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Dot Matrix Printers

Dot Matrix Printers. Marwa Mussadiq Khan 9-silver . Introduction…….

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Dot Matrix Printers

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  1. Dot Matrix Printers MarwaMussadiq Khan 9-silver

  2. Introduction……. • Dot matrix printing or impact matrix printing is a type of computer printing which uses a print head that runs back and forth, or in an up and down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like the print mechanism on a typewriter. 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.

  3. Design….. • Each dot is produced by a tiny metal rod, also called a "wire" or "pin", which is driven forward by the power of a tiny electromagnet or solenoid, either directly or through small levers (pawls). Facing the ribbon and the paper is a small guide plate pierced with holes to serve as guides for the pins. This plate may be made of hard plastic or an artificial jewel such as sapphire or ruby. The moving portion of the printer is called the print head, and when running the printer generally prints one line of text at a time. Most dot matrix printers have a single vertical line of dot-making equipment on their print heads; others have a few interleaved rows in order to improve dot density. Because the printing involves mechanical pressure, these printers can create carbon copies and carbonless copies. Its speed of printing varies from 50 to 500 cps.

  4. Advantages & Disadvantages ADVANTAGES: • low purchase cost. • can handle multipart forms. • cheap to operate, just new ribbons. • rugged and low repair cost. DISADVANTAGES: • noisy. • low resolution. You can see the dots making up each character. • Not all can do colour. • Colour looks faded and streaky. • Rate This Answer

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