Pin wheel 1 rotates about fixed axis A and carries pin a which consecutively engages straight radial slots d of Geneva wheel 2. Geneva wheel 2 rotates about fixed axis B and its slots are located symmetrically at angles of 90° between the axes of adjacent slots. Pin wheel 1 has annular locking slot c which engages two oppositely located pins b on Geneva wheel 2 to prevent its unintentional rotation during its idle periods. Pins b are located at equal distances from axis B and symmetrically with respect to slots d. When pin wheel 1 rotates continuously at uniform velocity, Geneva wheel 2 rotates intermittently at nonuniform velocity with four rotation periods and four idle periods. The angle of rotation of Geneva wheel 2 to each revolution of pin wheel 1 is ϕ_G=90°. Pin wheel 1 and Geneva wheel 2 rotate in opposite directions.
$2644$PG,GW$