Geometrical instruments – Distance measuring – Scale reading position sensor
Patent
1991-09-26
1992-05-26
Will, Thomas B.
Geometrical instruments
Distance measuring
Scale reading position sensor
33707, 250237G, 356374, G01B 1114
Patent
active
051155737
ABSTRACT:
An incremental length measuring system comprises a scale member, which is provided with a measuring scale, a scanning unit having scanning elements for scanning the scale and for generating measured-value signals in response to the scanning of the scale, and an analyzing unit for analyzing the measured-value signals. The scale member comprises a reference track, which is parallel to the measuring scale and provided with a plurality of selectable reference marks associated with respective reference points. The scanning unit comprises a plurality of scanning elements associated with respective ones of the reference marks. A selector switch is provided, which is movable in unison with the scanning unit and is operable by permanent magnet devices, which are associated with any of the reference marks when it has been selected and are contained in a protective housing that contains the scale member and the scanning unit. The selector switch is operable to permit a generation or delivery of a reference pulse in response to the scanning of a reference mark by the scanning unit only when the reference mark has been selected. To facilitate the selection of a desired reference mark, a permanent magnet which is mounted within the protective housing is permanently associated with each selectable reference mark and each of the permanent magnets is selectively movable between an inactive position and an active position, in which the permanent magnet is arranged to actuate the selector switch.
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Rieder Heinz
Schwaiger Max
RSF-Elektronic Gesellschaft m.b.H.
Will Thomas B.
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