Patent ID: 7954936
Filing Date: 2011-06-07
Classification: B41J

Abstract:
1. An ink cartridge comprising: an ink chamber configured to store ink therein, wherein the ink chamber is defined by at least one wall, and an air layer is formed in the ink chamber between a surface of the ink and at least a portion of the at least one wall; and a pump configured to selectively supply air to the air layer and to draw air from the air layer, the pump comprising: a movable member positioned in the inner space and configured to selectively move in the inner space in a first direction such that the air space decreases and in a second direction opposite the first direction such that the air space increases, wherein a portion of the movable member contacts the inner surface of the tube, and the movable member prevents fluid communication between the ink chamber and the atmosphere via the movable member regardless of whether the movable member moves in the first direction or the second direction.