Patent ID: 6904741

Claim:
A roll assembly for use on a crop conditioning machine comprising: first and second elongate rotatable rolls supported in a framework for rotation about respective first and second axes of rotation and disposed in adjacent parallel relationship, said first roll generally above said second roll; each said first and second rolls having a peripheral surface; said second roll comprising an elongate cylindrical rigid body portion having a generally smooth peripheral surface with a layer of hard elastomeric material affixed thereto, said elastomeric layer having at least one groove therein, said groove being formed in a spiral along the length of said rigid body portion; and said at least one groove generally having a cross-sectional configuration comprised of at least a first and second surfaces, said first surface being generally perpendicular to the tangent of said peripheral surface of said second roll and said second surface tapering at an angle from the edge of said first surface closest to said second axis of rotation, the intersection of said second surface and said peripheral surface of said second roll forming a leading edge.