Rocker arm 8 of four-bar linkage DEFG is designed as a slotted link with a circular slot in which slider 3 moves. Worm 6 rotates about fixed axis A-A and turns worm wheel segment 7 about fixed axis B. This changes the position of point C of link 9, and thereby changes the stroke of slider 3 in slot a. Link 10 is connected by turning pairs H and K to slider 3 and to link 5 which is designed as a housing with internal wedge-shaped recesses containing balls 4. When crank 1 rotates about fixed axis D, intermittent clockwise rotation is transmitted to link 2 by means of an overrunning clutch consisting of balls 4 and housing 5. The angular velocity of this motion can be varied by turning worm 6.
$1830$LR,ML$