Apparatus for monitoring for faults in translucent strip materia

Details Apparatus for monitoring for faults in translucent strip materia Apparatus for monitoring for faults in translucent strip materia

1980-02-01

1982-01-12

Corbin, John K.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250572, 356444, G01N 2189

Patent

active

043102506

ABSTRACT:
Apparatus for monitoring for faults in translucent strip material, such as photographic film, comprises a transport device 16, 12, 13, 22 for continuously moving the film 11 in its longitudinal direction and an optical scanning device 23 including a beam divider 21 which divides a single series of scanned light beams 14 into first and second sets of scanned light beams 14a 14b. The first set of light beams 14a is used to carry out transmission measurements on the film as it passes in tensioned condition between two spaced apart rollers 12, 13 and the second set 14b is used to carry out measurements in reflection as the film passes around the surface of a roller 16. The roller 16 has an air permeable surface and air is blown through this surface from the inside of the roller to form an air cushion between the film and the roller.
Faults are detected by the electronic processing circuitry 18 in response to variations in the transmission and reflection measurements carried out by the light detectors 15 and 17.

REFERENCES:
patent: 3331963 (1967-07-01), Lippke
patent: 3786265 (1974-01-01), Abilock et al.
patent: 3841761 (1974-10-01), Selgin
patent: 3843890 (1974-10-01), Anthony, Jr. et al.
patent: 4005926 (1977-02-01), Neale et al.
patent: 4110047 (1978-08-01), Takahashi

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