Printers :-printers are us3d to get a hard copy of the output generation by computer. The quality of the printout depends on the type of the printer used to print it. Printers come with different speeds, quality, and other facilities. The printers are broadly divided into two categories : Impact and Non-impact printers.
1. Impact printer :- Most printers operate like the traditional typewriter. Images are placed on paper by striking (impacting) a pattern against an inked ribbon, which in turn strikes the paper and thus the image is printed. The most common impact prints is the matrix printer.
A) Dot matrix printer :- This type of printer prints one character at time with speed ranging from 80 c. p. s. to 900 c. p. s. (Character per second) It is named as dot matrix due to its characteristics of using matrix code for printing the character. It is available in various sizes like 40 columns, 80 columns, 132 columns etc. (the size means maximum number of characters in normal size of 10 characters pe4 inch, that can be printed in each line output) The print quality of dot matrix varies from 5 c p i to 17 c p i .
B) Daisy wheel printer :- High quality output is obtained from daisy wheels and laser printers. In the daisy wheel printer, each spoke of the plastic wheel has character embossed on it A motor rotates the wheel and when the desired character spoke reaches the correct position, a print hammer strikes it to produce the output. The drawbacks of daisy wheels is that they are very slow. The character set on a wheel is of a fixed typeface. To change the typeface of characters one has to change the daisy wheel.
C) Line printer :- Advance business application required high-speed quality print. Instead of printing character by character another principle is used in which a number of character in a row and printed simultaneously . Line printers prints at very high speeds about five to 20 lines per second or 200 to 1200 lpm (line per minute) for 132 -column printer. It is costlier and it is used only where required very large amount of paint job to be done regularly.
1. Impact printer :- Most printers operate like the traditional typewriter. Images are placed on paper by striking (impacting) a pattern against an inked ribbon, which in turn strikes the paper and thus the image is printed. The most common impact prints is the matrix printer.
A) Dot matrix printer :- This type of printer prints one character at time with speed ranging from 80 c. p. s. to 900 c. p. s. (Character per second) It is named as dot matrix due to its characteristics of using matrix code for printing the character. It is available in various sizes like 40 columns, 80 columns, 132 columns etc. (the size means maximum number of characters in normal size of 10 characters pe4 inch, that can be printed in each line output) The print quality of dot matrix varies from 5 c p i to 17 c p i .
B) Daisy wheel printer :- High quality output is obtained from daisy wheels and laser printers. In the daisy wheel printer, each spoke of the plastic wheel has character embossed on it A motor rotates the wheel and when the desired character spoke reaches the correct position, a print hammer strikes it to produce the output. The drawbacks of daisy wheels is that they are very slow. The character set on a wheel is of a fixed typeface. To change the typeface of characters one has to change the daisy wheel.
C) Line printer :- Advance business application required high-speed quality print. Instead of printing character by character another principle is used in which a number of character in a row and printed simultaneously . Line printers prints at very high speeds about five to 20 lines per second or 200 to 1200 lpm (line per minute) for 132 -column printer. It is costlier and it is used only where required very large amount of paint job to be done regularly.
No comments:
Post a Comment