Inkjet printing device

摘要

An inkjet printing device allows separation of ink solvent liquefied in an exhaust passage from exhaust gas, and prevents the separated exhaust gas from contaminating the inside of the print head. When ink fed from a container is jetted from a printing nozzle, ink that has not been used for the printing is drawn by a gutter along with air and collected in the container. Air mixed with the ink solvent and collected is discharged as exhaust gas into an exhaust passage from the container. The ink solvent that has been liquefied in the exhaust passage is separated from the gas by retaining the liquid using capillary action in a gas-liquid separator, and the separated liquefied ink solvent is collected. The trace amount of the ink solvent leaking on the exhaust side of the gas-liquid separator is prevented from dripping into the print head by a drip prevention unit.

主权项

1. An inkjet printing device comprising:
an ink container which stores ink; a nozzle which jets the ink for printing on a printing object; a feed pump for feeding the ink from the ink container to the nozzle through an ink supply passage; a gutter which draws the ink jetted from the nozzle and unused for the printing along with air; a print head which stores the nozzle and the gutter; a first collection pump which sends the ink drawn by the gutter along with air to the ink container for collection through an ink collection passage; an exhaust passage which discharges the air as exhaust gas from the ink container, which has been mixed with an ink solvent and collected into the ink container; a gas-liquid separator for separating the exhaust gas from liquefied ink solvent formed by liquefaction of the ink solvent contained in the exhaust gas in the exhaust passage using capillary action; a second collection pump which sends the liquefied ink solvent separated by the gas-liquid separator for collection into the ink container through an ink separation-collection passage; and a drip prevention unit provided at a rear stage where the exhaust air is discharged from the gas-liquid separator.