Register mark detection

Details Register mark detection Register mark detection

G - Physics

08

B

340/123, 341/41

G08B 1/08 (2006.01) B41F 33/00 (2006.01)

Patent

CA 2018337

Apparatus for detecting register marks includes one or more linear arrays of sensore (19, 20) arranged transverse to the direction of relative movement of a web (3) and the apparatus. Where there is more than one linear array (19, 29), they are arranged so that they are substantially non-parallel to allow both longitudiual and transverse monitoring of register marks on the web (3). A signal is generated on detection of a mark and processing means determine the sensor (19) or group of sensors which detected a mark and whether the marks are in register with those of other webs (3).

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