PrinterPrinter

PrinterPrinter

• Printer is one of the most important Printer is one of the most important peripheral component of the computer. peripheral component of the computer.

• The printers are evaluated on the basis The printers are evaluated on the basis of the following factors: of the following factors:

- Printer Resolution:- It is measured in - Printer Resolution:- It is measured in dots per inch(dpi). It indicates the dots per inch(dpi). It indicates the number of vertical and horizontal dots number of vertical and horizontal dots that can be printed. Higher the that can be printed. Higher the resolution better is the quality. resolution better is the quality.

Printer( con…)Printer( con…)

• Speed : It is the number of pages Speed : It is the number of pages printed per minuteprinted per minute

• Paper Capacity: The number of pages Paper Capacity: The number of pages that can be accommodated in the that can be accommodated in the paper tray. The different sizes of pages paper tray. The different sizes of pages that can be printed by the printerthat can be printed by the printer

• Cost of Paper: It indicates the cost of Cost of Paper: It indicates the cost of any special paperany special paper

Classification of PrinterClassification of Printer

• In general Printers can be classified in two broad In general Printers can be classified in two broad categories categories - IMPACT TYPE PRINTERS - IMPACT TYPE PRINTERS

• In this type, In this type, physical forcephysical force is applied to get an is applied to get an impression of the character. impression of the character. E.g. DAISY-WHEEL printers, DOT-MATRIX printers, E.g. DAISY-WHEEL printers, DOT-MATRIX printers, - NON-IMPACT TYPE PRINTERS - NON-IMPACT TYPE PRINTERS

• In this type, physical force is NOT applied to get In this type, physical force is NOT applied to get an impression of character; instead either the an impression of character; instead either the IMAGE is IMAGE is transferred to papertransferred to paper electro statically or electro statically or ink is sprayed on to paper to form the characterink is sprayed on to paper to form the character. . E.g. INK-JET printers, LASER printersE.g. INK-JET printers, LASER printers

Daisy Wheel PrinterDaisy Wheel Printer

Dot Matrix Printer (DMP)Dot Matrix Printer (DMP)

DMPDMP

• Dot-Matrix printers strike the page with Dot-Matrix printers strike the page with small rods (called needles) that protrude small rods (called needles) that protrude from the print headfrom the print head

• DMPs can be characterized by following DMPs can be characterized by following 5 parameters. 5 parameters. - No of pins in print head. - No of pins in print head. - Characters per second (CPS) - Characters per second (CPS) - Characters per inch (CPI) - Characters per inch (CPI) - Interface used [parallel / serial] - Interface used [parallel / serial]

DMP( pin, char/s, char/inch )DMP( pin, char/s, char/inch )• No of No of pinspins in print head. in print head.

•• 9 pins9 pins

•• 24 pins24 pinsCharacters per second (CPS)Characters per second (CPS)

240 char/s 240 char/s Characters per inch (CPI)Characters per inch (CPI)

10 cpi, 12 cpi or 15 cpi. 15 cpi mode 10 cpi, 12 cpi or 15 cpi. 15 cpi mode or 17 cpi is called as or 17 cpi is called as condensed condensed modemode. .

new printers 20 cpi is also possiblenew printers 20 cpi is also possible

DMP( interface )DMP( interface )

• Two types of interfaces used to communicate Two types of interfaces used to communicate with computer. with computer. - Parallel - Parallel - Serial - Serial

• For parallel interface, we use a standard 36 pin For parallel interface, we use a standard 36 pin centronics interface. centronics interface.

• This interface has This interface has - 25 pin D type female connector to the - 25 pin D type female connector to the computer side computer side - 36 pin Amphenol type connector to printer side- 36 pin Amphenol type connector to printer side

DMPDMP

DMPDMP

• Two types of print heads Two types of print heads -With cable -With cable -Without cable. -Without cable. With cable With cable

• The head cable is directly soldered to the The head cable is directly soldered to the print head print head

• If the cable becomes faulty you have to If the cable becomes faulty you have to throw the complete head. throw the complete head.

