The piece of computer hardware that creates
hard-copy printouts of documents.
A device that prints text or illustrations
Types Of Printers
Akin to a ball-head typewriter,
this type of printer has a plastic
or metal wheel on which the shape of
each character stands out in relief.
A hammer presses the wheel against a
ribbon, which in turn makes an ink
stain in the shape of the character
on the paper.Daisy-wheel printers
produce letter-quality print but
cannot print graphics.
Makes characters by striking pins
against an ink ribbon. Each pin
makes a dot, and combinations of
dots form characters and illustrations.
Sprays ink at a sheet of paper.
Ink-jet printers produce high-quality
text and graphics.
Utilizes the same technology as copy machines.
Laser printers produce very high quality
text and graphics.
LCD & LED :
Akin to a laser printer,
but utilizes liquid crystals or light-emitting
diodes rather than a laser to produce an
image on the drum.
Has a chain of characters or
pins that print an entire line at one
time. Line printers are very fast, but
produce low-quality print.
An affordable printer that works
by pushing heated pins against heat-sensitive
paper. Thermal printers are widely used in
calculators and fax machines.
The output produced by printers is
said to be either letter quality (as good as a
typewriter), near letter quality, or draft
quality. Only daisy-wheel, ink-jet, and
laser printers make letter-quality type.
Quantified in characters per second (cps)
or pages per minute (ppm), the speed of
printers varies widely. Daisy-wheel printers
tend to be the slowest, printing about 30 cps.
Line printers are fastest (up to 3,000 lines
per minute). Dot-matrix printers can print up
to 500 cps, and laser printers range from
about 4 to 20 text pages per minute.
Impact printers include all printers that
work by striking an ink ribbon. Daisy-wheel,
dot-matrix, and line printers are impact printers.
Non-impact printers include laser printers and
ink-jet printers. The important difference
between impact and non-impact printers is that
impact printers are much noisier.
Some printers (daisy-wheel and line printers)
can print only text. Other printers can print
both text and graphics.
Some printers, notably dot-matrix printers,
are restricted to one or a few fonts. In contrast,
laser and ink-jet printers are capable of printing
an almost unlimited variety of fonts. Daisy-wheel
printers can also print different fonts, but one
needs to change the daisy wheel, making it hard
to mix fonts in the same document.