Method of measuring the tensile stressing of a moving web

US7895907B2 · kind B2 · utility

Assignee

• Texmag GmbH Vertriebsgesellschaft · CH

Inventors

• Frank Thumer · Augsburg, DE
• Hans Seibold · Bendorf, DE
• Rudolf Werber · Königsbrunn, DE
• Tobias Hain · Augsburg, DE

Key dates

• Filing date: Dec 14, 2007
• Grant date: Mar 1, 2011
• Expiry date: Jul 30, 2028

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H26/04
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

In a method for measuring the tensile stress of a running web, force sensors (7) are connected in the form of a Wheatstone bridge (11). An amplifier (18) amplifies a diagonal voltage (17) of the Wheatstone bridge (11). In order to be able to detect whether at least one of the force sensors (7) is defective, the Wheatstone bridge (11) can be loaded using at least one resistor (26) by means of at least one switch (24, 25). Comparing the measured values, with loading, with the measured values, without loading, determines whether the force sensors (7) of the Wheatstone bridge (11) are functional. Otherwise, an active error signal (28) is output.