Web perforating utilizing a single perf cylinder and dual anvils

Abstract From the Canadian patent

In the perforation of webs such as in the, perforation of paper webs in the production of busines forms, a single perforating cylinder is utilized in cooperation with two anvil cylinders. Perforating elements such as interrupted blades, extend outwardly from the periphery of the perforating cylinder and are rotated into operative association with the web passing between a first anvil cylinder and the perforating cylinder and a, second anvil cylinder and the perforating cylinder to form first and second sets of perforations spaced a predetermined desired amount along the web. The length of the web between the first and second anvil cylinders is adjustable to control precisely the spacing of …