Longitudinal measuring device

Details Longitudinal measuring device Longitudinal measuring device

1979-03-02

1981-10-20

Punter, William H.

Optics: measuring and testing

By polarized light examination

With light attenuation

33125C, 356375, G01B 1114

Patent

active

042957427

ABSTRACT:
A guiding apparatus for guiding and positioning a scanning unit in a longitudinal measuring device is disclosed wherein the measuring device includes a measuring scale, a driving unit for connecting the device to an object whose position is to be measured, and first and second guide surfaces for guiding the scanning unit along the scale. In the preferred embodiment the guiding apparatus comprises a flexible coupling rod or wire which connects the scanning unit to the driving unit in a flexible manner while maintaining a constant spacing therebetween and first and second springs which bias the scanning unit into contact with the first and second guide surfaces, respectively. Improved guiding and positioning are obtained by separating the coupling function from the guiding function and by using separate springs to bias the scanning unit against the two guide surfaces.

REFERENCES:
patent: 3816003 (1974-06-01), Litke
patent: 4037325 (1977-07-01), Weber et al.
patent: 4063086 (1977-12-01), Hirose
patent: 4070759 (1978-01-01), Nelle
patent: 4149319 (1979-04-01), Nelle
patent: 4152837 (1979-05-01), Nelle et al.
patent: 4169316 (1979-10-01), Ernst

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