B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
354/25
B65H 23/02 (2006.01)
Patent
CA 2021163
ABSTRACT Method and product for measuring the displacement of a web (110) within a multi-colour rotary printing press by means of a mark simultaneously printed with each colour and placed so as to run through under photoelectric detectors for generating signals, the result of the combination of which is representative of the lateral displacement. This process comprising: - arranging above the web (110) two laterally adjacent photoelectric detectors (130, 135) with their common edge situated on the centre of the expected passage of a laterally symmetrical mark (120), and - deducing the lateral displacement of the web (110) from the difference between the intensity variation (d1, d2) of the signals (a1, a2) seen by each of the two photoelectric detectors (130, 135) when the marks (120) pass under.
Monney Patrick
Roch Roger H.
Stern Nathan
Bobst S.a.
Monney Patrick
Roch Roger H.
Smart & Biggar
Stern Nathan
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