Patent ID: 8029115
Filing Date: 2011-10-04
Classification: B41J

Abstract:
1. A liquid ejection device comprising: a main tank mounting unit to which a main tank capable of storing liquid is removably mountable; a sub tank comprising: an ejection head having a nozzle configured to eject the liquid supplied from the sub tank via the outlet; a remaining amount detecting unit configured to detect whether an amount of the liquid in the main tank is equal to or smaller than a predetermined liquid amount, where a liquid level of the liquid in the main tank at the predetermined liquid amount is positioned at a threshold level; and a remaining amount calculating unit configured to determine a liquid amount ejected from the ejection head during a term starting from a detection of the threshold level by the remaining amount detecting unit, thereby calculating a remaining liquid amount in the main tank; wherein the sub tank is configured to satisfy the following formula: S S M M wherein the main tank mounted to the main tank mounting unit is disposed adjacent to the sub tank in a horizontal direction, and the liquid level in the main tank is equalized to the liquid level in the sub tank by the hydraulic head pressure of the liquid in the main tank and the sub tank when the main tank in a fully filled state is mounted to the main tank mounting unit.