printer

printer computer output device that reproduces data on paper or another medium. Impact printers use a mechanical hammering device to produce each character. A formed character printer forces metal or plastic characters against an inked ribbon to produce a sharp image on paper; the characters may be on a moving bar, a rapidly rotating chain, a rotatable ball, or wheel spokes. A dot matrix printer uses a matrix of tiny pegs that, when hit from behind against a ribbon, impart a set of dots to form a character on the paper; a wide variety of characters and graphics is created using different dot combinations. Although noisy, impact printers can produce multiple copies of business forms simultaneously using carbon or carbonless techniques.

Nonimpact printers use thermal and electrostatic, rather than mechanical, techniques. Ink-jet printers, including bubble-jet printers, squirt heated ink through a matrix of holes to form characters or images. Laser printers form an image of the output on a selenium-coated drum using laser light that is turned on and off by data from the computer and then transfer the output from the drum using photocopying techniques. Thermal-wax-transfer printers and dye-sublimation printers use heat to transfer color pigment from a ribbon to a special paper to produce photographic-quality color images. Nonimpact printers are quieter than impact printers and produce higher quality output, especially of graphics, but at a greater cost per page. See also laser printer .

printer An output device that converts the coded information from the processor into a readable or pictorial form on paper or transparent media. There are many types, varying in method, speed, and quality of printing: there are serial printers, line printers, and page printers, and these may be solid-font or matrix printers. Many matrix printers, including laser and inkjet printers, can act as plotters. Printer technology may or may not use mechanical impact to transfer ink (see impact printer, nonimpact printer).

printer printer's devil an errand-boy or junior assistant in a printing office; a devil is a person employed in a subordinate position to work under the direction of or for a particular person.
Printers' Bible an early 18th century edition with the misreading ‘Printers have persecuted me without a cause’ in Psalm 119, ‘printers’ being substituted for ‘princes’.