Counter-pressure means for effectuating perforations and/or punc

Details Counter-pressure means for effectuating perforations and/or punc Counter-pressure means for effectuating perforations and/or punc

1995-10-11

1997-04-29

Yan, Ren

Printing

Planographic

Rotary machines

101226, B41F 900

Patent

active

056238746

ABSTRACT:
A counter-pressure apparatus for offset sheet machines for effectuating perforations and/or punchings comprises a foil provided with strips at two opposing of its edges. This foil is arranged for being fastened within fixing structure of a rubber blanket cylinder or of a forme cylinder of a printing group or of a coating module of the printing machine. The use of the foil, made e.g. of chronium steel, instead of a prior art rubber blanket results in much better perforations or punching apertures. Further, the printing machine can maintain its usual printing speed.

REFERENCES:
patent: 3926118 (1975-12-01), Preuss
patent: 4178402 (1979-12-01), Klapproth et al.
patent: 4598641 (1986-07-01), Fischer
patent: 4854237 (1989-08-01), Theilacker

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