Crank and slotted link mechanism
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Crank and slotted Lever quick return mechanism
It finds application in shaping machine, slotting machine, rotary internal combustion engine.
In this mechanism link corresponding to the connecting rod (AC) is fixed. The crank CB (in the fig below) revolves about the fixed center C. A slider attached to the crank pin at B slides along the slotted lever AP. This makes the slotted lever oscillate about the pivoted point A
A short link PQ transmits the motion from AP to the arm which reciprocates with the tool along the line of stroke.
We see that the angle β made by the forward or cutting stroke is greater than the angle α described by the return stroke. Hence the name quick return mechanism...
Time of cutting stroke = β
Time of return stroke α

It finds application in shaping machine, slotting machine, rotary internal combustion engine.
In this mechanism link corresponding to the connecting rod (AC) is fixed. The crank CB (in the fig below) revolves about the fixed center C. A slider attached to the crank pin at B slides along the slotted lever AP. This makes the slotted lever oscillate about the pivoted point A
A short link PQ transmits the motion from AP to the arm which reciprocates with the tool along the line of stroke.
We see that the angle β made by the forward or cutting stroke is greater than the angle α described by the return stroke. Hence the name quick return mechanism...
Time of cutting stroke = β
Time of return stroke α

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