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Printers and its types

Ashok Raj
Ashok Raj

An external hardware device.Take computer data and generates a hard copy of that data. Peripheral device and print text and images.

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Printers and its Types
Printers
• An external hardware device.
• Take computer data and generates a hard copy of that data.
• Peripheral device and print text and images.
Impact Printers Non-Impact Printers
Daisy
wheel
Dot-
Matrix
Inkjet Thermal Laser
Printers
Impact Printer
• Have a mechanism that touches the paper to create an image.
• Works by banging a print head containing a number of metal pins which
strike an inked ribbon placed between the print head and the paper.
Non-Impact Printers
• Create an image on the print medium without the use of force.
• They don’t touch the paper while creating an image.
• Much quieter than impact printers as they don’t strike the paper.
Dot-Matrix Printers
• Places dots and forms a image
• Speed is usually 30 to 550 characters per second (cps).
• Cheapest and the most noisy printer and has a low print quality.
• Dot Matrix were 1st introduced by Centronics in 1970.

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Printers and its types

  • 2. Printers • An external hardware device. • Take computer data and generates a hard copy of that data. • Peripheral device and print text and images.
  • 3. Impact Printers Non-Impact Printers Daisy wheel Dot- Matrix Inkjet Thermal Laser Printers
  • 4. Impact Printer • Have a mechanism that touches the paper to create an image. • Works by banging a print head containing a number of metal pins which strike an inked ribbon placed between the print head and the paper.
  • 5. Non-Impact Printers • Create an image on the print medium without the use of force. • They don’t touch the paper while creating an image. • Much quieter than impact printers as they don’t strike the paper.
  • 6. Dot-Matrix Printers • Places dots and forms a image • Speed is usually 30 to 550 characters per second (cps). • Cheapest and the most noisy printer and has a low print quality. • Dot Matrix were 1st introduced by Centronics in 1970.
  • 7. Working of Dot-Matrix Printer  Bestows a matrix of pins, which are used to produce the characters on the page.  Pin types – 9 and 24 pins  9 pins is usually the fastest.  24 pins displays the highest resolution.  The ribbon sits between the print head and the paper.  Pins emerge from the print head, they press the ribbon into the paper.  Ribbon cartridges typically have a length of pre-inked fabric ribbon wound inside of them.  As the printer prints, it advances the ribbon and gradually uses it up, necessitating its replacement.
  • 8. Advantages of Dot-Matrix Printers  Cheap and easily available.  Make carbon copies of the print out unlike non-impact printers.  Printing costs are the low.  Printout fades gradually rather than coming to a halt suddenly.  Use paper continuously.  Maintenance cost is low.  Tolerate dirty and hot conditions as are found in industrial environments.
  • 9. Disadvantages of Dot-Matrix Printers  The output is not high resolution.  Color printout is limited  Printing speed is less.  Creates great deal of noise while the pins strike the ribbon to the paper.  Pins get bended easily destroying the print head.  Paper jamming can happen with any printer, fixing it here is not an easy task.  The density of barcodes is low and may fail to match user’s standards.
  • 10. Ink-Jet Printers • It is a non-impact printer producing a high quality print. • Has a resolution of 300dpi. • Newer models have further improved dpi. • Inkjet printers were introduced in the later half of 1980s.
  • 11. Working of Ink-Jet Printer  Print head having four ink cartridges moves .  Software instructs where to apply dots of ink, which color and what quantity to use.  Electrical pulses are sent to the resistors behind each nozzle.  Vapor bubbles of ink are formed by resistors and the ink is forced to the paper through nozzles.  A matrix of dots forms characters and pictures.
  • 12. Advantages of Ink-Jet Printers  Low cost  High quality of output, capable of printing fine and smooth details  Capable of printing in vivid color, good for printing pictures  Easy to use  Reasonably fast  Quieter than dot matrix printer  No warm up time
  • 13. Disadvantages of Ink-Jet Printers  Print head is less durable, prone to clogging and damage  Expensive replacement ink cartridges  Not good for high volume printing  Printing speed is not as fast as laser printers  Ink bleeding, ink carried sideways causing blurred effects on some papers  Aqueous ink is sensitive to water, even a small drop of water can cause  Cannot use highlighter marker on inkjet printouts
  • 14. Laser Printer • Popular type of personal computer printer. • Comes under non-impact type. • Drum is charged, it is rolled in toner, a dry powder type of ink. • The toner adheres to the charged image on the drum. • The toner is transferred onto a piece of paper and fused to the paper with heat and pressure.
  • 15. Working of Laser Printers  Information is sent to the printer memory, where the data is stored.  The printer begins to warm up.  The corona wire is heated up and get ready to pass its positive static charge to the drum.  Drum begins to roll, it received a positive charge across its whole surface.  Some have contain four drums, one for each colour – Cyan, Magenta, Yellow & Black.  The laser activates, and beams against a series of mirrors to reflect across the surface of the drum imprinting the shape of your print using an opposite negative electrical charge.
  • 16.  The toner cartridge and hopper sat next to the drums slowly releases positively charged carbon toner particles on to the drum as it turns.  The toner is attracted to any areas of negative charge leaving positively charged areas of the drum untouched.  The transfer belt rolls the paper through the printer giving it a positive charge.  As it passes the drum, the negatively charged toner is attracted to the page in the shape of your print.
  • 17. Advantages of Laser Printers  A laser printer requires no ink.  No ink means nothing to "dry up".  Laser printers are far cheaper to operate.  Laser printers may cost more up front, but the cost per page is as little as a tenth of what it is for inkjet printers.  Laser printers offer waterproof printing.  Print quality is better.
  • 18. Disadvantages of Laser Printers  Do have the advantage of cost savings on the back-end but can be much more expensive on the front end.  The fuser inside heats up to as high as 200 degrees Celsius.  Print on certain kinds of paper.  Not able to print the photographic paper through a laser printer.  The more expensive a laser printer is the faster it is.