Apparatus for the protection of a movable elongate machine part

Details Apparatus for the protection of a movable elongate machine part Apparatus for the protection of a movable elongate machine part

1986-07-08

1987-12-22

Haroian, Harry N.

Geometrical instruments

Gauge

Movable contact probe, per se

33169R, 33172E, 33556, G01B 728

Patent

active

047138920

ABSTRACT:
For protecting an elongate machine part (e.g., the z-quill of a measurement machine) from collision in the course of movement transverse to its longitudinal axis (z), an angularly distributed plurality of directionally responsive ultrasonic transducers is disposed about the quill (4), with their response axes oriented in the direction of the longitudinal axis of the quill. A time-multiplexed echo-ranging operation of some of these transducers is limited to those adjacent transducers which are on an arc that is convex in the instantaneous x-y direction of quill displacement. The sonic-response lobes of the transducers effectively define a protective semicylindrical sonic envelope arranged in front of the quill as it moves in the x-y plane.
If an obstacle enters into the sonic envelope and echo-ranging measurement of the obstacle ordinate z.sub.H is found to be less than the effective extended length of z.sub.P of the quill, then the control computer of the measurement machine, with due consideration of the instantaneous speed of the quill, calculates the place or time as from which the machine must be braked in order to avoid a collision.

REFERENCES:
patent: 4364180 (1982-12-01), Willhelm et al.
patent: 4578873 (1986-04-01), Klingler et al.

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