In fact, the differential shaft shaft is also called friction shaft, which produces friction torque between friction parts and slip ring, so as to achieve constant tension crimping. The invention is mainly used for a winding shaft of a slitting machine, and aims to facilitate the principle that a differential ring of a differential shaft slips. Aft that various materials are strip, the materials are uniformly and tidily wound on one or two shafts from the winding core to the out layer with constant tension.At the same time, it can eliminate the thickness deviation caused by the uneven thickness of the material, greatly compensate the speed difference, reduce the thickness error of the material, tidy the winding end surface, accurately control the tension of each roll of material, balance the tension winding, and ensure the winding quality. Some metal foil materials can greatly improve the yield of metal foil materials. Therefore, the production cost is greatly reduced.