Method and apparatus for reproducing a reference position in an incremental measuring device
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United States of America Patent
Stats
-
Jul 23, 1985
Grant Date -
N/A
app pub date -
Mar 20, 1984
filing date -
Mar 26, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A calibration process and apparatus are disclosed for allowing a reference position to be determined at any time, independent of the momentary position of the two objects movable relative to one another to be measured. One of the two objects to be measured is decoupled from the measuring device and then either the scanning plate or the measuring graduation of the measuring device is moved until it comes into alignment with a reference mark. This scanning of a reference mark causes a counter included in the measuring system to be set at a predetermined value such as zero. From this point up to the point the scanning plate or measuring graduation is returned to the momentary starting position, the grid lines of the graduation on the graduated plate are counted. In this way, the absolute position of the momentary starting position is determined. After all components of the measuring device have been returned to the momentary starting position, the measuring position is re-established, and the working operation can be resumed.
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