Traversing cutting apparatus having magnetic follower means

Claim 1

IN A WEB PROCESSING MACHINE, THE COMBINATION COMPRISING, MEANS FOR GUIDING A TRAVELLING WEB MOVING ALONG A PATH, AN IMPERFORATE TUBE EXTENDING TRANSVERSELY OF SAID PATH, A PISTON SLIDABLE WITHIN THE TUBE AND HAVING AN ANNULAR PORTION IN FLUID SEALING RELATIONSHIP WITH THE INNER SURFACE OF THE TUBE TO BE INSURE MOVEMENT OF THE PISTON WITH FLUID PRESSURE DIFFERENTIAL THEREACROSS, A CARRIAGE MEANS OUTSIDE OF SAID TUBE AND SLIDABLE THEREON, MEANS OPERATIVE ON THE WEB AND SUPPORTED ON THE CARRIAGE MEANS FOR TRAVERSING A DIAGONAL PATH ACROSS THE MOVING WEB, A FIRST MAGNETIC MEMBER, A SECOND MAGNETIC MEMBER MAGNETICALLY ATTRACTED TO THE FIRST MEMBER WITH ONE OF SAID MEMBERS SECURED TO THE PISTON AND THE OTHER OF SAID MEMBERS SECURED TO THE CARRIAGE MEANS SO THAT THE CARRIAGE MEANS WILL MOVE ALONG THE TUBE WITH THE PISTON, A FIRST FLUID CONNECTION AT ONE END OF THE TUBE FOR PROVIDING A PRESSURE DIFFERENTIAL ACROSS THE PISTON, A SECOND FLUID CONNECTION AT THE OTHER END OF THE TUBE, AND MEANS FOR SELECTIVELY PROVIDING A FLOW OF FLUID THROUGH SAID FIRST OR SAID SECOND CONNECTION TO CAUSE THE PISTON AND CARRIAGE MEANS TO SELECTIVELY MOVE ACROSS THE PISTON AND CARRIAGE TION AT A RATE WHICH IS DEPENDENT UPON THE FLOW OF FLUID THROUGH SAID CONNECTIONS.