The document provides an overview of printers, defining them as external hardware devices that generate hard copies of data. It details the history of printing technology from the invention of electrophotography in 1938 to the development of various printer types such as impact (dot matrix and daisy wheel) and non-impact (inkjet, thermal, laser) printers, highlighting their mechanisms, advantages, and disadvantages. Key features of each printer type are described, including speed, print quality, and applications.

1. Printers
Prepared by: Mihir Bhavsar (196170307008)
Naimish Bhuva (196170307068)

2. What is Printers ?
• An external hardware device responsible for taking computer data and
generating a hard copy of that data.
• Printers are one of the most commonly used peripherals and they print text
and still images on the paper.

3. Introduction
• In 1938, Chester Carlson invented a dry printing process called
electrophotography commonly called a Xerox.
• In 1953, the first high-speed printer was developed by Remington-Rand for
use on the Univac computer.
• In 1992, Hewlett-Packard released the popular LaserJet 4, the first 600 by
600 dots per inch resolution laser printer.

4. Types of Printers
Printers
Impact Non-Impact
dot Matrix
DaisyWheel
Laser
Inkjet
Thermal

5. Impact Printer
• These printers have a mechanism
that touches the paper to create an
image.
• There printers work by banging a
print head containing a number of
metal pins which strike an inked
ribbon placed between the print
head and the paper.

6. Daisy Wheel Printer
• A daisy wheel printer is basically an impact printer consisting of a wheel and
attached extensions on which molded metal characters are mounted.
• A daisy wheel printer produces letter quality print and it can’t produce
graphics output.
• In a daisy wheel printer, a hammer presses the wheel against a ribbon which
in turn makes an ink stain on the paper in the form of a character mounted
on the wheel extensions.
• Its printing speed is also very slow ,i.e. less than 90cps

7. Image of Daisy Wheel Printer

8. Dot Matrix Printer
• The term dot matrix refers to the process of placing dots to form an image.
• Its speed is usually 30 to 550 characters per second (cps).
• This is the cheapest and the most noisy printer and has a low print quality.
• Dot Matrix were 1st introduced by Centronics in 1970.
• The dot matrix forms images one character at a time as the print head
moves across the paper.
• Uses tiny pins to hit an ink ribbon and the paper much as a typewriter does.

9. Image of Dot Matrix Printer

10. Non-Impact Printer
• These printers create an image on
the print medium without the use
of force.
• They don’t touch the paper while
creating an image.
• Non-impact printers are much
quieter than impact printers as
they don’t strike the paper.

11. Ink-jet Printer
• It is a non-impact printer producing a high quality print.
• A standard Inkjet printer has a resolution of 300dpi (dots per inch).
• Inkjet printers were introduced in the later half of 1980s and are very
popular owing to their extra-ordinary performance.
• Print head having four ink cartridges moves.
• Software instructs where to apply dots of ink, which color and what
quantity to use.

12. Image of Ink-jet Printer
Color cartridge showing Inkjet nozzles

13. Thermal Printer
• Thermal printers are in-expensive printers mostly used in fax machines.
• TheThermal printers are further classified into two types.
(1) Electro thermal printers
(2)ThermalWax printers
• Thermal printers use heated pins and ribbons with different color bands.
• These printers contain a stick of wax like ink.The ribbon passes in front of a
print head that has a series of tiny heated pins.
• The pins cause the wax to melt and adhere to the paper and when
temperature reaches to a certain level, it is hardened.

14. Image ofThermal Printer
A fax machine using a
Thermal printer.

15. Laser Printer
• Laser printing is an electrostatic digital printing process.
• It produces high-quality text and graphics by repeatedly passing a laser
beam back and forth over a negatively charged cylinder called a "drum" to
define a differentially charged image.
• Laser printers can print much faster than inkjet printers can.
• Most are equipped with high-capacity paper trays, so they can print more
pages at a given time.They're also built to handle the printing of thousands
of pages per month without succumbing to wear-and-tear.
• Laser printers use microscopic ink particles in a powdered form known as
toner. Once heated by the fuser unit, the toner melts allowing it to be fused
to the paper fiber under pressure.

16. Images of Laser Printer

17. ThankYou 