Measuring device for measuring material plates and plant

Measuring device (16) for measuring material plates (12) with a conveyor (18)， with which material plates (12) can be guided on a conveyor path (24) in a conveying direction (22) through the measuring device (16)， with at least two detection units (26a， 26b， 26c; 26d， 26e)， whose respective detection areas (32a， 32b， 32c; 32d， 32e) are arranged at a distance from one another in the conveying path (24) of the material plates (12) and with which at least one material plate (12) can be detected in the respective detection areas (32a， 32b， 32c; 32d， 32e)， while the at least one Material plate (12) is guided through the measuring device (16) and with at least one evaluation device (34) which is functionally connected to the at least two detection units (26a， 26b， 26c; 26d， 26e) and with which at least one dimension， in particular a length (L)， of the detected at least one material plate (12) can be determined from detection signals of the at least two detection units (26a， 26b， 26c; 26d， 26e) that the at least two detection units (26a， 26b， 26c; 26d， 26e) are designed in such a way that with them a respective detection signal in the form of an entry signal (44a， 44b， 44c) when the at least one material plate (12) enters the respective detection area (32a， 32b， 32c; 32d， 32e) and / or a respective detection signal in the form of an exit signal (46a， 46b， 46c) when the at least one material plate (12) emerges from the respective detection area (32a， 32b， 32c; 32d， 32e) can be generated， the at least one evaluation device (34) being designed such that with it at least one time interval (T (on， ba)， T (on， cb)， T (on， b - off， a )) can be determined between at least two detection signals and from at least one time interval (T (on， ba)， T (on， cb)， T (on， b - off， a)) between at least two detection signals and at least one further predetermined ， Predeterminable and / or measurable size at least one dimension， in particular a length (L) and / or an orientation and / or an angularity of the at least one material plate (12) can be determined.