| 摘要 |
Prior to printing, ink drops are ejected from an ink ejection head or nozzle (28) and an amount of deflection is sweepingly varied until the ink drops hit a target (57), thereby providing a reference which compensates for variations in an amount of charge of the ink drops, a deflection voltage and an ink drop velocity. The ink is caused to fall in drops from a container (48) having a predetermined volume and the number of drops per unit time, corresponding to the ink viscosity, is counted. The temperature of the ink is raised when the number of drops is below a predetermined number and vice-versa.
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