Dual diameter disc debris roll screen

Abstract From the Canadian patent

The secondary slot normally formed between adjacent shafts of a material separation screen is eliminated by mounting primary discs alternately with secondary discs. The primary and secondary discs each have the same shape but the secondary disc has a smaller outside perimeter. The primary and secondary discs preferentially have an arched pentagonal shape. The primary discs on one shaft are aligned with the secondary discs on an adjacent shaft. In other words, the large disc is positioned on a shaft to align with a smaller disc on an adjacent shaft. The oppositely aligned and alternating arrangement between the large discs and small discs reduce problems that exist in screens that use …