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Impact Printer
                  Impact printer prints the contents by striking the printer head or needle on an ink ribbon which rolls
                  through the cartridge to make a mark on the paper.

                  Impact Printer can be classified into:
                  l    Line Printer: A line printer prints the content line by line. The printing speed of Line Printers varies
                       from 300 to 3000 lines per minute. Generally, a line printer is used because of its greater printing
                       capacity and higher speed than serial printers. It can be further divided into two types, i.e., Drum
                       Printer and Chain Printer.

                  l    Character Printer: A character  printer is also known  as a  serial printer. It prints the contents
                       character by character, i.e., it prints a character at a time in serial order. It can be further divided into
                       Daisy Wheel Printer, Dot Matrix Printer, etc.

                            Daisy Wheel Printer:  A  daisy  wheel  printer  is  a  specific  type
                       n
                            of  mechanical  impact  printer  that  uses a  metal  or  plastic  disk
                            containing each of the letters, numbers, and other characters it
                            supports.
                             To print a character, the printer rotates the disk until the desired
                            letter is facing the paper. Then a hammer strikes the disk, forcing the character to hit an ink
                            ribbon, leaving an impression of the character on the paper.

                            Dot Matrix Printer: Dot Matrix Printer is the most commonly
                       n
                            used printer. It is also known as the Wire Matrix printer. In this
                            printer, head contains a matrix of pins. The characters are printed
                            by the dots which are formed by striking the pins on the ribbon,
                            with the help of small printer head which moves to and fro across
                            the page,  it stops momentarily at each character position to
                            strike the print ribbon.
                             A print head of a dot matrix printer contains 9 to 24 pins. Dot matrix printer is cheaper and has
                            low printing cost than any other printers. The width of a dot matrix printer can be 80, 132 or 136
                            columns. Dot matrix printer can print upto 100 to 300 characters in a second. The resolution of
                            the printing ranges from 150 to 300 dots per inch (dpi).

                  Non-Impact Printer

                  Non-Impact printer prints the output without touching or striking the ribbon on paper or on the film. This
                  kind of printer prints by using thermal, chemical, electrostatic, laser beam or inkjet technology. Usually
                  non-impact printer has a greater resolution and is faster as compared to impact printer. Non-impact
                  printer can print colourful content also. This printer can be classified into:
                                                 l      Inkjet Printer: An inkjet printer produces high quality print outputs
                                                      by spraying  drops of ink (which  is stored in coloured and black
                                                      cartridges). This printer has a print head which contains the cartridge
                                                      with  several  tiny  holes through  which  the  ink is sprayed  on  the
                                                      paper.





                   20    Touchpad Computer Applications (Ver. 2.0)-IX
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