printer

pRinter

PRINTER transfers an image from your
computer or memory card

on to a physical object transferring to
paper or card etc using ink.

Basically transferring an image from
computer data onto a

physical object with ink.

characteristics of

printers

• Inkjet printers using electrostatic spray
technology.



• Laser printers using
imaging drums.





• Thermal printers are commonly
found in retail.

• Most are used to print receipts.



• 3D printers are used in
design and manufacturing.




• Dot matrix printers using impact technology are
used in applications that require carbon copies.

Inkjet Printer

• Inkjet printers are easy to use and
usually less expensive than
laser printers




• Advantages of an inkjet printer are initial low
cost, high

resolution, and they are quick to warm up




• Disadvantages of an inkjet printer are that the
nozzles are prone

to clogging, ink cartridges can be expensive, and
the ink is wet for

a few seconds after printing

Ink Cartridges / Paper

• Use ink - dispe
rsion printing

• Paper quality affects quality of
printed output.



Printer Head




• Inkjet printers use ink cartridges that
spray ink onto a page

through tiny holes. The tiny holes are
called nozzles and are

located in the print head.

Laser Printer

• A laser printer is a high-quality,


fast printer that uses a laser beam
to create an image.



• Advantages of a laser printer are low cost per
page, high ppm,

high capacity, and prints come out dry.



• Disadvantages of a laser printer are high
cost of startup, and that

toner cartridges can be expensive.

drum

• The drum is a metal cylinder
that is coated with a light-
sensitive
insulating material.
• When a beam of laser light

strikes the drum, it becomes a
conductor at the point where

the light hits it.

Toner Cartridge /

Paper

• As the drum rotates, the laser beam draws


an electrostatic image
upon the drum.
• This undeveloped image is passed by a

supply of toner.
• The toner is a negatively charged
combination of plastic and metal

particles.
• The electrostatic charge attracts toner to

the image. The drum
turns and brings the exposed image in

contact with the paper.

Thermal Printer

• Thermal paper becomes black when heated.


• After a roll of thermal paper is loaded, the
feed assembly moves
the paper through the printer.
• Electrical current is sent to the heating
element in the print head to generate heat.
• The heated areas of the print head make

the image on the paper.




• Advantages of thermal printers are that they last a long time
because there are few moving parts, their operation is quiet
and
there is no cost for ink or toner.

• Disadvantage of thermal prin
ter are, the thermal paper is

expensive, it must be stored at room temperature and can
degrade

over time. Thermal printer images are poor quality, and color
printing is not available.

Impact Printer




• Impact printers have print heads that
strike an inked ribbon,

causing characters to be imprinted on
the paper.

• Dot matrix and daisy wheel are
examples of impact printers.

Printer Head


• A dot matrix printer has a print

head containing pins that are
surrounded by electromagnets.

Ink Rib
bon


• When energized, the pins push forward onto
the ink ribbon,
creating a character on the paper.
• The number of pins on a print head, 9 or 24,

determines the
quality of the print. The highest quality of

print that is produced
by the dot matrix printer is referred to as near

letter quality
(NLQ).

Advantages vs Disadvantages

impact printer


• Advantage of impact printers
is that the ribbon is less
expensive
than inkjet cartridges or laser
printer toner cartridges. They

can
use continuous feed or normal
sheets of paper and can print

carbon copies.

• Disadvantages
include the fact

that they are noisy, the graphics
are low-resolution, and they have

limited color-printing
capabilities.