Design and Application of a New Warp Stop Motion by using a Laser Beam

Abstract

This paper presents the first report on design, construction and application of a genuine and new method of warp stop motion using a laser beam .It is based on the phenomenon of light dependant resistance (LDR). The Latter acquires very low resistance in light falls on it and very high resistance in the absence of the light. An electronic circuit was used with two resistances one of them was an LDR. When there is no yarn breakage, the light falls on the LDR, so its resistance becomes very low and the current in the circuit passes through the LDR and back to the source. In the case of yarn breakage the dropper falls crossing the laser beam preventing it from reaching the LDR, so the latter resistance remains very high and the current passes through the other resistance, to the transistor and then to the relay connected to the loom stopping mechanism Ten droppers were dropped by hand, one at a time, simulating yarn breakage and the result was that the loom stopped at the same moment a dropper was crossing the laser beam.