| 摘要 |
PROBLEM TO BE SOLVED: To make a brake mechanically return without performing electric control, and to maximally prevent the damage of return wires.SOLUTION: Return wires W2, W3 extending from actuation means for making a brake return comprise a first portion W31 at the actuation means side and a second portion W30 at a winder side by being folded via a back plate 4 and wound to a winder 10'', the first portion W31 and the second portion W30 of the return wires W2, W3 which are withdrawn from the winder 10'' accompanied by the own-weight descending of a shutter curtain 1 are extended along a shutter curtain face part while being exposed to an opening part. When the back plate 4 at a lower end of the shutter curtain 1 which descends by own weight abuts on an obstacle, the withdrawal of the return wires W2, W3 is regulated in conjunction with the upper movement of the lower back plate, and the first portion W31 of the return wire which is regulated in the withdrawal moves the actuation means to a second direction by the own-weight descending of the shutter curtain 1, thus making a brake return. |
