Pallavi and Faraz

8/7/2019 Pallavi and Faraz

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EVOLUTION OF PRINTERSEVOLUTION OF PRINTERS

PRESENTED BY:

PALLAVI GOYAL (made the slides)

Q & A SESSION BY:

FARAZ

(collected the data)



INTRODUCTION:INTRODUCTION:

A printer is an output device that produces text andgraphics on paper.

The printed output is generally referred to as

hardcopy.

In addition, a few modern printers can directly

interface to electronic media such as memory card,or to image capture devices such as digital camera.



IMPACT PRINTERIMPACT PRINTER

An impact printer

has mechanisms

resembling those

of a typewriter. It forms characters

or images by striking

a mechanism such

as a print hammer or wheel against an

inked ribbon, leaving an

image on paper.



Types of impact printersTypes of impact printers

Dot-matrix printer Daisy wheel printers



DOT MATRIX PRINTERDOT MATRIX PRINTER

These printers contain a print head whichmoves horizontally usually from left toright and right to left or vertically across

the paper.

The print head contains an array of pins

which strikes against an inked ribbon toform a pattern of dots on paper .

Dot-matrix printers print about 40-300

characters per second (cps).



ContdContd«..«..

Each dot is produced by a tiny metal rod, also

called a "wire" or "pin", which is driven forward

by the power of a tiny electromagnet or

solenoid, either directly or through small levers.

Such printers would have either 7,9,18 or 24

pins on the print head. 24-pin print heads were

able to print at a higher quality.



Daisy wheel printers are impact printers invented in

1969.

They were used in e-typewriters, word processor &

computer systems in1972.

They offer high printing quality .They can print 20-80characters per second .

They are found in only electronic type writers ..Their

printing speed depends upon the type of print wheel

Daisy wheel printers



Impact PrintersImpact Printers

ADVANTAGES

They are used to make several carbon copies

at a time .

They are of low cost .They are good , reliable in those situations

where printing is more important than quality.

DISADVANTAGES

They are noisy .

They can only print lower resolution graphics.



Nonimpact PrintersNonimpact Printers

Non-impact printers, used

almost everywhere now,

are faster and quieter

than impact printers

because they have

fewer moving parts.

Nonimpact printers form

characters and images

without direct physical contact between the

printing mechanism and the paper.



1. INKJET PRINTERS1. INKJET PRINTERS

The inkjet printer was invented in 1976 .

Ink-jet printers spray small, electrically chargeddroplets of ink from four nozzles through holes

at high speed onto paper.

Ink-jet printers can print in color and are quieterand much less expensive than a color laser printer.However, they are slower and print in 300 ² 720dpi resolution range.

TYPES OF NON- IMPACT PRINTERS



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Desktop inkjet printers, as used in offices or at

home, tend to use aqueous inks based on a

mixture of water, glycol and dyes or pigments.

A typical ink-jet printer provides a resolution of

300 dots per inch, although some newer models

offer higher resolutions.



2. LASER PRINTER2. LASER PRINTERThe first Laser Printer was HP LASERJET

,released in March ,1984.

Laser printers are non-impact printers which

can print text and images in high speed and

high quality resolution, ranging from 600 to1200 dpi.

A single color laser printer can produce 4-16pages in a minute

Laser printers have built-in R AM chips to

store documents output from the computer .

To manage graphics and complex page

design lasers printers uses page descriptionlan ua e software.



Contd..Contd..

ADVANTAGESThey are faster than other printers .

They are quiet in operation .

They are useful in graphical presentation .These printers tend to have a longer life span.

DISADVANTAGESBecause of their print quality, speed they are more

expensive than other printers.



OTHER TYPE OF PRINTERSOTHER TYPE OF PRINTERS

LCD/LED Printers

They are electro photographic printers that are identical to laser

printers in most ways. Both LCD and LED printers use a light

source instead of a laser to create an image on a drum. The print

process is almost identical, but LED printers use Light Emitting

Diodes to charge the drum, and the other uses Liquid Crystals.

These printers produce a very high quality text and graphics print

out.

Network printer

Network printer is a printer that provides output capabilities to all

network users.

Plotters

They are large-scale printers that are very accurate at reproducing line

drawings. They are commonly used for technical drawings such as

engineering drawings or architectural blueprints.



ContdContd«.«.

Thermal printers

Thermal printers use direct thermal method by pushing

electrically heated pins against heat-sensitive paper.

Photo printers

Photo printers are color printers that produce photo lab

quality pictures on photo paper.

All in one printers

It is a machine that includes several functionalities

including printer, scanner, copier and fax.



FUTUREFUTURE

The main focus of all engineers is to develop

³3D PRINTER´ and ³INKLESS PRINTER´.

Pallavi and Faraz

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