Worm 1 and cylinder cam 2 are rigidly attached together and can slide axially along a feather key on shaft 4 which rotates about fixed axis A-A. Worm 1 meshes with worm wheel 3 which is keyed to shaft 5 and rotates about fixed axis B. Roller 6 rotates about fixed C and rolls and slides along profiled groove a of cam 2. When shaft 4 rotates at uniform speed, worm 1 and cam 2 rotate and reciprocate axially, transmitting nonuniform rotation to worm wheel 3 and shaft 5, which depends on the profile of groove a.
$3298$GrC,ML$