Device for measuring thickness of sheet article with magnet and

Details Device for measuring thickness of sheet article with magnet and Device for measuring thickness of sheet article with magnet and

1992-01-16

1994-03-08

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324226, 271265, G01B 710, G01R 3312, B65H 702

Patent

active

052931188

ABSTRACT:
An arrangement for measuring a thickness of a sheet article during a sheet article transportation, especially for measuring the thickness of an X-ray sheet film in an X-ray cassette loading and unloading device, has a magnet carrier arranged in a spring-biased manner on a sheet article transportation path perpendicularly to one side of the transportation path, a permanent magnet arranged on the magnet carrier near the first side of the magnet transportation path, at least one roller body arranged on the magnet carrier rotatably in a transportation direction of the sheet aarticle, a probe carrier fixedly arranged parallel to a second side of the transportation path opposite to the matnet carrier, a Hall probe arranged on the probe carrier opposite to the permanent magnet, at least one roller body arranged on the probe carrier. The probe carrier has a number of the roller bodies which corresponds to a number of the roller bodies on the magnet carrier. The roller bodies of the magnet carrier and the probe carrier rolling over one another in a plane of the transportation path. A control unit evaluates an output signal of the Hall probe.

REFERENCES:
patent: 2537731 (1951-01-01), Angell
patent: 3182301 (1965-05-01), Kolb
patent: 3213542 (1965-10-01), Murtland
patent: 4426784 (1984-01-01), Loftus et al.
patent: 4909499 (1990-03-01), O'Brien et al.

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