| 摘要 |
A fluid jet printer is disclosed having a print head which generates a plurality of jet drop streams, and a drop charging means including a notched charge electrode plate in which a plurality of charge electrodes are defined by electrically conducted coatings within notches spaced along one edge of the plate. A mounting means pivotally supports the charging means such that the charge electrode plate may be pivoted between an operating position in which each charge electrode partially surrounds a corresponding one of the fluid filaments emerging from the print head, and a retracted position in which the charge electrodes are retracted from the fluid filaments. The charge electrode plate is pivoted into its operating position after start-up of the print head means and, further, is pivoted into its retracted position prior to shutdown of the print head means. By this technique, fluid contamination of the charging means by jet drops which are generated unstably at start-up and shutdown is prevented.
|
