Method of cut position determination for printing machines
US4896605A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1989 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Feb 8, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/1864
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method of cut position determination for printing machines, wherein in order to ensure a synchronous running of the paper webs (P1-P4) to be folded and cut into newspapers (16) on a printing machine for rotary offset printing or rotary letter press printing, main and secondary registers (5, 7) are controlled in their position by means of servomotors (M1-M4) as a function of actuating signals (S.sub.M1 -S.sub.M4). Above each former-introduction guide roller (10), 4 photocells (11) are arranged equally spaced next to one another, which detect brightness signals (H.sub.A1 -H.sub.D4) from the printed surface of these paper webs at a scanning frequency of 20 khz. These brightness signals are subjected to a Fourier analysis in a microprocessor. The fundamental oscillation is evaluated, the fundamental oscillation with the greatest amplitude being selected from the 4 fundamental oscillations of each paper web. The phase position signal associated with the selected fundamental oscillation is used for calculation of one of the actuating signals (S.sub.M1 -S.sub.M4). Consequently, the cut position of the paper webs (P1-P4) can be determined without socalled register marks or register-keepi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.