1. 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.

19. Thank You!!!