To largely shorten a time for recovery of ink and cleaning water with a simple structure and to save ink.

This device forcibly sucks so as not to retain ink and cleaning water in an ink reservoir. As its sucking means, an air ejector 23 for injecting the compressed air to suck it into the reservoir 30 with its accompanying flow to vacuum is used, the injection of the air is controlled by switching a solenoid valve 26, thereby facilitating intermittent suctions.