The document describes a four-bar mechanism driven by an electric motor that operates a pinion and gear system with a sliding crank. This quick return mechanism is used in applications such as metal shearing, embossing, and shaping machines, providing advantages like automation, simplicity, and reduced idle time. Its design enables efficient operations like cutting and flattening materials.

3. ☛ It is a four bar mechanism
comprised of fixed link,
crank, pin sliding in the slot
and a sliding pair. Electric
motor runs the driving
pinion at a uniform speed.
Pinion transmits its motion
to gear. Gear has a pin on
its surface which is
confined to slide inside slot
of crank.
mechanism

8. components
DC motor

9. pinion

10. gear

11. Crank

12. sliding pair

13. screw and
bolt

14. Application of
quick return
mechanism
1. employed in
metal shearing
machine
2. in embossing
machine

15. 3. used in shaper
machine to flaten
the workpiece
4. used in
mechanical
actuator

16. Advantage :-
1. The process is automated.
2. The construction of mechanism is not
complicated.
3. it can perform operations like cutting
flatening etc.
4. the idle time is reduced because of the
fast returning stroke.