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Shown above is the cross-section of a single nozzle ink jet head. Ink under pressure fills cavity 10 in the head and is emitted out the orifice 12 of nozzle 14. Nozzle 14 is mounted on a block 16.
English (United States)
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Crystal Mount in Ink Jet Head
Shown above is the cross-section of a single nozzle ink jet head. Ink under
pressure fills cavity 10 in the head and is emitted out the orifice 12 of nozzle 14.
Nozzle 14 is mounted on a block 16.
Ink in the ink cavity 10 is perturbed by piezoelectric crystal 18. An elastic ring
20 at the top and front of crystal 18 provides the ink seal for the cavity. The
crystal 18 is held tightly against the seal 20 by an annular button 22. Button 22 is
forced against the crystal 18 by a force pin 24 mounted in a rear mount 26 which
is fastened to the front block 16 of the head. Electrical contact to excite the
crystal 18 is via pin 28, force pin 24 and button 22.
In operation, ink under pressure is emitted out of orifice 12, and because
crystal 18 perturbs the ink in cavity 10, the ink stream breaks into droplets shortly
after it is emitted from orifice 12. In start up and shut down of a continuous flow
ink jet head, It is desirable for the ink cavity 10 to have a constant volume. Since
button 22 is held rigidly in position, the crystal 18 will not move off its seat as ink
pressure changes during start up and shut down. Accordingly, the size of the ink
cavity 10 remains the same during shut down and start up. This helps the ink jet
head turn on and off abruptly and thus reduces the contamination of the head
In addition, the circumferential crystal mount, as described above, should
produce the required perturbations at a lower crystal d...