Wrap detection device

In an apparatus for processing a synthetic yarn that includes a yarn treatment roll having a cylindrical surface, the yarn being conveyed over at least a portion of the surface of the roll, the improvement comprising:

• a sensor comprising a detector component, a communication link, and a control component, the sensor arranged for generating a signal representative of a circumferential wrap accumulation of yarn on the surface of the roll;
• the detector component arranged over a second portion of the roll circumferentially spaced from said portion conveying said yarn, the second roll portion being in a heated, electrically noisy environment;
• the control component comprising an infrared transmitter and infrared receiver disposed in a location remote from the heated, electrically noisy environment of the roll, the transmitter and the receiver each being coupled via said communication link comprising a respective fiber optic link to direct infrared energy toward and to collect infrared energy reflected from the cylindrical surface of the roll, the cylindrical surface of the roll defining a reflector of incident energy from the transmitter;
• the receiver being responsive to the diminution of infrared radiation reflected from the surface of the roll due to the wrap accumulation of yarn on the roll to generate the accumulation signal, the signal representing a predetermined accumulation of wrapped yarn on the surface that facilitates subsequent removal.