| 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 temperature or an ejection pump pressure are sweepingly varied, prior to the deflection sweep operation, until a sensed ink ejection velocity and thereby ink drop mass become equal to a predetermined value to provide a desired printing density or darkness.
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