Epson SQ-2550, SQ-850 I n c o m e B r e a k d o w n, The print head, 4-10Software and Graphics

Graphics

I n c o m e B r e a k d o w nThe 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