Device for automatic engagement of printing sets under pressure

Printing – Multicolor – Rotary machines

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Details

101145, 271186, B41F 516

Patent

active

044548117

ABSTRACT:
The present invention relates to printing machines with paper reversers.
The purpose of the invention is to mitigate the necessity of adjusting or checking the correct position of paper in the paper reverser.
The above purpose is achieved by the present invention where a paper feeding scanner, together with a scanner for checking the angle of displacement of the machine cylinders are connected, via a first coincidence gate, to the input of a first memory. The output of the first memory is connected to the serial input of a first shift register. To the clock pulse input of the first shift register is connected a pulse scanner for scanning pulses which are synchronous with the revolutions of the printing machine parts upstream of the paper reverser. To the first used storage location of the first shift register is connected a first circuit for engaging printing sets under pressure. The second used storage locations of the first shift register, which coincide with the position of the paper reverser within the system of the printing machine printing sets and transfer drums are connected to the serial input of a second shift register. The clock pulse input of the second shift register is connected to a pulse sensor for sensing pulses synchronous with the revolutions of the machine parts downstream of the paper reverser. To the storage locations of the second shift register, which correspond to the number of revolutions since the inlet of the paper sheet, a second circuit for engaging the printing sets under pressure is connected.

REFERENCES:
patent: 3624359 (1971-11-01), Roote
patent: 3701464 (1972-10-01), Crum
patent: 4116125 (1978-09-01), Forster et al.
patent: 4264957 (1981-04-01), Pautzke
patent: 4385756 (1983-05-01), Beery

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