Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1996-01-16
1997-11-04
Font, Frank G.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
356238, G01N 2189
Patent
active
056845987
ABSTRACT:
Process for monitoring a moving yarn sheet by means of a light beam, photodetectors and an electronic analyzer, whereby the yarn sheet is guided via thread guide rods before and after the monitoring site and the shadowing of the light beam caused by an increase in thread thickness is directed perpendicularly to the direction of travel of the yarn sheet for detection by photodetectors, and evaluated and recorded by the electronic analyzer, characterized in that the intensity of a single light beam is detected by at least two photodetectors arranged in series in the direction of travel of the yarn sheet and in that the evaluation by the electronic analyzer is such that a recording only takes place when the shadowing is detected by one or more of said photodetectors following in the direction of travel of the yarn sheet with a time delay corresponding to the running speed of the yarn sheet is disclosed. It is preferred to employ at least four photodetectors of which at least two are situated in series in the direction of travel of the yarn sheet and at least two are arranged one above the other such that at least one photodetector is positioned below the yarn sheet plane and at least one photodetector is positioned above the yarn sheet plane.
REFERENCES:
patent: 3717771 (1973-02-01), Abilock et al.
patent: 3786265 (1974-01-01), Abilock et al.
patent: 4952062 (1990-08-01), Bear, III et al.
patent: 5313692 (1994-05-01), Mizucchi et al.
patent: 5426509 (1995-06-01), Peplinski
Derwent Abstract Info. 1995 for German Patent No. DE4236413C1.
Harke Peter
Louis Hans Willi
Worbs Wolfgang
Akzo Nobel nv
Font Frank G.
Morris Louis A.
Noto Joseph M.
Smith Zandra V.
LandOfFree
Process for monitoring a moving yarn sheet and apparatus for the does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for monitoring a moving yarn sheet and apparatus for the, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for monitoring a moving yarn sheet and apparatus for the will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1837209