Patent ID: 7305807

Claim:
A shrink film machine for wrapping goods having a distance detecting device comprising a frame, a bag feeding device coupled to the frame for feeding continuous shrinkable film bags, a bag sealing and cutting device fixed to the top portion of the frame, a bag sucking device mounted to the frame below the sealing device for opening a shrinkable film bag, a vertically moveable bag expanding device mounted to the frame below the sucking device for enlarging the opening of the shrinkable film bag and for lowering the bag over the goods, an ultrasonic sensor secured in a fixed position beneath the bag sealing device and above the sucking device for measuring the height of the goods to be wrapped in the shrinkable film bag; and a control system for receiving the measurement obtained from the ultrasonic sensor to initiate sealing and cutting actions immediately after the shrinkable film bag is lowered by means of the bag expanding device to a position encompassing the goods.