Printing machine

US4896600A · kind A · utility

Assignee

• Windmöller & Hölscher KG · DE

Inventors

• Dieter Rogge · Lengerich, DE
• Robert Blom · Tecklenburg, DE
• Wolfgang Knapheide · Lienen, DE

Key dates

• Filing date: Dec 9, 1988
• Grant date: Jan 30, 1990
• Expiry date: Dec 9, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F5/24
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A printing machine, such as a flexographic printing machine has a plurality of inking units and a plurality of plate cylinders. A central gear drives an impression cylinder and during a printing operation meshes with plate cylinder gears. The plate cylinders are mounted on plate cylinder carriages on tracks included in the machine frame and which are movable towards the impression cylinder for a printing operation. Halftone ink roller gears are associated with halftone rollers of the inking units and mesh with the plate cylinder gears. The halftone rollers are movable on inking unit carriages on tracks on the plate cylinder carriages. The teeth of the central gear are to be aligned with the teeth of the plate cylinder gears when the latter teeth are moved to pushed-in positions. The plate cylinder gears are provided with datum marks with which sensors fixed to the inking carriage cooperate so that the plate cylinders can be aligned for printing in register. To ensure that an adjustment for printing in register can be effected with high accuracy, without errors and without a need for manual work, each plate cylinder gear is equipped with a servomotor which rotates the plate cylinder…