Shift-over device for controlling the turning drum grippers of a rotary sheet printing press

US4791868A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Kurt Difflipp · Dietzenbach, DE
• Heinrich Ochs · Koblenzer Straße, DE

Key dates

• Filing date: Oct 22, 1987
• Grant date: Dec 20, 1988
• Expiry date: Oct 22, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F21/106
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A shift-over device for controlling the turning drum grippers of a rotary sheet printing press optionally changeable for one-side printing or two-side printing and having a relatively rotatable gripper opening cam and an axially movable gripper turning cam includes a rotatable switching shaft carrying a stop arm with adjustable stops mounted on the press frame for engaging the stop arm and limiting the rotation of the switching shaft in opposite directions. A first crank arm is secured to the switching shaft and carries a lash lever coupled to the gripper opening cam for relatively rotating it incident to oscillations of the switching shaft. A second crank arm is secured to the switching shaft and coupled to a push arm having face cams engageable with push rods connected to the gripper turning cam for axially shifting it incident to oscillations of the switching shaft. In the preferred embodiment, a pneumatic cylinder is connected to a drive crank secured to the switching shaft and a source of pneumatic pressure with a control valve interposed between the source and the pneumatic cylinder is provided for actuating the cylinder to oscillate the switching shaft and simultaneously rot…