| 摘要 |
PURPOSE:To detect the lowering of a tightening force due to a cause such as the loosening of a screw, by assembling a sensor which detects deformation generated in the case of a photoelectric switch in the case. CONSTITUTION:When an operating power source is supplied after the photoelectric switch 11 is tightened on a mounting bracket 20, etc., with the screw, no defective tightening signal is generated if the switch is mounted with a normal tightening force. But, when the unsatisfactory tightening force of the screw is applied or when the screw is loosened after tightening, the resistance value of a strain guage 18 is changed, thereby, the balancing of a bridge circuit is lost, and a difference between two outputs is increased, then, as a result, an output transistor 37 is energized, and it becomes the defective tightening signal.
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