The slider-crank mechanism is shown in figure. It has link 1 as fixed and link 2 is crank, link 3 is connecting rod, link 4 is slider. If in place of link 1, link 2 is get fixed and link 3 become crank with link 1 to rotate about 'O' along with slider 4 which reciprocates. Then the resulting mechanism will be:

Explanation:

Whitworth Quick Return Mechanism

• The Whitworth Quick Return Mechanism is a mechanical device used to convert rotational motion into reciprocating motion. This mechanism is particularly known for its ability to produce a faster return stroke compared to the forward stroke, making it highly efficient for certain applications such as in shaping and slotting machines.
• The Whitworth Quick Return Mechanism consists of a rotating crank, a slotted lever (link), and a slider. When the crank rotates, it drives the slotted lever. The slider, which is attached to the tool or working element, moves back and forth due to the motion of the slotted lever. The geometry of the mechanism ensures that the time taken for the forward stroke is longer than the time taken for the return stroke.
• By fixing link 2 and making link 3 the crank, the resulting motion and characteristics align with the quick return mechanism, where the return stroke is quicker than the forward stroke. This forms Whitworth Quick Return Mechanism.

Advantages:

• Increased efficiency due to the faster return stroke, reducing the overall cycle time of the machine.
• Simplicity in design and ease of implementation in various mechanical systems.

Disadvantages:

• Non-uniform motion of the slider, which might not be suitable for applications requiring constant speed.
• Potential for increased wear and tear due to the quick motion during the return stroke.

Applications: The Whitworth Quick Return Mechanism is commonly used in shaping machines, slotting machines, and other machinery where a faster return stroke enhances productivity.