The mechanical linkage is not suitable for large,
heavy conveyor applications, as the reaction cannot be
counterbalanced successfully. The system of rotating
unbalances, however, can be integrated with the vibrating
structure, to generate an internal straight-line
inertia force that causes the system to oscillate along
a single horizontal axis. Forces normal to the desired
line of action are canceled by the 180 deg. angular
opposition of pairs of contra-rotating unbalances.