| 摘要 |
<p>An ink jet printer for depositing drops of ink at a plurality of print positions on a moving print receiving medium (10) includes a print head (12) producing at least one jet drop stream (14) directed toward the medium and a charge electrode (28) positioned adjacent the point of drop formation of the jet drop stream. A charging means (50) repetitively applies a high guard drop pbtential to the charge electrode (28) during formation of at least every second drop for charging-bf the drops to a guard charge level. During formation of the remainder of the drops, either one of a number of relatively low print potentials or a substantially larger catch potential is applied to the charge electrode. Drops formed during application of a print potential to the electrode may carry a charge of either electrical polarity due the drop-to-drop cross talk from previously formed guard drops. Drops carrying a guard charge level and drops carrying a catch charge level are deflected by an electric field to a catcher (30), and drops carrying any of the print charge levels are deflected by the field to associated print positions on the medium (10).</p> |
