Abstract: A warp stop motion mechanism for a loom includes droppers adapted to fall under their own weight upon warp yarn breakage, and contact bars for receiving the droppers. The contact bars are held between a pair of upper and lower contact bar supports slidably installed on side frames and a warp yarn breakage detecting circuit is disposed between the upper and lower contact bar supports and adapted to be closed by the natural fall of the droppers.

Abstract: A warp stop motion of the dropper type for automatically stopping the loom associated therewith upon breakage of a warp yarn, including a pair of side frames, each of which doing away with conventional T-shape, is of inverted L-shape comprising a horizontal arm portion for supporting contact bars and separator bars and a vertical arm portion whose upper end joins one end of the horizontal arm portion and whose lower end joins a horizontal shaft. Each side frame has recesses formed in the inner surface thereof for receiving one of the respective ends of the separator bars, and a spring is disposed between one end of each separator bar and the bottom of each recess.