| 摘要 |
The invention describes a web-guiding or sheet-guiding machine in which webs or sheets are transported along a transporting path (z) and which has at least one roller nip, it being possible for at least one of the rollers which bounds the roller nip, or is located downstream of the roller nip on the transporting path, to be driven by an electric drive. The electric drive is assigned a power divider, 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 a first, electric variable, the power made available to the drive by the power divider. The safety device comprises a second measuring device, which can measure a second, physical variable, this 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 profiles of the two variables can be compared with one another and, in the event of deviations in the time profiles, alarm signals can be generated. |
