| 摘要 |
PROBLEM TO BE SOLVED: To prevent clogging of an ink jet port nozzle by a method wherein residual ink at an ink jet port is washed off by a small quantity of solvent on the occasion when jetting of ink from the nozzle is stopped. SOLUTION: Ink 41 is filled beforehand in an ink vessel 39 and the ink 41, an ink supply pump 35, a solenoid valve 32 for controlling ink jet, a switching control valve 24 and a nozzle 1 are connected by ink jet tubes 23a and 23b. Besides, a gutter 30 for recovering ink particles 22, a recovery pump 37 and the ink vessel 39 are connected by an ink recovery tube 43. A solvent 42 is filled beforehand in a solvent vessel 38 and the solvent 42, a solvent supply pump 34, a solenoid valve 31 for controlling the solvent and the switching control valve 24 are connected by a solvent tube 21. The nozzle and a circulation check valve 26, and the circulation check valve 26, a solenoid valve 33 for controlling circulation and a circulating pump 36, are connected by circulation tubes 25a and 25b respectively and make up a circulation passage. According to this constitution, an operation for maintenance is dispensed with on the occasion when jetting of ink is restarted after it is not conducted long. |
