Impact printers press formed character faces against an inked ribbon on to the paper. A line printer is an example of an impact device with the type faces mounted on bands, chains, drums or wheels.
Non impact printers use laser techniques, inkjet sprays, xerographic processes or electrostatic or electro-thermal methods to get images on the paper.
Character impact printers often have a dot matrix print head containing a rectangular array of protruding wire pins with the number of pins depending on the quality of the printer. Individual characters or graphics patterns are obtained by retracting certain pins so that the retracting pins from the pattern to be printed. Graphic applications use generally non impact printers with different color toners.
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