Gantry position tracking using redundant position sensors
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United States of America Patent
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Feb 14, 2012
Grant Date -
Jul 2, 2009
app pub date -
Dec 30, 2008
filing date -
Jan 2, 2008
priority date (Note) -
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Abstract
An x-y robotic motion control system includes a controller, a first rail and a second rail spaced from the first rail wherein the first and second rails are substantially parallel to one another. A gantry has a first end movable along the first rail and a second end movable along the second rail. A payload is movable along the gantry and a position sensor is movable along the gantry with the payload. A first encoder is configured to detect the first end of the gantry with respect to the first rail, and a second encoder is configured to detect the second end of the gantry with respect to the second rail. The position sensor and the first and second encoders are coupled to the controller, which calculates a position of the payload as a function of signals from the position sensor and the first and second encoders.
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