Method of cut position determination for printing machines

Details Method of cut position determination for printing machines Method of cut position determination for printing machines

1989-02-08

1990-01-30

Eickholt, E. H.

Printing

Processes

Position or alignment

250548, 101227, 101228, 226 28, 226 45, 226 2, B41L 302

Patent

active

048966053

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-keeping marks made on them.

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