Patent ID: 7547172

Claim:
Machine to cover articles with flexible plastic material sheets, the machine comprising an assembly for heat-sealing and cutting the sheets which cooperates with a work surface, said assembly including a first and a second element, of which at least the first element is movable with respect to the other, and the two elements being arranged on opposite sides of the work surface, said first element including a cutting and sealing blade having an electric current which passes through the cutting and sealing blade and said second element including a cutting and sealing counter blade, operation means for moving said cutting and sealing blade from a rest position to a work position where said cutting and sealing blade engages said cutting and sealing counter blade to seal the plastic material sheets along a continuous line, said first element and said operation means belong to a unit connected to the work surface in a removable manner, said unit including elastic means for holding said blade at the rest position and for bringing said cutting and sealing blade back automatically to the rest position after the cutting and sealing blade is moved to the work position, said cutting and sealing blade being provided with projections inserted inside seats of said unit, said blade including at least a hole for fixing said blade to said unit by a nut so that said blade is easy to remove from said unit.