(57) A horizontal surface (20) is provided, which is substantially equal to the plan projection
of the carriage loading compartment (11) and lies above this when the carriage (10)
is in its retracted position, and comprises a plurality of apertures (21) for passage
of the materials; with the surface (20) there are associated means (40, 44) for opening
and respectively closing the apertures (21) in said surface; the apertures (21) in
the perforated surface (20) are distributed as at least two separate pluralities (21',
21''), means (22, 24, 25) being provided for conveying material originating from a
respective feed container (30', 30'') into each plurality of apertures (21', 21'').
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