Dot matrix printer
A dot matrix printer prints a plurality of dots which, when viewed together, form an overall image. In a dot-matrix printer, characters are printed by forming dots on a recording medium, in a dot-matrix pattern, such that columns of dots each of which consists of a suitable number of dots and extends in a given direction are arranged at a predetermined printing pitc in a printing direction which intersects the direction of extension of the columns of dots. Dot matrix printers commonly employ a printhead with a plurality of individual printing elements arranged in an array extending across the rectilinear path of the printhead relative to a recording medium. The print head usually consists of a vertically oriented column of seven or eight print wires, each of which may be selectively extended (or fired) as the print head traverses each horizontal line (or print line) of the web. The dot forming elements are located along a line that lies orthogonal to the direction of paper movement through the printer. Since paper movement is normally vertical, the dot forming elements usually lie along a horizontal line. A dot printer may be classified into an impact printer and a non-impact printer, most of which employ the serial printing system in which the printing is serially carried out from end to end of the recording paper. The serial printing system has an advantage that printing cost per unit length on the recording paper is low, if printing width is comparatively long. Dot matrix serial printers are easily adapted to print characters, figures and the like with a plurality of dot patterns. Due to the great degree of flexibility inherent in dot matrix type serial printers in expressing a wide variety of dot patterns, dot matrix type serial printers are widely used as printing output devices of computers. Dot-matrix printers are available in several different types, including wire or pin impact printers, thermal printers, ink jet printers, and printers which use special laser diode arrays to write images onto a photosensitive member.
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