Abstract: Apparatus useful for either loading or unloading a workpiece carried on a C-shaped carrier of a conveyor. The base of the carrier has a pair of spaced legs on which the workpiece is carried. The loading apparatus includes a carriage that is moveable along a pair of guide bars toward and away from the path of motion of the carrier. A cradle supports the workpiece and is carried on the carriage so as to be received between the legs of the carrier for loading the workpiece. The loading apparatus includes a pair of motors. One is connected to the carriage to move it in a reciprocating, horizontal, harmonic motion. The second motor is mounted on the carriage so as to be moved with it in the horizontal motion. The second motor is connected to the cradle to move it in a vertical, harmonic motion. The two motors are energized in an alternating manner so that the cradle is moved in a rectangular, path of motion and synchronized with the conveyor carrier.