Screw 1 is connected by turning pair C to crank 2 and by screw pair D to member 3 which is connected by sliding pair E to crank 2. Length (throw) A͞B of crank 2 is changed by adjusting member 3 along axis Aa. This is accomplished by turning screw 1 about axis Aa. Point B of the crankpin can be adjusted to either side of point A.
$496$SL,LL$