| 摘要 |
PROBLEM TO BE SOLVED: To reduce the effect of a lock device on a return wire as much as possible.SOLUTION: A lock device 9, which is brought into a lock state during the self-weight descent of a shutter curtain by brake release so that a return wire is pulled, is provided in an upper back plate 40. The lock device 9 is equipped with energization means of the direction of taking up the return wire, and includes: a take-up drum 91 for taking up the return wire; a lock drum 90 having a peripheral surface 901 on which the return wire is wound and a locked part 903; and a rotary lock member 92 with a catch 921 lockable to the locked part 903. The return wire is wound around the lock drum 90 and then is taken up onto the take-up drum 91. |
