The details about how this Mechanism operates and its application in various machines.

1. BY,
AMAR M. BORKUTE

2.  Whitworth quick return mechanism is a mechanism which is used to
transform the rotation motion of a crank or crankshaft to the
rectilinear reciprocating motion of a piston or plunger or ram.
Sir Joseph
Whitworth
 Sir Joseph Whitworth born in Stockport, Cheshire, on the 21
December 1803 invented this noteworthy mechanism which is used
to drive the cutting tool on shaping machines.
 Thus the mechanism bears his name i.e. “Whitworth quick
return mechanism.”

3. WORKING
 In Whitworth quick return mechanism, the link CD (link 2) forming the turning
pair is fixed, as shown in Fig. The link 2 corresponds to a crank in a
reciprocating steam engine
 The driving crank CA (link 3) rotates at a uniform angular speed
 The slider (link 4) attached to the crank pin at A slides along the slotted bar PA
(link 1)

4.  The connecting rod PR carries the ram at R to which a cutting tool is fixed.
The motion of the tool is constrained along the line RD produced, i.e. along a
line passing through D and perpendicular to CD.
 When the driving crank CA moves through an angle α in the Anti-clockwise
direction, the tool moves from the left hand end of its stroke to the right hand
end.
 Now when the driving crank moves through an angle β in the clockwise
direction, the tool moves back from right hand end of its stroke to the left hand
end.

5. Link 3 – Driving Crank
Link 1– Slotted Bar
Link 4 – slider
Link 2- Fixed link
DIFFERENT LINKS OF WHITWORTH QUICK RETURN
MECHANISM

6. ANIMATION OF THE WORKING OF MECHANISM

7.  In Fig,
 Link 1- The Slotted bar
 Link 2 – The Fixed Link
 Link 3 – Driving Crank
 Link 4 – Slider

8. APPLICATION:
1.Shaper Machine

9. 2.Slotter Machine