Method and apparatus for detecting register errors on a printed

Details Method and apparatus for detecting register errors on a printed Method and apparatus for detecting register errors on a printed

1991-05-08

1993-09-28

Black, Thomas G.

Boots, shoes, and leggings

364559, 364471, 356401, G06F 1546, B65H 2300

Patent

active

052491390

ABSTRACT:
A method of detecting register errors on a printed product, includes forming register marks on the printed product, pressing the printed product through a printing machine, opto-electrically scanning the register marks twice in a web travel direction with a predetermined time interval between the scannings, generating respective signals in accordance with the scannings, subtracting the signals from one another to obtain a further signal, and determining the position of the register mark as a measure of a time-dependent position of an extreme value of the further signal; and apparatus for performing the method.

REFERENCES:
patent: 2802666 (1967-08-01), Crosfield
patent: 3609753 (1971-09-01), Albarda
patent: 4135664 (1979-01-01), Resh
patent: 4641070 (1987-02-01), Pfizenmaier et al.
patent: 5076163 (1991-12-01), Sainio

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