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
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
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
A matrix of dots forms characters and pictures.
12. Advantages of Ink-Jet Printers
High quality of output, capable of printing fine and smooth details
Capable of printing in vivid color, good for printing pictures
Easy to use
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
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
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
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.