Epson SQ-2550, User Manual

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Graphics
I n c o m e B r e a k d o w n
The print head
To understand dot graphics you need to know a little about
how
your printer’s print head works.
The printer has a 24-element print head. On the SQ, these
elements are ink nozzles. Electrical impulses cause the nozzles
to transfer ink to the paper to produce a pattern of small dots.
As the head moves across the paper, the nozzles fire time after
time in different patterns to produce letters, numbers, or
symbols.
Because the dots overlap each other both horizontally and
vertically in the Letter Quality mode, it is difficult to see
individual dots. Instead, the letters and symbols seem to be
made of unbroken lines.
In order for the dots to overlap vertically, the nozzles in the
print head are in more than one column, but the intelligence of
the printer handles the timing of nozzle firings so that the effect
is
that
of 24 nozzles arranged in a single vertical column.
4-10 Software and Graphics