This invention discloses a beam-based warp breakage detection device and method for
textile looms without stop pins, relating to the field of
textile machinery technology. The device includes a beam emitting unit, a beam receiving unit, and a
signal processing and control module. The beam emitting unit and the beam receiving unit are horizontally opposite each other on the side walls of the loom along its
full width. The beam detection
optical path formed by the two units is horizontally arranged along the left-right width direction of the loom, horizontally penetrating the warp opening section between the warp beam
exit side and the back beam roller and heald frame entry side, completely covering all warp yarns within this section. The vertical height of the
optical path is 50% ± 5% of the height of the warp opening section, and is flush with the center position of the warp opening. This invention breaks through the conventional approach of detecting warp breakage by "detecting the broken warp
yarn itself." Through a pioneering horizontal
optical path installation position, it captures the 3-12mm horizontal displacement
signal of the normal warp
yarn caused by warp
yarn entanglement after a breakage, enabling ultra-
early detection of warp breakage faults within 1-3 seconds. Simultaneously, it completely eliminates the traditional stop-warp structure, preventing warp yarn wear. Verified by a professional
simulation system under full operating conditions, the detection accuracy is no less than 99.44%. This invention fills the industry gap where water-jet looms lack warp breakage detection devices and most air-jet looms lack reliable warp breakage detection solutions, significantly improving weaving production efficiency and fabric quality. It is compatible with all mainstream shuttleless looms and possesses strong industry promotion value.