Worm 1 rotates about fixed axis A and meshes with worm wheel 2 which rotates about fixed axis B-B. Cam 5 is integral with worm wheel 2, its working surface being machined on the wheel hub. Follower 6 reciprocates along fixed guides a-a and carries roller 3 which rolls along the contour of cam 5. Roller 3 is held in contact with cam 5 by spring 4.
$3303$GrC,ML$