Gears 2 and 4 are keyed to driving shaft 1 which rotates about fixed axis A-A. Gears 2 and 4 have different numbers of teeth and mesh with gears 3 and 6. Gear 3 rotates freely on shaft 7 about fixed axis B-B and is integral with clutch-like cam 5 having wedge-shaped recess a. Gear 6 is keyed to driven shaft 7 and has wedge-shaped projection b which engages recess a of cam 5. Owing to the different speeds of gears 3 and 6, shaft 7 rotates with a simultaneous axial reciprocating motion in fixed guides of base 9. Lever 10 and spring 8 hold projection b in contact with recess a of cam 5.
$2800$CmG,SF$