Apparatus for roughing the surfaces of casted concrete block

A casted concrete block surface roughing machine comprising a plurality of abrading devices an in-line conveyor displaceable over a stationary horizontal support surface for slidingly supporting a lower face of concrete blocks displaced thereon by said conveyor, said in-line conveyor having at least two pairs of spaced apart vertically supported narrow conveyor belts disposed to engage opposed side faces of said concrete blocks to displace them along said stationary horizontal support surface, said conveyor belts being pressure-biased against said opposed side faces, one of said pairs of conveyor belts engaging said opposed side faces in a lower surface section thereof to expose an upper surface section thereof to be abraded by respective first and second abrading devices, the other of said pairs of conveyor belts engaging said same opposed side faces in said upper surface section thereof to expose a lower surface section thereof to be abraded by further respective third and fourth abrading devices, a fifth abrading device along said in-line conveyor for abrading a top surface of said concrete blocks conveyed thereunder by said vertically supported conveyor belts, and sixth and seventh abrading devices for abrading a top side edge of opposed side faces of said concrete blocks conveyed thereby by said one of said pairs of conveyor belts.