Abstract: A method of locating a slit between the dents of the reed of a loom corresponding to a broken warp and to an apparatus for positioning a threading device at a position corresponding to the slit between the dents corresponding to the broken warp. The broken warp or a normal warp in a specific vertically displaced relation with the broken warp is detected by a yarn sensor. The position of a slit between the dents corresponding to the broken warp or that of the normal warp is determined on the basis of the distance traveled by the yarn sensor from its standby position, and a threading device is position corresponding to the slit between the dents corresponding to the broken warp on the basis of the distance traveled by the yarn sensor.

Abstract: A method and apparatus for automatically mending warp yarn selects broken warp yarns from among a group of the warp yarns at the time of breakage of the warp yarn. The spacings between the reed wires of a reed through which the broken warp yarn is passed or the spacings between the adjoining reed wires are then enlarged. A yarn passing member is then positioned at the reed wires through which the broken warp yarn is passed on the basis of the position of the reed wires having large spacings therebetween. The yarn passing member is then inserted into space of the reed wires through which the broken warp yarn is passed. A mending yarn tied to the broken warp yarn is then passed and guided into corresponding reed wires by the yarn passing member. In such a manner, it is possible to then set the loom to be re-started.