Dot Matrix Printer
Printer
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Printer Definition

A printer produces
a paper copy of
information
generated by a
computer.
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Printers
Impact Printers
Daisy Dot- Dotwheel Chain Wheel
Non-Impact Printers
Inkjet
Thermal
Laser
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“Impact Printer”

1. These printers have a
mechanism that touches
the paper to create an
image. 2. Produces text
and images when tiny
wire pins on print head
strike the ink ribbon by
physically contacting the
paper
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Impact
Non-Impact
Produces text and images when tiny wire Produces text and graphics on
pins on print head strike the ink ribbon by paper without actually striking the
physically contacting the paper
paper(no physically contact to
paper)
Uses ink ribbon
Uses ink spray
Print quality lower in some types
High quality of output, capable of
printing fine and smooth details
Low printing speed
Reasonably fast
Generally noise because of the striking
activity
Low noise because there is no striking
mechanism
Not commonly used today
Most commonly used printer today
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“Dot Matrix Printer”
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
The term dot matrix
refers to the process of
placing dots to form an
image.
This is the cheapest and
the most noisy printer
and has a low print
quality. Dot Matrix were
1st introduced by
Centronics in 1970.
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“A typical dot matrix output”
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“Advantages/Dis-advatages of
Dot-Matrix”
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Advantages:
(1) In-expensive.
(2) Low per page cost.
(3) Energy efficient.
Dis-advantages:
(1) Noisy
(2) Low resolution
(3) Limited fonts flexibility
(4) Poor quality graphics output.
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“Daisy Wheel Printer”

A daisy wheel printer is
basically an impact
printer consisting of a
wheel and attached
extensions on which
molded metal characters
are mounted. A daisy
wheel printer produces
letter quality print and it
can’t produce graphics
output.
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How Daisy wheel printer
works?


In a daisy wheel printer, a hammer
presses the wheel against a ribbon which
in turn makes an ink stain on the paper in
the form of a character mounted on the
wheel extensions.
These printers are very noisy as there
occur great movement during the printing.
Its printing speed is also very slow ,i.e.
less than 90cps.
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“Ink-Jet Printer”

It is a non-impact printer
producing a high quality
print. A standard Inkjet
printer has a resolution
of 300dpi. Newer models
have further improved
dpi. Inkjet printers were
introduced in the later
half of 1980s and are
very popular owing to
their extra-ordinary
performance.
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How Inkjet Printer works?
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(1) Print head having four ink
cartridges moves .
(2) Software instructs where to
apply dots of ink, which color and
what quantity to use.
(3) Electrical pulses are sent to the
resistors behind each nozzle.
(4) Vapor bubbles of ink are
formed by resistors and the ink is
forced to the paper through
nozzles.
(5) A matrix of dots forms
characters and pictures.
Color cartridge showing inkjet nozzles
.
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Advantages/ Dis-advantages

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Advantages:
(1) High resolution output.
(2) Energy efficient.
(3) Many options to select.
Dis-advantages:
(1) Expensive.
(2) Special paper required for higher
resolution output.
(3) Time consuming in case of graphics
printing.
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Thermal Printer

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Thermal printers are inexpensive printers
mostly used in fax
machines. The Thermal
printers are further
classified into two types.
(1) Electro thermal
printers:
(2) Thermal Wax
printers:
A fax machine using a thermal printer
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“Laser Printer”

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Laser printers use very
advanced technology
and produce a high
quality output. Laser
printers can also
produce high quality
graphics images.
Resolution is 600 to
1200dpi.
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“Plotter”

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A large scale printer
which is very accurate in
producing engineering
drawings and
architectural blueprints.
Two types of plotters are
flatbed and drum.
Flatbed plotters are
horizontally aligned while
drum plotters are
vertically positioned.
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“Printers for different users”
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To choose a printer from a printer’s family
following considerations are to be made.
(1) What’s the budget?
(2) Is color needed or just black& white?
(3) What is the Volume of the output?
(4) How important is the quality of the output?
(5) What special features are needed?
(6) Is the printer is to be used by a single user
or a whole network?
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“Printer for Home users”

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For home users, the quality of the print
and the price of the printer both matter.
So a better choice in such case is a
portable color Inkjet printer.
If the budget of the user is good enough
then the best choice is a personal laser
printer which enhances both the speed
and quality of the print.
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“Small and medium offices”

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For small and medium scale offices a
better option is a multi-function printer
which is an integrated device fulfilling
various requirement of the office.
For better output, a laser printer is the
best choice.
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“Printers for banks, large
business organizations and
companies”

In banks, large size business
environments and companies printers with
networking capabilities should be
preferred which can increase productivity
and reduce the cost without compromising
on the quality. Of course laser printer is
quite suitable choice but multi-functional
printer and inkjet printer can also play
vital role.
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“Conclusion”

In fact computer world is incomplete
without printers in the modern age of
technology. A printer is one of the basic
needs of every computer user and one
can not utilize computer resources
properly in the absence of a quality
printer.
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“References”
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Books:
(1) Fundamentals of Electronic Data Processing.
By: S.Jaiswal
(2) COMPUTERS. By: Larry Long/Nancy Long.
(3) Using Information Technology. (Course book)
Websites:
http://redhat.com/docs/manuals
http://doit.ort.org/course/output/307.htm
http://deverace.com/printers_types.html
http://howstuffworks.com
http://prenhall.com/long
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