Leibinger JET3 up, Руководство по эксплуатации

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Group 8 Job Editor Page 69
JET3up Release R1.06
6.2.3 Drop charging
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.
6.2.4 Drop deflection
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.