Gear 1 rotates about fixed axis A and meshes with internal gear 3 which is integral with cam 2. Cam 2 rotates in fixed bore a whose axis is at a distance from axis A equal to the difference between the pitch radii of gear 3 and gear 1. Cam surface b actuates roller 5 of follower 4 which slides in fixed guide d. When gear 1 rotates at a speed of n₁ rpm, cam 2 rotates at the speed n₂=(z₁/z₃)n₁ rpm, where z₁ and z₃ are the numbers of teeth of gears 1 and 3. Gear 1 and cam 2 rotate in the same direction.
$2792$CmG,ML$