Method and apparatus for severing packaging material between successive

Abstract

A method and apparatus is provided for severing packaging material which extends between successive wrapped loads during a continuous wrapping process. Wrapped loads are conveyed along a load path in a conveying direction. A severing bar which extends lateral to the conveying direction includes a heating element which is connected to a power source by an electrical conductor. A sprocket and chain drive is used to transport the severing bar along a closed path having first and second segments. The first segments generally extends lateral to the extent of the severing bar and has a component in the conveying direction. During the first segment of transport, severing bar is transported across the load path between and along with a first pair of successive loads. The second segment of the closed path generally extends lateral to the extent of the severing bar as a component in the conveying direction. During transport over the second segment, the severing bar is transported back across the load path between and along with the second pair of successive loads. A fixed support frame is used to support the chain and sprocket drive. A guide frame, guide follower and rotary bearing are used to prevent rotation between the severing bar and the fixed support frame and to prevent twisting of the electrical conductor during repeated transport of the severing bar around the closed path.