Abstract: A conveyor comprises a driven conveyor reciprocably movable in a horizontal direction between two spaced driven supports. The supports move vertically, before and after the horizontal conveyor movement, to raise objects from the driven conveyor and to lower objects onto the driven conveyor. The driven conveyor and the supports have a common drive motor driving a mechanical driven train, the movements of the driven conveyor and the supports being synchronized with each other so that the driven conveyor interrupts its movements when the supports move. The driven conveyor comprises a carriage movable in a frame and coupled to the drive motor via a crank mechanism, in which a first crank connected to the drive motor engages a guide movably mounted in the frame and actuating the carriage. This guide is arranged to be at rest during a portion of the rotational cycle of the crank.