Patent ID: 8235495

Claim:
A printer comprising: a print head including an ink propelling mechanism; an ink tank configured to supply ink to the print head; an ink circulation route including the print head and the ink tank therein; an ink circulator adapted to circulate ink through the ink circulation route; a first temperature sensor adapted to measure a temperature of ink flowing in a route between the print head and the ink tank in the ink circulation route; a heater disposed in a vicinity of the ink tank to heat ink; and a controller configured to work with a received print job, operating for temperatures of ink as measures at the first temperature sensor lower than a first prescribed reference, to heat ink by the heater without starting printing, and for temperatures of ink as measures at the first temperature sensor kept equal to or higher than the first reference for a prescribed time interval, to start printing, wherein the prescribed time interval is defined based on: a distance between the first temperature sensor and the print head; a cross-sectional area of the route between the print head and the ink tank; and an ink circulation amount per unit time in the route between the print head and the ink tank.