Types of Impact Printers

Dot Matrix

Forms characters using row(s) of pins, 9, 18, or 24 which impact the ribbon on top of the paper. Also called pin printers. The more pins, the smoother-looking the characters. Most dot matrix printers have the characteristics below:

A dot-matrix y & an enlargement

Animation showing how columns of pins print the letter y (Credit: Bill Lewis)

Bi-directional -	prints left to right and also right to left
Tractor feed -	uses sprockets to pull continuous-feed paper
Friction feed -	uses pressure to pull single sheets
Advantages:	Inexpensive Can do multi-copy forms
Disadvantages:	Can be slow Loud Graphics of low quality, if possible at all

Chain and Band Printers

Uses characters on a band or chain that is moved into place before striking the characters onto the paper.

Advantages:	Very fast up to 3000 lpm (lines per minute)
Disadvantages:	Very expensive Very loud

Date: 2015-01-11; view: 1156

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