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An ink jet charge plate is shielded from the high voltage deflection field, and arcs and confines the start-up air flow to render it effective in removing ink from the charge slots after a wet start.
English (United States)
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Ink Jet Charge Plate Shield
An ink jet charge plate is shielded from the high voltage deflection field, and
arcs and confines the start-up air flow to render it effective in removing ink from
the charge slots after a wet start.
In an ink jet head which employs a "wet start" philosophy, it is necessary to
channel the start-up air flow to ensure efficient removal of excess ink from the
charge slots. The ink jet head has means for generating a plurality of ink jet
streams 10 in two spaced arrays, with an ink jet charge plate 12 positioned so
that each ink jet stream passes through a charge slot 14. Ink drops are charged
to a level determined by the voltage on each individual charge slot 14 at the time
the ink drop 16 breaks off from ink stream 18. The ink drop is then deflected
proportionally to the charge as it is passed through a deflection field, produced
by a deflection voltage connected between high voltage plate 20 and gutters 22,
which are maintained at ground potential.
A charge plate shield 24, which is maintained at ground potential, is mounted
between the two charge plates 12 so that a close spacing results between shield
24 and the charge plates. Shield 24 also protrudes beyond the charge plates in
the direction of jet motion. This geometric configuration makes it very improbably
that an arc will occur between the high voltage plate 20 and a charge slot, which
may damage the driver circuit for that charge slot.