Patent ID: 6422986
Filing Date: 2002-07-23
Classification: B29C,B31B

Abstract:
In a plastic forming machine requiring sealing of a plastic web during the formation of plastic members by passing of the plastic web through a sealing apparatus for forming a seal portion across the web, said sealing apparatus comprising a support structure, upper and lower seal bar units extending transversely for a length at least equal to the width of the plastic web moving therebetween, at least one of said upper and lower bar units being mounted for movement into sealing engagement with the other of said seal bar units, comprising the improvement includinga drive system mounted substantially in alignment with said movable bar unit and including a drive shaft and a substantial plurality of mechanical connecting units interconnected in longitudinal spaced relation to said shaft and said movable bar unit to establish and maintain an even substantial equidistributed support and force on said shaft over the length of said shaft, each said mechanical connecting unit being configured to rotate with the drive shaft and establish a substantially corresponding vertical motion of said seal bar unit in a substantially perpendicular relationship to said web, said movable seal bar unit being constructed with a substantially low inertia and with said multiple connecting units providing equally distributed physical support for said movable seal bar unit over the total width thereof.