US 4,630,928 AGranted

Length measuring device

AssigneeMauser-Werke Oberndorf GmbH

InventorsOtto Klingler, Siegfried Gruhler

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Abstract

In a length measuring device with a measuring transducer system, the curve of two sinusoidal test signals is dependent on the longitudinal movement of the measuring transducer system. An interpolation circuit delivers two high-resolution rectangular pulse sequences F1, F2 corresponding to the interpolated sinusoidal voltages and offset by 90.degree., to an evaluating circuit. To achieve a high-resolution at low speeds of travel and a low-resolution at high speeds, two rectangular pulse sequences S1, S2 or G1, G2, offset by 90.degree. and giving a low-resolution, are additionally derived at the interpolation circuit. A control logic circuit 19 monitors the test voltages for attainment of a certain value of the longitudinal movement per unit time or speed of travel. The control logic circuit lets only the low-resolution rectangular pulse sequences through to the evaluating circuit when this value is exceeded, while it lets the high-resolution rectangular pulse sequences with the low-resolution rectangular pulse sequences when this value is not reached.

Claims4

Dependent claims

A device for measuring the length of a movement comprising:

measuring means for generating two mutually offset sinusoidal voltage signals which depend on the movement whose length is to be measured;
interpolation means connected to said measuring means for receiving said voltage signals and for generating therefrom two high resolution rectangular pulse sequences which are offset from each other by 90.degree. and which correspond to an interpolation between said two voltage signals, said interpolation means also generating two low resolution rectangular pulse sequences which are offset with respect to each other by 90.degree. and which correspond to the two voltage signals;
evaluation means connected to said interpolation means for receiving said high and low-resolution pulse sequences and for evaluating a length measurement based on at least one of said pulse sequences;
monitor means connected to said measuring means for receiving said voltage signals and for generating a speed related signal which corresponds to a speed of the movement to be measured;
and
control logic means connected to said monitor means for receiving said speed related signal and being connected to said evaluation means for blocking the use of said high resolution pulse sequences when said speed related signal indicates a speed above a selected value, and for including said high resolution pulse sequences and said low resolution pulse sequences for evaluation of the length when said speed relates signal indicates a speed below said value.

3 more elements

Dependencies are inferred from the claim text.