| 摘要 |
PURPOSE:To detect the locked or unlocked conditions of a locking device without necessity of an exclusive detecting means, by arranging a detector checking whether the locking device is in the locked condition or not at the position where the detector can judge that the operation knob of the locking device is in the position of locked or unlocked condition. CONSTITUTION:An optical sensor is arranged so that when the fitting rod 5b of a locking device 5 is inserted to position at the unlocking spot, the operation knob 5c does not interrupt the beam line A of the optical sensor and when the fitting rod 5b is protruded to position at the locking spot where the rod is fitted in the fitting hole 2a, the operation knob 5c interrupts the beam line A. In this way, the detection as to whether the locking device 5 is in the locking condition or not can be done by use of the positional deviation of the operation Knob 5 between the locked condition and the unlocked condition and hence, the structure becomes simple. |
