Face cam 1 rotates about fixed axis D and has profiled groove e. Follower 2 oscillates about fixed axis A and carries roller c which rolls and slides along groove e. Ball 3, mounted on follower 2, imparts a supplementary reciprocating axial motion to link 4 and shaft B. Their stroke increases with the distance of ball 3 from axis A. The position of ball 3 is adjusted by screw 5 which is rotated by handwheel 6 through universal joint 7. Shaft B and link 4 are rotated by a separate mechanism (not shown). Ball 3 is kept in constant contact with link 4 because it is between dish members a and b of the link.
$3231$CmL,LL$