Position-reading system with switchable reading units for machin

Details Position-reading system with switchable reading units for machin Position-reading system with switchable reading units for machin

1989-06-30

1990-08-28

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 341 15, 364559, G01B 730, G01P 1300, H03M 100

Patent

active

049528742

ABSTRACT:
The position-reading system for machine-tool parts rotatable through 360.degree. renders possible accurate position determination by using a scale although there is present a measuring gap. This is achieved by the use of two reading units angularly offset at a predetermined angle with respect to one another and by the use of an indicating unit which contains evalution and switch-over means. These evaluation and switch-over means evalute the output signals of the two reading units and switch, on the one hand, one reading unit, upon passage thereat of the measuring gap, to become position-reading inactive and, on the other hand, the other reading unit to become position-reading active, such other reading unit taking over the corresponding momentary position value or reading.

REFERENCES:
patent: 3728565 (1973-04-01), O'Callaghan
patent: 4107601 (1978-08-01), Barmeier, Jr. et al.
patent: 4587485 (1986-05-01), Papiernik
Patent Abstracts of Japan, Band 9, Nr. 109 (P-355) (1832), May 14, 1985.

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