Patent ID: 8182060

Claim:
An ink supply device comprising: an ink cartridge comprising: an ink chamber configured to store ink therein; and a movable member configured to move according to an amount of ink stored in the ink chamber; and a cartridge mounting portion to which the ink cartridge is mounted by being inserted thereinto in an insertion direction, wherein the cartridge mounting portion comprises: a first detector configured to detect the movable member positioned in a movable range of the movable member when the ink cartridge is in a mounted state in which the ink cartridge is mounted to the cartridge mounting portion; and a second detector configured to detect the movable member positioned in the movable range of the movable member when the ink cartridge is in the mounted state, wherein the second detector is shifted from the first detector in a first direction which intersects the insertion direction; and a determiner configured to execute an ink amount determination process in which the amount of ink stored in the ink chamber is determined, based on a fact that the movable member of the ink cartridge in the mounted state is detected by at least one of the first detector and the second detector, wherein the ink cartridge further comprises: a first detectable portion configured to be detectable by the first detector; and a second detectable portion configured to be detectable by the second detector and shifted from the first detectable portion in the first direction; wherein the determiner is configured to execute a first determination process in which it is determined whether or not the second detector detects the second detectable portion when the first detector initially detects the first detectable portion during an insertion of the ink cartridge into the cartridge mounting portion, and the determiner is configured to execute a second determination process in which it is determined whether or not the second detector detects the second detectable portion when the first detector stops detecting the first detectable portion during the insertion of the ink cartridge into the cartridge mounting portion.