Apparatus for precutting metal strip in the manufacture of spiral strip pipes, e.g. ventilation ducts

摘要: A cutting means in an apparatus for continuously manufacturing spiral strip piping, fed unbroken lengths, consisting of upper, driven knife wheel (4) and a lower, freely rotating, circular, substantially horizontal support roller (20). The knives (4,20) are arranged on table (22), swivellable relation to the travel (1) displaceable perpendicularly (1). Before cutting, angle upper is adjusted, by desired pipe diameter providing square ends.