WELCOMEMini project

SUBMITTED BY

Abhishek Prasad

MECH A

FOUR BAR CHAIN MECHANISM

A four bar chain is the most fundamental of the plane kinematic chains. It is preferred as a mechanical device for the mechanism and control of motion due to simplicity and versatility.

They are connected in the form of quadrilateral by four pin joint.

LINKAGES

A LINK can be defined as a member or a combination of members of a mechanism, connecting other members and having relative motion among them.

Generally the linkages are 1st fixed link 2nd connecting link 3rd crank link 4th rocker

SIMPLE PIC OF FOUR BAR CHAIN

FOUR BAR CHAIN b c

a d

PAPER CUTTING OR WOOD CUTTING CHAIN MECHANISM Generally we are having the same

linkages combination as shown in video its working...

Two wheels are placed with the correct ratio of dia.. Or expected ratio...

1st is driving wheel may connected to small motor or rotated by human effort.

2nd driven wheel or flywheel connected with belt to driving wheel and also having crank link connected to the outer rim of wheel.

MECHANISM

FIXED LINK

It act as a supporting link which is fixed to the basement, as it also provides the required movement of rocker arm as shown in video...

Generally the fixed link supports the motion also with the help of external links it controls the motion along a direction.

MECHANISM

CRANK It is a link which rotate with the rotation

of 360degree at one end linked with connecting rod and other to the wheel as seen in video...

As the wheel rotate the crank rotate and transmit the rotating power to the connecting link for further transmission and give out an output.

MECHANISM

CONNECTING ROD As seen in diagram it act as link which

transmit the motion forward to the rocker arm as it is linked with crank arm.

The rotation of crank gives the motion to the connecting rod such as oscillating or to and fro with oscillation.

MECHANISM

ROCKER ARM OR ROCKER LINK

As the motion is transmitted from connecting rod the rocker arm further transmit the motion to the final output.

The motion can be the reciprocating or to and fro, as per the requirement of application.

APPLICATION

Generally this four bar chain mechanism is having lots of application

deep boring machines In locomotives hand pump Crank and slider mechanism used in

lathes..

THANK YOU