Material processing apparatus (20) includes a housing (22) with a plurality of vertically stacked inverting pan conveyors (42, 44) therein. Each conveyor (42, 44) includes a plurality of conveyor pans (50) traveling between and around aligned front and rear sprocket pairs (90, 92) to define upper and lower conveyor runs (52, 54). Each pan (50) has a perforated base plate (56) presenting a pair of opposed material-supporting surfaces (58, 60). As the pans (50) traverse the sprocket pairs (90, 92), they are inverted, and material (110) carried by the upper run pans (50) is transferred to the lower run pans (50) by passage of the material around and/or between the sprocket pair (90).

An egg conveyor assembly (1) comprises a first conveyor (4) having a first conveyor direction (X), a second conveyor (5) extending in a second conveyor direction (Y) transverse to the first conveyor direction (X) and a transfer device (6) arranged between the first conveyor and the second conveyor. The transfer device includes a transfer conveyor comprising and endless element (60) and extending in the second conveyor direction (Y). The second conveyor circulates second egg retainers (52) continuously, and the transfer conveyor circulates egg transfer retainers (62) discontinuously, in such that the egg transfer retainers of the transfer device are approximately standing still when receiving eggs from the first conveyor, and such that the egg transfer retainers of the transfer device are moving approximately synchronously with second egg retainers of the second conveyor when dropping the eggs in the second egg retainers of the second conveyor.