Driver 1 rotates about fixed axis A and carries pin a which consecutively engages slots b in spherical Geneva wheel 2. Geneva wheel 2 rotates about fixed axis B and its slots b are located symmetrically at angles of 90° between adjacent slots. Driver 1 has concentric member d which engages concave surfaces e of Geneva wheel 2 to prevent its unintentional rotation during its idle periods. When driver 1 rotates continuously at uniform velocity, Geneva wheel 2 rotates intermittently at nonuniform velocity.
$2650$PG,GW$