Method and apparatus for inspecting high speed converted web

Details Method and apparatus for inspecting high speed converted web Method and apparatus for inspecting high speed converted web

1987-02-25

1987-12-22

Rosenberger, R. A.

Optics: measuring and testing

Motion stopping

356430, G01P 340

Patent

active

047143401

ABSTRACT:
Printed webs leaving a printing press at speeds above 500 feet per minute are inspected with precision across the full width of the web by a stroboscope method and apparatus. Each repetitive image or design imprinted on the high speed web is rendered stationary relative to the eyes of a viewer at a web inspection station by bright short flashes of light emitted by an elongated xenon flash tube or tubes spanning the web transversely of its path of movement. Filtered light flashes are triggered by an improved strobe circuit which is synchronized with the press at all times and permits an inspector to produce from one to six equally spaced images per press cylinder revolution. Additionally, the system can be used in either an image lock mode for side-by-side comparison with a standard or in a controlled pan or scroll mode to allow optimal inspection of entire impression sequences. Also, when desirable, both sides of the web can be inspected by utilizing a second flash tube configuration located behind the web.

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