A Printer is a Output Device that accepts text and graphic output from a computer and transfers the information to paper, usually to standard size sheets of paper. This includes text documents, images, or a combination of both. Printers are vary in size, speed, sophistication, and cost.
+ Dot Matrix Printers
+ Inkjet Printers
+ Laser Printers
A printer that uses hammers and a ribbon to form images from dots is called a Dot Matrix Printer. Used to print multipart forms and address labels, the tractor and sprocket mechanism in these devices handles thicker media better than laser and inkjet printers. These printers are generally considered outdated, as they cannot create high-quality prints and are costly as well. A Dot Matrix Printer is also known as an Impact Matrix Printer.
Dot Matrix Printing uses a print head that moves back-and-forth, or in an up-and-down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like the print mechanism on a typewriter. When running the printer, it generally prints one line of text at a time.
An Inkjet Printer is a computer peripheral that produces hard copy of a document by spraying ink onto paper. In the printing mechanism, the print head has several tiny nozzles, also called jets. As the paper moves past the print head, the nozzles spray ink onto it, forming the characters and images. Inkjet Printers are the most popular choice for home printing needs.
In a thermal Inkjet Printer, tiny resistors create heat, and this heat vaporizes ink to create a bubble. As the bubble expands, some of the ink is pushed out of a nozzle onto the paper. When the bubble “pops” (collapses), a vacuum is created. This pulls more ink into the print head from the cartridge.
A Laser Printer is a printer that uses a focused beam or light to transfer text and images onto paper. Some common uses for laser printers include printing company stationery, making labels, and creating company fliers and brochures. The result is a clean copy of the image written on the paper. Because Laser Printers do not use ink, they have less image smearing problems than inkjet printers and are able to print pages faster.
Laser Printer makes a laser beam scan back and forth across a drum inside the printer, building up a pattern of static electricity. The static electricity attracts onto the page a kind of powdered ink called toner. Finally, as in a photocopier, a fuser unit bonds the toner to the paper.
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