Vorrichtung zum Schweissen von schlauchförmigem Verpackungsmaterial

摘要

A sealing device for a packaging material tube has a pair of pressure arms (13) supported by a lift frame (11) each at a lower portion thereof and pivotally movable about respective parallel horizontal axes. A pair of sealing jaws (14) are fixed to the respective pressure arms (13) each at an upper portion of the arm so as to be opposed to each other. A high-frequency heating coil (18) is provided on one of the sealing jaws (14) for induction-heating an aluminum foil layer of the tube T present between the sealing jaws (14)as closed. A transmission-side primary coil (21) is fixedly disposed at one side of the path of vertical movement of the lift frame (11). A receiving-side secondary coil (22) is so disposed as to form a closed electric circuit along with the heating coil (18). The primary coil (21) and the secondary coil (22) are electromagnetically connected when the sealing jaws (14) are closed, and are electromagnetically separated when the jaws (14) are opened. <IMAGE>