Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1984-10-05
1987-08-18
Shoop, Jr., William M.
Communications: electrical
Audible indication
Percussion-type sound producer
250231SE, 250237G, 377 3, G08C 906
Patent
active
046880194
ABSTRACT:
In a measuring instrument for measuring the relative position of two objects, the graduation of a scale as well as a number of identical reference marks absolutely positioned with respect to this graduation and associated code marks are scanned by a scanning unit. The periodic scanning signals obtained in the scanning of this graduation are transferred via first signal lines, and the reference signals obtained in the scanning of the reference marks are transferred over a second signal line to an evaluating arrangement. Code signals obtained in the scanning of the associated code marks by the scanning unit are also transmitted over the second signal line to the evaluating arrangement. The reference signals and the code signals on the second signal line are distinguished from one another by means of AND gates which ensure that the reference signals and the code signals are present on the second signal line only during respective predetermined signal states of the periodic scanning signals.
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Johannes Heidenhain GmbH
Logan Sharon D.
Shoop Jr. William M.
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