Length measuring system

Details Length measuring system Length measuring system

1990-01-22

1991-01-08

Will, Thomas B.

Geometrical instruments

Distance measuring

Error compensation

33706, G01B 704

Patent

active

049825070

ABSTRACT:
The length measuring system comprises a scale member provided with a scale and a scanning unit, which is movable along the scale and is guided by the scale member or by separate tracks, which are parallel to the scale and is coupled to an actuating member by a backlashless coupling. The two coupling elements of the coupling cross each other and are in point contact with each other and having engaging surfaces which are centered on axes which are normal to the longitudinal direction of the scale member. A backlash of the coupling is prevented by a permanent magnetic biasing set, which comprises parts which are respectively connected to the actuating member and to the scanning unit and consist of two permanent magnets or of a permanent magnet and an armature.

REFERENCES:
patent: 3816002 (1974-06-01), Wien
patent: 4149319 (1979-04-01), Nelle
patent: 4165564 (1979-08-01), Burkhardt
patent: 4169316 (1979-10-01), Ernst
patent: 4184262 (1980-01-01), Kolb et al.
patent: 4262423 (1981-04-01), Affa
patent: 4475289 (1984-10-01), Nelle
patent: 4512082 (1985-04-01), Burkhardt
patent: 4569137 (1986-02-01), Ichikawa
patent: 4873770 (1989-10-01), Lutimer et al.
Messen+Prufen/Automatik, Jul./Aug. 1974, pp. 435 to 439.

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