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Card thermal printer fades1/1/2023 ![]() These printers are very quiet in action, though not silent, are reasonably inexpensive, and have the big advantage that they are able to print in full colour. The head of an inkjet printer works by squirting microscopic drops of ink at the paper as it scans across the sheet. Under computer control, they can be made to print in a wide range of fonts and can also be programmed to print simple graphic designs.Īt one time, dot-matrix printers were the commonest kind of printer used in offices, but more recently they have been replaced by the inkjet printers. Their main disadvantage is that they are very noisy. ![]() They can print on almost any paper, and on separate sheets, though continuous perforated paper edged with sprocket holes is commonly used. Dot matrix printers are usually limited to printing in black. Then the paper is moved on to print the next line. The head scans across the paper, printing a row of characters. As the head travels along a horizontal track, the needles impact an inked ribbon, causing the paper behind the ribbon to be marked. A coil surrounds the base of each needle and the needle is propelled toward the paper when the coil is energized. The head of a dot-matrix printer consists of a vertical row of nine fine needles. Their main disadvantage is that the printing fades with time and may be obliterated by excessive heat. They are often used in supermarkets and shops for printing out the bill. They are often small, printing out on paper tape a few centimetres wide. Thermal printers are inexpensive and silent in operation. By turning appropriate elements on or off as the paper passes the head, the computer can print characters and designs. The paper has a special coating that turns dark grey when it is heated. ![]() Thermal printers have a head that consists of a row of tiny heating elements. Owen Bishop, in Understand Electronics (Second Edition), 2001 Printers ![]()
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