Electronically controlled sample warper having yarn exchange mechanism high speed warping method and yarn draw-back device

摘要

An electronically controlled sample warper having a yarn exchange mechanism is provided which is capable of extremely reducing yarn looseness possibly occurring during yarn exchange as compared with conventional methods, preventing large variations in yarn tension produced when a yarn is removed to improve the quality of warping and significantly improve the speed of yarn exchange, unlike conventional methods which do produce variations in yarn tension during yarn exchange to cause a degraded quality of warping, and eliminating the need for reducing a warping speed even during yarn exchange to largely reduce a warping time, as compared with the case where a conventional yarn exchange mechanism is used. The electronically controlled sample warper having a yarn exchange mechanism is adapted to automatically exchange yarns and wind the yarns on a warper drum in accordance with a preset yarn order, and comprises one or a plurality of yarn introduction means each rotatably mounted to a side surface of the warper drum for winding a yarn on the warper drum, a plurality of yarn selection guides, arranged in one end portion of a base for supporting the warper drum corresponding to the yarn introduction means, wherein each of the yarn selection guides is pivotally moved to protrude to a yarn exchange position when a yarn is exchanged and pivotally moved to retract to a standby position when a yarn is accommodated, and yarns are passed between the yarn introduction means and the yarn selection guides, and yarn removing guides arranged in one-to-one correspondence to the plurality of yarn selection guides.