| 摘要 |
PURPOSE:To prevent a wire from being cut by furnishing a guide rail with a group of movable sheaves as practicable to approach or go apart from the side of stationary sheave group, wherein the movable sheaves shall be capable of rotating as well as going up and down from the horizontal position with the axis of the stationary sheaves as its center, thereby eliminating risk of applying an excessive tension to the wire. CONSTITUTION:During the wire in accumulation, a group of movable sheaves 2 are pulled with a set tension same as in synchronous condition in which the incoming and outgoing speeds of the wire into/out of the accumulator, and the incoming speed is constant. However the outgoing speed decreases, and when the wire 12 is stopped, the tension applied thereto lowers below the external tension, and the movable sheave group 2 move in the direction of arrow 8 for accumulation of the wire. When out of wire, on the other hand, the incoming speed of wire into the accumulator is constant same as in synchronization and accumulation, but the outlet wire speed becomes higher than the inlet for the purpose of collection, which can be performed only under the condition wherein the tension is greater than the external tension to cause the wire 12 with increased tension, so that rotating and tilting a guide rail 3 will allow the movable sheave group 2 to move toward the stationary sheave group 1 by their own weight to lead to setoff of the increased tension, which will ensure prevention of elongation or cutting. |
