1. Printers & Ploters

2. What is a Printer?
A printer is an electromechanical device which converts
the text and graphical documents from electronic form to
the physical form. Generally they are the external
peripheral devices which are connected with the
computers or laptops through a cable or wirelessly to
receive input data and print them on the papers. A wide
range of printers are available with a variety of features
ranging from printing black and white text documents to
high quality colored graphic images.

3. *overview of printers
*daisy wheel printers
*dot matrix printer
*inkjet printer
*laser printer
*other high quality printers

4. Overview of printers
*categorizing printers
*evaluating printers

5. –
 Printers fall in two categories
*impact printers user device to strike an inked
ribbon ,pressing ink from the ribbon on to
the paper.
*Non-impact printers use different methods
to place ink(or another substance) on the
page.

6.  When evaluating printers, consider four criteria
*image quality –measured in dots per inch(dpi).most
printers produce 300 to 600 dpi.
*speed-measured in pages per minutes(ppm) or
characters per seconds(cps).
*initial cost-consumer printers cost $250or less, but
professional printers can cost thousands of dollars.
*cost of operations-this refers to the cost of supplies
used by the printers.

7. Daisy Wheel Printers
Daisy wheel printers print only characters
and symbols and cannot print
graphics. They are generally slow with a
printing speed of about 10 to 75 characters
per second. By 1980 daisy wheel printers
were the dominant printers for quality
printing but since the prices of laser and
inkjet printers have declined and quality of
dot matrix printers has been improved, the
daisy wheel printers are now obsolete.

8. Daisy Wheel Printer

9.  how do dot-matrix printers work?
 performance

10.  These are a common type of impact printers.
 Its printer’s print head contains a cluster of
pins. The printer can push the pins out to
form patterns in rapid sequence.
 The pins press an inkedribbon against the
paper, creating an image.

11. Dot matrix diagram

12. Lower- resolution dot matrix
printers use 9 pins . Higher-
resolutions models have 24 pins.
Speed is measured in characters
per seconds. Some dot matrix
printers print 500 cps.

13.  How do ink jet printers work?
 performance

14.  These are an example of non impact
printers.
 These spray tiny droplet of ink onto the
paper.
 These are available for color and black
and white printing.

16.  Ink jet printers offer speed of(2-4 ppm) and
resolution of (300-600 dpi). Comparable to
low-end laser printer.
 Ink jet printers are inexpensive and have low
operating costs.

17. How do laser printers work?
Performance.

19.  These are non impact printers.
 They use heat and pressure to bond particles of toner
to paper.
 They are available for color and black and white
printing.

21. They provide resolution from 300-
1200 dpi and higher.
Black and white usually produce 4-
16 ppm.
Laser printers produce higher-
quality print than ink jet printers ,
but are more expensive.

22. Print shops and publishers use these printers
to create high-quality color images:
*Thermal-wax
*Dye-sublimation
*Fiery
*IRIS

23. Some special types of
printers
Photo Printer – These inkjet printers are
color printers that produce photo lab quality
pictures on photo papers. Although they can also
be used to print documents but they are specially
designed for printing the photo. They have a large
number of nozzles that can print very fine
droplets to enhance the image quality. They can
print a 4 x 6 inch photos directly from the digital
cameras without need of a computer.

24. Photo Printer

25. Dye Sublimation Printers – These are latest
innovative printers that are specially designed for high
quality photo printing. They magnetize the ink over a
charged paper to produce a very high quality picture.
These printers are suitable to photo hobbyists but are a
quite expensive.

26. Portable Printers - They are small light
weight inkjet or thermal printers specially
designed for the users to carry out with the
laptops while travelling. Generally these
printers have a lower quality for image printing
and higher cost because of its compact design.

27. Plotters

28. Plotter is a computer printer to print vector graphics. In the
past, plotters were used in applications such as computer-
aided design, though they have generally been replaced with
wide-format conventional printers. It is now commonplace to
refer to such wide-format printers as "plotters," even though
they technically aren't.
* Overview
Pen plotters print by moving a pen or other instrument across the surface of a piece
of paper. This means that plotters are restricted to line art, rather than raster
graphics as with other printers. Pen plotters can draw complex line art, including
text, but do so slowly because of the mechanical movement of the pens. They are
often incapable of efficiently creating a solid region of color, but can hatch an area
by drawing a number of close, regular lines.
Plotters offered the fastest way to efficiently produce very large drawings or color
high-resolution vector-based artwork when computer memory was very expensive
and processor power was very limited, and other types of printers had limited
graphic output capabilities.
Pen plotters have essentially become obsolete, and have been replaced by large-
format inkjet printers and LED toner based printers. Such devices may still
understand vector languages originally designed for plotter use, because in many
uses, they offer a more efficient alternative to raster data.

29. Types of a Plotters
There are three types of Plotters. They
are the Drum Plotter, The Flat bed
plotter and also the Inkjet Plotter. All of
the three types are explained explicitly
in the below mentioned lines. In the
past a plotter was widely used in
application such as the CAD, though it
doesn't happen that way anymore.

30. The Drum Plotter
Have you ever sat and spent time to ponder over what a plotter ever
did? Apparently, the Drum Plotter happens to be an output device.
In case of the Drum Plotters the pen is motioned on a single axis
track while the paper itself moves on a cylindrical drum in a perfect
bid to add another axis to the same. That's the reason why the size
of the graph is limited only by the width of the drum and can be of
any length.
The Flat bed Plotter
This is yet another output device associated with a plotter for it is one
of the three types of a plotter. Now in case of the Flat bed Plotter, the
paper is fixed on a flat surface while the pens are motioned to draw
the image. This is the plotter type which can successfully use several
colored pens for the purpose so that the effect is different from the
regular.

31. The Inkjet Plotter
This is the third kind of Plotter which is called as the Inkjet
plotter. It effectively pushes beads of ink directly onto the
medium. In Today's world, virtually all inkjets create colour. Low-
end inkjets make the most of the three ink colours (cyan,
magenta and yellow), but finally create a complex black that is
often mud-spattered. Four-color inkjets make use of the black ink
created for pure black printing alone.