Worm 2 is keyed to shaft 1 and rotates with it about fixed axis A. Shaft 1 can slide in fixed guide 5 along axis A. Worm 2 meshes with worm wheel 3 which rotates about axis B of housing b. The housing contains worm 2 and worm wheel 3. Wheel 3 is connected by turning pair C to link 4 which turns about fixed axis D. When driving shaft 1 rotates, worm 2 transmits reciprocating motion, parallel to axis A, to driven worm wheel 3 in addition to rotation about axis B.
$2819$WG,ML$