WordNet (r) 3.0 (2006):

impact printer
    n 1: a printer that prints by mechanical impacts

The Free On-line Dictionary of Computing (30 December 2018):

impact printer

    The earlier, noisier kind of printer where part of
   the mechanism comes into contact with the paper.  The term
   would only be only used in contrast to "non-impact printer".
   Examples include line printer, daisy wheel printer, golf
   ball printer, dot matrix printer, Braille printer.

   (1998-10-13)