The principle of the labeling machine is that the item is fed to the labeling machine at a constant speed on the conveyor. The mechanical fixture separates the items a fixed distance and pushes the item in the direction of the conveyor. It has a drive wheel, a labeling wheel and a reel. The mechanism is a kind of advanced driving device of hot shrink labeling machines. that’s is kind of device with four wheel drive , automatic centering through four wheel with balanced pressure .