Dr. Johannes Heidenhain Gmbh

Pascal Haible

Johann Mitterreiter

Sebastian Gruber

Alois Bartlechner

Jens Dormann

A position-measuring device includes a carrier body having a first and second measuring graduations and a reference mark. The first and second measuring graduations include graduation structures periodically arranged along first and second measurement directions, respectively, that are perpendicular to each other. The graduation structures of the first measuring graduation each extend parallel to a first direction and the reference mark extends in a second direction that forms an angle different from 0° with the first direction. First and second scanners are configured to scan the first and second measuring graduations and generate first and second scanning signals, respectively. A third scanner is configured to scan the reference mark and generate a reference pulse. The position-measuring device is configured such that a phase angle of the reference pulse is determined as a function of the first scanning signals and the reference pulse.

Position measuring device

An annular body has an angle scale for measuring the rotational position of a machine part about an axis, the body having recesses and projections on its inner circumference, and at least one of the recesses being suited for a form-locking rotatably fixed attachment on the machine part. The sum of the central angles, which are respectively defined by starting points and end points of the projections is smaller than the sum of the central angles, which are respectively defined by the starting points and end points of the recesses. Such a body on a high-speed shaft of a machine tool may be used for measuring the rotational position of the shaft.

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Trostberg, Germany

Pascal Haible