Variable velocity conveying method and apparatus for continuous motion saws

摘要

The saw operating method comprises the steps of transversely cutting continuously advancing elongated lengths of multi-ply web material into shorter lengths, the saw having a constant speed component parallel to the elongated lengths during cutting. The elongated lengths are advanced at a speed equal to the saw speed component during cutting and varying the speed of advance. The elongated lengths are advanced between consecutive cuttings from the equal speed by accelerating/decelerating the elongated lengths while maintaining the saw at the constant speed. The varying step includes the use of a servo to achieve a predetermined profile of speed advance of the elongated lengths.