L-type heat sealing device with uniform sealing pressure

Abstract

A heat sealing device includes a frame rotatably supporting gears and comprising four fixed upright guide rods. Upper and lower members, in the form of U-shape, are movable along the guide rods between engaging position and separated position. The upper and lower members each have four racks respectively engaging the gears whereby the upper and lower members are movable synchronously. A power cylinder has a rod mounted to the upper member for driving the upper and lower members toward/away from each other. Heating elements are mounted to the upper and lower members and are substantially opposite to each other. The upper and lower members are maintained substantially parallel to each other during the movement thereof whereby a uniform sealing pressure is applied to the heating elements of the upper and lower members to achieve high quality sealing results.

Dependencies are inferred from the claim text.