| 摘要 |
The switching system is designed so that the scanning unit (27) has at least one electrically conducting contact element (28), arranged between at least two assemblies, movable against each other, which is provided at one of these assemblies (19). A voltage source is provided, which is connected with the contact element in such a way that when the contact is moved apart, an alteration of the voltage occurs, leading to the switching off of the electric circuit. |
