A method for detecting a characteristic of a textile or metal thread fed to an operating machine, by the generation of a light signal impacting the thread to create a shadow on an optical sensor device connected to means for monitoring a characteristic of the thread on the basis of an electrical signal emitted by such sensor device as a function of the shadow generated on said sensor device by the thread itself, the characteristic being a physical characteristic of the thread such as its diameter or a characteristic of the feed of the thread when in movement, such as its speed. The signal may be detected in analog mode or a digital mode, the signal detected in the digital mode providing real time calibration of the signal detected in analog mode to generate an electrical signal used by the monitoring means to monitor the characteristics of the thread.

A method for detecting a characteristic of a textile or metal thread fed to an operating machine, by the generation of a light signal impacting the thread to create a shadow on an optical sensor device connected to means for monitoring a characteristic of the thread on the basis of an electrical signal emitted by such sensor device as a function of the shadow generated on said sensor device by the thread itself, the characteristic being a physical characteristic of the thread such as its diameter or a characteristic of the feed of the thread when in movement, such as its speed. The signal may be detected in analog mode or a digital mode, the signal detected in the digital mode providing real time calibration of the signal detected in analog mode to generate an electrical signal used by the monitoring means to monitor the characteristics of the thread.

The present invention relates to a warping device using a retroreflective yarn and a method for weaving a raw fabric using the same and, more particularly, to a warping device using a retroreflective yarn and a method for weaving a raw fabric using the same, wherein a retroreflective yarn is applied as a warp such that a twisting phenomenon is prevented during weaving, thereby making it possible to acquire a raw fabric with excellent quality. The present invention, described above, provides, as the technical gist, a warping device using a retroreflective yarn and a method for weaving a raw fabric using the same, the warping device comprising: a creel unit having multiple bobbins, around which a yarn is wound, cradled thereon such that the yarn is unwound; an aligning unit for aligning the yarn, which has been unwound from the creel unit, at a predetermined interval; and a winding unit for winding the yarn, which has been aligned by the aligning unit, around a beam, wherein the creel unit comprises a main frame comprising horizontal bars, which are installed vertically at a predetermined interval, and vertical bars, which are installed between the horizontal bars at a predetermined interval, and a cradling frame comprising first cradling bars, which are formed to protrude from the inner side of respective vertical bars, and second cradling bars, which are formed to protrude from the outer side of respective vertical bars; first bobbins, around which a synthetic fiber yarn is wound, are cradled on respective first cradling bars; and second bobbins, around which a retroreflective yarn is wound, are cradled on respective second cradling bars to be perpendicular to the first bobbins.