Jacquard shed forming device with double tackle assembly

A weaving mechanism adapted to provide three positions of the warp yarns in a weaving loom having a frame wherein the mechanism comprises, a module having a plurality of vertical partitions connected by horizontal elements, at least two adjacent shed-forming devices mounted between a pair of said vertical partitions, each shed-forming device including a pair of hooks which are joined by a first cord and a tackle assembly, knife means for engaging and moving said hooks in reciprocal relationship with respect to one another, each tackle assembly including upper and lower pulleys, said first cord passing partially around said upper pulley of said tackle assemblies, an idler pulley freely rotatably mounted to said horizontal element of said module, a second cord having a first end secured relative to said module and a second end, collar means for attaching said second end of said second cord to a heddle, and said second cord consecutively extending partially around and engaging said lower pulley of said tackle assembly of one of said shed-forming devices, said idler pulley and said lower pulley of said tackle assembly of said other of said shed-forming devices.