Device for measuring thickness of sheet article with magnet and probe carriers provided with rollers

US5293118A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Guido Grossmann · Munich, DE
• Hans-Joachim Reuter · Neufahrn, DE
• Werner Nitsche · Lippstadt, DE

Key dates

• Filing date: Jan 16, 1992
• Grant date: Mar 8, 1994
• Expiry date: Jan 16, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B7/107
• WIPO field: Measurement
• WIPO sector: Instruments

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.