Patent ID: 9616673
Date: 2017-04-11
CPC Classifications: B41J

Claim:
1. A liquid jet unit comprising: a circulation path through which liquid is circulated; a liquid jet head including an inflow port and an outflow port, a flow path disposed between the inflow port and the outflow port and forming a part of the circulation path, and a nozzle communicating with the flow path and being configured to eject liquid from the liquid jet head; a liquid pump arranged in the circulation path and configured to circulate liquid in the circulation path; a tank for storing liquid, the tank being located below the nozzle in a gravity direction and being connected via a supply path to the liquid pump, the supply path having no pump and being connected at one end to the tank and connected at another end to the circulation path at a connection point between the outflow port and the liquid pump to supply liquid to the circulation path, and the circulation path having no pump in the part of the circulation path between the outflow port and the connection point; and a pressure sensor configured to detect the pressure of liquid in the circulation path and generate pressure information, the liquid pump being configured to change an amount of liquid to be fed on the basis of the pressure information generated to maintain liquid in the nozzle at a predetermined pressure and draw liquid into the circulation path from the supply path.