Method of and apparatus for controlling lateral deviations of a travelling fabric web

US5460312A · kind A · utility

Assignee

• Erhardt & Leimer GmbH · DE

Inventors

• Jurgen Brau · Augsburg, DE
• Jurgen Eisen · Augsburg, DE
• Hans Seibold · Bendorf, DE
• Martin Zeh · Meitingen, DE
• Gunter Franz · Waldkraiburg, DE

Key dates

• Filing date: Oct 27, 1993
• Grant date: Oct 24, 1995
• Expiry date: Oct 27, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2701/124
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

The travel of a fabric web is corrected by an image acquisition from a region thereof including a guidance criterium which can be interrupted to produce a single row of image points, the signals of which are digitalized and compared with a reference signal by relative shifting of the stored signals in two shift registers. The number of shifts required to bring about correlation is determined as a measure of the actual position of the web and compared to a setpoint position for operation of an effector restoring the web to its set point position.