Heidelberger Druckmaschinen Ag

Arno Juenger

Daniel Conzelmann

Wolfgang Dolz

Raimund Schroeder

Andreas Detmers

Thomas Schmidt

Alexander Knabe

Sven Mader

Albert Maul

Christian Meier

Kai Oskar Mueller

Juergen Rothaug

Sven Goll

Juergen Kreutzkaemper

A sheet-transporting drum includes sheet-supporting areas each being formed of a first comb segment and a second comb segment having segment teeth. At least one of the comb segments is rotatable for adaptation to a sheet format. A mechanical leading-edge gripper is provided on the first comb segment and a pneumatic trailing-edge gripper is provided on the second comb segment. A mechanical trailing-edge gripper is additionally disposed on the second comb segment and is deactivatable in particular by format adjustments. This advantageously allows either the trailing edge of a sheet to be securely held down mechanically or a full-bleed print to be applied to the sheet when the trailing edge of the sheet is held down pneumatically. A sheet-fed printing machine is also provided.

Sheet-transporting drum and printing machine having the sheet-transporting drum

A sheet-transport drum includes at least two sheet-supporting surfaces with suction openings. Each respective sheet-supporting surface is formed of first and second comb segments with segment teeth. Suction grooves are provided in the segment teeth and a trailing-edge suction groove is provided in the sheet-supporting surface of each respective second comb segment. A rotary valve is provided for a timed supply of suction air. A plurality of vacuum sources is provided and a trailing-edge suction groove is assigned to each respective vacuum source by the rotary valve. This ensures that the vacuum provided by a respective trailing-edge suction groove at the trailing edge of a respective sheet is reliably maintained even if a previous or following sheet is missing. A sheet-fed printing machine with the sheet-transport drum is also provided.

Sheet-transport drum and printing machine with a sheet-transport drum

A novel, inexpensive and compact printing press is provided, having a central plate cylinder ( ) including at least two printing plates ( ) mounted on the peripheral side, around which are arranged in a satellite configuration at least two blanket cylinders ( ) having assigned inking units ( ), including a transport device ( ), which loops around the blanket cylinder ( ) on the outside, in the manner of a closed, continuous belt, having printing sheets, which are pressed for the printing operation by compensating rollers ( ) against blanket cylinders ( ), and having a control unit ( ), which engages the particular inking unit ( ) and the blanket cylinder ( ) on the corresponding printing plate ( ) and lifts it off of the other printing plate(s) ( ).

Printing press having a central plate cylinder

Growing community of inventors

Walldorf, Germany

Arno Juenger