Denim Manufacturing - Weaving Processes - Drawing in and Warp Tying

When a new denim style is put on a weaving machine, it is necessary to draw or insert the warp yarns through various elements, including the stop motion devices, weave design control devices, and a filling beat-up device. Each end of yarn must have its own individual drop wire and heddle and be inserted into the correct dent in the reed. This procedure can be done manually or automatically on drawing-in machines. Of course, manual drawing-in is much more time consuming. When the same end count and draw is to follow on a loom with a depleted warp, then a full beam of yarn can be tied to the yarns of the old beam. This can be done by a tying-in machine, which automatically selects an end of yarn from the old beam and ties it to the appropriate end on the new beam.