• Hence, it is not preferable. Hence, it is not preferable. e.g. TVSE series except LSP100 e.g. TVSE series except LSP100

DMPDMP

Without cable Without cable • The head cable is connected to head The head cable is connected to head

through a connector. through a connector.

• If the cable is gone faulty, then it can If the cable is gone faulty, then it can be easily replaced. be easily replaced.

• Hence, it is preferred. Hence, it is preferred.

eg. EPSON series except FX105 MX80eg. EPSON series except FX105 MX80

DMPDMP

• This provides the movement for the This provides the movement for the print head. print head.

• It is having a base for head & two It is having a base for head & two rails. rails.

• Over these rails the base or Over these rails the base or ‘carriage’ moves horizontally from ‘carriage’ moves horizontally from left to right & back. left to right & back.

DMPDMP

• Carriage motor is basically a stepper Carriage motor is basically a stepper motor. motor.

• Carriage motor provides theCarriage motor provides the actual actual force to move theforce to move thecarriagecarriage

Ink jet printerInk jet printer

• The ink tiny droplets of ink onto the The ink tiny droplets of ink onto the paperpaper

• Its available in black and white and Its available in black and white and color printercolor printer

• 300 dpi, 16 pages per minute (PPM) 300 dpi, 16 pages per minute (PPM)

Ink jet printerInk jet printer

• The most popular way of connecting The most popular way of connecting a printer to a computer is through a printer to a computer is through the parallel port (LPT)the parallel port (LPT)

• Universal Serial Bus (USB) port.Universal Serial Bus (USB) port.

• small computer system interface small computer system interface (SCSI) port. (SCSI) port.

Ink jet PrinterInk jet Printer

• 512 KB random access memory 512 KB random access memory (RAM) to 16 MB RAM, depending on (RAM) to 16 MB RAM, depending on the model.the model.

• If the trigger is not depressed, the If the trigger is not depressed, the printer lights up the "Out of Paper" printer lights up the "Out of Paper" LED and sends an alert to the LED and sends an alert to the computer computer

Laser PrinterLaser Printer

• 1200 dots per inch1200 dots per inch• 17-19 pages per minute for text and 6 to 7 pages 17-19 pages per minute for text and 6 to 7 pages

per minute for graphics. per minute for graphics. • ~600 and ~1,000 volts.~600 and ~1,000 volts.• Toner (~200 and ~500 volts) Toner (~200 and ~500 volts)

•ProcessProcess• 1.Clean1.Clean 4.Develop4.Develop• 2.Charge2.Charge 5.Transfer5.Transfer• 3.Write3.Write 6.Fuse6.Fuse•

Laser printerLaser printer

Laser processLaser process

– 1. 1. Cleaning:Cleaning: Excess toner is scraped from the Excess toner is scraped from the photoelectric drum.photoelectric drum.

– 2. 2. ConditioningConditioning: A uniform -600 volt charge is : A uniform -600 volt charge is placed on the photoelectric drum by the primary placed on the photoelectric drum by the primary corona.corona.

– 3. 3. Writing:Writing: Laser diodes write an invisible electric Laser diodes write an invisible electric image on the photoelectric drum by causing the image on the photoelectric drum by causing the drum surfacedrum surfaceto be less negative wherever the laser beam hits.to be less negative wherever the laser beam hits.

Laser processLaser process

4. 4. DevelopingDeveloping: This is where the transfer roller : This is where the transfer roller places the toner on the drum. The toner sticks places the toner on the drum. The toner sticks to the areas thatto the areas thathave had the electric charge lessened due to have had the electric charge lessened due to the laser beam.the laser beam.

55. Transfer. Transfer: The secondary corona uses a : The secondary corona uses a positive charge to attract the toner from the positive charge to attract the toner from the drum to the paper. The Paper gets charged by drum to the paper. The Paper gets charged by corona too.corona too.

6. 6. FusingFusing: The toner is then melted into the : The toner is then melted into the paper paper

Printer Printer

THE ENDTHE END