3. Inversion - Third type:
The Third-Inversion is done by fixing the Crank- as shown in the Fig. below. This is an inversion of Slider-Crank mechanism, you may recall, was discussed while discussing Grashof-type-Chains.
This is the inversion on which Whitworth-Quick-Return-Mechanism is based on.The Whitworth-mechanism is widely used in Shaping-Machines. In this inversion the Link-3, of the Fig. below, is the Driver which rotates at a uniform angular velocity. and makes the Rocker oscillate. The point 'D' of the Rocker is connected to the Ram with the help of Link-5. As the Rocker moves back and forth it moves the slider back and forth too.
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