Rocker arm 3 of four-bar linkage EBCD has three slots, b, c and d, of special profiles in which roller a of link 4 can slide. Link 4 oscillates about fixed axis A. The law of motion of link 4 can be varied by changing the position of the centre of rotation A and by inserting roller a into another slot (of different profile) in rocker arm 3. Dash lines show another possible position of link 4.
$1692$LC,5L$