Patent ID: 8727465

Claim:
A method for supplying a liquid from a liquid tank to a head tank fixed to a liquid-jet head utilizing a liquid supply device in a liquid-jet apparatus, the method comprising: (a) jetting liquid droplets from the liquid-jet head while maintaining a meniscus pressure of the liquid-jet head within a predetermined range; (b) detecting the meniscus pressure of the liquid-jet head; (c) carrying out, when the detected meniscus pressure is lower than the predetermined range, a first liquid supply operation such that the detected meniscus pressure of the liquid-jet head being lower than the predetermined range is restored to the predetermined range, the first liquid supply operation including (c1) supplying a predetermined amount of ink from the liquid tank to the head tank while (c2) a detector detects a supply amount; and (d) carrying out, while the first liquid supply operation is not being carried out, a second liquid supply operation such that the liquid is supplied to the head tank in an amount less than a liquid-jetted amount computed based on a liquid-jet signal, the second liquid supply operation including (d1) supplying a predetermined amount of ink from the liquid tank to the head tank (d2) without detecting the supply amount in the second liquid supply operation.