Printhead Mechanism - Epson SQ-1170 Service Manual

2.1.1 Printhead Mechanism

The printhead of this printer employs the on-demand method, where part of the ink stored in the reservoir
within the printhead is supplied into the nozzle each time ink in the nozzle chamber is injected.
Figure 2-2 shows the internal structure of the printhead. The functions of the major components are
explained below.
Head damper
When the carriage moves, the ink tube also moves, which results in the change of pressure within the
tube. The head damper is used to absorb this change of pressure and prevent the ink from rushing into
the reservoir.
Reservoir
The ink supplied into the printhead is once stored in the reservoir.
The ink stored in the reservoir is injected through nozzles. The structure of a nozzle is shown in Figure '~~~
2-3.
—
\
Nozzle
I
1 \-,/'
\
\ \
1
Figure 2-2. Internal Structure of Printhead
Figure 2-3. Structure of a Nozzle
2-2
Ink Inflow Gate
- - - - - - ' . \
I
I
— — — — . -
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Diaphragm
Element
Pressure
Chamber
-Damper