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An impact printer, dot matrix, fires pins (usually 9 to 24 pins) against an inked ribbon to leave an impression on the paper. Being an impact means that multi-sheets, fan-fold, continuous listing paper (mainly used in offices) can be used with a tractor feed roller to feed the paper through the printer. A tractor feed roller is a roller that has pegs that engage in the holes punched along both edges of the paper.
A non-impact printer, inkjet, laser, thermal, does not come in contact with the paper. An inkjet, for instance, sprays fine jets of ink to form characters or graphics on single-sheet paper. A laser uses heat on a dry resinous toner powder, and static electricity, to put an impression on a rotating drum. Transfer then takes place without impact. A thermal uses heat to burn an impression on treated paper to leave an impression without impact.
Dean Turcotte
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