Printing unit for a printing machine
US6631680B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Aug 14, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1605
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A printing unit (1) for a printing machine, having an image cylinder (2), an image generating device (3) for setting an image on the peripheral surface (4) of the image cylinder (2), and an image transfer cylinder (5) which transfers the image from the image cylinder (2) to a printing substrate (6), the image transfer cylinder (5) having a resilient cover (7) which exhibits a deformation (10, 10′) in the force transmission areas (8, 9), and a transport belt (11) that carries the printing substrates (6) and is supported by a back-pressure cylinder (12) driving the image transfer cylinder (5) and the latter driving the image cylinder (2), by friction. The printing unit has a continuous image cylinder speed (v(ü)). This is achieved by the back-pressure cylinder (12) being mounted such that it can be displaced with respect to the image transfer cylinder (5) with a travel-dependent pressing force (F(s)) which is dimensioned such that the speed of the image cylinder (2) remains constant with respect to changes in the effective radius (r) for driving the image transfer cylinder (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.