Sheet-fed rotary printing press for printing on both sides of a sheet

US4026209A · kind A · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Arno Wirz · Bammental, DE
• Willi Becker
• Bernhard Maul · Heidelberg, DE

Key dates

• Filing date: Oct 15, 1975
• Grant date: May 31, 1977
• Expiry date: Oct 15, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F21/108
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Sheet-fed rotary printing press for printing on both sides of a sheet includes an assembly of a transfer drum, a storage drum and a sheet turn-over drum, mounted in succession, and located between two printing units, the storage drum having clamping grippers for gripping the leading edge of a sheet being fed from the transfer drum to the storage drum, the turn-over drum having tong grippers for gripping the trailing edge of the sheet at an imaginary straight line connecting the rotary centers of the storage drum and the turn-over drum as the sheet is being transferred from the storage drum to the turn-over drum and as the clamping grippers of the storage drum release the leading edge of the sheet, the tong grippers exerting a weaker clamping force on the sheet than the clamping force exerted by the clamping grippers thereon and, before the tong grippers have gripped the sheet and before the clamping grippers have released the sheet, the distance between the clamping grippers, on the one hand, and the tong grippers, on the other hand, is increased.