Control system for a draw-off system for sheet material

US4919412A · kind A · utility

Assignee

• Nixdorf Computer AG · DE

Inventors

• Peter Weigel · Borchen, DE
• Guenter Holland-Letz · Paderborn, DE
• Heinz Ademmer · Geseke, DE
• Ulrich Nottelmann · Bad Driburg, DE

Key dates

• Filing date: Feb 29, 1988
• Grant date: Apr 24, 1990
• Expiry date: Feb 29, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2301/321
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A control system for the pressing force created on the draw-off roller system (24) in a single-feed mechanism for sheet material (16) is described. This pressing force has an optimum value when the time required for the respective draw-off operation is the minimum amount. For a corresponding regulation, a time measurement is performed with successive draw-off operations. The times thus determined are evaluated, and if they are found to be the same, the value of the pressing force reached following regulation of a drive that produces the pressing force is retained.