Device for and method for detecting a relative movement between two machine parts which are movable relative to one another
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United States of America Patent
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Jul 26, 2005
Grant Date -
Aug 26, 2004
app pub date -
Jan 13, 2004
filing date -
Jan 13, 2003
priority date (Note) -
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Abstract
A device for detecting a relative movement between two machine parts movable relative to one another has a plurality of marking rulers arranged on one of the machine parts one after the other in direction of the relative movement of the machine parts and having increment markings for detecting a distance of a relative movement of the both machine parts, two sensors for sensing of the marking rulers and arranged on the other of the machine parts at the predetermined distance in the direction of relative movement of the machine parts, the sensors sensing the increment markings and each providing a sensing signal; the marking rulers being arranged so that distances between two neighboring ones of the marking rulers being smaller than the predetermined distance between the sensors, an evaluating unit operative for determining an absolute position of the corresponding sensor between two successive increment markings based on a phase position of the sensing signal of the sensors.
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