1.  By…
 Nilima adhav
 Vaibhai bhosle
 Kaveri more
 Nikita dongre

2.  What is printer ?
 Types of printer.
 Printer charateristics.
 Dot matrix printer.
 Working of dot matrix printer.
 Advantages & disadvantages.
 Inkjet printer.
 Working of inkjet printer.
 Laser printer.
 Block diagram & working of laser printer.
 Other types of printer.
 Future..

3.  A printer is an output device that produces text and
graphics on paper.
 Many printers are primarily used as local peripherals. And
are attached by a printer cable or, in most newer
printers, a USB cable to a computer which serves as a
document source.
 IN addition, a few modern printer can directly interface
to electronic media such as memory card, or to image
capture devices such as digital camera.

4. Printers
Impact Printers Non-Impact Printers
Daisy
wheel
Dot-
Matrix
Inkjet Thermal laser

6. 1. speed.
2. Quality.
3. Character set.
4. Interface.
5. Buffer size.
6. Print Mechanism.
7. Print Mode.
8. Print Size.
9. Print Direction.

7.  The term dot matrix is specifically used for impact
printer that use a matrix of small pins to create precise
dots.
 Each dot is prodused by tiny metal rod, also called as
wire or pins. which is driven forward by the power of a
tiny electromganet or solenoid, either directly or through
small levers.
 Such printers would have either 7 or 9 or 18 or 24pins on
the print head.24 pins print head were able to print at
higher quality.

9.  Interface logic:-This takes signals from PC i.e. data signal
and control signal.
 Data buffer:-stores data from pc . then send to Rom for
getting dot information of perticular character then send
dot pattern to the print head.
 Front panel & circuit:-used to select print mode &
perform self-test.
 Timing & control logic:-used to generate control signals
for printmechanism & interface logic.

10. Head coil drivers & head pins:-controls the
firing of different needles(pins) at appropriate
time corresponding to the matrix pattern of
the character to be printed.
Paper feed motor & paper feed motor drive:-
this is four-pase stepper motor ,moves the
platen by a fixed step. this moves paper
vertically.
Sensors: 1)Head home sensor : it detects
wheather the head carriage is at the left
margin or not.2)paper out sensor : provides
signals when there is no paper in the printer

11.  Advantage:-
 Inexpensive.
 Small size.
 Light weight.
 Versatile i.e.it produced graph, charts &pictures.
 Disadvantages:-
 They cannot be used continuously for more than one hour.
 Quality is not so good.
 These printers are noisy.
 Requires more servicing.

12.  An inkjet printer is a type of computer thet reproduces a
digital image by propelling variably-sized droplets of
liquid material (ink) onto a page.
 Desktop inkjet printers, as used in offices or at home,
tend to use aqueous inks based on a mixture of water
,glycol and dyes or pigments.
 A typical ink-jet printer provides a resolution of 300
Dots per inch , although some newer models offer higher
resolutions.

14.  An ink-filled print cartridge attached to the inkjet’s
 The print head is made up of small ink-filled chambers ,
attached to a nozzle
 Resistor heats a thin layer of ink at the bottom of the
chamber to more than 900 fahrenheit

15.  As this vapor bubble expands , it pushes the ink
 The ink droplet overcomes the surface tension of the ink
 As the resistor cools,the bubble collapses
 An electrical pulse flows through a heating element

16.  Advantages:-
 Silent in operation.
 High quality output.
 Support color printing.
 High speed.
 Disadvantages:-
 High cost.
 It requires periodic maintenance.
 Not support multi-stationary.

17.  Laser printer are non-impact printer which can print text
and images in high speed & high quality resolution,
ranging from 600 to 1200 dpi.
 A laser eam project on image of the page to be printed
onto an elecrycally charged rotating drum coated with
selenium.
 Laser Printer produce very high-quality print and are
capable of printing an almost unlimited variety of fonts.

18. Block diagram:-

19.  System interface
 Control system
 Image formation system
 Paper pick-up/delivery system
1)System interface:-Manipulate or convert the incoming
data in proper format that the printer can use to create
the image on the photo conductive drum

20.  Communicating with the DC controller assembly
 Store font information
2)Control system:-
 Coordinating all the activities of the printer
,required for the printing process
 To drive the laser beam
 Also shares machine status information with the
interface so that proper message is displayed on
control panel
3) Image formation system :- It consist of 6 steps

21. 1. Clearing
2. Conditioning
3. Writing
4. Developing
5. Transfer
6. Fusing
4)Paper pickup/delivery:-
 Picking the paper from input tray
 Delivering the paper to the image formation system at the
right time
 Feeding it to fusing station

22.  Advantage:-
 High quality printing
 High speed
 Support text and graphics
 Quite in operation as no mechanical motion is involved.
 Disadvantages:-
 The cost is more
 Cost of toner is high
 The expert person is required for maintdnance

23.  Daisy Wheel printer
 Line printer
 Drum printer
 Thermal printer
 Thermal-wax transfer printer
 Thermal-dye diffusion printer