Incremental measuring system

Details Incremental measuring system Incremental measuring system

1990-01-22

1991-04-16

Cuchlinski, Jr., William A.

Geometrical instruments

Distance measuring

Scale reading position sensor

33707, 33708, 33 1L, 250237G, G01B 702, G01B 1102

Patent

active

050071777

ABSTRACT:
The incremental measuring system comprises a scale member with an incremental scale and a scanning unit comprising scanning sets for generating analog measured-value signals in response to the scanning of the scale. The system also comprises an evaluating unit for deriving digital countable signals from the analog measured-value signals and for generating a reference pulse. At least one pair of reference marks are spaced along the scale on a carrier releasably fixed to the scale member. The scanning unit comprises a reference mark scanning set to scan the reference marks and connected to the evaluating unit. A reference point which registers with a selected increment of the scale is disposed on the carrier between the reference marks of the pair and can be defined by the distances from the reference point to the reference marks, and these distances are stored in a memory. When the reference mark scanning set has scanned one reference mark and has then moved toward the reference point by a distance equal to that of the stored distances, a pulse shaper stage in the evaluating unit will generate a reference pulse when this scanning set scans the reference point.

REFERENCES:
patent: 4229646 (1980-10-01), Burkhardt et al.
patent: 4459750 (1984-07-01), Affa
patent: 4519140 (1985-05-01), Schmitt

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