| 主权项 |
1. A device for monitoring a machine movement of a movable constructional element, the device comprising:
a detection device comprising at least one transmission unit configured to transmit an optical signal, and a reception unit configured to receive the optical signal; and a control device comprising an evaluation unit configured to evaluate the optical signal received at the reception unit, the control device being configured,
to allow the machine movement upon a receipt of the optical signal at the reception unit, and,to output a first triggering pulse to stop the machine movement in an absence of the optical signal at the reception unit, wherein, the evaluation unit comprises a first threshold value measuring unit configured to detect a signal strength of the optical signal received at the reception unit and which, upon detection that a predetermined threshold value of a signal strength is fallen short of, is configured to output a second triggering pulse to stop the machine movement. |
