Ejection-period setting method for sub-nozzles in air jet loom

Abstract

An ejection-period setting method for sub-nozzles (21) in an air jet loom is provided. The sub-nozzles (21) are divided into groups (1G to 13G) of sub-nozzles (21) that are connected to a common electromagnetic on-off valve (36). The groups (1G to 13G) are divided into downstream and upstream group sets (GU1 and GU3) which each include two or more groups and an intermediate group set (GU2) including the remaining groups. Ejection-amount reducing patterns (patterns hereinafter) are determined and stored in advance in an arbitrarily selectable state, each pattern being determined by setting an ejection-period reducing mode for each of subject group sets in units of predetermined periods so that each pattern includes the ejection-period reducing modes for all of the subject group sets, the subject group sets including the intermediate and upstream group sets (GU2 and GU3). In a process of setting the ejection periods of the sub-nozzles (21), ejection end times of the ejection periods are corrected when a pattern is selected by an operator.

Description

technical field [0001] The present invention relates to a method of setting an injection period (injection start time-injection end time) of a sub-nozzle in an air jet loom. Background technique [0002] In the air-jet loom, a plurality of sub-nozzles arranged along a weft-insertion path perform air injection for a predetermined period to insert weft yarns ejected from the main nozzle. Generally, the plurality of sub-nozzles are arranged in such a way that they are grouped into one group, and the sub-nozzles belonging to the same group are connected to a common on-off valve to spray simultaneously. Such a group is referred to as a "sub-nozzle group" in the present invention. and, if Figure 6 As shown, the injection period is set so that each sub-nozzle group performs alternate injection in sequence from the yarn supply side at the time of weft insertion. [0003] However, when setting the injection period of each of the above-mentioned sub-nozzle groups, it is generally c...

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Problems solved by technology

[0013] However, in the setting method of Patent Document 1, the injection period of the sub-nozzle group close to the yarn supply side cannot be reduced unless the injection period of the sub-nozzle group on the side opposite to the yarn supply side is reduced, so it is not possible to set the nozzle located in the middle of the weft insertion direction. The reduction of the injection period of the sub-nozzle group on the side is greater than the reduction of the injection period of the sub-nozzle group on the reverse yarn supply side

Therefore, the amount of air injection cannot be sufficiently reduced

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