Abstract: For the problem that yarn breakage can not be found in time during the spinning process, this paper proposes a method to monitor the traveler of the spinning frame, which is following the light reflex rule. The traveler’s rotation causes the change of reflected light intensity, which is received by photosensitive tube and converted into original electrical signal. The original electrical signal becomes square wave signal of being suitable for microcomputer detection after peripheral circuit. Microcomputer software calculates the number of square wave signal, when the statistic is less than the default the traveler is deemed hold-on and yarn breakage occurs. We Spun 18.2 tex cotton yarn with spinning frame-EJM128K and monitor yarn breakage with the proposed system. Taking some stages of the spinning process into consideration and making a series of signal sample of the traveler. The result shows that the proposed system can provide accurate detection and warning for yarn breakage position.

Key words: ring spinning, yarn breakage, photoelectric reflex, ring traveler, on-line detection