Method and apparatus for controlled feeding of sheets to printing machines or the like

US3966197A · kind A · utility

Assignee

• VEB Polygraph Leipzig, Kombinat fur Polygraphische Maschinen und Ausrustungen · DE

Inventors

• Rudi Riedl · Leipzig, DE
• Regina Jungnickel
• Rainer Nitsch · Leipzig, DE
• Werner Lein
• Lothar Vetter
• Helmut Schone · Radebeul, DE
• Gunter Weisbach · Radebeul, DE
• Hans Johne · Radebeul, DE
• Alfred Schott · Radebeul, DE
• Karl-Heinz Forster · Dresden, DE
• Albrecht Johne · Dresden, DE

Key dates

• Filing date: Mar 13, 1975
• Grant date: Jun 29, 1976
• Expiry date: Mar 13, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H7/12
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A printing machine receives single sheets which are removed from a stack by the suction cups of a feeding mechanism which is combined with a monitoring unit serving to detect the absence of sheets at the undersides of suction cups or the lifting of two or more sheets. The monitoring unit employs a transducer having two feelers which determine the thickness of lifted sheet material and an indicating device which is actuated by the feelers and produces signals serving to indicate the absence of sheets, the lifting of two or more sheets and/or to control the operation of the printing machine. The suction cups can form part of the transducer when the latter is designed to detect only the absence of sheets or they form part of a second transducer which is provided in addition to the first mentioned transducer.