Clamping device for clamping printing plates on the plate cylinder of a printing machine

US4489653A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Bert Cappel · Mühlheim, DE
• Kurt Difflipp · Dietzenbach, DE
• Helmut Emrich · Offenbach am Main, DE
• Horst Erbach · Hofheim, DE
• Wolfgang Feldt · Grundau, DE
• Klaus Neberle · Heusenstamm, DE
• Heinrich Ochs · Koblenzer Straße, DE

Key dates

• Filing date: Jan 7, 1983
• Grant date: Dec 25, 1984
• Expiry date: Jan 7, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F27/1231
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A clamping device for thin flexible printing plates has a tensioning rail at the trailing wall of a wide longitudinal groove in the plate cylinder. The tensioning unit is mounted for axial and peripheral adjustment on a support of "L" cross-section having a first leg seated with respect to the bottom of the groove and a second leg presenting an upstanding reference surface interposed between the tensioning rail and the trailing wall of the groove. A set of tensioning springs recessed in the tensioning rail bear against the reference surface and apply peripheral tension to the plate. A spring detent latches the tensioning rail temporarily against the reference surface, overcoming the tensioning springs while the trailing edge of the plate is being gripped. The spring detent is mounted upon and movable with the support. Screws having a plurality of selectable holes anchor the support in a series of peripheral positions for accommodation of plates of different length. A plurality of jack screws threaded into the tensioning rail have tips which bear against the reference surface on the support for removing slack from the plate and for tensioning of the plate about the surface of the cy…