Some mechanisms convert motion as well as transmitting it.
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Screw and nut:
This mechanism consists of a screw and a nut. The rotatory motion of the nut is converted to forward linear motion in the screw.
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Rack and pinion
This mechanism consists of a toothed wheel that meshes with a toothed bar. The rotatory motion of the pinion is converted to linear motion in the rack.
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Crank and slider
This mechanism consits of a rigid bar that is connected at one end to a crank.
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Cams
They are usually elliptical in shape. They are attached to a shaft and, as they rotate, they drive an element called the follower. A spring keeps the follower in permanent contact with the cam.
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Eccentric cam
It is a mechanism similar to a regular cam. Its consist of a wheel where the axis of rotation isn’t the geometrical centre. Its converts rotatory motion into linear reciprocating motion and is used older sewing machines.
Elías and Christian 