Link 1 rotates about fixed axis D and is connected by turning pair C to link 2 which moves in slider 4. Slider 4 turns about fixed axis A which is located between axes D and B. Link 2 carries pin a which consecutively engages straight radial slots d of Geneva wheel 3. Geneva wheel 3 rotates about fixed axis B and its slots d are located symmetrically at angles of 120° between the axes of adjacent slots. Link 1 has concentric locking surface b which engages concave locking surfaces e of Geneva wheel 3 to prevent its unintentional rotation during its idle periods. The time of one revolution of link 1 is T=tᵣ+tᵢ. The angles of rotation of link 1 corresponding to an idle and to a rotation period of Geneva wheel 3 are ϕᵢ=300° and ϕᵣ=60°. The angle of rotation of Geneva wheel 3 to each revolution of link 1 is ϕ_G=120°. Point E of link 2 describes limacon q. Therefore, when link 1 rotates at uniform velocity, Geneva wheel 3 rotates at variable velocity with minimum velocity in the position in which the axis of slot d coincides with line BD. By changing length C͞E of link 2, different kinds of motion of Geneva wheel 3 can be obtained. Link 1 and Geneva wheel 3 rotate in opposite directions.
$2639$PG,GW$