Method and device for switching between single-sided or straight printing mode and perfecting or recto/verso printing mode in a sheet-processing machine and reversing drum having the device

US8042465B2 · kind B2 · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Thomas Schmidt · Heidelberg, DE
• Karl-Heinz Helmstadter · Heidelberg, DE
• Ernst-Christian Maschler · Heidelberg, DE

Key dates

• Filing date: Oct 22, 2007
• Grant date: Oct 25, 2011
• Expiry date: Aug 8, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T70/5611
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A method and a device for converting a mode of operation from straight printing to perfecting in a sheet-processing machine, includes a cam/follower control for operating a gripper system, in which cam followers are maintained in a position in which they are disengaged from control cams before a conversion of the mode of operation is performed. The method and the device convert a gripper system of a reversing drum between a straight or one-sided printing mode and a perfecting or recto-verso printing mode, by controlling pivoting and opening movements of grippers of the gripper system with a control cam. Initially, a cam follower is locked in a position in which it is disengaged from the control cam. Subsequently, a further cam follower is locked in a position in which it is disengaged from a further control cam. Then the gripper system is converted.