Disk 1 is keyed on driving shaft A and rotates with it. Gear 2 is rigidly attached eccentrically on disk 1, at the distance A͞D from axis A, and meshes with gear 5. Gears 5 and 6 are rigidly attached together and are connected by turning pair B to rocker arm 4 which turns about fixed axis C. Gears 2 and 5 are held in engagement by connecting rod 3. Gear 6 meshes with gear 7 which rotates about axis C. When driving shaft A rotates, rocker arm 4 with axis B oscillates about axis C. In each revolution of disk 1, gear 7 turns first in one direction and then in the other. It turns faster and more in one direction than in the other. The periods of forward and reverse rotation depend on the dimensions of the links of four-bar linkage ADBC and on the relations of the numbers of teeth of gears 2, 5, 6 and 7.
$2463$LrG,ML$