Device for the precise transverse positioning for a member...

Details Device for the precise transverse positioning for a member... Device for the precise transverse positioning for a member...

G - Physics

05

D

341/97

G05D 3/14 (2006.01) B61K 9/10 (2006.01) G01N 29/22 (2006.01)

Patent

CA 2000550

- 15 - ABSTRACT OF THE DISCLOSURE The invention relates to a method for positioning with precision a member displaced along a rail transversely with respect to the symetry axis of the head of said rail. According to this method, one emits through the head of the rail two ultrasound beams which are prati- cally perpendicular to the fishing plates of this rail. One receives the echoes of these beams reflected by the fishing plates. One forms a regulation or adjusting sig- nal which is function of the time difference between the emission and the reception of its echoe for each said two ultrasound beams and uses this regulating signal to elaborate a control signal for the transverse position- ing of the said member.

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