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DEPARTMENT OF TECHNICAL EDUCATION,
ANDHRA PRADESH.
• Name : M.Srinivasulu
• Designation : Senior Lecturer
• Branch : Mechanical Engg.
• Institute : 075, GMR. Polytechnic, Gajwel,
Medak Dist.
• Semester : VI- Semester
• Subject : CAD / CAM
• Code No : M-605
• Topic : CAD/CAM
• Duration : 50 mins.
• Sub Topic : Output Devices
• Teaching Aids : Photos, Diagrams, Animations

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Duration to cover each objective
• Introduction to output devices 05min
• What is an output device ? 05min
• Output devices 30min
• Summary & questions 10min

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Objectives
On completion of this period you would be
able to know :
• What is an output device ?
• Types of output devices

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Do you know about Output devices ?

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Fig : 1

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Can you name the different output devices ?

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• It is a device which communicates the output
of a computer to the user
What is an output device?

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Types of Output Devices
1. Pen Plotters
a) Drum Plotters
b) Flat bed Plotters
2. Hard copy units
3. Electrostatic Plotters
4. Computer-Output-Microfilm (COM) Units

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1(a).Drum Plotters
• Consists of
-Cylindrical Drum
-Slide
-Pen
• Relative motion between pen and drum produces
Plot.
• Fast and Accurate
• Drawings of Unlimited length.
• Width of Drawing limited to length of Drum

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1(a).Drum Plotters
Fig : 2

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1(b). Flat bed Plotters
• Consists of
-Bridge with writing head
-Flat drawing surface
Motions:
X-co-ord. Bridge
Y-co-ord. Writing head
• Drawing surface horizontal or vertical.
• More expensive & slow but accurate
Fig : 3

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2. Hardcopy unit
• Makes copy of image displayed on CRT screen
• By exposing light sensitive paper
• Heated roller develops exposed paper
• Used for rough hard prints during
design
• Fast but not accurate Fig : 4

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3.Electrostatic Plotter
• Has series of styluses on a bar
• Printing is obtained by dots of activated styluses
• Placement of dots is coordinated with movement
of paper
• Fast and accurate
• Used for Unlimited, Continuous Drawings
• Density of styluses 200/Inch

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3.Electrostatic Plotter
Fig : 5

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4.Computer Output-to-Micro film (COM)
Units
• Re produces drawings on micro film to a scale
• Has large storage capacity
• Faster and accurate but costly

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4.Computer Output-to-Micro film (COM)
Units
Advantages:
• Huge Storage Capacity
• Very Faster
• Used in Industry to maintain No. of Drawings

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4.Computer Output-to-Micro film (COM)
Units
Dis-advantages:
• Equipment is Costly
• Quality is not good as Pen Plotter
• No Provision to write notes
• Not Suitable for Small/Medium Industries

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Summary
Output device : Gives desired output
Output devices:
1. Pen Plotter
2. Hard copy units
3. Electrostatic Plotter
4. COM Units

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Summary
Pen plotters
1. Drum plotter
2. Flat bed plotter

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Quiz
A. Input Device
B. Output Device
C. Display Device
D. Hardcopy Unit
1. A Pen Plotter is a

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Quiz
2. Accurate and good quality drawings can be
produced by
A. Pen Plotter
B. Digitiser
C. Hardcopy Unit
D. Light Pen

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Quiz
3. Which produces quality drawings at faster rate
A. Pen Plotter
B. Hardcopy Unit
C. Electrostatic Plotter
D. Digitizer

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Quiz
4. Which of the following is an output device
A. Light Pen
B. Electronic Tablet
C. Digitizer
D. COM Units

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Frequently Asked Questions
1. What are the different types of output devices?
2. Differentiate between drum plotter and flat bed plotter.
3. Explain the working of electrostatic plotter with a sketch.
State its advantages.