Printer

 The first electronic printer was the EP-101, invented by the Japanese company Epson and released in 1968.  so it was debuted in the market, The first commercial printers typically used mechanisms from electric typewriters and teletype machines.

INTRODUCTION- The printer is an device that prints text document & image on paper.

it is peripheral output device.

IMPACT PRINTER- Printers are used for printing document  as well as graphics.

the working of impact printer is very similer

to that type of printer. lmpact printer are those printer, where physical contact is established between print head , cartridge& 

media paper . the impact result in printing on paper under the ink ribbon. the dot matrix printer is an example of impact printer.

DOT MATRIX PRINTER- Dot matrix printer uses a matrix of metal pins on the electromagnet printhead to creat dots & ink 

soaked ribbon is placed between the paper

& the print head . due to this dot matrix printer are noisy.

NON IMPACT PRINTER- Non impact printer are characterized by quit operation. as physical contact is not established between printhead , cartridge& media paper . inkjet

& laser printer are type of non impact printer.

INKJET PRINTER- An Inkjet printer places extremely minute amount of electrically charged ink on paper to create image or text

 the drop of ink are sprayed through a series of nozzels. these drops are around 60 microns . it use colour as well as monocrome

cartridge . this type of printer provide high quality printing at an affordable price.

LASER PRINTER- The laser printer uses a beam of laser for the purpose of printing.

Structure of printer- The printer consists of 

various parts that accept support& move

paper during the purpose of printing. all these part have to works in coordination so the printers works properly. the different parts of a printer are.

feeder- accept the paper & forward individual sheets as printing progress.

support- Provides a support for the paper that is loaded inthe feeder.

Edge guide- provides proper adjustment according to the width of the paper.

cover- The printing process . The cover is opend only while replacing ink  cartridge.

out put tray- Accept the paper that comes out.

out put tray extension- Holds  the paper that

comes out of the printer.

Sensor- Many  sensor are available depending on the  type printing edge paper , sensor , head home position sensor

& cover sensor.

Logic card- It is the main system board of the

printer.

S.M.P.S.- Main power supply unit inside a printer which provides power to logic card.

cartridge- contain the ink for printing.

Print head- Delivers the to page that is being printed.

cover of cartridge- Provides a cover for the ink  cartridge. this cover is removed only when a cartridge has to be replaced.

adjustable lever- Provides adjustment for distance between printhead & paper. this adjustment is essential avoding to ink of the paper.

control panel- Provides control for various 

action of the printer. the control panel consists of following button.

Power- Turn the printer on or ff. if this button pressed  twice  when the printer is 

on ,printer memory is erassed.

Paper - Accept or eject paper. This button is pressed to resume printing after an error in the process.

Ink level- Enable the print head to check the ink level. when sufficient ink is detched in the cartridge, if the cartridge is empty. The ink level button makes the print head go to

carteidge replacement mode. After the cartridge is replaced to print head resume 

it default mode.

Roll paper- Used to roll paper,this button prints a guide line for the cutting to roll paper.