US Patent 10287111 LIM-driven roller transfer apparatus

An activated roller transfer apparatus for transferring articles between one conveyor and another. The roller transfer apparatus comprises a linear-induction-motor stator as a primary and electrically conductive article-supporting rollers as a secondary. The linear-motor stator generates a traveling magnetic flux wave that induces eddy currents in the rollers. The eddy currents produce magnetic fields that interact with the flux wave to produce forces that rotate the rollers to propel articles across a gap between the ends of the two conveyors. The stator is generally trapezoidal in shape to comport with the shape of the gap.