Patent ID: 8480214

Claim:
A liquid jetting head unit comprising: a head that jets liquid droplets; and a liquid storing tank integrally and directly connected with the head, and provided separately from an external main tank which stores liquid to be supplied to the liquid jetting head unit, the liquid storing tank storing the liquid supplied from the external main tank through a tube to the liquid jetting head unit and supplying the liquid to the head, wherein the head includes a common flow path from which the liquid is supplied to plural liquid chambers connected to plural nozzles that jet the liquid droplets, and the common flow path includes a supply port through which the liquid is supplied into the common flow path and a discharge port through which the liquid is discharged outside, wherein the liquid storing tank integrally and directly connected with the head includes a storage unit that stores the liquid to be supplied to the head, the storage unit being divided into an upstream chamber and a downstream chamber by a filter member, a supply path through which the liquid is supplied to the supply port of the head from the downstream chamber of the storage unit, a discharge path disposed inside of the liquid storing tank, wherein undischarged liquid which flowed through the common flow path and not discharged through the nozzles is returned to the liquid storing tank through the discharge port of the head and then flows through the discharge path and is discharged outside of the liquid jetting head unit, and a first connection path connecting the downstream chamber and the discharge path.