Driver 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 d are located symmetrically at angles of 60° between the axes of adjacent slots. Driver 1 is rigidly at tached to cam b which actuates roller c, periodically turning two-arm lever 4 about fixed axis D. When driver 1 turns clockwise from the position shown, cam b turns lever 4 counterclockwise, withdrawing roller e from a slot d of Geneva wheel 2. Then driver 1 turns Geneva wheel 2 when its pin a engages the next slot d of the wheel whose rotation continues until roller e enters the following slot d and pin a of driver 1 turns out of engagement with Geneva wheel 2. After this, Geneva wheel 2 remains stationary until driver 1 reaches the initial (shown) position again.
$2633$PG,GW$