a method for harvesting crops , such as rows of corn , using a harvester , which provides independent drives and independent controls for gathering belts , and independent drives and independent controls for knife rolls used on the corn harvester . the independent drives and independent controls allow the speed of the gathering belts or the knife rolls to be varied without affecting other harvester components . the independent speed control between the gathering belts and the knife rolls , allow for better harvesting in various crop conditions . the harvester also includes a set up for changing the angle of the corn head to allow better harvesting under varying conditions .