Bending and twisting apparatus and method for printing machine threading tube

US4757702A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Klaus Theilacker · Friedberg, DE
• Michael Worner · Gräfenberg, DE

Key dates

• Filing date: Jul 8, 1986
• Grant date: Jul 19, 1988
• Expiry date: Jul 8, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B21D11/14
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The guide tube (16) is formed with a longitudinal slit which can be bent about a bending drum (6) of standard construction. In order to additionally introduce a longitudinal or spiral twist, a twisting element can be clamped about the tube, to introduce a twist, manually (FIGS. 1, 2), or upon rotating of the bending drum or disk (FIGS. 7, 8) by a coupled gearing. To retain the slit of the tube in proper dimension and alignment, and prevent deformation of the tube, a counter element with a groove (5) therein matched to the circumference of the tube is provided, and an insert strip (18) is located within the tube, which insert strip preferably has externally projecting portions (18a) for guidance of the strip between the counter element and the bending tube or disk, and a recessed portion (18b) extending within the slit (17) to prevent deformation of the tube and of the slit during twisting and/or bending of the tube.