Concentric drive mechanism for controlling reciprocal movement of griffe frame blades

In a Jacquard system for forming a shed in a weaving machine which includes two sets of blades for controlling the vertical movement of a plurality of rows of hooks, and wherein the system includes a drive shaft, the improvement comprising,

• an input shaft connected to the drive shaft,
• a single cam mechanism drivingly connected to said input shaft,
• a pair of concentric shafts, each having opposite ends,
• a first means for drivingly connecting an inner of said concentric shafts to said cam mechanism so as to be rotated in a reciprocal motion and a second means for drivingly connecting an outer of said concentric shafts to said cam mechanism so as to be rotated in a reciprocal motion,
• first pairs of radially extending levers carried by and extending from adjacent said opposite ends of said inner of said concentric shafts and second pairs of radially extending levers carried by and extending from adjacent said opposite ends of said outer of said concentric shafts, and
• means for connecting each of said first radially extending levers to a first set of blades and means for connecting each of said second radially extending levers to a second set of blades so that said first and second blades are vertically reciprocated as said first and second pairs of radially extending levers are vertically reciprocated by said concentric shafts.