Method and apparatus for detecting web breaks
AssigneeMAN Roland Druckmaschinen AG
InventorsBernhard Feller, Robert Kersch, Harald Pecher
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Abstract
In web-fed rotary printing machines having a plurality of operating units arranged one after another, each unit having synchronously driven elements that interact directly or indirectly with the printing-material web, high reliability and short response times are achieved by a torque monitoring device having inputs for signals corresponding to the torque on at least one element of each operating unit. Upon the occurrence of an abrupt torque change on at least one monitored element, the monitoring device generates an output signal associated with a web break.
Claims11
A method of detecting a web break in a web-fed rotary printing machine having a plurality of operating units arranged in tandem, each said operating unit having at least one element which interacts with the printing material web, said method comprising
- driving said elements synchronously, each element being individually driven with a torque,
- monitoring the torque on each said element individually, and
- deriving a signal indicating a web break in response to an abrupt change in torque in at least one operating unit.
An apparatus for detecting a web break in a web-fed rotary printing machine having a plurality of operating units arranged in tandem, each said operating unit having at least one element which interacts with the printing material web, each element being individually driven with a torque, said apparatus comprising
- control means for driving said elements synchronously and for generating signals corresponding to the torque driving each said element, and
- a torque monitoring device which evaluates said signals corresponding to the torque and generates an output signal indicating a web break in response to an abrupt change in torque in at least one operating unit.
Dependencies are inferred from the claim text.