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The term dot matrix printer is used for impact printers that use a matrix of small pins to transfer ink to the page. [17] The advantage of dot matrix over other impact printers is that they can produce graphical images in addition to text; however the text is generally of poorer quality than impact printers that use letterforms (type).
Some types of impact line printers are drum printers, band-printers, and chain printers. Non-impact technologies have also been used, e.g., thermal line printers were popular in the 1970s and 1980s, [ 3 ] some inkjet and laser printers produce output a line or a page at a time.
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Dot matrix printers create noise when the pins or typeface strike the ribbon to the paper, [28] and sound-damping enclosures may have to be used in quiet environments. They can only print lower-resolution graphics, with limited color performance, limited quality, and lower speeds compared to non-impact printers. [29] [30] [31]
The term Printing Press refers to the nature of the process, in which there is contact between the system that applies the ink to the substrate and substrate that the ink is pressed onto. Digital Printers however are non-impact printing processes; to print, a devices “fires” drops of ink from the print heads onto the substrate.
The offset process employs a flat (planographic) image carrier (plate) which is mounted on a press cylinder. The image to be printed obtains ink from ink rollers, while the non-printing area attracts an (acidic) film of water, keeping the non-image areas ink-free. Most offset presses use three cylinders: Plate, blanket, impression.
A letter-quality printer was a form of computer impact printer that was able to print with the quality typically expected from a business typewriter such as an IBM Selectric. A letter-quality printer operates in much the same fashion as a typewriter. A metal or plastic printwheel embossed with letters, numbers, or symbols strikes an inked ...