From the ink tank, the ink is fed through a pressure pump past
the pressure sensor into the tubus in the print head.
The ink
in the tubus is forced to be modulated with the aid of the piezo
oscillator controlled by the modulation module.
The ink in the tubus breaks down into a stream of separate drops
from a solid state, as it emerges through a fine nozzle. The
ink drops break off when passing through the range of a charge
electrode.
All ink drops pass through the electrostatic field
set up between the two high voltage deflector plates.
The charged drops are deflected in the direction of the electrostatic
field and fly past the gutter tube onto the printing surface.
The uncharged drops, which are not deflected, fly straight
on and are sucked up by the gutter tube.
The return suction pump recycles the ink from the gutter tube
into the ink tank.
This way the inkjet operates according to the continuous inkjet
principle.
By adjusting the height of the pulsed voltage at the charge
electrode, the ink drops are charged at different strengths
and deflected to different degrees in the electrostatic field
set up between the two high voltage deflector plates.
With this technique the inkjet printer can code and mark on
the object surfaces without contact.
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