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About Matrix and Virtual Printer.
Dot Matrix Printer is a computer printer that forms images of characters with some small dots.Printhead dot-matrix printer typically contains from 9 to 24 printers needles, which selectively hit the ink ribbon, creating an image on paper, located behind the ribbon. To print to a dot-matrix printer is used, roll or fold-perforated paper. When printing on separate sheets for most dot matrix printers require manual feeding. For automatic feeding of single sheets using the optional document feeder (CSF, Cut Sheet Feeder). Dot matrix printers - the oldest source not specified 247 days from those now used types of printers, its mechanism was invented in 1964 by a corporation Seiko Epson. Dot matrix printers are the first devices, which provided graphical output hard copy.
Produced printers with 9, 12, 14, 18, 24 and 36 needles in the head. Main distribution were 9-and 24-Pin Printers. Print quality and speed of printing graphics depends on the number of needles: needles more - more points. Printers with a 24-name spines called LQ (born Letter Quality - the quality of a typewriter). There are colored dot-matrix printers, which use 4 color CMYK ribbon. Changing colors is a shift tape up and down on the printhead. Print speed matrix printers is measured in CPS (born characters per second - characters per second).
The main disadvantages of dot matrix printers are: monochrome, low speed and high noise level, which reaches 25dB. To address this shortcoming in some models has a quiet mode, but print speed in quiet mode decreases by 2 times, as in this case, each line is printed in two passes using half the number of needles. To combat the noise even apply special sound-proof casings. Some models of dot matrix printers have the opportunity to color printing by using multi-color ink ribbon. However, achieved the quality of color printing is considerably inferior print quality inkjet printer. Dot matrix printers are widely used and is now due to the fact that the cost of such printing is very low, as it uses a cheap fold-over or roll paper. The latter, moreover, can cut pieces of desired length (not one aspect). For many financial instruments requires the fact of the carrier strain from the shock of the press, to exclude the possibility of forgery. Also, dot-matrix printers can be used in cases where the need to get a guaranteed two identical hard copies - for this is to print a few sheets of self-copying paper or through the blueprint - the other common types of printers that are unsuitable because they do not use the pin method.
Produced and high-speed line matrix printers, in which a large number of needles are uniformly located on the shuttle mechanism (frete) across the width of the sheet. The speed of these printers is measured in LPS (born Lines per second - lines per second).
Virtual Printer - a computer program that works and looks to the user as a printer driver, but the actual printer is not connected to it. When the user starts printing the document to a printer, instead of the output on paper or other physical material, the program has processed the received stream of graphics commands, the result of processing is usually written in the file.
Typically, the virtual printer is used for:
convert documents to PDF or PostScript; convert documents into graphics files, such as JPEG or TIFF, for submission to the universal, platform-independent format; sending documents to the server fax. Virtual printer can be used to verify exactly how the document will look when printed.
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