Round roller 1 rotates freely about fixed axis D. Cam 2 has contour a which rolls along roller 1. Cam 2 is connected by turning pair A to rocker arm 3 which turns about fixed axis B. When cam 2 rotates about axis A, it has a complex motion, oscillating rocker arm 3 about axis B. Cam 2 is held in contact with roller 1 by spring 4.
$3029$SmC,3L$