Rubber blanket cylinder for a rotary offset printing machine

Details Rubber blanket cylinder for a rotary offset printing machine Rubber blanket cylinder for a rotary offset printing machine

1986-02-13

1988-04-19

Burr, Edgar S.

Printing

Rolling contact machines

Rotary

101142, 1014151, B41F 500

Patent

active

047382007

ABSTRACT:
To prevent entirely, or at least largely, loss of contact of a pair of blanket cylinders as they roll off against each other upon passing the respective clamping grooves of the rubber blanket cylinders, the rubber blanket cylinders adjacent the edges of the clamping groove (13,14) are formed with transition zones (15,17; 16,18) which rise above a circle formed by the cylinders, in cross section. The rise (Y) is in accordance with a non-circular mathematical function, and, for a cylinder of, for example, about 20 cm diameter, can be in the order of 0.1 mm. At operating speeds of current rotary offset printing machines, the rubber blankets will hardly lose contact from each other and thus stripping formation, due to oscillations of the blanket cylinders as they roll off against each other, is effectively eliminated.

REFERENCES:
patent: 3395638 (1968-08-01), Kirkus et al.
patent: 3453955 (1969-07-01), Seel et al.
patent: 3453956 (1969-07-01), Ellis et al.
patent: 4332194 (1982-06-01), Gensheimer
patent: 4341157 (1982-07-01), Simeth
patent: 4584942 (1986-04-01), Sauer

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