PROBLEM TO BE SOLVED: To prevent a culm or leaf of a reaped grain culm from winding around a rotary fan in a dust exhaust device of an ordinary type combine.SOLUTION: The ordinary type combine includes: a feeder 2 for feeding the reaped grain culm from a reaping device 15 to a threshing device 13 a dust exhaust device 4 having a rotary fan 40, provided at a top face of a feeder case 20 of the feeder 2, and suctioning dust around the reaping device 15 via the feeder case 20 to discharge to the outside a motor M for driving and normally and inversely rotating the rotary fan 40 and a motor inverse rotation command part 62 for outputting an inverse rotation command for commanding inverse drive of the motor M to a motor control part 61 for controlling the motor M.SELECTED DRAWING: Figure 1
