Length measuring device

Details Length measuring device Length measuring device

1977-07-13

1979-05-08

Phillips, Charles E.

Geometrical instruments

Area integrators

Electrical

356374, G01B 1104

Patent

active

041528379

ABSTRACT:
A displacement measuring system for measuring relative displacements between two members. The second member is free to move relative to the first member along a main guide. The first member has a scale element which tracks the main guide. The second member is coupled to a scanner which moves along its own guide (which may be constituted by the scale element itself) scanning the scale element to provide a measure of the relative displacement. The coupling is flexible in directions at right angles to the direction of relative displacement in order to compensate for tracking errors between the main guide and the scale.
An embodiment in which the scale is located off the neutral axis of the scale element the coupling is flexible in a first plane on the level of the neutral axis and in a second plane which includes the longitudinal central axis of the scale and is at right angles to the first plane.

REFERENCES:
patent: 2886717 (1959-05-01), Williamson et al.
patent: 3579836 (1971-05-01), Kraus
patent: 3816002 (1974-06-01), Weig
patent: 3816003 (1974-06-01), Litke
patent: 3867037 (1975-02-01), Litke
patent: 3899255 (1975-08-01), Meier

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