US Patent 7544127 Straw chopper for combine with adjustable stationary knife bank

A straw chopper for an agricultural harvesting machine includes a housing, a rotor carried by the housing, and a stationary knife bank. The rotor includes a plurality of pendulously mounted knife blades. The stationary knife bank includes a plurality of stationary knife blades adjustably movable toward and away from the rotor. The stationary knife bank includes a tension rod extending longitudinally through the stationary knife bank and having a threaded end, and at least one wing nut threadingly engaged with the threaded end.