SEWING MACHINE AND METHOD FOR DETECTING MOVEMENTS IN SEWING MACHINES
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United States of America Patent
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Issued Date -
Jul 19, 2007
app pub date -
Dec 13, 2006
filing date -
Jan 18, 2006
priority date (Note) -
Abandoned
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Abstract
A sewing machine having a detection device for movements of objects (13) is provided. Here, a coherent light beam (11) is emitted, scattered on the object (13), and returns to form an interference with the emitted light. For movements of the object (13), a frequency shift of the scattered light is produced due to the Doppler effect, which can be detected and evaluated in the form of intensity fluctuations.
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