Printer
Printers are a type of output device. It is used by the computer to print the received data and information on a paper. Can print black and white as well as color document. The speed of a printer is measured in Character Per Second - CPS , Line Per Minute - LPM , and Pages per minute ( Pages - Minute - PPM ). The quality of a printer is measured in Dots Per Inch - DPI.
Types Of Printer
The printer is divided into two parts
- Impact Printer
- Non - Impact Printer
Impact Printer
This printer works like a typewriter. In this there are small pins or hammers to print letters. As soon as the letters are made on these pins, the pins are printed with ink on the ribbon and then on the paper, due to which the letters are printed on the paper. Impact Printer can print one character or one line at a time. Those printers are cheaper than other printers and make more noise during printing, so their use is less.
Types of Impact printers
■ Dot Matrix Printer
■ Solid Font Printer
□ Dot Matrix Printers
One of the pins in STC matrix printer There is a line, which strikes the ribbon on the upper Matrix end of the paper. When the pin strikes the ribbon, a group of dots form a It falls on the paper in the form of metrics, from which letters or pictures are printed, this type of printer is also called pin printer. Dot matrix printer prints only one character at a time.
Dot Matrix Printer Dot Matrix Printer is the most popular of the serial printers. In the print head of this type of printers, matrices of 9x7 pins are given, with the help of which letters are formed. In this, one letter at a time is sent to the computer's memory, which the printer prints. The printer selects the pins present in the head for that particular letter on the basis of the pattern of each letter saved in its memory. A carbon is placed between the pin and the paper. When those pins hit the paper, that letter gets printed. Presently there are also 24 pin printers available, which are more efficient. The more the number of pins, the more attractive the printing is. They are capable of printing from 80 characters per second to 1500 characters per second. They can print in any language. In these letters, there is no fixed size (font). With their help, it is also easy to print in Devanagari script of Hindi. With its help, graphs and charts can also be made easily. While printing, its prints can be printed from left to right and from right to left i.e. from both sides, due to which its print speed is fast. Their use is the most and their printing cost is very low.
□ Solid Font Printer
Sold Font Pinter There is a whole set of letters to be printed in this type of printer. These letters are embossed on an iron head (as in a typewriter). This head prints the letter by hitting on the ribbon or paper. Image cannot be printed in this type of printer.
Examples of this are the following
(a) Daisy Wheel Printer
(b) Drum Printer (Drur Printer)
(c) Chain Printer (chain Printer)
- Daisy wheel
Daisy wheel printers have character printing like typewriters. It prints higher resolution than hot matrix printer and its output is more reliable than dot matrix printer.
Daisy wheel printers are based on the old copywriter style. In this, printing is done with the help of daisy wheel which is made of plastic or metal. In this hall there are usually 96 petals, on whose ends the letters are raised like a yipwriter. This wheel is located on a stand which aligns it from right to left and from left to right. When the desired letter comes in the correct position when the wheel is rotated, the hammer is activated and strikes the wheel and the desired letter is printed on the paper with the help of carbon. In this, by changing the daisy wheel, it can be printed in different letters and designs, in which the printing of graphics is not possible. It can print at the speed of 10 to 50 characters per second.
- Line Printers
This type of printer prints a whole line at a time.
- Drum Printers
These are a type of line printer in which a cylindrical drum is continuously rotating. In this drum the letters are embossed. Between the drum and the paper, an ink is placed. Ribbon is the place where the letter is to be printed, at that place the hammer strikes the ribbon along with the paper. When the ribbon is struck, the reen exerts pressure on the letter in the drum, due to which the letter is printed on the paper .
Chain printers have letters embossed on a steel chain. This chain spins rapidly and letters are printed on the paper by the strike of the printer hammer on the carbon ribbon. Its working mechanism is almost like that of a drum printer. There are letters on the chain instead of only the drum, in which the chain spins rapidly. In order to speed up the print, the letter group on the chain is repeated many times, so it is not necessary to rotate the chain completely to print the desired letter on the correct print. For 132 characters per line, 132 hammers are required, the hammer strikes the carbon ribbon. The carbon ribbon chain is located between the paper and the hammer. In this also, it is necessary to have a balance between the speed of the chain and the hammer. In comparison to the drum, the letters rotate in a horizontal form, so that different font printing can be obtained from the same printer. They can print 400 to 2500 characters per minute. They are also used more in run offices which require high printing output.
Non impact Printer
These printers do not strike the paper, but leave a spray of ink on the paper to print letters or pictures. Non-impact printers use electrostatic chemicals and inkjet technology in printing.
Types of Non-impact printers
Inkjet Printer
Inkjet printer is printed by spraying ink on paper by putting small dots. their printing speed. pages per minute. Their printing quality is also good. These can be made up of letters and pictures in a variety of colors. For these measurements, A4 size paper is used.
pet pinter This printer is based on new technology. In the print head of this paper, nozzles with very fine holes are attached, from which a special type of ink (which has a high amount of iron) is thrown out, due to which the proper axis and shape are formed. An electronic ball is used to make the Swahi boot fall from the correct nozzle. The magnetized ink comes out from the nozzle by ventilating. Through the reflective plates, this ink object reaches the prescribed position and forms the letter shape. A good capacity inkjet printer has about 50 nozzles (nozzle) with a height of 7 which can print up to 600 dots per inch. At present, there are more than one doorbell-headed printer available with the help of which attractive specifications can be made in different colors. It can print 120 characters per second. Their printing cost is comparatively high. Only one copy can be printed by them at a time.
Thermal Printer
It uses heat to print letters on paper. By means of heat, the ink is melted and left on the paper, from which letters or pictures are printed. A fax machine is also a type of thermal printer.
Laser Printer
Laser Printer ( High Quality ) Characters and pictures are printed by laser printer. They can print different types of laser printers and characters of different styles with the help of laser rays.
This is the most developed printer of the present. They print one page simultaneously, so they are also called page printers. Due to the use of print heads and ribbons in line and serial printers, their speed used to slow down. After research and research, the laser printer with photocopying technology was developed. These printers have a photosensitive drum which is made of silicon. This drum has a layer of selenium which is very sensitive to light. The laser rays of the image of the letters are thrown on this drum, the place where the laser rays fall becomes chargeless (empty). When this drum comes in contact with the rotating toner (ink powder), the toner sticks to the empty space .
When this drum comes in contact with the paper, the toner sticks to the paper as it is. This paper is slightly heated by the printer, which causes the toner to stick permanently. It is useful for both letter and graphics type of print. The negative film required for Desk Top Publishing (DTP) is prepared with their help. Its printing can be ready in any font. Common laser printers print 15 to 60 pages per minute. Although there are also laser printers available to print 100 pages per minute but they are quite expensive.
Electro magnetic printer
Electro magnetic printers or electro photographic printers print at a very high speed. These printers come under the category of page printers (which print the entire page at a time). These printers can print a document within a minute. Can print 20000 lines inside i.e. can print at the rate of 250 pages per minute. It was developed through paper copier technology.
Electro Static Printer
This printer is generally used in large format It is used for key printing.It is mostly used in large printing presses, because their speed is very fast and the cost of printing is low.
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