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This is basic Knowledge about Printer and its types and technology.

Published in: Education, Technology


  1. 1. Printer
  2. 2. Printer <ul><li>Printer is one of the most important peripheral component of the computer. </li></ul><ul><li>The printers are evaluated on the basis of the following factors: </li></ul><ul><li>- Printer Resolution:- It is measured in dots per inch(dpi). It indicates the number of vertical and horizontal dots that can be printed. Higher the resolution better is the quality. </li></ul>
  3. 3. Printer( con…) <ul><li>Speed : It is the number of pages printed per minute </li></ul><ul><li>Paper Capacity: The number of pages that can be accommodated in the paper tray. The different sizes of pages that can be printed by the printer </li></ul><ul><li>Cost of Paper: It indicates the cost of any special paper </li></ul>
  4. 4. Classification of Printer <ul><li>In general Printers can be classified in two broad categories </li></ul><ul><li>- IMPACT TYPE PRINTERS </li></ul><ul><li>In this type, physical force is applied to get an impression of the character. </li></ul><ul><li>E.g. DAISY-WHEEL printers, DOT-MATRIX printers, </li></ul><ul><li>- NON-IMPACT TYPE PRINTERS </li></ul><ul><li>In this type, physical force is NOT applied to get an impression of character; instead either the IMAGE is transferred to paper electro statically or ink is sprayed on to paper to form the character . </li></ul><ul><li>E.g. INK-JET printers, LASER printers </li></ul>
  5. 5. Daisy Wheel Printer
  6. 6. Dot Matrix Printer (DMP)
  7. 7. DMP <ul><li>Dot-Matrix printers strike the page with small rods (called needles) that protrude from the print head </li></ul><ul><li>DMPs can be characterized by following 5 parameters. </li></ul><ul><li>- No of pins in print head. </li></ul><ul><li>- Characters per second (CPS) </li></ul><ul><li>- Characters per inch (CPI) </li></ul><ul><li>- Interface used [parallel / serial] </li></ul>
  8. 8. DMP( pin, char/s, char/inch ) <ul><li>No of pins in print head. </li></ul><ul><li>• 9 pins </li></ul><ul><li>• 24 pins </li></ul><ul><li>Characters per second (CPS) </li></ul><ul><li>240 char/s </li></ul><ul><li>Characters per inch (CPI) </li></ul><ul><li>10 cpi, 12 cpi or 15 cpi. 15 cpi mode or 17 cpi is called as condensed mode . </li></ul><ul><li>new printers 20 cpi is also possible </li></ul>
  9. 9. DMP( interface ) <ul><li>Two types of interfaces used to communicate with computer. </li></ul><ul><li>- Parallel </li></ul><ul><li>- Serial </li></ul><ul><li>For parallel interface, we use a standard 36 pin centronics interface. </li></ul><ul><li>This interface has </li></ul><ul><li>- 25 pin D type female connector to the computer side </li></ul><ul><li>- 36 pin Amphenol type connector to printer side </li></ul>
  10. 10. DMP
  11. 11. DMP <ul><li>Two types of print heads </li></ul><ul><li>-With cable </li></ul><ul><li>-Without cable. </li></ul><ul><li>With cable </li></ul><ul><li>The head cable is directly soldered to the print head </li></ul><ul><li>If the cable becomes faulty you have to throw the complete head. </li></ul><ul><li>Hence, it is not preferable. </li></ul><ul><li>e.g. TVSE series except LSP100 </li></ul>
  12. 12. DMP <ul><li>Without cable </li></ul><ul><li>The head cable is connected to head through a connector. </li></ul><ul><li>If the cable is gone faulty, then it can be easily replaced. </li></ul><ul><li>Hence, it is preferred. </li></ul><ul><li>eg. EPSON series except FX105 MX80 </li></ul>
  13. 13. DMP <ul><li>This provides the movement for the print head. </li></ul><ul><li>It is having a base for head & two rails. </li></ul><ul><li>Over these rails the base or ‘carriage’ moves horizontally from left to right & back. </li></ul>
  14. 14. DMP <ul><li>Carriage motor is basically a stepper motor. </li></ul><ul><li>Carriage motor provides the actual force to move the carriage </li></ul>
  15. 15. Ink jet printer <ul><li>The ink tiny droplets of ink onto the paper </li></ul><ul><li>Its available in black and white and color printer </li></ul><ul><li>300 dpi, 16 pages per minute (PPM) </li></ul>
  16. 16. Ink jet printer
  17. 17. <ul><li>The most popular way of connecting a printer to a computer is through the parallel port (LPT) </li></ul><ul><li>Universal Serial Bus (USB) port. </li></ul><ul><li>small computer system interface (SCSI) port. </li></ul>
  18. 18. Ink jet Printer <ul><li>512 KB random access memory (RAM) to 16 MB RAM, depending on the model. </li></ul><ul><li>If the trigger is not depressed, the printer lights up the &quot;Out of Paper&quot; LED and sends an alert to the computer </li></ul>
  19. 19. Laser Printer <ul><li>1200 dots per inch </li></ul><ul><li>17-19 pages per minute for text and 6 to 7 pages per minute for graphics. </li></ul><ul><li>~600 and ~1,000 volts. </li></ul><ul><li>Toner (~200 and ~500 volts) </li></ul><ul><li>Process </li></ul><ul><li>1.Clean 4.Develop </li></ul><ul><li>2.Charge 5.Transfer </li></ul><ul><li>3.Write 6.Fuse </li></ul>
  20. 20. Laser printer
  21. 21. Laser process <ul><ul><li>1. Cleaning: Excess toner is scraped from the photoelectric drum. </li></ul></ul><ul><ul><li>2. Conditioning : A uniform -600 volt charge is placed on the photoelectric drum by the primary corona. </li></ul></ul><ul><ul><li>3. Writing: Laser diodes write an invisible electric image on the photoelectric drum by causing the drum surface to be less negative wherever the laser beam hits. </li></ul></ul>
  22. 22. Laser process <ul><ul><li>4. Developing : This is where the transfer roller places the toner on the drum. The toner sticks to the areas that have had the electric charge lessened due to the laser beam. </li></ul></ul><ul><ul><li>5 . Transfer : The secondary corona uses a positive charge to attract the toner from the drum to the paper. The Paper gets charged by corona too. </li></ul></ul><ul><ul><li>6. Fusing : The toner is then melted into the paper </li></ul></ul>
  23. 23. Printer
  24. 24. <ul><li>THE END </li></ul>