Sheet transfer drum for a printing press

US4852488A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Paul Abendroth · Offenbach am Main, DE
• Josef Mathes · Offenbach, DE
• Roland Holl · Weiterstadt, DE

Key dates

• Filing date: Aug 11, 1982
• Grant date: Aug 1, 1989
• Expiry date: Aug 11, 2002

Classification

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

Abstract

A sheet transfer drum for a recto and verso printing press having a two-piece section device, each piece being mounted on a diagonal slide, the slides being angled in opposite directions, so that the two pieces hold the two corners of the trailing edge of the sheet and stretch the corners in opposite axial directions as well as the circumferential direction of the sheet transfer drum. The stretching of the sheet is synchronized to the rotation of the transfer drum and effected by a control cam cooperating with a cam fixed to the printing press frame. The suction of the suction device is synchronized to rotation of the transfer drum by a commuting air connection between the suction device and a source of suction external to the press frame. The suction device is also adjustably mounted to the shaft of the transfer drum so that sheets of various length may be stretched. The shaft is hollow and encircles concentric control shafts which permit manual operation of internal adjusting and locking mechanisms from outside of the press frame.