Rotary offset printing machine system

Details Rotary offset printing machine system Rotary offset printing machine system

1986-03-10

1987-07-21

Fisher, J. Reed

Printing

Rolling contact machines

Rotary

B41F 522

Patent

active

046810358

ABSTRACT:
To compensate for oscillations and bending of a blanket cylinder, and particularly oscillatory behavior under specific operating speeds, underlays between the rubber blanket and the cylinder surface are provided which are of differential thickness, so that, at any given operating speed where the blanket cylinder tends to move away from an associated impression cylinder, the underlay is thickened to thereby maintain essentially uniform printing pressure against the printing substrate (5) under all conditions. The system is equally applicable for plate cylinder - blanket cylinder systems of uniform diameter, as well as for plate cylinder - blanket cylinders of different diameter, and, in the latter case, preferably utilize an underlay blanket which tapers uniformly from a thinner portion to a thicker portion beneath the printed subject matter transferred to the blanket cylinder upon the second revolution of the plate cylinder.

REFERENCES:
patent: 1471895 (1923-10-01), Huebner
patent: 2085845 (1937-07-01), Binkley
patent: 3261289 (1966-07-01), Cash et al.
patent: 3391637 (1968-07-01), Reynolds et al.
patent: 4042743 (1977-08-01), Larson

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