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The tension in the warp yarns is a critical variable in the weaving process. If the warp tension is too high or too low the weaving process will be interrupted. A parameter that directly affects the warp tension is the vertical warp stop motion position. The position of the warp stop motion must be set for every produced new article. The setting procedure is performed completely manual. In this paper we present a mechatronic modification of an air jet-weaving machine to adjust the vertical warp stop motion position with the help of actuators. The parameters for the automated movement are determined and an open loop control, which uses a PLC, is proposed.

In modern weaving industry one of the most frequent facing problems is breakages of warp yams which not only reduce the production rate but also deteriorate the quality of the produced fabric. The main function of the warp stop motion is to stop the weaving process, in a very short period, when a warp yarn breaks. It is very difficult to identify the location and repair the broken warp yarn from several thousand warp yams on single weaving machine. It is one of the largest time consuming and laborious tasks in weaving. Thus by reducing these breakages of warp yarns, there is an increase in the productivity of the processes involved in the production of fabric including warping, sizing etc. The quality of the fabric is also improved. This also reduces yarn wastages and energy, ultimately reducing the cost per meter of the fabric. Also it is possible to minimize the time required for locating the position of broken warp yams on loom with SID (Section Indicating Device) attachment to electrical warp stop mechanism. [ABSTRACT FROM AUTHOR]