Register mark detection apparatus utilizing a first and second l

Details Register mark detection apparatus utilizing a first and second l Register mark detection apparatus utilizing a first and second l

1990-05-24

1992-05-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, G01N 2186

Patent

active

051151413

ABSTRACT:
Apparatus for detecting register marks includes one or more linear arrays of sensors (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, 20), they are arranged so that they are substantially non-parallel to allow both longitudinal 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).

REFERENCES:
patent: 2962596 (1960-11-01), Leimer et al.
patent: 3323700 (1967-06-01), Epstein et al.

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