Opto-electronic weft yarn detector
AssigneeSulzer Brothers Limited
InventorKlaus P. Zeleny
Life of this patent
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Abstract
The weft yarn detector is used in a weaving machine having pneumatic picking as a stop motion to stop the weaving machine or to operate a warning signal. The detector uses one or more radiation sources to pass radiation across the weft yarn path onto radiation detectors which, in turn, emit signals to a difference amplifier. This amplifier produces signals corresponding to the received patterns of radiation and passes the signals to an evaluator where the signals are compared to a preset value. If the signals do not match or exceed the preset value, the weaving machine is stopped or else a warning signal is produced to indicate a missed pick.
Claims8
An opto-electronic weft yarn detector for a weaving machine having a pneumatic picking mechanism, said weft yarn detector comprising
- a transmitting section having at least one radiation source for directing radiation transversely of a weft yarn picking direction;
- a receiving section having an even number of radiation detectors for receiving radiation from said radiation source and a difference amplifier for producing signals corresponding to the received radiation on said detectors;
- an evaluator for receiving and evaluating the signals produced by said difference amplifier during a given detection time period relative to a preset value;
- and
- switching means for selectively stopping the weaving machine or operating a warning signal to stop the weaving machine, said switching means being connected to said evaluator to receive a switching signal therefrom in response to the evaluated signals falling below said preset value.
An opto-electronic weft yarn detector for a weaving machine having a pneumatic picking mechanism, said weft yarn detector comprising
- a pair of radiation sources, each said source being disposed to direct radiation transversely of a weft yarn picking direction and in a straight line;
- a pair of radiation detectors, each said detector being disposed opposite a respective one of said radiation sources for receiving radiation from said radiation sources;
- a difference amplifier for producing signals corresponding to the received radiation on said detectors;
- an evaluator for receiving and evaluating the signals produced by said difference amplifier during a given detection time period relative to a preset value;
- and
- switching means for selectively stopping the weaving machine or operating a warning signal to stop the weaving machine, said switching means being connected to said evaluator to receive a switching signal therefrom in response to the evaluated signals falling below said preset value.
Dependencies are inferred from the claim text.