Bag making machine

Claim 1

A perforator means for a bag making machine, comprising a perforator roller having a toothed blade operatively associated with an anvil roller for passing a bag material therebetween to effect perforations therein, said perforator roller comprising a rotary shaft having a toothed blade rigidly mounted thereon with its teeth successively extending along the axial direction of said shaft, said teeth, as seen in end view, having a pitch diameter such that the outer ends of said teeth intersect the outermost arc defined by said anvil roller, said anvil roller having an outer surface of resilient material whereby said teeth penetrate thereinto pursuant to rotation of said perforation roller relative to said anvil roller, said blade forming an acute angle with a line which interconnects the axes of rotation of said perforator and anvil rollers at the moment that said teeth first intersect said arc of said anvil roller, wherein said blade is rigidly mounted on a sleeve and said sleeve is longitudinally adjustable along the length of said shaft to either of various positions thereon, including a plurality of blades arranged in axial succession along said shaft, each blade being mounted in a separate respective said sleeve and each sleeve being axially and angularly adjustable along said shaft tO either of various fixed positions thereon whereby the axial spacing between blades and the angular disposition of same relative to each other may be varied.