Process and apparatus for drilling holes in the shell of a cylinder

US6789984B1 · kind B1 · utility

Assignees

• Pikoteknik Oy · FI
• Voith Sulzer Papiermaschinen GmbH · DE

Inventors

• Ingmar Vesterlund · Kalajoki, FI
• Georg Kugler · Heidenheim, DE
• Markus Oechsle · Heubach, DE
• Peter Kahl · Gerstetten, DE

Key dates

• Filing date: Jul 12, 1999
• Grant date: Sep 14, 2004
• Expiry date: Jan 19, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T408/5623
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Process and apparatus for drilling holes in a shell of a paper machine cylinder, which is in its operating position. The process includes fixing a drilling apparatus to a cylinder adjacent to the cylinder to be drilled, and substantially eliminating influences of mechanical play due to structures of the adjacent cylinder prior to drilling, which includes coupling a support member to the adjacent cylinder to exert tangential forces on the adjacent cylinder, whereby the mechanical play is substantially eliminated. The apparatus includes a stationary framework supportable on the paper machine, a feed frame that is radially movable along said stationary framework relative to the shell, a drive unit, a plurality of drilling modules coupled to said feed frame, which are rotatable via the drive unit, a fixing device couplable to and adjacent cylinder, a device for eliminating influence of mechanical play due to structures of said adjacent cylinder, and support members adapted to exert tangential forces on said adjacent cylinder.