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