Circular gear 1 rotates about eccentrically located fixed axis A and meshes with oval gear 2 which rotates about fixed axis B. Gear 2 carries pin a which consecutively engages straight radial slots d of Geneva wheel 3. Geneva wheel 3 rotates about fixed axis C and its slots d are located symmetrically at angles of 90° between the axes of adjacent slots. Gear 2 has concentric locking surface b which engages concave locking surfaces e of Geneva wheel 3 to prevent its unintentional rotation during its idle periods. Geneva wheel 3 has four rotation periods tᵣ and four idle periods tᵢ. The time of one revolution of gear 2 is T=tᵣ+tᵢ. The angles of rotation of gear 2 corresponding to an idle and to a rotation period of Geneva wheel 3 are ϕᵢ=270° and ϕᵣ=90°. The angle of rotation of Geneva wheel 3 to each revolution of gear 2 is ϕ_G=90°. When gear 1 rotates at uniform velocity, gear 2 rotates at nonuniform velocity and transmits nonuniform rotation to Geneva wheel 3 with reduced rotation periods tᵣ. The rotation periods of Geneva wheel 3 can be varied by changing eccentricity m of gear 1. Gear 1 and Geneva wheel 3 rotate in the same direction.
$2631$PG,GW$