| 摘要 |
The invention relates to a web-guiding or sheet-guiding machine, in which webs or sheets are transported along a transport path (z), and which has at least one roller nip, it being possible for at least one of the rollers, which delimits the roller nip or is located downstream of the roller nip on the transport path, to be driven by an electric drive. A power controller is assigned to the electric drive, and the web-guiding or sheet-guiding machine is equipped with a safety device, which makes it possible to monitor whether foreign bodies are penetrating into the roller nip and/or whether a specified torque for the drive is being maintained. The safety device here comprises a first measuring device, which can monitor at least one first electric variable of the power made available to the drive by the power controller. The safety device comprises a second measuring device, which can measure a second physical variable having a functional relationship with the first electric variable. The safety device comprises a computer module by means of which the time sequences of the two variables can be compared with one another and warning signals can be generated in the event of deviations in the time sequence.
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