Method of detecting register errors

Details Method of detecting register errors Method of detecting register errors

1991-05-08

1993-09-21

Black, Thomas G.

Boots, shoes, and leggings

364471, 356401, G06F 1546, B65H 2300

Patent

active

052474623

ABSTRACT:
A method of detecting register errors on a printed product includes providing the printed product with register marks respectively having two edges extending with opposite angles obliquely to a web travel direction, passing the printed product through a printing machine, and scanning the register marks opto-electrically with sensors which may have at least four sensor elements arranged substantially in a square.

REFERENCES:
patent: 4264957 (1981-04-01), Pautzke
patent: 4888717 (1989-12-01), Ditto et al.
patent: 5016182 (1991-05-01), Bergland et al.
patent: 5076163 (1991-12-01), Sainio

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