Patent ID: 6293175
Filing Date: 2001-09-25
Classification: B26D,B65H,F15B,Y10T

Abstract:
A method for cutting a web, comprising the steps of:applying a return pressure at a top of a piston chamber to move a piston to a bottom of te piston chamber,maintaining the piston at the bottom of the piston chamber by applying a vacuum force below the piston, the piston having with a cutter blade attached to the top of the piston and adapted to engage and cut the web,introducing a pressure into at least one pressure chamber in flow communication with a lower side part of the piston chamber such that the pressure bears against a side of the piston when the piston is at the bottom of the piston chamber,removing the return pressure acting on a top of the piston,stopping the application of the vacuum force being applied below the piston, andintroducing pressure below the piston to cause movement of the piston toward the top of the piston chamber such that upon movement of the piston, the at least one pressure chamber is in flow communication with the piston chamber and the pressure in the at least one pressure chamber is effective against a lower part of the piston to accelerate the piston and the cutter blade to thereby cut the web.