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Information and Communication Technology Applications

(i) Impact Printers. The printers that print the characters by striking against the ribbon and onto the
Notes paper, are called Impact Printers. These printers are of two types—(a) Character; and (b) Line printers.
(a) Character Printers. These printers print one character at a time. These printers can be further
classified into two types–Daisy Wheel and Dot Matrix Printers.
Daisy Wheel Printers. These printers print the characters by a mechanism, called daisy wheel that
uses a plastic or metal hub with spokes. The characters are embossed on the radiating spokes and
printed by striking these spokes against the ribbon and paper. Daisy Wheel printers give a good
quality but they are expensive than Dot Matrix printers.

Figure 5.18: Classification of Printers

Classification of Printers

Impact Printers Non-impact Printers

Laser Printers
Character Printers Line Printers

Daisy Wheel Drum Inkjet Printers
Printers Printers

Dot Matrix Chain Thermal Printers
Printers Printers

Dot Matrix Printers. These printers print the characters by putting dots onto the paper. They do not
give better printing quality than daisy wheel printers, but are faster in speed. The printing speed of
a dot matrix printer can be upto 360 cps (characters per second). They are widely used with
microcomputers in most of the offices. A picture of a dot matrix printer is shown in Figure 5.19.

Figure 5.19: A dot Matrix Printer

(b) Line Printers. These printers print one line at a time. Their printing speed is much more than
character printers. A picture of a line printer is shown in Figure 5.20. They are also of two types–
Drum Printers and Chain Printers.

44 LOVELY PROFESSIONAL UNIVERSITY