Geometrical instruments – Area integrators – Electrical
Patent
1984-02-27
1985-08-06
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
G01B 728
Patent
active
045327157
ABSTRACT:
The inspection or measuring machine is suitable for measuring the circular pitch spacing of teeth on gears of large diameter since the measurement results are not negatively influenced by the finite resolution of the graduations of the angular displacement sensing means. The signal pulses .phi..sub.i delivered by the angular displacement sensing means are input into a control processor together with a value r.sub.i of the current measuring radius delivered by a linear displacement measuring system. The control processor computes a corresponding arc-length b therefrom. The path distance T.sub.s (X) corresponding to the deflection of the measurement sensing feeler is measured from the beginning of a linear region of response of the measurement sensing means as recognized by a range comparator. A logic gate initiates the computation of the true arc-length B on the measurement-circle from the calculated arc-length b and the measured path length T.sub.s at a subsequent pulse of the angular displacement sensing means and further computes therefrom the pitch spacing of the gear.
REFERENCES:
patent: 4297788 (1981-11-01), Sterki et al.
Haroian Harry N.
Kleeman Werner W.
Maag Gear-Wheel & Machine Company Ltd.
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