Precision linear measuring suspension system having sliding cont

Details Precision linear measuring suspension system having sliding cont Precision linear measuring suspension system having sliding cont

1991-10-17

1992-12-22

Haroian, Harry N.

Geometrical instruments

Distance measuring

Scale reading position sensor

33558, G01B 702

Patent

active

051724855

ABSTRACT:
In a capacitive-type linear displacement measuring device, a pick-off body is resiliently biased into sliding contact with a scale. The pick-off body is supported by a flat spring and resiliently biased towards the scale by a leaf spring. The front surface of the scale slides in abutting contact with the front surface of the pick-off body. The flat spring restrains non-axial movement of the pick-off body but permits movement normal to the axial movement so that the pick-off body accurately tracks and remains in abutting contact with the scale as it slides in an axial direction. Changes in capacitance caused by axial displacement of the scale are accurately sensed and changes in capacitance caused by non-axial motion are avoided. According to an alternative embodiment, the pick-off body and scale are positioned with their sliding surfaces aligned with the axis of the support member to reduce the moment arm for any friction forces to zero, further reducing the likelihood of inaccurately sensing the axial movement of the scale.

REFERENCES:
patent: 3138714 (1964-06-01), Heidenhain
patent: 4152837 (1979-05-01), Nelle et al.
patent: 4566201 (1986-01-01), Ishii
patent: 4586260 (1986-05-01), Baxter et al.
patent: 4603480 (1986-08-01), Sakagami

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