Power winding is composed of steel strip coil system, in accordance with its relaxed into the shape of a natural shape and force power wind power two, power directly from the natural shape spring strip wound prestressed power system, put the strip shape, and then in the opposite direction into a spiral shape and letters, after S. Like, so it is also called S type spring. Scroll spring in the use of the need to limit its outer barrel, a center shaft is connected with the power, when the external force to the shaft rotation and spring, spring will roll on the power shaft and stored energy, when the external force disappears, the spring will produce torque drive shaft, the spring storage kinetic energy through the drive shaft the output of the same specifications, under the comparison, prestressed power spring can store 25%-40% of torque, the same space can provide the rotation number of more.
Wind power is mainly used in clockwork toys, wire spring, electric wire spring collection, clocks and timers, rolling machine, automobile safety belt.