Apparatus for conversion of a printing press to offset printing
US4756247A · kind A · utility
Inventors
Key dates
| Filing date | Sep 27, 1982 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Sep 27, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F13/40
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and method converts an existing printing press to offset printing. An auxiliary frame and two auxiliary impression cylinders are mounted to the press and existing cylinders are adapted for offset printing. A new web path is defined to the cylinders, through an auxiliary cross brace member. The shafts of auxiliary cylinders are eccentrically mounted dead shafts. The cylinder surface is friction driven by the web. Bearers smooth the movement of the cylinders across the blanket slots. The auxiliary cylinders are maintained on impression by an incompressible fluid for uniform impression and thrown off rapidly by a pressurized gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.