Patent ID: 8899716

Claim:
An ink cartridge comprising: an ink chamber configured to store ink therein; a shaft positioned in the ink chamber; a pivotable member comprising a float; and a first contact portion positioned below the shaft in the ink chamber, wherein the float is configured to move based on an amount of ink stored in the ink chamber, and the pivotable member is configured to move about the shaft between a first position and a second position when the float moves, wherein the float is positioned higher when the pivotable member is in the first position than when the pivotable member is in the second position, wherein the float has a triangular shape when viewed in an axial direction of the shaft, and the triangular shape comprises a first side having a first dimension, a second side having a second dimension, and a third side having a third dimension, wherein the first dimension is greater than each of the second dimension and the third dimension, wherein the first side is positioned above a vertex between the second side and the third side when the pivotable member is in the first position, wherein, when the ink cartridge is in use and the pivotable member is in the first position, the first side extends in parallel with a surface of ink stored in the ink chamber, wherein the pivotable member further comprises a second contact portion, and wherein contact between the first contact portion and the second contact portion keeps the first side extending in parallel with the surface of ink when the ink cartridge is in use and the pivotable member is in the first position.