Weft feeler of jet loom

Abstract

The invention relates to a weft detector for an air jet loom, which comprises a weft detecting sensor, preamplifiers, an identification unit and a logic unit; a plurality of identification passages with different identification parameters and passage distributors which are used for controlling electric signals of different weft yarns through the weft detecting sensor and matched with the identification passages with corresponding identification parameters are electrically connected between the output ends of preamplifier and the input end of the identification unit; the number of the identification passages is at least the same as the types of weft yarns used by weaving; the passage distributors are triggered by weft yarn selecting signals provided by the outside to make electrical signals corresponding to different weft yarns enter corresponding identification passages so as to realize weft detection; and the identification passages with different identification parameters are set to different weft yarn signals, so each type of weft yarns can correspond to one identification passage during weaving, thereby obtaining the best identification effect, expanding the adaptability of the air jet loom to different weft yarn varieties, and realizing high-efficiency weft detection.

Description

Technical field [0001] The invention relates to an air jet loom, in particular to a weft detecting device on the air jet loom. Background technique [0002] Air jet looms rely on airflow to insert wefts, and the wefts fly freely under the guidance of the airflow. The weft yarn may produce "weaving defects" such as long weft, short weft, weft bending, and broken weft during the flight. Therefore, a "weft detector" device is needed to detect and prevent the occurrence of "weaving defects". It can be said that "weft detection" is an indispensable part of air jet looms. The basic working principle of the current "weft detecting" device can be summarized as the following process: the sensor detects the weft signal and converts it into an electric signal, and the electric signal is amplified by the amplifier and sent to the identification unit, and the identification unit sends the identification result to the logic unit. The task of the identification unit is to determine whether ther...

AI Technical Summary

Problems solved by technology

But in most cases, the yarns are not one white and one black. There may be many kinds of yarns that belong to white yarns, and there may also be many kinds of yarns that belong to black yarns, but the types of yarns are different, so the reflection of the yarns The signal strength is also different. At this time, you can only adjust the potentiometer to find the appropriate channel gain and "take into account" different yarns. Bad weft detection

[0009] For different types of white yarns and different types of black yarns, the identification unit can only adjust the gain of one channel to correspond to them, so it is inevitable to lose sight of the other, and cannot achieve the best state corresponding to each yarn. This is the limitation of the existing weft detection technology. shortcoming

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