The lengths of the links comply with the conditions: A͞B=A͞’B’ and B͞C=B͞'C'. Weights 2 and 3 are of equal weight. When the speed of rotation of shaft 1 changes, weights 2 and 3 move either toward or away from each other, moving link 6 along shaft 1 either downward or upward.
$1635$SC,G$