Safety device for reacting to a web tear particularly in a rolle

Details Safety device for reacting to a web tear particularly in a rolle Safety device for reacting to a web tear particularly in a rolle

1987-07-29

1988-07-05

Burr, Edgar S.

Printing

Rolling contact machines

Rotary

101225, 101219, 51273, B65H 23188, B65H 1600, B41F 1302

Patent

active

047547022

ABSTRACT:
A safety device which quickly reacts to the occurrence of a tear in a running web processed in a rotary offset printing machine includes a suction roller onto which a web is pressed by a blast of air discharged from a row of nozzles and a pressure-voltage transducer which detects the vacuum in the suction roller and issues a signal to stop the machine or adjust the printing mechanisms in case of the occurrence of the tear in the web.

REFERENCES:
patent: 3721396 (1973-03-01), Morizzo
patent: 4133495 (1979-01-01), Dowd
patent: 4508033 (1985-04-01), Fischer
patent: 4611638 (1986-09-01), Matumura

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