Safety interlock for offset printing press

Details Safety interlock for offset printing press Safety interlock for offset printing press

1978-08-25

1980-11-04

Fisher, J. Reed

Printing

Planographic

Multicolor

101144, 101148, 101175, 101177, 101247, 101352, 101248, B41F 708, B41F 1328, B41F 3130, B41F 740

Patent

active

042312922

ABSTRACT:
A two-color offset printing press having two plate cylinders simultaneously engageable with a single blanket cylinder is disclosed. The plate cylinders and the blanket cylinder are rotatably mounted on a printer head fixed to the mainframe of the press. A first set of dampening and inking rollers is mounted on the printer head and engageable with one of the plate cylinders. A second set of dampening and inking rollers, engageable with the other plate cylinder, is mounted on a ball bushing supported carriage linearly movable to and from the printer head along a pair of parallel rails fixed to the mainframe. Image registry between the two plate cylinders is established by an operator-accessible adjustment mechanism for shifting one of the plate cylinders back and forth along its axis of rotation. An electrical safety interlock system precludes operator access to the carriage-associated plate cylinder during predetermined operating modes of the press.

REFERENCES:
patent: 2676540 (1954-04-01), Faeber
patent: 3041966 (1962-07-01), Polglase, Jr.
patent: 3638568 (1972-02-01), Granger
patent: 4000693 (1977-01-01), Kaiser et al.

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