Web tensioning device for printing press

Details Web tensioning device for printing press Web tensioning device for printing press

1988-11-10

1991-04-30

Crowder, Clifford D.

Printing

Rolling contact machines

Rotary

101232, 226143, 226195, 400618, B41F 1302, B65H 2012

Patent

active

050108166

ABSTRACT:
A printing press of a type that will operate with a continuous web has a device for taking up slack between the printing of each format. An electrically actuated sprocket drive is located at the opposite region for pulling the web forward from a blanket cylinder and press cylinder. A tube locates below the web in the input region. The tube has apertures and is connected to a continuous source of vacuum. The vacuum applies a force to cause the web to adhere to the tube. A web tightener will move the tube when pressure between the press and blanket cylinders releases. As the tube reaches the end of the web tightening position, the web tightener will expose a portion of the apertures to the atmosphere, bleeding off the vacuum.

REFERENCES:
patent: 2927789 (1960-03-01), Walsh et al.
patent: 3548747 (1970-12-01), D'Amato
patent: 4742772 (1988-05-01), Grose
patent: 4747347 (1988-05-01), McAnelly
patent: 4751879 (1988-06-01), Van Pelt
patent: 4775087 (1988-10-01), Moser et al.
patent: 4815376 (1989-03-01), Sarda

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