Ernst Leitz G.m.b.h.

Hans-Dieter Jacoby

Erich Schuster

The angular position of a workpiece relative to a reference direction is determined by means of an optical correlator including an imaging system and an optical grating. The workpiece is imaged on the grating and means are provided for effecting a relative lateral displacement between the image and the grating. Photoelectric receiver means are positioned behind the grating in the direction of light flux for generating electrical signals of which the value depends on the angular position of the workpiece relative to the grating. The correlator is rotatable about its optical axis and the electrical signals are of an extreme value when the workpiece and the grooves of the grating are in alignment. Detecting means are connected to the receiver means for sensing this extreme value.

Method of determining the angular position of a workpiece and apparatus

A sensor for calipering workpieces having one spring parallelogram for Apr. motion in each coordinate axis wherein additional spring means vary the spring constant in at least one of the spring parallelograms. The spring means include two coil springs acting in opposition to one another having between the opposed ends intermediate spring bolts, ball stops between the heads of the bolts and a bending rod with a ball at the end thereof acting on the heads of the bolts to compress the coil springs while being held without play by the ball stops.

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Werdorf, Germany

Hans-Dieter Jacoby