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REV.-A
<
Printing>
The basic principles of how printing works for a single nozzle is described
next.
(1) Ordinary situation. The piezoelectric element is electrically charged and distorted.
/ Piezoelectric Element
E_~
__ ' / _ : :
_
Figure 2-60. Printing Principle (1)
(2) Charging. Prior to injection, the piezoelectric element makes a gradual electric discharge to expand
the pressure chamber and allow ink to flow into the pressure chamber.
/
Pressure Chamber
E"'~"'--
I
Figure 2-61. Printing Principle (2)
(3) Discharging. Ink injection is carried out by distortion of the piezoelectric element as it is rapidly
charged.
Figure 2-62. Printing Principle (3)
In short, printing occurs only when the piezoelectric element is distorted or expanded. Suction and
injection of ink during initial ink charging and cleaning requires operation of the pump to such ink from
the head.
2-55
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