Weft monitoring method and weft monitoring device for fluid jet loom

Abstract

The invention discloses a weft monitoring method and a weft monitoring device for a fluid jet loom, and when a supply weft breakage occurs in any weft supply system, a cut weft connected with a weft supply package in the weft supply system where the supply weft breakage occurs is prevented from being twined with wefts of other weft supply systems and brought out. The fluid jet loom includes a weft insertion device including a plurality of weft supply systems, each weft supply system including a weft supply package, a weft measuring-and-storing device, and a weft insertion nozzle. The weft insertion device performs weft insertions by successively using the weft supply systems in turn in accordance with a preset weft insertion pattern. The weft insertion device (60) is such that, when a supply weft breakage occurs in any of the weft supply systems (L), the weft insertion device (60) excludes the weft supply system (L) in which the supply weft breakage has occurred and continues the weft insertion using only the other weft supply system (L) or the other weft supply systems (L). In the fluid jet loom, sensors that detect movements of wefts are provided, each sensor being provided at a location between the weft supply package (1) and the weft measuring-and-storing device (4) in the corresponding weft supply system (L). The weft monitoring method includes the step of outputting a loom stop signal when the sensor detects the movement of the weft in the weft supply system (L) in which the supply weft breakage has occurred.

Description

technical field [0001] The present invention relates to a weft yarn monitoring method and a weft yarn monitoring device for monitoring a weft yarn in a fluid jet loom including a weft yarn insertion device including a plurality of weft yarn supply trains. Background technique [0002] In the fluid jet loom, there is a weft insertion device as disclosed in Patent Document 1, which is equipped with a plurality of weft yarn supply sequences including a yarn supply package, a weft yarn length measuring weft storage device, and a weft insertion nozzle. The set weft insertion mode causes the weft yarn supply sequence to perform weft insertion alternately in sequence, and occurs at the upstream side (hereinafter referred to as "upstream side") of the weft yarn length measuring and storage device in any one of the weft yarn supply sequences in the weft yarn pulling direction. When yarn breakage occurs (supply yarn breakage), the weft yarn supply sequence in which the yarn supply bre...

AI Technical Summary

Problems solved by technology

[0009] However, in the weft insertion devices of Patent Documents 1 and 2, the following problems sometimes occur: as mentioned above, even if the yarn supply breaks in any one of the weft yarn supply sequences, the loom will not stop at this point, but the other weft yarn supply sequences Continue weft insertion, so it will cause the weft yarn connected to the yarn supply package in the weft yarn supply sequence where the yarn breakage occurs to be entangled with the weft yarn of other weft yarn supply sequences that continue to weft insertion, and will be brought out with the weft yarn of other weft yarn supply sequences Weft inserted together

Moreover, if the cut weft yarn becomes the state of weft insertion together with the weft yarns of other weft yarn supply sequences as described above, the weft insertion will be performed in a state different from the original state, and therefore, poor fabric quality will be caused.

[0013] Also, only imagine figure 1 In the case of a plurality of weft yarn supply sequences, if the weft yarn supply sequence arranged on the lowermost side breaks, the above-mentioned problem is considered not to occur, but the same problem may also occur in this case.

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