| 摘要 |
A sealing frame (25) for a heat-sealable film, comprising a fixed portion (23) and a movable portion (24), the movable portion being articulated so that it can be moved close to the fixed portion by a movement actuator (13). A yieldable connecting device (10) is interposed between the actuator (13) and movable portion, which device (10) comprises one element (16) connected to the actuator and a second element (14) connected to the movable portion (24). The first and second elements are mutually hinged and a spring (18) is interposed therebetween. An electric switch (19) for stopping the actuator (13) movement in the direction of moving the frame portions close to each other is interposed between said first and second elements. The switch is thus operated when the spring compression exceeds a predetermined amount indicating the presence of obstacles to the movement of the movable portion (24). <IMAGE> |
