Reverse weft finding control method for weaving machine

Abstract

The invention discloses a reverse weft finding control method for a weaving machine, belonging to the technical field of weaving machine control. According to the method, software program is combined with a mechanical structure; control system software controls the number of openings which are correspondingly formed by reversely finding a weft each time according to a weft finding weft instruction, an opening pointer is built to correspondingly point at the corresponding weft number, an electromagnet which participates the control of an electronic dobby shedding mechanism is determined, and an opening pointer program with a dobby shedding cycle pointer mathematic model is operated; driving of the electronic dobby shedding mechanism is achieved to form a previous weft opening of reversely found final target weft through operation of the dobby shedding cycle pointer mathematic model; the pointing direction of the opening pointer firstly retreats back to at least one previous weft from the next weft of the final target weft, and then the final target weft is implemented in an opening forming process; and an electromagnet participating the control is found out. The defects of large positive and negative operating impact force of a traditional pick finding mode mechanism are avoided; weft finding can be achieved at a normal running speed; and the efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of loom control, and in particular relates to a weft finding control method of a loom which utilizes a software program in combination with a mechanical mechanism to complete the weft finding. Background technique [0002] When the loom is weaving, the palm frame is driven up and down by the dobby shedding mechanism so that the warp yarns form shedding. During the weaving process, it is inevitable that weft breakage or fabric surface defects will occur. It is necessary to remove the weft yarn of the target weft where the weft breakage or fabric surface defects occur, and re-insert the weft at the target weft opening for weaving. When the weft break signal or the fabric defect is found manually, the current dobby opening state of the loom has surpassed the dobby opening state of the weft where the weft break or defect is located, so it is necessary to find the weft, that is, return to 1 weft or more than 1 we...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of the existing weft finding method of looms that the mechanism is complex and the operation is prone to failure, and to provide a loom reverse weft finding control method with stable operation and simple control by combining software programs with mechanical mechanisms

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