Cam 1 rotates about fixed axis B and has projection a which alternately engages square pins 3 and 4 of driven disk 2. Disk 2 rotates about fixed axis A. Pins 3 and 4 are located symmetrically with respect to axis A. Owing to the eccentricity of axis A of disk 2 with respect to axis B of cam 1, pin 3 slides out of engagement with projection a after one half revolution of cam 1, and disk 2 is stationary during the second half revolution of cam 1. Then projection a engages pin 4 and turns disk 2 again.
$3098$SmC,ML$