Patent ID: 8215363

Claim:
An automatic machine for producing corrugated sheet with at least a first ribbon and a second ribbon, comprising: corrugating means for continuously corrugating said first ribbon that moves longitudinally; feeding means for feeding together said second ribbon with said first ribbon; and joining means for mutually joining said first and second ribbons in discrete regions; said corrugating means for continuously corrugating said first ribbon comprising a reel for dispensing the first ribbon, an upper conveyor and a lower conveyor, said first ribbon being dispensed for insertion between said upper and lower conveyors, said upper conveyor having a plurality of upper rods and said lower conveyor having a plurality of lower rods, said upper rods being arrangeable so as to be intercalated between the lower rods; said upper conveyor comprising a continuous upper chain and a plurality of said upper rods, which are supported by lateral arms that protrude from coupling blocks, said coupling blocks being associated with linkc of said continuous upper chain, said arms being arranged substantially at right angles to an orientation direction of said chain; said lower conveyor having a lower chain to which the plurality of said lower rods is connected, and actuation means for actuation of said lower rods; the machine further comprising an auxiliary chain that is movable in step with said lower chain and is provided with a plurality of guiding elements that are adapted to engage an end of said lower rods in a position in which the lower rods are extracted from said actuation means, said actuation means comprising cylinders.