Signal conditioning circuit used for yarn length detection

Abstract

The invention discloses a signal conditioning circuit used for yarn length detection, comprising a numerical control potentiometer control circuit, an operational amplification circuit, a voltage following circuit, a high pass filter circuit and a hysteresis comparator circuit. The numerical control potentiometer control circuit comprises one single-chip microcomputer and one numerical control potentiometer; the operational amplification circuit comprises one operational amplifier, one numerical control potentiometer and two resistors; the voltage following circuit comprises one operational amplifier, one resistor and one single-chip microcomputer; the high pass filter circuit comprises one operational amplifier, four resistors and three capacitors; the hysteresis comparator circuit comprises one operational amplifier and four resistors. The circuit can realize amplifier gain automatic control, overcome yarn length measurement errors caused by environmental change and device aging, increase an environment adaptive capacity, prolong the service life of a device, and has the advantages of stable performance, and easy programming.

Description

Technical field [0001] The invention belongs to the neighborhood of textile electronic technology, and in particular relates to a signal conditioning circuit for detecting the yarn length of a weft feeder, and is mainly used for conditioning the signal of the number of yarn loops released in the electronic weft feeder. Background technique [0002] The weft feeder is one of the key equipment for the weaving machine to complete the weft insertion in the textile industry, and it has an important influence on the quality of the fabric. The electronic weft feeder mainly completes the functions of storing the weft, fixing the length of the weft and balancing the tension. According to the different methods of fixed length weft yarns, electronic weft feeders can be divided into electronic drum-type weft feeders and weft feeders with independent functions. Compared with the former, the latter does not need to be synchronized with the loom, and the infrared photoelectric system can be us...

AI Technical Summary

Problems solved by technology

In the traditional photoelectric detection circuit, the amplifier gain of the signal conditioning circuit of the infrared receiving tube cannot be adjusted automatically, the adaptability to the environment is poor, and the ability to compensate for device aging is poor

The aging of the infrared light-emitting tube reduces the amount of light emitted, and the flying flowers and dust during the loom's working process will cause the zero position drift of the signal, resulting in frequent abnormal weft lengths and short wefts after the weft feeder has been used for a period of time, affecting fabric quality and production efficiency.

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