| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a liquid discharge unit capable of more securely discharging foreign matter, an air bubble, etc., mixed in a liquid flow passage of a liquid discharge head.SOLUTION: A switching unit 27 switches a state of an ink supply part 6 between a first state in which printing ink Ia of a first supply part 21 is discharged to an ink jet head 3 and a second state in which thickened ink Ib of a second supply part 22 is supplied to the ink jet head 3. When the ink supply part 6 is in the second state, the thickened ink Ib is pressurized and sent to the ink jet head 3 by a second purge pump 26 so as to discharge the thickened ink Ib from a plurality of nozzles 10 of the ink jet head 3.</p> |
