the medium to eject the liquid after having fed the medium from the upstream side to the downstream side for a predetermined amount, wherein the medium support section has a protruding section that is formed along the main-scanning direction, and a groove that is formed along the main-scanning direction, wherein the nozzles are divided into nozzle groups including a first nozzle group and a second nozzle group different from the first nozzle group, wherein the first nozzle group keeps opposing the protruding section and does not oppose the groove while the moving member is moving over a full width of the medium along the main-scanning direction, and wherein the second nozzle group does not oppose the protruding section and keeps opposing the groove while the moving member is moving over the full width of the medium along the main-scanning direction.