Printer is an output device which prints the result on paper. The copy of this result on paper is called hard copy. The information obtained by the computer is saved on printer memory because printer does not work fast as information obtains by computer.
In other words we can say that printer is an output device that converts softcopy to hard copy. There are different types of printer which re below:
1. Impact Printers
2. Non Impacts Printers
Impact Printers: Impact Printers are the printers that create output on paper by using a device to beat a linked ribbon, burning ink from the ribbon onto the paper. The process of impact printer is similar to type writer which has hammer of metal or print head.
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There are different type impact printers which are:
1. Character Printer
2. Line Printer
Character Printer: These printers print single character at a time. It is slow printer and divided into daisy wheel and dot matrix printer.
1. Daisy Wheel Printers: Daisy wheel printers print the characters by using metal hub and spokes in these spokes characters are printed when these spokes impacting on ribbon and paper this is called daisy wheel device. It provides high resolution result comparison as dot matrix so it is called letter quality printer. It runs in horizontal direction. This type printer is slow.
2. Dot Matrix printers: Dot matrix printer is also impact printer which is very soft at printing time. It has lots of pins at printer head. It print a dot by attach ribbon of each pin on paper. Joining lot of dot make a character. It has a vertical group of pins in printer head.
Line Printer: Line printer is also impact printer which prints one line at a time. Line printer has high speed comparison as character printer. It prints 300 to 3000 lines per minute. These printers are used for huge work in mini and main frame computer. There are two types of line printer which are:
1. Drum Printers: These printer prints the line by a rotating drum having a ring of characters for every print positions, the hammers collision every character of the drum at the same time.
2. Chain Printers: Chain printer prints the line by rotating chain having ring characters for every print place. Really the working device of this print like to the drum printer.