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  1. 1. PRINTERS 20 nd June 2011
  2. 2. INTRODUCTION <ul><li>What is a Printer? </li></ul><ul><ul><li>It is an output device that produces text and graphics on paper. </li></ul></ul><ul><li>Function - To present data on paper </li></ul><ul><li>Types of Printer:- </li></ul><ul><ul><li>Inkjet Printer </li></ul></ul><ul><ul><li>Laser Printer </li></ul></ul><ul><ul><li>Dot-Matrix Printer </li></ul></ul><ul><ul><li>Plotter </li></ul></ul>
  3. 3. Dot Matrix Printer <ul><li>Consists of a print head with a number of pins. </li></ul><ul><li>These pins move in and out to print a character in the form of dots. </li></ul><ul><li>Printer speed - 100-800 per second (cps) </li></ul><ul><li>Uses fanfold paper </li></ul><ul><ul><li>A fanfold paper is a long continuous paper with holes at the edges </li></ul></ul><ul><li>Printing quality depends on the printer resolution </li></ul><ul><ul><li>Printer resolution measures how closely the printer can print dots </li></ul></ul><ul><ul><li>Measured in terms of dots per inch (dpi) </li></ul></ul><ul><li>Two types of printer quality </li></ul><ul><ul><li>Draft quality - uses low resolution </li></ul></ul><ul><ul><li>Near letter quality - uses high resolution </li></ul></ul>
  4. 4. Advantage and Disadvantage <ul><li>Advantage </li></ul><ul><ul><li>It is cheap </li></ul></ul><ul><li>Disadvantage </li></ul><ul><ul><li>Very noisy when printing </li></ul></ul>
  5. 5. Ink Jet Printer <ul><li>Consists of a print head with a number of tiny nozzles. The ink is pushed through the tiny nozzles onto the paper to form tiny dots </li></ul><ul><li>Uses A4 papers </li></ul><ul><li>Printer speed - 2 to 10 pages per minute (ppm) </li></ul><ul><li>Printer Resolution </li></ul><ul><ul><li>Draft quality </li></ul></ul><ul><ul><li>Near letter quality - better quality than dot matrix because ink is darker </li></ul></ul>
  6. 6. Advantages and Disadvantage <ul><li>Advantages </li></ul><ul><ul><li>Quiet when printing </li></ul></ul><ul><ul><li>Lightweight </li></ul></ul><ul><ul><li>Quite reliable </li></ul></ul><ul><li>Disadvantage </li></ul><ul><ul><li>Expensive than dot matrix printer </li></ul></ul>
  7. 7. Laser Printer <ul><li>It prints images by transferring ‘ink powder’ onto a piece of paper using a laser beam </li></ul><ul><li>Printer speed - 4 to 17 pages pages per minute (ppm) </li></ul><ul><li>Printer resolution </li></ul><ul><ul><li>Draft quality </li></ul></ul><ul><ul><li>Near Letter quality </li></ul></ul><ul><ul><li>Letter quality </li></ul></ul>
  8. 8. Advantages and Disadvantage <ul><li>Advantages </li></ul><ul><ul><li>Prints faster </li></ul></ul><ul><ul><li>Better quality </li></ul></ul><ul><li>Disadvantage </li></ul><ul><ul><li>Very expensive </li></ul></ul>
  9. 9. Differences between the Printers
  10. 10. Images are transformed onto a piece of paper with ‘mix powder’ using a laser beam A print head with a no of tiny nozzles. It uses melted wax in cartridge packing to form tiny dots It has a print head with a number of pins. These pins move and form dots on paper MECHANISM Slightly popular Very Popular Less dependent POPULARITY Toner Ink Cartridge Ribbon USED Silence Quiet Noisy NOISE LEVEL 4-17ppm (Fastest) 2-10ppm (Faster) 100-400cps (Slow) SPEED Letter quality Near letter quality Low/Draft quality RESOLUTION Heavy Lighter Bulky SIZE Expensive Cheaper depends on quality and speed Cheap COST Laser Printer InkJet Printer Dot Matrix Printer Printer Type
  11. 11. Plotter <ul><li>A device that draws picture on paper based on commands from a computer </li></ul><ul><li>It differ from printers because plotter draws lines using a pen </li></ul><ul><li>It can produce continuous lines, whereas printers can only simulate lines by printing a closely spaced series of dots </li></ul><ul><li>Function - moves special pens across the paper to create a drawing or design </li></ul><ul><li>Uses by Engineers, Architects and Designers </li></ul>
  12. 12. Types of Plotter <ul><li>Three types of Plotter </li></ul><ul><ul><li>Flatbed Plotters </li></ul></ul><ul><ul><ul><li>Hold the paper still while the pens move </li></ul></ul></ul><ul><ul><li>Drum Plotters </li></ul></ul><ul><ul><ul><li>Roll the paper over a cylinder </li></ul></ul></ul><ul><ul><li>Pinch-Rollers Plotters </li></ul></ul><ul><ul><ul><li>Mixture of the two types above </li></ul></ul></ul>
  13. 13. Advantages and Disadvantages <ul><li>Advantages </li></ul><ul><ul><li>Speed - Faster than other printers </li></ul></ul><ul><ul><li>Precision - Allows to print more precise lines </li></ul></ul><ul><ul><li>Versatility -It can be hooked up to any computer </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Can take over half an hour to produce a print, depending on the size and complexity of the image produced </li></ul></ul><ul><ul><li>Not able to print photo-quality images </li></ul></ul><ul><ul><li>Cost a bit more than other printers </li></ul></ul><ul><ul><li>Very large equipment </li></ul></ul>