Patent ID: 9682570
Date: 2017-06-20
CPC Classifications: B41J

Claim:
1. A liquid supply device comprising: an ink passage that allows an ink jet head, which ejects ink from nozzles, to communicate with an ink tank in which ink is stored; a pump that is provided on the ink passage and applies pressure to ink present in the ink passage; a back-pressure tank that is provided between the ink jet head and the pump and includes a liquid chamber communicating with the ink passage through a flow port, a gas chamber in which gas is stored, and an elastic diaphragm isolating the liquid chamber from the gas chamber; and a restriction member that is disposed in the flow port on an extension surface of an inner wall surface of the liquid chamber and keeps the elastic diaphragm on an inside of the extension surface in a case in which the elastic diaphragm is sucked into the flow port by the pressure that is applied to the ink by the pump, wherein the restriction member divides the flow port into a plurality of regions.