Wet printing press with throw-off mechanism

Details Wet printing press with throw-off mechanism Wet printing press with throw-off mechanism

1998-06-23

2001-05-08

Funk, Stephen R. (Department: 2854)

Printing

Rolling contact machines

Rotary

C101S143000, C101S247000

Reexamination Certificate

active

06227110

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to printing presses and more specifically to web-fed printing presses.
RELATED TECHNOLOGY
Certain web offset printing presses have a continuous paper web which may be printed on both sides. Typical offset web presses permitting double-sided printing do not permit for printing on one side of the web while a printing plate on the other side of the web is changed.
SUMMARY OF THE INVENTION
The present invention provides an offset printing press for printing a web, the press comprising a frame, a first plate cylinder moveably mounted in the frame and a first blanket cylinder in selective contact with the first plate cylinder. A second blanket cylinder is provided for forming a nip with the first blanket cylinder, the web being able to pass through the nip. A second plate cylinder contacts the second blanket cylinder and also may be moveably mounted in the frame. The press has a first operative condition wherein the first plate cylinder and the first blanket cylinder are in direct contact to permit double-sided printing on the web, a second operative condition wherein the first plate cylinder and the first blanket cylinder are separated to permit a plate change on the first plate cylinder while the web is printed by the second blanket cylinder, and may have a third operative condition wherein the second plate cylinder and the second blanket cylinder are separated while the web is printed by the first blanket cylinder.
The present invention thus advantageously provides an arrangement wherein plate changes may be performed while the web is still being printed on one side. This can reduce downtime and improve productivity of the press.
Advantageously, one of the blanket cylinders also may be movably mounted. In addition, the movably mounted cylinders advantageously can be pivotally mounted in the frame for simple and stable translational movement.


REFERENCES:
patent: 4696229 (1987-09-01), Bezler et al.
patent: 4934265 (1990-06-01), Knauer
patent: 5063844 (1991-11-01), Fausel
patent: 5301609 (1994-04-01), Guaraldi et al.
patent: 5806427 (1998-09-01), Niemiro et al.
patent: 5901648 (1999-05-01), Roland et al.
patent: 6050185 (2000-04-01), Richards
patent: 2216514 (1973-10-01), None
patent: 2 309 668 (1997-06-01), None

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