| 摘要 |
A machine to cover articles ( 50 ) with flexible plastic material sheets ( 51, 52 ) is described. The machine comprises an assembly for heat-sealing and cutting the sheets ( 51, 52 ) which cooperates with a work surface ( 1 ). The assembly comprises a first ( 11 ) and a second ( 12 ) element, of which at least the first element ( 11 ) is movable with respect to the other, and the two elements being arranged on opposite sides of the work surface ( 1 ). The first element ( 11 ) comprises a cutting and sealing blade ( 11 ) having an electric current which passes through it and the second element ( 12 ) comprising a cutting and sealing counter blade ( 12 ). Operation means ( 7, 8 ) being provided to move the cutting and sealing blade ( 11 ) from a rest position to a work position where the cutting and sealing blade ( 11 ) engages said cutting and sealing counter blade ( 12 ). The first element ( 11 ) and the operation means ( 7, 8 ) belong to a unit ( 2 ) connected to the work surface ( 1 ) in a removable manner. The unit ( 2 ) comprises also elastic means ( 3, 4 ) for holding said blade ( 11 ) at rest position.
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