Line matrix printer

Line matrix printers can print text, bar codes and graphics.

However, unlike a typewriter or daisy wheel printer, letters are drawn out of a dot matrix, and thus, varied fonts and arbitrary graphics can be produced.

The difference is that a line matrix printer uses a hammer bank (or print-shuttle) instead of print head.

The permanent magnetic field holds the hammer spring in stressed, ready to strike position.

When the two fields equalize, the energy stored in the spring is released to strike the hammer against the ribbon and print a dot on the paper.