Changeover protection system for perfecting printing machines

US4530283A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

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

Key dates

• Filing date: Apr 27, 1984
• Grant date: Jul 23, 1985
• Expiry date: Apr 27, 2004

Classification

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

Abstract

The turning cylinder and storage cylinder in a perfecting printing press is provided with changeover mechanisms having spring-loaded electromagnetically releasable latches and sensors for detecting latched adjustments. Moreover, a contactless sensor is provided for detecting clamping of the calendering suckers in the storage cylinder even when the cylinder is rotating. Contactless proximity switches determine the correct phase adjustments between the storage cylinder and the turning cylinder for both perfecting and first form printing. An access door and interlock guarantees that the cylinders are turned to a normal position and braked before the access door is opened, and the access door cannot be closed for subsequent printing until changeover has been completed. An indicator array indicates the sequence of adjustments to follow and abnormal conditions.