Combine harvester for maize including: - a collecting head to feed a rotating threshing cylinder with the crop during the progress on the ground, the threshing cylinder pulling the crop through counter-threshers for shelling the panicles and forwarding the undifferentiated residuals to an auxiliary beating cylinder that throws said residuals in the direction of an outlet at the back; - at least two oscillating sieves (15, 16), one above the other, for winnowing the grains mixed with small vegetal residuals; - a fan adjoining the sieves (15, 16) for generating a cleaning air flow transversally blowing on the grains falling from the upper sieve, and further blowing on said undifferentiated residuals to help their travelling towards the discharge outlet; - a deflector panel placed beyond the auxiliary beating cylinder, tilted with respect to the vertical direction by an angle which deflects said undifferentiated residuals in the direction of a further oscillating sieve located below and acted upon by the air flow generated by the fan; - a transversal auger located below the further sieve for intercepting the whole corncobs which cross through and putting them into a duct of pneumatic transport means; characterized in that it further includes: - a chipper device (27, 41, 42, 43) adjacent to the transversal auger for intercepting the corncobs discharged by the auger, the chipper device including a knife-holding rotor and a fixed wall supporting the counter-knives which together delimit the initial section of said duct, - a pneumatic fan in fluid communication with said duct to intake the corncob chips thrown by said rotor in the duct and eject them out of the delivery mouth within the air flow towards the outlet of said duct. - a collecting head to feed a rotating threshing cylinder with the crop during the progress on the ground, the threshing cylinder pulling the crop through counter-threshers for shelling the panicles and forwarding the undifferentiated residuals to an auxiliary beating cylinder that throws said residuals in the direction of an outlet at the back; - at least two oscillating sieves (15, 16), one above the other, for winnowing the grains mixed with small vegetal residuals; - a fan adjoining the sieves (15, 16) for generating a cleaning air flow transversally blowing on the grains falling from the upper sieve, and further blowing on said undifferentiated residuals to help their travelling towards the discharge outlet; - a deflector panel placed beyond the auxiliary beating cylinder, tilted with respect to the vertical direction by an angle which deflects said undifferentiated residuals in the direction of a further oscillating sieve located below and acted upon by the air flow generated by the fan; - a transversal auger located below the further sieve for intercepting the whole corncobs which cross through and putting them into a duct of pneumatic transport means; - a chipper device (27, 41, 42, 43) adjacent to the transversal auger for intercepting the corncobs discharged by the auger, the chipper device including a knife-holding rotor and a fixed wall supporting the counter-knives which together delimit the initial section of said duct, - a pneumatic fan in fluid communication with said duct to intake the corncob chips thrown by said rotor in the duct and eject them out of the delivery mouth within the air flow towards the outlet of said duct.