Doctor blade drive

US4515078A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Kurt Difflipp · Dietzenbach, DE
• Johannes Wanke · Offenbach am Main, DE

Key dates

• Filing date: Jun 2, 1983
• Grant date: May 7, 1985
• Expiry date: Jun 2, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S101/38
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

An arrangement for longitudinally oscillating a doctor blade relative to the form cylinder in a printing press. The arrangement includes a double armed rocker having one arm coupled to the doctor blade and the other arm coupled to a hydraulic cylinder. The rocker is mounted on a central eccentric portion of a pivot shaft through a one way idler bearing and the pivot shaft is rotatably supported in a counteracting one way idler bearing. By oscillating the rocker, through sequential operation of the double acting cylinder, the pivot axis of the rocker is continuously displaced, causing the points of reversal of doctor blade movement to be continuously varied independently of the press operation, while maintaining a uniform stroke. In the illustrated embodiment, a pneumatic control is provided for controlling operation of the hydraulic cylinder, and thus the rocker arm and doctor blade movement.