Sewing machine and method for detecting movements in sewing machines
AssigneeFritz Gegauf Aktiengesellschaft
InventorMichael Wentkowski
Life of this patent
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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.
Claims10
Sewing machine with a device for detecting movements, comprising at least one light source (1) that emits coherent light, an interference detector allocated to the light source (1), the interference detector is constructed for detecting a measurement parameter that characterizes an interference between reflected light from the light source (1) that is scattered by an object (13) to be detected and the light emitted from the light source (1).
Method for detecting movements in a sewing machine, comprising:
- using one or more light sources (1) to emit coherent light in a direction of an object (13) to be detected,
- detecting scattered light of these light sources (1) that is scattered by the object which then forms an interference with the light of the respective light source (1), wherein, when the object (13) moves, the scattered light undergoes a frequency shift that is dependent on the object movement due to the Doppler effect, and for each of the light sources (1), and
- determining and evaluating a measurement parameter, which changes as a function of the interfering light.
Dependencies are inferred from the claim text.