Driver 1 rotates about fixed axis A and carries two pins a which consecutively engage straight radial slots d and f of Geneva wheel 2. Geneva wheel 2 rotates about fixed axis B
and its slots d and f are located symmetrically at angles of 90° between the axes of adjacent slots d and f. Driver 1 has concentric locking surfaces b and c which engage concave locking surfaces e and n of Geneva wheel 2 to prevent its unintentional rotation during its idle periods. The radii of pins a are not equal (A͞D≠A͞E). When driver 1 rotates continuously at uniform velocity, Geneva wheel 2 rotates intermittently at nonuniform velocity and has four rotation periods and four idle periods. The rotation periods, as well as the idle periods, change after each half revolution of driver 1. Driver 1 and Geneva wheel 2 rotate in opposite directions.
$2628$PG,GW$