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Classification of printing devices
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The device for obtaining "hard copy" (printout on different types of carriers, mainly paper) texts, images, graphics - in other words, the documents which are initially stored in a digital form.
Complex of mechanical, svetooptichesky and electronic devices for transfer of images of motionless flat objects on channels of telecommunication or for acceptance of such images with reproduction of an object in the form of its copy.
The device intended for obtaining copies of documents, photos, drawings and other two-dimensional images on paper and other materials.
It is intended for automatic drawing of difficult drawings, schemes, maps, etc. on paper of A0 format.
The multi-function printers combining in themselves the scanner, the copier and the printer.
On technologies of printing
The principle of operation of laser printers it is similar to operation of photocopiers. At first on paper the magnetized area to which the printing powder (toner) is attracted is created. Then the sheet of paper gets to "furnace" where powder melts. Afterwards powder is cooled and hardens therefore on a leaf the ready image appears.
Capability of some materials is the cornerstone of this technology to change the electric charge under the influence of light. At printing the drum from light-sensitive medium is irradiated with a flow of light and on it the charged sections corresponding to future image form. Then the toner which sticks to the charged sections is applied on a drum. When rolling paper the toner does not care it is transferred to it, and the ready image is fixed by a warming up and pressure.
The principle of printing at which the print on the carrier forms the ink drops "vystrelivayemy" from nozzles of a printing head. As a rule, the size of ink drops of modern printers is measured by units of picolitres (10-12, one trillionth share of liter), respectively, permission of printing at such method of formation of a print makes thousands of dots per inch.
Technology of transfer of the melted wax ink through openings which diameter is less than thickness of a human hair, from stationary printing heads on the rotating drum from which then the image is transferred to the carrier.
Sublimation printers in the course of formation of a print heating of special tapes therefore color dye is transferred to the carrier is used.
The principle of printing at which the special carrier changing the coloring after heating is used.
See Also
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