An ink recovery pipe comprises: an inflow port for receiving ink from an ink reservoir, and disposed at a position close to a first machine frame; and an outflow port for discharging ink into an ink container, and disposed at a position close to a second machine frame. A first restriction device is disposed at a position downstream of the inflow por. A first coupling part is configured to couple a high-pressure air generation part with the ink recovery pipe at a position downstream of the first restriction device. A first high-pressure air control device is configured to stop supply of high-pressure air to the ink recovery pipe, while ink is supplied to the ink reservoir, and supply the high-pressure air to the ink recovery pipe, after start of an ink recovery operation of recovering ink from the ink reservoir after completion of supply of ink.