Mechanisms are an important part of everyday
life. They allow us to do simple things like switching on lights, turning tops,
and opening doors. They also make it possible to use escalators and lifts,
travel in cars, and fly from continent to continent.
Mechanisms play a vital role in industry. While
many industrial processes have electronic control systems, it is still
mechanisms that deliver the power to do the work. They provide the forces to
press steel sheets into car body panels, to lift large components from place,
to force plastic through dies to make pipes, etc.
All mechanisms involve some kind of motion. The
four basic kinds of motion are :
1-Rotary : Wheels, gears, and rollers
involve rotary movement.
2-Oscillating : The pendulum of a clock
oscillates – it swings backwards and forwards.
3-Linear : The linear movement of a paper
trimmer is used to cut the edge of the paper.
4-Reciprocating : The piston in a combustion
engine reciprocates.
Many mechanisms involve
changing one kind of motion into another type. For example, the reciprocating
motion of a piston is changed into a rotary motion by the crankshaft, while a
cam converts the rotary motion of the engine into the reciprocating motion
required to operate the valves.
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