Driver 1 rotates about fixed axis A and carries pin a mounted on slider 4 which moves along a slot of driver 1. Slider 4 is connected to driver 1 by spring f. Pin a consecutively engages straight radial slots d of Geneva wheel 2 which rotates about fixed axis B. Pin a simultaneously slides along curvilinear slot n of upright 3. Slots d are located symmetrically at angles of 90° between the axes of adjacent slots. Driver 1 has concentric locking surface b which engages concave locking surfaces e of Geneva wheel 2 to prevent its unintentional rotation during its idle periods. The shape of slot n is designed so that for rotation of driver 1 at uniform velocity, Geneva wheel 2 also rotates at uniform velocity during its rotation periods tᵣ. Geneva wheel 2 has four rotation periods tᵣ and four idle periods tᵢ. The time of one revolution of driver 1 is T=tᵣ+tᵢ. The angles of rotation of driver 1 corresponding to an idle and to a rotation period of Geneva wheel 2 are ϕᵢ=270° and ϕᵣ=90°. The angle of rotation of Geneva wheel 2 to each revolution of driver 1 is ϕ_G=90°. The rotation and idle factors are p=tᵣ/T=0.25 and q=tᵢ/T=0.75. The working time coefficient is k=p/q=0.33. Driver 1 and Geneva wheel 2 rotate in opposite directions.
$2630$PG,GW$