Printers,types ,working and use..ppt

7/28/2019 Printers,types ,working and use..ppt

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Printerits types, working andusefulness


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Printers

Impact Printers Non-Impact Printers

Daisy

wheel

Dot-

MatrixInkjet Thermal Laser


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What is a printer?

An external hardware device responsiblefor taking computer data and generating a

hard copy of that data. Printers are one ofthe most commonly used peripherals andthey print text and still images on the

paper.


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Print Quality

(1) Near typeset quality: A Lower quality print similar to the output of a type-

writer. (2) Letter quality: Print made up by fully formed (solid line) characters. (3) Near letter quality: A print of high quality formed by multiple passes of

print head over the same letter. (4) Standard quality: A high quality print formed by a single pass of the

print head. (5) Draft quality: A print formed with minimum number of dots or

lines and are smaller than the standard qualitycharacters.


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Factors affecting print quality (1) DPI: It is a measurement of printers resolution indicating how

many ink dots can be placed by the printer in one squareinch. The higher the DPI, the sharper is image.

(2) Type of printer:

Each type of printer has its own capabilities of printing.Some types of printers produce high quality print whileother produce low quality print.

(3) Print Mode: The printing mode may also affect the quality. For

example the draft mode increases the print rate but quality

is reduced. (4) Toner: The quality and amount of toner also affects print

quality.


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ImpactPrinter These printers have a

mechanism thattouches the paper tocreate an image.

These printers workby banging a printhead containing a

number of metal pinswhich strike an inkedribbon placed betweenthe print head and

the paper.

An impact printer showing detailsof print head.sss


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Non-Impact Printers

These printers create an

image on the print

medium without the use

of force. They dont touchthe paper while creating

an image. Non-impact

printers are much quieter

than impact printers asthey dont strike the

paper.A non-impact printer


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Dot Matrix Printer

The term dot matrixrefers to the process ofplacing dots to form an

image. Its speed is usually 30 to

550 characters per second(cps).

This is the cheapest andthe most noisy printerand has a low printquality. Dot Matrix were1st introduced by

Centronics in 1970.


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How Dot-Matrix works?

The dot matrix forms images one character at atime as the print head moves across the paper.

Uses tiny pins to hit an ink ribbon and the

paper much as a typewriter does. This printer arranges dots to form characters

and all kinds of images.

9 to 24 vertical column pins are contained in a

rectangular print head. When print head movesacross the paper, pins are activated to form adotted character image. These printers can

produce carbon copies along with the originals.


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A typical dot matrix output
http://en.wikipedia.org/wiki/Image:Dot_matrix_example_text.png


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Advantages/Dis-advatages of

Dot-Matrix 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 isbasically an impact

printer consisting of awheel and attachedextensions on whichmolded metal characters

are mounted. A daisywheel printer producesletter quality print and itcant 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 inthe form of a character mounted on thewheel extensions.

These printers are very noisy as thereoccur 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 qualityprint. A standard Inkjetprinter has a resolution

of 300dpi. Newer modelshave further improveddpi. Inkjet printers wereintroduced in the later

half of 1980s and arevery popular owing totheir extra-ordinaryperformance.


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How Inkjet Printer works? (1) Print head having four ink

cartridges moves .

(2) Software instructs where toapply dots of ink, which color andwhat quantity to use.

(3) Electrical pulses are sent to theresistors behind each nozzle.

(4) Vapor bubbles of ink areformed by resistors and the ink is

forced to the paper throughnozzles.

(5) A matrix of dots formscharacters and pictures.

Colorcartridgeshowinginkjetnozzles.


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Inside an Inkjet Printer? (1) Print head Assembly: Contains a series of nozzles

(2) Ink Cartridge:

Depending on the model &manufacturing of printers,ink cartridge come in variouscombinations.

(3) Print head stepper motor:

A stepper motor moves theprint head assembly back

and forth across the paper.


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Inside an Inkjet printer?

(4) Stabilizer bar:

The movement of printhead is controlled and

made precise by astabilizer bar.

(5) Belt:

A belt is used to attachprint head assembly tothe stepper motor.

Here you can see stabilizer bar and belt


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Inside the Inkjet Printer? (6) Paper tray/feeder:

It enables the user to load thepaper into the printer.

(7) Rollers:

Control the movement of the paper.

(8) Control circuitry:

control all the mechanical aspects of

the operation as well as decode theinformation sent to the printer fromthe computer.


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Advantages/ Dis-advantagesAdvantages: (1) High resolution output.

(2) Energy efficient.

(3) Many options to select. Dis-advantages:

(1) Expensive.

(2) Special paper required for higherresolution output.

(3) Time consuming in case of graphics

printing.


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Thermal Printer

Thermal printers are in-expensive printersmostly used in faxmachines. The Thermalprinters are furtherclassified into two types.

(1) Electro thermalprinters:

(2) Thermal Waxprinters:

A fax machine using a thermal printer


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How thermal printer works?

Thermal printers use heated pins andribbons with different color bands. These

printers contain a stick of wax like ink.The ribbon passes in front of a print headthat has a series of tiny heated pins. The

pins cause the wax to melt and adhere tothe paper and when temperature reachesto a certain level, it is hardened.


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Laser Printer

Laser printers use veryadvanced technology

and produce a highquality output. Laserprinters can alsoproduce high quality

graphics images. Resolution is 600 to

1200dpi.


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How Laser printer Works?

(1) Paper is fed and the drum rotates.

(2) A laser beam conveys information from the

computer to a rotating mirror and thus an imageis created on the drum.

(3)The charges on the drum are ionized and thetoner sticks to the drum.

(4)Toner is transferred from drum to paper. (5)Heat is applied to fuse the toner on the

paper.


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Multi-function printer

A multi function printerabbreviated as MFP is anall purpose device thatprints, faxes, copies andscans. A single multifunction printer canreplace several bulkydevices. A multi functionprinter is also known as

AIO. These printers useinkjet technology andprovide high quality printbut at slow speed.


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Plotter A large scale printer

which is very accurate inproducing engineeringdrawings and

architectural blueprints. Two types of plotters are

flatbed and drum.

Flatbed plotters are

horizontally aligned whiledrum plotters arevertically positioned.


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Printers for different users

To choose a printer from a printers familyfollowing considerations are to be made.

(1) Whats 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

For home users, the quality of the printand the price of the printer both matter.

So a better choice in such case is aportable color Inkjet printer.

If the budget of the user is good enough

then the best choice is a personal laserprinter which enhances both the speedand quality of the print.


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Small and medium offices

For small and medium scale offices abetter option is a multi-function printer

which is an integrated device fulfillingvarious requirement of the office.

For better output, a laser printer is the

best choice.


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Printers for banks, largebusiness organizations and

companies In banks, large size business

environments and companies printers with

networking capabilities should bepreferred which can increase productivityand reduce the cost without compromisingon the quality. Of course laser printer is

quite suitable choice but multi-functionalprinter and inkjet printer can also playvital role.


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Conclusion

In fact computer world is incompletewithout printers in the modern age oftechnology. A printer is one of the basicneeds of every computer user and onecan not utilize computer resourcesproperly in the absence of a qualityprinter.


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References

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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