in der EDV ein Ausgabegerät für Daten. Man unterscheidet zwischen D. mit festen Drucktypen (Typenrad-, Ketten-D.), Matrix-D., die die Zeichen aus einzelnen Punkten zusammensetzen (Nadel-, Tintenstrahl-, Thermo-D.), und Laser-D., die mit einer negativ geladenen photoelektr. Trommel arbeiten und ähnl. dem Fotokopieren das Schriftbild entwickeln.
Sinonimi: line-at-a-time printer
Any printer that prints one line at a time as opposed to one character at a time (as with many dot-matrix printers) or one page at a time (as with some dot-matrix and most laser printers). Line printers typically produce the familiar 11-by-17-inch fanfold “computer” printouts. They are high-speed devices and are often used with mainframes, minicomputers, or networked machines rather than with single-user systems.
An output device on a computer that prints a whole line of characters at a time; SYN. line-at-a-time printer.
Computer printer that prints a complete line of characters at a time. Line printers can achieve very high printing speeds of up to 2,500 lines a minute, but can print in only one typeface, cannot print graphics, and are very noisy. Until the late 1980s they were the obvious choice for high-volume printing, but high-speed page printers, such as laser printers, are now preferred.
Sinonimi: pressman | printing machine
A computer peripheral that puts text or a computer-generated image on paper or on another medium, such as a transparency film. Printers can be categorized in any of several ways: impact versus nonimpact; print technology; character formation; method of transmission; method of printing; print capability; and print quality.
Impact versus nonimpact The most common distinction is impact versus nonimpact. Impact printers physically strike the paper and are exemplified by pin dot-matrix printers and daisy-wheel printers; nonimpact printers include every other type of print mechanism, including laser, ink-jet, and thermal printers.
Print technology Chief among types of print technology are pin dot-matrix, ink-jet, laser, thermal, and (although somewhat outdated) daisy-wheel or thimble printers. Pin dot-matrix printers can be further classified by the number of pins in the print head: 9, 18, 24, and so on.
Character formation Fully formed characters made of continuous lines (such as those produced by a daisy-wheel printer) versus dot-matrix characters composed of patterns of dots (such as those produced by standard dot-matrix, ink-jet, and thermal printers). Laser printers, while technically dot-matrix are generally considered to produce fully formed characters because their output is very clear and the dots are extremely small and closely spaced.
Method of transmission Parallel (byte-by-byte transmission) versus serial (bit-by-bit transmission). These categories refer to the means by which output is sent to the printer rather than to any mechanical distinctions. Many printers are available in either parallel or serial versions, and still other printers offer both choices, yielding greater flexibility in installation options.
Method of printing Character by character, line by line, or page by page. Character printers include standard dot-matrix, ink-jet, thermal, and daisy-wheel printers. Line printers include the band, chain, and drum printers that are commonly associated with large computer installations or networks. Page printers include the electrophotographic printers, such as laser printers.
Print capability Text-only versus text-and-graphics. Text-only printers, including most daisy-wheel and thimble printers, and some dot-matrix and laser printers, can reproduce only characters for which they have matching patterns, such as embossed type or internal character maps. Text-and-graphics printers—dot matrix, ink-jet, laser, and others— can reproduce all manner of images by each as a pattern of dots.
Print quality Draft versus near-letter quality versus letter quality.
1. Someone whose occupation is printing; SYN. pressman.
2. A machine that prints; SYN. printing machine.
3. (Computer science) An output device that prints the results of data processing.
In computing, an output device for producing printed copies of text or graphics. Types include the daisywheel printer, which produces good-quality text but no graphics; the dot matrix printer, which produces text and graphics by printing a pattern of small dots; the ink-jet printer, which creates text and graphics by spraying a fine jet of quick-drying ink onto the paper; and the laser printer, which uses electrostatic technology very similar to that used by a photocopier to produce high-quality text and graphics.
Printers may be classified as impact printers (such as daisywheel and dot-matrix printers), which form characters by striking an inked ribbon against the paper, and nonimpact printers (such as ink-jet and laser printers), which use a variety of techniques to produce characters without physical impact on the paper.
A further classification is based on the basic unit of printing, and categorizes printers as character printers, line printers, or page printers, according to whether they print one character, one line, or a complete page at a time.
A key for raising or drawing back a latch (especially on an outside door).