Printing – Antismut device – Anti-offset material application
Patent
1985-09-03
1987-03-31
Eickholt, E. H.
Printing
Antismut device
Anti-offset material application
83 74, B41C 100
Patent
active
046533990
ABSTRACT:
Piles of sheets (S5) consisting of sheets of security papers (10), which comprise security paper imprints arranged in the form of a matrix, are cut automatically, with step-wise feed, first of all into layers of strips (18) and then into bundles of security papers (19). The lengths of the feed movements of the feed device (26), which moves the piles of sheets forwards step-wise when cutting strips, are controlled by a reading unit (28) provided on the strip-cutting unit (27), respectively on reading an edge mark, which was printed during printing of the sheets in the printing machine (20) by the printing plate on a side edge of the sheet cut off at a later time and orientated parallel to the feed direction of the pile of sheets, when cutting strips. Since these marks provided on the printing plate necessarily follow the expansion of the printing plate increasing in the course of operation, which in particular at the time of die-stamping, is considerable on account of the high contact pressure, an automatic control of the feeds between successive cuts is achieved in this way so that centering of the printed image on the security papers relative to the unprinted edge of the security paper is maintained substantially more accurately than was previously the case, despite increasing expansion of the printing plate.
Instead of being controlled by applied marks, the feed movements may also be controlled by means of a computer on the basis of a program adapted to the increasing expansion of the printing plate or, however, after the passage of a certain number of piles of sheets, may be re-adjusted by hand. The feed control may also be used for cutting bundles, in particular if one works with intermediate cuts.
REFERENCES:
patent: 4361260 (1982-11-01), Hanlan
patent: 4442774 (1984-04-01), Pou et al.
patent: 4478143 (1984-10-01), Hendrischk et al.
patent: 4512256 (1985-04-01), Schriber et al.
patent: 4558615 (1985-12-01), Kuethfuss
De La Rue Giori S. A.
Eickholt E. H.
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