Group 6 Operation – Functional principle Page 63
Release R2.0 LEIBINGER JET3
In order to be able to charge the drops it is necessary for the ink to have electrical
conductivity. This is possible through the use of specific salts that dissociate in the
solvent used. The drop brake-off point of the modulated jet is automatically set in
such a manner that this happens inside the charging electrode.
The drops can now be charged up by creation of voltage between jet and charging
electrode, because they are given a negative charge through the charge shift resulting
in the charge electrode gap. A specific charge voltage is clearly allocated for each
drop charge.
After the drops have left the charging electrode they fly through an electrical field.
Here, those droplets that were previously charged in the charging electrode are
deflected. The drops that have not been charged fly straight ahead into the gutter.
Here they are sucked up and fed back to the circular flow of ink. The charged drops
are only deflected in one direction, the other direction is performed by the product
to be inscribed.
6.2.5 Creation of a character
Each character is defined by a two-dimensional matrix, e.g. 7 x 5. An ink drop can
be assigned to every point of intersection. The character is formed by deflecting the
ink drops in a vertical direction and by moving the product to be imprinted
horizontally. The ink drops not to be positioned on the product will not be charged
by the charging electrode and pass through the electric field without being deflected
directly into the gutter tube. The controller (CPU) of the printer calculates the values
which are required for the generation of charging voltages of the single characters.
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