| 摘要 |
PURPOSE: A thermal sealing apparatus having a safety lifting function for a sealing bar is provided to release compression quickly when objects such as worker's fingers are trapped. CONSTITUTION: A thermal sealing apparatus having a safety lifting function for a sealing bar comprises a base(110), a rotation support bracket(116), a hinge shaft(118), an arm(120), a lift driving part(126), a vertical sliding bar(130), a sensing switch(134), and a controller. A lower sealing bar(112) and a band heater(114) are installed on the base. The rotation support bracket has a vertical sliding hole. The hinge shaft is inserted in the sliding hole of the rotation support bracket and moves up and down. The arm is coupled with the hinge shaft and hinged on the upper end of a lift driving bar. The lift driving part generates a driving force and transfers the driving force through the lift driving bar to the arm. The vertical sliding bar is elastically supported upward by an elastic spring in the normal times and pushed down by the rear part of the arm or the hinge shaft lowered by the seesaw motion caused by the reaction when an upper sealing bar(122) contacts an object inserted between the upper sealing bar and the lower sealing bar. The sensing switch senses the down motion of the sliding bar and transmits a sensing signal to the controller.
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