Sleeve 1 rotates about fixed axis A and is connected by sliding pair B to shaft 3 on which cylinder cam 4 and worm 5 are rigidly mounted. Cam 4 has continuous helical groove a with a helix angle equal to that of the thread on the worm. Groove a slides along roller 6 which rotates about a fixed axis. Worm 5 meshes with worm wheel 2 which rotates about fixed axis C. When sleeve 1 rotates, worm 5 has supplementary reciprocating motion along axis A so that worm wheel 2 rotates intermittently with supplementary motion in one direction followed by a dwell.
$3309$GrC,ML$