The lengths of the links comply with the conditions: A͞B=D͞C and B͞C=A͞D. Connecting rod 1 is attached through turning pair B to crossed-crank linkage ABCD. Connecting rod 1 reciprocates slider 2. When crank 3 rotates at uniform velocity about fixed axis D, crank 5 rotates about fixed axis A at nonuniform velocity, transmitting complex motion to slider 2. Uncertainty of motion of crossed-crank linkage ABCD in its extreme (dead centre) positions is eliminated by the provision of pins F and E on link 4 that enter safety stops G and H.
$1513$SC,6L$