<p>An improved rotary shear for performing slotting work or cutting work upon a corrugated cardboard web at right angles to its traveling direction for making order change easy and smooth, is disclosed. The rotary shear comprises a knife cylinder (2) having a knife (1) fixedly secured thereto over the nearly entire width of its outer circumferential surface, pressing means (18) divided into a plurality of sections along the widthwise direction of the corrugated cardboard web and constructed in such manner that the respective sections can be individually raised and lowered, and an endless elastic body belt (12) driven to travel at a predetermined timing with respect to the traveling corrugated cardboard web. <IMAGE></p>
