| 摘要 |
<p>An apparatus for determining an overtravel time of a machine (12), which has a moving machine part (14) and an optoelectronic protection device (21), has a light source (42) designed to produce a defined light spot (44). The protection device (21) for the machine comprises a camera (22) having an observation area (24) in which at least one protection zone (26) having a protection zone boundary (28) is defined. The protection device (21) produces a stop signal (34) when an object (32) enters the protection zone (26). The light spot (44) simulates an object within the protection zone (26). The light source is supported by a support element (50, 58) designed to position the light source (42) in the area of the protection zone boundary (28). An evaluation and control unit (64) of the apparatus is designed to switch on the light source (42) at a defined starting time, and to determine a time interval (”t) between the defined starting time and the reception of a stop signal. (Fig. 1)</p> |
