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Line printers as well as serial dot matrix printers use pins to strike against the inked ribbon, making dots on the paper and forming the desired characters. The differences are that line printers use hammer bank (or print-shuttle) instead of print head, this print-shuttle has hammers , and these hammers are arranged in a horizontal row .The hammer bank uses the same technology as the permanent magnet print head with the small difference that instead of print wires the print-shuttle has hammers. The printing mechanism works as follow. The permanent magnetic field holds the hammer spring in stressed, ready to strike position. The driver sends electrical current to hammer coil, which then creates electromagnetic field opposite to the permanent magnetic field. When both fields equalize, the energy stored in the spring is released to strike the hammer against the ribbon and prints a dot on the paper.

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