explain any two type of impact printer in long type answer
Answers
Answer:
Dot Matrix
A dot matrix printer has a print head through which the tips of nine wires project, forming a vertical column of dots. As the print head scans a page, an electronic mechanism pushes the wires out with precision timing. The wire tips strike a ribbon which touches the paper, producing horizontal patterns of dots that form letters, numerals, lines and other characters. Because the printer can control the placement of individual dots, the mechanism can produce simple graphics such as line drawings and bar codes. Dot matrix printers produce a shrill buzzing noise; unless the printer has a sound-deadening case, it is not suitable for quiet environments.
Chain
A chain printer has a set of metal characters and numbers arranged in a continuous loop, resembling the blade of a chainsaw. Behind the paper, a row of hammers strike the characters as they come around on the chain. The chain mechanism has print speeds up to several hundred lines per minute, faster than a dot matrix. The chain printer is also more expensive than a dot matrix, as it is more complicated mechanically. Its character set is limited to whatever the chain contains; graphics made with a chain printer are primitive at best. Like a dot matrix printer, a chain printer is somewhat noisy