Driving link 1 rotates about fixed axis A. Pivoted to link 1 is two-arm lever 3 having rollers 4 and 5 at its ends. Roller 4 runs around fixed cam 2. Roller 5, bearing against lug B of gear 6, rotates this gear with variable angular velocity. Gear 6 makes one revolution to each revolution of link 1.
$1686$LC,4L$