Method and apparatus for detecting web breaks

US6604661B2 · kind B2 · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Bernhard Feller · Friedberg, DE
• Robert Kersch · Augsburg, DE
• Harald Pecher · Augsburg, DE

Key dates

• Filing date: May 31, 2001
• Grant date: Aug 12, 2003
• Expiry date: May 31, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H26/025
• WIPO field: Handling
• WIPO sector: Mechanical engineering

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.