traction, rewinding traction torque is much smaller than the tension at both ends and the other side of the elongated elastic woven shrink more, but did not include the contact side of the pole pieces conditioning middle woven contraction less, so that the two ends and the other side becomes tight side, and including no contact with the rod side of the web conditioning middle relaxation. Constitute the convex hull of the icon when the amount of slack after the traction roller, when the cumulative amount of slack to reach a certain value, it is pushed out of the dead fold. If both sides of the front section of the woven fabric take traction A, it is the force shown in Figure 9, under the action of the traction force T generates a reaction force F, a reaction force F from the main ring size (ring), and includes the resistance of limiter resistance. Under ordinary conditions, the size of the ring (ring) resistance of the cloth around the barrel is equal, and include limiters, including parcels in the role of conditioning lever on both sides of the resistance is large, and is a variable, it includes pieces of conditioning N is proportional to the tension rod, which is